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电网技术  2014 

适用于并网逆变器集群系统孤岛检测的改进滑模频率漂移法

DOI: 10.13335/j.1000-3673.pst.2014.12.001, PP. 3271-3278

Keywords: 逆变器集群,光伏发电,孤岛检测,滑模频率漂移法

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Abstract:

常规的孤岛检测方法主要适用于单机光伏并网系统,在逆变器集群系统应用时存在局限性。滑模频率漂移法是一种被广泛应用的主动式孤岛检测方法,分析多逆变器并联运行情况下的公共并网点电流波形后发现,该方法可能由于系统线路阻抗的存在,导致检测盲区向频率下降方向倾斜,加大了光伏并入弱电网情况下孤岛检测失效的风险,同时延长了反应时间。为此,提出了一种具有电流误差相位补偿作用的改进滑模频率漂移法,能够有效降低逆变器集群电流相位不一致产生的影响。仿真结果验证了所提方法的有效性。

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