Abstract
A novel non-isolated three-port converter (TPC) is analyzed and evaluated for a photovoltaic (PV)-battery hybrid power system application. An interleaved bidirectional Buck/Boost converter and a semi-active full-bridge rectifier are connected in a stack configuration to provide three power ports, i.e. a PV input port, a battery storage port and an output load port, simultaneously. Single-stage power conversion between any two of the three ports is achieved, while independent power control of two of the three power ports is realized by adopting PWM plus phase-shift modulation strategy. In addition, soft-switching can be achieved for all active switches. The operation principles, modulation and control strategies are analyzed in detail, design considerations of this TPC are presented as well. Performance of this TPC is further evaluated with experimental results.
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