基于多输入直流变换器的光伏与市电联合供电系统的研究

发布时间：2018-03-14 20:44

本文选题：新能源联合供电　切入点：多输入直流变换器　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了缓解能源危机和环境问题,新能源的开发利用越来越受到人们的重视。但一些新能源受到自身的和环境的各种因素制约,具有供电不连续、不稳定等缺点。可以利用新能源各自具有的特性和各种新能源之间的联系,将多种新能源发电形式组合起来构成新能源联合供电系统,并对这些能源形式进行合理的能量分配,便可使系统更加稳定和连续,还可实现能源的优化利用。在新能源联合供电系统中,使用单个多输入直流变换器(Multiple-Input Converter,MIC),而不是以往的多个单输入直流变换器,如此可以简化系统结构和降低系统成本。太阳能作为一种具有无限免费资源的可再生清洁能源,现已受到世界各国学者的广泛研究。在易于获得的地区,市电作为一种稳定的能源,非常适合作为太阳能的补充能源来弥补太阳能受外界环境限制大的缺点。本文由联合供电系统的概念引入到多输入直流变换器,首先介绍了多输入直流变换器的基本结构和组成单元,然后由这些组成单元按照一些级联规则得到了各种类型的MIC电路。然后本文以双输入Buck变换器作为例子,分析了此类MIC的基本原理和电路特性,并给出了基于光伏与市电联合供电系统的能量管理策略。该变换器具有电路简单、控制灵活、两路输入源可以同时给负载供电的优点。为了实现太阳能电池和市电之间的能量合理分配,就需要弄清楚二者的工作特性。本文介绍了太阳能电池的工作原理和工作特性,对太阳能电池进行了数学建模,并在Matlab/Simulink中搭建了仿真模型,并结合市电搭建了基于双输入Buck变换器的光伏与市电联合供电系统的仿真模型。为了实现太阳能电池的优先利用,能量管理在新能源联合供电系统中是必不可少的。能量管理的核心思想为使系统工作在三种工作模式下,使负载尽可能多地使用太阳能电池所提供的能量,剩余能量由市电补充。本文结合双输入Buck变换器,采用两个调节器,一个调节太阳能电池的功率使其以最大功率输出,另外一个调节输出电压使其稳定在额定电压。本文最后搭建了一台200W的基于双输入Buck变换器的光伏与市电联合供电系统进行了实验验证,实验结果验证了系统的工作原理是正确的,所采用的能量管理策略也是合理的。
[Abstract]:In order to alleviate the energy crisis and environmental problems, people pay more and more attention to the development and utilization of new energy. Instability and other shortcomings. It is possible to combine various forms of new energy generation to form a new energy joint power supply system using the characteristics of each new energy source and the linkages between various new sources of energy, and to allocate these forms of energy reasonably. It can make the system more stable and continuous, and realize the optimal utilization of energy. In a new energy supply system, a single multi-input DC / DC converter, Multiple-Input converter, is used instead of the previous single-input DC / DC converter. Solar energy, as a renewable and clean energy source with unlimited free resources, has been extensively studied by scholars all over the world. As a kind of stable energy, municipal power is very suitable as a supplementary energy of solar energy to compensate for the limitation of solar energy by external environment. In this paper, the concept of joint power supply system is introduced into multi-input DC / DC converters. This paper first introduces the basic structure and components of multi-input DC / DC converters, and then obtains various types of MIC circuits according to some cascade rules by these components. Then, this paper takes double input Buck converters as an example. The basic principle and circuit characteristics of this kind of MIC are analyzed, and the energy management strategy based on photovoltaic and municipal power supply system is given. The converter has the advantages of simple circuit and flexible control. In order to realize the reasonable distribution of energy between solar cells and municipal electricity, we need to find out their working characteristics. The working principle and characteristics of solar cells are introduced in this paper. The mathematical model of solar cell is established, and the simulation model is built in Matlab/Simulink, and the simulation model of photovoltaic and municipal power supply system based on dual-input Buck converter is built. In order to realize the preferential utilization of solar cell, the simulation model of photovoltaic and municipal power supply system based on dual-input Buck converter is built. Energy management is essential in a new energy supply system. The core idea of energy management is to make the system work in three modes, so that the load uses as much energy as possible from solar cells. The residual energy is replenished by municipal power. In this paper, two regulators are used in combination with dual input Buck converter, one adjusts the power of the solar cell to make it output with maximum power. The other one adjusts the output voltage to make it stable at rated voltage. Finally, a 200W photovoltaic and electric power supply system based on dual-input Buck converter is built. The experimental results show that the principle of the system is correct and the energy management strategy is reasonable.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM72

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