大型火电厂接入特高压电网电气主接线方案研究

发布时间：2018-03-08 19:04

本文选题：火电厂　切入点：特高压电网　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】：近些年来,随着国家经济建设的飞速增长,我国特高压电网发展速度不断加快。为响应国家煤电一体化,走能源综合发展和可持续发展道路,各大发电公司火电厂都在积极研究接入特高压电网的技术。从减少升压环节、降低线路阻抗、节约工程及土地投资方面,发挥特高压技术优势。构建强有力的特高压电网,对于加快我国能源基地资源的优化配置及集约化开发具有十分重要的现实意义,同时符合国家能源发展战略,形成煤电循环经济产业链条,大规模地实现煤碳就地转化,实现能源综合利用。形成我国西部地区大型煤电一体化基地,能够保证能源的安全、节约利用,达到煤、电之间的效益平衡,是集经济效益、社会效益、生态效益于一体的工程。本论文通过对国内外特高压接入电网技术应用情况的研究,从综合安全性、经济性和可靠性三个指标来衡量了采用特高压输电的优势,并对国内外发电厂的电气主接线及变电站设计实践经验对比分析,强调在特高压等级的变电站中,应优选安全可靠、运行操作有把握的主接线方式。通过对内蒙古电网和锡林郭勒盟多伦县特高压变电站及胜利电厂接入特高压站的必要性进行了分析。在选择接入系统电压等级时,特别是考虑电厂的规模、容量、输电距离,认为该工程将对满足京津唐电网负荷增长的需要,提高供电可靠性和电能质量有着积极作用。本论文通过对大电源基地火电厂接入特高压电网的几种可选方案进行计算、分析、论证,结合输电距离、送电容量、可靠性、技术经济性、稳定性等方面内容,对一次升压、二次升压方式的忧劣性进行了对比,并结合原始资料的分析,提出了电厂升压方案。同时对相应方案进行了可靠性、灵活性、经济性分析及讨论,确定了合理方案,为该火电厂接入特高压电网的电气主接线方案设计提供技术参考。
[Abstract]:In recent years, with the rapid growth of national economic construction, the development of UHV power grid in China has been accelerating. In response to the integration of national coal and electricity, we have taken the road of comprehensive energy development and sustainable development. All the major power plants are actively studying the technology of connecting to the UHV power grid. In terms of reducing boost links, reducing line impedance, saving engineering and land investment, UHV technical advantages are brought into play, and a powerful UHV power grid is constructed. It is of great practical significance to accelerate the optimal allocation and intensive exploitation of energy base resources in China. At the same time, it accords with the national energy development strategy, forms the industrial chain of coal and electricity recycling economy, and realizes the local conversion of coal on a large scale. To realize the comprehensive utilization of energy and to form a large coal-power integration base in the western region of China can ensure the safety of energy, economize the utilization of energy, achieve a balance of benefits between coal and electricity, and it is a combination of economic and social benefits. Based on the research on the application of UHV access technology at home and abroad, this paper measures the advantages of UHV transmission from the three indexes of comprehensive security, economy and reliability. By comparing and analyzing the practical experience of electric main wiring and substation design in domestic and foreign power plants, it is emphasized that the optimal selection should be safe and reliable in the UHV grade substation. Through the analysis of the necessity of connecting UHV substation and Shengli Power Plant to UHV station in Inner Mongolia Power Grid and Xilinguolermeng County and Shengli Power Plant, when selecting the voltage grade of access system, In particular, considering the scale, capacity and transmission distance of the power plant, it is considered that the project will meet the needs of the load growth of the Beijing-Tianjin-Tangshan power network. Improving the reliability and quality of power supply plays a positive role. This paper calculates, analyzes, demonstrates, combines transmission distance, transmission capacity, reliability of several alternative schemes for connecting power plants to UHV power networks based on large power supply bases. In terms of technical economy and stability, this paper compares the worrisome characteristics of primary boost and secondary boost, and puts forward a power plant boost scheme combining with the analysis of original data. At the same time, the reliability and flexibility of the corresponding scheme are given. Economic analysis and discussion, a reasonable scheme is determined, which provides a technical reference for the design of the main electrical connection scheme of the thermal power plant connected to the UHV power network.
【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】：TM621

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