IEEE Transactions on Power Systems

Issue 1 • Feb 1992

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Displaying Results 1 - 25 of 61
  • Damping structure and sensitivity in the NORDEL power system

    Publication Year: 1992, Page(s):97 - 105
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    To enhance the inherent damping of power systems due to generators and loads, a variety of stabilizer configurations can be used for the generators, static VAr compensators (SVCs), and high-voltage DC (HVDC) links. How the overall damping matrix is built up from these contributions is studied. This is used to develop a technique for systematic siting of damping equipment in power systems with seve... View full abstract»

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  • The implementation of an energy brokerage system using linear programming

    Publication Year: 1992, Page(s):90 - 96
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The authors focus on the economics involved in energy transfers. The function of an energy brokerage system is to establish interchange schedules between participating utilities in such a manner as to maximize the resulting savings. A brokerage system that uses linear programming (LP) is presented to maximize the savings or profits to each utility subject to import and export constraints. The cost... View full abstract»

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  • Estimation of parameter errors from measurement residuals in state estimation [power systems]

    Publication Year: 1992, Page(s):81 - 89
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    Any error of network parameters affects the value of the measurement residuals calculated in state estimation. Explicit mathematical expressions relating the residuals to the parameter errors are derived. A two-step approach is proposed for parameter error estimation. The first step is to estimate a bias vector which combines the effects of parameter errors and the state of the system. A least-squ... View full abstract»

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  • Engineering economics on inflation

    Publication Year: 1992, Page(s):73 - 80
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    To review the engineering literature on inflation, 82 references, including texts in engineering economics and capital budgeting, where annotated and grouped. Of these, the dozen most recent texts in engineering economics were systematically compared according to their treatment of inflation and their terminology. The history of the terminology and the treatment of inflation in discounted cash flo... View full abstract»

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  • A security based approach to composite power system reliability evaluation

    Publication Year: 1992, Page(s):65 - 72
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    An electric power network containing generation and transmission facilities can be divided into several states in terms of the degree to which adequacy and security constraints are satisfied in a reliability evaluation of the composite system. The composite system is classified into different system states for which probabilistic indices are calculated. Both annualized and annual indices using a s... View full abstract»

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  • Fast calculation of a voltage stability index

    Publication Year: 1992, Page(s):54 - 64
    Cited by:  Papers (215)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    The minimum singular value of the power flow Jacobian matrix has been used as a static voltage stability index, indicating the distance between the studied operating point and the steady-state voltage stability limit. A fast method to calculate the minimum singular value and the corresponding (left and right) singular vectors is presented. The main advantages of the algorithm are the small amount ... View full abstract»

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  • Real-time digital simulator for power system analysis on a hypercube computer

    Publication Year: 1992, Page(s):1 - 10
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    A digital simulator based on a hypercube-type massively parallel computer, the NCube2, has been developed. The simulator features: real-time simulation of a large power system which covers transient stability through long-term behavior with constant accuracy level in root mean square values; user-friendly man-machine interfaces which mimic the actual operating environment including interactive set... View full abstract»

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  • Incorporation of SVCs into energy function methods

    Publication Year: 1992, Page(s):133 - 140
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The incorporation of static VAr compensators (SVCs) into energy function methods is described. The consequences of SVCs encountering limits are of particular interest. At a limit point, the network description undergoes a change. System behavior is not smooth. This lack of smoothness is investigated. A valid energy function, which includes the effects of SVCs and their limits, is established. Stab... View full abstract»

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  • Exact-decoupled rectangular-coordinates state estimation with efficient data structure management

    Publication Year: 1992, Page(s):45 - 53
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    The authors deal with the solution of power system estimate problems using node voltages in rectangular coordinates. The Jacobian matrix is diagonalized, and the mismatching vector is modified following the ideas proposed by other investigators for decoupling the Jacobian matrix when using polar coordinates. The proposed method decouples the Jacobian matrix into real and reactive-power submatrices... View full abstract»

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  • Short-term load forecasting using an artificial neural network

    Publication Year: 1992, Page(s):124 - 132
    Cited by:  Papers (254)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    An artificial neural network (ANN) method is applied to forecast the short-term load for a large power system. The load has two distinct patterns: weekday and weekend-day patterns. The weekend-day pattern includes Saturday, Sunday, and Monday loads. A nonlinear load model is proposed and several structures of an ANN for short-term load forecasting were tested. Inputs to the ANN are past loads and ... View full abstract»

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  • Current industry practices in bulk transmission outage data collection and analysis

    Publication Year: 1992, Page(s):158 - 166
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    The scope of the task force was to outline techniques and procedures for analysis of bulk transmission outage data, and to explain the uses and limitations of calculated statistics. The task force had the following objectives: survey the utility industry on the collection and analysis of bulk transmission-independent outage events; evaluate the basic concepts necessary to develop performance indic... View full abstract»

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  • Voltage stability conditions considering load characteristics

    Publication Year: 1992, Page(s):243 - 249
    Cited by:  Papers (104)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    It is shown that when the characteristic of the composite load of a typical utility system is taken into account, large disturbance voltage stability is assured by the existence of the stable equilibrium state of the post-disturbance system, as determined from the standard power flow model. When the load contains static components, stability limits extend considerably. The exact limit for such loa... View full abstract»

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  • Voltage control improvement through capacitor and transformer tap optimization

    Publication Year: 1992, Page(s):222 - 227
    Cited by:  Papers (38)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The authors present a study of the existing and planned voltage control devices on the Ohio Edison (OE) transmission and subtransmission system. These devices included 104 transformers, most of which are fixed tap, and over 100 sites for new or additional capacitor bank installations. The intent was to determine the transformer tap settings and reactive allocation to provide the best possible volt... View full abstract»

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  • Evaluation of wheeling and nonutility generation (NUG) options using optimal power flows

    Publication Year: 1992, Page(s):201 - 207
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The application of optimal power flow for the evaluation of wheeling and nonutility generation (NUG) related options is presented. Both wheeling and NUG options affect vital attributes such as system security, voltage profile, losses, and VAr reserves. These options put a strain on the existing transmission system and may restrict economic utility dispatching. Optimal power flows may be used to de... View full abstract»

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  • Belgian interutility data exchanges within operation

    Publication Year: 1992, Page(s):301 - 306
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The existing Belgian national control center uses a multicomputer-based SCADA system, in operation since 1976. A new system has been ordered. This EMS (energy management system) tool consists of application computers and software, SCADA (supervisory control and data acquisition) and communication processors. It also includes an emergency control center. Data exchanges between national and regional... View full abstract»

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  • Real-time reactive security monitoring

    Publication Year: 1992, Page(s):432 - 437
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Severe economic penalties are imposed by constraints on energy transfers imposed by contingent voltage support problems in power systems. The analysis outlined uses the granularity that characterizes power networks to define zones within which reactive reserves must match contingent reactive requirements in order to avoid voltage support problems. Tracking of reserves relative to contingent requir... View full abstract»

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  • Transient stability test systems for direct stability methods

    Publication Year: 1992, Page(s):37 - 43
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A standard set of power system data with benchmark results are presented against which direct stability techniques to assess transient stability can be compared and tested. The test systems have been selected to display a wide range of dynamic characteristics to provide a robust test of the efficacy and accuracy of the various analytical techniques to analyze transient stability. Transient stabili... View full abstract»

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  • Optimization of energy procurement and load management

    Publication Year: 1992, Page(s):327 - 333
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    Programs for optimizing energy procurement are incorporated in the control center of the Pflazwerke AG. A main element in the optimizing strategy is load management. The authors deal with the procedures for energy import optimization based on the results of a load forecast program. Special emphasis is put on load management and the investigations for modeling the load behavior depending on season,... View full abstract»

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  • A microcomputer controlled static VAr compensator for power systems laboratory experiments

    Publication Year: 1992, Page(s):371 - 376
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The authors report the development of the laboratory model of a microcomputer-controlled static VAr compensator. The model can be useful for teaching. A control circuit with simple hardware was designed to fire the thyristors whose delay angles were controlled by the programmable interval timer 8253. Simple software strategies of either proportional plus derivative (PD) or proportional plus integr... View full abstract»

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  • Control of voltage stability using sensitivity analysis

    Publication Year: 1992, Page(s):114 - 123
    Cited by:  Papers (104)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    The effects of static compensation on the voltage stability boundary are investigated. For a class of voltage instabilities which correspond to static bifurcations of load flow equations, minimum singular values of the Jacobian matrix and total generated reactive power are calculated as indicators of stability margin, and sensitivity methods are used for reactive support allocation. Improvement in... View full abstract»

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  • Reader's guide to subsynchronous resonance

    Publication Year: 1992, Page(s):150 - 157
    Cited by:  Papers (126)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    Many utilities are either applying or considering applying series capacitors because of the economic advantage. But the hazards to turbine-generators require that utility engineers fully understand and thoroughly analyze the effects of subsynchronous resonance (SSR) caused by series capacitors. To help in the understanding and analysis of SSR, the authors consolidate and review the key issues. Dis... View full abstract»

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  • Highly interactive operation workstation for distribution automation system using spatial data management

    Publication Year: 1992, Page(s):180 - 186
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A highly interactive operator workstation for a distribution automation system using spatial data management was developed. The spatial data structure, called MD-tree, manages a large amount of equipment data and its background map data hierarchically. By its rapid range searching and the related techniques, fast response time and a user-friendly interface are obtained on a reduced instruction set... View full abstract»

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  • A new computational tool for composite reliability evaluation

    Publication Year: 1992, Page(s):258 - 264
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The authors describe the modeling assumptions and computational aspects of a computational tool for composite reliability evaluation, CREAM. The reliability evaluation methodology for power systems is based on Monte-Carlo sampling with a variance reduction scheme which allows the incorporation of user experience or of analytical models as regression variables. The component of reliability indices ... View full abstract»

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  • A hybrid artificial neural network-dynamic programming approach to unit commitment

    Publication Year: 1992, Page(s):236 - 242
    Cited by:  Papers (67)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    A hybrid dynamic programming-artificial neural network algorithm is studied. The proposed two-step process uses an artificial neural network to generate a preschedule according to the input load profile. A dynamic search is then performed at those stages where the commitment states of some of the units are not certain. The experimental results indicate that the proposed algorithm can significantly... View full abstract»

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  • Data communication standards for power utilities-A European perspective

    Publication Year: 1992, Page(s):215 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    The development of electric utility communication technology, during the next decade is addressed. Two main factors are identified: the European single market and the environmental tasks of the nineties. The standardization efforts in Europe are seen as the motivation behind this development. Some of the standardization efforts reflecting this trend are described View full abstract»

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Aims & Scope

Covers the requirements, planning, analysis, reliability, operation, and economics of electric generating, transmission, and distribution systems for general industrial, commercial, public, and domestic consumption.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Nikos Hatziargyriou
National Technical University of Athens