新能源电力系统优化运行与小扰动稳定分析

发布时间：2018-01-16 06:05

本文关键词：新能源电力系统优化运行与小扰动稳定分析　出处：《华北电力大学(北京)》2016年硕士论文　论文类型：学位论文

【摘要】：当今经济社会在飞速发展的同时,也伴随着化石能源耗竭和环境恶化的巨大压力。面对能源困局,风电等新能源因其储量巨大、低碳环保等巨大优势获得了快速发展。我国风能丰富,风电产业发展迅猛,但却在“三北”地区存在着严重的弃风现象。本文通过对新能源电力系统的弃风原因进行分析的基础上,提出在供暖管网节点上安装带有电锅炉和储热罐的热力站,通过配合CHP机组的运行帮助其解耦“热电联耦”约束,进而提升系统调峰能力并促进风电消纳的优化运行方案。同时,由于风电等新能源发电存在间歇性、波动性等特点,会对电力系统的安全稳定性造成一定的影响。因此,本文对新能源电力系统的小扰动稳定性进行了分析。论文的主要工作内容如下：(1)本文提出在供热管网上安装带有电锅炉和储热罐的热力站,通过热力站配合CHP机组运行,解耦CHP机组的“热电联耦”约束。同时,为了更好地控制和协调风电场、常规火电、CHP机组和热力站的优化运行,将它们组建成一个虚拟发电厂,通过虚拟发电厂的控制中心进行统一经济调度,并参与市场竞争,获取最大经济收益。(2)采用场景分析法表示风电不确定性并建立日前综合调度模型,模型以整个虚拟发电厂的经济收益最大化为目标,考虑了虚拟发电厂内各单元的特性、约束以及成本和收益。最后,利用算例验证了设置热力站的技术可行性以及虚拟发电厂的经济性。(3)为保证新能源电力系统的安全稳定性,本文研究了高比例新能源电源接入和特高压交直流电网建设两方面对系统的小扰动稳定性的影响。通过研究表明,配置热力站后能有效提升系统调峰能力,促进风电消纳,为我国缓解弃风现象提供了一种可行性方案。新能源电源对电网的小扰动稳定性影响不大,而特高压交直流互联电网接入电网后能对系统的小扰动稳定性有着显著的改善。
[Abstract]:Nowadays, with the rapid development of economy and society, the great pressure of fossil energy depletion and environmental deterioration is also accompanied. Facing the energy difficulties, new energy sources such as wind power have huge reserves. Low-carbon environmental protection and other huge advantages of rapid development. China is rich in wind energy, wind power industry is developing rapidly. However, there is a serious phenomenon of wind abandonment in the "three north" areas. This paper analyzes the causes of wind abandonment in the new energy power system. A thermal station with electric boiler and heat storage tank is installed on the node of the heating pipe network, which can be decoupled by the operation of the CHP unit. And then enhance the system peak-shaving capacity and promote the optimal operation of wind power consumption. At the same time, due to wind power and other new energy generation has intermittent, volatility and other characteristics. Will have a certain impact on the safety and stability of the power system. In this paper, the small disturbance stability of new energy power system is analyzed. The main work of this paper is as follows: 1) this paper puts forward the installation of thermal station with electric boiler and heat storage tank in the heating network. In order to better control and coordinate the wind farm, the conventional thermal power plant and the thermal station are optimized by the thermal power station cooperating with the CHP unit to decouple the "thermoelectric coupling" constraint of the CHP unit. They will be set up as a virtual power plant, through the virtual power plant control center for unified economic dispatch, and participate in market competition. Obtain the maximum economic benefit. 2) use the scenario analysis method to express the uncertainty of wind power and establish the pre-day comprehensive dispatching model. The model aims at maximizing the economic benefits of the whole virtual power plant. The characteristics, constraints, costs and benefits of each unit in the virtual power plant are considered. An example is used to verify the technical feasibility of setting up thermal power station and the economy of virtual power plant to ensure the safety and stability of new energy power system. In this paper, the influence of high proportion new energy supply access and UHV AC / DC power network construction on the stability of the system is studied. The results show that the peak shaving capability of the system can be effectively enhanced after the thermal power station is configured. Promoting wind power consumption provides a feasible scheme for alleviating the phenomenon of abandoned wind in China. The new energy supply has little effect on the small disturbance stability of power grid. The UHV AC / DC interconnection network can improve the stability of the system with small disturbance after it is connected to the power system.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM712;TM732

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