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Generation, Transmission and Distribution, IEE Proceedings C

Issue 2 • Date Mar 1993

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Displaying Results 1 - 14 of 14
  • Series self-excited HVDC generation

    Publication Year: 1993 , Page(s): 141 - 146
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (384 KB)  

    A new concept in HVDC generation simplifies the design of unit-connected generator-convertor plant. The generator exciter winding is connected in series with the output of the HVDC convertor and takes the place of the conventional smoothing reactor. As the existing steady-state AC-DC formulation is not directly applicable to the series connection a new algorithm is developed to simulate its perfor... View full abstract»

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  • Transient stability margin prediction using equal-area criterion

    Publication Year: 1993 , Page(s): 96 - 104
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (656 KB)  

    The authors present an extension of the equal-area criterion for multimachine systems and applies it to the determination of the transient stability margin (TSM) of critically disturbed machines, for a given contingency, for real-time applications. This can be considered as a continuation of the transient stability assessment which normally does not report the TSM quantitatively. The method has be... View full abstract»

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  • Monte Carlo approach to substation reliability evaluation

    Publication Year: 1993 , Page(s): 147 - 152
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (448 KB)  

    The authors describe a Monte Carlo approach to substation reliability evaluation. The results obtained by this method are compared with those obtained using an analytical approach. The simulation procedure for component and substation evaluation is described in detail. The study results show that the simulation approach gives acceptable reliability indices when compared with the analytical evaluat... View full abstract»

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  • High-impedance fault detection system using an adaptive element model

    Publication Year: 1993 , Page(s): 153 - 159
    Cited by:  Patents (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (656 KB)  

    An adaptive-element model approach for high impedance fault detection is presented. The system employs multiple detection algorithms using different frequency parameters. To obtain a final fault/nonfault classification for a power distribution feeder, a revised adaptive-element model is applied using expert weights associated with each algorithm-parameter pair. The adjustment of the weight, assign... View full abstract»

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  • Online transient stability evaluation of interconnected power systems using pattern recognition strategy

    Publication Year: 1993 , Page(s): 115 - 122
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (760 KB)  

    Using the method of pattern recognition, an online strategy has been developed for assessing the transient stability of interconnected power systems and for evaluating the security transfer limits between neighbouring systems. This strategy makes use of: an online pattern database which contains vital system data for defining the stability of the interconnected systems; an algorithm for retrieving... View full abstract»

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  • External thermal resistance of aerial bundled cables

    Publication Year: 1993 , Page(s): 65 - 72
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (592 KB)  

    The calculation of the current carrying capacity of cables in air by the IEC method requires that the external thermal resistance be known, determined from the temperature-dependent heat dissipation coefficient, which includes both convection and radiation losses, and the temperature rise of the surface of the cable. To extend the method to twisted bundled cables, still-air and wind tunnel tests h... View full abstract»

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  • Unified control strategy for back-to-back HVDC convertor stations

    Publication Year: 1993 , Page(s): 77 - 86
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (748 KB)  

    Control of HVDC back-to-back links is normally maintained with separate controllers at each end. The authors propose a single unified controller for both ends, and assess its performance. Two new measures of the difficulty of connecting a DC link to a weak AC system are developed, which take into account the link control strategy. Simulation results are used to investigate the performance of the u... View full abstract»

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  • Cascaded harmonic synchronous machine

    Publication Year: 1993 , Page(s): 131 - 140
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (656 KB)  

    In a number of applications of generating and motoring, a low shaft speed is required. The usual way of providing this low speed is either through large diameter multipole machines or through high-speed machines in conjunction with a gearbox. A novel machine has been designed which can interface the mains to a low-speed shaft without the necessity for a large number of poles. The principle of oper... View full abstract»

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  • Steady-state mathematical models of convertors with biparametric regulation

    Publication Year: 1993 , Page(s): 105 - 114
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (712 KB)  

    The benefits brought to electric power systems by reactive power static compensation are well known. Further benefits can arise when an independent active power compensation and a reactive one are carried out together, especially if the electronic apparatus can be controlled rapidly. Independent and rapid control of both active and reactive power can be achieved by convertors with biparametric reg... View full abstract»

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  • Effect of mixed convection on external thermal resistance of cable in air

    Publication Year: 1993
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (64 KB)  

    The author comments on the paper by V.T. Morgan on mixed convection effects on thermal resistance of multicore bundled cables in air (see IEE Proc. C, Gener. Transm. Distrib., vol.139, no.2, p.109-16, 1992). The author gives a qualitative approach to determining the thermal resistances due to both natural and forced convection respectively. The original author replies to the comments View full abstract»

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  • Analysis of foundation grounding systems with external loops and rods

    Publication Year: 1993 , Page(s): 73 - 76
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (288 KB)  

    The influence of a loop conductor with vertical rods, embedded in soil and galvanically connected with a foundation grounding system, on the grounding resistance of such a complex grounding system is presented. The frequent practical case of a foundation grounding system in the form of a rectangular concrete block with a horizontal grid inside, surrounded by a loop with vertical rods, is analysed ... View full abstract»

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  • Phase co-ordinate model for analysis of isolated power systems

    Publication Year: 1993 , Page(s): 123 - 130
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (520 KB)  

    A computational procedure employing a phase co-ordinate reference frame has been used to study the transient behaviour of a group of induction motors when they become isolated from a large power system and fed from a standby generator. The model applied enhances flexibility in studying symmetrical and asymmetrical operating conditions, and shows how phase co-ordinate models can be used for detaile... View full abstract»

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  • Fuzzy control of SMES for levelling load power fluctuation based on Lukasiewicz logic

    Publication Year: 1993 , Page(s): 91 - 95
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (392 KB)  

    Provided that superconducting magnetic energy storage (SMES) is located near the consumer in the power system, levelling of fluctuating load power and compensation of reactive power can be achieved. Thus, loss in the power system can be reduced and the power system stability can be improved. An SMES control strategy for levelling the fluctuating load power based on Lukasiewicz logic is proposed. T... View full abstract»

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  • New contingency ranking technique incorporating a voltage stability criterion

    Publication Year: 1993 , Page(s): 87 - 90
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (284 KB)  

    A new technique for ranking outages in power systems is presented. Traditional methods for ranking are limited to cases where the system state under the respective contingency condition can be simulated. Cases where a load-flow solution is unobtainable are unexplained. The new method presented can similarly rank all cases of contingencies, and cases that can cause voltage instability and system co... View full abstract»

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