基于Z源逆变器混合式孤岛检测方法研究

Research on hybrid island detection method based on Z source inverter

针对传统逆变器结构的主动频移式孤岛检测方法存在对电能质量影响较大的问题,阐述了传统逆变器的结构和孤岛效应发生的原理,分析了Z源逆变器的工作原理和混合式孤岛检测方法的检测原理,提出了一种基于Z源逆变器的混合式孤岛检测方法。该逆变器结构采用一种改进型Z源逆变器并且利用盲区判别模型来自动选择检测方法,能够判断出孤岛发生。仿真结果表明,基于Z源逆变器的混合式孤岛检测方法可以保证在各种负载情况下检测出孤岛效应的发生,减小对电能质量的影响。

The active frequency shift islanding detection method with traditional inverter structure has great influence on power quality. Due to this problem, the structure of the traditional inverter and the principle of the island effect are explained. The principle of Z source inverter and the principle of hybrid island detection method are analyzed successively. Above all, a hybrid island detection method based on Z source inverter is proposed. The inverter structure adopts a modified Z-source inverter, and the blind zone discriminant model is used to automatically select the detection method and to determine the island occurrence. The simulation results show that the hybrid method proposed in this paper can detect the occurrence of islanding effect under various load conditions and reduce the impact on power quality.