Anti-surge Driving Strategy Based on the Hybrid Thyristor-controlled Phase-shifting Transformer
The Thyristor-Controlled Phase Shifting Transformer(TCPST)holds significant prospects in the increasingly complex power grid flow control due to its reliable load regulation and cost-effectiveness.However,the semi-controlled characteristics of thyristors introduce the possibility of coil short-circuit-induced current surges during mode switching,restricting the widespread engineering application of TCPST.This paper first proposes a hybrid TCPST based on a novel matrix direct AC-AC conversion topology to address this issue.Then,an anti-surge driving strategy is introduced for mode switching based on the hybrid TCPST topology:a locking driving strategy that combines valve current direction and operating mode to address the current surge issues induced by coil short-circuit during mode switching.Additionally,an RC buffer circuit is added within the valve assembly,and a power reference threshold is introduced in the driving strategy to mitigate the associated valve assembly momentary open-circuit voltage surge issues.Finally,simulations are conducted on a 220kV grid environment with the hybrid TCPST,confirming the effectiveness of the proposed anti-surge driving strategy.
TCPSTwinding short-circuitvalve current directionpower reference thresholddriving strategy
万方数据
维普
