AVC系统晶闸管与SF6开关电容投切技术研究  

Research on Switching Technology of Thyristor and SF6 Switch Capacitor in AVC System

作　　者：王灿霞 成佳 肖霞 孙晶 WANG Canxia;CHNEG Jia;XIAO Xia;SUN Jing(College of Electrical Engineering & New Energy,China Three Gorge University,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院

出　　处：《电子科技》2019年第6期49-53,57,共6页Electronic Science and Technology

基　　金：国家自然科学基金(51507091);三峡大学学位论文培优基金(2018SSPY079)~~

摘　　要：随着AVC系统的投运,变电站内电容器投切更加频繁。传统补偿电容器的SF6开关投切频率低,难以满足投切间隙中出现的无功补偿需求,限制了电容器的作用。为了解决上述问题,文中提出了一种复合开关结构。该结构将机械投切和电子开关投切相结合,构成晶闸管+SF6开关的组合式投切方案。文中对晶闸管+SF6开关投切电容器的工作原理进行了介绍,并分析了开关控制策略。通过合理的投切策略可以实现晶闸管和SF6开关的相互保护,使晶闸管阻断时避免承受高电压,也避免了SF6开关在高频投切的情况下频繁动作,延长设备使用寿命。最后,通过PSIM软件仿真验证了该复合开关的合理性和可行性。With the commissioning of the AVC system, the switching of the capacitor in the substation was more frequent. The conventional switching capacitor SF6 switching frequency is low, and it fails to meet the reactive power compensation requirements in the switching gap, limiting the role of the capacitor. In order to solve the above problems, a compound switch structure was proposed, which combined mechanical switching and electronic switching to form a combined switching scheme of thyristor and SF6 switch. The working principle of thyristor & SF6 switching capacitor was introduced and the switch control strategy was analyzed in this paper. Through a reasonable switching strategy, mutual protection of the thyristor and the SF6 switch was realized, so that the thyristor could withstand high voltage when blocked, and also avoided frequent operation of the SF6 switch in the case of high-frequency switching, thereby prolonging the service life of the device. Finally, the rationality and feasibility of the compound switch were verified by PSIM software simulation.

关 键 词：AVC系统 TSC SF6开关 PSIM 补偿电容器 投切频率 

分 类 号：TN710[电子电信—电路与系统]