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Power Apparatus and Systems, IEEE Transactions on

Issue 2 • Date Feb. 1982

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Displaying Results 1 - 25 of 38
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
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    Freely Available from IEEE
  • Effects of Special Purpose Hardware in Scientific Computation with Emphasis on Power System Applications

    Page(s): 265 - 270
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    Several uses for special purpose numerical hardware for scientific applications have recently been proposed [1, 3, 6]. However, few of those innovations have yet been implemented. We discuss some of the characteristics essential for an application to effectively use a special purpose processor. We examine some power system applications and argue that their present form is not suitable for systems that include special purpose processors. View full abstract»

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  • A Distribution-System-Cost Model And Its Application to Optimal Conductor Sizing

    Page(s): 271 - 275
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    A dynamic model for the development of primary and secondary circuits supplying a residential area is described and exercised. Features of the model which support optimal conductor sizing are the evaluation of annual revenue requirements associated with capital requirement and energy losses as area load evolves. These revenue requirements are responsive to change in area load (positive or negative) arising with change in the number of residences and change in the load per residence; year by year. Results of optimization trials explore the relative penalties incurred for optimal conductor policies based on incorrect projections of load growth, degree of load management expected, and costs of losses. View full abstract»

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  • Use of Computer Graphics in Data Management Systems for Distribution Network Planning in "Electricite de France" (E.D.F.)

    Page(s): 276 - 283
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    Two data management systems for distribution network planning (L.V. and M.V. systems) are used by many EDF Distribution Centers. View full abstract»

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  • Distribution System Integrated Voltage and Reactive Power Control

    Page(s): 284 - 289
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    Automated distribution systems offer new opportunities for improved control of voltage and reactive power at the distribution substation and feeder level. Digital processor algorithms which can have the objective functions of controlling voltage and reactive power and minimizing feeder losses in an integrated fashion according to specified priorities are described. Simulation results using a representative simplified distribution feeder configuration are presented based on the algorithms developed in connection with the PROBE [1] substation and feeder automation research project. This work is being advanced as a part of the development of the Integrated Distribution Control and Protection System engineering prototype for EPRI in Project RP 1472-1. View full abstract»

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  • Agra, the New Operation Model for the "La Rance" Tidal Power Plant

    Page(s): 290 - 294
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    The "La Rance" tidal power plant, in operatiorr since 1967, needs a sophisticated program to compute the optimal operation of its 24 bulb-units and 6 gates. The first version of this program, 12 year old, had to be replaced. In that paper, we state the optimal operation problem, choose the optimization method, and describe the dynamic programming method used in the new version. View full abstract»

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  • Simulation of a Multiprocessor Network for Power System Problems

    Page(s): 295 - 301
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    A network of computers arranged in a modified ring structure has been designed for solving in parallel the equations describing dynamic disturbances on large power systems. The operation of this network when solving a 1732-bus, 398-generator system using an algorithm based on the Bonneville Power Administration's Transient Stability Program has been simulated on a CDC 6600. The purpose of the simulation was to determine how efficiently the algorithm can be executed in parallel on this multiprocessor configuration. The critical part of the algorithm is the forward and back substitution passes through the LDU decomposed I = YE equations. Parallel execution times for various combinations of processors and the corresponding gains over a conventional serial solution are given. View full abstract»

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  • Multiprocessor Static State Estimation

    Page(s): 302 - 308
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    Two classes of distributed processor algorithms are proposed. One class is based on weighted least square methods and the second class is based on relaxation methods. Analytical and simulation data are given to illustrate the computational properties of both algorithms. View full abstract»

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  • An On-Line Method for Transmission Ampacity Evaluation

    Page(s): 309 - 315
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    The evaluation of transmission equipment ampacity using heat balance models with statistical weather data has been utilized extensively as a planning tool by power utilities for a period of time. Since the transmission facilities are exposed to a fluctuating weather envitonment and operating conditions, the traditional practice is to use very conservative data in the ampacity calculations. This approach, however, seriously limits the efficient use of transmission facilities from the operating point of view because the assumed conservative conditions rarely happen[1]. View full abstract»

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  • On the Validation and Analysis of a New Method for Power Network Connecticity Determination

    Page(s): 316 - 324
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    The analysis method and results of a power network connectivity determination algorithm, part of the CONCE project, the central part of ENHER's computerized dispatching system, are reported together with a validation of the latter through practical measurements. The algorithm is constructed by repeated invocation of the same connectivity determination procedure for an abstract graph. Although emphasis is given to a version consisting of two steps, substation and overall network, a three step imiplementation is also suggested together with its possible advantages. The main concepts upon which the algorithm is based are reviewed briefly. The analysis shows that the processor time involved in its execution is linearly proportional to the power network dimensions. This fact suggests that the algorithm could be used with advantage for large power networks. View full abstract»

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  • Power System Tracking State Estimation and Bad Data Processing

    Page(s): 325 - 333
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    In this paper the tracking of the time yarying power system static state is analysed. The relative importance of the small measurement noise and the eventual occurrence of gross error in the measurements is used as a design criterion for the development of fast tracking estimators. The basic approach uses a pre-estimation bad data detection/ elimination scheme based on the exponential smoothing of past estimations and logical checks followed by an estimation stage. Three different estimation algorithms were tested: plain weighted least squares, quadratic square-root and linear criterion. Numerical results showing the performance of the three estimators in a simulated test case are also presented. View full abstract»

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  • An Efficient Method for Real-Time Simulation of Large Power System Distribances

    Page(s): 334 - 339
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    This paper describes a method capable of simulating, interactively and in real time, the dynamic behaviour of a power system under emergency conditions. The method has been developed as a suitable basis for a digital simulator for use in training operators to deal effectively with severe disturbances. View full abstract»

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  • Energy Strategy Planning for Electric Utilities Part I, Smarte Methodology

    Page(s): 340 - 346
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    Power system planners today face a radically different environment from that of twenty years ago. Long-term trends are changing dramatically, uncertainty is greater and more pervasive, and a host of priorities conflict. Existing planning tools are inadequate in this set of circumstances. This paper presents a new planning methodology, based on simulation, modeling and regression, and trade-off evaluation (SMARTE). SMARTE is an approach of great generality which overcomes limitations of existing simulation programs as well as present optimal planning packages. View full abstract»

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  • Energy Strategy Planning for Electric Utilities Part II, Smarte Methodology Case Study

    Page(s): 347 - 355
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    For the MIT study of Con Edison's energy system, a new methodology which uses regression analysis to relate selected data from the several special-purpose tools was developed and successfully applied. The use of a large simulation-optimization computer package was deemed to have significant disadvantages (for convenience, accuracy, time-expense, and overall command of the task). The new method relates these data to provide trade-off analyses and uncertainty analyses¿the key factors in today's multi-objective, multi-parametered strategic planning. View full abstract»

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  • Computational Techniques for an Electrical Distribution and Information Control System

    Page(s): 356 - 362
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    This paper discusses the network analysis functions that are associated with the Electrical Distribution and Information Control System (EDICS for the real-time monitoring and control of the North York Hydro electrical distribution system. The methods presented can be adapted to any distribution network topology and automated control philosophy. Dynamic color displays are provided to effectively show the electrical state of the network, while a unique analysis method estimates network flows in the presence of circuit loops and feeder parallels. A simulation study subsystem provides a means for the dispatcher to verify the consequences of switching orders before they are issued and to investigate potential overload conditions. View full abstract»

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  • Data Base Model for Distribution Facilities

    Page(s): 363 - 370
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    In this paper we describe an electric facilities data base model which: - Provides data for engineering analysis, accounting and map production. - provides efficient access to data by electric network or by area. - has been implemented at several utilities. The model presented in this paper in incorporated in two IBM programs: Interactive Geo-Facilities Graphic Support (IGGS) and Geo-Facility Data Base Support (GDBS). The programs - provide for the storage of geographic and alphanumeric information, including electric facilities and land features. - support selective updating and display of both the geographic and alphanumeric data using an interactive workstation. View full abstract»

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  • Linking Distribution Facilities and Customer Information System Data Bases

    Page(s): 371 - 375
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    PGandE has been working for several years on the design and implementation of a Distribution Data Base System (Codename: MIDAS). MIDAS will maintain all gas and electric distribution facilities in geographically related data base form. From this single source it will be possible to perform such functions as drawing maps, analyzing electric circuits and gas networks, and preparing tax reports. View full abstract»

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  • Variable Structure Control of Electric Power Generation

    Page(s): 376 - 380
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    A control scheme to reduce the mismatch in power generation and consumption of electric power systems is developed using the variable structure systems concept. This scheme is introduced to refine the dynamic properties of the presently used integral controller which has been originated in accordance with a steady state concept. The new controller changes its structure according to a certain logic which results in distinct advantageous properties. View full abstract»

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  • Spinning Reserve Constrained Static and Dynamic Economic Dispatch

    Page(s): 381 - 388
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    One of the recurring problems facing energy control center dispatchers each day is how to operate the system during the periods of high load pickup, such that there is sufflcient generation to follow the load pickup, while still maintaining reasonable reserve and/or regulation margin. This paper shows a technical solution to this problem which can be achieved with a very efficient use of computer resources. The problem is expressed as a dynamic programming scheduling problem, and a feasible, but suboptimal solution is proposed, which eliminates the usual search space problem. This method reduces the problem to a backward sequence of dispatch problems, with the generator limits being carefully adjusted between each time interval in the solution sequence. The paper also discusses an efficient algorithm for the solution of a reserve constrained economic dispatch, which is the static optimization technique used at each interval. View full abstract»

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  • An Analysis of Electric Power Brokerage Systems

    Page(s): 389 - 396
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    The purpose of electric power brokerage systems, such as the one established in Florida, is to reduce the aggregate cost of generating electricity by making short-term transfers of electric power between utilities (economy energy exchanges). However, the methods currently used to determine the buyers and sellers, and the quantities exchanged, can be improved to increase the savings. Two new algorithms are presented that result in greater savings to the utilities--a network flow algorithm applicable to the Florida system, and a more general algorithm using a version of dynamic programming. The effects of several methods of dividing the savings among the utilities are discussed. Finally, some initial ideas are presented on how an energy broker can be extended to longer time periods. View full abstract»

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  • Optimal Power Flow Based Upon P-Q Decomposition

    Page(s): 397 - 405
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    The optimal power flow problem is formulated based upon the decoupling principle well recognized in bulk power transmission loadflow. This principle is exploited by decomposing the OPF formulation into a P-Problem (P-¿real power model) and a Q-Problem (Q-V reactive power model); which simplifies the formulation, improves computation time and permits a certain flexibility in the types of calculations desired (i.e., P-Problem, Q-Problem or both). View full abstract»

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  • Developments in Optimal Power Flow

    Page(s): 406 - 414
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    This paper presents an advanced power flow methodology for optimally dispatching all active and reactive power in a power system. Two major obstacles impede the success of most optimization algorithms: (1) computational inefficiences associated with large system and (2) the problems associated with handling functional inequality, constraints. In view of these basic problems, techniques are presented to improve the solution algorithm, the handling of penalty functions, and the power solution optimization methodologies. Additionally, new algorithms are provided for the determination of an optimal step length and for scaling of control variable gradients. These improvements and innovations computing techniques have been incorporated into a computer program and demonstrated on practical size power systems. View full abstract»

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  • A Fast and Robust Variable Metric Method for Optimum Power Flows

    Page(s): 415 - 420
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    The Han-Powell algorithm has proved to be extremely fast and robust for small Optimum Power Problems [1]. There is every reason to believe its performance could be extended to large problems, provided its one serious disadvantage is eliminated. This disadvantage stems from its use of nonsparse approximations to certain Hessian matrices. These matrices are of dimension (m x m) where m is the number of decision variables. Since all the network variables are retained by the algorithm as decision variables, the Hessians quickly get too big to be conveniently accommodated. One remedy is to add a variable-reduction-procedure. Berna, Locke and Westerberg [2] have developed one such procedure. It helps but does not completely eliminate the difficulties. This paper develops another reduction procedure with concepts borrowed from the fields of network dissection and parallel processing. The computations are arranged in two nested loops. The inner loop eliminates n < m of the variables by satisfying the problem's n equality constraints to a tolerance that is tightened as the problem's solution is approached. The outer loop applies the Han-Powell algorithm to the reduced problem. Besides eliminating the need for dealing with unwieldly Hessians, this "reduced method" appears to be as robust as the original Han-Powell algorithm and converges at least as fast for small problems. The method has not yet been tested on large problems, but it is reasonable to expect that it will perform as well on them. View full abstract»

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  • Interactive Short Circuit System

    Page(s): 421 - 425
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    During the past few years, power system engineers have used interactive computing as an aid in solving power system planning problems. Most of the development work has been concentrated in the load flow area. Interactive load flow systems have been implemented on dedicated mini-computers as well as on large general purpose corporate computers. View full abstract»

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Aims & Scope

This Transactions ceased production in 1985. The current retitled publication is IEEE Transactions on Energy Conversion and IEEE Transactions on Power Delivery, and IEEE Transactions on Power Systems.

Full Aims & Scope