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http://dx.doi.org/10.6113/JPE.2015.15.5.1338

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

Wang, Wei (Smart Grid Key Laboratory of Ministry of Education, Tianjin University)
Wang, Ping (Smart Grid Key Laboratory of Ministry of Education, Tianjin University)
Bei, Taizhou (Smart Grid Key Laboratory of Ministry of Education, Tianjin University)
Cai, Mengmeng (Smart Grid Key Laboratory of Ministry of Education, Tianjin University)
Publication Information
Journal of Power Electronics / v.15, no.5, 2015 , pp. 1338-1347 More about this Journal
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.
Keywords
DC injection control; Design of parameters; LCL filter; Robustness; Virtual capacitor;
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