基于模糊PI的Boost PFC变换器的控制改进

为了减小开关变换器电流畸变对电网供电质量的影响,同时提高负载电压的动态响应性能,本文针对一个实际的单相功率因数校正装置设计改进控制方案。在建立小信号模型的基础上,根据其频域特性设计了相应的补偿器,并将电压环控制环节改进为模糊PI控制器。仿真运行结果表明,本文所设计的Boost PFC变换器的输出电压波形得到很好的改善,有效提高了电网供电质量。

Control improvement of Boost PFC converter based on fuzzy PI

To reduce the influence of the current distortion of the switching converter on the power supply quality of the power grid and improve the dynamic response performance of the load voltage, an improved control scheme for a practical single-phase power factor correction device is designed in this paper. Based on the establishment of a small signal model, the corresponding compensator is designed according to its frequency domain characteristics, and the controller of the voltage loop is improved to a fuzzy PI controller. The simulation results show that the output voltage of the designed Boost PFC converter has been improved well, and the power supply quality of the power grid is effectively improved.