Abstract
Expandable Non-Isolated Multi-Input Single-Output DC-DC Converter With High Voltage Gain and Zero-Ripple Input Currents
Highlights
In recent years, different types of multi-input single-output (MISO) DC-DC converters are presented for photovoltaic (PV) systems to deliver the required power and regulated voltage
Single-input single-output (SISO) converters are suitable for low power applications in PV off-grid systems
The conventional technique to integrate several PV sources is to connect each PV source separately to a SISO converter with an individual controller, and the output power of each SISO converter is delivered to a DC bus [1]
Summary
Different types of multi-input single-output (MISO) DC-DC converters are presented for photovoltaic (PV) systems to deliver the required power and regulated voltage. The main contribution of this paper is to propose a multiinput single-output high step-up converter with the following advantages: 1) using a MISO converter (Fig. 1(b)) instead of several SISO converters (Fig. 1(a)) for integrated PV source applications can decrease the number of components and the size of the converter); 2) input current ripples in input ports are be cancelled for the whole range of duty cycles; 3) comparing to other conventional converters of same type, the proposed converter has the highest voltage gain (to increase the low input voltage of PV sources), and decreased power losses due to less component counts; 4) the proposed converter has low voltage stresses on diodes; 5) it has extendable structure with an extendable number of input ports (which can decrease the system’s cost when several PV sources are integrated); 6) the proposed converter has a single voltage gain function for the whole range of the duty cycle D (0< D
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