韶关地区以小水电为主要电源的微网规划和建设问题研究

发布时间：2018-05-25 06:07

本文选题：分布式小水电 + 微网　；参考：《华南理工大学》2014年硕士论文

【摘要】：韶关地区水电资源丰富、水电总装机容量大，但是大部分为无调节能力的径流电厂，部分蓄水式电厂的水库调节能力也只能达到季调节能力，这些小水电大多直接接入供电网络，专线上网占比很小。此种小水电及其接入电网有较大的局限性。本文研究韶关地区以小水电为主要电源的微网的结构域、负荷频率响应、运行和控制问题，以及小水电线路要发展为微网涉及的技术改造问题。本文的主要内容包括：一、介绍了分布式小水电的特点及其接入电网的结构、和对接入电网的在电压波动、功率因数、主要影响、供电可靠性、继电保护和自动装置设置问题等方面的影响；二、通过介绍小水电接入电网三种等效结构给出了完整的微网结构，以及介绍了微网中起到网络监控和保护的负荷管理与控制系统、发电管理与控制系统、紧急情况应急系统等装置；三、采用MATLAB软件对微网的负荷频率特性进行仿真研究，通过研究表明，单纯用小水电来调频时，频率波动频繁且不稳定，接入其他形式电源和储能装置，频率的波动明显减小，频率偏差也能控制可接受范围；四、最后着重介绍了微网的运行问题和控制问题，主要是孤岛运行状态和并网运行状态的特点和运行要求、微网控制的方法，以及在孤岛运行状态与并网运行状态之间切换时的频率和电压值的仿真分析。本文在最后总结得出了小水电线路的技术改造方法，，主要有上网线路和负荷线路分离、加装无功补偿调压装置、保护装置的改造三个方面，还总结了要将小水电线路发展成为微网要考虑的几个问题，主要包括发展多种形式电源、增加储能装置、并网运行要求、监控措施改造等方面。这些结论将对富含小水电地区的配电网规划和建设工作起到一定的指导意义。
[Abstract]:Shaoguan area is rich in hydropower resources and has a large total installed capacity of hydropower, but most of them are runoff power plants with no regulating capacity, and the reservoir regulation capacity of some water storage power plants can only reach seasonal regulation capacity. Most of these small hydropower directly connected to the power supply network, the proportion of dedicated lines to the Internet is very small. This kind of small hydropower and its access to the power grid has greater limitations. In this paper, the structural domain, load frequency response, operation and control of the micro-grid with small hydropower as the main power source in Shaoguan area are studied, and the technical transformation problems involved in the development of the small hydropower line to the micro-grid are also studied in this paper. The main contents of this paper are as follows: first, the characteristics of distributed small hydropower and the structure of connecting to the power grid, and the voltage fluctuation, power factor, main influence, power supply reliability of the access network are introduced. The effects of relay protection and automatic device setup are discussed. Secondly, the complete microgrid structure is given by introducing three equivalent structures of small hydropower connected to the power network. The load management and control system, power generation management and control system, emergency system and so on are introduced. Thirdly, the load frequency characteristics of microgrid are simulated by using MATLAB software. The study shows that frequency fluctuation is frequent and unstable when only small hydropower is used for frequency modulation. When other forms of power supply and energy storage device are connected, the frequency fluctuation is obviously reduced, and the frequency deviation can also control the acceptable range. Finally, the operation and control problems of microgrid are introduced, including the characteristics and requirements of island operation and grid-connected operation, and the method of microgrid control. The simulation analysis of frequency and voltage between island operation state and grid-connected operation state is given. In the last part of this paper, the technical transformation methods of small hydropower lines are summarized, including separation of power lines from load lines, installation of reactive power compensation and voltage regulation devices, and reconstruction of protective devices. Several problems to be considered in the development of small hydropower lines into microgrids are also summarized, including the development of various forms of power supply, the addition of energy storage devices, the operation requirements of grid connection, the improvement of monitoring measures, and so on. These conclusions will play a certain guiding role in the distribution network planning and construction in the area rich in small hydropower.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM715;TV742

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