針對直流側電壓波動對有源電力濾波器性能的影響，以并聯型有源電力濾波器為例，闡述了系統中直流側電壓波動的原因，從瞬時能量守恒方面分析了直流側電壓控制的
原理，在此基礎上提出了將PI控制和模糊控制相結合，構建模糊-PI復合控制器使直流側電壓穩定在基準值的方法。該方法充分發揮了PI控制與模糊控制各自的優點，具有動態響應快、超調小、靜態誤差小、實現簡單的特點。通過Matlab仿真驗證了該方法的正確性和可行性。
關鍵字：有源電力濾波器；直流側電壓控制；模糊-PI 控制
Abstract ： Aiming at the effects of the voltage ripple on Active Power Filter performance .Shunt Active Power Filter is taken as example 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.
Key words：Active Power Filter；DC-side voltage control ；Fuzzy-PI control