正反馈主动移频式孤岛检测算法的改进

Improved algorithm for active frequency drift with positive feedback islanding detection

当电网发生故障停止供电时,需快速检测出分布式发电系统形成的微网电力孤岛,停止其与电网之间的并网连接,正反馈主动移频式(active frequency drift with positive feedback,AFDPF)孤岛检测技术是一种常用的电力孤岛检测方法。文章结合传统的正反馈主动移频式孤岛检测算法原理,在此算法基础上叠加反馈移频的二次方项进行改进,并阐述了其工作原理及对微电网系统的影响。通过理论分析及仿真验证表明,改进算法后的正反馈主动移频式孤岛检测是有效的,缩短了孤岛检测时间,减小了检测盲区,提高了检测效率,理论上不会对微电网系统带来新的谐波污染。

When the power grid failure to stop the power supply, micro grid power islanding formed by distributed generation system should be quickly detected, and stop the connection between it and the power grid, active frequency drift with positive feedback （AFDPF） islanding detection technology is a commonly used method for detection of islanding. Combined with the traditional active frequency drift with positive feedback islanding detection principle in this paper, on the basis of the algorithm, a quadratic term of the feedback frequency drift is superposed to improve it, and expounds the working principle and the influence to the micro grid system. Through theoretical analysis and simulation results show that the improved algorithm for active frequency drift with positive feedback islanding detection method is feasible, shorten the islanding detection time, reduce the blind spot detection, and improve the detection efficiency, will not bring new harmonic pollution to micro grid system in the theory.