Abstract
A high gain three port converter with a unidirectional port for photovoltaic (PV) side and two bidirectional ports one each for the battery and the DC bus for PV integration to DC microgrid is presented. High gain is achieved by a coupled inductor with switched capacitor, whereas single stage conversion is used between the ports to achieve high efficiency. The proposed converter is modelled in PLECS/MATLAB and the simulated results for various operational modes are validated using a 500 W prototype. For main operating mode, i.e., single input single output (SISO), the efficiency is calculated to be as high as 96 %. Similarly, owing to the reduced number of components, the losses are reduced considerably for different operation modes.
Highlights
The photovoltaic (PV) power generation increases day by day with global installed capacity of 505 GW at the end of year 2018 [1]
Multiple generation technologies need to be hybridized in order to have a steady availability of the power
The advantage of the coupled inductor-based topologies is that the required gain is achieved by an appropriate turns ratio leading to the decreased voltage stress
Summary
The photovoltaic (PV) power generation increases day by day with global installed capacity of 505 GW at the end of year 2018 [1]. The coupled inductor based techniques are preferred for the high voltage and medium frequency applications Based on these techniques, various high gain three port converters are presented in the literature [6]–[25]. The advantage of the coupled inductor-based topologies is that the required gain is achieved by an appropriate turns ratio leading to the decreased voltage stress. Increasing the turns ratio of the coupled inductor for achieving higher gain, it bears the disadvantages of higher leakage inductance, increased losses, and higher voltage spikes. The proposed converter is modified form of the topologies presented in [18], [19] with reduced number of active and passive components while improving the operation of the converter and increasing the efficiency. A coupled inductor along with switched capacitor are used to achieve high voltage gain, which will, enhance converter applications.
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