水泵水轮机不同工况点的稳定性分析  

Operation stability analysis of pump-turbine in different working conditions

作　　者：唐韧博 杨建东[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《水力发电学报》2016年第5期117-122,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51039005)

摘　　要：为研究水泵水轮机特性曲线与抽水蓄能机组运行稳定性的关系,本文建立了调速器、引水系统、水轮机、发电机的传递函数,并在此基础上运用经典控制理论进行分析,找出了决定抽水蓄能机组稳定性的综合参数。选取了国内19套实际运行机组的特性曲线,利用多项式拟合的数学方法,拟合了单位流量、单位力矩随开度、单位转速的变化规律表达式;通过拟合的表达式,计算了水轮机的六个传递系数,继而求出了综合参数在工作区内的变化规律,得出了不同水头下,机组特性对系统稳定性的影响,并将求得的传递系数值代入数值仿真计算,验证了结论的正确性。In this article, a control model composed of a turbine governor, penstock, pump-turbine, and generator, is developed to study the influence of pump-turbine characteristics on system stability. Classical control theory was applied to derive expressions for the synthetic coefficients. Based on the real pumpturbine characteristics of 19 sets collected from model tests, polynomial surfaces were fitted for the relationships of unit flow and unit torque versus unit speed and guide-vane opening. Combining these relationships with the expressions of synthetic coefficients, we can reveal the trends of variations in the six transfer coefficients and the synthetic coefficient and thus obtain the influence of pump-turbine characteristics on system stability at different water heads. Finally, numerical simulations of several working conditions were conducted, which validates our conclusions.

关 键 词：抽水蓄能机组 水轮机调节系统 水泵水轮机特性曲线 运行稳定性 

分 类 号：TV734.1[水利工程—水利水电工程] TV743