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Abstract
High-gain DC/DC converters with high efficiency are needed in dc microgrid owed to the low voltage of power sources, e.g., photovoltaic-cell and fuel-cell. This paper proposed a new high-gain double-duty-triple-mode (DDTM) converter for dc-microgrid applications. The proposed DDTM converter operates in three modes to achieve higher voltage gain without utilizing transformer, coupled inductor, voltage multiplier, and multiple voltage lifting techniques, e.g., triple, quadruple voltage lift. The modes of operation of the converter are controlled through three switches with two distinct duty ratios (double duty) to achieve wide range duty ratio. The operating principle, voltage gain analysis, and efficiency analysis of the proposed converter are discussed in detail and to show its benefits comparison is provided with the existing high-gain converters. The boundary operating condition for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is presented. The prototype of the proposed converters with 500-W power is implemented in the laboratory and experimentally investigated, which validate the performance and feasibility of the proposed converter. Due to double duty control, the proposed converter can be controlled in different ways and the thorough discussion on controlling of the converter is provided as a future scope.
Highlights
Due to penetration of renewable energy sources, the power converter configurations are gaining more attraction in DC microgrid [1]
Owing to the low terminal voltage of power sources e.g. photovoltaic-cell (PV cell) and fuel-cell, high gain DC/DC converters with high efficiency are needed in DC
A new Double-Duty-Triple-Mode (DDTM) converter is proposed with high voltage gain for DC microgrid application
Summary
Due to penetration of renewable energy sources, the power converter configurations are gaining more attraction in DC microgrid [1]. 3) MODE III [t2 TO t3] Fig. 5(c) depicts the mode III equivalent power circuit of DDTM converter in which all the switches S1, S2, and S3 are turned OFF In this mode, the series connection of input voltage v1, inductor L1 and L2, and capacitor C1 supplied power to load (R) and charges the capacitor C2. Practically the converter suffer to achieve high stepup voltage gain due to the effect of the series resistance of capacitor and inductor, electromagnet interference (EMI), and need high rating components and semiconductor devices. Among converters discussed, the proposed DDTM converters provide high gain at given duty ratio and have higher duty range and required low voltage switches (except case 7; the converter mentioned in case 7 is restricted by duty ratio). Switches FDP19N40 are used to design the circuitry of the DDTM converter
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