Proceedings of the Twenty-Second Annual North American Power Symposium

15-16 Oct. 1990

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  • Proceedings of the Twenty-Second Annual North American Power Symposium (Cat. No.90TH0343-4)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (374 KB)
    Freely Available from IEEE
  • An expert system for contingency analysis in power systems

    Publication Year: 1990, Page(s):373 - 380
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    An expert system is developed to determine the steady state security of a power system after a contingency. Line, transformer and generator outages are considered. For any load in the system, overloaded branches are determined by comparing the system load to three load levels closest to the actual system load and using generator shift or branch outage distribution factors. The expert system, in co... View full abstract»

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  • Effects of under-load tap changer (LTC) on power system voltage stability

    Publication Year: 1990, Page(s):298 - 303
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The effect of load tap changer (LTC) action on a transformer's adjusted side voltage (usually the secondary side of step-down transformers) is evaluated when the tap position on LTC is raised (lowered) to increase (decrease) the adjusted side voltage. The effects of other measures such as series and shunt compensation and their combination with LTCs are also evaluated. A static representation mode... View full abstract»

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  • Corrosion and steel grounding

    Publication Year: 1990, Page(s):162 - 170
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Based on the National Bureau of Standards statistical data on the corrosion of steel (M. Romanoff, 1957), an equation is developed to estimate the corrosion rate of underground steel that varies with soil resistivity, pH value, moisture and aeration. This formula, together with IEEE Standard 80-1986, is used in the design of steel grounding. formulae are also discussed on how to design proper cath... View full abstract»

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  • An algorithm of the harmonics on traction power system of the electrified railway

    Publication Year: 1990, Page(s):78 - 81
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors explore harmonic calculations for Chinese electrified railway systems. One of the branches of the electrified railway power system in operation was emulated and calculated with special purpose software for analyzing harmonic currents. The multiple harmonic sources and the asymmetry of the system make the harmonic analysis complicated. The three-phase power system is converted into a si... View full abstract»

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  • Transient voltage dip analysis using the transient energy function method

    Publication Year: 1990, Page(s):264 - 273
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    It is shown that the transient energy function (TEF) method provides a fast approximate approach to voltage dip computations. The TEF method is used to predict the stability of a power system after a disturbance has occurred. The results of application of the technique to test power systems confirmed that the voltage dips predicted by the TEF method compare well with the values from time domain si... View full abstract»

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  • A pattern analysis approach for topology determination, bad data correction and missing measurement estimation in power systems

    Publication Year: 1990, Page(s):363 - 372
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The authors propose a novel methodology for the combined solution of the topological identification, observability analysis and bad data processing problems in power systems. The idea is to provide, in a very fast way, a reliable input database for the state estimator, without interacting with it. The solution is based on a pattern analysis approach. An efficient framework for solving data acquisi... View full abstract»

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  • Load frequency control of an inter-connected system with DC tie-lines and AC-DC parallel tie-lines

    Publication Year: 1990, Page(s):390 - 395
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The authors examine the effect of DC tie-lines and AC-DC parallel tie-lines in a multi-area interconnected system consisting of hydro and thermal generation units provided with conventional integral controllers. Separate studies were made for each case and results are compared with a pure AC tie-line multi-area system. A conventional integral controller is used for all the studies demonstrated. Th... View full abstract»

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  • A fast and reliable decoupled load flow method in rectangular coordinates

    Publication Year: 1990, Page(s):94 - 101
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors present a novel version of the fast decoupled load flow method in rectangular coordinates. The decoupling procedure uses a flat start and is based on the second-order load flow method, which is decoupled by suitable manipulations. There are no simplifications in the derivation of the method and the resulting set of equations has the same accuracy as the original expressions. To evaluat... View full abstract»

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  • Robust design of dynamic compensator for HV AC power system

    Publication Year: 1990, Page(s):2 - 7
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors present a method to design a robust dynamic compensator for reactive power modulation to improve the dynamic performance of high voltage AC power systems. The effect of nonlinear load on parameters of a dynamic compensator for reactive power modulation using a static VAr compensator (SVC) is investigated. The values of gain and zero of the dynamic compensator, which assign the same com... View full abstract»

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  • Microcomputer-based database management techniques for pulsed power and other system studies

    Publication Year: 1990, Page(s):112 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A microcomputer-based database management system developed to meet the objectives of database access and processing for certain analysis software is described. It uses a standard database management language to relate data for power flow, transient and dynamic analysis, bus reduction, and the electromagnetic transients program (EMTP) for large-system analysis. The authors demonstrate how such a so... View full abstract»

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  • Building the world's largest Tesla coil-history and theory

    Publication Year: 1990, Page(s):128 - 135
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A plan to design, build, and test the world's largest Tesla coil power transformer is discussed. The analysis will be performed by using the program TCTUTOR by J. Corum et al. (1988) with modifications. Power MOSFETs will be used to excite the coil. Hall effect sensors will be used to measure current waveforms and electric field sensors will be used to monitor voltage waveforms. Optical fibers wil... View full abstract»

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  • Computational enhancements to the power system state estimator at harmonic frequencies

    Publication Year: 1990, Page(s):44 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A study on the application of estimation theory to predict harmonic bus voltages and line currents which cannot or are not measured directly is proposed. The methodology is based on measurements, state estimators, and harmonic system modeling. A hybrid of quadratic and nonquadratic criterion-based techniques utilizing singular value decomposition is used with a feasible application to large-scale ... View full abstract»

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  • Study of transmission line magnetic fields

    Publication Year: 1990, Page(s):222 - 231
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The authors present a review of magnetic field calculations associated with power frequency 3, 6, and 12-phase transmission lines. A computer program implemented using an IBM PC-XT is described briefly. The interactive program allows the user to calculate the two-dimensional electric and magnetic field parameters at any point near transmission lines. Plotting and mapping features are also availabl... View full abstract»

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  • Least square approach for voltage control optimization

    Publication Year: 1990, Page(s):293 - 297
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The author describes a procedure for determination of optimum voltage control using the quadratic optimization technique based on the least squares method. The approach is capable of handling generalized optimization problems with the number of variables greater/equal, less than number of constraints. These constraints can be linear or nonlinear but can be modeled as quadratic forms of voltage. Al... View full abstract»

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  • Dynamic static VAr compensation and stability of HVAC-An outlook and trend

    Publication Year: 1990, Page(s):22 - 32
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Static VAr compensators are reviewed for their application in transmission line compensation and load compensation. Emphasis is given to the application of thyristor controlled reactors and thyristor switched capacitors. After a quick review of the application of static VAr compensators, a detailed theoretical analysis of the reactive power requirement is made. A mathematical model of the compensa... View full abstract»

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  • Design and development of a line voltage detector

    Publication Year: 1990, Page(s):155 - 161
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A voltage detector to determine whether a line is energized or not was designed and developed into a prototype. A voltage proportional to the line-to-neutral voltage is filtered through a third order bandpass filter, to obtain the triggering signal for the detector. The prototype was tested in the laboratory using a 1.5 kVA, 120/7200 V, single phase distribution transformer. the low voltage side o... View full abstract»

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  • Harmonics in variable speed fan systems

    Publication Year: 1990, Page(s):68 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30° pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the... View full abstract»

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  • Effect of geomagnetic-induced-current on power grids and communication systems: a review

    Publication Year: 1990, Page(s):251 - 262
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The authors provide an up-to-date engineering review on the effect of geomagnetic-induced-current (GIC) on power systems and apparatus. The topics dealt with are effects on power systems; static VAr compensation and harmonic distortion; mitigation of GIC in power systems; measurements and instrumentation; effect of GIC on communication systems; and strategies for developing immunity from geomagnet... View full abstract»

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  • Speed control of series motors by means of thyristor bridges

    Publication Year: 1990, Page(s):428 - 434
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The behavior of a single-phase gate controlled thyristor bridge supplying a R-L network is digitally simulated. The results are compared with an experiment on the same system to verify the correctness of the digital model. A series motor is digitally simulated together with the digital model of the thyristor bridge. Speed control of the series motor is achieved by controlling the gate signals to t... View full abstract»

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  • Phase-to-ground switching transients in EHV systems

    Publication Year: 1990, Page(s):203 - 210
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The author outlines the effects of unequal pole closure of circuit breakers on the magnitudes of phase-to-ground overvoltages. A model of a short section of a 500 kV line is used. Results show that the mean value of the phase-to-ground voltage increases in both directions away from the zero switching angle where it shows a minimum. The minimum is more distinct in the case of sequential switching t... View full abstract»

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  • Performance evaluation of a subnetwork solution for contingency selection

    Publication Year: 1990, Page(s):348 - 362
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors examine the computational efficiency of subnetwork solutions. A statistical approach is used to evaluate the performance of the subnetwork solution on several systems. The authors suggest that the efficiency of the subnetwork solution as compared to the full solution depends on the contingency type and the system size. For convenience, the sparsity-oriented subnetwork solution with fas... View full abstract»

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  • Evaluation of methodologies for shunt VAr planning

    Publication Year: 1990, Page(s):381 - 389
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Two methods are developed and evaluated for shunt VAr planning. These methods are capable of sizing and siting shunt VAr at optimum cost and with greater reliability. The methods utilize the generalized Benders decomposition (GBD) technique to decompose the VAr problem into two subproblems. The first level of the problem solves an optimal power flow problem by scheduling control variables includin... View full abstract»

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  • On underfrequency load shedding schemes

    Publication Year: 1990, Page(s):172 - 180
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The author discusses some of the factors which must be considered for testing an underfrequency load shedding scheme. Fault simulation and system separation due to faults or out-of-step conditions must be represented. This is necessary for analysis of generator behavior within the system during the abnormal conditions. The program must be capable of simulating the behavior of distance and out-of-s... View full abstract»

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  • A comparison of alternative transforms for electric power engineering applications

    Publication Year: 1990, Page(s):84 - 93
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    It is conjectured that mathematical transform methods may be deserving of increased awareness in systems analysis in general, and power quality calculations in particular, due to their favorable convolution property when studying linear, time-invariant systems. Because certain transforms have associated with them a fast algorithm for digital computation, frequency domain analysis tools can substan... View full abstract»

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