基于可控电抗器的自动多调谐滤波器仿真研究

Research on Auto-tuned Harmonic Filter based on Controllable Reactor

利用单条LC串联支路抑制多次谐波是构成一种新的调谐滤波器的设想,是通过调节可控电抗器补偿绕组中的谐波磁通电流,连续调节电抗器在不同谐波频率下的电感量,达到消除失谐和抑制多次谐波的目的。在Ansoft中建立了可控电抗器有限元仿真模型,分析了电抗器的工作特性;并且应用Matlab Simulink建立了自动调谐滤波器滤波实验的仿真模型,验证了滤波器的补偿调谐性能和多调谐滤波作用。同时分析也表明,滤除低次谐波比滤除高次谐波需增加更大的谐波控制电流。因此在设计这种单支路多调谐滤波器的可控电抗器主电抗时,应以滤除最低频率的电感量为主电感设计值,实际能考虑的支路数也不宜太多。

An auto-tuning filter to check multiple harmonics by a single LC series branch is a novel conceive.It can filter multiple harmonics by regulating the harmonics current injecting into the compensation winding of the controllable reactor,of which inductance at different harmonic frequencies can be independently and continuously adjusted.The controllable reactor model is founded in Ansoft,and its characteristic are analyzed.The model of auto-tuning harmonic filter is also built by Matlab Simulink to simulate its effect and the multi-tuning function.The results not only show that this filter can suppress multiple dominant harmonics simultaneously and eliminate the detuning effectively,but also show that suppressing low harmonics need larger controlled current than suppressing high harmonics.Thenfore to filter the lowest frequency is the design standard for controllable reactor＇s main inductance,single branch multi-tuning filter and harmonics times shall not be considered too much.