摘要
孤岛检测技术不但要求其能快速准确地检测出孤岛的发生时刻,还要尽可能减小对电网电能质量的影响。分析了主动频率偏移法(AFD)、正反馈主动频率偏移法(AFDPF)存在的谐波畸变、检测速度、检测盲区等固有矛盾,在AFDPF算法的基础上进行了改进,并搭建了基于Matlab/Simulink的仿真模型,通过光伏电源和负荷的投切仿真实验,验证了改进算法的可行性。
Islanding detection technology is an important part of the research of photovoltaic grid connected system, which not only requires itself to detect the occurrence of isolated island quickly and accurately, but also reduces the influence on the power quality of power grid as much as possible. This paper analyzed the inherent contradictions of the active frequency offset(AFD), the positive feedback active frequency offset(AFDPF) and the harmonic distortion, test speed and non-detection zone. On the basis of the AFDPF algorithm, a simulation model is built based on the Matlab/Simulink. The photovoltaic power and load switching verify the feasibility of the improved algorithm.
引文
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