并联型有源电力滤波器直流侧电压控制分析

Analysis of DC-side Voltage Control of Shunt Active Power Filter

并联型有源电力滤波器并入电网时,直流侧电压存在着启动静差和超调量较大的工程问题。在传统PI控制基础之上,直流侧电压采用一种输入压差平方值的P-模糊-PI多模态控制算法,运用了模糊规则多模切换控制器去确定阈值的切换值。最后在仿真软件Matlab/Simulink中进行了可行性分析,发现直流侧的电容电压从零上升到期望稳定值的静差率和超调量变小,压差平方使空载电流减小,响应速度快。仿真结果表明了该控制算法优于传统PI控制,具有良好的工程应用价值前景。

When a shunt active power filter（APF）is connected to the power grid,some engineering problems exist in the DC-side voltage,such as large starting static difference and large overshoot. Based on the traditional PI control,a Pfuzzy-PI multi-mode control algorithm for input pressure difference square values is adopted on the DC-side voltage,and the switching value of the threshold is determined using a fuzzy-rule multi-mode switching controller. Finally,feasi？bility analysis is performed in simulation software Matlab/Simulink,and it is found that the static difference rate and overshot decrease when the DC-side capacitor voltage increase from zero up to the expected stable value;meanwhile,the pressure difference square reduces the no-load current and accelerates the response speed. Simulation results show that the proposed control algorithm is superior to the traditional PI control,and it has a good prospect for engineering ap？plications.