三相四桥臂有源电力滤波器控制研究

Research on the Control of Three-Phase Four-Leg Active Power Filter

针对三相四线制系统中不对称负载的情况,采用了四桥臂的有源电力滤波器,可以实现三相四线制系统的谐波补偿,同时可以治理中线上的谐波电流。为了更好地实现电流跟踪,提出了将BP神经网络PID应用于电流环的电流跟踪,通过MATLAB/Simulink仿真验证,并与传统PI控制器进行对比,结果表明,BP神经网络PID的控制效果明显优于传统PI控制器。

To solve the problem of asymmetric load in three-phase four-wire system,the four-leg active power filter is used to compensate for the harmonic of three-phase four-wire system and to control the harmonic current in the neutral line.For the purpose of tracking current accurately and fast,BP neural network PID is applied to track the current loop.Through the simulation and verification of MATLAB/Simulink and the comparison with traditional PI controller,the results show that the control effect of BP neural network PID is obviously better than that of traditional PI controller.