Electricity: power supply or regulation systems – For reactive power control – Using impedance
Patent
1993-04-13
1995-06-13
Gaffin, Jeffrey A.
Electricity: power supply or regulation systems
For reactive power control
Using impedance
307102, G05F 100
Patent
active
054246270
ABSTRACT:
A modular 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. The TCSC system promptly responds to an offset command from a higher-level controller to control bypass thyristor duty to minimize thyristor damage, and to prevent capacitor voltage drift during line current disturbances. In a multi-module TCSC system, the higher level controller accommodates competing objectives of various system demands, including minimizing losses in scheduling control, stabilizing transients, damping subsynchronous resonance (SSR) oscillations, damping direct current (DC) offset, and damping power-swings.
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Clark Kara
Larsen Einar V.
Piwko Richard J.
Wegner Carl A.
Electric Power Research Institute
Gaffin Jeffrey A.
Ganjoo Peter
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