Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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AC bus-voltage control method based on load impedance characteristics for single-phase grid-connected inverters

  • Huagen Xiao (Department of Electrical Engineering, Hunan University of Science and Technology) ;
  • Songbin Liu (Hainan Jinpan Intelligent Technology Co, Ltd) ;
  • Yuan Huang (Department of Electrical Engineering, Hunan University of Science and Technology)
  • Received : 2022.06.30
  • Accepted : 2022.10.28
  • Published : 2023.03.20
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Abstract

Aiming at the problem of the grid connected and of grid switching control of grid connected inverters, an ac bus-voltage control method based on load impedance characteristics is proposed for single-phase photovoltaic grid-connected inverters with batteries in this paper. The proposed control method includes a detection algorithm for the load impedance angle and an AC bus-voltage control algorithm. Thus, grid-connected inverters can output active and reactive current in proportion to the load impedance characteristics without a special reactive power calculation module to support the AC bus voltage. At the same time, the proposed control method can avoid the switching action of the control algorithm when the grid-connected inverter is switched from grid-connected mode to island mode. Finally, simulation and experimental results verify the effectiveness of the proposed method.

Keywords

Acknowledgement

All authors of this paper thank editors and reviewers for their continuous encouragement and support. This work was supported by the Natural Science Foundation of Hunan Province (2019JJ50183).

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