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This paper presents a high step-up scalable voltage multiple cell (SVMC)-based DC/DC converter, which has the features of high gain, low and adjustable components stresses and automatic input-current sharing in each input-phase. In virtue of above features, the converter is applicable for the DC collection grids for offshore wind farms. In this paper, the converter in terms of working principle and property characteristics are analysed with 4 input-phases and 3 SVMCs. The converter has also been evaluated in terms of the component stress and voltage conversion ratio against some other converters for high power occasions. Moreover, a 2.5MW simulation model and a 1.2kW prototype were constructed for verification.

A non-isolated high-voltage gain dual-input DC/DC converter with a zero voltage turn-off (ZVT) auxiliary circuit has been presented. Two photovoltaic (PV) modules can be connected to the proposed converter with separate maximum power point tracking (MPPT). The cost of whole PV power generation system can be decreased significantly as a single converter is employed instead of two converters. All switches can achieve ZVT by an auxiliary circuit, and turn-off switching losses can be decreased and the efficiency of the converter can be improved. Working principle and performance characteristics of the proposed converter are analysed in detail, a dual-input maximum power point tracking control algorithm has been designed for the proposed converter. An 800 W experimental prototype has been built to verify the theoretical analysis.