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Energy Balance Control of a Cascaded Multilevel Inverter for Standalone Solar Photovoltaic Applications

Author

Listed:
  • Lei Wang

    (School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China)

  • Qinghua Wu

    (School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China)

  • Wenhu Tang

    (School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China)

Abstract

This paper presents a clock phase-shifting (CPS) energy balance control (EBC) method for cascaded half-bridge multilevel inverters in standalone solar photovoltaic (PV) systems. It is based on the conservation of energy in each cascaded unit. By shifting the phase of the clock pulse of each cascaded unit, a staircase-like output voltage is obtained. The CPS EBC not only regulates the staircase-like output voltage of the cascaded multilevel inverters accurately under static conditions, but also suppresses the fluctuations of DC sources and improves its dynamic responses to load steps. Thus, the problems existing in solar PV systems using the cascaded multilevel inverters are avoided. Results obtained from simulations and experiments are presented to verify the feasibility and advantages of the proposed control method.

Suggested Citation

  • Lei Wang & Qinghua Wu & Wenhu Tang, 2017. "Energy Balance Control of a Cascaded Multilevel Inverter for Standalone Solar Photovoltaic Applications," Energies, MDPI, vol. 10(11), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1805-:d:118132
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    References listed on IDEAS

    as
    1. Xiongmin Tang & Junhui Zhang & Zheng Liu & Miao Zhang, 2017. "A Switching Frequency Optimized Space Vector Pulse Width Modulation (SVPWM) Scheme for Cascaded Multilevel Inverters," Energies, MDPI, vol. 10(5), pages 1-18, May.
    2. Turgay Duman & Shilpa Marti & M. A. Moonem & Azas Ahmed Rifath Abdul Kader & Hariharan Krishnaswami, 2017. "A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems," Energies, MDPI, vol. 10(5), pages 1-28, May.
    3. Fayun Zhou & An Luo & Yan Li & Qianming Xu & Zhixing He & Josep M. Guerrero, 2017. "Double-Carrier Phase-Disposition Pulse Width Modulation Method for Modular Multilevel Converters," Energies, MDPI, vol. 10(4), pages 1-23, April.
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