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Advances in Power System Control, Operation and Management, 1991. APSCOM-91., 1991 International Conference on

Date 5-8 Nov 1991

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Displaying Results 1 - 25 of 159
  • Identification of hunting frequency and equivalent transmission line impedance in a multi-machine system for stability applications

    Publication Year: 1991, Page(s):81 - 85 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (88 KB)

    A generating unit in an interconnected power system often participates in both local and inter-area modes of oscillations. The spectral and temporal distributions of these modes are largely determined by the dynamics of the rest of the system. An adaptive stabilizer, capable of damping all modes of oscillation would require estimations of the dominant frequency of oscillation and the external equi... View full abstract»

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  • Graphic-assisted expert system for power system black restart

    Publication Year: 1991, Page(s):514 - 517 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Power system breakdown poses problems for power system planners and operators. The authors present an expert system which can assist the operators during system blackout, with an emphasis on the practical aspects of the problem. The structure and rules used in the expert system to aid the operators in making correct decisions are discussed. The authors also describe user friendly computer colour g... View full abstract»

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  • An expert system for tracking multiple load flow solutions associated with voltage instabilities

    Publication Year: 1991, Page(s):76 - 80 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Long distance transmission lines have to carry heavy load flows. The authors present an expert system for exactly obtaining target multiple load flow solutions for the present and forecasted loading conditions. The knowledge base is extracted from acquired know-how through the research study on multiple load flow solutions. The main objective of this expert system is to automatically provide targe... View full abstract»

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  • Optimal restoration of supply following a fault on large distribution systems

    Publication Year: 1991, Page(s):508 - 513 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    A computer aided optimal method has been developed for the restoration of electric supply to areas isolated from the network following a fault in a distribution system. A search technique is used where the search is guided by appropriate heuristics. The optimum solution entails finding the strategy which involves the operation of minimum number of switchgear for rerouting the supply within the con... View full abstract»

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  • Voltage collapse in electric power system

    Publication Year: 1991, Page(s):69 - 75 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    Some of the factors affecting the voltage stability of a electric power system are the loadings and transformer tap settings. In addition, different system parameters may also alter the proximity to the voltage collapse point. The authors present certain important observations on the voltage collapse phenomenon established through system studies on a sample EHV AC transmission network and a HVDC n... View full abstract»

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  • An expert system for procedure generation of power system restoration in regional control center

    Publication Year: 1991, Page(s):503 - 507 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    The restoration problem in power systems is considered to be suitable for applying an expert system and many papers have been published on expert systems for power system restoration. The authors present an expert system which automatically generates restoration procedures for a fault. The system is constructed with FREXS which is a domain shell for power systems. Therefore, execution speed is hig... View full abstract»

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  • Identification of parameters of Synchronous Machine and excitation system by online test

    Publication Year: 1991, Page(s):716 - 719 vol.2
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    A new method for estimation of parameters of a synchronous machine and excitation system presented. The method is based on online frequency domain (OLFD). The method is applied to the modelling of the synchronous machine and excitation system while the generator is operating. Power spectrum is used to analyse the transient process of the generator and excitation system. A dynamic fitting program d... View full abstract»

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  • Assessment and design of lightning shielding systems

    Publication Year: 1991, Page(s):791 - 796 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    A very sophisticated and yet user-friendly computer program has been developed for the performance assessment of lightning shielding systems (PALSS). The author describes the use of this program PALSS and demonstrates its usefulness. Examples of analysis and design on some typical structures are given. In particular, it is now noted that with taller structures, an aerial roof conductor system alon... View full abstract»

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  • Decentralized load-frequency control of interconnected power systems

    Publication Year: 1991, Page(s):815 - 820 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    The authors present a decentralized design method suitable for the load-frequency control of multi-area interconnected power systems. Model reduction techniques are incorporated into the design method. A four area interconnected power system is taken as an example to illustrate the method. Simulation results show the effectiveness of the proposed design method View full abstract»

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  • Financial management of capital development projects in the power utility business

    Publication Year: 1991, Page(s):56 - 62 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    The revolutionary changes in power utility operation, now taking place in a number of countries, are producing a major cultural change in the emphasis of their functional drive. As power utility businesses, they will be more closely measured in terms of their financial success than in the reliability and security parameters of the past. In this context, the author reviews budget forecasting, monit... View full abstract»

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  • Multivariable self-tuning control of a boiler-turbine system

    Publication Year: 1991, Page(s):498 - 502 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors present an application of a multivariable self-tuning controller to a 160 MW oil-fired drum boiler turbine system. The controller is based on multivariable generalised predictive control and is used to control three outputs: drum pressure, output power and drum water level. Weighting strategies between different loops have been discussed. Simulation studies, which include large changes... View full abstract»

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  • Electrical power industry; today and tomorrow

    Publication Year: 1991, Page(s):30 - 37 vol.1
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    The author presents the present status of power industry emphasizing on distribution, transmission, and generation. Presents the possible future expansions and developments in these areas. Emphasis is given on deregulation and automization of power industry, which would lead to a saving of 50% fuel cost, would improve the efficiency of overall power industry, and ultimately would result in a highl... View full abstract»

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  • Knowledge based system for transformer protection

    Publication Year: 1991, Page(s):443 - 448 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    Protection of power systems against the effects of faults, mainly short circuits, is a complex domain that involves the knowledge of several branches of power system engineering. The type of protection required for a particular plant depends not only on the characteristics of the plant itself like the type, size, ratings, etc, but also on the manner in which the plant is to be configured into the ... View full abstract»

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  • Control of electric thermal storage under real time pricing

    Publication Year: 1991, Page(s):397 - 403 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    Real time prising (RTP) is an electricity rate based on the actual time-varying costs of providing electric service. It changes with time as the costs of generation, transmission, and distribution change in time. RTP rate can contain both the short-term and long-term costs of electricity supply and revenue recovery requirements. As a complete demand-side management (DSM) option, RTP provides a mar... View full abstract»

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  • Expert system as industrial dispatchers' assistance

    Publication Year: 1991, Page(s):326 - 329 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    The authors deal with the problem of industrial process scheduling in case of failures in supply or technological system and limitation of maximum value of energy demand. Two approaches are presented: dynamic programming and expert systems approach. Experience resulting from the application of a dispatchers' assistance program in metallurgy is discussed. Progress in computer software and hardware ... View full abstract»

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  • Application of three-phase load flow to power system distribution automation

    Publication Year: 1991, Page(s):472 - 478 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The authors introduce three-phase distribution power flow in a rigid approach for large-scale distribution systems. The solution method is the optimally ordered triangular factorization YBus, Method (implicit ZBus Gauss Method). This method not only takes advantage of the sparsity of system equations but also has very good convergence characteristics from a distribution syste... View full abstract»

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  • Simulation of an induction generator connected to a simple system using 0dq transformation

    Publication Year: 1991, Page(s):709 - 715 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    An induction generator connected to an infinite bus through a grounded wye-grounded wye transformer, a transmission line, and with load and capacitance compensation, is studied using generator and system mathematical models in the stationary reference frame. Constraints for abnormal situations on the high voltage side of the transformer have been derived and the abnormalities have been simulated o... View full abstract»

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  • Computer analysis of transmission line insulation for lightning performance

    Publication Year: 1991, Page(s):780 - 790 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (664 KB)

    The authors describe a transmission line lightning performance analysis program, QCORTL, which is able to predict single and multi-circuit flashover and outage types and rates of a quadruple circuit transmission line. They employ the Monte-Carlo statistical technique to select lightning and system parameters from their probability distributions and the dynamic travelling wave technique to calculat... View full abstract»

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  • Bumpless migration of energy management system of China Light and Power Company

    Publication Year: 1991, Page(s):283 - 288 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    With the objective of adding state-of-the-art facilities to the energy management system (EMS), China Light and Power Company (CLP) of Hong Kong is replacing the existing system with a new EMS. In this new EMS, the computer processors are more powerful. Together with enhanced software it will achieve an overall improvement in system capacity and performance. The authors describes the technical con... View full abstract»

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  • Modal and eigenvalue sensitivity analyses of power oscillations in interconnected systems

    Publication Year: 1991, Page(s):808 - 814 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    Large interconnected power systems are often underdamped and if proper precautions are not taken power oscillations will occur. The basic concepts about their occurrence and the ameliorating measures have traditionally been derived from the single-machine infinite-bus model viewpoint which cannot unfortunately explain all the phenomena found in a more complex system. By means of modal and eigenval... View full abstract»

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  • Phase-comparison pilot relays using fault superimposed components

    Publication Year: 1991, Page(s):833 - 838 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    The performance of phase-comparison pilot relays using fault superimposed components of current under different conditions is analyzed. The results show that phase-comparison pilot relays using fault superimposed positive sequence current or phase currents are more sensitive and reliable then traditional relays using composite sequence current or phase currents, and the relays based on fault super... View full abstract»

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  • Toward business transformation: power system monitoring and control strategy for the 1990s

    Publication Year: 1991, Page(s):50 - 55 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    An ongoing challenge for the electric power industry is to transform the business of developing, operating and maintaining power transmission systems in a manner that increases productivity while also increasing quality of supply to customers. That is, to do more for the customer, but with fewer financial and human resources. Advances in computing technology provide an opportunity for the 1990s to... View full abstract»

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  • Stabilisation of multi-machine power systems by turbine governor control

    Publication Year: 1991, Page(s):493 - 497 vol.3
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors consider the application of power system stabilisers via the turbine governors of generating units in a multimachine power system. This arrangement is called a governor power system stabiliser (GPSS). The design is based on the principle of phase compensation and is easier than with conventional stabilisers. The authors present results of analysis and simulation of a three-machine syst... View full abstract»

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  • Organisation and management of the UK Electricity Supply Industry

    Publication Year: 1991, Page(s):21 - 29 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (648 KB)

    The author looks at the Electricity Supply Industry's progress from private to public, back to private ownership, consideration of the performance over the period and the possible trend in the future. He also covers the way in which the new pooling arrangements have operated and discusses applications of demand side management View full abstract»

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  • Expert system for the design of distribution networks

    Publication Year: 1991, Page(s):437 - 442 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    This paper is concerned with the design of the optimum conductor cross-section sizes for branched radial feeders and distributors (BRFs and BRDs) of a distribution system. The difference between a feeder and a distribution is that whereas the current loading of a branch of a feeder is the same throughout its length, the distributor has a distributed loading in its branch which results in variation... View full abstract»

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