带调压井水轮机微分代数模型建模与分析

发布时间：2018-05-11 00:26

本文选题：水力动态 + 调压井　；参考：《昆明理工大学》2017年硕士论文

【摘要】：水力机组过渡过程的研究对水电站的安全稳定运行有十分重要的意义。建立完整的水、机、电模型是对水电站过渡过程进行仿真研究的基础,完整的仿真模型应该包含系统各部分的详细模型。以往由于研究重点的不同所建立的模型通常仅结合研究目的对局部子系统进行细化。鉴于此,本人在前人研究的基础上,建立了相对完整的水轮发电机组控制系统模型。主要内容包括以下几个方面:(1)在水轮机暂态模型中,调压井的水力动态通常作为一个附加输入项或独立变量,为了消除调压井独立变量,减少未知量个数,本文将调压井动态归并到管道末端的水力动态,建立了计及调压井动态的水力系统动态模型。并与传统方法建立的水力系统动态模型进行仿真对比,验证了所建立模型满足研究水轮机暂态特性的需要。(2)建立了完整的水轮发电机组控制系统模型,包括PID调速器模型,PI励磁控制器模型和三阶发电机模型。讨论了在仿真研究水轮发电机组动态特性时,不同水力系统模型对机组调节品质的影响。通过仿真表明,机组暂态过程受水力系统模型详细程度影响,采用弹性水击模型能详细反映系统动态。(3)选取不同的控制系统参数,基于所建立的水轮发电机组控制系统模型,仿真研究了控制系统参数对有调压井的水轮发电机组调节品质的影响。通过仿真表明,控制系统参数对机组暂态调节过程有影响,在调压井水位波动阶段,控制系统参数对机组调节影响较小。(4)对有调压井水电站过渡过程的影响因素进行了分析,包括水流惯性时间、调压井面积、引水管道粗糙程度和负荷扰动程度。仿真表明,水流惯性时间影响暂态过程,调压井面积和引水管道粗糙程度对调压井水位波动阶段有影响,负荷扰动程度对暂态和调压井水位波动阶段的动态品质都有影响。
[Abstract]:The research on the transient process of hydraulic unit is very important for the safe and stable operation of hydropower station. To establish a complete model of water, machine and electricity is the basis of the simulation research on the transition process of hydropower station. The complete simulation model should include the detailed model of each part of the system. In the past, the local subsystems were refined by the models based on different research emphases. In view of this, on the basis of previous research, I have established a relatively complete control system model of hydrogenerator set. The main contents include the following aspects: (1) in the transient model of hydraulic turbine, the hydraulic performance of the surge well is usually regarded as an additional input or independent variable, in order to eliminate the independent variable of the surge well and reduce the number of unknown variables, In this paper, a dynamic model of hydraulic system is established, in which the hydraulic performance of the regulating well is merged into the hydraulic performance at the end of the pipeline. Compared with the hydraulic system dynamic model established by the traditional method, it is verified that the established model meets the needs of studying the transient characteristics of the turbine.) the complete control system model of the turbine generator set is established. It includes PID governor model, Pi excitation controller model and third order generator model. In this paper, the influence of different hydraulic system models on the unit regulation quality is discussed when the dynamic characteristics of the turbine generator are studied by simulation. The simulation results show that the transient process of the unit is affected by the detail degree of the hydraulic system model, and the elastic water hammer model can reflect the system dynamics in detail. (3) different control system parameters are selected, based on the established control system model of the hydrogenerator set. The effect of control system parameters on regulating quality of hydraulic turbine generator set with surge well is studied by simulation. The simulation results show that the control system parameters have an effect on the transient regulation process of the unit, and at the stage of water level fluctuation in the surge well, the control system parameters have little effect on the unit regulation. (4) the factors affecting the transient process of the hydropower station with the surge well are analyzed. Including flow inertia time, pressure well area, diversion pipe roughness and load disturbance. The simulation results show that the inertial time of the flow affects the transient process, the area of the surge well and the roughness of the diversion pipe affect the water level fluctuation stage, and the load disturbance degree has an effect on the transient state and the dynamic quality of the water level fluctuation stage.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV734.1

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