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Generation, Transmission and Distribution, IEE Proceedings C

Issue 3 • Date May 1984

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Displaying Results 1 - 8 of 8
  • Determination of voltage-distortion factor for a network loaded with several DC motor drives

    Publication Year: 1984 , Page(s): 81 - 84
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (426 KB)  

    Expressions for the determination of the voltage-distortion factor of a network loaded with several thyristor-regulated DC motor drives have been derived taking into account the simultaneous commutation in the convertors. Approximate expressions for the determination of the voltage-distortion factor are presented. A comparison of computation results with experimentally obtained values of the network voltage-distortion has confirmed the accuracy of the presented method. View full abstract»

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  • Fuel-cost minimisation for both real-and reactive-power dispatches

    Publication Year: 1984 , Page(s): 85 - 93
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1065 KB)  

    The fuel cost formula is developed for optimal real-and reactive-power dispatch for the economic operation of power systems. The problem is decomposed into a P-optimisation and a Q-optimisation module, where both modules use the same fuel cost objective function resulting in the optimal load flow. The control variables are generator real-power outputs for the real-power module; and generator reactive-power outputs, shunt capacitors/reactors and transformer tap settings for the reactive-power module. The constraints are the operating limits of the control variables, power-line flows and busbar voltages. The optimisation problem is solved using the gradient projection method (GPM) for the quadratic objective function and linear constraints. The GPM allows the use of functional constraints without the need of penalty functions or Lagrange multipliers among other advantages. Mathematical models are developed to represent the sensitivity relationships between dependent and control variables for both real- and reactive-power optimisation modules; and thus eliminate the use of B-coefficients. Results of two test systems are presented and compared with conventional methods. View full abstract»

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  • Semiconductor fault-current limiters. Part 1: Problems connected with and possible schemes for implementing short-circuit current limitation in power systems

    Publication Year: 1984 , Page(s): 94 - 97
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (537 KB)  

    Power systems are interconnected to improve system reliability, stability and economy of operation. Because of the large capacity of interconnected systems, the currents fed into faults assume enormous levels. Hence, the need for fault-current limiters (FCLs) particularly for protecting equipments with low ratings, from the consequences of excessive fault currents. A new approach in fault-current limiting in power systems makes use of high-power semiconductor devices, which offer enhanced reliability and improved performance over the conventional types of FCLs. This approach in fault-current limiting in power systems is discussed and a comparison with the existing FCLs is made. View full abstract»

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  • Semiconductor fault-current limiters. Part 2: Investigations on a semiconductor-diode fault-current limiter for use in power systems

    Publication Year: 1984
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (535 KB)  

    Semiconductor-diode fault-current limiters, suitable for limiting subtransient and transient currents in an alternator system during symmetrical and unsymmetrical faults, are investigated. Experimental results covering the time response of line currents, diode current and current through the limiting inductor, as well as voltages across the diode and limiting inductor, are presented. In the laboratory experimental setup a microprocessor-based controller was made use of for fault initiation. Results of computer-aided analysis of a specific case of fault are discussed. View full abstract»

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  • Semiconductor fault-current limiters. Part 3: Investigations on microprocessor-based thyristor fault-current limiter for use in power systems

    Publication Year: 1984 , Page(s): 103 - 106
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (435 KB)  

    The feasibility of using thyristor fault-current limiters to limit transient and steady-state currents in an alternator during a symmetrical fault has been investigated. Experimental results include discussions on time reponse of line currents, current through one of the thyristors and limiting inductor as well as voltage across the thyristor and limiting inductor. Triggering of the thyristor elements has been implemented through a microprocessor-based controller. The fault analysis with the aid of a computer is also included for a specific case. View full abstract»

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  • Microcomputer calculation of fault levels for operational interlocking

    Publication Year: 1984 , Page(s): 107 - 112
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (796 KB)  

    It is shown that an electrical operational interlock for a power generating station must be capable of online fault-level calculations and that conventional methods are outside the capabilities of current 8-bit microprocessors. An algorithm is then developed to calculate fault levels, which is suitable for any network whose associated graph is a tree. The approach is based on the fundamental concepts of fault level and reduction processes related to the network graph. The suitability of this algorithm to practical systems is demonstrated by means of a case study, the accuracy of the computed fault levels being shown to compare very favourably with those from a conventional program. View full abstract»

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  • IEE NW Centre, Supply Section: Chairman's address. Computers in power systems

    Publication Year: 1984
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (150 KB)  

    First Page of the Article
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  • Conference report. IEE winter power metting

    Publication Year: 1984 , Page(s): 114 - 115
    Save to Project icon | PDF file iconPDF (348 KB)  
    Freely Available from IEEE