基于单周控制的三相四线制APF直流侧电压控制的分析与研究

Analysis and research of DC voltage control of three-phase four-leg APF based on one-cycle control method

由于电网中各种非线性负载的增加,谐波问题日益严重。有源电力滤波器(APF)是目前进行谐波抑制的一种有效方法,而直流侧电容电压的稳定是APF控制中一个非常重要的环节,直接影响其补偿性能。传统直流侧电压控制方法是PI比例调节法,其中PI的参数难以实时确定。提出一种新的直流侧电压控制方法,即利用单周控制策略控制三相四桥臂换流电路来给APF直流侧提供电压支撑。该方法不但控制电路简单,而且换流电路实现单位功率因数运行,不会对电网带来附加的谐波危害。最后通过MATLAB/SIMULINK仿真软件建立了系统仿真模型,设计了试验样机。通过仿真与试验验证了该方法的稳定性与可靠性。

Because of various nonlinear network load increases, harmonic problems become more serious. Active power filter （APF） is an effective method for the harmonic suppression, and the DC side voltage stability control is an important link of APF control, which has a direct impact on compensation performance. Traditional DC side voltage control method is PI method, where the P1 parameters are difficult to ascertain. A new DC sire voltage control method is proposed in this paper, providing the power supply for the APF DC side by controlling three-phase four-leg rectifier with one-cycle control strategy. Not only is the control circuit very simple, but also the rectifier operates in the way as unity power factor, and it will not bring about additional harmonics in the network. Finally, the system simulation is made by MATLAB/SIMULINK software. Stability and reliability of the given method is verified by simulation and experiment.