磁控式并联电抗器容量调节暂态过程及其对匝间保护的影响  

Power Regulation Transient Process of Magnetically Controlled Shunt Reactor and Its Impact on Protection against Turn-to-Turn Faults

作　　者：郑涛 刘校销 Zheng Tao;Liu Xiaoxiao(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Source North China Electric Power University,Beijing 102206 China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电工技术学报》2021年第5期1052-1063,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51677069)。

摘　　要：磁控式并联电抗器(MCSR)可实现无功功率的大范围平滑调节,但现有研究中MCSR容量调节暂态特性及其对保护的影响尚不清晰。因此,该文对MCSR容量调节过程展开研究,首先分析了磁控式并联电抗器的稳态运行特性,引入磁饱和度概念,在此基础上,对其容量调节暂态过程特性展开讨论。调容暂态过程中,由于心柱间磁饱和度的差异,三相控制绕组电流及控制绕组总电流的基波分量将会增加,导致基于控制绕组总电流基波分量的匝间保护误动。为解决该问题,根据MCSR调容过程中三相控制绕组电流基波分量平均值近似相等的特点,利用三相控制绕组电流基波分量差异度,可以准确识别出容量调节过程,从而有效解决了MCSR容量调节过程中匝间保护误动的问题。基于Matlab/Simulink的仿真及1.5kV MCSR样品的动模实验,验证了所提方案的正确性。Magnetically controlled shunt reactor(MCSR)can smoothly regulate its reactive power in a large scale.However,the transient characteristic during power regulation and its impact on the protection of MCSR have not been researched.This paper focuses on the analysis transient process of power regulation of MCSR.Firstly,the steady-state operation characteristics of MCSR are analyzed,where the magnetic saturation concept is introduced.On this basis,the transient process of power regulation and its feature are discussed.During the transient process,due to the difference of magnetic saturation between the limbs,the fundamental frequency component of the control winding current and total control current increase,which may cause a mal-operation of protection against turn-to-turn faults based on the fundamental frequency component of the total control current.According to the characteristics that the fundamental frequency components of the three-phase control windings are approximately equal during the power regulation process,the process can be identified and the possible mal-operations can also be avoided.Based on simulation based on Matlab/Simulink and experimental results,the correctness of the proposed scheme is verified.

关 键 词：磁控式并联电抗器 容量调节 磁饱和度 控制绕组电流 匝间保护 

分 类 号：TM474[电气工程—电器]