Alternative approaches for linear analysis and prediction of a synchronous generator under partial- and full-load rejection tests

Wamkeue, R.; Jolette, C.; Kamwa, Innocent

doi:10.1049/iet-epa:20060217

Cited by 8 publications

(1 citation statement)

References 9 publications

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“…At normal operation, these electromagnetic forces created by stator current cause vibration at twice the natural frequency, whereas under fault conditions the electromagnetic forces will be much larger than the normal operation tending to high vibration [5,6]. In order to evade the additional vibration, it is necessary to predict and evaluate the electromagnetic forces accumulating with natural frequencies of the machine [7][8][9][10]. Apart from internal and short circuit faults sudden load disconnection induces transients and vibrations severely which have been noticed in commissioned hydropower projects [11,12].…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental illustration of vibration at load rejection in a continuously overloaded large hydrogenerator

Carounagarane

Chelliah

Sarma³

2020

IET Renewable Power Generation

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Large hydro generators are usually overloaded at various situations such as the period when excess water is available and when excess inflow is to be discharged. The period may have extended to many weeks under exigent conditions e.g. six weeks in case of a 1000 MW hydropower plant (HPP) located at northern region, India at 20% overload. All the performance related parameters including vibrations were observed during commissioning except runaway speed test at load rejection. At overloads, if there is a sudden load rejection the vibration transients will be even more severe due to drop in current and internal impedance. Hence this paper aims to analyze the vibration signature of large synchronous generator (SG) when operated at overloads and subjected to sudden load rejection. The substantiation of the factual model of 250 MW hydro generating units (HGU) replicating the case plant has been simulated using SIMSEN software. Apart from case report and simulative validation an experimental verification is also conducted with a prototype model of 2.2 kW SG. This paper provides the feasibility to operate the SG's 20% beyond its rated load as designed with proper maintenance and safety carried out by plant operators.

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Section: Introductionmentioning

confidence: 99%

Simulation and experimental illustration of vibration at load rejection in a continuously overloaded large hydrogenerator

Carounagarane

Chelliah

Sarma³

2020

IET Renewable Power Generation

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High-speed de-excitation system for brushless synchronous machines

Platero¹,

Redondo

Blázquez³

et al. 2012

IET Electr. Power Appl.

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This study presents a novel high-speed de-excitation system for brushless synchronous machines, where the de-excitation time constant can reach values of several seconds. In these conditions, despite the proper operation of the protection system, the slow de-excitation time constant may produce severe damage in the event of an internal short circuit. With the proposed system, a rapid de-excitation is achieved by inserting a resistance in the field circuit, obtaining a response similar to that in machines with static excitation. This system has been validated through computer simulations and experimental laboratory tests.

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Dynamic Study and Analysis of Synchronous Generator under Sudden Short Circuit and Load Rejection Tests

Tiomo

Kenfack

Wamkeue

2019

2019 IEEE/IAS 55th Industrial and Commercial Power Systems Technical Conference (I&CPS)

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Alternative approaches for linear analysis and prediction of a synchronous generator under partial- and full-load rejection tests

Cited by 8 publications

References 9 publications

Simulation and experimental illustration of vibration at load rejection in a continuously overloaded large hydrogenerator

Simulation and experimental illustration of vibration at load rejection in a continuously overloaded large hydrogenerator

High-speed de-excitation system for brushless synchronous machines

Dynamic Study and Analysis of Synchronous Generator under Sudden Short Circuit and Load Rejection Tests

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