Patent ID: 7755333

Claim:
A power system control apparatus comprising: a static var compensator connected to a bus of a substation in a power system, and compensating an amount of reactive power according to fluctuations in bus voltage; a first phase lead capacitor connected to said bus via a first circuit breaker in parallel with said static var compensator; a first phase lag reactor connected to said bus via a second circuit breaker in parallel with said static var compensator; a first bus voltage detector detecting said bus voltage; a reactive power compensation control section adjusting the amount of reactive power compensated by said static var compensator according to said detected bus voltage; a cooperative control section outputting control commands for opening and closing said first and second circuit breakers to effect compensation of the amount of phase lead reactive power of said first phase lead capacitor or compensation of the amount of phase lag reactive power of said first phase lag reactor, when said detected bus voltage exceeds a predetermined voltage fluctuation range set beforehand, and an output lock section locking the output of said control commands of said cooperative control section, when said detected bus voltage is lower than a predetermined threshold voltage set lower than a lower limit value of said predetermined voltage fluctuation range.