Abstract
The solar PV based power generation systems are growing faster due to the depletion of fossil fuels and environmental concerns. Combining PV panels and energy buffers such as battery through multi-port converter is one of the viable solutions to deal with the intermittency of PV power. The goal of this paper is to design and analyze the proposed triple port DC-DC buck-boost converter for high step-up/step-down applications. It has two unidirectional ports (port-1 and port-3) and one bi-directional port (port-2) for harnessing photovoltaic energy and charging the battery. At port-1, the combined structure of buck and buck-boost converter is used with a particular arrangement of switches and inductors. The step-up/step-down voltage conversion ratio is higher than the conventional buck-boost converter, and the polarity of the output voltage is maintained positive. The battery is added at the bi-directional port, for the storage of energy through the bi-directional boost converter. The switches operate synchronously for most of the modes making the control strategy simple. The characteristics and modes of operation along with a switching strategy, are elaborated. Experimental results are presented which validate the agreement with the developed theoretical expectation.
Highlights
Presently the fossil fuels like coal, oil and natural gas are being depleted at a steady rate and soon cease to exist
This converter required a large number of semiconductor devices with a high voltage rating
In light of the advantages of the tri-port DC-DC converter, this paper presents a new triple-port converter
Summary
The fossil fuels like coal, oil and natural gas are being depleted at a steady rate and soon cease to exist. In this case, inductor L3 is magnetized by battery supply (VBt ), and capacitor C0 is discharged through the load. In this case, inductor L3 is demagnetized in series with battery (VBt ) and transfers its energy to charge capacitor C0 through diode Dc. Diode D1, D2, and Dd are reverse biased. In this state slope of the inductor L1, L2 and L3 currents are negative In this state, the circuit from the battery (Port-2) to load (Port-3) is acting as a conventional boost converter; diodes D1, D2, DC are forward biased, and diode Dd is reverse biased.
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