第2次高調波インピーダンス推定による低圧連系インバータ用単独運転検出手法の開発

抄録

We propose the islanding detection method by estimating the changes in the second harmonic impedance before and after islanding operation. As the active signal, the second harmonic current is used. By detecting the ratio of the secondary conductance, it is possible to restrain the decline in detection sensitivity even for a load with a large quality factor or in multiple connection with inverters that have different islanding detection method. We have developed three single-phase inverters for low voltage interconnection and clarified the effectiveness of the proposed method.