High-Efficiency Solar Photovoltaic System Design And Optimization Analysis

The problem of conventional energy crisis and environment in the world makes it necessary to exploit the renewable and green energy sources, in order to cover the future demands. Meanwhile, solar photovoltaic power has made great progress and become one of the most effective clean and renewable energy with the advance of solar cell and power electronics. Recently, the photovoltaic system constantly develops with the tendency of lower cost, higher efficiency and higher power density techniques, following the higher and higher performance requirement of key equalizer equipments. The main application of solar energy will be the grid-connected photovoltaic system. With coming into using of the high-performance Digital Signal Processor (DSP) chip, it is possible that some advanced control strategies can be applied on the grid-connected PV system.Generally, a fundamental photovoltaic energy system consists of the solar cell, solar controller, converter and batteries. In particular, the solar controller is the hard core of the system. In the paper, Firstly, summarizing the composing of the photovoltaic energy system, introducing the presently technology application of the system in our country and according to different needs classing three structures. Then, the thesis addresses the solar grid-connected photovoltaic system. With considering the cost, reliability and efficiency, it mainly focuses on the optimal design and control strategies of grid-connected photovoltaic system.Finally, to make PV power more competitive is achieved by developing inexpensive and reliable inverters. According to the standards of grid interface and PV module interface determined by the project, research has been conducted on kinds of popular inverter topologies. By generalizations and comparisons, a dual full bridge inverter topology is presented. On such basis, the inverter, with belonging auxiliary circuits, is designed. And an optimization method of LCL output filter is proposed. As a whole, the inverter is developed with low cost, high reliability and high efficient structure.In addition, by applying the scene collecting data and monitoring systems in the solar photovoltaic project, the efficiency of photovoltaic power generation system has been discussed. Test results show that the solar photovoltaic power system by designing and optimizing in the paper is of a high efficiency system.