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Power Apparatus and Systems, IEEE Transactions on

Issue 9 • Date Sept. 1985

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Displaying Results 1 - 25 of 53
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1 - 2640-b
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
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    Freely Available from IEEE
  • Computational Experiments in Power Systems

    Page(s): 2289 - 2295
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    The paper describes a rather comprehensive set of computational experiments for the instruction of senior students in the field of power systems. The experiments are based on a program package called FORCEPS (FORtran Codes for Education in Power Systems). These replace previous laboratory experiments which were only partially adequate to demonstrate the problems of power system operation. Their need stems from the recognition that modern power system planning and operation is extensively computerized and this must be reflected in the teaching process. The experiments cover the major topics of power system steady state and dynamics. Of these, the instructor selects a subset which is-most appropriate for his lecture course. The student obtains a working program in Fortran as well as data for an experimental system, performs tests and comparisons, makes assessments on the capabilities of the program and modifies it if necessary. Only lineprinter plots and printouts are used for output, to permit the use of simple terminals and thus assure maximum portability of the programs. For the same purpose, FORCEPS has in addition to the Instruction Guide for the students, a Reference Section providing theoretical background for all experiments. Since FORCEPS is basically only a collection of useful programs, their full educational value is obtained only by applying the package as a tool for engineering problem solving in a variety of realistic power system problems formulated as projects or assignments. View full abstract»

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  • Microcomputer Based Interactive Graphics for Power System Analysis Education

    Page(s): 2296 - 2301
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    This paper describes an interactive graphics package for power system analysis education. The input of power networks and the output of the calculation results is organized in diagrammatic terms familiar to the engineering practice. The available facilities for direct modification, deletion or addition of any network elements and the fast response to these changes offer a great degree of flexibility in conducting studies for realistic power system problems. A semigraphic video display terminal coupled to a microcomputer with 64k core memory was used to produce the suitable interactive environment. View full abstract»

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  • The Cornell University Kettering Energy Systems Laboratory

    Page(s): 2302 - 2305
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    The new Kettering Energy-Systems Laboratory at Cornell University is described and its functions as a unique electric-power research tool and as an important power-field educational adjunct are discussed. The individual laboratory components and their functions are discussed. These components include both software and real-time hardware simulation tools. Use of the Laboratory in current educational activities is outlined. Possibilities for future development of the facility are examined. View full abstract»

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  • Measuring Customer Preferences for Load Management Service Options

    Page(s): 2306 - 2314
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    This paper illustrates the application of consumer research tools to the measurement of customer preferences for load management service options. The key problem is determining the extent to which customers are interested in such options and the tradeoffs they are willing to make between the conveniences of electric service and its cost. View full abstract»

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  • A Decoupled Method for Systematic Adjustments of Phase-Shifting and Tap-Changing Transformers

    Page(s): 2315 - 2321
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    Exact matrix-vector representations of the power flow equations are used to develop a scheme for systematic adjustment of regulating transformers. The real and reactive power models are both written in matrix-vector form as Ax¿= ¿. The unknowns in the real and reactive power models are the sets of voltage phase angles and unspecified voltage magnitudes at PQ busses, respectively. The real power model includes specified power flows through phase-shifting transformers as injections into busses where such transformers are connected. The reactive power model has a dimensionality equal to the number of load busses less the number of tap-changing transformers. Two separate submodels allow the calculations of phase shifter angle and tap settings. The application of the algorithm to the IEEE standard test systems shows that the algorithm adjusts transformer settings in about the same number of iterations as that for unadjusted solutions. View full abstract»

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  • Experimental Results of a Load Management System for Large Commercial Customers

    Page(s): 2322 - 2328
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    Encouraging experimental results have been obtained from a two-way load management system for large commercial as well as governmental customers on the Potomac Electric Power Company (PEPCo) system. This paper peesents these results and describes the inovative two- way load management system that was developed and installed to achieve them. The Robinton Products, Inc. system operates from a central processor located in PEPCO's control center and it communicates with the customer locations through a telephone system called "Select-A- Station". Future plans for the expansion of the system are presented along with experimental results. View full abstract»

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  • Adaptive Control for HVdc Power Transmission Systems

    Page(s): 2329 - 2335
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    The transient petformance of High Voltage Direct Current (HVdc) power transmission systems depends heavily on the current regulators associated to the converter control systems. The tuning of these current regulators is a function of the converters short- circuit ratio, or equivalently of all the net converter commutation resistances. These resistances vary with the network operating conditions and they are affected by AC system contingencies. View full abstract»

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  • Emergency Control Practices

    Page(s): 2336 - 2341
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    The Emergency Control Task Force was formed in February 1982. In order to clarify and focus its efforts, the Task Force, as its first order of business and after considerable discussion, adopted the following definitions as a basis for its deliberations: Power System Emergency: A condition or state of system operation characterized by one or more violations of "hard" inequality constraints (e.g., short or long term emergency ratings) on the bulk power system. An emergency generally is an indication of a viability crisis and/or a stability crisis. A viability crisis results from an imbalance between generation, loads, and transmission, whether local or system-wide. A stability crisis results from energy accumulated at sufficient level in swings of the system to disrupt its integrity. Power System Failure: A condition or state of system operation characterized by loss of system integrity involving uncontrolled islanding (fragmentation) of the system and/or uncontrolled loss of large blocks of load. View full abstract»

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  • The Application of Dynamic Programming in a Discrete Supplementary Control for Transient Stability Enhancement of Multimachine Power Systems

    Page(s): 2342 - 2348
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    This paper considers the use of a discrete supplementary control for transient stability enhancement of multimachine power systems. The principal advantage of the method presented in this paper is that off-line computations are used. This permits the application of the supplementary control of a "multimachine" power system. The designation "multimachine" is used in this conext to denote systems of up to three machines; for practical systems containing more than three machines, appropriate model order reduction is suggested. Supplementary controls differ from primary controls in that they are only used during disturbances rather than continuously. Attention is focused on the insertion of braking resistors and a specially designed dynamic programming algorithm is described for optimal resistor switching. The switching strategy is computed off-line so that the on-line computational requirements are minimal. The contribution of this paper is in the area of multimachine control and, in particular, a power system emergency state control. Topics concerning control models, optimization criteria and characteristics of discrete supplementary controls have been addressed. Control strategies are evaluated through digital and analog simulation involving a ten machine test system. View full abstract»

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  • State Estimation for Integrated Multi-Terminal DC/AC Systems

    Page(s): 2349 - 2355
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    In the past few years, many papers have been published on state estimation applied to electric power systems. Different types of algorithms-static, tracking and dynamic-have been proposed aside with a variety of applications: detection and identification of bad data, network configurator, etc. Most of such studies have been carried out for AC systems, although there are some power systems around the world with DC links in operation. Moreover, engineers are now considering DC multiterminal networks as a feasible option. Therefore the state estimation techniques have to be extended to deal with such mixed AC/DC systems. So far, few papers have been published on this matter. View full abstract»

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  • The Benefits of Thermal Energy Storage for Cooling Commercial Buildings

    Page(s): 2356 - 2360
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    Thermal Energy Storage, sometimes referred to as Cool Storage, involves the production and storage of cooling capacity during off-peak hours to meet the following day's air conditioning requirements. The most common storage media are ice and chilled water. This article addresses the potential benefits of this technology both to utilities and to their customers. Utilities can expect increased off-peak sales and slower growth of peak demand from widespread use of thermal storage. The results of a project to monitor a bank office with ice storage air conditioning are presented to demonstrate these benefits. View full abstract»

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  • Capacitor Bank Planning for Possible System Contingencies

    Page(s): 2361 - 2366
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    A new method for planning capacitor banks as sources of VARs for voltage maintenance during anticipated normal and contingency conditions is proposed in this work. The objective is to minimize the total investment cost in the new reactive sources. The scheduling technique is based on sequentialty selecting the most severe operating state which requires the maximum reactive power, determining the optimal bus for this state using a cost-based index, and suitably modifying, if necessary, the reactive power installed to satisfy less severe operating conditions. The solution procedure employs the Compensation method (Large- change Sensitivity Technique) for network solution to update bus voltages. The discrete nature of the capacitor bank, the installation, site, and switching facility cost are all conside ed in-the optimitation process. The algorithm also minimizes the number of switchable installations. The proposed VAR scheduling method is compared with the Inverse Jacobian method for accuracy, and with other scheduling ideas for investment costs, via the IEEE 30-bus system. View full abstract»

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  • Interfacing for Universal Multi-Machine System Modeling In an Electromagnetic Transients Program

    Page(s): 2367 - 2373
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    This paper presents a new predictive approach to the intertacing of rotating electric machinery for the transient analysis of universal multi-machine systems, i.e., the machines contained in the system may be of different types-such as induction, synchronous, doubly-fed and direct-current machines, Basic considerations and theory underlying the approach are covered. The corresponding interfacing scheme is shown to be crucial to certain machine types. The approach has been successfully implemented to the Universal Machine module of the well-known Electromagnetic Transients Program (EMTP). Application to test cases involving rather severe transient conditions demonstrates the lack of any interfacing-error amplification. Gain in computational efficiency by application of the proposed interfacing, rather than interfacing as based on phase compensation, is significant. View full abstract»

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  • Dispatcher Training Survey Results

    Page(s): 2374 - 2380
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    This report has been prepared for industry use by the IEEE's Working Group on Operator Training. The purpose of this report is to present the results of a System Operator Training Questionnaire to focus attention on the current status and planned direction of bulk power system operator training. (The term operator is used throughout this report. The operator functions are considered to include operation of the bulk power system including transmission and generation.) View full abstract»

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  • Part I of II Parts Glossary of Terms Related to Load Management

    Page(s): 2381 - 2386
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    The following Part I of II Parts of the Glossary of Terms related to Load Management has been prepared by the Terminology Task Force of the Load Management Subcommittee. The glossary contains many definitions of terms used by the electric utility industry concerning the subject of Load Management. The terms are listed in alphabetical order and cross-referenced where necessary. View full abstract»

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  • Part II of II Parts Glossary of Terms Related to Load Management

    Page(s): 2387 - 2392
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    The following Part II of II Parts of the Glossary of Terms related to Load Management has been prepared by the Terminology Task Force of the Load Management Subcommittee. The glossary contains many definitions of terms used by the electric utility industry concerning the subject of Load Management. The terms are listed in alphabetical order and cross-referenced where necessary. View full abstract»

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  • A New Stabiliser Design Technique for Multimachine Power Systems

    Page(s): 2393 - 2400
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    This paper presents a new method of designing decentralised stabilisers for improved dynamic performance of multimachine power systems. The method determines the parameters of all stabilisers in the system such that some or all of its mechanical modes eigenvalues have desired locations in the complex plane. The proposed algorithm is general, effective and simple to apply. This is illustrated through three numerical examples including a three-machine and nine-machine infinite bus power systems, and with different degrees of system modelling. View full abstract»

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  • Contingency Ranking and Simulation for On-Line Use

    Page(s): 2401 - 2407
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    This paper reports on a unified approach to computing the distribution factors and system performance indices in linear contingency analysis. The algorithm is based on the theory of matrix inversion lemma, and is capable of handling all contingency types including generation, load, multiple branches, bus splits, and their combinations. The derivation of the formulae stresses speed and efficiency, which are factors crucial for an on-line application. View full abstract»

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  • Dispatch and Unit Commitment Including Commonly Owned Units

    Page(s): 2408 - 2412
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    This paper presents an approach to the problem of dispatch and unit commitment of wholly owned and commonly owned units. Operatinag strategies are described and modifications to conventional dispatch and unit commitment programs are examined. Dynamic programming is used as the basic technique to determine an optimum schedule for startup and shutdown of available generating units in addition to unit base generation and production costs. View full abstract»

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  • Insecure System Reactive Power Balance Analysis and Counter Measures

    Page(s): 2413 - 2419
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    One of the consequences of a calamitous system disturbance can be a mismatch of a system's reactive power demand and its reactive power resources. Power system collapses have occurred for both situations-when there has been a reactive power deficit and a reactive power surplus. View full abstract»

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  • Dynamic Study of an Extreme System Reactive Power Deficit

    Page(s): 2420 - 2426
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    Serious social repercussions have occurred to power utilities having suffered a major breakdown. This paper deals with a dynamic study method which demonstrates the effectiveness of procedures to counter a reactive power deficit situation. View full abstract»

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  • Analysis of Pooling 345 kV Bulk Transmission Outage Data Between The Mid-Continent Area Power Pool and Northeast Utilities

    Page(s): 2427 - 2434
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    The 345 kV bulk transmission Forced outage data from two remote regions were converted to a common format. An agreed upon philosophy of analysis was established which was acceptable for both regions. Four separate analyses were performed on the two study region's ( Mid-Continent Area Power Pool and Northeast Utilities ) 345 kV Forced outage data from the study years 1977-1981: Each individual region, comparison of data from the two regions, and the region data pooled. Important environmental differences between the two regions which affected the performance of the 345 kV transmission were identified. It was demonstrated that pooling of the Line-Related suimmer Forced outage data to gain knowledge of the corresponding outage rates was reasonable once the outage data pertaining to important differing environmental parameters were disaggregated. View full abstract»

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  • Household Appliance Magnetic Field Survey

    Page(s): 2435 - 2444
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    The results of a non-comprehensive survey of the 60-Hz magnetic fields produced by common household appliances and tools are reported. Maximum magnetic field levels as a function of distance for about 100 different appliances of 25 basic types are characterized by measurement and presented in graphical form. The measurements represent the highest magnetic fields generated by the appliances in any normally accessible direction from them. All sets of measurements but two were made at the fundamental powerline frequency of 60 Hz and all represent narrowband rms levels of magnetic flux density expressed in UT. Measurements at powerline harmonic and other frequencies were not made. The data presented should be useful in understanding the levels of magnetic field produced by household appliances, and also in estimating magnetic-field exposures in homes and workplaces. 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