【摘要】 分布式发电以及微电网中的孤岛检测是新能源并网的重要技术问题。工频畸变是一种特殊的电力线通信信号,把工频畸变信号应用到孤岛检测中,对信号经过配电网传输后的耦合特征和振荡特征进行分析,并基于此提出信号的硬件合成方法,计算信号偶次谐波特征值。采用自行研制的嵌入式硬件检测装置在现场对上述方法进行了测试,结果表明基于工频畸变信号的孤岛检测方法检测可靠性高、无检测盲区,具有重要的应用价值。更多还原

【Abstract】 Islanding detection for distributed power generation and microgrid is an important technical problem in the connection of new energy with power grid.As kind of special power line communication signal,the power frequency distortion signal is applied in the islanding detection.The coupling feature and oscillation characteristic of power frequency distortion signal transmitted through distribution network are analyzed and on this basis a method to synthesize this kind of signal by hardware is proposed,then an algorithm to calculate characteristic values of even harmonics of the signal is given.The on-site testings of the proposed method are performed by self-developed embedded hardware detection device,and testing results show that the proposed method possesses high detecting reliability and there is no non-detection zone in the detected range,so this method is available to anti-islanding protection for grid-connected distributed generation.更多还原