Thyristor controlled series capacitor vernier control system

Electrical transmission or interconnection systems – Stabilized – anti-hunting or antioscillation systems

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323211, 361107, H02H 900

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active

052025837

ABSTRACT:
A firing control scheme, including a method and apparatus, for secure vernier operation of a thyristor controlled series capacitor (TCSC) in series with a transmission line uses phase controlled firing based on monitored capacitor voltage and line current. The TCSC system has a thyristor switched inductive commutating circuit in parallel with the series capacitor. Vernier operation of the TCSC system is provided by predicting an upcoming firing angle for switching the commutating circuit to conduct a thyristor bypass current pulse therethrough. The current pulse causes an alternating offset component of voltage to appear across the series capacitor, in addition to the normal voltage component. Each current pulse changes the capacitor voltage proportionally to the integrated value of the current pulse. The TCSC system promptly responds to an offset command from a higher-level controller, precisely controls the duty on the bypass thyristors to minimize thyristor damage, and prevents drift of the capacitor voltage away from a desired setting during line current disturbances.

REFERENCES:
patent: 4188573 (1980-02-01), Gyugyi et al.
patent: 4292545 (1981-09-01), Hingorani
patent: 4302715 (1981-11-01), Putman et al.
patent: 4311253 (1982-01-01), Putman et al.
patent: 4355241 (1982-10-01), Hingorani
patent: 4434376 (1984-02-01), Hingorani
patent: 4724333 (1988-02-01), Hedin
patent: 4808843 (1989-02-01), Hedin
patent: 4811236 (1989-03-01), Brenner et al.
patent: 4999565 (1991-03-01), Nilsson
patent: 5032738 (1991-07-01), Vithayathil
patent: 5121048 (1992-06-01), Larson
Christl, et al., "Advanced Series Compensation with Variable Impedance," presented at EPRI FACTS Workshop, Cincinnati, Ohio, Nov. 14, 1990.
Vithayathil, et al., "Case Studies of Conventional and Novel Methods of Reactive Power Control on an AC Transmission System," CIGRE paper for SC 38-02, Paris, Sep. 1988.

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