Electric energy quality analysis and suppression method based on fuzzy PI controller

The invention relates to an electric energy quality analysis and suppression method, in particular to an electric energy quality analysis and suppression method based on a fuzzy PI controller. The method comprises the following steps of: firstly, setting a threshold value of a PQ early warning level; performing PQ early warning before DG grid connection; performing actual measurement and prediction of PQ early warning after DG grid connection; and analyzing the early warning level. The control strategy of the outer loop voltage is improved based on the fuzzy PI controller, the control precision of the APF is effectively improved through the combination of the current decoupling control of the inner loop and the fuzzy control of the outer loop, and the electric energy quality is improved. 本发明涉及一种电能质量分析与抑制方法，尤其涉及一种基于模糊PI控制器的电能质量分析与抑制方法。按以下步骤进行：首先设置PQ预警等级的阈值→DG并网前的PQ预警→DG并网后的实测和预测PQ预警→预警等级分析。基于模糊PI控制器改进了外环电压的控制策略，通过内环的电流解耦控制与外环的模糊控制相结合,有效提高了APF的控制精度，改善了电能质量。