大容量并联型有源电力滤波器的软启动技术

分析大容量并联型有源电力滤波器的系统模型和工作特点的基础上,提出了大容量并联型有源电力滤波器软启动的方法。电流环软启动通过输出电流指令递增实现,电压环软启动则比较了直流侧电压指令逐步升高法、恒定电流充电法、变PI参数调节法三种策略。实验结果表明并联型有源电力滤波器投入电网时直流侧电压上升平稳无超调,输出电流也无冲击现象,证明此软启动方法是有效的。

Soft Start-Up Technique for Large Power Shunt Active Power Filter

Based on analysis of the model and characteristic of large power shunt active power filter(APF),the soft start-up technique for it is proposed in this paper.Soft start-up of current loop is realized by increasing output current reference step by step.Three soft start-up technique for voltage loop are compared with each other,which are the reference of DC bus voltage gradually increasing,constant charging current and different PI modulation.The experiment results show that the soft start-up technology not only makes the voltage of DC side rising smoothly with no overshoot,but also makes the output current within limit during the whole startup,the validity of the technique is proved.