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Power Systems, IEEE Transactions on

Issue 1 • Date Feb. 1987

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Displaying Results 1 - 25 of 52
  • 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
  • Reliability Calculation under Planned Maintenance

    Page(s): 1 - 7
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    This paper provides an extension to methods for computing reliability indices in the case of planned maintenance, in particular, a new formula for the frequency of system failure due to overlapping of two outages, forced and planned, is derived for two components. A numerical example illustrates the possibilities of the proposed approach. View full abstract»

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  • Discussion

    Page(s): 7
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  • Constrained Load Flow Using Recursive Quadratic Programming

    Page(s): 8 - 16
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    The present paper will discuss the efficient, practical and definitive algorithm for dealing with constrained load flow problems. Algorithms based on mathematical programming and algorithms based on the load flow calculation methods have been studied since earlier days. However, on account of numerous control variables to be determined and of inadequate calculating efficiency, the guarantee of unfailing solution is yet to be achieved. In the calculating procedure herein described the extents of adjustments are not determined simultaneously for all the control variables ; the control variables considered likely to produce greater adjusting effect are selected one by one and are adjusted successively. This adjustment method, as a consequence, is useful not only for on-line power system operation but also as simulator software for training system operators. View full abstract»

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  • Torsional Interactions between Synchronous Generators and Long Transmission Lines

    Page(s): 17 - 22
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    The dangers of subsynchronous resonance in series capacitor compensated transmission lines have led some utilities to consider the alternative of shunt capacitive compensation, since the electrical resonant frequencies in this case are usually considered to be supersynchronous. However, in heavily compensated or very long lines, at least one of the resonant frequencies may become subsynchronous. This paper examines the torsional interactions between electrical resonant frequencies (which can be supersynchronous or subsynchronous) and the mechanical oscillations of a generator connected to a long transmission line. Examples are given and the electrical damping is calculated in order to evaluate the risk of self-excitation occurring. View full abstract»

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  • Discussion

    Page(s): 23 - 24
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  • A New Approach for Optimal Allocation and Economical Capacity of Generation Reserve

    Page(s): 25 - 30
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    Determination of the installed reserve capacity is an essential part of the power system planning. Considering the network limitations, not only the amount of installed reserve capacity, but also the location of this capacity is an essential factor in improving the reliability level of the system. A new appoach to select the most suitable locations for the installed reserve capacity and its distribution between these locations was developed. The problem was formulated as a mathematical programming problem and was efficiently solved using linear programming technique. The optimal reserve capacity in the system was calculated as the amount which minimizes the total system costs, with the capacity added at the preselected locations. The developed approach was applied to the 220 KV system of A.R.E The final results are presented and discussed in this paper. View full abstract»

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  • Using Decoupled Characteristic in the Synthesis of Stabilizers in Multimachine Systems

    Page(s): 31 - 35
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    A decoupled characteristic between the damping of a specific swing mode and the stabilizer gain of the corresponding machine in multimachine power systems is identified. Using this decoupled characteristic a power system stabilizer (PSS) synthesis approach which is based on the phase compensation concept is verified on a 9-machine system and the dynamic performance of this system is significantly improved. This method is proved to be effective, simple and it can provide useful guidances for the PSS field tuning. View full abstract»

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  • Discussion

    Page(s): 35 - 36
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  • Direct Transient Stability Analysis Using Energy Functions Application to Large Power Networks

    Page(s): 37 - 43
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    This paper deals with the demonstration of the Transient Energy Function (TEF) method in large, realistic power networks. Documented examples of application in power system operation and associated software development for systems up to 228-generators and 1644-buses are given. An overview of the analytical and computational problems encountered in the large scale application of the TEF method is presented. Approaches used to overcome the problems are provided, and the relevant improvements and modifications to the TEF software are discussed. View full abstract»

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  • Discussion

    Page(s): 44
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  • A Methodology for Dynamic Utility Interactive Operation of Dispersed Storage and Generation Devices

    Page(s): 45 - 51
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    This paper is introducing a new methodology for the dynamic integration of dispersed storage and generation devices into the electric utility distribution network operations. The dispersed source is viewed as an active device contributing towards the regulation of real and reactive power flows while improving the stability of the power system. Conceptual means are developed for an effective DSG-utility grid interface. Computer models of appropriate interconnection and control equipment are used in simulation studies to test the effectiveness of control strategies and optimize design parameters. Simulation results indicate that load frequency control and voltage regulation may be effectively accomplished with dispersed generators within a fraction of the time required for conventional regulating units. Appropriate modulation and conditioning of the DSG-output power can assist in damping out undesirable power oscillations. Implementation of the proposed policies may result in reduced load following requirements for conventional power generating units, increase the value and acceptability of new energy technologies, and improve power quality and stability of the interconnected system. View full abstract»

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  • A Cost-Minimizing Approach for Coordinating Short-Term Unit Outages

    Page(s): 52 - 57
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    "How should outages of generating units be coordinated to minimize the total system production costs?" To help answer this question, the control staff at Virginia Electric and Power Company (VEPCO) has been using a unit-commitment program that has a global-optimization capability. The purpose of this paper is to review the outage-coordination problem from a system operator's perspective, describe a method that is currently used at VEPCO to coordinate short-term unit outages, and present actual case studies to illustrate practical applications. View full abstract»

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  • New Energy Management System for the Dutch Power Pool

    Page(s): 58 - 64
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    A new EMS has been ordered to be installed in 1987 for the control of electricity production and main transmission in the Netherlands. The functions of the national control center and their development during the years are indicated. Reasons for ordering a new EMS and the main characteristics of this new system are described. View full abstract»

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  • Fast Thermal Generation Rescheduling

    Page(s): 65 - 71
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    A new dynamic programming algorithm for fast rescheduling thermal generation is presented. The savings in computational times are brought about by the introduction of two new techniques: the variable truncation dynamic programming and the limitation of the solution space to be searched. Several examples on a 20 machine system are used to illustrate the application of the algorithm and to show that optimal solutions are obtained at significantly reduced computational times. View full abstract»

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  • A Decomposition Approach to Preventive Planning of Reactive Volt Ampere (VAR) Source Expansion

    Page(s): 72 - 77
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    This paper presents a two-level approach for determining the minimum cost expansion pattern (location and size) of new reactive compensation sources that would ensure steady-state secure operation of large scale power systems not only under a given set of operating conditions for the intact system, but also under contingency conditions. This preventive planning problem is decomposed into a var dispatch (Level 1) problem and a var allocation (Level 2) problem which are related together using the generalized Benders decomposition. The methodology has been implemented in a prototype computer package which can handle power systems with up to 1500 buses. Results of testing the package with practical power systems of different sizes and characteristics are presented. View full abstract»

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  • Power Mismatch Detection and Estimation for Emergency Control

    Page(s): 78 - 84
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    This paper considers one aspect of the problem of the control of power systems in the emergency state exhibiting a severe viability crisis characterized by large load/generation imbalances. The proposed centralized control strategy resuls in structural action on demand/generation and is based on fast and decentralized detection and estimation of the power imbalance in the areas of an interconnected power system. Low order dynamic observers are proposed to estimate the magnitude of the imbalance using locally available measurements of frequency and tie-line power flows. Guidelines for the design of the proposed observer are presented and illustrated on the practically important example of an interconnected power system model. View full abstract»

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  • The New National Control Centre, Ireland

    Page(s): 85 - 91
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    The new National Control Centre for the Electricity Supply Board (ESB), Ireland, currently undergoing site commissioning, will be in operation in September 1986. The Control Centre will control a single 2200 MW island network. The control centre is being supplied under a supply contract with Landis & Gyr, Zug, Switzerland. There is a high degree of customer participation and emphasis is laid on customer interfacing. The central hardware comprises a dual main 32-bit computer system with Virtual Memory Operating System, four dual front-end processors and four display processors. Remote Terminal Units communicate with the Control Centre on a private communication network, mostly Microwave and Power Line Carrier. This paper describes the control centre in a general way with emphasis on contractual arrangements, customer involvement and testing procedures. View full abstract»

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  • Low Frequency Oscillations in Longitudinal Power Systems: Experience with Dynamic Stability of Taiwan Power System

    Page(s): 92 - 98
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    Sustained low frequency oscillations have been observed in Taiwan power system which is of longitudinal structure. It is the purpose of this paper to examine the various factors affecting the damping characteristics of these oscillations which caused dynamic instability problem in the operation of Taiwan power system. It is observed that the amount of power flow on the EHV transmission line and the characteristics of load have a significant effect on the damping of the system while the speed-governing system and the gain of automatic voltage regulator have only a minor one. Detailed investigation using both the frequency domain and time domain approaches also reveals that power system stabilizers can be employed as an effective means for improving dynamic stability of Taiwan power system. View full abstract»

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  • Discussion

    Page(s): 99 - 100
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  • A Fast Production Scheduler for Generation Expansion Planning in a Hydro-Thermal System

    Page(s): 101 - 107
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    A fast production scheduling algorithm suitable for generation expansion studies is described in this paper. It can handle several independent rivers, thermal plants, pumped storage plants, import, export, and internal non-firm markets. Inflows and load are deterministic and a one-reservoir limit is imposed on each river. The scheduling problem is formulated as a generalized network problem which is efficiently solved by an adaption of the simplex method. The algorithm is part of a program developed by Hydro-Québec to conduct preliminary evaluations of alternative expansion plans. The program and the scheduling algorithm are presented. View full abstract»

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  • An Approach to Conservation and Load Management Economic Analysis

    Page(s): 108 - 112
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    This paper discusses a technique used by Northern States Power Company for the evaluation of conservation and load management alternatives. The technique involves examining the cumulative present worth of the avoided costs net of revenue effects due to proposed programs. The factors considered include annual revenue requirements for generation operation and maintenance, generation capacity, generation fuel inventory, transmission, distribution system, annual production cost, and revenue impact of the strategy being considered. The cumulative present worth of these factors when compared to base case alternatives yields an economic "figure of merit" for judging conservation and load management strategies. View full abstract»

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  • Long Term Power System Simulation for Real-Time Training with a Reduced Size Program

    Page(s): 113 - 118
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    This paper presents a brief description and discussion of the results of a reduced size computer program for long-term power system simulation. It includes detailed models of a hydro, a coal-fired and a pressurized water reator (PWR) generation plant. Typical data taken from operating records have been used. Since the simulation runs faster then real-time, the program can be used as a power system simulator operator training. View full abstract»

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  • A Unique Method of Evaluation of System Damping in Simulations of Large Power Systems

    Page(s): 119 - 122
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    This paper documents a practical numerical method of evaluating damping of slow oscillations in computer simulations of large power systems. This technique has been tested and improved over the last two years. The damping coefficients can assist in evaluation of acceptable transfer limitations. The proposed method also provides a means to evaluate the sensitivity of various transfer path loadings and transmission and generation facility contingencies on system damping. 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
Antonio J. Conejo
The Ohio State University