基于相位突变与电流扰动结合的并网孤岛检测

孤岛检测是分布式发电并网研究的难点,特别是在逆变器输出与负载功率平衡时难以检测出孤岛。针对常规孤岛检测方法存在检测盲区的缺陷,文中采用电压相位突变与主动电流扰动相结合的检测方法,该方法克服了采用单一的被动检测方法在近乎阻性负载下失效的问题,不存在检测盲区,可以实现快速有效的孤岛检测功能。仿真验证了该方法的正确性。

Islanding Detection Based on Phase Jump and the Current Active Perturbation Combination of Photovoltaic Grid-Connected System

It is difficult to detect islanding in distributed generation research, especially when power balance between the output of inverter and the load. This paper designs an islanding detection method based on phase jump and the current active perturbation combination of photovohaic grid-connected system. This method can overcome the shortcoming that the phase jump detection method fails to work under resistive load, and it can achieve fast and effective islanding detection. The load parameters range of islanding non-detection zone is discussed. Simulation results show that the proposed model is prac tical.