三相对称系统中SVC-MERS注入谐波电流分析

Analysis of Current Harmonics of SVC-MERS in Three-phase Symmetrical Power System

磁能恢复开关MERS(magnetic energy recovery switch)是一种新型的无功补偿装置,它相较于其他无功补偿装置,具有结构简单、易于控制和损耗低等诸多优点,但在进行无功功率补偿的过程中会产生谐波电流。首先,在对MERS的结构和控制方法阐述的基础上建立了三相对称系统中SVC-MERS的数学模型,讨论分析了控制参数对三相对称系统中线电流谐波特性的影响;进而提出了控制参数的优化设计方法。仿真和实验结果表明,通过控制参数的优化设计可以有效地减小三相对称系统中线电流的谐波含量,所提控制参数的优化设计方法是可行的。

Magnetic energy recovery switch（MERS） has been proposed as a new reactive power compensator. Compared with other reactive power compensation devices, it has many advantages, such as simple structure, easy to control and low loss. But MERS produce harmonic current in the process of reactive power compensation. Firstly, the configuration of MERS and the operating principles of MERS are described in the paper. Secondly, the electrical model of SVCMERS in three-phase symmetrical power system is described using analytical equations. Then, the effect of the control variables on current harmonics are analysed and the optimal combination of control variables are established. simulation and test are presented to verify the result.