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一种基于参考频率电网同步信号实时检测方法

DOI: 10.13334/j.0258-8013.pcsee.2014.09.005, PP. 1353-1359

Keywords: 电网同步信号,参考频率,频率偏移,相位偏移,校正

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Abstract:

在新能源等采用变换器并网场合,电网同步信号检测是并网控制的关键。目前研究的锁相环电网同步方法还存在一定的缺陷,基于此,提出一种基于参考频率的电网同步信号实时检测方法,仅检测单相电网电压与参考频率正弦、余弦信号运算,在三相电网畸变、不平衡条件下能准确检测电网同步信号。针对电网出现频率偏移导致检测的同步信号存在较大的相位偏移,对检测过程中低通滤波环节引入负反馈和比例控制进行改进,可将相位偏移校正到满意的指标下。理论与实验研究结果均表明该方法的正确性和有效性。

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