基于直流微电网的光伏并网功率转换装置设计与运行仿真
摘要
Abstract
Micro-power grid is a kind of green renewable energy which is widely used at home and abroad at present. In recent years, micro-power grid industry has developed very rapidly. Then, more and more microgrid systems are built and connected to the grid. The electric energy generated by microgrid is greatly affected by external factors and has certain randomness and volatility, which has a huge impact on the stability of the grid-connected power system. The best way to improve this situation is to build energy storage system of microgrid plant. Therefore, in recent years, the equipment, capacity configuration and combined operation control of energy storage devices in microgrid field have become a hot topic in research and application demonstration.
Facing the increasingly serious global energy crisis, the development and utilization of renewable energy has been attached great importance. Which radiation to the earth's solar energy resources are very rich, green and clean solar energy will not harm our living environment, so it has been widely used by people. Photovoltaic power generation as a renewable energy is widely used, technology innovation. In order to improve the photoelectric conversion efficiency of photovoltaic power generation system, it is necessary to track the maximum power point in real time.
Due to the improvement of people's living standards, continuous progress of science and technology, and continuous improvement of control, non-renewable energy consumption is serious, or even exhausted, thus promoting renewable energy to become the dominant industry. Photovoltaic power generation has become a beautiful landscape at the present stage. Due to its advantages of mature development technology, relatively small cost and almost no pollution, it has a high prospect in the new energy power generation industry and has become the focus of attention in the world. At the same time, due to the strong variability, randomness and uncontrollability of illumination intensity, the stability of photovoltaic power generation system is greatly affected. The photovoltaic power generation industry continues to innovate, generating more and more power. So the new generation of us to seriously delve into the impact of photovoltaic power generation.
Microgrid is the key to solve the problem of power system stability. Compared with the traditional AC distribution network, DC microgrid has technical and economic advantages and has a huge development prospect. This paper mainly focuses on the design and operation of photovoltaic grid-connected power conversion in DC microgrid. Based on the study of the common bus structure of microgrid and the mathematical models of different microgrids of photovoltaic, battery and inverter, different control strategies and practical operation modes are formulated. In the Matlab/Simulink simulation, a simple micro-grid model based on photovoltaic, energy storage and other micro-power sources is built, thus verifying the operation mode and control mode of different micro-power sources.
Keywords: Dc microgrid, grid-connected inverter, photovoltaic, power conversion
目录
摘要............................................................................................................................. I
Abstract................................................................................................................... III
第一章 绪论............................................................................................................. 1
1.1研究课题背景............................................................................................. 1
1.2国内外关于光伏发电并网控制的发展状况.......................................... 5
1.3并网逆变器发展现状和发展趋势.................................................... 6
1.4课题研究意义............................................................................................. 7
1.5 研究内容及章节安排............................................................................... 8
第二章 光伏发电系统的组成................................................................................ 8
2.1光伏发电系统的基本组成........................................................................ 8
2.2光伏发电系统的分类................................................................................ 9
2.3光伏发电系统的应用.............................................................................. 10
2.4小结........................................................................................................... 11
第三章 光伏并网逆变系统及其控制技术......................................................... 11
3.1光伏并网逆变系统.................................................................................. 12
3.2 并网逆变系统滤波器....................................................................... 12
3.2.1 LCL 型滤波器模型.............................................................. 13
3.2.2 无源阻尼................................................................................ 15
3.2.3 有源阻尼................................................................................ 17
3.2.4 混合阻尼................................................................................ 19
3.3 单相并网逆变器系统模型分析................................................ 20
3.3.1 单相并网逆变器系统概述............................................ 20
3.4 LCL 型滤波器控制策略.................................................................. 22
3.4.1 网侧电流反馈模型............................................................... 23
3.5 本章小结............................................................................................ 24
第四章 光伏发电单相并网逆变器的仿真........................................................ 24
4.1 光伏发电单相并网逆变器的仿真模型搭建....................................... 24
4.2仿真结果分析.......................................................................................... 26
4.3小结........................................................................................................... 29
第五章 总结........................................................................................................... 29
参考文献................................................................................................................. 30
致 谢................................................................................................................. 31
第一章 绪论
1.1研究课题背景
1.2国内研究现状
1.2.1微电网现状与趋势
对于可再生能源利用中的电力电子技术以及控制技术国内外均已经开展了较多的研究,但是由于风光互补分布式微电网的许多特性与并网型应用具有不同,因此相应的电力电子装置及控制技术均要做相应的改变。
在风力、太阳能等发电领域,国内已经有多项专利。但是,有关高智能化的新能源分布式发电系统方面的专利很少,而多种可再生能源的集成综合利用系统方面则更少。因此需要研究和探讨合适的风光互补分布式微电网技术。
我国海域辽阔,岛屿众多,海岛资源丰富、区位特殊,是中国海洋经济和社会发展的重要依托。因地制宜,就地取材,开发海岛新能源,是解决海岛能源问题的重要举措。
农村特别是在山区的农村,缺电现象仍然十分严重,农村生物质能、太阳能、风能资源都很丰富,小功率户用电源系统在农村有很好的市场前景,基于微网概念的户用电源产品将在未来的农村电网中扮演重要的角色。
1.2.2微电网并网问题研究现状
近几年,世界各国专家都在积极研究微电网并网的相关问题解决办法,目前主要需要解决的困难如下所示:
随着并网采用微电网的情况下,微电网输出功率变化较大,使国家电网出现波动。
1.2.3微电网储能技术发展现状
由于储存能源的设备能够在适当的时间动态地储存和输出能量,它们可以将来自不稳定但便宜能源的电力储存到稳定和经济水平。同时储能技术仍是新能源发展的瓶颈,全球各新能源研发单位都在积极研究储能方面的知识。
1.2.4微电网的特点
分布式发电包括小型水利发电、新型可再生能源(风能、太阳能、生物质能、海洋能、地热能)发电、不可再生能源发电(微型燃气轮机、燃料电池、垃圾发电、冷热电联产等)和储能电源发电。
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