组件级电力电子变换技术（MLPE）与分布式光伏、户用光伏结合起来具有众多优势，代表了未来光伏发电技术发展的重要方向。目前MLPE越来越受到国内外学术界与工业界的重视，但是如何解决好其面临的成本、控制、拓扑等一系列关键问题，对其发展与大规模应用具有决定性意义。本课题将结合MLPE与分布式光伏应用的实际特点，针对这些关键问题开展研究工作，探寻并提出有效的组件级电力电子变换技术方案，对未来MLPE的发展从模块控制、电路拓扑、系统架构、系统控制方案等方面给出理论指导与分析设计依据。本课题的研究工作对于提高组件级变换技术的性能，有效降低其成本，提高寿命与可靠性，使得组件级光伏变换技术真正得以大规模推广具有重要的理论意义与实际工程价值，将有利于推动我国组件级光伏技术的发展。

PV system with Modular Level Power Electronics (MLPE) which including microinverter, power optimizer and smart module, has shown great development in the past years. MLPE has the advantages as modular level MPPT performance which is very attractive in distributed PV system, especially residential system. This project will focus on the key techniques of the MLPE, as the low cost, high performance MPPT and MLPE control strategy, the optimization of the topology for microinverter and power optimizer, and research on the system configuration and control strategy based on MLPE. Also, the analysis and design methodology for the MLPE and the system will also be performed in the project. All above works are deemed to improve the MLPE performance, expected lifetime and reliability, while reduce its cost. And the related research outcomes will greatly promote the research level and application of MLPE concept in China in the near future.