引用本文: | 高晓帆,田书,常永强.一种新的大型光伏并网系统稳定性分析方法[J].电力系统保护与控制,2020,48(1):26-32.[点击复制] |
GAO Xiaofan,TIAN Shu,CHANG Yongqiang.A novel stability analysis method for large-scale photovoltaic system[J].Power System Protection and Control,2020,48(1):26-32[点击复制] |
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摘要: |
为了解决大型光伏并网系统稳定性分析方法复杂的问题,采用等效简化的方法引入一种基于单台逆变器的辅助系统,得到该辅助系统与大型光伏并网系统稳定性的关系,进而提出一种将大型光伏并网系统稳定性分析转化为单逆变器并网系统稳定性分析的方法。研究结果表明:对于由n台规格型号相同的逆变器并联后,通过电网阻抗Zg接入理想电网的大型光伏并网系统,其稳定的判定条件为同时满足逆变器自身闭环稳定和辅助系统稳定。对于所有逆变器规格型号统一的多逆变器并联并网系统,无论所有逆变器电流环输入参考电流是否完全相同,该方法均适用。仿真和实验结果验证了理论分析的正确性。 |
关键词: 大型光伏并网系统 多逆变器并联并网系统 电网阻抗 稳定性分析 |
DOI:10.19783/j.cnki.pspc.190203 |
投稿时间:2019-02-26修订日期:2019-07-16 |
基金项目:国家自然科学基金项目资助(51777060);河南省自然科学基金项目资助(162300410117) |
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A novel stability analysis method for large-scale photovoltaic system |
GAO Xiaofan,TIAN Shu,CHANG Yongqiang |
(School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China;Qinyang Power Generation Branch, National Power Investment Group Henan Electric Power Co., Ltd., Jiaozuo 454550, China) |
Abstract: |
To solve the problem that it is difficult to analyze the stability of large-scale photovoltaic (LSPV) plant, this paper brought in an auxiliary system based on a single grid-connected inverter by equivalent reduction method. And the relation between the auxiliary system and LSPV plant is obtained. Then an approach to transfer the stability analysis of LSPV plant into that of the single grid-connected inverter is proposed. Research results show that for the LSPV plant containing n sets of inverters with the identical type and specification and connecting to the ideal grid through the grid impedance Zg the requirement for its stability is that both the original inverter and the auxiliary system are stable. The proposed method is suitable for multi-inverter system where all inverters have identical type and specification whether all reference currents are identical or not. The simulation and experiment results have validated the theoretical analysis. This work is supported by National Natural Science Foundation of China (No. 51777060) and Natural Science Foundation of Henan Province (No. 162300410117). |
Key words: LSPV system multi-inverter grid-connected system grid impedance stability analysis |