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A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems

  • Liu, Jiang (Key Laboratory of Education Ministry for Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology) ;
  • Cheng, Shanmei (Key Laboratory of Education Ministry for Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology) ;
  • Shen, Anwen (Key Laboratory of Education Ministry for Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology)
  • Received : 2016.06.15
  • Accepted : 2016.08.09
  • Published : 2017.01.20

Abstract

Conventional boost-full-bridge and boost-hybrid-bridge two-stage inverters are widely applied in order to adapt to the wide dc input voltage range of photovoltaic arrays. However, the efficiency of the conventional topology is not fully optimized because additional switching losses are generated in the voltage conversion so that the input voltage rises and then falls. Moreover, the electrolytic capacitors in a dc-link lead to a larger volume combined with increases in both weight and cost. This paper proposes a higher efficiency inverter with time-sharing synchronous modulation. The energy transmission paths, wheeling branches and switching losses for the high-frequency switches are optimized so that the overall efficiency is greatly improved. In this paper, a contrastive analysis of the component losses for the conventional and proposed inverter topologies is carried out in MATLAB. Finally, the high-efficiency under different switching frequencies and different input voltages is verified by a 3 kW prototype.

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