Operating characteristics of salient-pole machines

Walker, J.H.

doi:10.1049/pi-2.1953.0004

Cited by 19 publications

(10 citation statements)

References 1 publication

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“…The corresponding excitation systems allow regulating the machines' reactive power contributions within their P/Q capability limits. Figure 4.3 shows the basic steady-state P/Q capability chart of the cylindrical rotor and salient pole SM for nominal terminal voltage [8,72].…”

Section: Conventional Power Plantsmentioning

confidence: 99%

“…In the over-excited area, the same restrictions limit the capabilities of both machine types: The maximal field current (1) and the maximal armature current (2). As the terminal voltage increases, the maximal field current narrows the capability chart, while the maximal armature current widens it [72]. Figure 4.3a shows that the underexcited region of the cylindrical rotor machine is limited by the stator end-core heating (4).…”

Section: Conventional Power Plantsmentioning

confidence: 99%

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Volt/var Chain Process*

Schultis

Ilo

2021

A Holistic Solution for Smart Grids Based on LINK– Paradigm

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Simplicity is the ultimate sophistication.-Leonardo da Vinci IntroductionPhysically, the voltage is a local quantity that differs in each node of the electricity grid, as it varies along with the power transfer and the characteristics of the grid. Due to their strong coupling, the reactive power has always been used to control the voltage in transmission grids, originating the term Volt/varprocess. Reactive power is produced and consumed by diverse appliances distributed throughout the power system and operated by different stakeholders, making Volt/var control an extremely complex issue by its very nature. The overall control strategy should be designed with special care to reduce the complexity of the resulting Volt/var chain to facilitate the management.Volt/var management is one of the most fundamental power system processes that enables the reliable and efficient operation of the electricity grids. It is used to ensure compliance to voltage limits and to keep the power factor close to one. Both the elimination of voltage limit violations and the minimisation of the reactive power flows extend the active power transfer capability of the grid. In other words, an appropriate Volt/var control increases the utilisation of the electrical infrastructure, thus lowering the need for grid reinforcement.The massive connection of renewable and distributed generation and the electrification of other sectors gave rise to new challenges and opportunities that call for an adaption of the traditional Volt/var control schemes. Deteriorated power quality and uncontrolled interactions between the systems operated by different stakeholders are recognised as the main problems to be solved by future smart grids [66]. Meanwhile, the ability of distributed energy resources to participate in the Volt/var process

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Section: Conventional Power Plantsmentioning

confidence: 99%

Section: Conventional Power Plantsmentioning

confidence: 99%

Volt/var Chain Process*

Schultis

Ilo

2021

A Holistic Solution for Smart Grids Based on LINK– Paradigm

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“…Following operational constraints are the reasons for the limits in active and reactive power of the synchronous generator (Machowski, Bialek, and Bumby 2008 Figure 1. Capability diagram of synchronous generator (Walker 1953).…”

Section: Generator Capability Curvementioning

confidence: 99%

“…For round-rotor generators, theoretical stability limit is achieved at load angle δ =90°. However, the theoretical stability curve is reduced by a constant power value, for example by 10% of the rating of the machine as a safety margin and the corresponding curve so obtained is termed as practical stability margin (Walker 1953). The theoretical stability curve is drawn as a straight line at point (0,-…”

Section: Practical Stability Limitmentioning

confidence: 99%

Online Monitoring of a Synchronous Generator's Capability with MATLAB

Khadka¹,

Winkler²,

Øyvang³

2020

Linköping Electronic Conference Proceedings

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The future power systems are expected to operate closer to its security and stability limits mainly due to growth in variable renewable generation and the increase in load demand. In particular, voltage stability has been a major subject of discussion and concern in electric power system operation and planning worldwide. This evolution of the power system demands enhancement in ability from large synchronous generators to respond to change in demand and supply. In this contribution, a new visualization tool for online monitoring of a synchronous generator's capability is presented. In addition, the proposed tool is illustrated with a long-term voltage stability simulation carried out on a 10-bus benchmark power system. It is shown that the load models, load tap changing transformer and generator over-excitation limiter have a significant influence on voltage stability and collapse phenomena.

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“…These limits directly apply for round rotor units. However, the limits of salient pole generators can be closely approximated by (1) if , as suggested in [22]. The interested reader can refer to [22] for a more detailed description of salient pole generator limits:…”

Section: Reactive Power Reserve Sensitivitiesmentioning

confidence: 99%

An approach for real time voltage stability margin control via reactive power reserve sensitivities

Leonardi

Ajjarapu

2013

IEEE Trans. Power Syst.

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This study proposes a man-in-loop control method to boost reactive power reserves (RPRs) while maintaining a minimum amount of voltage stability margin (VSM) bus voltage limits. The objective is to determine the most effective control actions in order to reestablish critical RPRs across the system. Initially, the concept of reactive power reserve sensitivity with respect to control actions is introduced. In the sequel, a control approach based on convex quadratic optimization is used to find the minimal amount of control necessary to increase RPRs above their pre-specified (offline) levels. Voltage stability margin constraints are incorporated using a linear approximation of critical RPRs.Simulation results show that system operators can optimally determine the right amount and location of control actions in order to restore critical RPRs and enhance VSM by using reactive power reserve sensitivities. Moreover, the optimization problem size can be made small if only the most effective control actions are selected, a desirable advantage for real time implementations of man-in-loop control.Index Terms-Emergency control, reactive power reserves, reactive power reserve sensitivity, voltage collapse, voltage stability control.

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Operating characteristics of salient-pole machines

Cited by 19 publications

References 1 publication

Volt/var Chain Process*

Volt/var Chain Process*

Online Monitoring of a Synchronous Generator's Capability with MATLAB

An approach for real time voltage stability margin control via reactive power reserve sensitivities

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