Power controller

(57) summary power control (10), A bidirectional power converter (14, 16, 22) constitutes the distributed power generation type electric power network system used with common DC bus (24) which enables it to take various compatibility between energy components (12, 18, 20). Each power converter operates as a bidirectional (customized) change converter of the special order essentially constituted so that it might become an interface of the specific energy component to DC bus under control of a power converter. Power control controls the method of electric power absorption of each energy component at the arbitrary times, or discharge, and the method of adjustment of DC bus. If it does in this way, supply of electric power, storage, and (or) use can be efficiently performed using various energy components. As various energy components, an energy source, load, storage equipment, and such combination are mentioned.