A Simulation Modeling Method and Model of Hydraulic Turbine Regulation System in Tunnel with Variable Roof and High Tailwater

Abstract

Provided are a method for simulation modeling of a variable crown elevation tailwater tunnel water turbine regulating system and a model. The method comprises a step 1) of establishing a water turbine speed regulator mathematical model which comprises a water turbine speed regulator, namely a proportion integration differentiation (PID) regulator model, and an electrical-hydraulic servo system model; a step 2) of establishing a water turbine mathematical model; a step 3) of establishing a water conveyance system mathematical model, which concretely comprises the steps of performing segment handling on a water conveyance system, taking a water turbine as the boundary to divide the whole water conveyance system into a pressurized water conveyance system and a variable crown elevation tailwater system; respectively performing pressurized water conveyance system modeling and variable crown elevation tailwater system modeling; and obtaining a mathematical model of a whole water conveyance system according to the two mathematical models; and a step 4) of obtaining a simulation model of the whole variable crown elevation tailwater tunnel water turbine regulating system by combination with the water turbine speed regulator mathematical model established in the step 1), the water turbine mathematical model established in the step 2) and the water conveyance system mathematical model established in the step 3). The model established according to the method is small in calculated amount, the accuracy is high, and the stability is good.

Description

technical field [0001] The invention relates to hydraulics of a hydropower station and simulation of a water turbine regulation system, in particular to a simulation method and a model of a water turbine regulation system of a tailwater tunnel with a variable ceiling height. Background technique [0002] The tailrace tunnel with variable roof height is a brand-new design concept proposed by my country in the design of hydropower by referring to the design ideas of the former Soviet Union. For large-scale hydropower stations with long water system and low water head, replacing the tailwater surge chamber based on the requirements of turbine regulation guarantee can not only greatly reduce the project investment, but also have the advantages of convenient construction and stable cavern structure. Currently, the Three Gorges, Xiangyang Some large-scale hydropower stations such as Jiaba, Pengshui, and Baise have adopted the structure of variable roof and high tailwater tunnels. ...

AI Technical Summary

Problems solved by technology

For conventional hydroelectric units, there are linearized models for time-domain simulation and frequency-domain analysis of the small fluctuation transition process of the turbine regulation system, and have been widely used in the simulation of power systems. The hydraulic characteristics of the tailrace tunnel with variable ceiling height have a significant impact on the adjustment process. At present, there is no more accurate linear model of the hydraulic characteristics of the tailrace tunnel with variable ceiling height. domain analysis

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