有源电力滤波器直流侧电压控制的研究

Research on DC-side voltage control method of Active Power Filter

针对直流侧电压波动对有源电力滤波器性能的影响,以并联型有源电力滤波器为例,阐述了系统中直流侧电压波动的原因,从瞬时能量守恒方面分析了直流侧电压控制的原理,在此基础上提出了将PI控制和模糊控制相结合,构建模糊-PI复合控制器使直流侧电压稳定在基准值的方法。该方法充分发挥了PI控制与模糊控制各自的优点,具有动态响应快、超调小、静态误差小、实现简单的特点。通过Matlab仿真验证了该方法的正确性和可行性。

Aiming at the effects of the voltage ripple on Active Power Filter performance .Shunt Active Power Filter is taken as exampie to expatiate the causes of voltage ripple and analyze the control principle of DC-side voltage from the aspect of instantaneous conversation of energy .On the basis of these, a control method is brought forward, which makes DC-side voltage stabilify at the standard through a combined controller constituted PI controller and fuzzy controller. This method combines the merits of PI control and fuzzy control, has rapid dynamic response, small overshoot and small static state error, and is realized simply. The Matlab simulation results show that the proposed method is valid and feasible.