改善的主动频率偏移法在光伏并网孤岛检测中的应用

为了能够改善光伏并网孤岛检测效率和提高输出电能质量两者兼顾的问题,考虑到检测盲区,文章介绍了传统的主动式频率正向偏移法的实现过程,并分析了其特点及存在的缺点,从而提出了改善的反复性正反馈主动频率偏移法,引入符号函数对截断系数进行整定,不同负载下保障频率扰动方向可靠性,因此能够高效的检测出孤岛现象,降低了检测盲区和总谐波,改善了光伏逆变系统的输出电能质量。仿真及逻辑分析表明,该算法能够及时、准确的检测出电网的故障。

Application of Improvements the#$NBSActive Frequency#$NBSDrift Method in Photovoltaic Grid Islanding#$NBSPrevention

In order to improve the efficiency of islanding prevention of photovoltaic grid and power quality,Taking into account the problems of both and blind spot of detection, This paper introduces the implementation process of the traditional theSactive frequencySdrift method ofSislandingSprevention, and analyzes its characteristics and the shortcomings of existence, Thus an improved recurrent positive feedback theSactive frequencySdrift method is proposed, Introducing symbolic function tuning for truncates coefficients,Security frequency perturbations reliability under different load directions, So it can efficiently detect islanding,it reduces blind spot of detection and total harmonic,it improve output power quality of PV inverter systems. Its simulation and logic analysis shows that the algorithm can promptly and accurately detect the failure of the power grid.