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Generation, Transmission and Distribution, IEE Proceedings-

Issue 3 • Date May 1996

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Displaying Results 1 - 14 of 14
  • Genetic algorithm aided controller design with application to SVC

    Publication Year: 1996 , Page(s): 258 - 262
    Cited by:  Papers (10)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    Usually, it is difficult to use current methods to design a controller with combined continuous and discrete actions. The paper presents a novel approach to solving this problem, i.e. transforming the controller design problem into an optimisation problem and then searching the optimal (or suboptimal) controller parameters by a genetic algorithm. This new approach has been applied to the controller design of a static VAr compensator (SVC) with satisfactory results, which show that the new approach is simple yet powerful View full abstract»

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  • Use of naturally occurring system disturbances to estimate the fault current contribution of induction motors

    Publication Year: 1996 , Page(s): 243 - 248
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    The contribution of induction motor loads to short-circuit currents can be significant and so must be considered when evaluating power system fault levels. Standard procedures for calculating short-circuit currents of induction motors require detailed machine data which may not be available. The Fault Level Monitor (FLM) was recently developed at EA Technology Ltd. to estimate network fault levels including the contribution from induction motor loads. Detailed information of the load or of the network is not required. The estimation technique is based on an analysis of the responses of the power system to naturally occurring disturbances which are recorded by the instrument. The FLM algorithm for predicting induction motor fault level contributions has been examined using simulation studies and comprehensive field tests at two industrial substations and a wind farm. Results are presented which show good agreement between the values obtained from the FLM and from conventional techniques View full abstract»

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  • Application of fuzzy logic stabilisers in a multimachine power system environment

    Publication Year: 1996 , Page(s): 263 - 268
    Cited by:  Papers (10)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    Application of fuzzy logic based power system stabilisers (FLPSS) in a multimachine environment is described. A five-machine power system representing two generation areas is used. The proposed FLPSS uses machine speed deviation and accelerating power as the inputs. The performance of the FLPSS when the system exhibits multimode oscillation phenomenon is illustrated. Simulation tests and results for different operating conditions and disturbances are discussed View full abstract»

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  • Nonlinear optimal-variable-aim strategy for improving multimachine power system transient stability

    Publication Year: 1996 , Page(s): 249 - 252
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    The paper presents an integrated excitation and fast valving controller for improving multimachine power system transient stability. The controller is based on an improved optimal-variable-aim strategy. To avoid transferring measurement information around the system, an `observation decoupled' state-space model for multimachine power systems, which include a fast valve and an excitation system, is adopted. Simulation studies employed to test the controller have been performed on a four-machine six-bus system. The results show that the controller is effective for transient stability enhancement View full abstract»

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  • Combining design and operational knowledge to enhance generator plant diagnostics

    Publication Year: 1996 , Page(s): 300 - 304
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    An approach to the construction of an intelligent system for performing generator plant diagnosis in which a model of diagnostic expertise is constructed prior to actual system development is considered. The use of the expertise of both plant designers and operators has allowed an enhanced model of generator plant diagnostics to be constructed which can identify a fault from a set of observed symptoms in addition to predicting the likely operational impact of the identified fault. This will assist the operator in making better decisions when under severe time pressure. Furthermore, it will allow the operator to assess an appropriate course of remedial actions. The paper discusses the features of design and operational knowledge and how these can be used to derive enhanced diagnostics. A methodology for creating the model of diagnostic expertise is then described. Once the model has been constructed an intelligent system can be developed. An architecture for such an intelligent system is discussed in the paper. An advantage of the modelling approach is that it allows flexibility implementation. The use of a number of potential intelligent system technologies for implementing the system is discussed. A hybrid power station implementation is described which utilises many intelligent system technologies to further extend the decision support available to operators View full abstract»

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  • Design of nonlinear robust excitation control for multimachine power systems

    Publication Year: 1996 , Page(s): 253 - 257
    Cited by:  Papers (19)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    The nonlinear robust control problem of power systems is investigated in the paper. A novel controller for the generator excitation system is set up, based on a combination of H control theory and an exact feedback linearisation approach. The properties of the controller are its complete decentralisation and robustness. The design is well suited to a multimachine system in that it is not based on a infinite bus approximation. Simulation performed on a 13-machine system shows that the proposed controller can not only improve the dynamic performance of the power system but also enhance the system stability, especially the large disturbance stability View full abstract»

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  • Effects of magnetic field induction and ground potential rise on pilot wire relay system operations

    Publication Year: 1996 , Page(s): 290 - 294
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    In the paper, magnetic field induction and ground potential rise (GPR) problems have been evaluated to investigate false responses of pilot wire relays, causing the blackout of a 2100 MVA 161/69 kV substation in a major Taiwanese electric power utility. Based on available field information, the EMTP package was applied to determine the magnetic field induced voltage (MFIV), and a simple model was used for GPR calculations. Those results and an analysis of the false responses are presented. Also, methods for protecting against the MFIV and GPR for the pilot wire relay system are discussed View full abstract»

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  • Phase selection based on superimposed components

    Publication Year: 1996 , Page(s): 295 - 299
    Cited by:  Papers (12)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    A method is described for faulted phase selection for nonunit-distance protection using the superimposed voltages and currents initiated by faults. Even though superimposed voltages and currents are comprised of many incident and reflected waves it is shown for the first time that the criteria used for phase selection remain valid throughout the fault period. The proposed method is hence very powerful. To demonstrate the potential of the scheme, its response to a number of fault conditions is presented View full abstract»

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  • Impacts of demand-side management on reliability cost/reliability worth analysis

    Publication Year: 1996 , Page(s): 225 - 231
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    Electric utilities are responding to public concern regarding the environment and the desire to conserve natural resources by placing increased attention on the customer side of the meter. Demand-side management (DSM) is now an important consideration for electric power utilities. DSM in general refers to any activity adopted by an electric utility that ultimately changes the utility's system load curve. The paper presents a model which can be used to quantify the basic load shaping goals of DSM activities. Twenty new load models were simulated that represent load modification. The proposed models can be used as the basic framework in the design and implementation of a utility DSM programme. The integration of supply-side and demand-side planning in reliability cost and reliability worth analysis is illustrated using the IEEE Reliability Test System. Studies were conducted to assess the effect of considered load-shape modifications on the planning reserve margin and on the total societal cost of electricity. This total cost includes system costs and customer interruption costs but does not include costs associated with implementing DSM View full abstract»

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  • Framework for the incorporation of demand-side in a competitive electricity market

    Publication Year: 1996 , Page(s): 232 - 237
    Cited by:  Papers (27)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    The paper discusses the importance of simultaneous plant production and demand reduction scheduling which is required for the establishment of a full electricity market where demand-side has opportunity to compete with generators, as is the case with the England and Wales Pool's demand-side bidding (DSB) scheme. It also emphasises that demand cannot be generally treated as negative generation because of the ability of demand to redistribute itself in response to price based load management activities. In that sense, an adequate scheduling methodology of available resources (from supply and demand-sides) is needed to facilitate the new market. However, traditional formulations of the plant scheduling problem are not valid when load reduction is available, as gross demand is not known in advance. For that purpose a composite model for optimal generation and demand reduction scheduling is presented in the paper. It is shown that this model can be used for a comprehensive evaluation of possible scenarios for the implementation of demand-side bidding into the electricity market and the assessment of the influence of DSB on total production costs, system marginal price (SMP) profile, capacity element payments and benefit allocation between producers and consumers View full abstract»

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  • Bifurcation route to chaos for a ferroresonant circuit using an electromagnetic transients program

    Publication Year: 1996 , Page(s): 238 - 242
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    The ferroresonant behaviour of a nonlinear power system circuit is examined using the diagnostic tools of deterministic chaos. An electromagnetic transients simulation program is used to retain the component nature of the power system and allow metering as for a real system. The information from state-space trajectories, Poincare´ maps and bifurcation diagrams is compared to that normally available from time and frequency domain analyses. They reveal the global behaviour of the power system and the particular points of behavioural change View full abstract»

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  • Modelling of a transmission tower for lightning-surge analysis

    Publication Year: 1996 , Page(s): 283 - 289
    Cited by:  Papers (32)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    Modelling of transmission towers is an essential part of the travelling-wave analysis of lightning surges in overhead power transmission lines. In this paper, an equivalent distributed constant line model of a transmission tower is developed. The model consists of three parts: main legs; bracings; and crossarms. The surge impedance of each part is expressed by the functions of their dimensions and geometry. This tower model is applied to a 500 kV transmission tower whose surge performance characteristics are measured. It is found that the tower voltage wave shapes, calculated from this model, closely agree with the measured ones. This proves that the authors' proposed tower model simulates well the surge performances of actual transmission towers View full abstract»

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  • Nonunit protection technique for EHV transmission systems based on fault-generated noise. Part 3: Engineering and HV laboratory testing

    Publication Year: 1996 , Page(s): 276 - 282
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (828 KB)  

    The paper describes the various stages involved in the prototype hardware development and implementation of a new protection technique for EHV transmission lines; the fundamental principles, CAD design and performance evaluation using simulated results were described in Parts 1 and 2. The paper includes a description of the experimental setup at the National Grid Company, High Voltage Laboratories, Leatherhead (UK) and illustrates the performance of the prototype hardware when subjected to fault-generated high frequency signals obtained under arcing faults on the experimental rig View full abstract»

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  • Short-term hydro-scheduling using Hopfield neural network

    Publication Year: 1996 , Page(s): 269 - 275
    Cited by:  Papers (13)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (672 KB)  

    An approach based on the Hopfield neural network is proposed for short-term hydro-scheduling. The purpose of short-term hydro-scheduling is to determine the optimal amounts of generated powers for the hydroelectric power units in the system for the next N (N=24 in this work) hours in the future. The proposed approach is basically a two-stage solution method. In the first stage, a Hopfield neural network is developed to reach a preliminary generation schedule for the hydroelectric power units. Since some practical constraints may be violated in the preliminary schedule, a heuristic rule based search algorithm is developed in the second stage to reach a feasible suboptimal schedule which satisfies all practical constraints. The proposed approach is applied to hydroelectric generation scheduling of the Taiwan power system. It is concluded from the results that the proposed approach is very effective in reaching proper hydro-generation schedules View full abstract»

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