基于网侧绕组串联的磁控式可控高抗控制绕组结构改进

将单相磁控式可控高抗(MCSR)网侧分支绕组由并联改为串联结构能有效提升响应速度,但若直接将该方法应用于三相MCSR会造成主磁通严重畸变。基于传统三相MCSR的结构及工作原理,深入分析了直接将网侧绕组由并联改为串联后的MCSR各绕组电流和铁芯磁通的变化特征,揭示了主磁通畸变的原因在于没有偶次励磁电流通路。基于此提出了"两串三并式"控制绕组结构改进方案,在不改变各相控制绕组直流偏磁特性的前提下构造出了偶次励磁电流通路,将快速响应的单相MCSR结构推广至三相MCSR,数字仿真和动模实验验证了理论的正确性。

Physical Design of Control Windings for a Three-phase Magnetically Controlled Shunt Reactor Based on Series-connected Working Windings

Changing the working winding configuration of a single-phase magnetically controlled shunt reactor (MCSR) from parallel-connection to series-connection can effectively improve the responding speed of an MCSR. Direct application of this method to a three-phase MCSR, however, would cause serious distortion of the flux in the main cores. By introducing the configuration and operating principle of a traditional three-phase MCSR, this paper analyses the features of the current for each winding and the main flux based on the MCSR structure of series-connected working winding. It is proved that the distortion of main flux is caused by lack of even harmonic excitation current. A new physical design for the control windings of a three-phase MCSR is proposed which creates paths for even harmonic excitation current while keeping dc bias for each control winding unchanged. The fast responding single-phase MCSR structure is successfully applied to three-phase MCSR, verifying theoretical analysis with simulation and test results. This work is supported by National High Technology Research and Development Program of China (863 Program) (No. 2012AA050208) and Fundamental Research Funds for the Central Universities (No. 2014MS06).