考虑电网阻抗影响的大型光伏电站并网稳定性分析

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摘要对于大型光伏电站, 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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关键词 ：大型光伏电站, 电网阻抗, 电能质量, 并网逆变器, 稳定性

Abstract：Harmonic problem of the grid-connected inverters was detected in many large-scale photovoltaic(PV) plants and the harmonic problem may occurred even if all the PV inverters do individually satisfy the standards. For these reasons, the effect of grid impedance is considered, and the equivalent circuit model of three-phase grid-connected parallel inverters with LCL filter is established based on the basic structure and operating principle of the PV plants. According to the established equivalent circuit model, the influence of grid impedance in the current control loop is analyzed. Theoretical analysis indicates that grid-connected parallel inverters in PV plants are coupled due to the grid impedance, and the coupling effect can destabilize the inverter current control loop and lead to harmonic content overweight. Moreover, this study is validated by means of simulation and experiment results.

Key words： Large-scale photovoltaic plants grid impedance power quality grid-connected inverters stability

收稿日期: 2012-07-17 出版日期: 2014-03-25

PACS:

TM46

基金资助:国家高技术研究发展计划(863计划) 资助项目(2011AA05A301)

作者简介: 杨明男, 1982年生, 博士研究生, 主要研究方向为新能源并网发电技术。周林男, 1961年生, 教授, 博士生导师, 主要研究方向为新能源并网发电技术、电能质量控制。

引用本文:

杨明, 周林, 张东霞, 张密. 考虑电网阻抗影响的大型光伏电站并网稳定性分析[J]. 电工技术学报, 2013, 28(9): 214-223. Yang Ming, Zhou Lin, Zhang Dongxia, Zhang Mi. Stability Analysis of Large-Scale Photovoltaic Power Plants for the Effect of Grid Impedance. Transactions of China Electrotechnical Society, 2013, 28(9): 214-223.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I9/214

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