A novel input voltage sharing control strategy for input-series output-parallel system with high reliability

Input-series and output-parallel (ISOP) system, in which multiple converter modules are connected in series at the input sides and parallel at the output side, is very suitable for high input-voltage applications. Input voltage sharing and output current sharing of the constituent modules among the ISOP system must be ensured. A novel wireless input voltage sharing control strategy for ISOP system based on positive output voltage gradient method is proposed in this paper, which can effectively improve the reliability and modularity of the ISOP system. The operation principle of the proposed control strategy is introduced and the stability of the proposed control strategy is also explored. A three-module ISOP system prototype is built in the lab and the experimental results verify the effectiveness of the proposed control strategy.