基于奇次谐波估计的分布式电源并网孤岛检测方法

Island detection method of distributed power grid connection based on odd harmonic estimation

针对分布式发电系统中的孤岛现象,提出一种基于奇次谐波估计的分布式电源并网孤岛检测方法。首先介绍准比例谐振控制,并将模糊控制与其相结合,用于减少逆变器侧产生的谐波,然后详细阐述利用卡尔曼滤波的谐波估计方法以及孤岛判断的方法,最后通过Matlab/Simulink平台进行仿真实验。仿真结果表明,该方法检测速度较快、盲区较小,验证了实验的有效性和可行性。

For the island phenomenon existing in the distributed power generation system,an island detection method of the distributed power grid connection based on odd harmonic estimation is proposed.The quasi proportion resonance control is introduced,which is combined with the fuzzy control to reduce the harmonics generated in the inverter.The island judgment method and harmonic estimation method based on Kalman filtering are elaborated.The simulation experiments were performed with the Matlab/Simulink platform.The simulation results show that the method has fast detection speed and small detection dead zone.Both the feasibility and availability of the experiment were verified.