基于系统电流检测的并联有源电力滤波器新型数字控制方法

提出了一种基于系统电流检测的并联有源电力滤波器数字控制方法,应用于以PWM(Pulse Width Modulation)电压源型变流器为主电路结构的并联有源电力滤波器中,对三相三线制系统中非线性负载的谐波和无功电流有理想的补偿效果.该控制方法只需检测系统电流和直流侧电压,无需参考电流,与传统控制方法相比具有检测量少、计算简单等优点.文章给出了理论分析和仿真结果,并以ADMC326(DSP)为控制核心设计了一套三相并联有源滤波器实验装置.仿真和实验结果证明了所提出控制方法的可行性和有效性.

A Novel Digital Control Method for Shunt Active Power Filter Based on Line Current Detection

On the basis of system current detection a novel digital control method for shunt active power filter is proposed.Applying the proposed method to the shunt active power filter in which the pulse width modulation(PWM) voltage source converter is adopted in the main circuit,in the three-phase three-wire system the active power filter can effectively eliminate harmonics of nonlinear load and compensate its reactive current.In this control method only system current and DC side voltage are to be detected and no referential current is needed.Comparing with traditional control methods,the advantages of the proposed method are simple calculation and less operating parameters to be detected.Here,the theoretical analysis and simulation results of the proposed method are given in detail,and a prototype of three-phase shunt active power filter is designed in which the digital signal processor chip ADMC326 is used as the core of the control.The results from simulation and tests verify the feasibility and effectiveness of the proposed method.