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Operation on Unbalanced Voltage: One Motor's Experience and More
IEEE Transactions on Industry Applications, 2006Derating a motor for operation on an unbalanced voltage system is still much of a black art although National Electrical Manufacturers Association and International Electrotechnical Commission have generic derating charts for this application. Numerous papers have been written in an attempt to provide a theory for this operating mode and the losses ...
J.H. Dymond, N. Stranges
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Operations of Modern Roundabout with Unbalanced Approach Volumes
Transportation Research Record: Journal of the Transportation Research Board, 2011This research examined the operations of a four-legged, two-lane modern roundabout with different combinations of approach volumes. Because of the insufficient number of roundabouts to collect field data, experiments were performed with the VISSIM microscopic traffic simulation model.
Marilyn Valdez +2 more
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A-C servomotor operation from unbalanced voltages
Electrical Engineering, 1960MANY analytical studies directed at the predetermination of output characteristics of a-c servomotors have been predicated on the assumptions of constant source impedance and sinusoidal excitation. Under these assumptions, the method of symmetrical components serves admirably, particularly when steady-state characteristics are desired, and in cases ...
E. R. Lind, N. L. Schmitz
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Unbalanced Operations of AC Machines
IEEE Transactions on Power Apparatus and Systems, 1965In this paper, unbalanced operations of induction and synchronous machines are discussed. The current-voltage differential equations, referred to the moving reference axes ? and s, are derived directly from the general equations of armature reaction and induced voltage.
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Optimal Operation of Unbalanced Three-Phase Islanded Droop-Based Microgrids
IEEE Transactions on Smart Grid, 2019This paper presents a new mixed-integer nonlinear programming (MINLP) model for the optimal operation of unbalanced three-phase droop-based microgrids. The proposed MINLP model can be seen as an extension of an optimal power flow for microgrids operating
P. Vergara +3 more
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Protection of Induction Motors Against Unbalanced Voltage Operation
IEEE Transactions on Industry Applications, 1985The results are presented of a computer study to determine various operating quantities of squirrel-cage induction motors as a function of unbalanced voltage and mechanical loading utilizing a new analytical technique. A similar study with the extreme unbalance of single phasing was reported elsewhere.
Paul B. Cummings +2 more
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IEEE Transactions on Smart Grid, 2019
This paper proposes a multi-timescale operational approach for a three-phase unbalanced distribution system containing hourly scheduling at substation level and minutes power flow operation at feeder level.
Yi Gu +5 more
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This paper proposes a multi-timescale operational approach for a three-phase unbalanced distribution system containing hourly scheduling at substation level and minutes power flow operation at feeder level.
Yi Gu +5 more
semanticscholar +1 more source
Modeling of UPFC Operation under Unbalanced Conditions with Dynamic Phasors
IEEE Power Engineering Review, 2002The paper describes an analytical large-signal model for unbalanced operation of the unified power flow controller (UPFC). This nonlinear, time-invariant model is expressed in terms of dynamic symmetric components, and it is validated on a benchmark power system example taken from the literature.
P.C. Stefanov, A.M. Stankovic
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Operation of Grid-Connected DFIG Under Unbalanced Grid Voltage Condition
IEEE Transactions on Energy Conversion, 2009Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent during ...
Zhou, Y. (author) +3 more
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Analysis of distributed resources operating in unbalanced distribution circuits
2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134), 2002The use of distributed resource (DR) electrical generation in distribution circuits is growing. DR generation comes in many forms including gas turbine driven synchronous generators, wind powered induction generators, fuel cells with inverter circuitry, and others. This work focuses on the operation of DRs in unbalanced distribution circuits.
null Fangxing Li +3 more
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