带引水调压室水轮机调节系统稳定性及动态品质研究

为了研究小波动过渡过程中,调压室水位波动对水力发电系统动态稳定性及调节品质的影响,从水力耦合的角度,确定了调压室水位与机组流量之间的函数关系,建立了带引水调压室的水力发电系统数学模型,并基于Simulink对系统进行仿真研究。结果表明,调压室水位波动对机组转速的主波影响较小,对机组转速的尾波影响显著;调压室时间常数及引水系统的水力阻尼是影响调压室水位波动稳定的重要因素,机组转速的主波稳定不能表明系统稳定,还必须考虑调压室水位波动稳定性。

Study on Stability and Dynamic Quality of Hydraulic Turbine Governing System with Water Diversion Surge Chamber

In order to study on the impact of water level fluctuation on the stability and dynamic quality of hydraulic generation system during small wave transition, this paper builds a function relationship between water level of surge chamber and flow rate of unit on the basis of hydraulic coupling. A mathematical model of a hydropower system is established with the function relationship. The simulation of system is carried out on the Simulink platform. The results show that the fluctuation of water level in surge chamber has little impact on the main wave of unit rotational speed and has a significant impact on the tail race of unit rotational speed. The time constant of the surge chamber and the hydraulic damping of the water diversion system are the important factors that affect the stability of the water level fluctuation in the surge chamber. The main wave stability of the unit rotational speed cannot indicate the stability of the system. The stability of water level fluctuation in surge chamber must be considered when studying the stability of the system.