含多种互补能源的光伏直流微网系统研究

为促进分布式光伏发电顺利接入大电网并发挥其优势，本项目以含多种能源的光伏直流微网作为研究对象，结合杭州电子科技大学的"可再生能源发电与微型电力网技术实验室"的光伏直流微网技术平台，主要研究两部分内容：（1）光伏直流微网构建时所涉及到的关键技术研究，包括直流微网母线电压优化及纹波抑制技术、直流变换单元的控制技术等。其中直流变换单元的控制技术是这部分的重点研究内容，包括多种互补能源的直流变流器的协调控制技术、兼具最大功率跟踪功能(MPPT)和可调度功能的光伏直流变流器的控制技术等。（2）光伏直流微网运行所涉及到的关键技术研究，具体包括光伏直流微网系统的并网点潮流控制、光伏直流微网系统在孤岛状态下的自适应负荷运行、光伏直流微网系统的并网/孤岛运行的无缝切换和蓄电池的优化运行等。本项目是对含多种能源的光伏直流微网的全面系统地研究，研究成果有助分布式光伏发电的推广。

To promote the smooth access of distributed photovoltaic to grid and exert its advantages, the photovoltaic DC micro-grid with multi-energy resources is selected as the research object. The research is based on the photovoltaic power generation micro-grid platform located in the "renewable energy power generation and micro power grid technology lab" in Hangzhou Dianzi University. The main research content consists of two parts: (1) Research on the key technologies of forming a photovoltaic dc micro-grid including Bus voltage optimization and Bus voltage ripple suppression techniques, control schemes of DC converters, fault and protection of micro-grid, etc. Among them, the control scheme of DC converters is the key research content, which includes the coordinated control of these multi-energy resources and the control of the DC photovoltaic converter with MPPT function and schedule function. (2) Research on the key technologies of the photovoltaic DC micro-grid including constant power flow control in the joint point between micro-grid and grid, self-adjust operation with load under island operation, smoothly switching between grid-connection and island, optimized operation of battery etc. This project is a comprehensive study on the photovoltaic DC micro with multi-energy resources. The research results will help the practical application of distributed photovoltaic power generation and promotion.