skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Phase rotation as a means of augmenting transient stability

Abstract

As turbine generators become larger, their per-unit inertias decrease and their transient reactances increase. The result is reduced transient stability which must be augmented by supplementary techniques of transient stability enhancement. 120/sup 0/ phase rotation with immediate fast valving is shown to be a very effective means of augmenting transient stability when controlled by generator rotor angle. Variations, involving delay of fast valving or 360/sup 0/ phase rotation or multiple 120/sup 0/ phase rotation, are also studied. Comparisons, between these methods of augmenting transient stability, are made on the basis of transient stability enhancement and torsional shaft stress characteristics.

Publication Date:
Research Org.:
Purdue Univ., Lafayette, IN (USA)
OSTI Identifier:
7145296
Report Number(s):
DOE/ET/29365-9
ON: DE84010339
DOE Contract Number:
AC01-79ET29365
Resource Type:
Technical Report
Resource Relation:
Other Information: Paper copy only, copy does not permit microfiche production. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; ELECTRICAL TRANSIENTS; STABILITY; TURBOGENERATORS; AUGMENTATION; PHASE STABILITY; STRESS ANALYSIS; ELECTRIC GENERATORS; TRANSIENTS; VOLTAGE DROP; 200104* - Fossil-Fueled Power Plants- Components

Citation Formats

Not Available. Phase rotation as a means of augmenting transient stability. United States: N. p., 1980. Web.
Not Available. Phase rotation as a means of augmenting transient stability. United States.
Not Available. 1980. "Phase rotation as a means of augmenting transient stability". United States. doi:.
@article{osti_7145296,
title = {Phase rotation as a means of augmenting transient stability},
author = {Not Available},
abstractNote = {As turbine generators become larger, their per-unit inertias decrease and their transient reactances increase. The result is reduced transient stability which must be augmented by supplementary techniques of transient stability enhancement. 120/sup 0/ phase rotation with immediate fast valving is shown to be a very effective means of augmenting transient stability when controlled by generator rotor angle. Variations, involving delay of fast valving or 360/sup 0/ phase rotation or multiple 120/sup 0/ phase rotation, are also studied. Comparisons, between these methods of augmenting transient stability, are made on the basis of transient stability enhancement and torsional shaft stress characteristics.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1980,
month = 9
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share:
  • Power system operators and utilities worldwide have concerns about the impact of high-penetration wind and solar generation on electric grid reliability (EirGrid 2011b, Hydro-Quebec 2006, ERCOT 2010). The stability of North American grids under these conditions is a particular concern and possible impediment to reaching future renewable energy goals. Phase 3 of the Western Wind and Solar Integration Study (WWSIS-3) considers a 33% wind and solar annual energy penetration level that results in substantial changes to the characteristics of the bulk power system, including different power flow patterns, different commitment and dispatch of existing synchronous generation, and different dynamic behaviormore » of wind and solar generation. WWSIS-3 evaluates two specific aspects of fundamental frequency system stability: frequency response and transient stability.« less
  • Lumped mathematical models of the time-dependent behavior of two-phase natural circulation loops were used to predict their operation and to explain the unusual instabilities sometimes observed. The resulting transient behavior for the more complex models solved with the Univac computer were in close agreement with the experimental data from the University of Minnesota low-pressure loop. Closed unstable regions rather than limits were predicted, and the specification of stability in terms of one parameter was found to be impossible. The slip ratio and the nature of its variation was found to be critical in determining the predicted loop behavior. Comparison ofmore » oscillations at low and high pressure indicated that the frequency difference is due largely to system geometry. The criterion for the absence of oscillations was found to be similar to one of the criteria for stability of chemical reactors. (D.L.C.)« less
  • The extended transient-midterm stability package offers software for evaluating power system operations following major disturbances. This manual provides guidelines and input data descriptions for running three of the package's four primary programs.
  • The state-of-the-art of inertial micro-sensors (gyroscopes and accelerometers) has advanced to the point where they are displacing the more traditional sensors in many size, power, and/or cost-sensitive applications. A factor limiting the range of application of inertial micro-sensors has been their relatively poor bias stability. The incorporation of an integral sensitive axis rotation capability would enable bias mitigation through proven techniques such as indexing, and foster the use of inertial micro-sensors in more accuracy-sensitive applications. Fabricating the integral rotation mechanism in MEMS technology would minimize the penalties associated with incorporation of this capability, and preserve the inherent advantages of inertialmore » micro-sensors.« less
  • A muon spin rotation (..mu..SR) technique has been used to place limits on right-handed weak currents in ..mu../sup +/ decay. A beam of almost 100% polarized 'surface' muons obtained from the TRIUMF M13 beamline was stopped in essentially non-depolarizing >99.99% pure metal foils. The ..mu../sup +/ spins were precessed by 70-G or 110-G transverse fields. Decay e/sup +/ emitted within 225 mrad of the beam direction and with momenta above 46 MeV/c were momentum-analyzed to 0.2%. Comparison of the ..mu..SR signal amplitude with that expected for (V-A) decay yields an endpoint asymmetry xiP..mu..delta/rho>0.9951 with 90% confidence. In the context ofmore » manifest left-right symmetric models with massless neutrinos the results imply the 90% confidence limits M(W/sub 2/)>381 GeV/c/sup 2/ and -0.057« less