Abstract
High step-up nonisolated multicellular dc-dc converter has been newly proposed for PV microconverters. The multicellular converter consists of the nonisolated step-up cell converters using bidirectional semiconductor switches, and these cell converters are connected in Input Parallel Output Series (IPOS). The voltage transformation ratio of the step-up converter is N/(1-D) in case all the transistors in N cell converters are operated at the duty ratio of D. The proposed multicellular dc-dc converter also accomplishes high efficiency because of no magnetic coupling such as the high frequency transformer and the coupled inductor. Laboratory prototype has been fabricated to show the feasibility of the proposed converter. Design consideration for the 20 V–40 V to 384 V, 240 W nonisolated multicellular dc-dc converter has been also conducted, and the potential to achieve the efficiency of 98% has been shown. The proposed multicellular converter contributes to realizing the environmentally aware data centers for future low carbon society.
Highlights
Aware data centers have been proposed by NTT (Nippon Telegraph and Telephone Corporation) to realize highly electrified low carbon society [1, 2]
The multicellular converter consists of the nonisolated cell converters and these cell converters are connected in Input Parallel Output Series (IPOS)
The circuit configuration of the cell converter is based on the typical boost chopper topology, and the fundamental characteristics of the proposed converter are explained by the space-state averaging method [3, 12, 21]
Summary
Aware data centers have been proposed by NTT (Nippon Telegraph and Telephone Corporation) to realize highly electrified low carbon society [1, 2]. The environmentally aware data center reduces the conversion loss by introducing 380 V dc distribution system and minimizes the environmental impact by installing the solar PV power systems into the 380 V dc distribution system. The low input voltage and low output power dc-dc converter (microconverter) is installed into each solar module and all of microconverters are controlled to achieve MPPT (Maximum Power Point Tracking). One of issues for the microconverter concept is the high step-up voltage transformation ratio (voltage gain: output voltage/input voltage) of 10–20. It is difficult to develop the high step-up microconverter by the general nonisolated boost chopper circuit because of the parasitic resistance [3]. Solar power systems to minimize environmental impact of data centers dc/dc dc/dc ac//dc ac 200 V. conducted and the potential to achieve high efficiency is presented
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