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Power electronics control advances and the applicability of solar photovoltaic (PV) cells simplify power production, application, and grid integration, reducing cost and volume while enhancing efficiency. The transformer-less inverter are becoming prominent for small power ratings of electrical loads because of the decreased cost, radioactive interference, losses, THD, and increased controllability when compared to transformer-based inverters or multi-stage inverters. In this paper, a Switched Trans Z Source (STZS) converter is controlled by a PI controller with a Whale Optimization (WO) algorithm, and a grid-connected PV system’s grid synchronization is controlled using the PI controller. The Switched Trans Z-Source (STZS) converter is preferred as it has high boost factor and minimized switching stress. The STZS converter’s gating sequence is generated using the WO algorithm, and the link voltage is retained and fed into the grid through a single-phase VSI. The VSI is regulated by the PI controller which analogizes the reference and real powers to achieve grid synchronization and reactive power adjustment. The proposed control strategy is simulated in MATLAB and implemented in hardware using an FPGA Spartan 6E, and the results are examined. The THD of the source current is 1.6%, which meets the IEEE standard.

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Optimized Closed Loop PI Controller for Grid-Tied Single-Phase PV with Switched Trans Z-Source Converter Using WO Algorithm

  • 会议论文

  • 发表日期：

    2025年

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  • P. Buchibabu,
  • Jarupula Somlal

摘要

Power electronics control advances and the applicability of solar photovoltaic (PV) cells simplify power production, application, and grid integration, reducing cost and volume while enhancing efficiency. The transformer-less inverter are becoming prominent for small power ratings of electrical loads because of the decreased cost, radioactive interference, losses, THD, and increased controllability when compared to transformer-based inverters or multi-stage inverters. In this paper, a Switched Trans Z Source (STZS) converter is controlled by a PI controller with a Whale Optimization (WO) algorithm, and a grid-connected PV system’s grid synchronization is controlled using the PI controller. The Switched Trans Z-Source (STZS) converter is preferred as it has high boost factor and minimized switching stress. The STZS converter’s gating sequence is generated using the WO algorithm, and the link voltage is retained and fed into the grid through a single-phase VSI. The VSI is regulated by the PI controller which analogizes the reference and real powers to achieve grid synchronization and reactive power adjustment. The proposed control strategy is simulated in MATLAB and implemented in hardware using an FPGA Spartan 6E, and the results are examined. The THD of the source current is 1.6%, which meets the IEEE standard.