抽水蓄能电站水力机组过渡过程的仿真计算

发布时间：2018-06-16 17:38

本文选题：抽水蓄能电站 + 过渡过程　；参考：《昆明理工大学》2014年硕士论文

【摘要】：随着我国经济的不断发展,整个社会生产生活的用电规模越来越大,电力系统随之日渐复杂,电网安全日显重要,抽水蓄能电站在电网当中的作用已由开始的调峰填谷逐步的过渡成为电网的保安工具,在维系电网安全的同时,其自身的安全性必须得到保障,而抽水蓄能电站水力机组的过渡过程是威胁电站安全运行的主要因素,对抽水蓄能电站前期的设计施工和后期的运行进行过渡过程的计算是电站的主要问题之一,本文正是在这样的背景下进行的研究。本文以南方电网某抽水蓄能电站为例对其进行水力机组过渡过程的仿真计算,从理论到仿真进行了深入的研究。首先,概述了我国水电事业的发展,以及抽水蓄能电站的基本原理及其组成、工作特性、在电网中的作用以及国内外的发展趋势,同时介绍了过渡过程的原理；其次推导出计算水力机组过渡过程的运动方程和连续性方程,及其所采用计算方法—特征线法,并且对可逆式水泵水轮机进行了全特性曲线的处理。最后在已知电站的基本资料的情况下,利用Matlab/simulink软件对可逆式水泵水轮机组进行了五种常规工况、十一种特殊工况和二种叠加工况转化下模拟计算了球阀上游侧的最大压力,蜗壳末端的最大动水压力,尾水管的真空度以及机组转速上升最大值等大波动过渡过程,得出了计算结果和仿真图,并且给出了改善大波动过渡过程的一些措施。同时计算出了电站在发生小波动过渡过程和水力干扰时的最大出力、最小出力、最高涌浪水位和最低涌浪水位,可为同类型抽水蓄能电站的前期设计和后期运行提供参考。
[Abstract]:With the development of economy in our country, the scale of power consumption in the whole society is becoming larger and larger, the power system is becoming more and more complex, and the security of power grid is becoming more and more important. The role of pumped-storage power stations in the power network has gradually changed from peak shaving and valley filling into security tools for the power grid. While maintaining the security of the power grid, its own security must be guaranteed. The transient process of hydraulic unit in pumped storage power station is the main factor threatening the safe operation of the power station. The design and construction of the pumped storage power station in the early stage and the calculation of the transition process in the later operation are one of the main problems of the power station. This paper is in this context of the research. In this paper, a pumped-storage power station in Southern Power Grid is taken as an example to simulate the transient process of hydraulic unit. First of all, the development of hydropower industry in China, the basic principle and composition of pumped storage power station, its working characteristics, the function in power grid and the development trend at home and abroad are summarized. At the same time, the principle of transition process is introduced. Secondly, the equations of motion and continuity of the transient process of hydraulic units are derived, and the calculation method, the characteristic line method, is adopted, and the full characteristic curve of reversible pump turbine is treated. Finally, under the condition that the basic data of the power station is known, the maximum pressure on the upstream side of the ball valve is simulated and calculated by Matlab / Simulink software under five normal working conditions, eleven special working conditions and two superimposed working conditions by using Matlab / Simulink software. The maximum hydrodynamic pressure at the end of the volute, the vacuum degree of the draft tube and the maximum value of the increase in the unit speed are obtained. The calculation results and simulation diagrams are obtained, and some measures to improve the transition process of the large fluctuation are given. At the same time, the maximum output force, the minimum output force, the maximum surge water level and the lowest surge water level are calculated, which can provide a reference for the early design and later operation of the same type pumped storage power station.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV743;TV734

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