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Application of thyristor controlled phase shifting transformer excitation impedance switching control to suppress short-circuit fault current level 被引量:14
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作者 Jun LIU Xudong HAO +3 位作者 Xu WANG Yefu CHEN wanliang fang Shuanbao NIU 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2018年第4期821-832,共12页
Short-circuit fault current suppression is a very important issue in modern large-interconnected power networks. Conventional short-circuit current limiters, such as superconducting fault current limiters, have to inc... Short-circuit fault current suppression is a very important issue in modern large-interconnected power networks. Conventional short-circuit current limiters, such as superconducting fault current limiters, have to increase additional equipment investments. Fast power electronics controlled flexible AC transmission system(FACTS)devices have opened a new way for suppressing the fault current levels, while maintaining their normal functionalities for steady-state and transient power system operation and control. Thyristor controlled phase shifting transformer(TCPST) is a beneficial FACTS device in modern power systems, which is capable of regulating regional powerflow. The mathematical model for TCPST under different operation modes is firstly investigated in this study. Intuitively, the phase shifting angle control can adjust the equivalent impedance of TCPST, but the effect has been demonstrated to be weak. Therefore, a novel transformer excitation impedance switching(EIS) control method, is proposed for fault current suppressing, according to the impedance characteristics of TCPST. Simulation results on IEEE 14-bus system have shown considerable current limiting characteristic of the EIS control under various fault types. Also, analysis of the timing requirement during fault interruption, overvoltage phenomenon, and ancillary mechanical support issues during EIS control is discussed,so as to implement the proposed EIS control properly for fast fault current suppression. 展开更多
关键词 Excitation impedance switching(EIS) CONTROL INTERRUPTION time sequence PHASE SHIFTING angle(PSA) CONTROL SHORT-CIRCUIT fault current suppression Thyristorcontrolled PHASE SHIFTING transformer(TCPST)
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