PRI Control Methodology for Grid-Connected Inverters in Harmonic Distorted Grid Utility

Abstract:

The impacts of grid voltage on grid current in distributed generation grid-connected inverters are analyzed, and a control strategy that can compensate harmonics and suppress DC bias is proposed. In comparison with traditional PR controller, the proposed PRI controller with an additional integral part obtains a higher gain in low frequency, and the controller has an apparent effort especially for suppressing DC bias. Finally the PRI controller is verified in a 50KW. The experimental results show that the PRI controller not only can reduce harmonics of grid current in the steady state but also can suppress DC bias rapidly in a dynamic process. The PRI controller is suitable for DGs since they typically contain low order harmonics which caused by nonlinear l three-level inverter loads.

• Periodical: Applied Mechanics and Materials (Volumes 668-669)
• Pages: 508-513
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.668-669.508
• Online since: October 2014
• Authors: Hui Pin Lin*, Jin Hu, Qun Wang, Zheng Yu Lu
• Keywords: Distributed Generation (DG), Grid-Connected, Harmonics, Proportional Resonant Integral Controller

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