钒液流电池储能系统在微电网中的应用

发布时间：2018-03-23 13:57

本文选题：全钒液流电池　切入点：三相全桥电压型整流器　出处：《内蒙古科技大学》2014年硕士论文

【摘要】：在光伏、风力等发电技术中，其波动性和随机性是制约新能源大规模发电的主要限制因素，微电网与储能技术配合工作、联合供电是解决这一问题的有效措施。在众多的大规模储能元件中，全钒液流电池作为一种新型的储能电池，由于其众多优点，在微电网中有广泛的应用前景，成为了新能源领域的研究热点。论文以液流电池储能单元辅助电网工作的应用为主体，开展了如下研究工作：文章首先介绍了微电网的国内外研究状况，列举了储能技术在微电网中的几个重要作用，分析比较了几种常见的储能技术的优缺点，并结合钒液流电池的应用优势，分析了它作为大规模电力储能元件在微电网发展应用中的可行性。介绍了钒液流电池的基本工作原理，比较它的几种经典模型，交流阻抗模型、含支路电流的三阶模型以及系统等效损耗模型。论文最终确定采用系统等效损耗模型，并建立了钒液流电池的电气模型，在Matlab/Simulink中搭建全钒液流电池的仿真模型。并对电池模型进行恒流充放电模拟，得到了VBR（Vanadium Redox Flow Battery）充放电过程中的电压变化曲线。双向变流器作为电力系统和能量存储系统的中间纽带，与储能系统运行的可靠性息息相关，本论文选用的是三相全桥电压型整流器。文中分析介绍了三相全桥VSR（Voltage Source PWM Rectifer）工作的基本原理，为实现既定的控制目标，首先建立了VSR详细的数学模型，然后使储能系统在微网联网运行工作中运用恒功率控制，孤岛运行工作中运用恒电压/恒频率控制。重点设计了实现两种控制具体的方式。并在Matlab环境中搭建仿真模型，，验证两种运行模式情况下控制方法的可行性，说明其对于微电网的稳定运行，具有一定的参考价值。
[Abstract]:In photovoltaic, wind power and other power generation technologies, its volatility and randomness are the main limiting factors restricting large-scale power generation of new energy, and microgrid and energy storage technology work together. The combined power supply is an effective measure to solve this problem. As a new type of energy storage battery, all-vanadium liquid flow battery is widely used in microgrid because of its many advantages. This paper focuses on the application of the liquid flow battery energy storage unit to the power grid, and carries out the following research work:. This paper first introduces the research status of microgrid at home and abroad, enumerates several important roles of energy storage technology in microgrid, analyzes and compares the advantages and disadvantages of several common energy storage technologies, and combines the advantages of vanadium liquid flow battery application. The feasibility of its application in the development and application of micro-grid as a large-scale electric energy storage element is analyzed. The basic working principle of vanadium liquid flow battery is introduced. Several classical models, AC impedance model, third order model with branch current and system equivalent loss model are compared. The electric model of vanadium liquid flow battery is established, and the simulation model of all vanadium liquid flow battery is built in Matlab/Simulink. The constant current charge-discharge simulation of the battery model is carried out, and the voltage change curve during the charging and discharging process of VBR(Vanadium Redox Flow battery is obtained. As the middle link between power system and energy storage system, bidirectional converter is closely related to the reliability of energy storage system. In this paper, the three-phase full-bridge voltage source rectifier is selected. In this paper, the basic principle of three-phase full-bridge VSR(Voltage Source PWM Rectifier is analyzed and introduced. In order to realize the established control goal, a detailed mathematical model of VSR is established. Then the energy storage system is controlled by constant power in the operation of microgrid network, and the constant voltage / constant frequency control is used in the operation of isolated islands. Two specific control methods are designed, and the simulation model is built in the Matlab environment. The feasibility of the two control methods under the two operation modes is verified, which shows that they have certain reference value for the stable operation of the microgrid.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM912

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