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Generation, Transmission and Distribution, IEE Proceedings C

Issue 1 • Date Jan 1991

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Displaying Results 1 - 13 of 13
  • Small rating capacitive energy storage for dynamic performance improvement of automatic generation control

    Publication Year: 1991 , Page(s): 103 - 111
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    A new scheme using a small rating capacitive energy storage (CES) unit for the improvement of the dynamic performance of a power system is proposed. A comprehensive digital computer model of a two-area interconnected power system including governor deadband nonlinearity, steam reheat constraints and boiler dynamics is developed. Time domain simulations are used to study the performance of the power system and control logic. Optimisation of gain parameters and stability studies are carried out by the second method of Lyapunov. Suitable methods for control of the CES units are described View full abstract»

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  • Frequency and duration method for reliability evaluation of large-scale hydrothermal generating systems

    Publication Year: 1991 , Page(s): 94 - 102
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (712 KB)  

    The authors present a general frequency and duration (F&D) method that is especially adequate for predominantly hydro generating systems. The method is based on the property that not only the probabilities of reserve states can be evaluated recursively by discrete convolution but also their frequencies. Therefore, appropriate truncation and rounding techniques can be introduced allowing an efficient computation of frequency and duration indices for large-scale generating systems. The performance of the proposed F&D algorithm is analysed with two test systems. The IEEE Reliability Test System is used to measure the impact of the truncation and rounding techniques. The characteristic behaviour of frequency and duration indices in hydro systems is illustrated by a case study with the Brazilian South/Southeastern generating system View full abstract»

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  • Method of equal probability overvoltages for calculating risk of failure of power transmission lines

    Publication Year: 1991 , Page(s): 19 - 26
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (660 KB)  

    The author presents a generalised numerical method for calculating the risk of failure of power transmission lines due to switching overvoltages. The method incorporates the influence of overvoltage profile and differences in breakdown properties of insulation along the line on the risk of failure, irrespective of their probability distribution laws. The risk is calculated for several overvoltage probability distribution laws and line insulation levels. The influence of the overvoltage distribution along the line, i.e. overvoltage profile, on the risk of failure is considered for overvoltages obtained by calculations, as well as for overvoltages obtained by measurements on a specific transmission line. If the breakdown properties of insulation are given as a function of the wave front duration, it is possible by this method to incorporate into the calculations the influence of the wave front duration along the line on the risk of failure View full abstract»

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  • Power generation scheduling through use of generalised network flow programming

    Publication Year: 1991 , Page(s): 39 - 46
    Cited by:  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    The authors present a constrained economic dispatch (CED) formulation that is based upon generalised network flow programming (GNFP). The methodology for applying GNFP to the CED problem is developed and illustrated using four examples: 5, 39, 264, and 515-bus systems. Starting with a solved loadflow case, execution times for the CED are shown to be about the same as for a Newton-Raphson loadflow, and memory requirements are approximately 75% of the loadflow. Salient features of the CED-GNFP method include the ability to minimise generation cost while meeting constraints on line flows and area interchange. Network location of loads and generators is automatically considered without need of penalty factors, and transmission line flow limits do not affect solution times significantly View full abstract»

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  • Approach to automatic contingency selection by reactive type performance index

    Publication Year: 1991 , Page(s): 65 - 68
    Cited by:  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    The authors present a novel approach to studying the automatic contingency selection (ACS). The total curtailment of the reactive loads is used as the performance index to evaluate the severity of contingencies. The minimum cost network flow model is proposed to determine the optimal curtailment in the line outage case. The objective of the model is the determination of the sum of branch voltage drops in terms of the line reactive flows. The optimisation model is solved by the out-of-kilter algorithm. The numerical results for several IEEE sample systems show that the proposed technique is feasible and effective View full abstract»

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  • Optimal design of electricity distribution networks

    Publication Year: 1991 , Page(s): 69 - 77
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (764 KB)  

    The interactive system, NETOPT, may be used to design subtransmission networks, principally at the 33 kV level, adopting an interconnected design philosophy advocated by MANWEB. All secure networks that are designed are stored and can, at any time, be displayed graphical and analysed by a load flow program. A relatively inexpensive, deterministic design process based on Lagrangean relaxation is employed. The cost structure used is completely new. The problem of security specification is overcome by the use of: an existing, statistically derived, security function; a constraint generation scheme which adds missing constraints to the problem formulation when required; a collection of other new security assessing procedures. A series of cost cutting features have been added to the reformulated problem to minimise the solution time View full abstract»

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  • Optimal switching of dynamic braking resistor, reactor or capacitor for transient stability of power systems

    Publication Year: 1991 , Page(s): 89 - 93
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    Three dynamic braking strategies for transient stabilisation of a power system are investigated. These involve resistor, resistor-reactor and resistor-capacitor switching, respectively. The switching strategies are obtained from an optimum feedback control law. The proposed controls are tested on a four-machine power system. It is observed that although all the optimal strategies are able to contain the first swing instability, the resistor-capacitor switching is the best for electromechanical as well as electrical transients control View full abstract»

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  • Decomposition approach for minimising real power losses in power systems

    Publication Year: 1991 , Page(s): 27 - 38
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (992 KB)  

    An efficient method for minimising real power losses and improving the voltage profile of large scale power systems is presented. The problem is solved through optimal adjustments of reactive power generation in the system by changing generator voltages, shunt capacitors, and tap setting of tap changing transformers. It is formulated in a linearised form suitable for the linear programming technique and decomposition methods. The power system planning and corresponding problems with the addition of new reactive power sources have been integrated with the operational characteristic of the system, and results have been presented. Superiority of the method lies in the reduction of the computation time and memory space, as well as a fast convergence for the solution of large scale systems View full abstract»

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  • Application of power system stabilisers in a plant with identical units

    Publication Year: 1991 , Page(s): 11 - 18
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (548 KB)  

    A new modal technique to analyse the effects of a signal to be fed back to stabilisers in a plant with identical units is proposed. The contribution of a mode on an output signal is used as a measure of the coupling input-mode-output to verify the effectiveness of the signal. The effects of stabilisers on oscillation modes are then analysed. Attention is then paid to selective control of modes. It is concluded that not only a sum of speeds but many other signals may be used for cancellation of the contribution of intraplant modes on system response. With this cancellation, stabilisers may be applied on a plant without deteriorating the damping of these modes View full abstract»

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  • 24-pulse HVDC conversion

    Publication Year: 1991 , Page(s): 57 - 64
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    A technique known as DC ripple reinjection, which has already been shown capable of operating a six-pulse rectifier effectively as a twelve-pulse convertor, is extended to convert the standard twelve-pulse HVDC convertor group into a 24-pulse configuration. Theoretical and experimental results are provided to demonstrate that the modified convertor configuration eliminates the 12-pulse related harmonics on both sides of the convertor View full abstract»

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  • Direct solution of distribution systems

    Publication Year: 1991 , Page(s): 78 - 88
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    The authors report on a direct power flow solution technique for radial distribution networks. The special topology of distribution networks has been fully exploited to make direct solution possible. A unique branch and node numbering scheme is proposed to achieve storage and computational economy. Composite load characteristics can be easily modelled. The method developed is extended for meshed and unbalanced distribution networks. In both cases, modifications required are few and the advantages obtained in balanced radial networks in respect of storage and computational requirements are preserved. The proposed method is successfully applied to the solution of a number of practical distribution networks View full abstract»

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  • Studies on asynchronous operation of synchronous machines and related shaft torsional stresses

    Publication Year: 1991 , Page(s): 47 - 56
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (824 KB)  

    Asynchronous operation of synchronous generators is considered during power system disturbances. Particular emphasis is given to the shaft stresses which develop during such operation. Reduction in the working life of the generators due to shaft fatigue is evaluated and the advantages and disadvantages of this type of operation are investigated View full abstract»

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  • Application of pattern recognition techniques for online security-economy and reactive control of power systems

    Publication Year: 1991 , Page(s): 1 - 10
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (808 KB)  

    The author discusses a new methodology for applying the pattern recognition method developed by the author in the two related areas of security-economy preventive control and reactive control. Each application varies the amount of active and/or reactive (P-Q) power injected into the network busbars, and the network then responds by readjusting its busbar voltages and flows accordingly. Using the amount of P-Q busbar injections for evaluating the relative merits of one control measure against the others, a `raise' and a `lower' priority list may be formed for correcting overload on each transmission line and for correcting undervoltage at each busbar. The author also describes the development and results of an algorithm formulated using the linear programming technique to shift busbar P-Q injections for relieving the overloaded transmission lines, and for minimising the busbar P-Q injection change during shifting View full abstract»

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