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Simulation method for water turbine generator set shafting vibration transient state

A vibration technology for generating sets and shafting, which is applied in the fields of electrical digital data processing, information technology support systems, and special data processing applications, etc. It can solve the problems that the influence of additional force on the basic model of the shafting and the mechanism of action cannot be given.

Inactive Publication Date: 2014-02-26
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, this differential equation model cannot give the influence and mechanism of the additional force on the basic model of the shaft system, and these models are usually only used in the study of the steady state of the hydraulic unit, and cannot be used for the transient process of the control and adjustment of the unit analyze

Method used

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  • Simulation method for water turbine generator set shafting vibration transient state
  • Simulation method for water turbine generator set shafting vibration transient state
  • Simulation method for water turbine generator set shafting vibration transient state

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Embodiment approach 1

[0067] Implementation mode 1: Take the actual hydroelectric generator set of a power station as an example. Generator rated capacity S gB =150MW, rated speed is 125r / min, main parameters of shafting: m 1 =7.32×10 5 kg, m 2 =2.4×10 5 kg, R 1 =4.646m, R 2 =1.708m, J 1 =7.9×10 6 N·m 2 , J 2 =3.5×10 5 N·m 2 , p p =24, ω mB = 13.09rad / s, k 1 =0.2×10 9 N / m, k 2 =0.2×10 9 N / m, k 3 =0.35×10 9 N / m, c 1 =0.35×10 7 N·s / m, c 2 =0.25×10 7 N·s / m, geometric size: a =4m, b =3m, c =1.2m, e 1 =1.0mm, e 2 =0.5mm.

[0068] (1) Establish a vibration model of the shafting of a hydro-generator set, and use the external force acting on the shafting as an additional input control item to increase versatility.

[0069] Simplify the turbine generator set to figure 1 The form of establishing the first-order differential equation of shafting vibration is as follows.

[0070]

[0071]

[0072]

[0073]

[0074] Angular acceleration is retained in the model Item to reflect the influence of angular velocity...

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Abstract

The invention relates to a simulation method for a water turbine generator set shafting vibration transient state and belongs to the water turbine generator set stability analysis and control field. The simulation method for the water turbine generator set shafting vibration transient state comprises enabling the external force which acts on a shifting to be served as an additional input control item to increase universality and obtaining an angular acceleration item which is reserved in a model and can reflect angular velocity variation during the transient process; introducing other subsystem models into a shifting vibration model through water turbine torque and electric generator torque items in a set motion equation and achieving connection between the shafting vibration model and other subsystem models in the set; converting the shifting model into a first order differential equation sets to be combined with the set motion equation, forming into a shafting transient vibration calculation equation set and achieving the simulation. The simulation method for the water turbine generator set shafting vibration transient state aims at researching the vibration performance of the set under various transient state disturbances, particularly under a large disturbance and providing research methods and means for designing and controlling of safety and stability of the set shafting.

Description

technical field [0001] The invention relates to a method for simulating the transient state of vibration of a shaft system of a hydroelectric generator set, in particular to analyzing the transient state of vibration of a shaft system in the analysis of unit stability and controller design, and belongs to the field of stability analysis and control of a hydroelectric generator set. Background technique [0002] In the theoretical modeling of the vibration of the shafting of a hydraulic unit, the generator rotor, bearings, and turbine runner units are usually simplified into equivalent elements along the main axis to construct a physical model of the basic structure of the shafting. The centroid coordinates of the generator rotor and the turbine runner are used to establish two sets of motion differential equations for the generator rotor and the turbine rotor respectively, and the support function of the bearing is decomposed into these two sets of equations to form the basic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 曾云张立翔钱晶于凤荣张成立李泽王文全闫妍
Owner KUNMING UNIV OF SCI & TECH
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