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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Solar Energy
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1371239

Model predictive control for single-phase cascaded H-bridge photovoltaic inverter system considering common-mode voltage suppression

Provisionally accepted
Xinwei Wei Xinwei Wei 1Wanyu Tao Wanyu Tao 2*Xunbo Fu Xunbo Fu 1
  • 1 State Nuclear Power Planning Design and Research Institute CO., Ltd, Beijing, China
  • 2 College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province, China

The final, formatted version of the article will be published soon.

    In this article, a model predictive control (MPC) with common-mode voltage (CMV) suppression is proposed for single-phase cascaded H-bridge (CHB) inverters, which can also simultaneously achieve control objectives of grid-connected current tracking, voltages balancing of different H-bridge submodules on the DC-side and switching frequency reduction. To suppress high-frequency components of the CMV without additional switching devices, the algorithm proposed designs the predicted and reference values of the CMV and incorporates them in the cost function. At the same time, the capacitor voltages balancing control is integrated in the calculation of the optimal modulation function of the H-bridge, which reduces the complexity of control effectively. Besides, switching times of the MOSFETs are compared in two cycles. The cost function is constructed to represent comprehensive effect of the control. Finally, an experiment is performed on the hardware-in-the-loop experimental platform. The experimental results show that the proposed algorithm can offer a better voltage THD and reduce the times of switch action by nearly half while maintaining high-precision current tracking and maximum power point of PV modules, which alleviate the potential electromagnetic interference and cabling problem.

    Keywords: Model predictive control (MPC), photovoltaic system, cascaded H-bridge (CHB), common-mode voltage (CMV), maximum power point tracking (MPPT). 7 Author Contributions Conceptualization, X.W., formal analysis, X.G., funding acquisition, C.R., investigation, W.T., methodology, X.W., software, C.Q., validation, W.T., writing, X.W., W.T.

    Received: 16 Jan 2024; Accepted: 17 Apr 2024.

    Copyright: © 2024 Wei, Tao and Fu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Wanyu Tao, College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi Province, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.