DC Injection Control for Grid-Connected Single-Phase Inverters Based on Virtual Capacitor


Vol. 15, No. 5, pp. 1338-1347, Sep. 2015
10.6113/JPE.2015.15.5.1338


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 Abstract

DC injection is a critical issue in transformerless grid-connected inverters. DC injection control based on virtual capacitor has the advantages of low cost, low loss, high accuracy and easy implementation. In this paper, the principle of DC injection control based on virtual capacitor was analyzed. In addition, the applicable conditions, working process, steady state error and advantages were also discussed in detail. The design of the control parameters based on virtual capacitor was proposed in a grid-connected inverter with LCL filter. The robustness of the control parameters was also discussed. Simulation and experimental results verify the validity of the analysis and demonstrate that this research has a certain value in engineering applications.


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Cite this article

[IEEE Style]

W. Wang, P. Wang, T. Bei, M. Cai, "DC Injection Control for Grid-Connected Single-Phase Inverters Based on Virtual Capacitor," Journal of Power Electronics, vol. 15, no. 5, pp. 1338-1347, 2015. DOI: 10.6113/JPE.2015.15.5.1338.

[ACM Style]

Wei Wang, Ping Wang, Taizhou Bei, and Mengmeng Cai. 2015. DC Injection Control for Grid-Connected Single-Phase Inverters Based on Virtual Capacitor. Journal of Power Electronics, 15, 5, (2015), 1338-1347. DOI: 10.6113/JPE.2015.15.5.1338.