By Topic

IEEE Computer Applications in Power

Issue 4 • Date Oct. 1993

Filter Results

Displaying Results 1 - 8 of 8
  • Adaptive out-of-step relaying using phasor measurement techniques

    Publication Year: 1993, Page(s):12 - 17
    Cited by:  Papers (40)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Adaptive relaying proposes to provide protection functions that will adapt to changing power system conditions. The adaptive out-of-step relay presented recognizes power system changes and uses a modified system impedance matrix to change relay settings. An investigation of a Florida-Georgia 500 kV interconnection initially, used a simple two-machine mode to represent the interconnection. After th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time-domain simulation investigates voltage collapse

    Publication Year: 1993, Page(s):18 - 22
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (470 KB)

    Fast and slow power system dynamic performance is illustrated with two examples from actual electric utility systems. These examples were chosen to characterize a local reactive power shortage and radial system performance, respectively. In both cases, a critical disturbance is examined. These disturbances result in a load flow that cannot be solved. Studies were performed with the Extended Term D... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Extended-term dynamic simulation using variable time step integration

    Publication Year: 1993, Page(s):23 - 28
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (551 KB)

    The application of the Extended Time Scale Stability Analysis program (EXSTAB) is illustrated. The program was developed for the numerical simulation of power system phenomena spanning time periods from several seconds to several hours and involving slow events, such as load cycles, as well as fast transients, such as line trips. The integration algorithm in this problem automatically reduces the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital bus-zone protection

    Publication Year: 1993, Page(s):29 - 34
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    A numerical bus-zone protection scheme that overcomes the drawbacks of analog units was designed and constructed. Both high- and low-impedance measurement schemes for us protection relays were investigated. For the numerical bus protection designed, low impedance measurement schemes are used. The basic hardware structure used in the digital bus-zone protection scheme and two modes of realizing bre... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Unit commitment application builds up existing EMS

    Publication Year: 1993, Page(s):35 - 39
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB)

    The unit commitment system (UCS), an integrated set of hardware and software components connected to Northern States Power Company's (NSP's) existing energy management system (EMS) via a hyperchannel network, is described. The objective of the UCS is to provide functional capabilities for the user to study and and economically schedule system resources (generation and transactions) in conjunction ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Project planning for EMS and SCADA systems

    Publication Year: 1993, Page(s):40 - 45
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (650 KB)

    A typical supervisory control and data acquisition (SCADA) system or an energy management system (EMS) has an installed life of only 10 to 15 years. Because it can take five years or more to implement a new EMS or SCADA system, managing such projects is becoming a way of life for utilities. Project planning for EMS and SCADA systems is described. A preliminary project schedule that encompasses thr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flexible transient stability software features user-defined models

    Publication Year: 1993, Page(s):46 - 51
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (558 KB)

    The authors focus on CYMSTAB-UDM, a transient stability program that was designed to circumvent the restrictions associated with library-based simulation tools. Equipment libraries were kept available to the program, while at the same time allowing the user to carry out simulations using novel control strategies. Principles of implementation and the user interface of this approach are briefly desc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Software predicts harmonic problems and simulates alternative solutions

    Publication Year: 1993, Page(s):52 - 57
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    HI WAVE is a harmonic analysis program that predicts harmonic distortion levels through detailed power system simulation before they occur. In order to predict the harmonic distortion level in a power system, each system element must be modeled as a frequency dependent component. Recommendations for power system element modeling and network modeling are presented. These elements include harmonic s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.