发电厂GCB配置方案设计与优选研究

发布时间：2018-02-06 00:33

本文关键词： 火力发电厂电气主接线发电机出口断路器设计　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：提高发电机组运行可靠性、降低发电成本是发电企业两项重要的经济指标。为了使新建电厂达到全寿命周期内效益最大化,电厂投资方经常邀请多家电力设计院对同一项目提出不同的设计方案,并开展充分论证,这不仅包括电厂建设的初期投资,同时也涵盖了电厂投产以后的运行维护费用。作为发电厂重要设备之一,电气主接线系统的设计越来越被重视。600MW及以上大容量机组因其单机容量大,负荷就地供需平衡困难,发电厂在厂内一般仅有500k V一个电压等级向区域负荷中心供电。随着环保标准的提高,新建火力发电厂选址进一步远离城市中心,远离周边220k V变电站,如果不改进设计思路,继续沿用过去的典型设计方案从外部220k V变电站引接启动/备用电源,一方面,在经济发达、人口稠密的地区,征地拆迁难度大、征地补偿费用高,导致发电厂出线线路基建投资比较高;另一方面,厂网分开后,从电网引接启动/备用电源时,电网公司一般按大工业用户对待,每年向发电厂收取昂贵的基本容量电费。若配置发电机出口断路器(以下简称GCB),优化厂用电一次系统接线方案,不仅能避开上述问题,还能极大地为发电厂节约运行费用。为此,在发电厂开展GCB配置方案设计与优化研究非常必要。本文以新建大型火力发电厂为研究对象,分七个章节,第一章分析了选题背景、GCB研究现状和本文的研究思路;第二章对项目管理、项目风险、项目费用等进行理论阐述,并分析了文中方案设计的要求、原则和方法;第三章从安全和技术上分析GCB对大型发电厂电源可靠性的影响,指出配置GCB的必要性;第四章提出了大型火力发电厂六种典型GCB配置方案;第五章是针对六种典型设计方案开展综合性能比选研究,得出优选设计方案;第六章结合现场案例,对优选设计方案六开展应用案例论证与分析,证实了该方案的实用性;第七章是本文的结论。通过研究,归纳出大型火力发电厂GCB配置的一般原则,并根据各区域备用电源的不同收费规定得出方案六是本文最优设计方案,可为新建大型发电项目工程GCB配置和电气主接线设计提供参考。
[Abstract]:To improve the operating reliability of generating units and reduce the generation cost are two important economic indicators of power generation enterprises in order to maximize the benefits of the new power plants during their life cycle. Power plant investors often invite many electric power design institutes to put forward different design plans for the same project, and carry out full demonstration, which not only includes the initial investment of power plant construction. As one of the important equipments in power plant, the design of electrical main wiring system is paid more and more attention to because of its large capacity of single unit. It is difficult to balance the supply and demand of the local load. Generally, the power plant only has a voltage level of 500kV in the plant to supply power to the regional load center. With the improvement of environmental protection standards. The new thermal power plant site is further away from the city center, away from the peripheral 220 kV substation, if not improve the design ideas. Continue to use the past typical design from the external 220kV substation start / backup power supply, on the one hand, in the economically developed, densely populated areas, land acquisition and removal is difficult, land acquisition and compensation costs are high. As a result, the investment of power plant line infrastructure is relatively high; On the other hand, after the separation of the power plant and grid, the power grid companies generally treat the large industrial users when they are connected to the starting / standby power supply from the power grid. The electricity charge of basic capacity is charged to the power plant every year. If the generator outlet circuit breaker (hereinafter referred to as GCBN) is configured, the system wiring scheme of one time system can not only avoid the above problems. For this reason, it is necessary to develop GCB configuration scheme design and optimization research in power plant. This paper takes the new large thermal power plant as the research object, divides into seven chapters. The first chapter analyzes the background of GCB research and the research ideas of this paper; The second chapter describes the project management, project risk, project cost and so on, and analyzes the requirements, principles and methods of the project design. The third chapter analyzes the influence of GCB on the power supply reliability of large power plant from safety and technology, and points out the necessity of GCB configuration. In Chapter 4th, six typical GCB configuration schemes for large thermal power plants are proposed. Chapter 5th is aimed at six typical design schemes to carry out comprehensive performance comparison and selection research to obtain the optimal design scheme; Chapter 6th, combined with field cases, demonstrates and analyzes the application cases of the selected design scheme 6, which proves the practicability of the scheme. Chapter 7th is the conclusion of this paper. Through the research, the general principles of GCB configuration in large thermal power plants are summarized, and the scheme 6 is the optimal design scheme of this paper according to the different charge regulations of reserve power supply in various regions. It can provide reference for GCB configuration and main wiring design of new large-scale power generation project.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM621

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