Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Control method of PV hybrid systems with grid-connected MMC to overcome uneven irradiances

  • Thai Nguyen Tran (Department of Electrical Engineering, Jeju National University) ;
  • Jihun So (Department of Electrical Engineering, Jeju National University) ;
  • Changwan Jin (Department of Electrical Engineering, Jeju National University) ;
  • Yeong‑Jun Choi (Department of Electrical Engineering, Jeju National University)
  • Received : 2023.02.16
  • Accepted : 2023.04.05
  • Published : 2023.09.20
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Abstract

This paper proposes a modified structure and its control method for a hybrid modular multilevel converter (MMC)-based photovoltaic (PV)-battery energy storage system (BESS). The modified structure consists of PV arrays that are directly connected with sub-modules SMs, and batteries that are interfaced with the DC port of the SMs using a DC/DC converter. The control strategy implements an independent maximum power point tracking (MPPT) control for each of the PV arrays by individual SM voltage control for variable conditions. Embedded BESSs work as power and voltage compensators for the arms, and they are able to eliminate the weakness of the PV plant such as power mismatching and unsmooth power under variable illumination and partial shading. This is accomplished by average arm power control and moving average filter for the BESSs in each arm. Moreover, due to the contribution of the BESSs, it offers a lower total harmonic distortion (THD) under variable working conditions. The effectiveness and robustness of the method are verified by simulation results, which were obtained by conducting time-domain simulations in PSCAD/EMTDC under variable conditions.

Keywords

Acknowledgement

This research was supported by the 2022 scientific promotion program funded by Jeju National University

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