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

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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  • Accurate fault location technique for multi-terminal EHV lines

    Publication Year: 1991, Page(s):420 - 424 vol.1
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Teed feeders offer considerable benefits over two-terminal lines for EHV transmission purposes. Conventional approaches-solve such type of problem is not very easy. The authors outline the basis of the fault locator on a teed feeder. Results show high degree of accuracy attained in fault location for untransposed lines under various system and fault conditions in practical 400 kV applications View full abstract»

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  • UHF partial discharge monitoring of 400 kV GIS at Castle Peak substation

    Publication Year: 1991, Page(s):415 - 419 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    China Light and Power Co. Ltd., have embarked upon a trial installation of partial discharge (PD) measurement in gas insulated switchgear (GIS) using an ultra high frequency (UHF) detection technique. The system has been evaluated at a major 400 kV GIS installation at the Castle Peak power station site. The use of this technique is being considered by the Transmission Department as part of a diagn... 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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  • Operating experience of SF6 gas-filled power transformers

    Publication Year: 1991, Page(s):410 - 414 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The Hong Kong Electric Co. Ltd. (HEC) is supplying electricity to the Hong Kong and Lamma Islands. Many of the transmission and distribution plants and equipment are located near the vicinity of high rise commercial and domestic buildings which are very densely populated. Therefore it is very important to reduce the potential fire hazard due to electrical plants and equipment to a minimum. The use... 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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  • 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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  • Fuzzy dynamic load dispatching

    Publication Year: 1991, Page(s):311 - 315 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    A new planning technique, fuzzy dynamic load dispatching is presented. The proposed approach features the capacity for dealing with several fuzzy parameters, such as forecasted loads and system security, which reflect the significant experiences of operators. In order to obtain an optimal load dispatching strategy under a fuzzy environment, a fuzzy dynamic programming model based on the fuzzy set ... View full abstract»

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  • Operational experience of transmission oil filled and XLPE cables

    Publication Year: 1991, Page(s):404 - 409 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    The Hong Kong Electric Co. Ltd. has only one power station at Lamma Island with a generation capacity of about 2200 MW. More than ninety percent of the transmission capacity is carried by oil-filled cables at voltage level of 275 kV and 132 kV. The author outlines the general transmission network configuration, operational difficulties encountered with the present oil-filled cable system and syste... View full abstract»

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  • Damping of power system oscillation by active power and reactive power modulation SMES unit

    Publication Year: 1991, Page(s):797 - 801 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    An active power and reactive power (P-Q) simultaneous control scheme of superconducting magnetic energy storage (SMES) unit is designed to damp out the low frequency oscillation of power system. In order to increase the damping of the turbogenerator, a proportional-integral (PI) controller is used to modulate the active power and reactive power input/output of the SMES unit according to the speed ... View full abstract»

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  • System studies and basic design for an advanced series compensation scheme (ASC)

    Publication Year: 1991, Page(s):123 - 128 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    A new innovative advanced series compensation (ASC) scheme will be supplied by Siemens for installation in the 230 kV Kayenta substation by the Western Area Power Administration USA (WAPA) in early 1992. This scheme includes thyristor controlled reactors in parallel with a three-phase capacitor bank, which represents significant progress in terms of flexible AC transmission systems (FACTS). The au... 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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  • Application and development of fibre optics in China Light & Power Company Limited

    Publication Year: 1991, Page(s):650 - 655 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    The provision of reliable, adequate and high quality inter and intra station communication links is of vital importance to the successful operation of an electric utility. With the continual expansion of the China Light & Power (CLP) electricity supply system and the ever-increasing demand in high speed communication links for the Company's business applications, the in-house communication net... View full abstract»

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  • Advanced maintenance information systems for overhead power transmission lines

    Publication Year: 1991, Page(s):927 - 932 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    An advanced maintenance information system for overhead power transmission lines has been developed and introduced into actual transmission lines. The system provides various useful information for transmission line maintenance work, such as fault sections if a fault occurs, meteorological conditions and power conductor temperature etc. In addition to the basic maintenance information, the system ... View full abstract»

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  • Emergency control schemes for securing the South-East Australian power system

    Publication Year: 1991, Page(s):289 - 294 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    In 1990 the South Australian power system (1.8 GW) was connected to the interconnected New South Wales-Victorian power system (15.5 GW). The interconnection was designed on an opportunity interchange basis for power transfer levels of 500 MW into South Australia and 250 MW out of South Australia. The extensive use of double circuit transmission to minimise costs required that high speed automatic ... View full abstract»

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  • Small oscillator stability of a synchronous machine

    Publication Year: 1991, Page(s):485 - 492 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The ever-increasing demand for power and the corresponding greater complexity of power systems is leading to more severe problems of system stability, for instance a hydro-driven generator supplying power to a load via a long transmission line. The effect of high line resistance may result in electromechanical oscillations or hunting of generator rotors which could lead to abnormal stresses in and... View full abstract»

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  • A new power swing block in distance protection based on a microcomputer-principle and performance analysis

    Publication Year: 1991, Page(s):843 - 847 vol.2
    Cited by:  Papers (7)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors present a new power swing block principle based on a microcomputer. This principle can reliably distinguish short circuits from swings, so that fast tripping is obtained for in-zone faults any time. The authors also analyse and calculate the performance of this principle in the case of different fault locations, fault resistance and power swing cycles. The program is incorporated into ... 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 adaptive busbar protection using single chip microcomputers

    Publication Year: 1991, Page(s):141 - 145 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    An improved single-chip microcomputer (SCMC) with a CPU MCS 8098 based protection system is reported. It's protection functions incorporate a differential current protection as a main protection and breaker failure protection. For three phase differential currents and a zero sequence differential current, four SCMCs are used respectively. The new scheme can effectively avoid nonoperation or malope... View full abstract»

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  • The optimal load flow considering the variation of power load

    Publication Year: 1991, Page(s):306 - 310 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The analysis of conventional deterministic optimal load flow methods were often based on a single operation state. They are not comprehensive enough since they did not consider the effects of load variations and the changes of operation modes. The authors present a new method which applies the stochastic load flow method to the optimal load flow, taking the optimal reactive power compensation of a... View full abstract»

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  • Computerized control on 11 kV distribution network of the Hongkong Electric Co. Ltd

    Publication Year: 1991, Page(s):527 - 529 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The author examines the development, operational experience, and future prospect of computerised control on the 11 kV distribution network of the Hongkong Electric Co. Ltd. (HEC). Computerized control proves to be successful in saving human efforts in carrying out switching manually at substations. Apart from saving time required for switching, it is also a safer means of switching. It also reduce... 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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  • 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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  • 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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  • Design of an online microprocessor based individual phase control of a static VAr compensator

    Publication Year: 1991, Page(s):119 - 122 vol.1
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    An online individual control scheme of the static VAr compensator (SVC) which is constructed using thyristor controlled reactors (TCR) and switched capacitors (SC) is designed to correct power factor and balance three phase line currents. At each sampling instant, the loading conditions are measured by the active power and reactive power (P-Q) transducers between any two phases at the load bus ter... View full abstract»

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