Plant data gathering and recording device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a plant data collection / recording device that efficiently records a large amount of plant data transmitted from a plant unit computer and can store the data for a long period of time.

【0002】

[Conventional technology]

For example, in a power plant, a plant data collection / recording device creates a file for each transmission cycle from the unit computer, and the plant data for each instantaneous value is recorded in the file and managed.

【0003】

In addition, not all plant data transmitted from the unit computer is recorded by the plant data collection and recording device, but only for a specific type of plant data in order to save the data size to be recorded. I was recording. Such specific types of data include, for example, water treatment, wastewater treatment environment-related data, start / stop record data, thermal stress-related data at start / stop, turbine vibration, rotation speed, temperature data, and start / stop data. Water quality data, auxiliary equipment monitoring data, and boiler fluid temperature data can be mentioned.

【0004】

The plant data collection timing is from ventilation to reaching 3000 RPM for turbine vibration and rotation speed, and 15, 30, 50, 75, 100% for auxiliary equipment monitoring data, 30 minutes after load setting. Met.

【0005】

[Problems to be Solved by the Invention]

The conventional plant data collection / recording device has the following problems. (1) In order to reduce the recording size of a large amount of plant data transmitted from the unit computer, if the data is recorded only at a specific point, the other points will not be recorded at all. It is not possible to carry out a detailed investigation when investigating the aging of the plant and the deterioration status of the plant using the recorded data of.

【0006】

(2) When searching for a specific point in chronological order from a certain point in the past to the present, if the data is managed in cross section as in the past, the recorded files are frequently referenced. As a result, the search speed is reduced.

【0007】

(3) Since the collection cycle of plant data was fixed, data with almost the same value will be recorded if the data with little fluctuation in value, such as contact system data and analog constant data, is recorded in a 1-minute cycle. , Brings a decrease in recording efficiency.

【0008】

(4) Regarding the collection timing, each event includes a 30-second cycle from plant stop to disconnection, ignition to start-up completion, disconnection to stop completion, start-up start to ignition in 5 minutes, and other events in 1 hour. It is difficult to change the collection timing accordingly, and detailed recording is not possible.

【0009】

The present invention has been made in response to such a point, and is a plant data collection / recording device capable of efficiently and long-term storage of plant data sent from a plant unit computer according to its characteristics. The purpose is to provide.

【0010】

[Means for solving problems]

In order to achieve the above object, the invention of claim 1 collects plant data from a plant at regular intervals in a plant data collection / recording device that collects plant data indicating the operating state of the plant and records it as operation history data. Process input means to be used, current data storage means to save plant data collected at regular intervals by process input means in data collection temporary storage file in cross-sectional format at each collection time, and cross-section format from data collection temporary storage file The plant data of the above is taken out, edited into time-series data of multiple types of recording cycles for each data item, and saved in the time-series data storage file, respectively. An external storage device recording means that records time-series data of a predetermined recording cycle in an external storage device, and a data search means that retrieves specified operation history data from a time-series data storage file or an external storage device based on a request from an operator. It is characterized by having.

【0011】

In the above configuration, since the format for storing the history data of the plant is a time series from the cross section based on the time, the speed of extracting the time series sequence data generally used for data analysis for a specific item is improved. In addition, it is possible to manage historical data according to the application by classifying and creating high-speed data files, medium-speed data files, and low-speed data files by changing the recording cycle at the time of converting plant data from cross section to time series. At the same time, it is possible to improve the extraction speed of historical data and reduce the capacity of the magnetic disk for storage.

【0012】

The invention of claim 2 is a plant data collection / recording device that collects plant data indicating the operating state of a plant and records it as operation history data, and a plant database that stores plant data collected from the plant for a predetermined period at regular intervals. Maximum / minimum compression value creation means for compressing the plant data for a predetermined period so as to fall within a predetermined reduced numerical range based on the maximum value and the minimum value of the plant data for a predetermined period in the plant database, and the maximum / minimum compression value creation means. It is characterized by having a maximum / minimum compression database for storing data compressed by the minimum compression value creation means.

【0013】

In the above configuration, for example, the maximum value and the minimum value are calculated from the plant database for one day, and the difference between the data before compression and the minimum value divided by the difference between the maximum value and the minimum value is compressed and stored. By multiplying by the maximum integer value that can be represented in the region, it is possible to compress the data to a specified bit width.

【0014】

The invention of claim 3 is a process input means for inputting plant data from a plant at regular intervals and a plant event in a plant data collection / recording device that collects plant data indicating the operation state of the plant and records it as operation history data. Recording that determines the event status of the plant based on the plant event judgment table that stores the judgment conditions, the plant data from the process input means, and the judgment conditions of the plant event in the plant event judgment table, and determines the recording cycle of the plant data. It is characterized by including a condition determination means and a data recording means for recording plant data input by the process input means in an operation history database at a recording cycle determined by the recording condition determination means.

【0015】

In the above configuration, data can be recorded at a recording cycle according to the event of the plant. Then, it becomes possible to record only the data necessary for the analysis of the plant, and the efficiency of data recording can be improved.

【0016】

The invention of claim 4 is a plant data collection / recording device that collects plant data indicating the operating state of a plant and records it as operation history data, and a plant database that stores plant data collected from the plant for a predetermined period at regular intervals. Plant data is extracted from this plant database in the order of collection, the first collection plant data and the second collection plant data are stored in the operation history database, and the third and subsequent collection plant data are already stored in the operation history database. Data thinning means that overwrites the collected plant data with the latest plant data in the operation history database when it is approximately equal to the value extrapolated from the latest and next new plant data at the collection time. It is characterized by having and.

【0017】

In the above configuration, for each plant data, if the current value is substantially equal to the value on the linear function obtained from the previously saved value and the value saved two times before the previous time in the operation history database, the recording of the data is omitted. Plant data that is not recorded can be linearly interpolated from the data values of the two times before and after that, so efficient recording is possible and large-scale plant data can be stored for a long period of time.

【0018】

Further, the invention of claim 5 is a data thinning allowable range in which the data thinning allowable range is calculated based on the difference between the maximum value and the minimum value of the plant data in the plant database for a predetermined period in the plant data collection / recording apparatus having the above configuration. The above data thinning means is provided with a calculation means, and for the third and subsequent collection plant data, it is extrapolated from the latest and next newest plant data already stored in the operation history database at the collection time. When the difference from the value is within the data thinning tolerance calculated by the data thinning tolerance calculation means, the collected plant data is overwritten with the latest plant data in the operation history database, and the difference from the extrapolated value. It is characterized in that when the data deviates from the allowable range of data thinning, it is stored in the operation history database.

【0019】

In the above configuration, the data thinning allowable range for thinning out the data according to the maximum change width of each plant data in a predetermined period is calculated, and the current value is the value on the linear function obtained from the previous saved value and the previous saved value. If the difference is within the allowable range of data thinning, data recording is omitted.

【0020】

Further, the invention of claim 6 includes a data thinning rate storage database for storing a data thinning rate obtained in advance for each input point of plant data in the plant data collection / recording device having the above configuration, and is a data thinning allowable range calculation means. Multiplies the difference between the maximum and minimum values of each input point of the plant data for a predetermined period in the plant database by the data thinning rate of the corresponding input point in the data thinning rate storage database for each plant data of each input point. The feature is to calculate the allowable range of data thinning.

【0021】

In the above configuration, the data thinning rate adapted to each plant data is set, and the data thinning allowance range is obtained from the maximum change width in a predetermined period and the data thinning rate for each plant data, so that detailed recording is performed. Is possible.

【0022】

The invention of claim 7 is a process input means for inputting plant data from a plant at regular intervals in a plant data collection / recording device that collects plant data indicating a plant operation state and records it as operation history data, and this process input. The data recording means that records the plant data input by the means in the operation history database and the plant data received this time by the process input means are from the latest and next newest plant data recorded in the operation history database this time. It is characterized by providing a plant data thinning means for deleting the latest plant data from the operation history database when the value is approximately equal to the value extrapolated at the reception time.

【0023】

According to the invention of claim 8, in the plant data collection / recording apparatus having the above configuration, the thinning tolerance judgment rate storage database for storing the thinning tolerance judgment rate of the plant data at each input point and the latest recorded in the operation history database. Estimated value calculation means that calculates the estimated value of the plant data that is expected to be transmitted from the plant next based on the new plant data, and the latest and next new plant recorded in the operation history database. Data and thinning allowance judgment rate The thinning allowance range is calculated based on the thinning allowance judgment rate of the corresponding input point in the storage database, and the estimated value calculated by the estimated value calculation means and the corresponding received value this time It is characterized in that it is provided with a thinning determination means for requesting the plant data thinning means to delete the latest plant data from the operation history database when the difference between the two is within the allowable thinning range.

【0024】

In the above configuration, the estimated value to be transmitted next is calculated from the past plant data transmitted from each unit computer of the plant. When it is determined that the estimated value and the actually transmitted value are almost equal, the latest data in the past plant data is deleted from the operation history database, and the plant data transmitted this time is used as it is in the operation history database. Record in the database. If it is not determined that the estimated value and the actual value are almost equal, the plant data transmitted this time is recorded without deleting the past plant data. Plant data that is not recorded can be linearly interpolated from the stored data values before and after that, so efficient recording is possible.

【0025】

The invention of claim 9 is a plant data collection / recording device that collects plant data indicating the operation state of the plant and records it as operation history data, a process input means for inputting plant data from the plant at regular intervals, and plant data. The contact data is extracted from the contact database that stores the contact data and the plant data input by the process input means, and is collected this time only when it changes compared to the latest contact data stored in the contact database. It is characterized by being provided with a contact data collection / recording means for recording the contact data of the above in a contact database. In the above configuration, the contact data collection / recording means reads the plant data collected by the process input means, which is transmitted from the unit computer of the plant at regular intervals, and extracts the value of the contact data points. Furthermore, the data value registered last time in the contact database is compared with the data value transmitted this time, and if the values are different, the transmission time and value are registered in the contact database. Also, if the values are compared and they are the same, the next received data is waited without being registered in the contact database.

【0026】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

【0027】

FIG. 1 shows a first embodiment of the plant data collection / recording device of the present invention, in which the plant data collection / recording device 1 in the figure is a process for inputting plant data transmitted from a unit computer of plant P. Input processing means 3, current data storage means 5 for temporary storage processing of plant data, data collection temporary storage file 7 for storing plant data in time unit cross-sectional format, and data collection temporary storage file 7 for cross-section format. Time-series data storage means 9 that edits and saves data to data in a time-series recording format, time-series data storage file 11 that stores time-series data edited by time-series data storage means 9, and time-series data storage The time-series data storage file 11 and the data in the external storage device EM are searched by the external storage device recording means 13 that records the time-series data in the file 11 in the external storage device EM and the search request via the input / output device IO. It is composed of 15 data search means.

【0028】

As shown in FIG. 2, the data collection temporary storage file 7 stores n-item plant data S1 periodically collected by the process input processing means 3 in the data format of the cross-section recording format in the order of collection time, for example, for one day. To do.

【0029】

As shown in FIG. 3, the time-series data storage file 11 contains data of a predetermined recording cycle / period for each data item, for example, 1-minute cycle / 1-month high-speed data, 10-minute cycle / 3-month medium-speed data. , 1 hour cycle / year's worth of low-speed data is stored in a time-series recording format, and the data type and recording cycle / period required for data retrieval are stored.

【0030】

Next, the operation of this embodiment will be described with reference to FIGS. 1 to 4. The plant data from the plant P is read by the process input processing means 3 at a fixed cycle, and is stored in the data collection temporary storage file 7 by the current data storage means 5.

【0031】

In the time-series data storage means 9, the plant data stored in the cross-sectional format when viewed on a time basis is taken out from the data collection temporary storage file 7, converted to the time-series recording format, and then stored in the time-series data storage file 11. To do. At that time, time-series data in the time-series recording format is created in the same cycle as the collection cycle of the cross-section recording format, for example, in a 1-minute recording cycle, and stored in the time-series data storage file 11 as a high-speed data file 11a. Further, depending on the intended use, a medium-speed data file 11b having a slightly long data cycle, for example, a 10-minute recording cycle, or a low-speed data file 11c having a 1-hour recording cycle is created.

【0032】

FIG. 4 shows the processing flow of the time-series data storage means 9. First, the current plant data of n items stored in the cross-section format is extracted from the data collection temporary storage file 7 (step 100), and each item is obtained. Set each in the buffer corresponding to (step 101). Next, it is determined whether or not all the data is set in each buffer (step 102), and if the buffer is full, it is saved in the high-speed data file 11a in the time series format (step 103). In addition, it is determined whether or not the current plant data collection time is the save timing of the medium-speed data file 11b (step 104), and if it is the save timing, the same data is also saved in the medium-speed data file 11b in the time-series format. (Step 105). At the same time, it is determined whether or not it is the save timing of the low-speed data file 11c (step 106), and if it is the save timing, the data is also saved in the low-speed data file 11c in the time-series format (step 107). Along with saving the data in these data files 11, the buffer is cleared and the input buffer is switched (step 108).

【0033】

The relationship between the data recording cycles of the high-speed data file 11a, the medium-speed data file 11b, and the low-speed data file 11c is as follows.<img file="JPH1069498A_D0001.tif" />It looks like this.

【0034】

The high-speed data, medium-speed data, and low-speed data created by the time-series data storage means 9 are spool-stored in the time-series data storage file 11 for a certain period of time. The spool storage amount is determined by the magnetic disk capacity and the purpose of data retrieval. In particular, low-speed data has a smaller data amount than high-speed data, so long-term data can be stored on the magnetic disk. For example, high-speed data for one month, medium-speed data for three months, and low-speed data for one year are stored in spools.

【0035】

The external storage device recording means 13 records the designated data spooled in the time-series data storage file 11 in the external storage device EM for a designated period or when the designated number of data is spooled.

【0036】

The data search means 15 first determines whether the target data exists on the magnetic disk of the time-series data storage file 11 for the plant data search request instructed by the input / output device IO regarding the data item, sampling cycle, and period. If it exists, the time-series data on the magnetic disk having a high access speed is taken out, and if it does not exist, the data is taken out from the external storage device EM such as an optical disk having a relatively low access speed.

【0037】

As is clear from the above description, according to the present embodiment, by changing the plant data from the cross-section format to the time-series format, frequent data retrieval when extracting long-term data is reduced and the speed is increased. Can be planned.

【0038】

In addition, by dividing the time-series format into high-speed data / medium-speed data / low-speed data according to the type of data performed and further determining the spool period for each purpose, it is possible to retrieve data from the magnetic disk even for long-term data retrieval. , The search speed can be increased. Further, it is not necessary to spool high-speed data on the magnetic disk for a long period of time for the purpose of speeding up long-term data search, and the amount of magnetic disk used can be reduced.

【0039】

FIG. 5 shows a second embodiment of the plant data collection / recording apparatus of the present invention, which is stored in the plant database 21 and the plant database 21 for storing the plant data collected from the plant for a predetermined period at regular intervals. The maximum / minimum value calculation means 23 for obtaining the maximum value and the minimum value from the data, the maximum / minimum compression value creation means 25 for compressing the data based on the maximum / minimum value of the data, and the compressed data are stored. It is composed of a maximum / minimum compression database 27 and a maximum / minimum compression data storage means 29 that stores data compressed by the maximum / minimum compression value creation means 25 in the maximum / minimum compression database 27.

【0040】

In the plant database 21, the plant data of each input point for a predetermined period (for example, one day) transmitted from the unit computer of the plant is stored together with the header information. In the plant database 21 shown in FIG. 6, plant data t1 to tn of n input points are stored.

【0041】

The maximum / minimum value calculation means 23 extracts the maximum value and the minimum value from the n uncompressed data in the plant database 21.

【0042】

The maximum / minimum compressed value creating means 25 calculates the compressed value of each data based on the maximum value and the minimum value obtained by the maximum / minimum value calculating means 23.

【0043】

As shown in FIG. 7, the maximum / minimum compression database 27 stores the maximum value and the minimum value together with the header information, and stores n compressed data.

【0044】

Next, the operation of this embodiment will be described with reference to FIGS. 5 to 8. When there is a request for compression processing, the maximum / minimum value calculation means 23 reads n plant data t1 to tn for each input point from the plant database 21 (step 200), and the maximum of these n data. Extract the values MAX and MIN (step 201).

【0045】

Here, if MAX is an invalid value (example: a very large value such as 999999), if the plant data is compressed according to the data compression formula described later based on this invalid value, the compressed data will always be 0. If you decompress the compressed data, all the decompressed data will be the minimum value.

【0046】

To avoid this, check whether MAX is appropriate or not with the formula shown below (step 202).

[Number 1]

(t-MIN) / (MAX-MIN) &lt;1/2^{b b}However, t is any data value of plant data t1 to tn except MIN and MAX, and b is the compressed data size (bits) per data.

【0047】

If this condition is met, it is determined that MAX is invalid, correction processing is performed to set MAX to 0 (step 203), and the maximum and minimum values are calculated again (step 200).

【0048】

Next, using the determined MAX and MIN, the maximum / minimum compressed value creating means 25 calculates the compressed data ti (step 204). That is, the ratio of the difference between the data values ti (i = 1,2, ..., n) and MIN to the difference between MAX and MIN, and the maximum integer value that can be handled within the compressed data size (b bits). Let the product be the compressed data ti and have it as a positive integer value.

【0049】

Here, since ti -MIN MAX-MIN, the compressed data ti always fits within the compressed data size. This can be expressed by an equation as follows.

【0050】

[Number 2]

ti = (ti -MIN) / (MAX-MIN) * 2^{b b}However, ti is arbitrary uncompressed plant data, the data size is a bit, b is the compressed data size (bit), and b &lt;a. Also 2^{b b}Is the maximum integer value that can be handled on the data size b bits, and since (ti -MIN) / (MAX-MIN) &lt;1, always ti 2^{b b}Will be.

【0051】

The compressed data ti is obtained according to the above data compression calculation formula [Equation 2], and this compressed data ti is a decompression formula derived from the above data compression calculation formula as necessary. [Number 3]

ti = ti * (MAX-MIN) / 2^{b b}+ MIN Allows decompression to ti with uncompressed data size.

【0052】

The maximum value MAX and minimum value MIN calculated by the above maximum / minimum value calculation means 23, and the compressed data ti (i = 1,2, ..., n) created by the maximum / minimum compression value creation means 25. The maximum / minimum compression data storage means 29 stores the data in the maximum / minimum compression database 27 (step 205).

【0053】

As is clear from the above description, according to the present embodiment, the ratio of the difference between the data value and the minimum value to the difference between the maximum value and the minimum value and the compression of the plant data for a predetermined period at a certain input point. By using the product of the maximum integer value that can be handled within the data size as the compressed data, the plant data within a predetermined period can always be held within the compressed data size, and the capacity required for recording can be reduced.

【0054】

FIG. 9 shows a third embodiment of the plant data collection / recording apparatus of the present invention, which is a process input processing means 3 for inputting plant data transmitted from a unit computer of plant P, and a determination condition for a plant event. The plant event determination table 31 that stores the data, the recording condition determination means 33 that determines the event status of the plant that is the recording condition based on the plant event determination table 31 for the plant data input by the process input processing means 3, and the process input processing. Data recording means 35 that records the plant data input by means 3 under the recording conditions determined by recording condition determination means 33, and power generation operation history database 37 that stores plant data with different recording cycles according to the event status of the plant. , Consists of input / output device IO.

【0055】

The plant event determination table 31 stores conditional expressions for determining plant event states (load stabilization, disconnection, ignition, etc.) as shown in FIG. 10, and these conditional expressions are passed through the input / output device IO. Is registered / changed.

【0056】

The recording condition determination means 33 determines what kind of event state the plant is in from the plant data input by the process input processing means 3 based on the plant event determination table 31, and prepares an event state and a recording cycle in advance. Determine the recording cycle of plant data from the correspondence table with.

【0057】

The data recording means 35 stores and processes the plant data input to the process input processing means 3 in the power generation operation history database 37 at the recording cycle determined by the recording condition determination means 33.

【0058】

Next, the operation of this embodiment will be described with reference to FIGS. 9 to 11.

【0059】

First, the plant data transmitted from the unit computer of the plant P is input by the process input processing means 3 (step 300). Next, the recording condition determination means 33 determines the event state of the plant, which is the recording condition of the plant data input from the plant P, based on the contents of the plant event determination table 31 registered by the input / output device IO ( Step 301).

【0060】

As a result of this determination, if the event state of the plant is between the start of stop and the disconnection, or between the ignition and the completion of start (step 302), the recording cycle of plant data is set to 30 seconds and is constant to the process input processing means 3. The plant data input in a cycle is recorded in the power generation operation history database 37 in a cycle of 30 seconds by the data recording means 35 (step 303).

【0061】

If the event state of the plant is between disconnection and stop completion, or between start and ignition (step 304), the plant data recording cycle is set to 5 minutes, and the plant data from the process input processing means 3 is used. The data is recorded in the power generation operation history database 37 every 5 minutes by the data recording means 35 (step 305).

【0062】

If the event state of the plant is when the load is stable (step 306), the recording cycle of the plant data is set to 1 hour, and the plant data from the process input processing means 3 is recorded by the data recording means 35 in the power generation operation history in a 1-hour cycle. Record in database 37 (step 307).

【0063】

When the plant state is not in any of the above event states, the recording cycle of the plant data is set to 1 minute, and the plant data from the process input processing means 3 is recorded by the data recording means 35 in a 1-minute cycle of the power generation operation history database 37. Record in (step 308).

【0064】

As is clear from the above description, according to the present embodiment, the recording cycle can be changed according to various event states of the plant, so that the plant data transmitted at a fixed cycle may be recorded as it is. In comparison, recording efficiency is considerably improved because unnecessary data is not recorded, and recording can be performed in a much shorter cycle than the normal recording cycle when the plant is started or stopped. More accurate plant analysis can be performed.

【0065】

FIG. 12 shows a fourth embodiment of the plant data collection / recording apparatus of the present invention, which includes a plant database 21 that stores, for example, one day's worth of plant data collected from a plant for a predetermined period at regular intervals. Maximum / minimum value calculation means 41 for calculating the maximum and minimum values of daily data, maximum / minimum value storage database 43 for storing maximum and minimum values for daily data, and data thinning rate. Data thinning rate storage database 45 to be used, data thinning tolerance calculation means 47 for obtaining the data thinning tolerance using the data thinning rate in the data thinning rate storage database 45, and the plant database based on the calculated data thinning tolerance. To the data thinning means 49 that thins out and extracts the data of one day in 21, the power generation operation history database 51 that stores the data that is thinned out and extracted by the data thinning means 49, and the power generation operation history database 51 by the data thinning means 49. It is composed of the database deletion means 53 that deletes the data for one day to be processed in the plant database 21 after the storage processing of the data is completed.

【0066】

The plant database 21 stores analog data transmitted from the unit computer of the plant.

【0067】

When the daily data is stored in the plant database 21, the maximum / minimum value calculation means 41 extracts the maximum and minimum values of each input point from these data and stores them in the maximum / minimum value storage database 43. save.

【0068】

The data thinning rate storage database 45 stores the data thinning rate obtained in advance for each input point.

【0069】

The data thinning tolerance calculation means 47 sets the daily maximum / minimum value of each input point stored in the maximum / minimum value storage database 43 and the corresponding input set in the data thinning rate storage database 45. The data thinning allowance range of each input point is calculated from the data thinning rate of points. For example, the data thinning allowance range RANGE is calculated from the difference between the daily maximum value MAX and the minimum value MIN and the data thinning rate t (%) at the corresponding input point. [Number 4]

RANGE = (MAX-MIN) /2.0 * t / 100 Is sought after.

【0070】

The data thinning means 49 reads the first and second data in the time order of the plant data of one day from the plant database 21 and stores them in the power generation operation history database 51 together with the relative times 0 and 1.

【0071】

Then, the third data is read, and the difference Δx (this time difference) from the second (relative time = 1) data value stored in the power generation operation history database 51 and the second data value and the first (relative time =) Difference Δx from the data value of 0). (Last difference) is calculated, and this time difference Δx is the previous difference Δx. It is smaller than the value obtained by adding the data thinning allowance range RANGE to, and the difference Δx this time is the difference Δx last time. If it is larger than the value obtained by subtracting the data thinning allowance range RANGE from, the third data is judged to be within the data thinning allowance range and is replaced with the second data in the power generation operation history database 51. Is overwritten with relative time = 2. The difference Δx this time is the difference Δx last time. Is larger than the sum of RANGE and the data thinning allowance range, or the previous difference Δx. If it is smaller than the subtraction value between and the data thinning allowable range RANGE, it is determined that the third data deviates from the data thinning allowable range, and the second data is stored in the power generation operation history database 51 without being erased.

【0072】

Next, for the fourth data, when the third data is stored in the power generation operation history database 51 without overwriting, the difference between the fourth data value and the third data value is the difference Δx, this time. The difference between the third data and the second data is the previous difference Δx. As described above, it is determined whether to add the fourth data to the power generation operation history database 51 as it is and store it, or to overwrite the third data.

【0073】

Also, when the third data is overwritten with the second data in the power generation operation history database 51, the difference between the fourth data value and the third data value is the difference Δx this time and the third data value. The difference from the first data value is the previous difference Δx. As a result, the difference Δx this time is the difference Δx last time. Is greater than the value obtained by adding the data thinning allowance range RANGE to 1/2 of, or the previous difference Δx. If it is smaller than the value obtained by subtracting the data thinning allowance range RANGE from 1/2 of, the fourth data is stored in the power generation operation history database 51.

【0074】

Regarding the i-th data, the difference between the values of the latest data and the data stored in the power generation operation history database 51 is the difference Δx this time, and the difference between the latest data and the next new data is the previous time. Difference Δx. Assuming that the relative time of the latest data is T0 and then the relative time of the new data is T1, the difference Δx this time is as follows. [Number 5]

Δx. / (T0 -T1) -RANGE &lt;Δx &lt;Δx. / (T0 -T1) + RANGE When it is in the range of, the i-th data is overwritten with the latest data in the power generation operation history database 51 with the relative time set to (i-1), and the next (i + 1) -th data is overwritten from the plant database 21. Take it out.

【0075】

The database deletion means 53 deletes the daily plant data in the plant database 21 after the daily data thinning process is completed by the data thinning means 49.

【0076】

Next, the operation of this embodiment will be described with reference to FIGS. 12 and 13. The plant data collection / recording device 1 receives the plant data transmitted from the plant unit computer by means (not shown) and stores it in the plant database 21. At that time, it is determined whether or not the plant data stored in the plant database 21 is daily (step 400), and if it is daily, it is the largest value among the daily plant data stored in the plant database 21. The smallest value is calculated by the maximum / minimum value calculation means 41 and stored in the maximum / minimum value storage database 43 (step 401).

【0077】

Next, the data thinning tolerance calculation means 47 extracts the maximum value and the minimum value of the plant data for one day from the maximum value / minimum value storage database 43, calculates the difference (step 402), and calculates the data thinning rate storage database. The data thinning allowance is calculated using the data thinning rate data set in 45 (step 403).

【0078】

The data thinning means 49 extracts data from the plant database 21 (step 404), determines whether or not the number of recorded daily plant data in the power generation operation history database 51 is 2 or more (step 405), and determines whether or not the number of data is recorded in the plant database 21 (step 405). If there is no more, or even if there are two or more recorded data, it is determined whether or not the difference between the extracted data and the value extrapolated from the latest and next new recorded data is within the data thinning allowable range (step). 406) When the data deviates from the allowable range of data thinning, the data is stored in the power generation operation history database 51 (step 407). If this stored data is not the last data of the day, the next data is fetched from the plant database 21 (step 404), and when the data thinning recording for one day is completed, the database deletion means 53 is used to retrieve the plant database 21. Is deleted (step 408), and the termination process is performed.

【0079】

On the other hand, if the difference between the data extracted in step 406 and the value extrapolated from the latest and next new recorded data is within the data thinning allowable range, this extracted data is used as the latest data in the power generation operation history database 51. Overwrite (step 409) and retrieve the next data from plant database 21 (step 404) if it is not the last data of the day.

【0080】

As is clear from the above description, according to the present embodiment, for example, a large amount of plant data transmitted from the control unit computer at a 1-minute cycle is thinned out by the difference between the maximum value and the minimum value in a day. By thinning out based on the data thinning allowance range obtained by the rate, it is possible to minimize the data recording size, and it is possible to record data for a long period of time.

【0081】

Also, with regard to the thinned data, it is possible to acquire two data before and after the thinning, calculate the l-order formula from the data of the two points, and linearly interpolate from the linear formula.

【0082】

In the present embodiment, the data thinning process is performed for each day's worth of data, but the present invention is not limited to this, and an arbitrary period may be set and the data thinning process may be performed for each period.

【0083】

FIG. 14 shows a fifth embodiment of the plant data collection / recording apparatus of the present invention, in which process input processing means 3 for inputting plant data transmitted from a unit computer of a plant and power generation for storing plant data. Estimated value calculation means 63 for calculating the estimated value of the next plant data using the plant data in the operation history database 61 and the power generation operation history database 61, and the estimated value storage database 65 for storing the calculated plant data estimated value. And the difference between the plant data estimated value in the thinning tolerance judgment rate storage database 67 and the estimated value storage database 65 and the input value input by the process input processing means 3 and the thinning tolerance judgment A plant that thins out the plant data in the power generation operation history database 61 based on the judgment result of the thinning judgment means 69 and the thinning judgment means 69 that judge the data thinning based on the thinning allowable range judgment rate in the rate storage database 67. It is composed of a data thinning means 71 and a data recording means 73 that records the plant data input by the process input processing means 3 in the power generation operation history database 61.

【0084】

In the power generation operation history database 61, the plant data input by the process input processing means 3 is recorded by the data recording means 73. When this plant data is recorded, if the difference between this plant data and the estimated value calculated based on the past plant data stored in the power generation operation history database 61 is within the thinning allowable range, the power generation operation history database The latest data from the past plant data stored in 61 is deleted by the plant data thinning means 71.

【0085】

The estimated value calculation means 63 calculates the estimated value of the plant data that is considered to be transmitted next when the plant data is stored in the power generation operation history database 61 and two or more points of data are recorded for one input point. To do.

【0086】

For example, when the relative time T of the data transmission time is t1, t2, t3, ... and the value of the plant data Y corresponding to the time is y1, y2, y3 ..., it is the second in the past data. Let the new data be (t1, y1) and the latest data be (t2, y2). Here, assuming that the relative time of the transmission time of the data to be transmitted next is t3 and the estimated value of the plant data Y is y3 , the estimated value y3 is given by the following equation. [Number 6]

y3 = (y2 -y1) * (t3 -t2) / (t2 -t1) + y2 Is calculated by.

【0087】

The estimated value calculating means 63 stores the estimated value calculated in this way in the estimated value storage database 65 for each input point.

【0088】

The thinning allowance judgment rate storage database 67 stores the thinning allowance judgment rate determined in advance for each input point.

【0089】

The thinning determination means 69 compares the value y3 of the plant data Y at the transmission time t3 input to the process input processing means 3 with the estimated value y3 stored in the estimated value storage database 65, and stores the thinning allowable range determination rate. The thinning is judged based on the thinning allowance judgment rate of the corresponding input points stored in the database 67.

【0090】

For example, if the decimation tolerance judgment rate of plant data Y is m (%) and the number of data transmissions (including y1 and y2) between transmission times t1 and t2 is N, the input value y3 is the condition of the following equation. [Number 7]

| y3 -y3 | {| y2 -y1 | / (N-1)} * m / 100 Is determined whether or not the above is satisfied.

【0091】

The plant data thinning means 71 receives the judgment result of the thinning judgment means 69, and when the difference between the input value y3 and the estimated value y3 is within the above thinning allowable range, the latest data (t2, t2, from the power generation operation history database 61) If y2) is deleted and the decimation tolerance is exceeded, the latest data (t2, y2) will not be deleted.

【0092】

The data recording means 73 stores the plant data input by the process input processing means 3 together with the transmission time in the power generation operation history database 61.

【0093】

Next, the operation of this embodiment will be described with reference to FIGS. 14 and 15. When two or more points of data are recorded in the power generation operation history database 61, the latest data and the second newest data are fetched from the power generation operation history database 61 by the estimation value calculation means 63 (step 500), and then transmitted. The estimated value that seems to be calculated is calculated according to the equation [Equation 6] (step 501), and the estimated value is stored in the estimated value storage database 65.

【0094】

Then, when the plant data transmitted from the unit computer is input by the process input processing means 3 (step 502), the thinning determination means 69 compares the input value with the estimated value in the estimated value storage database 65, and the difference is It is determined whether or not it is within the thinning allowance range obtained on the right side of the inequality of [Equation 7] (step 503). When the difference is within the allowable thinning range, the plant data thinning means 71 deletes the latest data used in the calculation of the estimated value from the power generation operation history database 61 (step 504). At the same time, the plant data input by the process input processing means 3 is recorded in the power generation operation history database 61 by the data recording means 73 (step 505). If the difference is not within the allowable range of thinning, or if the power generation operation history database 61 does not contain two or more points of data, the data recording means 73 without deleting the data from the power generation operation history database 61. The plant data received this time is recorded in the power generation operation history database 61.

【0095】

As is clear from the above description, according to the present embodiment, when the data transmitted from each unit computer changes linearly, the recording size of the data can be suppressed to a small size. In particular, the operation data of the plant has almost no fluctuation during steady operation or during the shutdown of the plant, and tends to change almost linearly even when there is a fluctuation. By using the recording method, it is possible to thin out a considerable amount of data.

【0096】

FIG. 16 shows a sixth embodiment of the plant data collection / recording apparatus of the present invention, in which a process input processing means 3 for inputting plant data transmitted from a unit computer of plant P and contact data are stored. It is composed of a contact database 81 and a contact data collection / recording means 83 to be recorded in the contact database 81 when the contact data input by the process input processing means 3 is different from the previous time.

【0097】

Next, the operation of this embodiment will be described with reference to FIGS. 16 to 19. The process input processing means 3 inputs the plant data transmitted from the unit computer of the plant P in the received data format including the time and the data of each input point as shown in FIG.

【0098】

As shown in the flow chart in FIG. 18, the contact data collection / recording means 83 waits for the received data shown in FIG. 17 to be input to the process input processing means 3 at regular intervals (step 600), and when the data is input, the process input is performed. The time of the received data from the processing means 3 and the data at the input point 1 are read (step 601).

【0099】

Check if it is the first data in one day based on the time of the received data (step 602), and if it is the first, register the input point, contact data and time in the contact database 81 (603), and this registered contact data Is set as the previous value (604).

【0100】

For the second and subsequent received data, the input value of each input point is compared with the previous value (step 605), and if they are the same, they are not registered in the contact database 81. Only when the data is changed in step 605, the input value is registered in the contact database 81 and set as the previous value.

【0101】

As a result, when the data value of a certain input point behaves as shown in FIG. 19, the contact database 81 does not record the contact data at the point where the data value does not change (time t1, t3, t4, t6). , Only the contact data (t0, 0), (t2, 1), (t5, 0) of the start time and the time of each change point are recorded.

【0102】

As is clear from the above description, according to the present embodiment, the number of data and the database are obtained by recording the contact data of only the change points among the contact data transmitted at a fixed cycle in the contact database. It is possible to reduce the size of the database and save labor.

【0103】

In the above embodiment, the plant data is stored and processed as power generation operation data on a daily basis. However, for example, for data with little fluctuation such as contact system data and analog system data constants, the data storage unit is used. It can be one month or one year, and it is possible to build a database with higher recording efficiency.

【0104】

Further, the plant data collection / recording device of the above embodiment can be constructed as an object-oriented database. In this case, the format of the power generation operation history database is changed because the operation program for accessing the power generation operation history data can be stored in the object-oriented database at the same time as the saved power generation operation history data. Even in such a case, it is not necessary to change individual applications related to this power generation operation history database by simply changing the operation program, and the ripple effect on the format change of the power generation operation history database can be minimized.

【0105】

[Effect of the invention]

As described above, according to the present invention, the cross-sectional plant data transmitted at a fixed cycle is edited in time series, and at that time, several types of time series data having different recording cycles are created and saved. Long-term storage of time-series data and improvement of search speed can be achieved.

【0106】

Further, according to the present invention, the compressed value of the plant data is calculated from the maximum value and the minimum value of the plant data for a predetermined period, and the compressed value is stored as the operation history data to improve the data recording efficiency and lengthen. Data can be stored for a period of time.

【0107】

Further, according to the present invention, by changing the recording cycle of plant data according to the event state of the plant at that time, for example, the recording cycle is shortened when starting and stopping, and the recording cycle is lengthened when the load is stable. Fine-grained recording is possible, and data recording efficiency can be improved.

【0108】

Further, according to the present invention, with respect to the plant data for each cycle of a predetermined period, the operation history data is thinned out by thinning out the recording of the plant data when it is substantially equal to the value extrapolated in that cycle from the previously stored value and the value stored two times before. It is possible to reduce the recording capacity of plant data and efficiently record data without impairing its purpose and application.

【0109】

Further, according to the present invention, an estimated value that is expected to be transmitted next is calculated from the past plant data, and when this estimated value and the actually transmitted value are approximately equal, the newest data in the past plant data. Is deleted from the operation history database, so that the data recording efficiency can be improved without impairing the purpose and use as the operation history data.

【0110】

Further, according to the present invention, by recording only the data value at the time of the change of the contact data, the data recording efficiency can be improved and the data can be stored for a long period of time.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram which shows the plant data collection recording apparatus of 1st Embodiment of this invention.

[Figure 2]

It is a figure which shows the data structure of the data collection temporary storage file 7 in FIG.

[Fig. 3]

It is a figure which shows the data structure of the time series data storage file 11 in FIG.

[Fig. 4]

It is a flowchart which shows the operation of the time series data storage means 9 in FIG.

[Fig. 5]

It is a block diagram which shows the plant data collection recording apparatus of the 2nd Embodiment of this invention.

[Fig. 6]

It is a figure which shows the data structure example of the plant database 21 in FIG.

[Fig. 7]

It is a figure which shows the data structure example of the maximum / minimum compression database 27 in FIG.

[Fig. 8]

It is a flowchart which shows the operation of the plant data collection recording apparatus shown in FIG.

[Fig. 9]

It is a block diagram which shows the plant data collection recording apparatus of 3rd Embodiment of this invention.

[Fig. 10]

It is a figure explaining the relationship between the event state (load stabilization, disconnection, ignition, etc.) of a plant and a recording cycle in 3rd Embodiment.

[Fig. 11]

It is a flowchart which shows the operation of the plant data collection recording apparatus shown in FIG.

[Fig. 12]

It is a block diagram which shows the plant data collection recording apparatus of 4th Embodiment of this invention.

[Fig. 13]

It is a flowchart which shows the operation of the plant data collection recording apparatus shown in FIG.

[Fig. 14]

It is a block diagram which shows the plant data collection recording apparatus of 5th Embodiment of this invention.

[Fig. 15]

It is a flowchart which shows the operation of the plant data collection recording apparatus shown in FIG.

[Fig. 16]

It is a block diagram which shows the plant data collection recording apparatus of 6th Embodiment of this invention.

[Fig. 17]

It is a figure which shows an example of the received data format of process input processing means 3.

[Fig. 18]

It is a flowchart which shows the operation of the contact data collection recording means 83 in FIG.

[Fig. 19]

It is a figure which shows the transmission data example of contact data.

[Explanation of symbols]

1 ......... Plant data collection / recording device, 3 ......... Process input processing means, 5 ......... Current data storage means, 7 ... ...... Data collection temporary storage file, 9 ............ Time series data storage method, 11 ......... Time series data storage file, 13. ..... .... External storage device recording means, 15 ......... Data search means, 21 ......... Plant database, 23 ......... Maximum value Minimum value calculation means, 25 ......... Maximum / minimum compression value creation means, 27 ......... Maximum / minimum compression database, 29 ......... Maximum -Minimum compressed data storage means, 31 ......... Plant event judgment table, 33 ......... Recording condition judgment means, 35, 73 ......... Data Recording means, 37, 51, 61 ......... Power generation operation history database, 41 ......... Maximum / minimum value calculation means, 43 ......... Maximum / minimum value storage database, 45 ......... Data thinning rate storage database, 47 ......... Data thinning tolerance calculation means, 49 ........ .Data thinning means, 53 ......... Database deletion means, 63 ......... Estimated value calculation means, 65 ......... Estimated value storage database, 67 ......... Thinning tolerance judgment rate storage database, 69 ......... Thinning judgment means, 71 ......... Plant data thinning means, 81 ... ...... Contact database, 83 ......... Contact data collection and recording method