Unsymmetrical fault diagnosis in transmission/distribution networks

Saha, Sajeeb; Aldeen, M.; Tan, Chee Pin

doi:10.1016/j.ijepes.2012.09.005

Cited by 25 publications

(16 citation statements)

References 33 publications

(49 reference statements)

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“…The net accelerating torque is expressed as (28) Consequently, the swing equation describing the mechanical motion of the synchronous machine (29) In summary, the set of differential equations (7) Combining synchronous machine dynamics along with the dynamics associated with the excitation and speed governor system [24], we obtain the complete dynamics of a generating unit (GU). The states of the th GU in an -bus power system may now be defined as …”

Section: Swing Equationmentioning

confidence: 99%

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Dynamic Modeling of Power Systems Experiencing Faults in Transmission/Distribution Networks

Saha

Aldeen

2015

IEEE Trans. Power Syst.

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In this paper we address some shortcomings in existing nonlinear dynamic models of power system experiencing symmetrical and unsymmetrical faults in their transmission/distribution networks. The shortcomings relate to: 1) approximations relating to stator dynamics, internal voltage of the positive sequence network and the dynamics of the negative and zero sequence networks, and 2) existing models are time -variant, which may not be suitable for system studies such as stability and fault detection studies that require time invariant model. The approximations outlined in 1) adversely affect the modeling accuracy, especially that of the system response during the period immediately after the occurrence of faults. We present in this paper a full fault-dependent time-invariant dynamical model of power systems experiencing symmetrical and unsymmetrical faults in their transmission/distribution networks and verify it through simulation studies mimicking real life scenarios. IEEE 30 bus power system is considered as the study case. The simulation results are compared to Matlab's "SimPower" and PSCAD/EMTDC software packages.

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Section: Swing Equationmentioning

confidence: 99%

“…),(23),(24) and swing equation (29) completely describes the synchronous machine dynamic behavior under both normal and fault (symmetrical and unsymmetrical) conditions.…”

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confidence: 99%

Dynamic Modeling of Power Systems Experiencing Faults in Transmission/Distribution Networks

Saha

Aldeen

2015

IEEE Trans. Power Syst.

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“…If the power is disrupted, an excitation system will kick in to prevent power failure before accident or damage can occur. The excitation system is part of the emergency diesel generator and produces adequate voltage and supplies the currents to the The defects in power system components have been a serious problem in modern power systems and many system errors caused by such defects were continuously reported in the last few decades [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Processes 2018, 6, x FOR PEER REVIEW 3 of 29 with the generator stators or rotors [12][13][14]. Also, The defects in power system components have been a serious problem in modern power systems and many system errors caused by such defects were continuously reported in the last few decades [15][16][17][18][19]. Accordingly, the research on the ECS fault detection methods is being carried out actively as the previous research results [20][21][22][23][24][25][26][27] were drawn from the simple excitation system models.…”

Section: Introductionmentioning

confidence: 99%

A Cost-Effective Redundant Digital Excitation Control System and Test Bed Experiment for Safe Power Supply for Process Industry 4.0

Lee

2018

Processes

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Recently, the energy demand and supply situation in the Republic of Korea (ROK) has been largely affected by the fluctuations in the energy markets around the world. Such a situation has provided a basis for requiring improvements to power plant facilities. The automatic generator voltage control systems in large-scale power plants are adopting a rapid-response static excitation method to improve the transient stability. A domestic commercially developed large-scale triple-redundant excitation system is currently operated by the 1000 MW-class nuclear power plant and its efficiency has been verified at the same site. However, such a system is too costly for smaller power plants so that a reliable and low-cost redundant digital excitation control system was developed and introduced in this study to resolve the cost problem. The system has improved its stability and reliability at the same time through double (redundant) configuration. Additionally, the system's performance was put to the test by conducting a series of control function tests after applying it to the gas turbine used in a thermal power station. This study includes the development of system hardware, simulations as well as on-site experiments and each element was validated as a result. Also, the study discusses and validates the method used for replacing the protective relays at the Kanudi power plant operating in Papua New Guinea. The replacement of 27 and 81 protective relays at the existing power plant was carried out as they did not function properly. New relays were installed after removing the power supply in the existing panel. The individual power output sections of new relays were connected in parallel with the existing properly functioning relays, as previous protective relays had only allowed monitoring without outputting the contents. Thus, the new protective system was designed to enable both existing and new relays to carry out the detection function. It was validated that the replacement was successful. The new system with the new relays is performing properly by protecting its power generator and preventing further accidents.

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“…Although faults in transmission and distribution networks have received considerable attention in the past few decades [2][3][4][5][6][7][8][9][10][11], there has been little research published on fault diagnosis in excitation systems [12,13]. Although fault detection in excitation systems is the title of a paper reported in [13], a 3 phase full wave rectifier is used to model an exciter and a static load is used to model a power system, no generator or exciter dynamics are considered.…”

Section: Introductionmentioning

confidence: 99%

Faults detection and mitigation in excitation control of synchronous machines in large-scale power grids

Aldeen

Saha

Evans

2015

2015 IEEE 8th GCC Conference &Amp; Exhibition

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This paper presents a new decentralised fault detection and mitigation system for excitation control systems used in synchronous generators in power grids. The system detects and diagnoses faults in the basic components of the excitation control systems with high accuracy and in almost real time using fuzzy set theory. Once a fault is diagnosed, a mitigation action follows, where the signal out of the faulty component is replaced by an alternative signal generated by the fault mitigation system. The mitigation action ensures that the field excitation voltage and thus the terminal voltage of the affected generator are controlled in a way that pre-fault stability of the grid is maintained. The accuracy and effectiveness of the proposed scheme are verified through case studies performed on the IEEE 30 bus test system.

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Unsymmetrical fault diagnosis in transmission/distribution networks

Cited by 25 publications

References 33 publications

Dynamic Modeling of Power Systems Experiencing Faults in Transmission/Distribution Networks

Dynamic Modeling of Power Systems Experiencing Faults in Transmission/Distribution Networks

A Cost-Effective Redundant Digital Excitation Control System and Test Bed Experiment for Safe Power Supply for Process Industry 4.0

Faults detection and mitigation in excitation control of synchronous machines in large-scale power grids

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