| 摘要 |
PURPOSE:To prevent the bad influence from exerting upon a power generation system by taking the variation of a compensating reactive power value due to the variance of an AC voltage of a bus into consideration to exercise a high- precision reactive power compensating control in case of the variance of the AC voltage. CONSTITUTION:A converting circuit 50 is connected to an AC bus 11, which is connected to an AC power supply system 10, AC-DC converters 9a and 9b, and plural parallel capacitors SC1-SC3, through an AC voltage transformer 12. A DC voltage proportional to the input voltage converted by this circuit 50 is inputted to a function generator 65, and a deviation between the output of the generator 65 and an effective compensating capacity Q1 is obtained by an adder 60. Meanwhile, a reactive power value QD of capacitors SC1-SC3 is calculated by a required reactive power detecting circuit 70, and the output of the adder 60 and the power value QD are applied to an operation command discriminating circuit 80 through an adder 75. The output of the adder 60 and the power value QD are compared with each other by the circuit 80, and the output is applied to an SC control circuit 85 to perform a high-precision reactive power compensation in case of the variance of the AC voltage. |
