LCL型三相四线制APF的准比例谐振控制研究

Research on Quasi-proportional Resonance Control of LCL Three-phase Four-wire APF

配电网智能化的关键在于利用有源电力滤波器(APF)综合控制电能质量。通过研究分析APF的结构及其原理,建立等效电路模型,简化电流检测,不需要分离正负序电流,也不需要提取无功电流和各次谐波电流,即可获得指令电流。基于准比例谐振(PR)控制,实现对各种频率分量协调控制,分析无源阻尼法中各增阻尼方式,综合考虑各阻尼放置位置对LCL型滤波器滤波性能及功率损耗带来的影响,选择最优化方式且选取合适的阻尼值,控制LCL型滤波器来抑制高频谐波,补偿配电网中无功电流、负序电流、零序电流及高次谐波电流。

The key to intelligent distribution network lies in the use of active power filter(APF)to comprehensively control power quality.Through research and analysis of the structure and principles of APF,the establishment of an equivalent circuit model to simplify current detection,without the need to separate the positive and negative sequence currents,and without the need to extract reactive current and harmonic currents,this can get instructions current.Based on quasi-proportional resonant(PR)control,to achieve coordinated control of the frequency components of each clock,and to analyze the various damping methods in the passive damping method.By comprehensively considering the impact of each damping position on the filter performance and power loss of the filter,the optimal method and appropriate damping value are selected,and the LCL filter is controlled to suppress high-frequency harmonics.So as to achieve the purpose of compensating reactive current,negative sequence current,zero sequence current and higher harmonic current in the distribution network.