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高压电器  2015 

一种基于相位偏移的自抗扰孤岛检测法在光伏并网逆变系统中的应用

DOI: 10.13296/j.1001-1609.hva.2015.10.003, PP. 13-18

Keywords: 并网逆变器,主动式孤岛检测法,相位偏移,自抗扰,检测盲区

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Abstract:

光伏并网逆变器必须具备孤岛检测功能,而传统的孤岛检测法存在检测盲区。文中首先采用品质因数/谐振频率平面法对基于相位偏移的孤岛检测法的检测盲区进行分析。在此基础上,提出了一种基于相位偏移的自抗扰孤岛检测法,该方法通过引入频率控制函数,一方面能够有效地防止系统扰动造成的误判,另一方面有效的减小了检测盲区。此外,文中还给出了自抗扰孤岛孤岛检测法参数选取方案。最后,通过数值仿真验证了不同负载状况下该孤岛检测方法的有效性。

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