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Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors

Author

Listed:
  • Faa Jeng Lin

    (Department of Electrical Engineering, National Central University, Taoyuan 32001, Taiwan)

  • Hsuang Chang Chiang

    (Department of Electrical Engineering, National United University, Miaoli 360, Taiwan)

  • Jin Kuan Chang

    (Department of Electrical Engineering, National Central University, Taoyuan 32001, Taiwan)

Abstract

This paper outlines the modeling and controller design of a novel two-stage photovoltaic (PV) micro inverter (MI) that eliminates the need for an electrolytic capacitor (E-cap) and input current sensor. The proposed MI uses an active-clamped current-fed push-pull DC-DC converter, cascaded with a full-bridge inverter. Three strategies are proposed to cope with the inherent limitations of a two-stage PV MI: (i) high-speed DC bus voltage regulation using an integrator to deal with the 2nd harmonic voltage ripples found in single-phase systems; (ii) inclusion of a small film capacitor in the DC bus to achieve ripple-free PV voltage; (iii) improved incremental conductance (INC) maximum power point tracking (MPPT) without the need for current sensing by the PV module. Simulation and experimental results demonstrate the efficacy of the proposed system.

Suggested Citation

  • Faa Jeng Lin & Hsuang Chang Chiang & Jin Kuan Chang, 2016. "Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors," Energies, MDPI, vol. 9(12), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:12:p:993-:d:83793
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    Citations

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    Cited by:

    1. Yu-Chen Liu & Ming-Cheng Chen & Chun-Yu Yang & Katherine A. Kim & Huang-Jen Chiu, 2018. "High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications," Energies, MDPI, vol. 11(3), pages 1-15, March.
    2. Sungmin Park & Weiqiang Chen & Ali M. Bazzi & Sung-Yeul Park, 2017. "A Time-Efficient Approach for Modelling and Simulation of Aggregated Multiple Photovoltaic Microinverters," Energies, MDPI, vol. 10(4), pages 1-19, March.

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