Power supply and demand control apparatus and power supply and demand control method

A power supply and demand control apparatus which adjusts power outputs of distributed power sources having adjustable power outputs out of a plurality of distributed power sources connected in a power system to thereby keep deviations between total power output and load power of the distributed power sources in the power system constant, the power supply and demand control apparatus comprising:

• a power generation planning unit that calculates one day's power output of each of the distributed power sources and a target for electric power flow at an electric power flow measuring location set arbitrarily;
• a first control unit that generates a control signal used to make the deviations between the total power output and the load power constant;
• and
• a second control unit that generates a control signal used to perform control for making the deviations between the total power output and the load power constant on a shorter cycle than a control cycle of the first control unit,
• wherein the first control unit comprises:
• a first supply-demand balancing control unit that corrects the electric power flow target calculated by the power generation planning unit so as to eliminate the deviations between the total power output of the distributed power sources and the load power in the power system to thereby ensure supply-demand balancing of electric energy in a given amount of time at the electric power flow measuring location,
• a load power estimating unit that estimates the load power,
• a non-variable output estimating unit that estimates power output of a non-variable output power source having power output not adjustable out of the distributed power sources installed in the power system,
• a power requirement calculating unit that calculates a required value of the total power output based on a target value of the electric power flow corrected by the first supply-demand balancing control unit, an estimated load power value produced by the load power estimating unit and an estimated power output value of the non-variable output power source produced by the non-variable output estimating unit, and
• an economical load dispatching (ELD) unit that determines economical load dispatching based on the required value of the total power output calculated by the power requirement calculating unit and produces respective power output command values for the plurality of distributed power sources;
• and
• the second control unit comprises:
• a second supply-demand balancing control unit that corrects and outputs the electric power flow target corrected by the first supply-demand balancing control unit so as to eliminate the deviations between the total power output of the distributed power sources and the load power of the power system and ensure the supply-demand balancing in a period shorter than a supply-demand balancing period ensured by the first supply-demand balancing control unit, and
• a short-cycle output assignment unit that allocates control amounts requested by the second supply-demand balancing control unit among the distributed power sources having the adjustable outputs.