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Computer Applications in Power, IEEE

Issue 4 • Date Oct. 1997

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Displaying Results 1 - 11 of 11
  • Guest Editorial

    Page(s): 10 - 12
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    Freely Available from IEEE
  • IEEE Computer Applications in Power Vol. 10 [1997 Index]

    Page(s): 75 - 80
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    Freely Available from IEEE
  • Wide-area protection against voltage collapse

    Page(s): 30 - 35
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    A wide-area protection system against long-term voltage collapse was designed, implemented, tested, modified, and commissioned. The system is based on the present SCADA system in southern Sweden, which has been complemented with input signals and equipment to execute action orders from the protection system. Bus voltages from the transmission system, reactive power output from generators connected to the transmission system, and current limiter information from main generators were used as input signals to the wide-area protection system. Actions from the protection system are shunt reactor disconnection, shunt capacitor connection, start of gas turbines, emergency power request from the HVDC connection to Germany, low priority load disconnection, and finally shedding of high priority load View full abstract»

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  • Information superhighway [online scientific publishing]

    Page(s): 14, 16, 18 - 19
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    Despite the growing popularity of the World-Wide Web, few traditional publishers have been willing to venture putting their intellectual property online. In part, this has been a result of a misunderstanding of this new publishing medium, and its implications for traditional print (which stems from the modernist fear of undercutting profits). It also stems from a lack of resolution to many of the copyright issues as they relate to the digital world, especially with regard to “fair use”. Nevertheless, the Web is a powerful communications medium that was pioneered by the science and engineering communities. This paper describes how, as a member of that community, National Academy Press feels a moral obligation to meet the needs of scientists and engineers for nearly instantaneous access to critical information that may bear directly on fundamental research and policy questions View full abstract»

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  • Grids get smart protection and control

    Page(s): 40 - 44
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    As open transmission access is becoming a reality, a major concern of electric power utilities is to maintain the reliability of the grid. Increased power transfers raise concerns about steady-state overloads, increased risks of voltage collapse and potential stability problems. Strengthening the protection and control strategies is what utilities must do to prevent a local problem from spreading to other parts of the grid. This article defines the framework and motivation for the development of a multilayered protection and control scheme that starts with local measurement devices and integrates higher-level control schemes into an overall control strategy View full abstract»

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  • Intelligent system applications to power systems

    Page(s): 21 - 22, 24
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    The authors describe how the use of intelligent systems (IS) is an opportunity to add new dimensions to the field of computer applications in power systems. A number of practical power system problems require logic reasoning, heuristic search, perception, and/or the ability to handle uncertainties; IS tools can be part of their solution. The authors describe how AI-related application areas, such as expert systems, fuzzy logic, neural networks and genetic algorithms, can all be applied in such intelligent systems View full abstract»

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  • Hydro automation takes coordinated control

    Page(s): 26 - 29
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    This article describes a practical and economical approach that was recently used in the West Side Hydro Automation Project at Enron Portland General Electric (USA). That project involved the upgraded automation for remote control of hydropower plants along three rivers in northwest Oregon. Innovative and practical approaches were used to obtain the best possible results with least cost and with least dependence on proprietary system elements. Also, a major objective was to have a speedy process for the planning and implementation of the project View full abstract»

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  • ISO 9000 prescribes a framework for quality

    Page(s): 45 - 49
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    All over the world, electrotechnical companies are facing increasing competition in the marketplace. The key to success is higher quality products and services, and many companies are adopting the ISO 9000 series of international quality standards. In the electronics and power industries, suppliers such as Philips, IBM, Siemens, ABB and HP have already implemented the standards in most of their development sites. Recently, the Electric Power Research Institute (EPRI) notified its software development contractors that ISO 9000 certification will provide them with a substantial competitive edge in winning new contracts. This article describes how ISO 9000 software processes were implemented at the Cadence India Engineering Center and defines the benefits gained by the company from the perspectives of its management, employees and customers. Benefits of well-defined processes in term of quality and cycle-time are very apparent and process maturity is a key to achieving positive cultural change View full abstract»

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  • Optimized relay testing systems

    Page(s): 55 - 59
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    With the appearance on the market of electronic test equipment that is controlled by software from personal computers, automation of classical test methods has been achieved and new methods have been developed. For engineers and technicians in charge of performing integrity and application tests, steady-state and dynamic tests can provide helpful information used in design, commissioning and preventive and corrective maintenance. These test methods result in savings of time and the cost involved in these tasks. Since 1990, the Spanish electric utility, Iberdrola, and the Electrical Department of the University of the Basque Country have been developing tools to: automate protective relay testing; analyze the location and characteristics of faults in the power network on the basis of oscillographic records; and simulate real or hypothetical fault conditions on a protective relay in order to monitor its behavior. Two automatic relay testing systems and experience of their use are introduced in this article. Particular testing protocols of different relays are incorporated and all useful features available to increase the automation grade are considered. Both systems minimize power system protection relay maintenance times and costs and improve the quality and reliability of relay management View full abstract»

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  • Line-rating system boosts economical energy transfer

    Page(s): 36 - 39
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    The authors describe how the Korea Electric Power Corporation (KEPCO) has successfully completed twenty-four overhead transmission line upgrade projects in Korea from 1994 to 1997 for a total cost of US$54.6 million. Upgrades to existing transmission lines were accomplished by replacing existing conductors with high ampacity conductors using existing towers and rights-of-way. Transmission line capacity is doubled with these high-capacity conductors. Planning studies and construction of the upgrade projects were facilitated by using LINEAMPS transmission line ampacity software View full abstract»

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  • Keeping an eye on power system dynamics

    Page(s): 50 - 54
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    The authors describe how the Bonneville Power Authority (USA) began to develop integrated monitoring and analysis tools to meet the need for accurate and coordinated dynamic power system information in 1990. They detail how the Dynamic Information Technology Package (DITPak) has evolved and how it now includes virtual instrumentation using LabVIEW software, modular and readily networked measurement hardware, streamlined analysis software in a MATLAB working environment and optional use of familiar workstation tools for display and report generation View full abstract»

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