【摘要】 以光伏逆变器为代表的各种并网逆变器通常要求具备孤岛检测功能.被动式的孤岛检测方法存在较大孤岛检测盲区.主动检测法提高了孤岛检测的可靠性,但其在并网逆变器的输出中施加了扰动,影响了并网电能质量.重点分析移频与移相主动孤岛检测算法的工作原理及参数选取原则,并给出相关的参数优化建议,同时探讨多并网逆变器运行时的孤岛检测有效特性,为光伏并网逆变器的孤岛检测设计提供参考.更多还原

【Abstract】 Islanding detection is an essential function for most grid-connected converters,especially PV grid-connected converters.The passive islanding detection methods have large none detection zone.The active islanding detection strategies are proposed to improve the detection ability.However,they introduce perturbations in the converters output,contributing to poor power quality.This paper analyzes the working principle and parameters selection rules for frequency shift and phase shift islanding detection techniques.The algorisms optimization and the multi-converter operation performance are also investigated.It provides basic islanding detection guidance for PV grid-connected converters.更多还原