Abstract
A nonisolated three-port DC–DC converter based on Cuk topology (NI-TPC) to handle the renewable sources (RS) is proposed in this paper. This converter includes two unidirectional input ports accommodating both a fuel cell (FC) and photovoltaic (PV) cell; and one output port with DC load. Due to the inductors at all the ports, it claims the advantage of continuous input and output currents. Additionally, it uses less number of switches, diodes and inductors compared with conventional ‘n-1’ separate Cuk converters. Synthesis procedure for a generalized n-port DC–DC structure is explained. The derivation law based on conventional Cuk converter, operating principle, design calculation, and analysis are presented in detail, and then the analysis is validated through simulation and a 100W prototype, verifying the performance of the proposed NI-TPC converter.
Highlights
Fast and society-threatening global warming and health hazards due to the combustion of fossil fuels have triggered the research and development of more efficient and cleaner renewable sources (RS) namely solar, wind, fuel cell etc
Multiport converters (MPC) which claim the advantage of component sharing are acknowledged as one of the promising topologies to integrate the RS to cater the future energy generation requirements
Ziegler–Nichols plus integral integral (PI) tuning was adopted to obtain the values of the proportional gain Kp and integral time Ti
Summary
Fast and society-threatening global warming and health hazards due to the combustion of fossil fuels have triggered the research and development of more efficient and cleaner renewable sources (RS) namely solar, wind, fuel cell etc. Compact structure and lesser conversion stages are the reasons to adopt MPC for numerous applications such as hybrid power system [4], renewable energy integration [5], hybrid vehicles [6], aerospace applications, and uninterrupted power supplies. This MPC, in particular, the three-port converter (TPC) can be divided into three groups: (1) the isolated DC–DC converter; (2) semi-isolated DC–DC converter; and (3) nonisolated converter topologies.
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