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Power Apparatus and Systems, IEEE Transactions on

Issue 12 • Date Dec. 1985

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  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1985 , Page(s): c1 - 3697-c
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1985 , Page(s): c2
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    Freely Available from IEEE
  • An Undergraduate Power Laboratory Using Microcomputer Based Instrumentation

    Publication Year: 1985 , Page(s): 3313 - 3319
    Cited by:  Papers (3)
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    A microcomputer based data acquisition and control system has been installed for use in an undergraduate power systems laboratory. This system has removed the tedium of data collection and display without eliminating meaningful hands-on experience in the laboratory. A menu driven operating system makes the system user-friendly and avoids the tedium of primitive computer graphics and data calls. The students write programs that share memory with the operating system to manipulate acquired data. This allows the user to call system subroutines to control power supplies and acquire data from their programs as well as reach several utilities from the system menu. The system is under continued expansion as resources allow. The system and, more important, the laboratory course that uses the system are well received by the students. View full abstract»

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  • Utility Industry Outlook for Emorging Energy Systems

    Publication Year: 1985 , Page(s): 3320 - 3328
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    This paper summarizes the proceedings of a panel session on the outlook for new energy technologies from a utility industry viewpoint. The panel session took place on Wednesday, February 1, 1984 during the 1984 Winter meeting of the IEEE Power Engineering Society held in Dallas, Texas. View full abstract»

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  • Communication Systems for Load Management

    Publication Year: 1985 , Page(s): 3329 - 3337
    Cited by:  Papers (1)
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    Load management and distribution automation schemes of electric utilities require an extensive, reliable and economical communication system. Several communication technologies have been investigated, tested and employed to optimize these schemes. This paper examines these communication techniques, discusses advantages and disadvantages of each with a special emphasis on power line carrier system (PLC), and finally presents recommendations and suggests areas for future research. View full abstract»

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  • Cancellation of Harmonic Noise in Distribution Line Communications

    Publication Year: 1985 , Page(s): 3338 - 3344
    Cited by:  Papers (4)  |  Patents (3)
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    Adaptive least mean square (LMS) filters are shown to be effective in reducing harmonic noise on distribution power lines. The efficiency of these filters can be improved by imposing constraints. View full abstract»

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  • Testing of Railroad Signal Equipment for Power Line Interference Suceptibility Part I: the Test Jig

    Publication Year: 1985 , Page(s): 3345 - 3351
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    A basic need to permit planhing of new ac power lines near railroad-systems is accurate data for the levels of ac interference that upset the operation of railroad signal compenents or systems. Such data would help the power system and railroad system design engineer understand the magnitude of the interference problem, investigate alternative mitigation approaches, and select one that is cost-effective and mutually agreeable. Under EPRI research program RP 1902-1, IITRI developed a body of key railroad signal equipment susceptibility data in cooperation with the major U.S. manufacturers of this equipment. This paper describes the innovative test jig developed under RP 1902-1 which has been applied to obtain susceptibility data for track and line relays, electronic track circuits, and grade-crossing. warning devices. A companion paper (Part II) describes the results of the tests. View full abstract»

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  • Testing of Railroad Signal Equipment for Power Line Interference Suceptibility Part II: Test Results

    Publication Year: 1985 , Page(s): 3352 - 3359
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    A basic need to permit planning of new ac power lines near railroad systems is accurate data for the level's of ac interference that upset the operation of railroad signal components or systems. Such data would help the power system and railroad system design engineer understand the magnitude of the interference problem, investigate alternative mitigation approaches, and select one that is cost-effective and mutually agreeable. Under EPRI research program RP 1902-1, IITRI developed a body of key railroad signal equipment susceptibility data in cooperation with the major U.S. manufacturers of this equipment. This paper describes the results of the susceptibility tests for track and line relays, electronic track circuits, and grade-crossing warning devices. A companion paper (Part I) describes the innovative test jig developed under RP 1902-1 which was used to perform the tests. View full abstract»

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  • Floating Vector Processor for Power System Simulation

    Publication Year: 1985 , Page(s): 3360 - 3366
    Cited by:  Papers (5)
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    This paper analyzes microprogram functions of the sparse matrix solution to obtain faster power system simulations such as the power flow calculation and transient stability analysis. The hardware structure and extended instructions of a floating vector processor (FVP) which realize simulation speed up are presented. Experimental results of a sparse matrix calculation and a power flow calculation lead to the following results: (1) the sparse matrix calculation, by the FVP is completed about 1.6 times faster than by a conventional array processor; (2) the processing speed of the FVP is ten to fifteen times faster than that of the general purpose supermini- computer Hitachi V90/50 Control Computer on the conditions that the programming style of the programs executed by the FVP is microprogramming fit to the FVP architecture, and the programs executed by the V90/50 are programmed in Fortran with simple optimization; and (3) the speed of the total power flow calculation by the V90/50 with FVP is 2.6 times faster than that by the V90/50 alone. View full abstract»

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  • A Dynamic Power System Model With Graded Precision for Fast Extraction of Pertinent Load Flow Information

    Publication Year: 1985 , Page(s): 3367 - 3375
    Cited by:  Papers (5)
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    In many situations of power system restoration or emergency control load flow, often dynamic load flow, results are needed at a time scale which makes regular load flow computations impractical. In this paper a low order dynamic model is introduced which retains fully detailed and precise representation of the critical components (such as strong backbone lines like EHV or weak tie lines) where the interest is focused and reduces the detail of representation of other parts of the system gradually with their distance from the spotlighted sections where details are needed. The result is a low order and hence very fast computation with not only detailed but also quite precise results for those parts of the system which are critical. This approach is very flexible, it can be used to compute tie line load and frequency swings on an interconnection of areas or static loads on the tie lines of such a system affecting third parties in a power trading situation. It can be used to compute precisely and fast the EHV system loads or any combinations of such elements. The operator is quite free to choose what should be represented in precise detail. View full abstract»

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  • Production Simulation for Power System Studies

    Publication Year: 1985 , Page(s): 3376 - 3381
    Cited by:  Papers (1)
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    Predicting expected generation for different power plants as well as the system's total expected production cost is an integral part of quantitative power system analyses. Numerous publications presenting "exact" as well as "approximate" methods of solving stochastic production simulation problem exist in the literature. However, there is no one publication where a comprehensive review of this extremely important topic is presented. Such a review is the subject of this paper. View full abstract»

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  • Reliability Assessment in Operational Planning for Large Hydro-Thermal Generation Systems

    Publication Year: 1985 , Page(s): 3382 - 3387
    Cited by:  Papers (2)
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    A probability based method and a computer program for reliability assessment in the operational planning of large hydro-thermal generation systems are described. The expected unsupplied energy in a given time interval divided by the annual peak load is used as the reliability index. In calculating this index, the forecast hourly loads, sales and purchases, the changes in the operating schedule and unit operating modes, and the capacity and energy constraints on hydraulic generation are considered. Applications in generation schedule reliability assessment, economy sales assessment, mid-term reserve planning, and maintenance scheduling are presented. View full abstract»

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  • A Complex Y-Matric Algorithm for Transient-Stability Study

    Publication Year: 1985 , Page(s): 3388 - 3394
    Cited by:  Papers (1)
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    The algorithm reported here has been implemented on IREQ's Transient Stability program (ST600) since 1980. Its strong convergence allowed many severe disturbances on Hydro-Quebec's system to be properly simulated. No convergence problems directly attributable to the basic algorithm have been observed. View full abstract»

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  • Optimal Dynamic Dispatch Owing to Spinning-Reserve and Power-Rate Limits

    Publication Year: 1985 , Page(s): 3395 - 3401
    Cited by:  Papers (20)
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    This paper deals with the formulation and solution of the optimal dynamic dispatch problem owing to spinning-reserve and power-rate limits. The power production of a thermal unit is considered as a dynamic system, which limits the maximum increase and decrease of power. The solution is obtained with a special projection method having conjugate search directions that quickly and accurately solves the associated non-linear programming problem with up to 2400 variables and up to 9600 constraints. View full abstract»

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  • Optimal Static Dispatch With Linear, Quadratic and Non-Linear Functions of the Fuel Costs

    Publication Year: 1985 , Page(s): 3402 - 3408
    Cited by:  Papers (5)
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    This paper describes and compares several fast algorithms for the solution of the static dispatch problem for thermal power units without transmission losses. Both linear, quadratic and non-linear functions are discussed to describe the fuel costs. Moreover, units that use two fuels at the same time and units with fuel constraints are discussed. View full abstract»

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  • Dynamic Behaviour of AGC Systems Including the Effects of Nonlinearities

    Publication Year: 1985 , Page(s): 3409 - 3415
    Cited by:  Papers (6)
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    A general mathematical model capable of representing multi-area, multi-unit systems has been used to study the dynamic behaviour of AGC systems. The eigenvalues of the system are obtained and classified. The modes which play the most Important role in the system dynamics are identified and related to the system control loops. The effects of the nonlinearities are assessed by their position in the control loops. It is shown that the adverse effects of the nonlinearities are pronounced when the linear model at operating point, has lightly damped critical modes. The effects of the nonlinearities can be minimized by increasing the damping of these modes using methods outlined in the paper. View full abstract»

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  • Derivation and Applications of Optimum Bus Incremental Costs in Power System Operation and Planning

    Publication Year: 1985 , Page(s): 3416 - 3422
    Cited by:  Papers (1)
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    Currently utility companies in North America are encouraging customer cogeneration as an alternative to system expansion, mainly to alleviate some of their financial burdens due to ongoing construction projects. This new trend, calls for a rational basis for utilities to compute payments for third party producers. This paper investigates two schemes, one based on the system incremental cost (SIC) (System Lambda) and the other based on optimum Busload Incremental Costs (BIC's) defined as the minimum additional operating cost due to a unit magnitude of energy increment at all system buses taken one at a time. We show here that, unlike the SIC, the BIC's provide the true cost of electricity at all system buses under all operating conditions. Hence, these should prove an excellent basis for a unified policy in the tariffication of economy interchanges. View full abstract»

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  • A Power System Operator Emulator--the Security Assessment Task

    Publication Year: 1985 , Page(s): 3423 - 3427
    Cited by:  Papers (2)
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    Most computer programs available to the engineer and operator are very strong computational tools. The most valuable and effective tool in the control room, however, is an experienced operator. This paper presents a method by which the deductive and inductive decisions which an operator makes in assessing system security are emulated on a computer. This emulator learns about the system every time a contingency analysis or load flow is performed, and makes a security assessment every time a state estimator is run. This type of program would make the equivalent of an experienced operator available to the actual operator at any time. This would be useful to inexperienced operators or when the system was in a rarely seen configuration. View full abstract»

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  • An AC/DC/AC Interface Control Strategy to Improve Wind Energy Economics

    Publication Year: 1985 , Page(s): 3428 - 3434
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    A control strategy for an AC/DC/AC interface to smooth or limit wind farm output is investigated. The need to follow rapid power variation from uncontrolled wind farms with expensive gas turbines limits the amount of penetration of wind energy systems in existing utilities. An AC/DC/AC interface makes it possible to limit the power variations from the wind farm. An optimal level to which the wind output should be limited is found in terms of the distribution of wind power output and the relative cost of the fast acting and base loaded units. Using the optimal cutting point for the wind output each wind farm can be included in the economic dispatch calculation. The economic advantage of limiting wind power output is demonstrated on an example system. Using a hypothetical system it is shown that wind penetrations as high as 16.75% may be economical using the optimal strategy made possible by the AC/DC/AC interface. View full abstract»

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  • Planning Demand-Management Programs Based Upon Customers' Perceived Value

    Publication Year: 1985 , Page(s): 3435 - 3441
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    This paper describes a new customer preference based approach for planning demand- management programs. It utilizes the concept of perceived value of electric service to consumers. After introducing and defining this concept, its central role in major aspects of utility planning is discussed. View full abstract»

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  • Transformer Tap Estimation at Florida Power Corporation

    Publication Year: 1985 , Page(s): 3442 - 3445
    Cited by:  Papers (9)
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    This paper discusses a transformer tap estimation algorithm added to the Florida Power Corporation real-time state estimator. Computational details and field test comparison results are discussed. Conclusions regarding the algorithm's accuracy and usefulness are noted. View full abstract»

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  • Developemnt of Operator Training Curricula Using the Instructional Systems Development Approach

    Publication Year: 1985 , Page(s): 3446 - 3452
    Cited by:  Papers (3)
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    The training of power system operators has always been important because of their crucial decision making role in operating the system safely and economically. The increasing complexity of the power network, the sophistication of the computerized control centers, and the operation of the system closer to its limits, have focussed attention on the effectiveness of this training. It has become obvious that the training curriculum must be carefully designed to meet all the objectives of trainee performance. In this paper, a step-by-step method to develop training curricula using the instructional systems development approach is presented. This approach, developed principally in the U.S. Department of Defense, has been successfully used by NASA, the airlines and other industrial sectors. The experience in using this method to develop a training curriculum for the Arizona Public Service Co. is described. View full abstract»

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  • An Economic Assessment of Battery Storage in Electric Utility Systems

    Publication Year: 1985 , Page(s): 3453 - 3459
    Cited by:  Papers (8)
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    The commitment for future electric generating capacity constitutes a major business decision for utility companies. Consideration of a new or emerging technology can increase the uncertainties associated with this decision. Utilities considering battery systems based on an estimated installed cost should be aware of appropriate breakeven costs at which batteries would economically compete with conventional capacity alternatives. View full abstract»

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  • A Hybrid State Estimator: Solving Normal Equations By Orthogonal Transformations

    Publication Year: 1985 , Page(s): 3460 - 3468
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1679 KB)  

    The standard approach to the solution of the weighted least square (WLS) state estimation in power system is the iterative normal equations method. Occasional ill-conditioning has been experienced with this method. Recently alternative solution approaches based on orthogonal transformations have been proposed. Sparsity generally suffers in these methods. In this paper, the network condition which causes ill- conditioning is studied. A hybrid approach which enjoys the same numerical robustness of the orthogonal methods with sparsity close to the standard WLS method is presented. The modification needed to implement the hybrid method on an existing standard WLS state estimation program is quite small. View full abstract»

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  • A Computerized, Cluster Based Method of Building Representative Models of Distribution Systems

    Publication Year: 1985 , Page(s): 3469 - 3474
    Cited by:  Papers (1)
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    An automatic, computerized procedure is used to generate a representative model of a large distribution system. Although the distribution system may have hundreds of feeders, the representative model has only 12, reducing manpower and computer costs in studying major issues such as voltage regulation, equipment loading, and operating policy. This computerized procedure reduces the distribution system to a 12 feeder model using a clustering method that groups feeders into sets of feeders with similar characteristics. 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