PROBLEM TO BE SOLVED: To provide an economically excellent control method for sustaining balanced supply-demand state even for output variation of a power generation facility or for abrupt variation in load by suppressing variation width in the power supply system.;SOLUTION: A power supply facility 12 connected with a power system 11 comprises a power generation facility 1 utilizing natural energy, and the like, and involving variation in generated power, and a power generation facility 2 performing base power generation and having a double power supply synchronous generator including a motor 3 and a variable frequency converter 5 driven by the motor 3. Total power generation value of the power generation facilities 1 and 2 is sustained at a predetermined value by inputting at least any one of signals indicative of the total power generation value of the power generation facilities 1 and 2 in the power supply facility 12 and the power flow of a line linking with the power system 11 to the power generation facility 2 as a control signal and varying output of the power generation facility 2 depending on variation in control signal by excitation control or motor control.;COPYRIGHT: (C)2007,JPO&INPIT
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