A simple dynamical model of hydropower plant: stability and oscillations

Леонов, Г. А.; Kuznetsov, Nikolay V.; Solovyeva, E.P.

doi:10.1016/j.ifacol.2015.09.262

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…The guide vanes consist of a number of blades that can be adjusted in order to increase or reduce the f low rate through the turbine. The speed-power governing system of the turbine adjusts the turbine-generator speed based on the feedback signals of deviations of both the grid f requency and micro-generator with respect to their reference settings [44][45][46]. A synchronizer checks the conditions delivered by the vectors:…”

Section: Operation Of Hydroelectric Generator During Grid Disturbancesmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Jarzyna¹

2019

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The process of synchronization of synchronous generators and power electronic converters with the power grid may take on quite different forms. This is due to their specific principles of operation and essential differences in energy conversion process. However, since synchronous generators and power converter often operate in the same utility network, coherent rules should be defined for them. Therefore, this paper aims at a formulation of the uniform and consistent interpretation of synchronization with the power grid for both types of aforementioned units. The author starts from the classic interpretation of synchronization for synchronous generators and power electronic converters, considered as micro-generators, specifies their mathematical and numerical models and then performs simulation tests. Selected synchronization algorithms are described in detail. Simulation tests are used for analysis of the elaboration of outcomes. The results of simulation tests are handled to formulate a uniform interpretation of synchronization for the micro-generation systems considered. Based on the results obtained, appropriate parallels are built between the two systems being compared. It is shown that the synchronization processes are identical regardless of the micro-generation unit considered. Nonetheless, they differ significantly due to their properties in transient states.Inverter systems have higher dynamics but their disadvantage lies in the relatively high sensitivity to disturbances and the complex selection process of the synchronization algorithm.

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Section: Operation Of Hydroelectric Generator During Grid Disturbancesmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Jarzyna¹

2019

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“…Following [30], let us consider the main constructive elements of hydropower unit. The hydropower unit in Fig.…”

Section: Components Of Hydropower Unitmentioning

confidence: 99%

A dynamical model of Sayano-Shushenskaya hydropower plant: stability, oscillations, and accident

Leonov,

Kuznetsov,

Solovyeva

2015

Preprint

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This work is devoted to the construction and study of a mathematical model of hydropower unit, consisting of synchronous generator, hydraulic turbine, and speed governor. It is motivated by the accident happened on the Sayano-Shushenskaya hydropower plant in 2009 year. Parameters of the Sayano-Shushenskaya hydropower plant were used for modeling the system. Oscillations in zones, which were not recommended for operation, were found. The obtained results are consistent with the full-scale test results carried out for hydropower units of the Sayano-Shushenskaya hydropower plant in 1988.

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“…As a result of this, the system could not respond to the change required by the grid, which led to the over-speeding of the unit having de-loaded. 75 people died as a result of the incident and the entire power plant with 6400 MW was almost totally destroyed (Kuznetsov, Yuldashev, & Yuldashev, 2021;Leonov, Kuznetsov, & Solovyeva, 2015;Naymushin, 2009). This recent incident reveals the necessity of considering governing systems in hydroelectric plants as a safety critical system.…”

Section: Introductionmentioning

confidence: 99%

Safety Assessment of Speed Governing Systems in Hydroelectric Power Plants: A Functional Safety Perspective

Kaymakçı

BALCI²

2023

Journal of Advanced Research in Natural and Applied Sciences

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In line with the advancing technology, reliability has become one of the critical factors to be taken into consideration by the operators in the energy sector to minimize losses regarding cost and time. This issue is directly related to the reliability of the elements, namely the subsystems that make up the system. This study examines the control architecture of speed governing system within the turbine control system of hydroelectric power plants, which has to be regarded as a critical system and provides an indispensable source of guidance and knowledge to researchers and also implementation engineers as well. For this perspective, a reliability analysis has been performed for the speed governing system and the risks with the control system have been revealed. Taking IEC 61508 and IEC 61511 standards as reference within this scope, the safety concepts and the related parameters have been explained and the corresponding methods for risk analysis have been mentioned. As a result, a new safety-related control system configu-ration overcoming the unacceptable risks with the speed governing system has also been proposed. It has been proved that safety integrity level of the proposed safety-related control system is at the desired level that can make the related safety related functions verify the identified safety level

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A simple dynamical model of hydropower plant: stability and oscillations

Cited by 12 publications

References 2 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

A dynamical model of Sayano-Shushenskaya hydropower plant: stability, oscillations, and accident

Safety Assessment of Speed Governing Systems in Hydroelectric Power Plants: A Functional Safety Perspective

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