Danger of underground erosion and sinking of the building of pumped storage energy plant in Zagorsk

Using the probabilistic approach, authors consider the case of development of a dangerous geological phenomenon i.e. the large underground erosive channel, induced by a mechanical suffusion during construction of the pumped storage energy plant in Zagorsk (PSEP-2). Formation of the erosive channel has led to the formation of cavities with the diameter up to 10 metres in the middle and upper-quarternary, suffusion-unstable, the fluvial-and-glacial and lake-glacial deposits of the Moscow and Dnieper moraine. Thin deposits were the bearing basis of the concrete construction of the dam of PSEP-2 in Zagorsk. The lack of proper consideration of difficult engineering-and-geological conditions and the subsequent formation of emptiness has led to the unilateral draft of the building of PSEP-2 in Zagorsk. Draft of the building of PSEP-2 in Zagorsk has detained the start-up of the building into maintenance and has resulted in significant economic damage.

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Research and Develop on Static Frequency Converter of Pumped Storage Power Plant

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.608-609.1120 ◽

2012 ◽

Vol 608-609 ◽

pp. 1120-1126 ◽

Cited By ~ 1

Author(s):

De Shun Wang ◽

Bo Yang ◽

Lian Tao Ji

Keyword(s):

Power Plant ◽

Control Strategy ◽

Large Scale ◽

Frequency Converter ◽

Position Estimation ◽

Position Sensor ◽

Storage Unit ◽

Rotor Position ◽

Start Up ◽

Pumped Storage

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

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Self-adaption Faster-than-real-time Temperature Prediction Technology of Pumped Storage Power Unit in Start-up State

2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2) ◽

10.1109/ei250167.2020.9346765 ◽

2020 ◽

Author(s):

Hao Zhang ◽

Man Chen ◽

Yumin Peng ◽

Yanming Gao

Keyword(s):

Real Time ◽

Power Unit ◽

Temperature Prediction ◽

Start Up ◽

Pumped Storage

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AI-Based Susceptibility Analysis of Shallow Landslides Induced by Heavy Rainfall in Tianshui, China

Remote Sensing ◽

10.3390/rs13091819 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1819

Author(s):

Tianjun Qi ◽

Yan Zhao ◽

Xingmin Meng ◽

Guan Chen ◽

Tom Dijkstra

Keyword(s):

Machine Learning ◽

Landslide Susceptibility ◽

Heavy Rainfall ◽

Human Life ◽

Relative Weight ◽

Shallow Landslides ◽

Mitigation Measures ◽

Slope Aspect ◽

Economic Damage ◽

Geological Conditions

Groups of landslides induced by heavy rainfall are widely distributed on a global basis and they usually result in major losses of human life and economic damage. However, compared with landslides induced by earthquakes, inventories of landslides induced by heavy rainfall are much less common. In this study we used high-precision remote sensing images before and after continuous heavy rainfall in southern Tianshui, China, from 20 June to 25 July 2013, to produce an inventory of 14,397 shallow landslides. Based on the results of landslide inventory, we utilized machine learning and the geographic information system (GIS) to map landslide susceptibility in this area and evaluated the relative weight of various factors affecting landslide development. First, 18 variables related to geomorphic conditions, slope material, geological conditions, and human activities were selected through collinearity analysis; second, 21 selected machine learning models were trained and optimized in the Python environment to evaluate the susceptibility of landslides. The results showed that the ExtraTrees model was the most effective for landslide susceptibility assessment, with an accuracy of 0.91. This predictive ability means that our landslide susceptibility results can be used in the implementation of landslide prevention and mitigation measures in the region. Analysis of the importance of the factors showed that the contribution of slope aspect (SA) was significantly higher than that of the other factors, followed by planar curvature (PLC), distance to river (DR), distance to fault (DTF), normalized difference vehicle index (NDVI), distance to road (DTR), and other factors. We conclude that factors related to geomorphic conditions are principally responsible for controlling landslide susceptibility in the study area.

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An Integrated Start-Up Method for Pumped Storage Units Based on a Novel Artificial Sheep Algorithm

Energies ◽

10.3390/en11010151 ◽

2018 ◽

Vol 11 (1) ◽

pp. 151 ◽

Cited By ~ 23

Author(s):

Zanbin Wang ◽

Chaoshun Li ◽

Xinjie Lai ◽

Nan Zhang ◽

Yanhe Xu ◽

...

Keyword(s):

Start Up ◽

Pumped Storage ◽

Storage Units

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Three-Dimensional CFD Simulations of Start-Up Processes of a Pump-Turbine Considering Governor Regulation

Energies ◽

10.3390/en14248507 ◽

2021 ◽

Vol 14 (24) ◽

pp. 8507

Author(s):

Zhiyan Yang ◽

Yongguang Cheng ◽

Ke Liu ◽

Xiaoxia Hou ◽

Xiaoxi Zhang ◽

...

Keyword(s):

Rotational Speed ◽

Three Dimensional ◽

Load Condition ◽

Internal Flow ◽

Pump Turbine ◽

Characteristic Region ◽

Start Up ◽

Speed Fluctuation ◽

Pumped Storage ◽

Cfd Method

The pumped-storage power station is an efficient stability regulator of the power grid. However, due to the instability of the pump-turbine in the S-shaped characteristic region, rotational speed fluctuation is easy to occur in the speed no-load condition, making synchronization with and connection to the grid difficult. To investigate the key factors of these difficult grid connections, the start-up processes of a practical pump-turbine under the lowest head condition were simulated by using the three-dimensional CFD method, in which the governor regulating equations with different regulating parameters were integrated successfully. The results show that the working points oscillate with the fluctuations of rotational speed, discharge, and torque, and different regulating parameters have a significant influence on the dynamic histories. In addition, the internal flow patterns, especially the backflows at the runner inlet, keep apparent values at the middle span (0.5 span) but have regular transitions near the shroud side (0.7–0.8 span). The faster the guide vanes adjust, the faster the backflows change, and the larger the macro parameters fluctuate. Overall, the instability of the start-up is the result of the periodical evolutions of backflows at the runner inlet, because the trend and period of the radial velocities at different inlet span locations are consistent with those of the discharge.

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Deriaz Type Reversible Pump-Turbine Installation at Sir Adam Beck-Niagara Forebay Pumped Storage Project

Journal of Basic Engineering ◽

10.1115/1.4008540 ◽

1959 ◽

Vol 81 (4) ◽

pp. 505-515

Author(s):

A. E. Aeberli

Keyword(s):

Mechanical Design ◽

Operating Conditions ◽

Pump Turbine ◽

Niagara River ◽

Performance Requirements ◽

Start Up ◽

Pumped Storage ◽

Tail Water ◽

Power Project ◽

Turbine Installation

This paper describes the new adjustable blade, single-speed, vertical, single-runner reversible pump-turbine units recently developed and placed into service at Ontario Hydro’s forebay storage pumping-generating station at the S.A.B. Power Project on the Niagara River. The units operate under unusual variations in head. In the pumping sequence the limits are 59 and 90 ft and in the turbine cycle from 45 to 85 ft. Tailwater depression is not required on start-up. Change-over from turbine to pumping sequence is accomplished in a matter of minutes and occurs several times each day. Data are given on the performance requirements for capacity and efficiency versus hydraulic operating conditions of head, tail water, and forebay reservoir levels. Information in the paper includes unusual features of mechanical design.

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A Case History on the Application and Operation of Gas Turbines and Waste Heat Boilers in a Total Energy Cycle for a Major Chemical Manufacturing Complex

Volume 1B: General ◽

10.1115/74-gt-139 ◽

1974 ◽

Author(s):

J. P. Zanyk

Keyword(s):

Total Energy ◽

Gas Turbines ◽

Waste Heat ◽

Chemical Manufacturing ◽

Energy Needs ◽

Start Up ◽

Energy Cycle ◽

Energy Plant ◽

Major Chemical ◽

Cycle Efficiency

A brief history on the application, start-up and operation of two gas turbines with waste heat recovery boilers in a combined energy cycle, integrated with an existing power plant to provide the total energy needs for a major chemical manufacturing complex. This paper describes an installation with some unique design features to provide for maximum cycle efficiency and reliability and discusses the major problems and difficulties experienced in putting this complex energy plant into operation.

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