本项目首次提出了多输入DC-AC变换开关组合单元和单级多输入集成DC-AC变换器新概念及其并联分时供电、串联同时供电、多绕组同时或分时供电型三类单级高效多输入集成DC-AC变换系统。对构成三类单级高效多输入集成DC-AC变换系统的电路结构与拓扑族、能量管理控制策略、原理特性、电路参数设计准则等关键技术基础进行深入的理论分析、仿真与原理试验研究，提供三类集成DC-AC变换系统原理试验装置。理论分析、仿真与原理试验将证实所提出的三类集成DC-AC变换系统的可行性和先进性。所提出的三类集成DC-AC变换系统能将多输入源单级变换成所需要的交流电，具有电路结构简洁、单级功率变换、功率密度高、变换效率高、可靠性高、成本低等优点。研究成果为实现高性能的新能源功率变换系统奠定关键技术基础，将在权威期刊和国际会议发表高水平论文8篇，出版学术专著１部，获授权国家发明专利６项，培养博士生3名和硕士生4名。

New concept of multi-input DC-AC conversion switching combination cell and a single-stage multi-input integrated DC-AC converter as well as single-stage multi-input integrated DC-AC conversion system with high efficiency are first proposed in this project. This system includes parallel supplying power individually mode, series supplying power simultaneously mode, and multi-winding supplying power individually or simultaneously mode. The key technologies basis such as the circuit configuration and topology families, the energy management control strategies, the principle characteristics, and the design criteria of circuit parameters of the three types of single-stage multi-input integrated DC-AC conversion system with high efficiency will be fully investigated in theoretical analysis, simulation and principle test, and the principle test prototypes of three types of integrated DC-AC conversion system will be provided. The feasibility and advancement of the proposed three types of integrated DC-AC conversion system will be verified by the theoretical analysis, simulation and principle test. The proposed three types of integrated DC-AC conversion system can convert multi-input sources to needed alternate current by single stage, and have advantages of simple circuit configuration, single stage power conversion, high power density, high conversion efficiency, high reliability, and low cost etc. The research fruits will lay key technical foundation on the realization of high performance new energy power conversion system. It is expected that 8 high-level papers will be published in authoritative journals and international conferences, 1 work will be published, 6 invention patents will be authorized, 3 PhD students and 4 postgraduate students will be trained.