| 摘要 |
A power-factor correction system for reactive power control and concomitant power factor correction adapted to cooperate with a line supplying power at a given line voltage from a power generator to an inductive load via a given path, includes a reactive power compensating device in shunt with the line supplying power, and is adapted to be connected in shunt with the inductive load. The reactive power compensating device, in turn, includes a fixed capacitance and a voltage applying circuit delivering a voltage of continuously variable magnitude in a stepless manner to the fixed capacitance in response to any change in lagging reactive power consumed by the load, so as to correct the magnitude of the power factor in the line supplying power to the inductive load to a sensed optimum correction value, as a result of the power compensating device generating thereacross a resulting compensating reactive power in proportion to the square of the voltage of variable magnitude delivered to the fixed capacitance so as to at least partly off-set the lagging reactive power, whereby power factor correction is optimized, yet does not produce any transient. The power-factor correction system is further capable of regulating the magnitude of the compensating reactive power to achieve optimization for line voltages having waveforms deformed from a sinusoid of the fundamental frequency and for non-linear loads. The system is also arranged to prevent destructive series resonance between a transmission line and the fixed capacitance.
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