Simulation model of radial vibration for a large hydro-turbine generator unit and its application

2011 ◽  
Author(s):  
Yong Xu ◽  
Zhaohui Li ◽  
Xide Lai
Keyword(s):  
Simulation Model ◽  
Radial Vibration ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Generator Unit

Computational Model for Investigating the Influence of Unbalanced Magnetic Pull on the Radial Vibration of Large Hydro-Turbine Generators

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Yong Xu ◽  
Zhaohui Li
Keyword(s):  
Computational Model ◽  
Analytical Method ◽  
Analytical Methods ◽  
Electrical Machine ◽  
Radial Vibration ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Unbalanced Magnetic Pull ◽  
Turbine Generators ◽  
Rotor Model

A radial unbalanced magnetic pull (UMP) can be produced by an eccentric rotor and leads vibrations in large hydro-turbine generators. The influence of nonlinear UMP on the radial vibration of a large hydro-turbine generator is analyzed in this paper. The UMP is determined as a function of eccentricities and field currents by means of a simple analytical method instead of the finite element (FE) method. The analytical method employs the no-load characteristic curve of an electrical machine and saturation effects of the ferromagnetic materials are taken into consideration. FE rotor model of a large hydro-turbine generator unit, taking account of guide bearings, thrust bearing and periodic forces, is developed to investigate the influence of UMP on radial vibrations. The FE rotor model and the analytical method for UMP constitute the computational model. UMP is calculated under different rotor eccentricities and field currents by the proposed method. Comparing with other analytical methods, the effectiveness of the proposed method is verified. Dynamic responses of the FE model under different analytical methods for UMP are calculated to investigate the difference in vibration between different analytical methods. A simulated excitation test is performed and a comparative analysis between the calculated results and the field data is provided. The computational model is proved to be reasonable according to the analysis.

Dynamic analysis and modeling of a novel fractional-order hydro-turbine-generator unit

2015 ◽  
Vol 81 (3) ◽  
pp. 1263-1274 ◽  
Author(s):  
Beibei Xu ◽  
Diyi Chen ◽  
Hao Zhang ◽  
Rui Zhou
Keyword(s):  
Dynamic Analysis ◽  
Fractional Order ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Generator Unit

scholarly journals Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

2021 ◽  
Author(s):  
Yousong Shi ◽  
Jianzhong Zhou
Keyword(s):  
Mathematical Model ◽  
Optimal Control ◽  
Stable Operation ◽  
Control Parameters ◽  
Optimization Strategy ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Multi Objective ◽  
Nonlinear Dynamic Characteristics ◽  
Generator Unit

Abstract The hydro-turbine governing system (HTGS) and shafting system are mutually coupled. However, the interaction between them has always been neglected. This paper aims to explore the stability and sensitivity of the governor control parameters to the HTGS and shafting system and make the optimal control of the stable operation for the hydro-turbine generator unit(HTGU). First, a novel HTGU motion equation is proposed, which can make connections between the HTGS and the shafting system of the HTGU. And on this basis, the nonlinear coupling mathematical model of the HTGS and the shafting system is established. According to the nonlinear mathematical model, the sensitivity of the governor control parameters on the operating stability of the HTGU is obtained. Then, a multi-objective governor control parameters optimization strategy is proposed. Furthermore, the chaotic-dominated sorting genetic algorithm II(NSGA-II) and multi-objective evolutionary algorithm based on decomposition(MOEAD) were introduced to obtain the optimal control parameter and mutually verify the effectiveness of the optimization effect. Finally, the nonlinear dynamic characteristics of HTGU under optimal control were revealed. The simulation results show that the rotation speed deviation and shafting system vibrations are sensitive on the PID parameters in some ranges and the stable region will be decreased when considering the shafting system vibrations. The multi-objective PID parameter optimization strategy shows good control performance on the nonlinear dynamic characteristics of the HTGU. The shafting system vibrations excited by the coupled vibration sources are quasi-period in 3D space. In addition to this, these results and the optimization strategy can provide some bases for the design and stable operation of the HTGU.

The Minimum Circumscribed Circle Based Method for Hydro-Turbine Generator Unit Bearing Clearance Adjustment Analysis

2012 ◽  
Vol 630 ◽  
pp. 193-202
Author(s):  
Can Xun Du ◽  
Wei Hua Gui ◽  
Zhi Kun Hu ◽  
Chun Bo Liu
Keyword(s):  
High Temperature ◽  
Traditional Method ◽  
Concentric Circle ◽  
New Method ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Bearing Clearance ◽  
Generator Unit ◽  
Centre Of Rotation ◽  
Turning Test

Hydro-turbine generator unit turning test is a key step to check the installation quality of the shafting system. The unit turning data is very important for bearing clearance adjustment. The traditional unit turning test and bearing clearance adjustment are based on a condition of that the spindle turning orbit is an approximate circle. It is simple to be used in the field operation and applicable to the most units. The trajectory of the turning orbit shows irregular shape when the spindle has a certain part of the flaw. If the traditional method is used for the unit turning and adjusting the bearing clearance, this may cause the eccentricity of three guide bearing bushes and uneven of the bearing clearance. The unit may appear a high temperature or large swing phenomenon after its commission. Seriously the unit may be burned and permanent damage. To solve this problem, this paper proposed a new method to calculate a minimum rotation space of the shaft in the bearing for each guide bearing clearance according to a geometric algorithm. Using the new method, according to the minimum circumscribed circle of the turning axis locus and final position of the turning spindle after unit turning, the bearing clearances corresponding to each turning number on the shaft can be calculated precisely. And then the bearing radial position is distributed properly so that the bearing is in the centre of rotation to the centre of the concentric circle. Therefore, the specific value of each bearing clearance adjustment is obtained. Site testing results show that using the new method the high temperature and large adjustment gap caused by using the traditional method can be avoided. Thus, the hydro-turbine generator unit operating stability is improved.

scholarly journals Grid‐connection analysis of hydro‐turbine generator unit with stochastic disturbance

2019 ◽  
Vol 13 (3) ◽  
pp. 500-509 ◽  
Author(s):  
Jing Liu ◽  
Beibei Xu ◽  
Diyi Chen ◽  
Jianling Li ◽  
Xiang Gao ◽  
...  
Keyword(s):  
Turbine Generator ◽  
Stochastic Disturbance ◽  
Hydro Turbine ◽  
Grid Connection ◽  
Generator Unit
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