并联型有源滤波器直流侧电压稳定控制策略

有源滤波器直流侧电压的波动对有源滤波器的稳定运行有很大的影响，针对这个问题，分析了直流侧电压波动产生的原因及对有源滤波器运行的影响，对传统的PI控制提出了基于电压偏差平方的PI控制改进的方法．这种控制直流侧电压的方法对处理传统PI控制的非线性问题也有很大的改进。并通过madab仿真验证了改进的PI调节控制策略对谐波的消除有很好的效果，这种控制策略通过软件即可实现，不需要增加硬件设备，是一种经济的解决措施。

Stable Voltage Control at DC-side of Shunt Active Power Filter

DC-side Voltage fluctuation is a great impression for stable of Shunt Active Power Filter （SAPF） , according to this issue, the DC-side voltage fluctuation cause and influence on the performance of the SAPF are analyzed, put forward the square of the voltage deviation based on PI control method for the traditional PI control, it has a great improvement for dealing with the nonlinear problem of traditional PI control. And the matlab simulation proves good effect for the harmonic elimination, this harmonic elimination control strategy can be realized through software, no extra complex hardware needed, and is an economical solution.