用于谐波劣化分析的并网逆变器阻抗灰箱拟合方法

doi:10.19595/j.cnki.1000-6753.tces.201582

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Abstract As a large number of distributed generation systems are connected to the grid through inverters, complex interactions between grid-connected inverters and weak-grids are formed, and the problem of harmonic degradation is prominent. One of the key points of harmonic degradation analysis is to establish the impedance model of the grid-connected inverter. The detailed internal information is needed in white-box impedance modeling, and the results of black-box impedance modeling are meaningless. Both methods have defects in practical engineering application. Therefore, setting the result of white-box as the goal and taking the method of black-box as the solution way, this paper presents that the impedance of the grid-connected inverters in gray-box is fitted by rational function approximation. First of all, the discrete impedance data are obtained by dual-mode disturbance, and then the matrix pencil method is used to extract the initial parameters and reduce the time of iterative calculation. An improved vector fitting is proposed. Then a hardware in the loop real-time simulation platform is built based on RT-Lab, and the effectiveness and advantages of this method are verified by comparative experiments. Finally, the analysis of harmonic degradation is carried out based on the results of impedance fitting to verify the practicability of the proposed method.

Key words： Grid-connected inverters harmonic degradation impedance analysis method rational function approximation RT-Lab

Received: 04 December 2020

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TM712

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	Wu Binyuan
	Li Jianwen
	Li Yonggang
	Wang Yue
	Sun Wei

Cite this article:

Wu Binyuan,Li Jianwen,Li Yonggang等. A Gray-Box Fitting Method of Grid-Connected Inverters Impedance for the Analysis of Harmonic Degradation[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 942-953.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201582 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I4/942

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