Direct-current transmission inversion-side frequency control method.
Abstract
A direct-current transmission inversion-side frequency control method, comprising: sending to an inversion-side frequency controller a deviation between inversion-side power grid frequency and rated frequency; the frequency controller, according to different operation conditions, employs an adaptive parameter to conduct modulation and output the quantity of modulation; when interstation communication is normal, the modulation quantity enables a new power/current instruction to be generated at a rectifier side and an inversion side via the interstation communication, thus changing the magnitude of the direct-current transmission power to control the inversion-side frequency; when the interstation communication has an error, constant voltage control at the inversion side is converted into constant current control, and the constant current control at the rectifier side is converted into constant voltage control, and the modulation quantity outputted by the frequency controller is superposed onto the power/current instruction at the inversion side, thus regulating the magnitude of the direct-current transmission power to control the frequency of the inversion side. The method realizes rapid and efficient adjustment of the inversion-side frequency, effectively solving the problem of controlling the inversion-side frequency when the interstation communication has an error.

Term
8.3 yearsleft in the term
Expires 22 January 2035.
- Priority
- Filed
- Granted
- Today
- Expires
6 claims: 5 independent, 1 dependent
- 1REIVINDICACIONES INSTI ib ' Π»Γ I 1. Un método de implementación de control de frecuencia del lado inversor para transmisión de corriente continua, caracterizado porque comprende las siguientes etapas:(1) adquirir el estado de función de control de frecuencia, ejecutar una etapa (2) en un estado de entrada, y terminar el control de frecuencia en un estado de salida;
- 2(2) transmitir la desviación entre la frecuencia de red eléctrica del lado inversor y frecuencia nominal al controlador de frecuencia del lado inversor, en donde el controlador de frecuencia regula y emite una cantidad de modulación ADP al adoptar parámetros auto-adaptivos de acuerdo con diferentes condiciones de operación;
- 3(3) adquirir el estado de comunicación entre estaciones, ejecutando una etapa (4) cuando la comunicación entre estaciones sea normal;y ejecutar las etapas (5), (6) y (7) si la comunicación entre estaciones falla de lo normal;
- 4(4) causar que el lado rectificador y el lado inversor forme un nuevo orden de energía/corriente a través de la comunicación entre estaciones por la salida de Ά.. •'r INSTITUTO MEXICANO V cantidad de modulación Δ0Ρ del controlador de °fr¿ ;cra®aciV x del lado inversor, regulando por el cnfttTOTd'flOT' ' de~ energía/corriente en el lado rectificador de acuerdo con el nuevo orden de energia/corriente, logrando de esta manera el control de frecuencia del lado inversor al cambiar el tamaño de la potencia de transmisión;y terminar la función de control de frecuencia después de que se ejecute la cantidad de modulación ΔϋΡ;
- 5(5) convertir el lado inversor en control de corriente a partir de control de voltaje y convertir el lado rectificador en control de voltaje a partir del control de corriente;
- 6(6) actualizar forzadamente un valor de energía medido realmente de corriente como el orden de energía del lado inversor y mantener durante tlms, en donde el operador puede fijar un orden de energía en si de acuerdo con la instrucción de programación después de tlms; emitir forzadamente cero del controlador de frecuencia del lado inversor dentro de t2ms, restablecer la salida del controlador integral de frecuencia como cero, y trabajar normalmente después de t2ms; renunciar forzadamente el controlador de frecuencia del lado rectificador y reiniciar la salida del controlador integral de frecuencia como cero; IMPI (7) superponer la salida de INDUSTRIAL modulación ΔϋΡ del controlador de frecuencia del lado inversor al orden de energía/corriente del lado inversor, regular por el controlador de energía/corriente del lado inversor de acuerdo con el nuevo orden de energía/corriente, logrando de esta manera el control de frecuencia del lado inversor al cambiar el tamaño de la potencia de transmisión; y terminar la función de control de frecuencia después de que se ejecute la cantidad de modulación ΔϋΡ. 2. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque el intervalo de valores de ti es 0-200ms y ei intervalo de valores de t2 es 0-100ms. 3. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque se renuncia automáticamente a la función de £ Sjf ? ξ, ’* -XL «A» * JX - i. instituto .7?:xrcArio control de frecuencia del lado inversor en f en el proceso de incremento x.adncc i ón -, energia/corriente de cualquier polo del lado rectificador o lado inversor, y es ingresada automáticamente después de que el proceso de incremento o reducción es terminado;se renuncia automáticamente a la función de control de frecuencia del lado inversor cuando la corriente continua no puede ser cambiada y es ingresada automáticamente hasta que la corriente continua pueda ser cambiada. 4. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque la salida de cantidad de modulación ΔϋΡ del controlador de frecuencia del lado inversor causa que el lado rectificador y el lado inversor formen un nuevo orden de energia/corriente a través de la comunicación entre estaciones significa que cuando el orden de energia/corriente es generado en el lado rectificador, la salida de cantidad de modulación ΔϋΡ del controlador de frecuencia del lado inversor es transmitida al lado rectificador a través de la comunicación entre estaciones y INSTITUTO MEXICANO la superposición al orden de energia/corriente d' rectificador para generar un nuevo . orden de energia/corriente, y el lado inversor sigue el nuevo orden a través de la comunicación entre estaciones;cuando el orden de energia/corriente es controlado para ser generado por el lado inversor, la salida de cantidad de modulación Δ0Ρ del controlador de frecuencia del lado inversor es superpuesta directamente en el orden de energia/corriente del lado inversor para generar un nuevo orden de energia/corriente, y el rectificador sigue el nuevo orden por la comunicación entre estaciones. 5. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque el controlador de frecuencia trabaja en el polo de control, y el polo con comunicación entre estaciones normales está antes en el polo de control;el polo no de control rastrea la salida de controlador de frecuencia del polo de control;la corriente continua del polo de control no puede ser cambiada, pero la corriente continua del polo no de control puede ser cambiada, la función del control de i Χ'ί·Α x A INSTITUTO mexicano frecuencia del polo de control no es renunoí®®^ cantidad de modulación generada por el -gw^'t^e-lenáo-g· frecuencia del polo de control es transmitida al polo no control por comunicación interpolar, y el polo no control regula la energía de transmisión para controlar frecuencia. de de la 6. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 5, caracterizado además porque el polo no de control rastrea la salida de controlador de frecuencia del polo de control significa que la salida de controlador de frecuencia del polo no de control rastrea la salida del controlador de frecuencia del polo de control en todo momento;la cantidad de modulación para regulación de energía del polo no de control proviene de la salida de controlador de frecuencia del polo de control. 7. El frecuencia del método de implementación de control lado de inversor para transmisión de de corriente continua de conformidad con la reivindicación 1, caracterizado además porque condiciones de operación di IMPI OtóTITUTO MK'C/.flO OI LA PKOflíCAil que un modo de control de energía bipolar tiene comunicaciones operadas a diferentes niveles de energía;un modo de control de energía monopolar tiene comunicaciones operadas a diferentes niveles de energía;un modo de control de energía bipolar no tiene comunicaciones operadas a diferentes niveles de energía;un modo de control de energía monopolar no tiene comunicaciones operadas a diferentes niveles de energía;un modo de control de corriente monopolar tiene comunicaciones operadas a diferentes niveles de energía y un modo de control de corriente monopolar no tiene comunicaciones operadas a diferentes niveles de energía. 8. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque la salida de energía de modulación del controlador de frecuencia es distribuida entre los dos polos con base en la proporción de los valores absolutos de voltaje directo de operación de los dos polos y a través de un enlace limitador de energía IMPI ΐΝ5τη.σο με/.·:αι·ό bl·. J.A ?RO?!f¡?AO ¡ÍWJSTIUAL 9. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque el controlador de frecuencia del lado inversor comprende un controlador proporcional de frecuencia y un controlador integral de frecuencia;el controlador integral de frecuencia lleva a cabo reinicio con un coeficiente kl en el proceso de incremento o reducción de energía/corriente de cualquier polo del lado rectificador o lado inversor, el proceso de reinicio es detenido una vez que concluye el proceso de incremento o reducción y el intervalo de valores de kl es 0-1. 10. El método de implementación de control de frecuencia del lado de inversor para transmisión de corriente continua de conformidad con la reivindicación 1, caracterizado además porque la comunicación entre estaciones falla de lo normal significa que dos polos operan ambos, y la comunicación entre estaciones de los dos polos falla de lo normal;o estaciones normal;o estaciones dos polos sólo de sólo un del polo INSTITUTO MEXICANO , ,~r^cJlJA , Ί . DE LA PROPIEDAD operan ambos, y la comunicaciowuswitrs^^™* un polo es normal, la cu 3^--^-1-1¾.....de· lo· polo opera, y la comunicación entre falla de lo normal.
Independent claims6
162 paragraphs in 16 sections, as filed
(54) Title: INVERTER SIDE FREQUENCY CONTROL METHOD FOR DIRECT CURRENT TRANSMISSION.
(54) Title: DIRECT-CURRENTTRANSMISSION INVERSION-SIDE FREQUENCY CONTROL METHOD.
(57) Summary
The invention describes an inverter-side frequency control implementation method for high-voltage / ultra-high-voltage direct current transmission, comprising the following steps: transmitting a deviation between the inverter-side power grid frequency and the nominal frequency to the inverter-side frequency controller, where the frequency controller regulates and outputs a modulation amount by adopting self-adaptive parameters according to different operating conditions; When the communication between stations is normal, the modulation amount output of the inverter side frequency controller causes the rectifier side and the inverter side to form a new power / current order through the communication between stations, thus achieving the frequency control of the inverter side when changing the size of the transmission energy; When communication between stations is abnormal, convert the inverter side to current control from voltage control and convert the rectifier side to voltage control from current control; superimpose the modulation amount output of the inverter side frequency controller to the inverter side power / current order; resize transmission power to achieve inverter side frequency control. The method achieves the efficient and fast regulation function in inverter side frequency, and effectively solves the inverter side frequency control problem for communication failure between stations.
(57) Abstract
A direct-current transmission inversion-side frequency control method, comprising: sending to an inversion-side frequency controller a deviation between inversion-side power grid frequency and rated frequency; the frequency controller, according to different operation conditions, employs an adaptive to meter to conduct modulation and output the quantity of modulation; when interstation communication is normal, the modulation quantity enables a new power / current instruction to be generated at a rectifier side and an inversion side via the interstation communication, thus changing the magnitude of the direct-current transmission power to control the inversion-side frequency ; when the interstation communication has an error, constant voltage control at the inversion side is converted into constant current control, and the constant current control at the rectifier side is converted into constant voltage control, and the modulation quantity outputted by the frequency controller is superposed onto the power / current instruction at the inversion side, thus regulating the magnitude of the direct-current transmission power to control the frequency of the inversion side. The method realizes rapid and efficient adjustment of the inversion-side frequency, effectively solving the problem of controlling the inversion-side frequency when the interstation communication has an error.
<img file="MX356241B_D0001.tif" />
PATENT TITLE No. 356241
Owner (s): NR ELECTRIC CO., LTD; NR ELECTRIC ENGINEERING CO., LTD.
Address: No. 69, Suyuan Avenue, Jiangning District, 211102, Nanjing, Jiangsu, CHINA
D nomination: INVERTER SIDE FREQUENCY CONTROL METHOD FOR DIRECT CURRENT TRANSMISSION.
Classification: CIP: H02M5 / 45; H02M3 / 24; H02M5 / 42: H02M5 / 451; H02M5 / 458; H02M7 / 757
CPC: H02M3 / 24; H02M5 / 42: H02M5 / 45; H02M5 / 451: H02M5 / 458; H02M7 / 7575
Inventor (s): WENQIANG ZHAO; LIN Ll: YONGPING WANG
REQUEST
Number: International Presentation Date:
MX / a / 2016/015968 January 22, 2015
PRIORITY
Country: Date: Number:
CN July 4, 2014 201410321630.9
Validity: Twenty years
Expiration Date: January 22, 2035 Issue Date: May 16, 2018
The reference patent is granted based on articles 1 ° 2 ° fraction V, 6'fraction til, and. 59 leaves the Industrial Property Law.
In accordance with article 23 of the Industrial Property Law, this patent has a validity of twenty non-extendable years, counted from the date of filing of the international application and will be subject to the payment of so much to keep your rights in force.
Whoever subscribes to this title does so based on the provisions of articles 6, sections III and 7, bis'2 of the Industrial Property Law (Official Gazette of the Federation (D OF) 27/0611991, amended on 02 / 08/1994, »/ 10/1996, 12/26/1997. 05/17/1999, 01/26/2004, 06/16/2006, 01/25/2006, 06/05/2009 / 06/01 / 2010,16 / 06 / 2Ó10, 06/28/2010, 01/27/2012 and 04/09/2012}! Articles 1 ». 3 "section V, subsection a), 4 and 12" sections I and III of the Regulations of the Mexican Institute of Industaal Property (DO F¡ 12/14/1999, amended on 07/01/2002, 07/15/2004, 07/28/2004 and 09/07/2007); articles 1, 3, 4, 5 »section V subsection a), 16 sections t and til» and 30 of the Organic Statute of the Mexican Institute of Industrial Property (DO F. 12/27/1999, amended on 10 / 10/2002, 07/29/2004, 04/06/2004 and 1.3 / 09/2007) :, 1st. 3 * f and S? subsection a) of the Agreement that delegates powers to the Deputy Directors General, Coordinator, Divisional Directors,, Heads of Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property, (DOF 12/15/1999 , amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007). ' or
This letter is signed with an advanced electronic signature (FIEL), based on articles 7 BIS 2 of the Industrial Property Law; 3 of its Regulations, and 1 fraction III, 2 fraction V, 26 BIS and 26 TER of the Agreement establishing the guidelines for the use of the Electronic Payment and Services Portal (PASE) of the Mexican Institute of Industrial Property, in the procedures indicated.
THE DIVISIONAL DIRECTOR OF PATENTS
NAHANNY CANAL REYES
<img file="MX356241B_D0002.tif" />
Original string:
NAHANNY MARISOL CANAL REYES | 00001000000403252793 | Tax Administration Service] 1695 || MX / 2018/42782 | MX / a / 2016/015966 | Patent title PCT | 1027 | RGZ | Pág (s) 1¡DBwBIRCsXP0dTVSYohcw5yATJQs =
Digital stamp:
BmzsNuDZUo3nD / JWbji / XRIxPpG + fz3kkclbxffPSOrozNYL / n5xCvXaOWCKhOVUGDeV2uM7IG4kSAAr4gXXSOtAAX
E4jymU / SuschQgWil2SSc7trzVm6J3NWGof1EfALrsqSFrXSyUflGDnJKuqk7RG4p07yyVSVQUrJDpqrMQYv4bneQ kNjmRGyJuc / hClfThlXC91FNsU4R + IG7PfPtqrmuocX2s + U7MayDF2QyV / L / PYxUTog + rrSTKJmUjarhcEvrKU7x3
WSkriorhaV6OjkEadZBGeTKzw20T0EN0kYN5dOTNggE5XWBiEkgzfoHuQqT4BD5lxh0CTXLg ==
<img file="MX356241B_D0003.tif" />
56'λΗΐ
SIDE FREQUENCY CONTROL METHOD
DIRECT CURRENT TRANSMISSION
<img file="MX356241B_D0004.tif" />
Background of the Invention
Technical field
The present invention relates to an inverter-side frequency control method of high-voltage direct current transmission and ultra-high-voltage direct current transmission systems, applied to the field of high-voltage and ultra-direct current transmission -high voltage.
Related technique
<td></td><td>The</td><td>contx</td><td colspan="2">'ol frequency is a method</td><td>of control</td>
<td>stable</td><td>in</td><td>the</td><td>transmission systems</td><td>of</td><td>stream</td>
<td>keep going</td><td>of</td><td>high</td><td>voltage / ultra-high voltage</td><td colspan="2">(HVDC), and the</td>
<td>fast</td><td colspan="2">capacity</td><td>control system</td><td>of</td><td>stream</td>
<td>keep going</td><td>I know</td><td>uses</td><td>to achieve the goal</td><td>of</td><td>change the</td>
frequency of an alternating current system connected by regulating direct energy. When the alternating current system connected to the direct current system is altered, the frequency control function can
<img file="MX356241B_D0005.tif" />
THE PROPERTY
<img file="MX356241B_D0006.tif" />
. -, * - <* - u / - »I i'ur ir.ur \ u restore the alternating current system tí'SW ^ '- seí' stable by regulating the transmission power“ Tte ± —s-LsLemn<sup>1</sup> direct current.
Frequency control is important especially when the received final AC power grid is a weak system.
In a conventional direct current system the rectifier side adopts current (energy) control, the inverter side adopts voltage or extinction angle control. Due to the current (power) control on the rectifier side, a conventional direct current frequency controller is configured on the rectifier side; Inverter-side frequency control is achieved by transmitting the measured frequency value from the inverter side to the frequency controller on the rectifier side by inter-station communication. However communication between stations causes phase delay to the frequency controller and the control precision is affected. When communication between stations is abnormal, the measured frequency value from the inverter side cannot be transmitted to the rectifier side. CN200510081612.9 provides a method for frequency control by regulating the forward voltage on the inverter side when communication between stations
<img file="MX356241B_D0007.tif" />
IMPI
MEXICAN INSTITUTE OF PROPERTY has a defect. In this method, in an aspec ^?)<sup>or</sup>F<sup>RIAI</sup>Reactive power loss is increased by '' due to reduced forward voltage, and increased forward voltage will threaten system safety, even cause switching failure, on the one hand, forward voltage is limited in regulating the range and at one speed Slow regulation, resulting in limited frequency control capabilities. The simulation study of Frequency Modulation in Shengsi Direct Current system in Electrical Equipment magazine in the ninth volume, 2008, proposed a method of DC control for the inverter side to achieve frequency control on the inverter side when communication between stations is interrupted, but since the rectifier side operates at a fixed alpha angle, the direct voltage of the system cannot be regulated, and the frequency control capacity is insufficient.
Brief description of the invention
An object of the present invention is to provide an inverter-side frequency control method for high-voltage / ultra-high-voltage direct current transmission, which can achieve control
<img file="MX356241B_D0008.tif" />
TJi <U Uk MEXICAN INSTITUTE,. , Dt THE PROPERTY fast and efficient frequency of the electrical network<sup>1</sup>· The inverter side.
In order to achieve the objective, a technical solution of the present invention is an inverter-side frequency control implementation method for direct current transmission, characterized in that it comprises the following stages:
(1) acquiring the frequency control function state, executing a step (2) in an input state, and terminating the frequency control in an output state;
(2) transmit the deviation between the inverter-side power grid frequency and the nominal frequency to the inverter-side frequency controller, where the frequency controller regulates and outputs a modulation amount ΔϋΡ by adopting self-adaptive parameters according to different Operating conditions;
(3) acquire the state of communication between stations, executing a step (4) when the communication between stations is normal; and executing steps (5), (6) and (7) if communication between stations fails than normal;
(4) cause the rectifier side and the inverter side to form a new order of energy / current through
<img file="MX356241B_D0009.tif" />
of communication between stations through the li output. <i. JX MEXICAN INSTITUTE D¿ LA PROPT5DAD
INDUSTRIAL
<td>the</td><td>departure</td><td>of</td>
<td>r of</td><td colspan="2">frequency</td>
<td colspan="2">controller</td><td>of</td>
<td colspan="2">: agree with</td><td>the</td>
<td>of</td><td colspan="2">this way</td>
<td> to the</td><td>change</td><td>the</td>
<td>linar</td><td colspan="2">the function</td>
<td>I know</td><td>run</td><td>the</td>
<td>in</td><td>control</td><td>of</td>
<td colspan="2">and convert</td><td>the</td>
<td>to</td><td>depart</td><td>of the</td>
modulation amount ΔϋΡ of the frequency controller modulation amount ΔΡΡ;
current control;
(6) forcibly update a actually measured current energy value as the inverter side energy order and hold for tlms, where the operator can set an energy order itself according to the programming instruction after tlms; forcibly output inverter-side frequency controller zero within t2ms, reset the integral frequency controller output to zero, and work normally after t2ms; forcibly give up the frequency controller on the rectifier side and restart
<img file="MX356241B_D0010.tif" />
Δ modulation of the inverter side frequency controller to the inverter side energy / current order, regulated by the inverter side energy / current controller according to the new energy / current order, thus achieving frequency control of the inverter side by changing the size of the transmit power; and terminate the frequency control function after the modulation amount ΔϋΡ is executed.
In the solution:
The range of ti values is 0-200ms and the range of t2 values is 0-100ms.
In the solution: the frequency control function of the inverter side is automatically renounced temporarily in the process of increasing or reducing energy / current of any pole of the rectifier side or inverter side, and it is automatically entered after it is finished the process of increase or reduction; the inverter-side frequency control function is automatically forgone when the direct current cannot be changed and is automatically input until
<img file="MX356241B_D0011.tif" />
<img file="MX356241B_D0012.tif" />
FROM INDUSTMUL PROPERTY that the direct current can be changed.
In the solution: The ΔϋΡ modulation quantity output of the inverter side frequency controller causes the rectifier side and inverter side to form a new power / current order through inter-station communication means that when the power / current order is generated in the rectifying side, the modulation amount output ΔϋΡ of the frequency controller on the inverter side is transmitted to the rectifier side through inter-station communication and the superposition of the rectifier side power / current order to generate a new power / current order, and the inverter side follows the new order through communication between stations; When the power / current order is controlled to be generated by the inverter side, the modulation amount output
ΔϋΡ of the inverter side frequency controller is directly superimposed on the inverter side power / current order to generate a new power / current order, and the rectifier follows the new order for communication between stations.
In the solution: the frequency controller works on the control pole, and the pole with
<img file="MX356241B_D0013.tif" />
between stations normal is before in the pot — the non-control pole tracks the frequency controller output from the control pole; the direct current of the control pole cannot be changed, but the direct current of the non-control pole can be changed, the frequency control function of the control pole is not waived, the amount of modulation generated by the frequency controller of the The control pole is transmitted to the non-control pole by interpolar communication, and the non-control pole regulates the transmission power to control the frequency.
<img file="MX356241B_D0014.tif" />
In the solution, a non-control pole tracks the output of the frequency controller from the control pole means that the frequency controller's output from the non-control pole tracks the output of the frequency controller from the control pole at Mud time; the amount of modulation for power regulation of the non-control pole comes from the output of the frequency controller of the control pole.
In the solution: different operating conditions mean that the two-pole power control mode has communications operated at different power levels; a control mode of
IMPIO industrial ^ * «uj polo has communications operated at different levels of. ·· v
<img file="MX356241B_D0015.tif" />
«Mzz.ersvr-nemaB <
Energy; A two-pole control mode does not have communications operated at different power levels; A single pole power control mode does not have communications operated at different power levels; A single pole power control mode does not have communications operated at different power levels; a one pole current control mode has communications operated at different energy levels; and a one pole current control mode does not have communications operated at different power levels.
In the solution, the modulation energy output of the frequency controller is distributed between the two poles based on the proportion of the absolute values of direct operating voltage of the two poles and through an energy limiting link.
In the solution, the inverter-side frequency controller comprises a proportional frequency controller and an integral frequency controller; the integral frequency controller · performs reset with a kl coefficient in the process of increasing power / current reduction of any
<img file="MX356241B_D0016.tif" />
. , _. ,,,, MEXICAN INSTITUTE k pole of the rectifier side or inverter side, the restart is stopped after the · ... increase or decrease process is finished and the range of values of kl is 0-1.
In the solution, the communication between stations fails of the normal means that the two poles operate both, and the communication between stations of the two poles fails of the normal; or two poles both operate, and communication between stations of only one pole is normal, which becomes unsuccessful; or only one pole operates, and communication between pole stations fails than normal.
The present invention has the beneficial effects of:
1, achieve fast and precise regulation at the inverter-side power grid frequency and meet the requirements for safe and scalable operation of the inverter-side power grid under various working conditions;
2, solve the inverter-side frequency control problem when communication between stations is abnormal, and achieve fast and efficient inverter-side frequency regulation in case of failure in
<img file="MX356241B_D0017.tif" />
communication between stations
<img file="MX356241B_D0018.tif" />
MEXICAN INSTITUTE Say industrial PROPERTY
Brief description of the drawings
<td>The</td><td>figure</td><td> 1</td><td>is the diagram of</td><td>flow of</td>
<td colspan="2">logical functions of</td><td>the</td><td>present invention.</td><td></td>
<td>The</td><td>figure</td><td> 2</td><td>is the diagram of</td><td>logical blocks</td>
<td>full of</td><td>control</td><td>of</td><td>side frequency</td><td>investor in the</td>
<td colspan="2">present invention.</td><td></td><td></td><td></td>
<td>The</td><td>figure</td><td> 3</td><td>is the diagram</td><td>of logic of</td>
distribution of the output energy ΔϋΡ of the inverter-side frequency controller between two poles in the present invention.
Figure 4 is the critical logic diagram of communication failure between stations in the present invention.
Figure 5 is the logical diagram of the adjustment of control strategies for both stations.
Detailed description of the invention
The present invention provides an inverter-side frequency control method for high-voltage / ultra-high-voltage direct current transmission, which can achieve fast and efficient control of the
<img file="MX356241B_D0019.tif" />
TMPI «« L * «í J:., JX; <sub>4</sub>.
mains frequency on the inv ^^ f rr.ivusTKiAL side technical solution of the present invention is described in combination with a flow chart of logical functions as shown in figure 1. The method specifically comprises the following steps:
(1) Acquire the frequency control function status set by an operator, execute step (2) if the frequency control function is entered and in an input state, and terminate the frequency control if the frequency control function.
The status of frequency control function is affected by the following three aspects:
A, Inverter side frequency control function is temporarily bypassed automatically in the process of increasing or decreasing power / current of any pole of the rectifier side or inverter side, and it is automatically entered after the process of
<td>increase</td><td>or reduction</td><td>is</td><td>finished;</td><td></td><td></td>
<td>B</td><td colspan="2">, resign</td><td>automatically to</td><td>the</td><td>function of</td>
<td>control of</td><td>frequency</td><td>of the</td><td colspan="2">investor side when</td><td>the current</td>
<td>keep going</td><td>can not</td><td colspan="2">be changed and</td><td>is</td><td>entered</td>
automatically until the direct current can be changed. For example, for some project
INDUSTRIAL
IΜ Ρ
INDUSTRIAL to a weak alternating current system, the operating direct voltage is normally less than 70% of the nominal direct voltage during HVDC startup, in order to reduce the converter valve voltage in this condition, the direct current is limited to be the minimum operating current, which cannot be increased as long as the operating voltage is less than 70%, therefore, when the operating voltage is less than 70% of the nominal voltage, The inverter-side frequency control function is automatically bypassed and automatically entered only if the operating voltage is not less than 70%.
C, the direct current of the control pole cannot be changed, but the direct current of the non-control pole can be changed, the frequency control function of the control pole is not renounced, the amount of modulation generated by the controller The frequency of the control pole is transmitted to the non-control pole by interpolar communication, and the non-control pole regulates the transmit power to control the frequency.
(2) As shown in Figure 2, the
IMPI
AMO _________ PAP rectifier controls DC power / current<sup>t</sup>'4? Ft<sup>l</sup>to<sup>L</sup>ndo * 'communication between stations is normal-τγγτ ^ ΠΦ ^ Τ ^ οΤ ”
INSTITUTO mexicana DE LA ΡΧΟΡιέΠΛΟ when communication between stations is abnormal, the inverter controls the power / direct current. The deviation between the measured inverter side grid frequency and the nominal frequency is input to the inverter side frequency controller, and the frequency controller regulates and outputs a modulation amount ΔϋΡ by adopting self-adaptive parameters according to different conditions of operation, different operating conditions mean that bipolar power control mode has communications operated at different power levels; A unipolar energy control mode has communications operated at different energy levels; A bipolar energy control mode does not have communications operated at different energy levels; A monopolar power control mode does not have communications operated at different power levels; a monopolar current control mode has communications operated at different power levels; and a monopolar current control mode has no communications operated at different power levels.
Here, the frequency controller works on the
<img file="MX356241B_D0020.tif" />
control pole, and the non-control pole rastr of the frequency controller of the control pole.
Figure 3 shows that the modulation energy output of the frequency controller is distributed between the two poles based on the ratio of the absolute values of direct operating voltage of the two poles and through an energy limiting link.
For example, one pole that operates direct voltage is 500kV, the other pole that operates direct voltage is 400kV, so the pole with the direct voltage of 50CkV carries the modulation amount of pct - ΔΖ) / * and the pole with current voltage 400kV continuous carries the modulation amount of
400
500 + 400 \ DP
A non-control pole tracks the output of the frequency controller from the control pole means that the frequency controller's output from the non-control pole tracks the output of the frequency controller from the control pole at all times; The amount of modulation for non-control pole power regulation comes from the output of the control pole frequency controller.
Here, the inverter-side frequency controller comprises a proportional controller of í Tí τ frequency and an integral controller of fre<sup>s</sup>ci3®? i'e »rá-íD
INlJlJS'mAL ^ X, Γ -— ** integral frequency controller performs reset_ with a coefficient kl in the process of increasing or decreasing energy / current of any pole on the rectifier side or inverter side, the reset process is stopped once the increase or decrease process is finished and the range of kl values is 0-1.
(3) Acquire the communication status between stations, execute step (4) when communication between stations is normal; and executing steps (5), (6) if communication between stations fails than normal, where, as shown in Figure 4, that communication between stations fails from normal means that two poles operate both, and the communication between stations of the two poles fails than normal; or two poles operate both, and communication between stations of only one pole is normal, which fails of or normal; or only one pole operates, and communication between pole stations fails than normal. For example, in Figure 4, 1 is the selector and is the select signal. When 2 is true, the selector output is upper input, and 2 is false, the selector output is lower input. That is, when pole 1 is true, the output of the operation of the
IMPI
INSTITUTO MEXICANO lS - - · * selector is the communication failure between this ^^ J ^ g ^<sup>1</sup>'pole 1, otherwise the selector output is true; _ when the operation of pole 2 is true, the selector output is the communication failure between stations of the
<td>pole</td><td> 2,</td><td>otherwise,</td><td>the</td><td>departure</td><td>of the</td><td>selector is</td>
<td colspan="2">true.</td><td>Here, the value</td><td>of</td><td>the mistake</td><td>of</td><td>communication</td>
<td>between</td><td colspan="2">pole stations 1</td><td>or</td><td>the mistake</td><td>of</td><td>communication</td>
between stations of pole 2 or the communication failure between stations is true or false.
(4) cause the rectifier side and reverse side to form a new order of power / current through inter-station communication by the modulation amount output ΔϋΡ of the inverter side frequency controller, regulated by the power controller / current on the rectifier side according to the new order of energy / current, thereby achieving frequency control on the inverter side by changing the size of the transmit power; and terminate the frequency control function once the modulation amount ΔϋΡ is executed;
where, the modulation amount output
Inverter side frequency controller ΔϋΡ cause
JMFHC
INSTITUTO MEXICANO that the rectifier side and the inverter side form energy / current order through the commonTtaCTrót • '-eri'trge »stations means that when the energy / current order is generated on the rectifier side, the modulation amount output Δ0Ρ of the inverter-side frequency controller is transmitted to the rectifier side through inter-station communication and the superposition of the power / current order of the rectifier side to generate a new order of power / current, and the inverter side follows the new order through communication between stations; When the power / current order is controlled to be generated by the inverter side, the modulation amount output
ΔϋΡ of the inverter side frequency controller is directly superimposed on the inverter side power / current order to generate a new current power order, and the rectifier follows the new order for communication between stations.
(5) As shown in figure 5, convert the inverter side into current control from voltage control and convert the rectifier side into voltage control from current control. In Figure 5, it is a selector, and 2 is a select signal. When 2
IMPIOUS
INSTITUTE M £> JC * .NO V
FROM THE I PG <'¡<sup>1</sup> DAD V<sup>v</sup>'ir-' ^ S¿ is true, the ALPHA order of the inverter probi ^ AíW · '· dMÜÍÍLJ current controller, and when 2 is fcTt'Str; —er ± —ercMesALPHA of the inverter comes from the voltage controller.
(6) Forcibly update a current actually measured power value as the inverter side power order and hold for 0 ~ 200ms, where the operator can set a power order per se according to the programming instruction after 0 ~ 200ms; forcibly output inverter-side frequency controller zero within CHlOOms, reset the integral frequency controller output to zero, and work normally after 0 ~ 100ms; forcibly forego the rectifier side frequency controller and reset the integral frequency controller output to zero;
(7) superimpose the modulation amount output ΔϋΡ of the inverter side frequency controller to the inverter side power / current order, regulate by the inverter side power / current controller according to the new power / current order, thus achieving frequency control on the inverter side by changing the size of the transmit power; and terminate the frequency control function once the ΔϋΡ modulation amount is executed.
IMP
Contents16
23 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23
19 members in 10 offices
Priority claims9
| Document | Office | Kind | Date |
|---|---|---|---|
| 201410321630 | China | A | |
| 201410321630 | China | A | |
| 2014103216309 | China | – | |
| 2015071278 | China | W | |
| 2015071278 | China | W | |
| 2014103216309 | – | – | – |
| CN20141321630 | – | – | – |
| PCTCN2015071278 | – | – | – |
| WO2015CN71278 | – | – | – |
Members19
| Document | Office | Kind | |
|---|---|---|---|
| CN104052077A | China | A | |
| WO2016000446A1 | World Intellectual Property Organization (WIPO) | A1 | |
| CN104052077B | China | B | |
| KR20160132818A | Republic of Korea | A | |
| EP3136534A1 | European Patent Office (EPO) | A1 | |
| PH12016502427A1 | Philippines | A1 | |
| PH12016502427B1 | Philippines | B1 | |
| MX2016015968A | Mexico | A | |
| EP3136534A4 | European Patent Office (EPO) | A4 | |
| US2017163158A1 | United States of America | A1 | |
| US9768696B2 | United States of America | B2 | |
| BR112016021373A2 | Brazil | A2 | |
| MX356241BThis record | Mexico | B | |
| KR20180052766A | Republic of Korea | A | |
| RU2661901C1 | Russian Federation | C1 | |
| PH12016502427B1 | Philippines | B1 | |
| KR101972560B1 | Republic of Korea | B1 | |
| MY178272A | Malaysia | A | |
| BR112016021373B1 | Brazil | B1 |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Grant or registrationFG | FG |
Numbers
- Publication
- 356241
- Publication, DOCDB
- 356241
- Publication, EPODOC
- MX356241
- Application
- 2016015968
- Application, DOCDB
- 2016015968
- Application, EPODOC
- MX20160015968
Titles2
- Spanish
- METODO DE CONTROL DE FRECUENCIA DEL LADO INVERSOR PARA TRANSMISION DE CORRIENTE CONTINUA.
- English
- DIRECT-CURRENT TRANSMISSION INVERSION-SIDE FREQUENCY CONTROL METHOD.
Classification
- CPC, 14
- H02J3/36
- H02M3/24
- Y02E60/60
- H02J2003/365
- H02J3/48
- H02J3/00142
- H02H3/46
- H02M7/757
- H02M7/758
- H02M5/42
- H02M5/45
- H02M5/451
- H02M5/458
- H02M7/7575
- IPC, 6
- H02M5 45
- H02M3 24
- H02M5 42
- H02M5 451
- H02M5 458
- H02M7 757