Abstract
This paper proposes a three-port Zeta-KY dc-dc converter which is fed with hybrid sources like photovoltaic (PV) cells and batteries. The converter proposed here is a multi-input single-output (MISO) structure which harnesses the benefits of Zeta and KY converters. The combination of these converters is highly advantageous since the Zeta converter provides lesser output voltage ripples with high gain and the KY converter topology suits well for withstanding load transients. The KY converter used in this research work is subjected to a topological change to facilitate bidirectional power flow. The bidirectional flow is essential to save the excess power in PV source in batteries during low load conditions. This novel multiport topology with bidirectional facility is first of its kind and has not been discussed earlier in the research arena. In the proposed work, two control algorithms are developed and deployed: the first one ensures the maximum power extraction from the PV and the second one maintains constant dc bus voltage and manages bidirectional power flow. MATLAB Simulink and hardware prototype of the proposed system has been realized for a 72 V dc bus and a 500 W electric vehicular drive. The simulation and experimental results reveal that the proposed system is viable for medium power electric shuttle applications. The proposed system is subjected to various test cases and it is observed that the source and load intermittencies are catered very well by the proposed three port Zeta-KY converter. The developed multiport converter is feasible for renewable energy applications.
Highlights
Power generation through distributed sources like photovoltaic, wind energy conversion systems, fuel cells are fast emerging
The proposed three-port novel Zeta–KY dc-dc converter topology has been developed for renewable energy applications
This multiport converter has been designed with a PV source and a battery as its essential embodiments in order to make optimum use of renewable energy source, the PV
Summary
Power generation through distributed sources like photovoltaic, wind energy conversion systems, fuel cells are fast emerging. Few converters from the above cited research works employed a greater number of components and complex control topologies for the power conversion. Fei Wang et al [24] proposed a Zeta converter that was fed from a PV source to feed a four-phase switched reluctance motor This MPC was developed based on series of voltage balance techniques. The Zeta converters integrated in [26,27] as multiport were isolated using transformers to obtain a high voltage gain for the distributed power generation. From the published research work based on the multiport converters using buck, boost, buck-boost, Sepic, Zeta, Cuk and KY converters, it is clear that the Cuk converter gives lesser output voltage ripples, but the output is inverted. The power loss should be zero in both ON and OFF states even though practically it is not the case
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