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考虑电网阻抗影响的大型光伏电站并网稳定性分析

, PP. 214-223

Keywords: 大型光伏电站,电网阻抗,电能质量,并网逆变器,稳定性

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Abstract:

对于大型光伏电站,即使单台并网逆变器的输出电流谐波较小,多台并联后输出电流的谐波也有可能超标。基于上述原因,本文将电网阻抗考虑到大型光伏电站并网系统中,根据大型光伏电站的拓扑结构和工作原理,建立了三相LCL型并网逆变器并联系统的等效电路模型,针对所建立的等效电路模型,利用传统的频域分析法,对电网阻抗在大型光伏电站并网逆变器电流控制中的影响进行了分析。理论分析表明电网阻抗在大型光伏电站并网逆变器并联系统中存在耦合效应,该耦合效应降低了并网逆变器控制回路的带宽和稳定裕度,导致并网电流谐波含量超标等不稳定问题,仿真与实验结果验证了理论分析的正确性和可行性。

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