Field Excitation in Relation to Machine and System Operation [includes discussion]

Farnham, S. B.; Swarthout, R. W.

doi:10.1109/aieepas.1953.4498759

Cited by 19 publications

(6 citation statements)

References 1 publication

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“…If the excitation current is decreased, more reactive power is absorbed. The current is limited as well, due to the heating of the windings [3] [4]. The locus of the excitation current can be shown as a circle with centre on the Q axis.…”

Section: Capability Curve Of Synchronous Generatormentioning

confidence: 99%

“…The capability chart of the generator is obtained utilizing the eqns. (1)(2)(3)(4)(5) and is shown in Fig. 1 region (i) and region (ii) operated as generator mode, region (iii) and (iv) operated as condenser mode.…”

Section: Capability Curve Of Synchronous Generatormentioning

confidence: 99%

“…Various models and approaches for determining spot pricing have been proposed in [1][2]. The generators are the major sources of reactive power and it can be obtained at every operating point based on its capability charts [3][4]. A cost allocation for reactive power based on the P and Q relationship is proposed [5].…”

Section: Introductionmentioning

confidence: 99%

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Real and reactive power price of generators to load in pool based electricity market model

Kumar

2015

2015 International Conference on Energy Economics and Environment (ICEEE)

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In this paper, reactive power cost function has been obtained for generator to supply reactive power based on the operating point of the generators on its capability curve. Based on the reactive power cost functions, a non-linear optimization problem is solved to compute both real and reactive power prices for pool electricity market model considering the minimization of fuel and reactive power cost. A upstream looking algorithm has been used to find the contribution of each generator to the load and the based on proportional sharing the marginal prices at each node have been determined for both real and reactive power to be paid to generators. The results have been determined for IEEE 24 bus test system. The results have been compared for already reported methods to determine reactive power cost.

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Section: Capability Curve Of Synchronous Generatormentioning

confidence: 99%

Section: Capability Curve Of Synchronous Generatormentioning

confidence: 99%

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Real and reactive power price of generators to load in pool based electricity market model

Kumar

2015

2015 International Conference on Energy Economics and Environment (ICEEE)

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“…If a transducer fault persists for a prolonged period of time, overheating, due to large field currents, occurs. A persistent regulator fault increases armature end leakage flux and in turn causes overheating [14].…”

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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“…Also, such fluctuations could exceed the allowable generator voltage limits [28]. While a persistent transducer failure would also cause a system overheating because of high current, a persistent regulator failure may cause a leakage flux on the armature end causing overheating [29]. 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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Field Excitation in Relation to Machine and System Operation [includes discussion]

Cited by 19 publications

References 1 publication

Real and reactive power price of generators to load in pool based electricity market model

Real and reactive power price of generators to load in pool based electricity market model

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

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

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