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Research on Application of Non-Isolated Three-Port Switching Boost Converter in Photovoltaic Power Generation System

1
Electrical and Control Engineering College, North China University of Technology, Beijing 100144, China
2
Beijing Electric Power Energy-Saving Key Technology Collaborative Innovation Center, Beijing 100144, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(7), 746; https://doi.org/10.3390/electronics8070746
Received: 14 May 2019 / Revised: 21 June 2019 / Accepted: 25 June 2019 / Published: 2 July 2019
(This article belongs to the Section Power Electronics)
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Abstract

This paper presents a non-isolated three-port switching boost converter and applies it to photovoltaic systems. The topology combines the characteristics of the switching boost network. By controlling three degrees of freedom, the ports have boost, buck, and buck-boost characteristics. It expands the three-port converter (TPC) working range with the advantages of simple structure, small size, and low cost. The operating mode and power flow direction of the TPC are determined according to the state of charge (SOC) of the energy storage system. Analyses of the working state of the topology in different working modes further verify the power flow of the system and explain its control strategy to complete the smooth switching of different working modes. Finally, the correctness of the above theory and its feasibility in photovoltaic system are verified by simulation and experiment. View Full-Text
Keywords: three-port converter (TPC); maximum power point tracking; photovoltaic; switching boost converter three-port converter (TPC); maximum power point tracking; photovoltaic; switching boost converter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, S.; Gao, Y.; Yang, L. Research on Application of Non-Isolated Three-Port Switching Boost Converter in Photovoltaic Power Generation System. Electronics 2019, 8, 746.

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