改进型Sandia方法在孤岛检测中的应用研究

Application of Improved Sandia Method in Island Detection

针对在主动频移类孤岛检测方法中负载性质对检测效果存在影响的问题,提出了一种改进型Sandia检测方法。通过检测公共耦合点(PCC)电压与逆变器输出电流的相位差来判断负载性质,从而进一步确定是否改变扰动方向,最后判断出孤岛的发生。仿真结果表明,提出的方法可以在各种负载性质下有效地检测出孤岛效应的发生,有效防止了负载性质对检测效果的影响。

Aiming at the problem that the load property has influence on the detection effect in the active frequency shifting islanding detection method,an improved Sandia detection method is proposed.By detecting the phase difference between the voltage of the public coupling point(PCC) and the output current of the inverter,the nature of the load is judged,thereby further determining whether to change the direction of the disturbance,and finally judging the occurrence of the island.The simulation results show that the proposed method can effectively detect the occurrence of the island effect under various load properties and effectively prevent the influence of the load nature on the detection effect.