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A high step-up-ratio DC/DC converter for photovoltaic energy integrated into high voltage DC grids is proposed in this paper. The converter is mainly composed of modular DC/DC conversion modules which are configured as input-parallel-output-series structure. The proposed module is consisted of two power stages, with a boost circuit as the first stage and a narrow-switching-frequency-variation LLC...
A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The proposed system has a distributed MPPT and centralized step-up DC-DC configuration. By employing distributed MPPT converter, high power losses caused by partial shading of the PV arrays can be reduced significantly. Modular scheme is adopted for the centralized...
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