一种改进型频率正反馈孤岛检测方法研究

针对传统孤岛检测算法的检测时间较长问题,提出一种改进型频率正反馈孤岛检测方法。即以缩短孤岛检测时间为目的,在逆变器输出角频率时加入正反馈增益系数A和B,加快频率的偏移速率。探讨了A和B取不同值时逆变器输出电压角频率对应的反馈强度和检测效果。同时通过分析成功检测孤岛现象的临界条件,确定了有效缩短检测时间的A、B值。仿真得出的结论与理论分析结果相符合,从而验证了所提方法的有效性。

Research on an Improved Method of the Frequency Positive Feedback Islanding Detection

In view of the flaw of a long detection time in traditional islanding detection algorithm, an improved frequency positive feedback islanding detection method has thus been proposed. The islanding detection time can be shortened by the addition of the positive feedback gain coefficienta A and B to the inverter output angle frequency, followed by a tentative investigation on the feedback strength and detection effects of inverter output voltage angle frequency corresponding to different values of A and B. Meanwhile, an analysis has been made of the critical condition for a successful detection of the islanding phenomenon, thus obtaining A and B values of effective detection time. The simulation results are consistent with the theoretical analysis results, which verify the effectiveness of the proposed method.