一种新型直流微电网DC-APF控制策略

针对直流母线电压存在的纹波分量会对整个直流微电网供电电能质量以及设备运行安全性造成影响的情况,提出了一种新型直流有源滤波器(DC active power filter,DC-APF)控制策略,抑制直流母线电压纹波。在分析DC-APF的多种模态工作基础上,对纹波检测和抑制方案进行了设计优化;提出了基于小波变换Mallat算法的直流母线电压纹波检测法;在传统PI与模糊PI控制的基础上,提出了改进的模糊自适应PI控制,实现对补偿电流的跟踪控制方法;在MATLAB/Simulink仿真环境中搭建了含DC-APF的直流微电网系统模型。仿真结果表明,与传统的DC-APF控制策略相比,新型DC-APF控制方法可以实现对直流母线电压纹波的快速检测,具有良好的纹波补偿抑制效果。所提策略可提升DC-APF对纹波的检测性能和抑制效果,为直流微电网纹波检测与抑制提供新的思路。

A new DC-APF control strategy for DC microgrid

The ripple component of the DC bus voltage will affect the power supply quality of the entire DC microgrid and the safety of equipment operation. Therefore, a new DC active power filter (DC-APF) control strategy was proposed to suppress the DC bus voltage ripple. The ripple detection method and suppression scheme were optimized based on the analysis of various work modes of DC-APF. A DC bus voltage ripple detection method based on wavelet transform Mallat algorithm was proposed. On the basis of traditional and fuzzy PI control, an improved fuzzy adaptive PI control was proposed to realize the tracking control method of compensation current. A DC microgrid system model with DC-APF was built in MATLAB/Simulink. The simulation results show that, compared with the traditional DC-APF control method, the new type DC-APF control strategy can achieve rapid detection of DC bus voltage ripple and has good ripple compensation effect. The proposed strategy can improve the detection performance and suppression effect of DC-APF on ripple, which provides a new method for ripple detection and suppression in DC microgrid.