负载电流检测型有源滤波器新的控制策略

New control strategy of shunt active power filter based on load current detection

为了解决目前常见的有源滤波嚣在高放大倍数时稳定性差或者只能补偿谐波不能补偿无功的情况的问题。通过对目前常见的控制方法的研究,提出了一种新的基于负载谐波电流检测,把逆变器控制成受控电压源的控制策略,在补偿谐波的同时对无功电流进行补偿。将该控制筑略搭建成Matlab模型进行仿真,仿真结果表明该控制策略具有较好的滤波效果和动态无功补偿能力。依据该控制策略研制了一台容量为10 kVA的三相三线制并联型有源滤波器样机,在现实应用最广泛的不控整流带阻感负载工况下进行试验。实验数据显示谐波补偿率在90%以上,且在负载突变时动态响应时间在一个基波周期以内。体现了该控制策略的优越性。

In order to improve poor seability and the situation that can solve harmonic compensation but can not solve reactive power of active power filter in high magnification, based on the research of the common control methods, a new control strategy of load current detection was proposed by analyzing the popular control strategy of shunt active power filter（SAPF）.The approach makes the inverter as a controlled voltage source and the SAPF compensates both harmonics and reactive power. According to them, a simulation model was built, and the simulation results show that it has a good filtering effect and dynamic reactive power compensation capabilities. Then a capacity of 10 kVA three-phase three - wire shunt active power filter prototype was developed, tested in the practical application of uncontrolled rec- tifier with resistance and inductance load. The experimental data shows that the harmonic compensation rate is above 90%.It also responds very fast under sudden changes in the load conditions, reaching its steady state in about one cycle of the fundamental, and shows the superior of this control strategy.