考虑阀门管理函数的汽轮机调速系统稳定性分析  

Stability analysis for turbine speed control system considering valve management function

作　　者：李冰天 王强 张军科 张军辉 葛挺 LI Bingtian;WANG Qiang;ZHANG Junke;ZHANG Junhui;GE Ting(Datang Cental-China Electric Power Test Research Institute,Zhengzhou 450000,China)

机构地区：[1]大唐华中电力试验研究院,河南郑州450000

出　　处：《热力发电》2021年第2期150-156,共7页Thermal Power Generation

摘　　要：阀门管理函数是调速系统的关键环节,但现用的汽轮机调速系统模型并没有考虑其影响。对此,本文通过分析阀门流量特性,建立了含阀门管理函数的调速系统Simulink仿真模型,同时引入了线性因子β用来衡量阀门管理函数的线性程度。通过仿真和计算分析,得出调速系统处于开环控制和数字电液控制系统(DEH)闭环控制方式下的阻尼特性,并进一步了分析了2种控制方式下β、PI控制参数KP和KI、油动机时间常数Tydj和高压缸前汽室容积时间常数TCH对系统阻尼特性的影响。通过传递函数计算得到了DEH闭环控制时系统稳定性判断条件和β与KP、KI、Tydj和TCH的函数关系,并给出了β的负阻尼临界值和过阻尼临界值的计算方法,这可作为部分机组出现调速系统摆动时的分析依据。Valve management function is the key link of speed control system. However, the current model of turbine speed control system does not consider the influence of valve management function. Thus, through analyzing the flow characteristics of valve, this paper establishes the Simulink simulation model of speed control system with valve management function, and introduces the linear factor β to measure the linear degree of valve management function. Through simulation and calculation analysis, the damping characteristics of the speed control system under the open-loop control and closed-loop control are obtained, and the influences of the linear factor β, PI control parameters KP, KI, time constant Tydj of the hydraulic servo motor and volume time constant TCH of the high cylinder front steam chamber on the damping characteristics of the system are further analyzed. Through the transfer function calculation, the system stability judgment condition and the function relationship between β and KP, KI, Tydj and TCH are obtained, and the calculation method of β’s negative damping critical value and over damping critical value are given, which can be used as the analysis basis for some units when the speed governing system swings.

关 键 词：阀门管理函数 汽轮机 调速系统模型 线性因子β 阻尼特性 稳定性分析 

分 类 号：TM621.6[电气工程—电力系统及自动化]