光伏并网逆变器的孤岛检测研究

Research on Islanding Detection of PV Grid Inverter

通过对系统功率匹配情况的分析,得到了影响孤岛效应检测效果的原因,相应设计了光伏并网系统的改进频率扰动方案对孤岛效应进行检测。理论分析表明,与主动频率偏移方案相比,改进频率扰动方案的检测速度更快,对并网逆变器输出电能质量的影响更小,能取得较好的检测效果。MATLAB中的仿真结果验证了改进频率扰动方案的有效性和可行性。

Through the analysis of the matching of system functions, gets the reason of the effect islanding detection results, and designs the PV grid systemg improved frequency perturbation scheme to detect islanding. The theoretical analysis shows that improved frequency perturbation scheme can achieve a better detection results which faster detection speed and output power quality less of grid inverter than active frequency deviation scheme. The simulation results of MATLAB proves the effectiveness and feasibility of improved frequency perturbation scheme.