Reactive power regulator

Abstract

Abstract PURPOSE: To prevent the DC polarization of a transformer from being generated, by suppressing pulsation corresponding to the fundamental wave of an AC power source which is included in DC voltage. CONSTITUTION: To a DC voltage reference arithmetic circuit 82, the input of the effective value VSY of system voltage detected by a system voltage effective-value detector 70, reactive power reference signal QR for output generated from a Q reference setting circuit 81, and a phase angle ϕ for output generated from a control compensating circuit 84 is provided, and based on an equation, a DC voltage reference VDCR is computed. By an adder circuit 83, a difference between DC voltage signal VDC detected by a DC voltage detector 50 and the DC voltage reference VDCR is set, and the input of this difference signal to the control compensating circuit 84 is provided, and the control compensating arithmetic of proportional integration arithmetic or the like is performed, and after that, the phase angle ϕ is computed and the input to a single- phase controlling circuit 85 is provided. Then, the output of signal determining the conduction period of respective controllable rectifying elements in an inverter 10 is generated. As a result, pulsation is suppressed by the frequency of the fundamental wave of the AC voltage of a system 100 through the DC voltage of an inverter main- circuit, and DC polarization is prevented from being generated on a systematic reactor 30 and a systematic transformer 40. COPYRIGHT: (C)1989,JPO&Japio

Inventors

• 👤 Shunichi Hirose

Bibliographic Details