基于正切滑模频移法的孤岛检测方法

Islanding detection based on tangent sliding mode frequency shift method

在研究传统滑模频移(SMS)孤岛检测法的基础上,使用正切函数代替SMS中的正弦函数来设置电流的主动移相角,提出了一种新的正切滑模频移孤岛检测法,并对该方法的参数设定、检测盲区和多机并联运行时的工作特性进行了量化分析。该方法避免了SMS法中稳定状态的发生,显著减小了检测盲区,同时可以减小对电网的负面影响,提高孤岛检测速度,适用于多机并联系统且不受稀释效应影响。仿真结果证明了所提方法的有效性和优越性。

Based on the study of SMS（Sliding Mode frequency Shift） islanding detection method,an improved one is proposed,which applies the tangent function instead of the sinusoidal function used in SMS to express the phase-shifted angle of current. Its parameter setting,detection dead-zone and multi-inverter operating performance are analyzed quantitatively. Suitable for grid-connected multi-inverter system and without dilution effect,it avoids the stable state happened in SMS method,reduces the detection dead-zone, decreases the negative impact on grid and increases islanding detection efficiency. Simulative results show its effectiveness and superiority.