Loss of excitation of synchronous generator

Krištof, Vladimír; Mešter, Marián

doi:10.1515/jee-2017-0007

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…The LOE is a frequent fault in synchronous machine operating, and based on the statistic; it accounts for 69% of all generator failures. The excitation source can be partially or entirely fail due to a short circuit in the field winding, accidental field breaker opening, and a breakdown in the excitation system [31], [37]- [39].…”

Section: Generator Outagementioning

confidence: 99%

Emergency congestion management of power systems by static synchronous series compensator

Zaidan

Toos

2022

IJEECS

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<span>From a transmission system point of view, any overload on the grid lines during operation in situations such as peak load or emergency conditions include line outage or generator outage, is refers to congestion. Generally, the congestion can be managed by controlling power flow. On the other hand, series compensation has a significant role in control power flow; therefore, series compensation equipment like fixed series capacitor (FSC), thyristor-controlled series capacitor (TCSC), and static synchronous series compensator (SSSC) can be used for congestion management. In this paper, an SSSC is used in a transmission line to manage congestion in emergency conditions, line outage and generator outage. The congestion rent contribution method has been used to determine the location of the SSSC in the IEEE 14-bus test system. This technique finds the transmission line 1-2 (from bus 1 to bus 2) is the best location of the SSSC to reduce congestion. After installing an SSSC in the specified line, simulation results show that the power flow has been controlled, leading to reducing the congestion. In other words, the effectiveness of the SSSC can be seen in reducing the total congestion rent, the total generation cost, and network losses.</span>

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Section: Generator Outagementioning

confidence: 99%

Emergency congestion management of power systems by static synchronous series compensator

Zaidan

Toos

2022

IJEECS

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“…This may also results in overloading of transmission lines/transformers and miss-operation of over current relay by considering overloading as fault. In addition to this, in parallel operating generators after LOE the non-fault machines start to increase the reactive power production which leads to a severe damage to the grid [22], [24].…”

Section: Impacts Of Loss Of Excitationmentioning

confidence: 99%

“…Thus the excitation system keeps the generator in synchronous with the grid. The occurrence of outages in excitation systems may induce abnormal operating consequences [22], [23].…”

Section: Synchronous Machine Excitation Systemmentioning

confidence: 99%

Discrimination of Loss of Excitation Fault in Synchronous Generators from Power Swing Using Machine Learning Approach

Hemavathi¹,

Geethanjali²

2022

Preprint

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Amidst several faults in Synchronous generators, Loss of Excitation (LOE) is the most considerable fault since it affects both the generators and power network. The traditional protection method for LOE is based on impedance trajectory of the machine with negative offset mho relay. Meanwhile the traditional method experiences malfunctions and speed dip in LOE detection. This paper presents machine learning approach to detect LOE fault as well as classification logic to discriminate LOE fault from normal operating conditions and power swing conditions due to Line fault. This paper utilizes Hotelling’s-T2 statistical method to calculate Hotelling’s-T2 based Fault Indices (HT2 -FI) for LOE detection and Support Vector Machine (SVM) for classification. The time series data of electrical quantities such as Terminal voltage and Reactive Power of the generator are extracted from simulated Single Machine Infinite Bus test system and used as input data. This data is involved in calculation of HT2 –FI and in development of classification logic. The proposed method is simulated and verified for complete, partial LOE conditions and power swing conditions. Simulation outcomes depict the notable signs of the proposed method in LOE identification from power swing. Comparative assessment also reports that the method is capable of saving time in detecting LOE.

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“…They are very important during operation under high temperatures, such as those described in [22] by Sławi ński et al, where the temperature reached 800 • C. Axial-flow microturbines use synchronous generators to convert kinetic energy into electric energy [23]. These are commonly used devices; however, they sometimes fail: 69% of all failures in generators can be attributed to loss-of-excitation, which causes a significant increase in speed and their instability [24]. A small number of papers on the fatigue analysis of axial-flow microturbines have been published, and few of them concern methodology for calculating such devices and the typical hazards associated with their operation.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Analysis of the Microturbine Rotor Disc Made of 7075 Aluminium Alloy Using a New Hybrid Calculation Method

Zych

Żywica

2022

Materials

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Today, where the production of any kind of device may have a negative impact on the environment, it is crucial to produce machines that are as efficient as possible but that can also be strong enough to withstand harsh operating conditions for a long time. That is why this paper raises the issue of the fatigue analysis of high-speed axial-flow microturbines whose components are made of commonly used 7075 aluminium alloy. The paper presents different methods that can be used to estimate and increase the fatigue life of a turbine disc. The object of study is a 10-kilowatt vapour microturbine. The various mechanical, flow and thermal loads that can occur during the operation of the microturbine have been analysed so that the most important ones can be taken into account in the final considerations. Stress calculations were performed using analytical equations, and the finite element method (FEM) was also used. Using the stresses obtained and material characteristics, fatigue analysis was conducted. Then, new hybrid calculation methods were proposed, taking into account both analytical and numerical approaches that do not require the use of ready-made programs dedicated to fatigue analysis. To verify these methods, calculations were performed for two rotor discs with different geometries. These methods can be used by both engineers and scientists in the design process of various microturbines when fatigue calculations are performed.

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Loss of excitation of synchronous generator

Cited by 12 publications

References 3 publications

Emergency congestion management of power systems by static synchronous series compensator

Emergency congestion management of power systems by static synchronous series compensator

Discrimination of Loss of Excitation Fault in Synchronous Generators from Power Swing Using Machine Learning Approach

Fatigue Analysis of the Microturbine Rotor Disc Made of 7075 Aluminium Alloy Using a New Hybrid Calculation Method

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