单相高效光伏发电系统逆变器的研究-电气工程专业论文.docx

万方数据 万方数据 ABSTRACT Recently, with the rapid growth of the national economy, people’s energy consumption is increasing year by year in the production of life. The development and utilization of new energy must be put on the agenda. With the advantages of no pollution, short development cycle, unlimited reserves, solar power is favored by many countries. Photovoltaic power generation has become an important means to solve the energy crisis. In this paper, it makes a detailed study of the single-phase photovoltaic grid-connected inverter and focuses on the optimization of control method for the grid-connected inverter. Finally, the hardware and software design about photovoltaic grid-connected inverter has been given. First, the article introduces the background and significance of the photovoltaic power generation system, and makes a briefly description of the development status of PV power generation home and abroad, and some expectation is bring forward for the future direction of development of photovoltaic grid connected inverter. Secondly, the working principle of photovoltaic grid-connected inverter is analyzed in this paper. On the basis of analyzing the working principle of the inverter, photovoltaic grid-connected inverter control strategy has been studied. A grid current outer, inner ring capacitor current loop control strategy is established. In order to improve the system performance, the quality of output power of the inverter system, the fuzzy theory to optimize the original controller is introduced in this paper, which effectively improves the quality of output power and increase the conversion efficiency of inverters. According to the characteristics of fuzzy controller part prone to static error, optimizing the fuzzy PI controller, and building a model to validate. Thirdly, it has made a deeply research on the circuit design of photovoltaic inverter system, analyzed the inverter main circuit topology structure, and determined to use the no isolation t