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Computer Applications in Power, IEEE

Issue 2 • Date April 1993

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Displaying Results 1 - 8 of 8
  • Synchronized phasor measurements in power systems

    Publication Year: 1993 , Page(s): 10 - 15
    Cited by:  Papers (326)  |  Patents (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (646 KB)  

    The use of time synchronizing techniques, coupled with the computer-based measurement technique, to measure phasors and phase angle differences in real time is reviewed, and phasor measurement units are discussed. Many of the research projects concerned with applications of synchronized phasor measurements are described. These include measuring the frequency and magnitude of phasor, state estimation, instability prediction, adaptive relaying, and improved control.<> View full abstract»

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  • Integrated analysis software for grounding, EMF, and EMI

    Publication Year: 1993 , Page(s): 19 - 24
    Cited by:  Papers (43)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (579 KB)  

    The current distribution, electromagnetics, grounding, and soil structure analysis (CDEGS) software package for studying problems that involve power system electromagnetic fields (EMFs), electromagnetic interference (EMI), and grounding is described. This package includes three input processors, six engineering applications modules, and six output processors. The relationship between these modules and processors is illustrated. A case study of the inductive interference between a pipeline and a transmission line feeding a large industrial plant is investigated. The study also investigates the effects of potentials transferred by conduction from a distribution substation near the plant to the gas pipeline, and to other metallic structures. The case study illustrates the interrelationships among grounding, EMI, and EMF.<> View full abstract»

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  • Advanced graphics zoom in on operations

    Publication Year: 1993 , Page(s): 25 - 28
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB)  

    It is shown how advanced graphic facilities now available or under development may be used to provide dispatchers with better information for operating a power system. Power system operating functions were listed and prioritized in a joint NSF/EPRI research project, and several of those functions were selected on the basis of their potential benefit to power system operation. Graphics hardware and software facilities were studied, with consideration given to potential benefits to power system operation and the longevity of the hardware, software, and graphics standards. The hardware chosen for the demonstration was the DECstation 5000 reduced instruction set computer (RISC). The graphics programming facility is PHIGS 2.2a (Programmers Hierarchical Interactive Graphics Standard), and the programming language is C. The MIPS C compiler was used. A software package was developed to demonstrate the presentation of power system information to the dispatchers. The facilities included are the system map, transmission-line overload and contingencies, decluttering, voltage profile, alarm location, and system restoration.<> View full abstract»

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  • Applying AI systems in the T&D arena

    Publication Year: 1993 , Page(s): 29 - 34
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (611 KB)  

    Artificial intelligence (AI) techniques and applications that are being used to help solve transmission and distribution problems are highlighted. The authors focus on expert tasks in the power transmission and distribution areas that are suitable for applying AI methodologies. The following relevant AI methodologies are described: expert systems (ES), knowledge-based systems (KBS), and intelligent decision support systems (IDSS). Applications to fault location and diagnosis, distribution system planning, and underground residential distribution system design are discussed.<> View full abstract»

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  • The role of interfaces in supervisory systems

    Publication Year: 1993 , Page(s): 35 - 39
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (741 KB)  

    Some important considerations in the interface between a power system and remote terminal unit (RTU) are described. How the SCADA-RTU interfaces to control station equipment through interposing relays and to measuring circuits through transducers, meters, and other devices is explained. Distributed RTUs and intelligent electronic devices are discussed, and analog input interfaces are detailed. The use of digital input interfaces to monitor the state of power equipment is examined. Control output interfaces and a local user interface are discussed.<> View full abstract»

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  • Telemetering system supports load curtailment and billing

    Publication Year: 1993 , Page(s): 40 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    The use of computer systems designed to accommodate complex load management as well as billing and load survey programs by the Potomac Electric Power Company (PEPCO) and an innovative organizational approach to implement a comprehensive energy plan for its customers are described. The justification for purchasing a telemetering master station that supports load curtailment, automatic metering, customer billing programs, and load surveys is examined. These applications are discussed, and the telemetering system components are described.<> View full abstract»

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  • Evaluating soft strategies for clean-air compliance

    Publication Year: 1993 , Page(s): 46 - 50
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (511 KB)  

    The impact of the Clean Air Act on the Tennessee Valley Authority (TVA) is discussed and a Phase I system-wide compliance strategy is described. A pilot study was commissioned by the TVA to explore system operation issues. The purpose of the study was to simulate the actual system operation for 1 month, July 1995, a high-load month when the system will be required to operate under the new Phase I regulations. The software tool used in this analysis is the ABB Wescouger Emission Program. Data required for this study are discussed. Costs and benefits of emission dispatch are discussed, and the impact on pumped-storage utilization is described. Lastly, the transaction-pricing philosophy is discussed.<> View full abstract»

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  • ESWorkstations-the next generation

    Publication Year: 1993 , Page(s): 16 - 18
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (276 KB)  

    Integrated packages of computer programs that support specific electric utility engineering functions, known as electrical systems workstations (ESWorkstations), and their integration with utility-developed software are discussed. Various suggestions for making ESWorkstations more useful are examined. A built-in expert advisor, MENTOR, and the use of open systems architecture for workstations are discussed View full abstract»

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