Electrical transmission or interconnection systems – Stabilized – anti-hunting or antioscillation systems
Patent
1991-12-13
1993-04-13
Stephen, Steven L.
Electrical transmission or interconnection systems
Stabilized, anti-hunting or antioscillation systems
323211, 361107, H02H 900
Patent
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.
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Clark Kara
Larsen Einar V.
Electric Power Research Institute
Stephen Steven L.
Sterrett Jeffrey
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