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Photovoltaic System with a Battery-Assisted Quasi-Z-Source Inverter: Improved Control System Design Based on a Novel Small-Signal Model

Author

Listed:
  • Ivan Grgić

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Department of Power Engineering, University of Split, 21000 Split, Croatia)

  • Dinko Vukadinović

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Department of Power Engineering, University of Split, 21000 Split, Croatia)

  • Mateo Bašić

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Department of Power Engineering, University of Split, 21000 Split, Croatia)

  • Matija Bubalo

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Department of Power Engineering, University of Split, 21000 Split, Croatia)

Abstract

This paper deals with a photovoltaic (PV) system containing a quasi-Z-source inverter (qZSI) and batteries connected in parallel with the qZSI’s lower-voltage capacitor. The control system design is based on knowledge of three transfer functions which are obtained from the novel small-signal model of the considered system. The transfer function from the d -axis grid current to the battery current has been identified for the first time in this study for the considered system configuration and has been utilized for the design of the battery current control loop for the grid-tied operation. The transfer function from the duty cycle to the PV source voltage has been utilized for the design of the PV source voltage control loop. The PV source voltage is controlled so as to ensure the desired power production of the PV source. For the maximum power point tracking, a perturb-and-observe algorithm is utilized that does not require the measurement of the PV source current, but it instead utilizes the battery current during the stand-alone operation and the d -axis reference current during the grid-tied operation. The corresponding tracking period was determined by using the transfer function from the duty cycle to the battery current and in accordance with the longest settling time noted in the corresponding step response. The proposed control algorithm also has integrated protection against battery overcharging during the stand-alone operation. The considered system has been experimentally tested over wide ranges of irradiance and PV panel temperature.

Suggested Citation

  • Ivan Grgić & Dinko Vukadinović & Mateo Bašić & Matija Bubalo, 2022. "Photovoltaic System with a Battery-Assisted Quasi-Z-Source Inverter: Improved Control System Design Based on a Novel Small-Signal Model," Energies, MDPI, vol. 15(3), pages 1-29, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:850-:d:732494
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    References listed on IDEAS

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    1. Lluís Monjo & Luis Sainz & Juan José Mesas & Joaquín Pedra, 2021. "State-Space Model of Quasi-Z-Source Inverter-PV Systems for Transient Dynamics Studies and Network Stability Assessment," Energies, MDPI, vol. 14(14), pages 1-15, July.
    2. Lluís Monjo & Luis Sainz & Juan José Mesas & Joaquín Pedra, 2021. "Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies," Energies, MDPI, vol. 14(2), pages 1-16, January.
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    Cited by:

    1. Dinko Vukadinović, 2022. "Advanced Control Techniques for Wind/Solar/Battery Systems," Energies, MDPI, vol. 15(9), pages 1-2, May.
    2. Rafael Santos & Marcus V. M. Rodrigues & Luis De Oro Arenas & Flávio A. S. Gonçalves, 2023. "A Comprehensive Small-Signal Model Formulation and Analysis for the Quasi-Y Impedance-Source Inverter," Energies, MDPI, vol. 16(13), pages 1-24, June.

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