Electricity: power supply or regulation systems – For reactive power control – Using saturable inductor
Patent
1986-08-19
1987-07-14
Wong, Peter S.
Electricity: power supply or regulation systems
For reactive power control
Using saturable inductor
323210, G05F 170
Patent
active
046805311
ABSTRACT:
A method for attenuating at least one unwanted harmonic, particularly the second harmonic, with respect to the system frequency in a multi-phase alternating current system, wherein an additional stabilizing circuit is installed into a conventional current/voltage controller including a current/voltage controller and a three-phase firing pulse generator in a reactive-power compensator connected via a reactive-power transformer and a current transformer to a 50 Hz three-phase system. The reactive power compensator has for each phase of the three-phase current at least one air choke, which is connected via a current transformer and via an alternating-current switch via another sum-current transformer to a secondary winding of the reactive-power transformer. In addition, the reactive-power compensator has for each phase of the three-phase current at least one capacitor bank or a capacitor, which is connected via a current transformer and an alternating-current switch (13) to the sum-current transformer (20). The stabilizing circuit measures a harmonic-containing magnetising current as the difference between compensator current (i.sub.K) and sum current (i.sub.Su) on the primary and secondary side of the reactive-power transformer, and by means of a voltage transformer a system-frequency voltage signal, which is proportional to the system frequency. These two three-phase current and voltage signals are converted into a single direct-voltage signal in a reactive-power meter. An input harmonic of 100 Hz occurs on the output side as a 50 Hz signal which is filtered out in a bandpass filter and, after a +90.degree. phase shift, is added in an adding section to the conventional output signal of the current/voltage controller via a double-sided limiter.
REFERENCES:
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Fiebiger et al., "Thyristor Static Compensator for the Cern Intermediate Booster Accelerator", ACEC Rev. (Belgium), No. 3 (1980), pp. 2-6.
H. E. Schweickardt et al., Closed Loop Control of Static Var Sources (SVS) on EHV Transmission Lines, 11/15/77.
P. V. Goosen et al., FC/TCR Type Static Compensators in Escom's 132 kV Network, 1984 Session-29th Aug.-6th Sep.
Rey Antoine
Stemmler Herbert
BBC Brown Boveri & Company Limited
Wong Peter S.
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