应用于光伏发电的直接交流堆叠式优化系统与并网技术研究

项目名称： 应用于光伏发电的直接交流堆叠式优化系统与并网技术研究

项目编号： No.51307096

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 张犁

作者单位： 清华大学

项目金额： 25万元

中文摘要： 组件级最大功率点跟踪（Maximum Power Point Tracking, MPPT）是获取光伏组件最大输出功率、提高系统安全性的一种有效手段，也是分布式光伏发电并网系统的重要发展方向。在实现组件级MPPT的基础上，如何提高系统能量转换效率和可靠性、降低系统硬件成本仍是亟待研究的重要课题。本申请项目研究一种基于微逆变器的交流堆叠式光伏并网发电系统结构及其控制策略和运行机制，包括：1）研究并网系统构成方式和优化配置方法；2）探索系统控制策略、运行机制和保障措施，包括电压电流协同控制和分布式幅相控制两种方法；3）着重分析和研究低增益非隔离型微逆变器拓扑，并结合实验获得优化的实例拓扑。研究成果将为实现一整套高效率、低成本、高可靠性且控制、保护功能完善的光伏发电并网系统提供完整的解决方案，并有力地促进分布式发电技术的发展。

中文关键词： 光伏；并网；分布式控制；串联逆变器；组件级MPPT

英文摘要： Module-level Maximum Power Point Tracking (MPPT) is an effective method to harvest the maximum output power from the photovoltaic (PV) module, and to improve the safety of the grid-connected system. Therefore, module-level MPPT is an important development direction of the distributed PV grid-connected generation. However, besides the module-level MPPT, how to improve the power conversion efficiency and reliability of the whole system, and reduce the system hardware cost? This should be further researched and developed. This project aims to investigate an optimal direct AC piled grid-connected PV generation system, as well as its control strategy and operational mechanism. The main research contents of this project are: 1) Investigation of both the structure and optimal allocation method of the AC piled grid-connected PV generation system; 2) Development of the control strategy, operational mechanism, and protection of the grid-connected PV generation system. Two control methods will be investigated, which are the coordination control for output voltage and output current, and the distributed voltage/frequency control; 3) Invention of low voltage gain transformerless micro-inverter topologies. The optimized topology will be selected through the experimental tests. Based on the above works, a whole solution of the

英文关键词： Photovoltaic；grid-connected；distributed control；series-connected inverter；module-level MPPT