The grid-connected techniques for input-series-output-series LCL-type inverter system

摘要

Input-series-output-series (ISOS) inverter system is very suitable for high input voltage and high output voltage power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and simplify system design. For the ISOS grid-connected inverter system, there are multiple control targets including power balance between modules and high power factor of the grid current. To solve these issues, a novel control strategy is proposed in this paper. Also, simulation and experimental results are presented to prove the effectiveness of the strategy.