| 摘要 |
PURPOSE:To improve reactive power compensating accuracy without affecting a reactive power detecting function with a higher harmonic generated by a rectifier by using the DC current, the control angle and the control voltage signal of the rectifier, detecting a basic wave reactive power only consumed by the rectifier and compensating the power. CONSTITUTION:A thyristor rectifier 22 is phase-controlled so that a DC current Id can be kept constant with a control circuit 30. A reactive power arithmetic circuit 15 operates the basic wave reactive power consumed with a fluctuating load 21 by the DC current Id, the control angle of a rectifier and an alternating power source system voltage. Consequently, the thyristor of a reactive power compensating device is phase-controlled by a function generator 12, a comparator 13 and a pulse amplifying circuit 14. In such a way, without being influenced by the higher harmonic generated by the rectifier, the highly accurate reactive power compensation can be attained. |
