磁控电抗器在右江500kV线路中的应用

我国超高压输电线路中普遍安装的固定高压并联电抗器显著地制约了传输功率,使线路电压过分降低。而磁控电抗器能平滑调节无功容量,抑制操作过电压和限制单相故障时引起的潜供电流。对磁控电抗器取代常规并联电抗器应用于三右—江陵500kV输电线路进行了研究,介绍了磁控电抗器的结构和基本工作原理,建立了磁控电抗器模型并在此基础上着重分析了磁控电抗器的特性。利用仿真验证了磁控电抗器应用于三右—江陵500kV线路抑制操作过电压和限制潜供电流的效果,以及磁控电抗器应用于超高压输电线路的可行性和有效性。

Application of Magnetically Controlled Reactor in 500 kV Transmission Line from Sanyou to Jiangling

Fixed shunt reactors applied in Extra-high voltage transmission lines restrict transmitted power significantly and cause low voltage excessively.A proposition is brought forward to solve these problems by adopting magnetically controlled reactor(MCR).Magnetically controlled reactor instead of traditional fixed shunt reactor in 500 kV transmission line from Sanyou to Jiangling is studied.MCR has the capabilities of smooth voltage and reactive power regulation,switching overvoltage suppression,secondary arc current limitation during single-phase fault reclosing.Structure and essential working principle of MCR are presented in detail.Based on Electromagnetic Transient Program(EMTP),simulation models of MCR and transmission line are built up.The characteristics are analyzed successively,such as the harmonic distribution characteristic,voltage-current characteristic,control characteristic and response time.Simulation has been performed to verify the effect of suppressing switching overvoltage and limiting secondary arc current.The results show that in addition of smooth voltage and reactive power regulation MCR can also perform the same functions as those with conventional fixed reactor,and demonstrate the feasibility and effectiveness of MCR application to suppress overvoltage and limit secondary arc current in Extra-high voltage transmission line.