Nonisolated Multiport Converters Based on Integration of PWM Converter and Phase-Shift-Switched Capacitor Converter

Photovoltaic (PV) systems having rechargeable batteries are prone to be complex and costly because multiple converters are necessary to individually regulate a load, PV panel, and battery. This paper proposes novel nonisolated multiport converters (MPCs) integrating a bidirectional pulsewidth modula...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 35; no. 1; pp. 455 - 470
Main Authors Sato, Yusuke, Uno, Masatoshi, Nagata, Hikaru
Format Journal Article
LanguageEnglish
Published New York IEEE 01.01.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Batteries
Bidirectional pulsewidth modulation (PWM) converter
Capacitors
Circuits
Converters
Energy conversion efficiency
Inductors
multiport converter (MPC)
nonisolated dc–dc converter
Phase shift
phase-shift-switched capacitor converter (PS-SCC)
Photovoltaic cells
Pulse duration modulation
Pulse width modulation converters
Rechargeable batteries
Switches
Switching circuits
Topology
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Summary:Photovoltaic (PV) systems having rechargeable batteries are prone to be complex and costly because multiple converters are necessary to individually regulate a load, PV panel, and battery. This paper proposes novel nonisolated multiport converters (MPCs) integrating a bidirectional pulsewidth modulation (PWM) converter and phase-shift-switched capacitor converter (PS-SCC) for standalone PV systems. A PWM converter and PS-SCC are integrated by reducing the total switch count, realizing the simplified system and circuit. In the proposed MPCs, two control freedoms of duty cycle and phase shift angle are manipulated to individually regulate the load, PV panel, and/or battery. The detailed operation analysis was performed to mathematically derive gain characteristics and zero voltage switching operation boundaries. For the battery discharging mode, in which the PV panel is not available and the MPC behaves as a single-input-single-output converter with two control freedoms available, the optimized control scheme achieving the lowest rms current is also proposed to maximize power conversion efficiencies. Various kinds of experimental verification tests using a 200-W prototype were performed to verify the theoretical analysis and to demonstrate the performance of the proposed MPC.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2912550