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1991 Third International Conference on Power System Monitoring and Control

26-28 Jun 1991

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Displaying Results 1 - 25 of 65
  • Optimal design of measurement points for power system state estimation

    Publication Year: 1991, Page(s):267 - 269
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    Power system state estimation is the process of estimating, from real time measurement data, the network power flows and busbar voltages. The authors analyse the relation between the total variance of state estimation errors and the locations of measurement points, and the parameters of the network. It is found that the total variance of the state estimation errors differ significantly when the sa... View full abstract»

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  • Prediction models for the incremental cost and the water worth functions based on hydro-thermal OPF

    Publication Year: 1991, Page(s):264 - 266
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    A hydro-thermal electric power system is considered. The object is to find the active power generation schedule to meet a predicted active and reactive power demand profile and simultaneously achieve maximum economy. The scheduling is planned for an appropriate time interval. The problem is commonly known as the hydro-thermal optimal power flow View full abstract»

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  • A parallel computation of state estimation by transputer [poor systems]

    Publication Year: 1991, Page(s):261 - 263
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    It is important for the secure operation of a power system to grasp its operating conditions on-line. The authors develop a parallel state estimation program using an MIMD computer which consists of four transputers and apply it to the test systems. The key idea of the proposed method is that the gain matrix is transformed into a bordered block diagonal matrix by using a network partitioning proce... View full abstract»

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  • Upgrading Ireland's National Control Centre

    Publication Year: 1991, Page(s):198 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors describe the control system which is in operation in the National Control Centre, Ireland. Its limitations, together with the other reasons which prompted the upgrade are described. The underlying reasons for the Electricity Supply Board's commitment to a distributed computing architecture in order to avoid the hardware constraints experienced with the original system are outlined. The... View full abstract»

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  • Power transfer control and generation rescheduling in emergencies

    Publication Year: 1991, Page(s):258 - 260
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A method of emergency control which considers load-shedding and overload control is proposed. The inclusion of frequency falls occurring simultaneously with overloads is used for the analysis. System overload concept is used for computer definition of generation rescheduling and interarea power transfers. Results of simulation in a small sample system show good response in interarea power transfer... View full abstract»

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  • The design and implementation of Ontario Hydro's new energy management system

    Publication Year: 1991, Page(s):192 - 197
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The responsibility for the integrated operation of Ontario Hydro's Bulk Electric System (BES) rests with the System Control Centre (SCC). In 1985, because of concerns relating to equipment obsolescence, space restrictions and site security, Ontario Hydro decided to build a new SCC located in Clarkson some 30 km west of Toronto. It became operational on schedule in December 1990. The author provide... View full abstract»

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  • The determination of the cost savings in economic dispatch calculations by improving the accuracy of the input data

    Publication Year: 1991, Page(s):255 - 257
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

    The economic dispatch problem is considered. In online applications, the optimality of the results obtained from these economic dispatch calculations depends on the inaccuracies of the input data, e.g. on the inaccuracies of the incremental cost curves, of the line impedances, of the transformer turns ratios, etc. A proposal is made for the determination of the cost savings when the accuracy of th... View full abstract»

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  • An advanced system for energy management in Helsinki

    Publication Year: 1991, Page(s):186 - 191
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    The authors describe the philosophy and implementation of managing the electric and district heating energy supply in Helsinki. The structure of the networks and their interdependence is described as well as the control strategy, handled by a central control system and separate district centres for the electric and district heating networks. The authors emphasise the main control centre with its c... View full abstract»

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  • Towards a more comprehensive approach to hydro-thermal power system scheduling by Lagrangian relaxation

    Publication Year: 1991, Page(s):252 - 254
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    It has been shown that a practically sized hydro-thermal power system, such as the Scottish system can be modelled comprehensively, and the associated short-term scheduling problem solved within reasonable time-scales, using Lagrangian relaxation techniques. This method allows the hydro-thermal scheduling problem to be split into the separate scheduling of individual thermal units and hydro-system... View full abstract»

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  • Microprocessors in substation control

    Publication Year: 1991, Page(s):28 - 33
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    As part of the management of the National Grid, the Information Technology Department of National Grid (NGC-IT) is developing a suite of systems to enable National Grid substations to be brought under microprocessor control. The authors examine developments in three major control areas, automatic voltage control (AVC), automatic reactive switching (ARS) and computerised auto-switching (CAS), in so... View full abstract»

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  • Planning installation and operation of a hydro-generation control centre

    Publication Year: 1991, Page(s):180 - 185
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    Scottish Hydro Electric PLC is responsible for the generation, transmission and distribution of electricity over an area of 55167 square kilometres situated north and west of a line from the Firth of Tay to the Firth of Clyde. 55 hydroelectric stations are located throughout this area and 47 of the major stations are operated and administered from two control centres situated north and south of th... View full abstract»

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  • Specification of high resolution graphics man/machine interface for British Rail's electric traction power supply network SCADA systems

    Publication Year: 1991, Page(s):86 - 91
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    Control of electric traction power supply networks associated with electrified railways has been a requirement in Britain since the turn of this century. The first electrification schemes lacked remote control facilities, each large sub-station site being manned. The author looks at the gradual introduction of high resolution graphics man/machine interfaces in the control rooms with SCADA systems.... View full abstract»

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  • Requirements for a load forecasting system in the privatised supply industry

    Publication Year: 1991, Page(s):247 - 251
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The authors define the functions which are supported in an electrical load forecasting system. They show how existing algorithms and techniques have been integrated into a comprehensive product, which includes a supporting database and graphics-based human computer interface. This product is aimed at the specific needs of the industry and may be regarded as a first step towards a total energy mana... View full abstract»

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  • Implementation of a low cost rural telecontrol and monitoring system

    Publication Year: 1991, Page(s):22 - 28
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    The village of Sevenoaks Weald in Kent lies to the south of the major town of Sevenoaks supplied by a long overhead line feeder. The long feeder has a history of problems and Seeboard was concerned to improve the performance of the supply network for the customers in the village. Air break isolating switches are to be used on the line and the authors look at a prototype communication and control s... View full abstract»

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  • Fuzzy coordination of economy, security and quality in power system generation control

    Publication Year: 1991, Page(s):174 - 179
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    In the operation of power systems it has become necessary not only to consider pursuit of economy but also to take various other requirements into consideration. In order to do away with the shortcomings of conventional approaches, a technique determining the optimal operation states has been proposed, whereby operating problems involving plural objectives are formulated as multi-objective program... View full abstract»

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  • Distribution management system-implementation of an integrated approach

    Publication Year: 1991, Page(s):80 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    Southern Electric, in conjunction with Westinghouse Systems Ltd, has commenced the development of a distribution management system. This joint project, known as COMAND, Control Management and Network Display system, draws on the user skills and specialist knowledge of Southern Electric and combines it with the real-time systems expertise of WSL to produce an optimum solution to a computer-based co... View full abstract»

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  • A method to monitor transient security in optimal power dispatch

    Publication Year: 1991, Page(s):244 - 246
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    A method to include on-line dynamic security assessment in optimum dispatch operation of power system is presented. This methodology possesses a number of innovative features. First, the formulation extends the conventional static security constrained OPF programs to include consideration of the dynamic security level of the on-line states. A dynamic security monitor and a preventive control modul... View full abstract»

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  • Integrated substation measurement, data acquisition and communications

    Publication Year: 1991, Page(s):16 - 21
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    An integrated system providing the features of both expanded measurement and data capture coupled with local processing can be of significant benefit to the utility. This type of integrated system is a cost-effective means of providing enhanced data flow within the utility, allowing utility personnel to obtain a detailed profile of the distribution system and to implement cost-saving procedures. T... View full abstract»

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  • Implementation of state estimator and security assessor software on the Scottish hydro-electric 275 kV system

    Publication Year: 1991, Page(s):168 - 173
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors describe the initial test results of the implementation of state estimator and security assessor software on the Scottish hydro-electric 275 kV system. A brief outline of the underlying theory of the state estimator and security assessor is given, and online test results from the state estimator, including bad data replacement, and security assessor are presented. The background associ... View full abstract»

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  • Innovative aspects of ESB's distribution SCADA scheme

    Publication Year: 1991, Page(s):74 - 79
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The Electricity Supply Board (ESB), Ireland, is the statutory body entrusted with the generation, transmission, distribution and sale of electricity within the Republic of Ireland. The authors provide a brief description of ESB's distribution SCADA project with an emphasis on some of its more unusual aspects View full abstract»

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  • Dispatch of spinning reserve

    Publication Year: 1991, Page(s):241 - 243
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (120 KB)

    Maintaining system frequency within operational and statutory limits following generation infeed losses requires sufficient active power reserves. An enhanced dispatch algorithm is presented in which generator loading and operating pressure are instructed to provide spinning reserve in the most economical way. A power system simulation is also presented to illustrate the benefits of adopting such ... View full abstract»

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  • A fuzzy logic based self-tuned power system stabilizer

    Publication Year: 1991, Page(s):146 - 151
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    The application of a self-tuned fuzzy controller as a power system stabilizer is introduced. The output stabilizing signal from the controller is computed using a standard fuzzy membership function as well as a self tuning parameter. The calculation is based on the representation of the alternator state in the phase plane. Simulation results have been performed for various operating conditions und... View full abstract»

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  • Integrated substation control and protection-a co-ordinated protection approach

    Publication Year: 1991, Page(s):10 - 15
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    A new generation of protection schemes for application to the Eskom electrical network is currently being introduced into the organization. The new protection schemes focus on two key aspects, namely a technological move to the use of microprocessor-based equipment, and an approach which facilitates the co-ordination of the protection with an integrated control system. The author describes Eskom's... View full abstract»

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  • Low-cost under-frequency relay for distributed load shedding

    Publication Year: 1991, Page(s):273 - 275
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (148 KB)

    An under-frequency load shedding relay utilizing a single-chip microcomputer is described. The device may be used to shed off-peak load, thus replacing expensive emergency reserve over the corresponding periods. Economic analysis shows that the device is cost-effective when controlling loads with an installed capacity greater than about 20 kW. Use of an existing contactor, associated with a radio ... View full abstract»

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  • An advanced package for management of distribution system operations

    Publication Year: 1991, Page(s):210 - 212
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    The authors provide an overview of an operations management system by Westinghouse Systems Limited for the power distribution industry. System requirements together with the main features of design and the aspects of system software pertinent to the operation of distribution networks are covered View full abstract»

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