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Pavel V Gromyko - One of the best experts on this subject based on the ideXlab platform.
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what caused the accident at the sayano shushenskaya Hydroelectric Power Plant sshpp a seismologist s point of view
Seismological Research Letters, 2014Co-Authors: Victor Seleznev, Alexey V Liseikin, Alexey A Bryksin, Pavel V GromykoAbstract:The Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP) is the greatest Power Plant in Russian history due to its highly rated capacity. This ranks it at number 7 in a list of Hydroelectric Power Plants worldwide (Fig. 1). Figure 1. Location of the Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP). It is an upstage of Enisey’s series of Hydroelectric stations. The station’s unique arch‐gravity dam is the highest in Russia and one of the highest in the world. It has a maximum height of 242 m, its upstream face is delineated with an arc of 600 m in radius, with a width of 105.7 m in its basement and 25 m in its crown. The length of the dam’s crown with waterside inserts is 1074.4 m. Ten axial galleries are located in the body of the dam, which contain equipment to monitorthe dam’s condition and allow access for repair work. Ten Hydroelectric generators with centrifugal turbines are located in the SSHPP building, each has a Power of 640 MW and works under a water head from 175 up to 220 m. Construction of the Plant was started in 1963 and was completed in 2000. There were a number of problems concerning the destruction of spillways and forming of cracks in the body of the dam, which occurred during the beginning period of construction and operation, but these were successfully resolved. The greatest anthropogenic accident happened within the Plant at 8:13 a.m. local time (0:13 UTC) on 17 August 2008. Hydroelectric generator number 2 (HG2) suddenly destroyed itself during operation and was thrown from its position by water pressure. Water began to come into the turbine hall at a vast rate. At the moment of destruction, the total Power within the Plant was about 4100 MW; there were nine Hydroelectric generators in operation. Unfortunately, most of the automatic self‐protection systems were not actuated. The …
Yi Teng - One of the best experts on this subject based on the ideXlab platform.
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Regulation quality for frequency response of turbine regulating system of isolated Hydroelectric Power Plant with surge tank
International Journal of Electrical Power and Energy Systems, 2015Co-Authors: Wencheng Guo, Jieping Chen, Jiandong Yang, Weijia Yang, Yi TengAbstract:Aiming at the isolated Hydroelectric Power Plant (HPP) with surge tank, this paper studies the regulation quality for frequency response of turbine regulating system under load disturbance. Firstly, the complete mathematical model of turbine regulating system is established and a fifth order frequency response under step load disturbance is derived. Then, the method of primary order reduction and secondary order reduction, for this complete fifth order system of frequency response, is proposed based on dominant poles. By this method, the complete fifth order system is solved and the regulation quality for frequency response is studied. The results indicate that the complete fifth order system always has a pair of dominant conjugate complex poles and three non-dominant poles. The primary fourth order equivalent system, which is obtained by primary order reduction, keeps the dominant poles almost unchanged, therefore it can represent and replace the complete fifth order system and it is obviously superior to other fourth order systems. The primary fourth order equivalent system is superimposed by two second-order subsystems, one of them is corresponding to two non-dominant real poles (i.e. head wave) and the other one is corresponding to a pair of dominant conjugate complex poles (i.e. tail wave), respectively. In the fluctuation process of frequency response, head wave decays very fast and works mainly in the beginning period while tail wave decays very slowly, fluctuates periodically and works throughout the period. The secondary order reduction of complete fifth order system can be conducted by using the second order system of tail wave, which is the main body of frequency response, to represent the fluctuation characteristics. The most important dynamic performance index that evaluates the regulation quality, i.e. settling time, is derived from the fluctuation equation of tail wave. The different characteristic parameters of turbine regulating system have different influences on the change rules of head wave, tail wave and settling time.
Victor Seleznev - One of the best experts on this subject based on the ideXlab platform.
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what caused the accident at the sayano shushenskaya Hydroelectric Power Plant sshpp a seismologist s point of view
Seismological Research Letters, 2014Co-Authors: Victor Seleznev, Alexey V Liseikin, Alexey A Bryksin, Pavel V GromykoAbstract:The Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP) is the greatest Power Plant in Russian history due to its highly rated capacity. This ranks it at number 7 in a list of Hydroelectric Power Plants worldwide (Fig. 1). Figure 1. Location of the Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP). It is an upstage of Enisey’s series of Hydroelectric stations. The station’s unique arch‐gravity dam is the highest in Russia and one of the highest in the world. It has a maximum height of 242 m, its upstream face is delineated with an arc of 600 m in radius, with a width of 105.7 m in its basement and 25 m in its crown. The length of the dam’s crown with waterside inserts is 1074.4 m. Ten axial galleries are located in the body of the dam, which contain equipment to monitorthe dam’s condition and allow access for repair work. Ten Hydroelectric generators with centrifugal turbines are located in the SSHPP building, each has a Power of 640 MW and works under a water head from 175 up to 220 m. Construction of the Plant was started in 1963 and was completed in 2000. There were a number of problems concerning the destruction of spillways and forming of cracks in the body of the dam, which occurred during the beginning period of construction and operation, but these were successfully resolved. The greatest anthropogenic accident happened within the Plant at 8:13 a.m. local time (0:13 UTC) on 17 August 2008. Hydroelectric generator number 2 (HG2) suddenly destroyed itself during operation and was thrown from its position by water pressure. Water began to come into the turbine hall at a vast rate. At the moment of destruction, the total Power within the Plant was about 4100 MW; there were nine Hydroelectric generators in operation. Unfortunately, most of the automatic self‐protection systems were not actuated. The …
Wencheng Guo - One of the best experts on this subject based on the ideXlab platform.
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combined effect of upstream surge chamber and sloping ceiling tailrace tunnel on dynamic performance of turbine regulating system of Hydroelectric Power Plant
Chaos Solitons & Fractals, 2017Co-Authors: Wencheng Guo, Jiandong YangAbstract:Abstract Based on the nonlinear mathematical model of the turbine regulating system of Hydroelectric Power Plant with upstream surge chamber and sloping ceiling tailrace tunnel and the Hopf bifurcation theory, this paper firstly studies the dynamic performance of the turbine regulating system under 0.5 times Thoma sectional area of surge chamber, and reveals a novel dynamic performance. Then, the relationship between the two bifurcation lines and the wave superposition of upstream surge chamber and sloping ceiling tailrace tunnel is analyzed. Finally, the effect mechanisms of the wave superposition on the system stability are investigated, and the methods to improve the system stability are proposed. The results indicate that: Under the combined effect of upstream surge chamber and sloping ceiling tailrace tunnel, the dynamic performance of the turbine regulating system of Hydroelectric Power Plant shows an obvious difference on the two sides of the critical sectional area of surge chamber. There are two bifurcation lines for the condition of 0.5 times Thoma sectional area, i.e. Bifurcation line 1 and Bifurcation line 2, which represent the stability characteristics of the flow oscillation of “penstock-sloping ceiling tailrace tunnel” and the water-level fluctuation in upstream surge chamber, respectively. The stable domain of the system is determined by Bifurcation line 2. The effect of upstream surge chamber mainly depends on its sectional area, while the effect of the sloping ceiling tailrace tunnel mainly depends on the sectional area of surge chamber, type of load disturbance and ceiling slope angle. When the stable domain is determined by Bifurcation line 1, the combined effect of upstream surge chamber and sloping ceiling tailrace tunnel on stability equals to the linear superposition of their own effects play alone. When the stable domain is determined by Bifurcation line 2, the only way to improve the system stability is to increase the sectional area of upstream surge chamber.
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Regulation quality for frequency response of turbine regulating system of isolated Hydroelectric Power Plant with surge tank
International Journal of Electrical Power and Energy Systems, 2015Co-Authors: Wencheng Guo, Jieping Chen, Jiandong Yang, Weijia Yang, Yi TengAbstract:Aiming at the isolated Hydroelectric Power Plant (HPP) with surge tank, this paper studies the regulation quality for frequency response of turbine regulating system under load disturbance. Firstly, the complete mathematical model of turbine regulating system is established and a fifth order frequency response under step load disturbance is derived. Then, the method of primary order reduction and secondary order reduction, for this complete fifth order system of frequency response, is proposed based on dominant poles. By this method, the complete fifth order system is solved and the regulation quality for frequency response is studied. The results indicate that the complete fifth order system always has a pair of dominant conjugate complex poles and three non-dominant poles. The primary fourth order equivalent system, which is obtained by primary order reduction, keeps the dominant poles almost unchanged, therefore it can represent and replace the complete fifth order system and it is obviously superior to other fourth order systems. The primary fourth order equivalent system is superimposed by two second-order subsystems, one of them is corresponding to two non-dominant real poles (i.e. head wave) and the other one is corresponding to a pair of dominant conjugate complex poles (i.e. tail wave), respectively. In the fluctuation process of frequency response, head wave decays very fast and works mainly in the beginning period while tail wave decays very slowly, fluctuates periodically and works throughout the period. The secondary order reduction of complete fifth order system can be conducted by using the second order system of tail wave, which is the main body of frequency response, to represent the fluctuation characteristics. The most important dynamic performance index that evaluates the regulation quality, i.e. settling time, is derived from the fluctuation equation of tail wave. The different characteristic parameters of turbine regulating system have different influences on the change rules of head wave, tail wave and settling time.
Alexey V Liseikin - One of the best experts on this subject based on the ideXlab platform.
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what caused the accident at the sayano shushenskaya Hydroelectric Power Plant sshpp a seismologist s point of view
Seismological Research Letters, 2014Co-Authors: Victor Seleznev, Alexey V Liseikin, Alexey A Bryksin, Pavel V GromykoAbstract:The Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP) is the greatest Power Plant in Russian history due to its highly rated capacity. This ranks it at number 7 in a list of Hydroelectric Power Plants worldwide (Fig. 1). Figure 1. Location of the Sayano–Shushenskaya Hydroelectric Power Plant (SSHPP). It is an upstage of Enisey’s series of Hydroelectric stations. The station’s unique arch‐gravity dam is the highest in Russia and one of the highest in the world. It has a maximum height of 242 m, its upstream face is delineated with an arc of 600 m in radius, with a width of 105.7 m in its basement and 25 m in its crown. The length of the dam’s crown with waterside inserts is 1074.4 m. Ten axial galleries are located in the body of the dam, which contain equipment to monitorthe dam’s condition and allow access for repair work. Ten Hydroelectric generators with centrifugal turbines are located in the SSHPP building, each has a Power of 640 MW and works under a water head from 175 up to 220 m. Construction of the Plant was started in 1963 and was completed in 2000. There were a number of problems concerning the destruction of spillways and forming of cracks in the body of the dam, which occurred during the beginning period of construction and operation, but these were successfully resolved. The greatest anthropogenic accident happened within the Plant at 8:13 a.m. local time (0:13 UTC) on 17 August 2008. Hydroelectric generator number 2 (HG2) suddenly destroyed itself during operation and was thrown from its position by water pressure. Water began to come into the turbine hall at a vast rate. At the moment of destruction, the total Power within the Plant was about 4100 MW; there were nine Hydroelectric generators in operation. Unfortunately, most of the automatic self‐protection systems were not actuated. The …
