Reactive-power compensator for compensating a reactive-current c

Details Reactive-power compensator for compensating a reactive-current c Reactive-power compensator for compensating a reactive-current c

1984-10-02

1987-03-03

Shaw, Clifford C.

Electricity: power supply or regulation systems

For reactive power control

Using converter

363 41, H02J 318

Patent

active

046478370

ABSTRACT:
A reactive-power compensator for compensating a reactive current component in an alternating-voltage system, including a reactive-current converter formed by forced-commutation current converter rectifiers arranged in a current converter bridge circuit, and a smoothing choke used as a termination at the direct-current side of the bridge circuit. The compensator attains constant compensation of both inductive and capactive reactive-current components with clearly reduced system reaction by driving the rectifiers such that the bridge circuit accepts at its input a compensation current in the form of approximately rectangular current pulses having a pulse frequency greater than that of the alternating voltage system. The polarity and width of these current pulses are modulated in accordance with a sine function so that the compensation current is identical in frequency and amplitude with respect to the reactive current component at the system voltage input, but shifted in phase by 180.degree..

REFERENCES:
patent: 3959719 (1976-05-01), Espelage
patent: 3959720 (1976-05-01), Bose et al.
patent: 4019124 (1977-04-01), Motgen
F. Harashima et al., "A Closed-Loop Control System for the Reduction of Reactive Power Required by Electronic Converters", IEEE Transactions on Industrial Electronics & Control Instrumentation, May, 1976, pp. 162-166.
Gyugyi "Reactive Power Generation & Control by Thyristor Circuits", IEEE Transactions on Industry Applications, Sep./Oct. 1979, pp. 521-532.

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