【摘要】 孤岛检测是分布式发电并网研究的难点,特别是在逆变器输出与负载功率平衡时难以检测出孤岛。为了检测孤岛效应,本文提出了基于dq变换和正反馈的新检测策略,基于这个策略,提出了基于dq变换的电压正反馈和频率正反馈两种检测方法。该两种方法具有无检测盲区,对电能质量影响小,检测速度快等优点。仿真结果证实了两种方法的有效性。更多还原

【Abstract】 It is difficult to detect islanding in distributed generation research,especially when power balance between the output of inverter and the load.A new scheme based on dq transformation and positive feedback is provided to detect islanding.Based on the new scheme,methods of voltage positive feedback and frequency positive feedback by dq transformation are proposed in this paper.The proposed methods are shown to have no non-detection zone(NDZ) and little influence on power quality and fast acting.Simulation results show the effectiveness of the two methods.更多还原