有源滤波器建模与控制策略研究

摘要

Improvement of active power filter's performance through the reasonable control strategy is becoming a hot research for various counties' scholars.In this paper,active power filter model is regarded as a starting point and the modeling process has been introduced in detail.For the following characteristics,such as harmonic current detection must be real-time and accurate,active power filter's uncertainty and nonlinear,the harmonic current detection method which is based on instantaneous reactive power is used.In this way,harmonic current,reactive and negative sequence current in grid can be accurately tested out.The active power filter which is developed according to this current real-time detection algorithm can balance asymmetrical three-phase load.The simulation model is built in MATLAB/simulink.The simulation results show that this active power filter can be more rapid,accurate compensate harmonic current than the conventional active power filter.%合理利用有效的控制策略提高有源滤波器的本身的补偿性能越来越成为各国学者研究重点.本文从有源滤波器的数学模型出发,详述有源滤波器的数学建模过程.并且针对谐波电流的检测需要较高的准确度和较好的实时性以及有源滤波器工作时的非线性与不确定性的特点,基于瞬时无功功率补偿法的谐波电流检测方法.有效的计算出电网中谐波电流、无功以及负序电流.并根据该算法的特点,将实时检测出的畸变电流通过控制算法,研制的有源滤波器可对不对称三相负载起到平衡作用.在MATLAB/simulink平台下搭建仿真模型,与传统的有源滤波器进行对比,仿真结果表明这种有源滤波器能够更加迅速、精确的补偿谐波电流.