Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Characteristics analysis of micro-source half-bridge converter series Y-connection based microgrid systems

  • Xinggui Wang (Department of Electrical and Information Engineering, Lanzhou University of Technology) ;
  • Yingjie Ding (Department of Electrical and Information Engineering, Lanzhou University of Technology) ;
  • Jinjian Li (Department of Electrical and Information Engineering, Lanzhou University of Technology) ;
  • Yongji Guo (Department of Electrical and Information Engineering, Lanzhou University of Technology)
  • Received : 2022.11.26
  • Accepted : 2023.04.06
  • Published : 2023.10.20
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Abstract

Due to the problems of serious circulation current, large switching loss, high harmonic content, unstable voltage, and high engineering cost in existing microgrid structures, a micro-source half-bridge converter series Y-connection-based microgrid (HCSY-MG) is proposed in this paper. On the basis of the equivalent circuit in the system islanding state, the output characteristics of the system and the corresponding influencing factors under both square wave modulation and phase-shifted pulse width modulation (PS-PWM) are analyzed. Under single-cycle square wave modulation, since the DC-side capacitors of some micro-source half-bridge converters are affected by reactive power, which can result in system output voltage fluctuations or even an in-phase imbalanced state, a multi-period cycle modulation strategy is applied to solve this problem. Under the PS-PWM strategy, if the modulation degree and capacitance of the micro-source half-bridge converters are reasonably set, the output voltage of the system can be guaranteed to be in an in-phase equilibrium state. A simulation model and an experimental platform are built to verify the feasibility of the system and the effectiveness of the proposed strategy.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China under Grant 51967011.

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