Analysis of Turbines Vibration and Treatment Measures during the Commissioning

2012 ◽  
Vol 591-593 ◽  
pp. 2087-2090
Author(s):  
Guo Cheng Fang
Keyword(s):  
Steam Turbine ◽  
Vibration Analysis ◽  
Power Grid ◽  
Difficult Problem ◽  
Stable Operation ◽  
Safe Operation ◽  
Power Station ◽  
Treatment Measures ◽  
Solid Foundation ◽  
Shaft Vibration

The phenomenon of higher shaft vibration and higher bearing temperature is repeated happening during the starting of the 1 000MW coal fired unit of Suizhong power station, seriously endanger the safe operation of the unit, this article mainly aims at the difficult problem of this one technology, by researching on steam turbine work principle and vibration analysis, to find the reason of effect on stability, and to correct all unreasonable factors, to ensure the safe and stable operation of the unit, to laid solid foundation for the construction of the intelligent power grid.

Research of Available Capability of Accommodating PV Power Generation of Tibet Power Grid Based on Capacity of Peak Load Regulation Constraints

2014 ◽  
Vol 1008-1009 ◽  
pp. 40-43
Author(s):  
Xiao Yan Jiang ◽  
Chuan He ◽  
Xiao Fei Liu
Keyword(s):  
Power Generation ◽  
Direct Current ◽  
Power Grid ◽  
Peak Load ◽  
Stable Operation ◽  
Power Station ◽  
Load Regulation ◽  
Pv Grid ◽  
Pv Power Generation ◽  
Grid Based

In recent years, along with the continuous expansion of the scale of photovoltaic (PV) power generation in Tibet, the proportion of PV Grid-connected capacity for Tibet power grid became higher increasingly, which brought great challenges to the secure and stable operation of the grids. So we do those studies on the available capability of accommodating PV power generation of Tibet power grid. Based on the way of capacity of peak load regulation and the minimum output in 2012, this paper simulates and analyzes the available capability of accommodating PV power generation under three boundary conditions, considering the factor of Qinghai-Tibet direct current participating in regulation. The analysis supports that the rate of discharging light accounts for 34.09 percent, 20.57 percent and 5.61 percent after PV power station connecting to the grid, if regardless of the measures of depth peak load regulation such as discharging light.

Type Synthesis of Torsional Mass Dampers as Anti-Galloping Devices by Using Planar Four-Bar Mechanisms

2012 ◽  
Vol 215-216 ◽  
pp. 285-288 ◽  
Author(s):  
Jia Lun Yang ◽  
Kuan Jun Zhu ◽  
Bin Liu
Keyword(s):  
Power Grid ◽  
Robotic Manipulators ◽  
Type Synthesis ◽  
Safe Operation

The type synthesis of torsional mass dampers (TMDs for short) as anti-galloping devices is very import for the safe operation of power grid. In this paper, the TMDs are considered as passive robotic manipulators, with the aim of introducing planar four-bar mechanisms into the synthesis of TMDs. By utilizing one planar four-bar mechanism or two planar four-bar mechanisms in a single TMDs, 6 TMDs with symmetrical structures and 18 TMDs with non-symmetrical structures are synthesized, which may improve the reasonable applications of the TMDs for the solving the anti-galloping issue of power grid.

Numerical Simulation of Flow in Imported Steam Turbine Inlet Components with Equilibrated Holes in High Performance

2013 ◽  
Vol 712-715 ◽  
pp. 1263-1267
Author(s):  
Shan Tu ◽  
Shu Ming Wu ◽  
Qi Zhou ◽  
Hong Mei Zhang ◽  
Xiao Qing Zhu
Keyword(s):  
Flow Field ◽  
Steam Turbine ◽  
High Performance ◽  
Optimization Design ◽  
Great Influence ◽  
Control Valve ◽  
Stable Operation ◽  
Valve Seat ◽  
Valve Disc ◽  
Interior Flow

The main inlet component of steam turbine is control valve. The stable operation of the steam turbine control valve is vital for safe and stable operation of the steam turbine and safety production of the power plant. However, due to the complexity of the structure and unsteady characteristics of steam flow in the valve, there is not enough experimental method about the detailed flow characteristics of the area near control valve disc and the inside of the valve chamber up to now. This article is to focus on the simulation of the steam turbine control valve interior flow field which includes the valve pre-inlet channel in different conditions, then find the reasons which caused instability and pressure loss of the control valve by analyzing the flow field details, finally further optimization design. The profile matching of the valve disc and valve seat has a great influence on the interior flow field of control valve, so analysis of the high performance valve disc shape and divergence angle of valve seat is carried out, and the research conclusion is used for guide design and development of the control valve.

Reliable Analysis on Fast Valving of Ultra-Supercritical Unit Under Transient Fault Conditions

2017 ◽  
Author(s):  
Yu Cai ◽  
Wei Li ◽  
Bao Zhang ◽  
Wenjian Wu ◽  
Deren Sheng ◽  
...  
Keyword(s):  
Power System ◽  
Steam Turbine ◽  
Dynamic Model ◽  
Transient Stability ◽  
Power Grid ◽  
Load Shedding ◽  
Control Mode ◽  
Normal Operation ◽  
Transient Fault ◽  
The Stability

Fast valving of ultra-supercritical unit has great effects on over-speed prevention, load-shedding control, transient stability analysis of electrical system and other security problems. The purpose of fast valving is to maintain the stability of power system once fault or load shedding of unit occurs in the electric power system. Therefore, it is of great significance to study the reliability of fast valving for ultra-supercritical unit. In this paper, the KU ( short shedding) logic condition of SIEMENS T3000 system is analyzed as the research object of fast valving. The unit can be avoided over speed by monitoring the unit load and fast valving under faulty grid conditions based on the KU control. A series of measures will be taken after KU is triggered, for instance the governing valving will be closed quickly and the DEH (digital electro-hydraulic) control of the steam turbine will be switched to speeding control mode. On the other hand, the unit will return to normal operation if the transient fault of power grid disappears. The key contributions of this thesis include three parts: Firstly, based on the analysis of control characteristics of ultra-supercritical unit and protective logic and triggered conditions of KU function, a novel dynamic model by coupling the fast valving of steam turbine and the transient stability of generator is established by applying the PSCAD software. Then, the dynamic response process of ultra-supercritical unit is simulated and calculated by adopting the coupling dynamic model when KU function is triggered. Also the influence factors and reliability of fast valving are analyzed under transient fault conditions. Finally, two optimized measures by increasing the time delay and the speed of quantitative judgment are put forward to reduce risks and avoid the misoperation of signal distortion which may be caused by the power transmitter under transient fault conditions. The results of this study can not only help to evaluate the reliability of fast valving function scientifically in power grid transient fault, but also guide the technicians to analyze the stability of the power grid.

scholarly journals Vibration Analysis of Kenyir Dam Power Station Structure Using a Real Scale 3D Model

2019 ◽  
Vol 29 (3) ◽  
pp. 48-59
Author(s):  
Azizi Arbain ◽  
Ahmad Zhafran Ahmad Mazlan ◽  
Mohd Hafiz Zawawi ◽  
Mohd Rashid Mohd Radzi
Keyword(s):  
Vibration Analysis ◽  
3D Model ◽  
Natural Frequencies ◽  
External Disturbance ◽  
Resonance Phenomenon ◽  
Mode Shapes ◽  
Response Analysis ◽  
Power Station ◽  
Real Scale ◽  
Station Structure

Abstract In this paper, the vibration analysis in terms of modal and harmonic responses are investigated for the power station structure of Kenyir Dam in Terengganu, Malaysia. Modal analysis is carried out to provide the dynamic characteristics of the power station which includes the natural frequencies and mode shapes. Meanwhile, the harmonic response analysis is performed by applying the force to the structure to obtain the Frequency Response Function (FRF) in certain range of frequencies. A real scale three-dimensional (3D) model of the Kenyir Dam power station is constructed using SolidWorks software and imported to ANSYS software for the Finite Element (FE) analysis. A proper boundary condition is taken into consideration to demonstrate the real behaviour of the power station structure. From the results, six most significant natural frequencies and mode shapes including the FRF in all three axes are selected. The highest natural frequency value occurred at 5.4 Hz with the maximum deflection of 0.90361 m in the z axis direction. This value is important in order to verify whether the structure can overcome the resonance phenomenon from the external disturbance forces in the future.

Mid-Term Stability Assessment of Jiangxi Power Grid

2013 ◽  
Vol 732-733 ◽  
pp. 882-887
Author(s):  
Yong Chun Su ◽  
Hao Wei Jia
Keyword(s):  
Power System ◽  
Power Grid ◽  
Assessment Method ◽  
Control Measures ◽  
Assessment Process ◽  
Jiangxi Province ◽  
Stable Operation ◽  
Stability Assessment ◽  
Term Stability ◽  
The Stability

Mid-term stability assessment is an important work to support power system operation in a province power grid of China every year. The stability assessment method and process was introduced in this paper. As an example, the stability of Jiangxi province power system was evaluated in the following two years. Weak area and weak transmission line were found out in each power supply area. Prevention and control measures were proposed. According to problems among the assessment process and using the state monitoring data, an approach was discussed to increase the assessment result accuracy. The analysis conclusion provides the reference to the safe and stable operation of Jiangxi power system.

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