Research on key performance of novel interleaved parallel high-gain DC/DC converter

摘要

Due to the problem of the low output voltage of photovoltaic power generation system and the high demand for DC bus voltage in grid connection, a non-isolated high-gain DC/DC converter with a voltage multiplier cell (VMC) structure is proposed. The converter provides equal current between each phase of VMC, the voltage ripple of each stage can be effectively suppressed, and achieve high gain at low duty cycle. The steady-state analysis of the converter in continuous conduction mode is given, and an experimental prototype with an output power of 200 W is developed. The experimental results show these advantages which are the output voltage level of converter can be adjusted by increasing or decreasing the number of VMC unit according to the demand, and each stage of VMC has equal current, and the voltage ripple can be effectively suppressed, as well as the use of staggered parallel input form suppresses the input current ripple and is controlled easily.