V2G技术与电力电子变换器的性能紧密相关，这使双向AC/DC变换器成为近年来该领域的研究热点。本申请针对双向AC/DC变换器具有多个不同电路组成部分及工作模式的特点，提出了以现有电路结构中的一部分进行拓扑复用这一新的概念来研究双向AC/DC变换器。具体研究工作将包括：双向AC/DC级电路拓扑复用，双向DC/DC级电路拓扑复用以及前后级电路间的拓扑复用研究。同时，分析这些复用技术与系统其他部分的工作模式、参数设计、性能指标与控制策略等可能的冲突和影响，提出系统的理论分析方法与设计方案。本项目还将结合在双向AC/DC变换器中实现基于Droop控制的柔性微网控制策略，使其具备能自组网的特性，并在此基础上研究其与拓扑复用技术的相互影响。本课题的研究工作对于改善V2G变换器的特性，拓展其应用功能具有重要的理论研究价值与实际意义，将有利于我国V2G技术的发展，推动V2G技术与智能电网的结合。

Power electronics converter is the critical technique in V2G concept, which makes the bidirectional AC/DC converter as the hottest research topic in this area. Based on the features as the bidirectional AC/DC converter employs different circuits and different functions, the topology multifunctioning concept is proposed in this proposal. The topology multifunctioning refers to the utilization of the idle resources as circuit components to perform new functions, and perhaps together with other devices already in working. The research of the topology multifunctioning will include the bidirectional AC/DC inverter, bidirectional DC/DC converter and the crossover of these two stages. Also the analyses of the effects and conflicts of these multifunctioning with original working patterns, parameter selections and control strategy will be performed. Droop control will also be included to make the V2G converter suitable for voltage-parallel and the construction of flexible microgrid, also the interaction between the controller and possible multifunctioning methods will be investigated. All above works with topology multifunctioning research are deemed to improve the performance and also induce new functions to the V2G converters without auxiliary components. And the related research results will greatly promote the research level and application of V2G concept in China in the near future.