Electrical transmission or interconnection systems – Stabilized – anti-hunting or antioscillation systems
Patent
1993-04-13
1994-12-20
Stearrett, Jeffrey L.
Electrical transmission or interconnection systems
Stabilized, anti-hunting or antioscillation systems
323211, 361107, H02H 900
Patent
active
053748530
ABSTRACT:
A thyristor controlled series capacitor (TCSC) system, including a method and apparatus, uses phase controlled firing based on monitored capacitor voltage and line current. For vernier operation, the TCSC system predicts an upcoming firing angle for switching a thyristor controlled commutating circuit to bypass line current around a series capacitor. Each bypass current pulse changes the capacitor voltage proportionally to the integrated value of the current pulse. To damp the natural oscillatory response of the inductive commutating circuit and the capacitor, a bypass mode firing angle is introduced to create a nonlinear response. The harmonic distortion on the commutating circuit current waveform is determined from the capacitor voltage, which is then used to determine the magnitude of the firing angle. Preferably the firing angle magnitude decreases in response to decreasing capacitor voltage, eventually returning to steady-state conditions.
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Clark Kara
Eitzmann Murray A.
Larsen Einar V.
Nyati Sandeep
Urbanek Josef
Electric Power Research, Inc.
Stearrett Jeffrey L.
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