Impact of the Unbalanced Magnetic Pull on the Shafting Vibration of Hydro Turbine Generating Sets

2014 ◽  
Vol 644-650 ◽  
pp. 406-411
Author(s):  
Yan Yan Zeng ◽  
Yun Zeng ◽  
Zhe Wu ◽  
Shi Ge Yu
Keyword(s):  
Hydraulic Turbine ◽  
Good Method ◽  
Transient Model ◽  
Hydro Turbine ◽  
Unbalanced Magnetic Pull ◽  
Generating Sets ◽  
Governing System ◽  
Prony Algorithm ◽  
Actual Operation ◽  
Different Characteristics

The unbalanced magnetic pull (UMP) of hydro turbine generating sets (HTGS) is one of the main reason induced vibration of the HTGS and the power plant. To study the effects of UMP on the shaft vibration characteristics of HTGS, this article constructs whole HTGS system which include hydraulic turbine and its hydraulic system, generator, transient model of the HTGS shafting, excitation and governing system, to simulate the actual operation of HTGS. The shafting vibration is simulated under different characteristics of UMP, simulation shows that the frequency resonance zone of the UMP has large influence on the shafting vibration. And then, the improved Prony algorithm is applied to extract the shafting oscillation characteristics of HTGS, and is effective. It provides a good method to research the effect of frequency and amplitude changes of UMP on the shafting vibration.

Extraction Shafting Oscillation Characteristic of Hydro Turbine Generating Sets Based on Prony Algorithm

2014 ◽  
Vol 889-890 ◽  
pp. 563-568
Author(s):  
Zhe Wu ◽  
Yun Zeng ◽  
Yan Yan Zeng ◽  
Shi Ge Yu
Keyword(s):  
Optimization Design ◽  
Attenuation Factor ◽  
Vibration Signal ◽  
Simulation Method ◽  
Structure Design ◽  
Operating Conditions ◽  
Transient Model ◽  
Hydro Turbine ◽  
Generating Sets ◽  
Prony Algorithm

Hydro turbine generating sets vibration is an important factor affecting the safe operation of hydropower stations. The research on the vibration characteristics is basic for the unit structure design, control design and hydropower station powerhouse structure optimization design. Based on built transient model of the hydropower turbine generating sets shafting, this paper constructed the whole hydropower turbine generating sets operating system by combine the hydro turbine, the generator object model, the governor and the excitation controller. Using numerical simulation method to obtained the shafting vibration data under different operating conditions. And then used Prony algorithm to extract the oscillation characteristics of amplitude, frequency, attenuation factor and phase angle from the vibration signal of hydro turbine generating sets shafting parameters. The simulation results show that the proposed method is effective.

Shafting Vibration Simulation for Hydro Turbine Generating Sets

2013 ◽  
Vol 444-445 ◽  
pp. 1171-1176
Author(s):  
Yun Zeng ◽  
Li Xiang Zhang ◽  
Jing Qian ◽  
Cheng Li Zhang
Keyword(s):  
Vibration Amplitude ◽  
Angular Speed ◽  
Transient Model ◽  
Integrated Simulation ◽  
Hydro Turbine ◽  
Equivalent Damping ◽  
Generating Sets ◽  
Mass Eccentricity ◽  
Equivalent Damping Coefficient ◽  
Vibration Simulation

Based on the transient model of hydro turbine generating sets (HTGS), the integrated simulation system of HGTS is built to study shafting stability. Given different bearing stiffness, equivalent damping coefficient and mass eccentricity, the change characteristics of shafting vibration at rated angular speed in steady and maximum angular speed in transient are simulated, and which are applied to study inferences shafting parameters and angular speed on shafting vibration. Simulation results show that the relationship between shafting vibration amplitude and angular speed is linear. however, the vibration amplitude increment produced by angular speed error will be amplified while the shafting stiffness is weaker, mass eccentricity of the runner and rotor is larger.

Research of Simulation Model for Non-Linear Turbine Regulating System

2011 ◽  
Vol 354-355 ◽  
pp. 569-574 ◽  
Author(s):  
Mei Feng Sun ◽  
Rui Lian Wang ◽  
Jia Wang ◽  
Jing Bin Lu
Keyword(s):  
Mathematical Model ◽  
Simulation Model ◽  
Transition Process ◽  
Hydraulic Turbine ◽  
Large Fluctuation ◽  
Transfer Coefficients ◽  
Operating Condition ◽  
Hydro Turbine ◽  
Governing System ◽  
The Mathematical Model

In the large fluctuation transition process of hydropower unit, hydraulic turbine operating condition changes drastically, following the change, hydraulic-turbine transfer coefficients also change drastically, thus the mathematical model of hydro-turbine governing system is nonlinear. This paper establishes simulation model of large fluctuation transition process in SIMULINK software, puts forward a method of establishing simulation model of nonlinear hydro-turbine governing system.

scholarly journals Linear Modeling and Regulation Quality Analysis for Hydro-Turbine Governing System with an Open Tailrace Channel

Energies ◽  
2015 ◽  
Vol 8 (10) ◽  
pp. 11702-11717 ◽  
Author(s):  
Jiandong Yang ◽  
Mingjiang Wang ◽  
Chao Wang ◽  
Wencheng Guo
Keyword(s):  
Quality Analysis ◽  
Linear Modeling ◽  
Hydro Turbine ◽  
Governing System

Stability analysis of a hydro-turbine governing system considering inner energy losses

2019 ◽  
Vol 134 ◽  
pp. 258-266 ◽  
Author(s):  
Beibei Xu ◽  
Hong-Bae Jun ◽  
Diyi Chen ◽  
Huanhuan Li ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Energy Losses ◽  
Hydro Turbine ◽  
Governing System

Investigations Of Pressure Pulsations In A Model Of Draft Tube Of Hydraulic Turbine Caused By Vortex Rings

2016 ◽  
Vol 11 (4) ◽  
pp. 25-32
Author(s):  
Sergey Skripkin ◽  
Mikhail Tsoy ◽  
Sergey Shtork ◽  
Pavel Kuibin
Keyword(s):  
Vortex Ring ◽  
High Speed ◽  
Draft Tube ◽  
Hydraulic Turbine ◽  
Vortex Rings ◽  
Experimental Investigations ◽  
Visualization Technique ◽  
Vortex Rope ◽  
Hydro Turbine ◽  
Hydraulic Turbines

Current work is devoted to experimental investigations of behavior of precessing vortex rope in a draft tube model of hydraulic turbine. We used combination of stationary and freely rotating swirlers as a hydro turbine model. Such construction provides velocity distribution on the draft tube inlet close to distribution in natural hydraulic turbines operated at non-optimal conditions. The phenomenon of precessing vortex rope reconnection with further formation of vortex ring was founded in this experimental research using high-speed visualization technique. Synchronization of highspeed visualization and pressure measurements allowed us to relate pressure shock on the draft tube wall with vortex ring moving along wall.

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