By Topic

Power Apparatus and Systems, IEEE Transactions on

Issue 11 • Date Nov. 1983

Filter Results

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

    Page(s): c1 - 3712-b
    Save to Project icon | Request Permissions | PDF file iconPDF (855 KB)  
    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (210 KB)  
    Freely Available from IEEE
  • Distributed Energy Control System Installation Challenge

    Page(s): 3489 - 3495
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1280 KB)  

    The new Energy Management System (EMS) to monitor and control the Gulf States Util ities Power System is proceeding under an innovative implementation approach. The hierarchical system will have redundant computers at six locations with 216 Remote Terminal Units (RTUs) interfaced to the power grid in power plants and substations. This paper deals with the implementation philosophy and methods that offer promising improvements in problem areas common to EMS installations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Coordinated Statewide Load Management and Scada System

    Page(s): 3496 - 3501
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (985 KB)  

    The Oglethorpe Fbwer Corporation is implementing a Coordinated Statewide Load Management and SCADA (Supervisory Control and Data Acquisition) System to perform load control in a coordinated manner for its member corporations' service areas throughout the State of Georgia and to provide SCADA capabilities for most of its member corporations. It is a multi-computer system consisting of new as well as existing computer systems and communication systems. This paper describes the design of the overall system and considerations leading to some of the approaches chosen. It also addresses the advantages of integrating load-management and SCADA functions into one system and discusses the functions required in coordinating load-control operations in a utility with multiple operating companies. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Using a Unit Commitment Program to Coordinate Power Transactions with Internal System Generation

    Page(s): 3502 - 3508
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (931 KB)  

    Jacksonville Electric Authority (JEA), an oil-burning municipal in Florida, currently has contracts with Southern Company to purchase up to 600 MW of "coal-by-wire" power. An important operating question facing the JEA control staff is: "How should the JEA internal dispatch be coordinated with the Southern purchase to minimize the system production costs while still maintaining the system security requirements?" To answer this complex question, JEA engineers use a unit commitment program which has a global optimization capability. The purpose of this paper is to describe the computer program, report computational experiences, and present a sample interchange coordination study to illustrate practical applications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Assessment of Electrical Energy Losses in the Colombian Power System

    Page(s): 3509 - 3515
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1057 KB)  

    The electrical energy losses for the entire Colombian power network comprising distribution voltage levels up to the high voltage transmission levels are calculated. The energy losses are classified as "physical" losses corresponding to Joule effect-(I2R), Corona and core transformer losses and "black"-losses which are defined as the difference between the energy available at the consumer level and the energy- effectively billed by the different electric utilities in Colombia. A new methedology for calculating the-"physical" losses is presented which is extensively ba sed in the use of computerized methods including state estimation for the high voltage network and radial load flow for the distribution levels. The "black" losses ses including metering errors, theft and billing errors are calculated with statistical methods also using computerized tools. The results obtained highlight-the importance of the losses in terms of loss of revenue for the electrical energy utilities. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Cost-Effective Digital Enhancement of an Analog Steam Operator Training Simulator

    Page(s): 3516 - 3521
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4529 KB)  

    A hybrid expansion of a serviceable control board training simulator for fossil plant operators is described. Plant-specific parameter scaling and incorporation of an actual single-phase generator and model power system were accomplished through the use of inexpensive digital equipment with little hardware development. Capital expenditure limitations in difficult economic times were overcome by stopping short of full scale simulation goals, while still enabling students to be trained using the major systems and parametric levels associated with the actual plants they operate. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Personal Scientific Computing Environment: A New Approach to Power Industry Computer Applications

    Page(s): 3522 - 3528
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3008 KB)  

    Another revolution is occurring in computer hardware that will affect computer users in the power industry. The first generation of powerful personal1 computers for scientific applications is now on the market. These computers have several advantages over conventional computers: very fast graphics, uniform response time, and a visually-oriente user environment that increases user productivity dramatically. These advantages are the result of having a very powerful processor devoted to a single user's needs. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Advanced Technology for the Control of an Unattended, Hydro Power Plant

    Page(s): 3529 - 3533
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1040 KB)  

    The automation of an unattended power plant, located at a remote site, requires design concepts different from those generally applied to control systems at attended locations. The usual dual, redundant computer configuration which has been proven to be satisfactory for manned control centers or attended power plants does not solve the basic problem of unattended, automatic stations, i.e., the problem of getting human assistance only when there is a definite need for intervention. This paper describes how the application of new technology makes possible a low-cost yet reliable control system which can effectively perform all of the required automatic functions and at the same time act as a permanent, full-time, plant operator, not quite as intelligent as its human counterpart but smart enough to ask for outside help when needed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power System Response to a Large Disturbance: Energy Associated with System Separation

    Page(s): 3534 - 3540
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (940 KB)  

    Formulating the power system equations with respect to the system's inertial center, it is shown that a large disturbance tends to pull each generator from the rest of the generators, forming a two-machine equivalent. The energy associated with this equivalent is related to the energy function for individual machines, previously developed by the authors. Parameters of the two-machine equivalent are derived for any generator versus the rest of the system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Implementation, Testing, and Field Installation of the Iberduero Power System State Estimator

    Page(s): 3541 - 3548
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1480 KB)  

    The investment in both time and man- effort that utilities make in supplying an initial data base, testing, debugging, and commissioning a state estimator is quite large. This paper addresses the modelling, data base definition and debugging, testing, and tuning associated with a state estimator, as well as problems encountered during the field installation. The proper sequence of steps necessary for the initial checkout of a state estimator in the field is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experimental Evaluation of Instruments for Measuring DC Transmission Line Electric Fields and ION Currents

    Page(s): 3549 - 3557
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5262 KB)  

    In the fall of 1979, the newly formed Dc Field and Ions Working Group of the Corona and Field Effects Subcommittee sponsored a field program for the purpose of evaluating and comparing various instruments available for measuring electric field and ion current in the vicinity of hvdc transmission lines. In total, 9 separate field meters and 5 separate ion current meters were used. Results of the field program demonstrate the difficulties of making accurate measurements in an outdoor environment with presently available instrumentation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Variable Impedance Transformer Models for use in Real-Time Security Analysis Functions

    Page(s): 3558 - 3563
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (983 KB)  

    Traditional constant leakage reactance transformer models used in state estimation and load flow oriented real-time functions are not always appropriate for two-winding and three-winding transformers. In some cases the leakage reactance varies as much as fifty percent (50%) over the full transformer tap range. For three-winding transformers, the reactance for one of the legs of the model may change sign over the full transformer tap range. This paper presents the transformer models used for these variable leakage reactance transformers. Field state estimation results are included. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reactor Operations: The Role for Computers

    Page(s): 3564 - 3570
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2473 KB)  

    The time between initial design choices for a nuclear reactor control room and plant commissioning approaches 8-10 years. Thus, even new plants often reflect the state-of-the-art of 10 years before, especially if the designers approached their task in a conservative fashion. The result is that few currently operating plants employ advanced computer display or control systems. At the same time, however, increasingly complex plant operations and regulatory requirements as well as economic pressures to improve efficiency and productivity are causing increased interest in computer assisted reactor operation in both new and older nuclear generating stations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Atlantic Electric System Control Center

    Page(s): 3571 - 3576
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1037 KB)  

    The paper describes the features of the new con- trol center being implemented by the Atlantic City Electric Company (AE) to replace its existing control equipment. The Energy Management System (EMS) of the System Control Center (SCC) is intended for control and dispatching of AE's transmission and generation system. AE is a member of the PJM Interconnection and the system design requires that the SCC operate as a satellite control area of the PJM Pool. Described in the paper are details of the computer configuration, the data acquisition and communications interfaces, and the dispatch and control methodology. Also described are the advanced functions to monitor the security of the transmission and generation system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Ohio Edison Energy Control Center

    Page(s): 3577 - 3581
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (908 KB)  

    The Ohio Edison Company is implementing a new Energy Control Center for its System Dispatch Office (SDO) to perform Economic Dispatch and Automatic Generation Control, Data Acquisition and Supervisory Control of its transmission system and Advanced Security Assessment. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Low-Order Approximation of Transmission Line Parameters for Frequency-Dependent Models

    Page(s): 3582 - 3589
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (953 KB)  

    Frequency-dependent line models are considerably more accurate than constant-parameters models. However, constant-parameters models are very easy to use and do not require the elaborate data preprocessing procedures needed with frequency-dependent models. For this reason, when large systems are simulated, constant-parameters models are still an attractive alternative to model secondary lines; however, the accuracy of the overall simulation may be compromised when the effect of one or more of these lines is under-estimated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Task Scheduling on Multiprocessors for Power System Problems

    Page(s): 3590 - 3597
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1205 KB)  

    The paper describes a technique f or estimating the minimum execution time of an algorithm or a mix of algorithms on a multiprocessor. Some changes to the multiprocessor structure to further reduce the execution time are identified. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Corrective Control Computations for Large Power Systems

    Page(s): 3598 - 3604
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1190 KB)  

    This paper presents a novel methodology for optimal corrective and/or emergency controls computations. It is based on a model reduction procedure, and linearization leading to a linear program which is solved via a dual simplex algorithm with upper bounds developed specifically for this problem. The methodology computes optimal adjustments of generation schedules, VAR source allocations, transformer tap settings and if necessary load shedding. In case of problem infeasibility, it computes the best possible adjustments which will move the operating state of the system closer to a secure state. In addition an analysis of the impact of each individual control action on the emergency conditions of the system is generated. Capacitors and reactors are switched in/out in discrete steps. Such discrete controls are handled with an efficient suboptimal procedure based on a partial enumeration of linear programming relaxations. A computer program has been developed. The software are sparsity coded. Efficiency evaluation of the various components of the program is given. The methodology is illustrated with sample results from two test systems: (a) the IEEE 30 bus system, and (b) the Georgia Power Company's 500 kV/230 kV/115 kV system, which is a 981 bus system. The second test system demonstrates the applicability of the method to practical large scale systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Nepex Pool Control Center

    Page(s): 3605 - 3610
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1226 KB)  

    The paper describes unique or unusual facets of a specific pool control center namely that of the New England Power Exchange (NEPEX). The NEPEX System is responsible for coordinating and directing the operation of generation and transmission facilities in New England. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of Decomposition Techniques to the Mid - and Short - Term Scheduling of Hydrothermal Systems

    Page(s): 3611 - 3618
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1378 KB)  

    This paper describes a methodology for coordinating the mid and short-term scheduling of hydrothermal systems. The technique is able to "translate" the electrical problems at the short-term level into a constraint to be added to the mid-term scheduling problem. This constraint, called a Benders cut, only refers to weekly target variables in the mid-term problem. The Benders decomposition therefore allows a "feedback" between the short-and mid-term models with only a few modifications required in the specialized algorithms used at each level. A case study with the Brazilian Southeast Network is presented and discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comprehensive Generation Control and Dispatch System for an Electric Utility with Special Requirements

    Page(s): 3619 - 3623
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1030 KB)  

    The ability to control a power system in real-time with considerations for unusual generation configurations and heavy industrial loads has become increasingly important to utility operations for a number of reasons. An Energy Control System which includes special techniques in the real-time generation control and dispatch algorithms to solve these problems has recently been delivered to the Duquesne Light Company. All generation resources, including jointly-owned units, combined -cycle units and units located external to the control system boundary, are considered for control and dispatch. Large, non-conforming, industrial loads which cause wide swings in the system's net interchange and Area Control Error, such as arc furnaces and rolling mills, have been accounted for, while still allowing the control system to respond properly to system emergencies and changes in system load. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A New Computer-Based Flux-Restrained Current-Differential Relay for Power Transformer Protection

    Page(s): 3624 - 3629
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1761 KB)  

    The paper begins with a review of techniques for computer based protection of multi-winding three-phase power transformers. After reviewing the principles of harmonic-restraint and voltage-restraint current differential protection, the paper develops a technique which computes and uses flux-current relationship of the transformer to obtain. the restraint function. It is shown that this protection technique requires fewer computations as compared to the harmonic current computation, and hence can be implemented on a microcomputer of modest. capability. The principle has been tested. in the'laboratory on a model power transformer. The relay based on this flux-restraint principle performs well on all the system phenomena simulated in the laboratory. It is expected that a relay based on this principle will be tested in the field on a power transformer. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Remvec Energy Control Center

    Page(s): 3630 - 3636
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1495 KB)  

    The Rhode Island-Eastern Massachusetts-Vermont Energy Control (REMVEC) is implementing a new Energy Control System which is to be located in the Control Center at Westborough, Massachusetts. REMVEC operates as a satellite of the New England Power Exchange (NEPEX) which coordinates and directs the operation of all major electric power and generation facilities in the New England area. REMVEC was established for the purpose of operating a bulk power supply dispatching center for the electric utilities in a portion of New England and currently consists of seven private and thirty one municipal utility systems serving about 2,300,000 customers with a peak load of about 7900 MW. The new Energy Control System consists of two large-scale processors and four front end mini-computers configured in a dual redundant mode. Included are both Network Security programs as well as Energy Control programs in addition to the basic software to support the SCADA/MMI functions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability Limited Load Supply and Interchange Capability

    Page(s): 3637 - 3643
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (861 KB)  

    Traditional load supply and interchange capabilities represent maximums based on steady state generation, line flow and voltage constraints. If the system cannot survive a list of transients when operated at these capabilities, the current computational algorithms do not provide a means for systematically determining alternative secure capabilities. In this paper, the recent results in direct stability methods are applied to give reasonably rapid solutions to this problem. The concept of a Potential Energy Boundary Surface (PEBS) is utilized to obtain transient energy stability margins and their sensitivity to load levels. The energy margins and their sensitivities are used to direct a systematic search for approximate stability limited capabilities. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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