单相光伏并网系统的MATLAB仿真研究

发布时间：2018-04-27 16:59

本文选题：太阳能 + 光伏并网　；参考：《天津理工大学》2014年硕士论文

【摘要】：随着我国全年国内生产总值的不断提高，对不可再生能源的依赖明显过度。目前，能源危机问题日益明显，所以，新型能源的应用受到了越来越多的重视。其中，太阳能的可再生性以及清洁性等特点使其备受世界各国的关注，光伏并网系统也成为新型能源开发领域的一个重点发展方向。本文从提高光伏系统并网稳定性的角度出发，对光伏并网发电系统中的电池特性、逆变器控制策略、孤岛检测等问题开展了深入研究。本文首先对光伏并网系统的背景及意义进行了介绍，对光伏并网系统的构成及应用进行了分析。之后，在MATLAB/SIMULINK环境下对模型进行了仿真，分析光强和温度对其输出的影响。然后，对目前常用的几种光伏并网控制策略进行了介绍，在进行比较后得出：使用电网电压前馈和锁相环技术的复合控制效果更为理想，，并且在MATLAB环境下的总谐波畸变率更小；另外，研究了并网系统在孤岛效应下的影响问题，对常见的孤岛效应检测方式进行了改进，缩短了反应时间，提高了并网系统的可靠性。
[Abstract]:With the continuous increase of GDP in China, the dependence on non-renewable energy is obviously excessive. At present, the problem of energy crisis is becoming more and more obvious, so the application of new energy has been paid more and more attention. Among them, the renewable and clean characteristics of solar energy have attracted the attention of the world. Photovoltaic grid-connected system has also become a key development direction in the field of new energy development. From the point of view of improving the stability of grid-connected photovoltaic system, the cell characteristics, inverter control strategy and islanding detection in photovoltaic grid-connected generation system are studied in this paper. In this paper, the background and significance of grid-connected photovoltaic system are introduced, and the structure and application of grid-connected photovoltaic system are analyzed. Then, the model is simulated in MATLAB/SIMULINK environment, and the influence of light intensity and temperature on the output is analyzed. Then, several commonly used photovoltaic grid-connected control strategies are introduced. After comparison, it is concluded that the composite control effect of using voltage feedforward and phase-locked loop technology is more ideal, and the total harmonic distortion rate in MATLAB environment is smaller; In addition, the influence of the grid-connected system under the islanding effect is studied, and the common detection methods of the islanding effect are improved, the reaction time is shortened and the reliability of the grid-connected system is improved.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

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