| 摘要 |
A voltage regulator regulates the voltage a static VAR compensator (SVC) supplies to a power supply network. An SVC status detector detects the conducting status of the SVC thyristors and generates the measured SVC susceptance in accordance with that conduction status. A calculator calculates a representative voltage, (i.e. the Thevenin equivalent), of the power supply network based on the measured SVC susceptance, measured SVC voltage, and an estimate of the power supply network's equivalent reactance. An ordered susceptance to be provided by the SVC to maintain the SVC voltage at a desired level is predicted based on the calculated voltage. A firing control unit receives the predicted susceptance value and calculates drive signals for controlling thyristors in the SVC. The equivalent reactance is initially estimated, and thereafter, it is modified automatically to track and compensate for large disturbances in the power transmission network. The modification is determined based on changes in the calculated representative voltage and in the measured SVC susceptance. The equivalent reactance is varied until the changes in the calculated representative voltage and measured SVC susceptance are substantially reduced to zero. This Thevenin-based approach to modelling the power supply network from the perspective of the SVC permits predictive SVC voltage regulation that is sensitive, accurate, and stable.
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