APF铁心电抗器的直流偏磁现象及其优化设计

DC Magnetic Bias and Improved Design of Iron-core Reactor in APF

有源电力滤波器(APF)中耦合铁心电抗器的参数对于整体装置的工作性能有较大影响,在此针对APF装置中的铁心电抗相关问题进行了分析研究,指出装置实际工作过程中的各类因素会使得输出电流中含有直流分量,从而使铁心产生直流偏磁现象,并且以三相四线制APF为例进行了仿真分析,指出直流偏磁所产生的影响。最后从不同方面介绍了几种相应的改善方法,并以三相铁抗为例对改善效果进行了实验验证。

This paper discusses the issues of iron-core parallel reactor in APF, and points out that the phenomenon of DC magnetic bias will occur by dc component in output current.This phenomenon is expressed in detail by theoretical analysis and has been simulated on three-phase four-wire parallel APF under Matlab environment, with or without DC magnetic bias.The results show that DC magnetic bias is the main cause of even harmonic and furthermore affects the APF filtering performance.Some kinds of optimization method are proposed, and experiments with three-phase ironcore reactor prove the effect.