光伏发电系统及其最大功率跟踪控制的研究-电子与通信工程专业论文.docxVIP

Abstract Abstract 万方数据 万方数据 Abstract Solar power is a kind of renewable energy with various features--- environment-friendly, no noise, without production materials, and the application of solar energy has become a hot research topic in the field of new energy. Photovoltaic power generation is one of the most important ways of human use of solar energy, and during the 21st century, the global photovoltaic industry has developed rapidly. But it is a fact that the cost of solar cells is high and the utilization rate of that is low. To solve this problem, the especially important thing to do is to track the maximum power point of solar cells. In the photovoltaic-power-generation system, solar cells can convert solar energy into electric energy directly. The output characteristic of solar cells is affected by the light intensity, environment temperature and load, being of obvious non-linear characteristic. When the external environment changes, the voltage and the output power will change. So, to improve the efficiency of photovoltaic-power-generation system, we should use maximum power tracking control technique and adjust the operating point of photovoltaic cells real-timely to make it close to maximum power point. Based on the photovoltaic power generation system KNT-SPV01, this paper analyzes theoretically the principle and the structure of photovoltaic power generation system and studies the maximum power tracking control technique deeply. And the mini solar photovoltaic power generation systems with maximum power tracking controller is designed. There are four points as follows: Firstly, this paper studies the main characteristics parameters of the solar cell and achieves the output characteristic curve by real test in the external conditions, such as different light intensity, temperature. It’s found that the output characteristic curve of solar cells is influenced by different external conditions and is nonlinear. It’s proved that it’s necessary and feasible to