Improvement Rotor Angle Oscillation of Hydro Turbine Generating Sets Based on Hamiltonian Damping Injecting Method

2010 ◽  
Author(s):  
Yun Zeng ◽  
Lixiang Zhang ◽  
Tianmao Xu ◽  
Hongkui Dong
Keyword(s):  
Hydro Turbine ◽  
Generating Sets ◽  
Rotor Angle

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.

scholarly journals The generalized Hamiltonian model for the shafting transient analysis of the hydro turbine generating sets

2014 ◽  
Vol 76 (4) ◽  
pp. 1921-1933 ◽  
Author(s):  
Yun Zeng ◽  
Lixiang Zhang ◽  
Yakun Guo ◽  
Jing Qian ◽  
Chenli Zhang
Keyword(s):  
Transient Analysis ◽  
Hydro Turbine ◽  
Generating Sets ◽  
Hamiltonian Model

Stabilization and L2 Disturbance Control Based on Generalized Hamiltonian Model of Hydro Turbine Generating Sets

2012 ◽  
Vol 212-213 ◽  
pp. 1228-1232
Author(s):  
Yun Zeng ◽  
Li Xiang Zhang ◽  
Jing Qian ◽  
Cheng Li Zhang ◽  
Yu Wang
Keyword(s):  
Equilibrium Point ◽  
Complex Structure ◽  
Control Model ◽  
Disturbance Attenuation ◽  
Hydro Turbine ◽  
Generating Sets ◽  
Stabilization Control ◽  
Additional Control ◽  
Hamiltonian Model ◽  
Simulation Results

The hydro turbine generating sets model exists uncertainty in structure and parameters due to its complex structure and operating states multiformity. Especially, the adaptability and robustness of controller is more important for the stabilization control at equilibrium point under given output. Based on Hamiltonian control model of nonlinear hydro turbine generating sets, the L2 disturbance attenuation control is added into the stabilization control to restrain disturbance from model and structure parameters in this paper. The L2 additional control is proved to be asymptotic stability, and its control low is derived. Simulation results show that adding L2 additional control, system can stable to given equilibrium point and has more adaptability and robustness.

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.

Main problems of import subsumption in domestic engineering, applicable to small-power electric generator installations

2018 ◽  
Vol 1 (1) ◽  
pp. 46-51 ◽  
Author(s):  
A. V. Shelgunov
Keyword(s):  
Low Power ◽  
Import Substitution ◽  
Power Generator ◽  
Small Power ◽  
Domestic Production ◽  
Power Generators ◽  
Electric Generator ◽  
Generating Sets ◽  
Current State ◽  
Generator Sets

Subject: the subject of the study are low-power generator sets with a power of up to 30 kW.Materials and methods: in this paper, the main domestic legislative documents regulating the requirements for products. An assessment is made of the current state of Russian engine building.Results: the detailed analysis of the modern domestic market of power generating units with a capacity of up to 30 kW is made, the main problems in the field of domestic production of  electric power generators in the range up to 30 kW are revealed, and the prospects for import substitution of gasoline and diesel engines are noted.Conclusions: almost complete absence of the market of domestic low-power generating sets is established, insufficient measures taken to support domestic producers are noted, measures are  proposed for the development of domestic production of power units in the range of up to 30 kW.

Generating the Mapping Class Group

2017 ◽  
Author(s):  
Benson Farb ◽  
Dan Margalit
Keyword(s):  
Exact Sequence ◽  
Simplicial Complex ◽  
Mapping Class Group ◽  
Class Group ◽  
Mapping Class ◽  
Detailed Structure ◽  
Inductive Step ◽  
Closed Curves ◽  
Combinatorial Object ◽  
Generating Sets

This chapter considers the Dehn–Lickorish theorem, which states that when g is greater than or equal to 0, the mapping class group Mod(Sɡ) is generated by finitely many Dehn twists about nonseparating simple closed curves. The theorem is proved by induction on genus, and the Birman exact sequence is introduced as the key step for the induction. The key to the inductive step is to prove that the complex of curves C(Sɡ) is connected when g is greater than or equal to 2. The simplicial complex C(Sɡ) is a useful combinatorial object that encodes intersection patterns of simple closed curves in Sɡ. More detailed structure of C(Sɡ) is then used to find various explicit generating sets for Mod(Sɡ), including those due to Lickorish and to Humphries.

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