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IEEE Power Engineering Review

Issue 5 • Date May 2000

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Displaying Results 1 - 17 of 17
  • Superconducting magnetic energy storage

    Publication Year: 2000, Page(s):16 - 20
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    Superconducting magnetic energy storage (SMES) is an energy storage technology that stores energy in the form of DC electricity that is the source of a DC magnetic field. The conductor for carrying the current operates at cryogenic temperatures where it is a superconductor and thus has virtually no resistive losses as it produces the magnetic field. The overall technology of cryogenics and superco... View full abstract»

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  • 2000 summer meeting preview

    Publication Year: 2000, Page(s):28 - 34
    Request permission for commercial reuse | PDF file iconPDF (665 KB)
    Freely Available from IEEE
  • Triangular distribution load flow

    Publication Year: 2000, Page(s):60 - 62
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    This letter presents the results of an investigation concerning the load-flow solution of radial distribution networks. The special topology (i.e., the triangular structure) of distribution load-flow equations is investigated and exploited to develop a simple and direct solution technique View full abstract»

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  • Superconducting power generation

    Publication Year: 2000, Page(s):8 - 11
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    With respect to the electric power industry, the superconducting AC generator has the greatest potential for large-scale commercial application of superconductivity. Such a machine should be able to convert mechanical energy to electric energy more efficiently and with greater economy of weight and volume than any other method. These advantages can be accrued at a scale of 1200 MVA output, with th... View full abstract»

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  • Frequency-dependent simple harmonic model of synchronous machines

    Publication Year: 2000, Page(s):58 - 60
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    In this letter, a detailed harmonic model of synchronous machines is established based on previous work by X.P. Yhang (1995) and X.P. Yhang et al. (1999). Then a frequency-dependent simple harmonic model (FSHM) of synchronous machines is derived directly from this detailed Park equation-based synchronous machine model. Finally the connections and differences between this FSHM and widely used simpl... View full abstract»

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  • On a hysteresis model for transient analysis

    Publication Year: 2000, Page(s):53 - 55
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The letter describes an approach to a representation of transient behavior due to switching off complex nonlinear circuits. For this purpose the widely known Jiles model (JM) was implemented into the Alternative-Transient-Program (ATP). Calculations have been made on simplified transformer single-phase and three-phase circuits View full abstract»

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  • Applications of superconductivity to electric power systems

    Publication Year: 2000, Page(s):4 - 7
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The interest in superconducting systems stems from their promise to be more efficient, smaller, and lighter than those made from conventional conductors. The types of applications in which superconductivity has the potential to be effective in an electric power system can be separated into two general classes. The first type includes those technologies in which superconductivity is simply a replac... View full abstract»

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  • Calculation of optimum directional overcurrent relays settings: the parallel lines case

    Publication Year: 2000, Page(s):68 - 69
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A simple and practical criterion is proposed to consider the transient changes due to nonsimultaneous operation of directional overcurrent relays in parallel lines. The criterion consists of using two different time coordination intervals: one for relay coordination pairs that do not belong to parallel lines and another for pairs belonging to parallel lines. The method can be implemented in progra... View full abstract»

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  • Power systems of the future. 3

    Publication Year: 2000, Page(s):21 - 24
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    For pt.2 see ibid., vol.20, no.3, p.10-29 (2000). The assets and working philosophy of individual electric utilities will in large measure be reflected by the modernization of their power systems during the next 20 years. This part looks at the potential for fault current limiters, lightning and restoration preparedness, and advanced delivery technologies (compressed-gas-insulated delivery, evapor... View full abstract»

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  • Identifying a vanishing eigenvalue in voltage collapse analysis with limits consideration

    Publication Year: 2000, Page(s):76 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    Modal analysis has been widely employed in voltage stability studies. The literature shows that monitoring the least eigenvalue/singular value as a function of load increase may drive one to draw the wrong conclusions, since these indices present a sharp variation at the bifurcation point. This letter shows that a “well-behaved” eigenvalue may be identified, even when reactive power li... View full abstract»

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  • Optimal active OPF with FACTS devices by an innovative load-equivalent approach

    Publication Year: 2000, Page(s):63 - 66
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    In this letter, a load-equivalent model suitable for FACTS devices is proposed for use in optimal active power flow computations. Specified power value or voltage-dependent loads can represent a FACTS device. The power flow of the power system including FACTS devices can be solved with slight modification of the conventional power flow program to include the effects of the introduced equivalent lo... View full abstract»

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  • Development status of superconducting motors

    Publication Year: 2000, Page(s):12 - 15
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The article gives a brief history of the development of superconducting motors with emphasis on the use of high temperature superconductors. At present, effort is directed toward the demonstration of a 1000 hp HTS motor, the test of which will mark another significant milestone in HTS motor development. For the first time, a closed-loop refrigeration system will be used to maintain an operating te... View full abstract»

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  • Novel energy-based Lyapunov function for controlled power systems

    Publication Year: 2000, Page(s):55 - 57
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    This letter first derives the Hamiltonian equation for a power system with excitation control. A modified energy-based Lyapunov function is then presented for fast transient stability analysis of the controlled power systems View full abstract»

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  • Method of reducing the effect of supply unbalance on induction motors

    Publication Year: 2000, Page(s):70 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    The operation of induction motors under unbalanced supply conditions is well documented. Because of the resulting unbalanced currents, there is an increase in losses and consequent overheating of the windings. IEC Standard 34-1-1996 and NEMA Standard MG-1-1993 stipulate that a motor should be able to withstand continuous operation with 1% negative sequence voltage without derating. Where motors ar... View full abstract»

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  • Effect of distribution system protection on voltage sags

    Publication Year: 2000, Page(s):66 - 68
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The general relationship between distribution system protection schemes and voltage sags is presented. The definition, characteristics, and sources of sags are given. The probability of sag occurrence is studied from the three points of view: reliability assessment, historic reliability, and general tendency. General values for the reliability assessment uncertainties and facts related to the hist... View full abstract»

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  • A novel technique for measuring grounding capacitance and grounding fault resistance in ineffectively grounded systems

    Publication Year: 2000, Page(s):72 - 73
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    A principle for resonance measurement based on injecting a resonant frequency signal is presented in this letter. Using this principle, the grounding capacitance of lines and equipment and the grounding fault resistance can be measured on-line in ineffectively grounded systems. Based on this, Petersen-coil automatic tuning is implemented and 100% stator grounding fault protection for generator sta... View full abstract»

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  • Nonlinear optimal power flow with intertemporal constraints

    Publication Year: 2000, Page(s):74 - 75
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    This letter describes an interior point dynamic optimal power flow (OPF) algorithm and illustrates its application to a model network that includes large energy-intensive consumers such as metal smelters that are able to reschedule demand to reduce electricity cost subject to meeting the day's production quota. Although the behavior predicted by the algorithm is no surprise (those consumers whose ... View full abstract»

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