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电网技术  2014 

弱电网接入下多光伏逆变器并联运行特性分析

DOI: 10.13335/j.1000-3673.pst.2014.04.017, PP. 933-940

Keywords: 电网阻抗,并联光伏逆变器,电能质量,动态响应,稳定性

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Abstract:

大规模光伏电站多位于电网结构薄弱的沙漠/半沙漠地带,长距离的输电线路使得电网等值阻抗不可忽略,影响光伏并网逆变器的安全稳定运行。本文以弱电网接入为研究背景,给出了多个光伏逆变器并联系统的控制模型,从电能质量、动态响应和系统稳定性3个方面分析了电网阻抗和并联数目对逆变器并联运行特性的影响,最后利用PSCAD软件对上述分析的有效性进行了仿真验证。

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