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Generation, Transmission and Distribution, IEE Proceedings C

Issue 5 • Date Sep 1988

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Displaying Results 1 - 12 of 12
  • Shunt reactor switching tests in BC Hydro's 500 kV system

    Publication Year: 1988 , Page(s): 420 - 434
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1096 KB)  

    Following a number of failures to clear when switching out 500 kV shunt reactors, a series of reactor switching tests was conducted to determine the causes of the failures and to ensure adequate specification of circuit breakers for such future applications. The results of the tests and the conclusions drawn are presented View full abstract»

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  • Criteria for interfeeder switching in distribution systems

    Publication Year: 1988 , Page(s): 461 - 467
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    The purpose of the paper is to find the optimal criteria for interfeeder switching in a distribution system during emergency conditions. A feeder in a distribution system usually has several interfeeder switches properly located along the feeder to link with other feeders. Under emergency conditions, such as when faults occur on the distribution feeder, these switches are operated interdependently to minimise the loss of load and to prevent or unbalance power flow on the distribution feeders. A computer program is developed to find the optimal switching algorithm. The cost function of the switching operation is defined, and the bipartite graph network is constructed according to the configuration of the distribution system. The binary integer programming technique is used to minimise the objective function which is set up based on the relief of feeder overloading and unbalance. A distribution system comprising several substations in the Taiwan Power Company is selected for the simulation of optimal switching and the accuracy and efficiency of this program are verified View full abstract»

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  • Load forecasting under spot pricing

    Publication Year: 1988 , Page(s): 369 - 377
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    Time varying tariffs such as spot pricing give rise to changes in load magnitude as well as effect a redistribution of load with respect to time. The author proposes mathematical models, centred on the concepts, cross-time price elasticity matrix, decomposition of the price and time correlations of load, forecasting of consumer price anticipation and forecasting natural load variation. These elements are interacted against the system power production cost database for short run demand forecasting. Sophisticated approaches such as this will replace established forecasting methods wherever short run time variable tariffs are adopted View full abstract»

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  • Design optimisation of power system stabilisers based on model and eigenvalue-sensitivity analyses

    Publication Year: 1988 , Page(s): 406 - 415
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (912 KB)  

    Although the general principle and structure of the power system stabiliser (PSS) for supplementary control have long been established, the best siting of, and choice of the parameters in, the PSS call for much design ingenuity and effort when used in multimachine systems. Reported in the paper is the experience obtained of PSS optimisation through the extensive application and development of techniques of modal and eigenvalue-sensitivity analyses. Simultaneous consideration is given to damping both the inter-area mode and the local mode in the optimisation strategy. A fresh look at the basis for selecting the lead/lag compensation stages is also described View full abstract»

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  • Photovoltaic power generators for radio communication systems in Jordan

    Publication Year: 1988 , Page(s): 385 - 388
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    The authors present the measured values of potential of solar energy in Jordan, as well as the application of photovoltaic generators to communication systems such as relay stations (repeater stations) and railway radio communication systems Furthermore, the effect of solar radiation and temperature on the characteristics of modules and on designing and sizing of photovoltaic systems is also discussed View full abstract»

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  • Identification of optimum site for power system stabiliser applications

    Publication Year: 1988 , Page(s): 416 - 419
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    The author presents a modal-based identifying method of the optimum site for power system stabilisers. A recent concept of participation factors is extended by introducing new coupling factors, which enables a direct selection of generators where the application of stabilisers yields maximum improvement of overall system damping characteristics. The performances of the proposed method are studied and compared with those of the previous methods, on the example of the well known ten-machine test system View full abstract»

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  • Approach to the study of small-perturbation stability of multimachine systems

    Publication Year: 1988 , Page(s): 396 - 405
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (828 KB)  

    A generalised approach to modelling multimachine systems is presented for stability analysis. The more systematic and realistic representation, accompanied by the development of powerful eigenvalue-analysis techniques facilitates the study of the oscillation behaviour of complex interconnected systems. The study highlights the dependence of instability tendencies on large power angle differences between machines and incompatible excitation characteristics for the various machines. Based on this understanding, alternative practical remedies are investigated. The analytical approach developed, together with the discussions in the paper, also provides a firm basis for considering the introduction of power system stabilisers into multimachine systems View full abstract»

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  • Evaluating the approximate probability distributions of load point reliability indices in power distribution networks

    Publication Year: 1988 , Page(s): 450 - 460
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (808 KB)  

    The reliability assessment of power distribution networks is concerned with the evaluation of a set of five basic indices for each load point of interest. These indices are random variables because they are functions of the component performance parameters and the characteristics of system operating procedures which are random variables by nature. Computational modelling techniques have been published to evaluate the mean values of the indices, applying both the total and partial loss-of-continuity criteria. It is, however, important to obtain more information about the variation of the indices around their means. The purpose of the paper is to describe the computational techniques that have been developed to evaluate the approximate probability distributions associated with the load-point reliability indices in a meshed distribution system with any given configuration. These techniques incorporate all realistic failure and restoration modes that are known to exist in power distribution networks. The results of an analysis on a 150/20 kV Hellenic distribution system are also presented in the paper View full abstract»

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  • Digital protective relaying through recursive least-squares identification

    Publication Year: 1988 , Page(s): 441 - 449
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    Parameter estimation is applied to the problem of transmission line protection. The Fourier coefficients of voltage and current are estimated using recursive least-squares identification. The estimates are then used to detect short circuits. The method is evaluated using data generated by the program EMTP View full abstract»

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  • Comparison of transient performance of superconducting and conventional generators in a multimachine system

    Publication Year: 1988 , Page(s): 389 - 395
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (532 KB)  

    The authors describe the transient performance of a 2000 MVA superconducting turbogenerator operating in a multimachine environment. The results are compared with others, obtained by replacing the superconducting generator by its conventional substitutes. The dynamical effects of introducing the new machine on the overall performance including power system controllers and stabilisers are reported View full abstract»

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  • Optimal consumer response for electricity spot pricing

    Publication Year: 1988 , Page(s): 378 - 384
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    Techniques to optimise consumer response are essential to maximising the overall benefits to consumers and utilities in any short-range marginal tariff scheme. The author develops the theory of categorising consumer load types, proposes appropriate optimisation methods for the different types and considers methods of practical implementation. Potentialities and problems of consumers of various sizes, including small consumers with microcomputing facilities only are discussed View full abstract»

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  • New algorithm for distance protection of high voltage transmission lines

    Publication Year: 1988 , Page(s): 436 - 440
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    Calculated reactance between relay point and fault represents an accurate estimation of fault distance when the fault resistance or the R/L ratios of the equivalent impedance at line ends are very small. When these conditions are not satisfied, a large error results in locating fault distance due to back-feed effect from the remote end. A new recursive algorithm for distance protection is developed, which accurately determines the fault location by predicting the back-feed current. The prediction needs estimated values of the remote end source impedance to be passed to the relay via a communication link. Trip decision is based on checking the evaluated fault location and its variation with time. The algorithm is validated by digitally simulating transmission lines with different fault conditions taking into consideration the reduction in the generator reactance after fault inception. Simulation results show a fault detection time of about one half-cycle View full abstract»

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