储能系统对独立微电网稳定性的作用研究

发布时间：2018-10-31 07:31

【摘要】：随着经济的发展和构建社会主义和谐社会的需要,新能源发电和微电网技术逐渐发展壮大起来,在我国西北等偏远地区受制于自然条件,清洁的风能资源较为丰富,所以多为风力发电。但是,新能源发电还有很多影响微电网系统电能稳定性的问题亟需解决,微电网在正常、持续的运行过程中离不开为其提供能量缓冲的储能系统,储能装置在微电网系统中扮演着十分重要的角色,而且储能设备种类繁多,使用上也很方便,为其稳定运行提供了极大的保障,本文着重研究了飞轮储能装置在含风力发电机的微电网系统在频率波动情况下的应用。首先,简单介绍了微电网的发展和储能系统在微电网中的应用情况,通过比较几种储能装置的特点,由于飞轮储能装置具有效率高,充放电速度较快,环保等优势,所以选择飞轮储能作为本次研究的储能对象用于调节风力发电系统中的频率波动。其次,介绍了飞轮储能装置的基本结构和工作原理,建立其充放电模型;对风电系统的功率特性及输出功率分类做了详细介绍,在此基础上又对微电网系统做了详细分析,包括它的功率传输特性,运行方式,控制方法及控制模式,为后面的仿真做准备。最后,在MATLAB/Simulink下进行仿真,考虑占空比改变的影响,转动惯量改变的影响,摩擦系数的改变影响对飞轮储能的充放电进行仿真,比较含飞轮储能和无储能情况下系统的频率变化情况,负载改变时含飞轮储能微电网的频率变化。仿真结果表明含飞轮储能装置可以对微电网系统频率波动起到抑制作用,证明了课题的可行性。
[Abstract]:With the development of economy and the need of building a harmonious socialist society, new energy generation and microgrid technology are gradually developed and strengthened. In the remote areas such as northwest China, they are constrained by natural conditions, and the clean wind energy resources are relatively rich. So most of them are wind power generation. However, there are still many problems that affect the power stability of microgrid system. In the normal and continuous operation of micro-grid, the energy storage system can not be separated from the energy buffer system. The energy storage device plays a very important role in the microgrid system, and there are many kinds of energy storage equipment, which is also very convenient to use, which provides a great guarantee for its stable operation. This paper focuses on the application of flywheel energy storage device in the case of frequency fluctuation in micro-grid system with wind turbine. Firstly, the development of microgrid and the application of energy storage system in microgrid are briefly introduced. By comparing the characteristics of several energy storage devices, the flywheel energy storage device has the advantages of high efficiency, rapid charge and discharge speed, environmental protection, etc. Therefore, the flywheel energy storage is chosen as the energy storage object in this study to adjust the frequency fluctuation in wind power system. Secondly, the basic structure and working principle of flywheel energy storage device are introduced, and the charging and discharging model of flywheel energy storage device is established. The power characteristic and output power classification of wind power system are introduced in detail. On this basis, the microgrid system is analyzed in detail, including its power transmission characteristics, operation mode, control method and control mode. Prepare for the following simulation. Finally, the effects of duty cycle, moment of inertia and friction coefficient on the charge and discharge of flywheel energy storage are simulated under MATLAB/Simulink. The frequency changes of the system with and without the flywheel are compared, and the frequency changes of the micro-grid with the flywheel are compared when the load changes. The simulation results show that the flywheel energy storage device can restrain the frequency fluctuation of the microgrid system, which proves the feasibility of the project.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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