Loss of Excitation Detection in Synchronous Generators Based on Dynamic State Estimation

Marchi, Pablo; Estevez, Pablo Gill; Messina, Francisco; Galarza, Cecilia G.

doi:10.1109/tec.2020.2985529

Cited by 21 publications

(8 citation statements)

References 25 publications

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“…It is assumed that the angular velocity of both machines and therefore the frequencies are equal, but due to the wrong synchronization, the difference increases between them due to growth of the reduction in the excitation level of the rotor of the second machine, and as shown in the figures (6,7). Because of the wrong synchronization, the terminal voltage of both machines decrease with the decrease in the excitation level of the second generator rotor, as shown in the figure (8). With an increase in the decrease in the excitation current of the rotor of the second generator, the electromotive force of the first machine is higher than the voltage of the terminals.…”

Section: Simulation and Results At Under Excitation Faulty Synchroniz...mentioning

confidence: 99%

See 1 more Smart Citation

Impact Study of Unequal Voltages of Power Plants (Generators)

juboori¹,

Al-Younus²,

Alrawe³

2022

(AREJ)

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When connecting two generators together (in parallel), there are conditions that must be met and fulfilled before commencing the electrical connection process, which are known as synchronization conditions. In this paper, the loss of equality voltages which is one of the synchronization conditions will be represented when performing the connection process using Matlab and surveying the impact of this on the performance of the system and the extent of damage that may result from it. The presented analysis shows the influence of faulty synchronization on the following physical quantities: internal voltage, stator current, stator voltage, angular mechanical speed, terminal voltages which are the most vulnerable. In addition, knowing the type of fault (short circuit fault) caused by the faulty synchronization condition. In this paper, over and under voltage schemes have been implemented by using MATLAB/SIMULINK.

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Section: Simulation and Results At Under Excitation Faulty Synchroniz...mentioning

confidence: 99%

“…In general, an incorrect voltage magnitude has a significant negative effect on the generator. The alternator synchronization with the power system must be carefully done to prevent equipment damage and disturbances in the power system [8,9,10].…”

Section: Causes Of Poor Rms Voltage Matchingmentioning

confidence: 99%

Impact Study of Unequal Voltages of Power Plants (Generators)

juboori¹,

Al-Younus²,

Alrawe³

2022

(AREJ)

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show abstract

“…Next, we perform a DSE using the algorithm described in section II-A for each generator. The main differences with the work made in [11] are that the complete equations of the GEN-ROU model are used [19], including the saturation functions, and the following definitions for the state, measurement and input vectors are made:…”

Section: Proposed Methodologymentioning

confidence: 99%

Location Method for Forced Oscillation Sources Caused by Synchronous Generators

Marchi¹,

Estevez²,

Galarza³

2021

Preprint

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In this article, we present a new methodology to identify if forced oscillation sources are generated in excitation systems or in turbine governors. In this context, we propose to harness the information that the dynamic state estimation (DSE) provide to be able to apply a dissipating energy flow (DEF) method. The measurements that the phasor measurement units (PMUs) provide are used to estimate the internal states of different generators connected to the same bus. Here, it will be considered that the PMU at the point of connection is only capable of measuring the voltage phasor and the total current phasor. Therefore, the current injection of the generator that is causing the FO is an unobservable variable. To overcome this issue, event playback is applied to simulate the model's response and a comparison between the DSE of multiple generators is made. Finally, when the faulty generator is identified, we compute energy functions for the mechanical control loop and for the excitation control loop. The sign and rate of these energies determine the source of the oscillation, allowing that the FO can be located. Simulated signals are used to show that the proposed method provides a systematic methodology for identification and location of power systems forced oscillations than even could be non-stationary signals.

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“…It is very important to detect these failures timely to avoid the risk of exciter and voltage regulator damages. By relying on the estimated dynamic states and checking the consistency between the control model outputs and expected outputs, the over-excitation and abnormal mechanical power changes can be detected [67]. The multiple models based DSE technique is also developed to detect excitation failures in [31].…”

Section: B Monitoringmentioning

confidence: 99%

Roles of Dynamic State Estimation in Power System Modeling, Monitoring and Operation

Zhao

Netto

Huang

et al. 2021

IEEE Trans. Power Syst.

163

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Power system dynamic state estimation (DSE) remains an active research area. This is driven by the absence of accurate models, the increasing availability of fast-sampled, timesynchronized measurements, and the advances in the capability, scalability, and affordability of computing and communications. This paper discusses the advantages of DSE as compared to static state estimation, and the implementation differences between the two, including the measurement configuration, modeling framework and support software features. The important roles of DSE are discussed from modeling, monitoring and operation aspects for today's synchronous machine dominated systems and the future power electronics-interfaced generation systems. Several examples are presented to demonstrate the benefits of DSE on enhancing the operational robustness and resilience of 21st century power system through time critical applications. Future research directions are identified and discussed, paving This work was partially supported by US Department of Energy under Advanced Grid Modernization Program.

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Loss of Excitation Detection in Synchronous Generators Based on Dynamic State Estimation

Cited by 21 publications

References 25 publications

Impact Study of Unequal Voltages of Power Plants (Generators)

Impact Study of Unequal Voltages of Power Plants (Generators)

Location Method for Forced Oscillation Sources Caused by Synchronous Generators

Roles of Dynamic State Estimation in Power System Modeling, Monitoring and Operation

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