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The Proceedings of the Twenty-First Annual North American Power Symposium

9-10 Oct. 1989

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  • Proceedings of the Twenty-First Annual North-American Power Symposium (Cat. No.89TH0284-0)

    Publication Year: 1989
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  • Analysis of voltage collapse in power systems

    Publication Year: 1989, Page(s):151 - 160
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors extend the singular value decomposition (SVD) method for detecting voltage collapse to include voltage dependent loads and Q-limited generation sources. They also propose a new indicator based on SVD, the condition number, which is more sensitive than the minimum singular value. Numerical examples and verification on the six-bus and 14-bus systems are given View full abstract»

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  • Determination of transient stability constrained line flow limits: an application of linearized techniques for the transient energy function method

    Publication Year: 1989, Page(s):142 - 150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    An effort is made to determine how line flow changes affect the robustness of the power system using the energy margin sensitivities to power generation shifts and power flow distribution factors. A method to obtain stability constrained line flow limits is proposed. The major difference between this research work and other research in transient energy function sensitivity techniques for line flow... View full abstract»

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  • An expert system and dynamic programming hybrid for unit commitment

    Publication Year: 1989, Page(s):2 - 11
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The authors propose a hybrid expert system/dynamic programming program for the solution of the unit commitment problem. The three concerns of schedule feasibility, program flexibility, and optimality are not satisfactorily achieved by either purely heuristic or numerical methods. A program which couples an efficient numerical optimization program with an expert system which can encompass the heuri... View full abstract»

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  • Invariant manifolds and start-up dynamics of induction machines

    Publication Year: 1989, Page(s):129 - 138
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Time-scale properties are investigated for several induction machines with sizes ranging from 3 to 6000 hp. Whereas third-order models neglecting stator transients are relatively accurate, first-order models should not be used for machines of sizes greater than 250 hp unless higher-order corrections are used. Exact invariant manifolds are derived in the case of zero stator resistance and constant ... View full abstract»

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  • A coordinated adaptive stabilizer for multimachine power systems

    Publication Year: 1989, Page(s):175 - 184
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The speed governor and excitation control functions are rarely incorporated into existing power plant computer control structures. However, current research trends indicate a growing interest in the integration of these functions into the computer control hierarchy. To this end, several control schemes have been proposed for replacing the main governor and excitation control functions as well as t... View full abstract»

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  • Application of expert system for improved contingency analysis and optimal correction

    Publication Year: 1989, Page(s):33 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An expert system technique has been developed for improved power system contingency identification and classification and for immediate corrective measures. The application of the expert system to contingency selection aids in easily partitioning the contingencies so that only harmful cases, which are also further classified, are considered, thereby reducing the computational burden. The expert sy... View full abstract»

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  • Harmonic analysis of the repulsion motor controlled via rotor triac

    Publication Year: 1989, Page(s):60 - 69
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors investigate the harmonic contents of the stator current, rotor current, and rotor voltage of a repulsion motor controlled by a triac in the rotor circuit. The waveforms of these variables were generated and then analyzed numerically for their harmonic content using a Fourier series subroutine. The results were validated by comparison with experimental results. The analyses show that le... View full abstract»

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  • Time domain analysis of induction motor starting transients

    Publication Year: 1989, Page(s):120 - 128
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A simplified time-domain analysis based on the equivalent circuit, differential equations and the Laplace transform is presented for the calculation of the starting current of an induction motor. The model provides a closed-form solution to the transient starting inrush current. The solution is realized by the superposition of natural and forced responses of the starting current components. The ca... View full abstract»

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  • Computation of ground current density profiles of unipolar DC corona

    Publication Year: 1989, Page(s):222 - 230
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A novel approach for computing ground-level current density profiles of unipolar DC corona is described. An analysis is performed to study the influence of Deutsch's assumption (i.e. that the space charge affects only the magnitude and not the direction of the electric field) on the ground-level current density distributions. The distortion of the ion trajectories caused by the corona-generated sp... View full abstract»

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  • Achieving distribution feeder reliability using benefit/cost ratio analysis

    Publication Year: 1989, Page(s):254 - 261
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The authors describe a computer-based method for evaluating the benefit/cost ratios associated with projects for improving distribution feeder reliability. A reliability benefit is expressed in terms of a change in the feeder average interruption frequency index (FAIFI) of the feeder average interruption duration index (FAIDI). Cost is expressed in terms of the levelized annual revenue requirement... View full abstract»

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  • Power system stabilizer design for maximum stability margin

    Publication Year: 1989, Page(s):168 - 174
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    A novel method for stability margin maximization is presented. The study is formulated as a design parameter optimization problem, with specific application to power system stabilizers. This method is based on necessary and sufficient conditions required by stability matrices, which are included as additional constraints to the nonlinear optimization problem. The objective function uses eigenvalue... View full abstract»

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  • A knowledge-based system to develop a plan of action for eliminating transmission line overloads

    Publication Year: 1989, Page(s):21 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    To avoid severe outages of major transmission facilities and loss of generation under emergency situations, a knowledge-based system has been built to develop a plan of action for eliminating multiple transmission line overloads within an interconnected power system. The primary corrective strategies for alleviating excessive loading of transmission lines are to shift generation and to shed loads.... View full abstract»

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  • Converter transformer resonant frequencies: measurements and prediction equations

    Publication Year: 1989, Page(s):50 - 59
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The authors report studies carried out to analyze the first resonant frequencies (natural frequencies) of converter and substation transformers. Many conditions are represented: single- and three-phase transformers, different core designs, high-voltage and low-voltage windings, and different winding types. Prediction equations based on the measurement data are reported and discussed View full abstract»

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  • Pitfalls in least cost planning

    Publication Year: 1989, Page(s):78 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An attempt is made to identify, for the casual or new user, the supply-side, demand-side, and economic pitfalls to be avoided when applying least-cost concepts to electric generation capacity planning. Suggestions for avoiding many pitfalls are provided. Also, the author identifies factors that one should find, or want to question if not found, in a least-cost planning study View full abstract»

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  • Multi-state power system optimization

    Publication Year: 1989, Page(s):95 - 104
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    An overall control strategy for power flow optimization is defined. In normal and alert states, reactive power control variables are used to minimize transmission losses and improve the reactive power security level, respectively. In the emergency state, any type of constraint violation is eliminated by using reactive power control variables to eliminate voltage violations and real power control v... View full abstract»

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  • Static and dynamic models of induction motors

    Publication Year: 1989, Page(s):110 - 119
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The authors describe the modeling of squirrel cage induction motors and the derivation of steady-state and dynamic models that can be utilized in harmonic penetration studies. They present the results of laboratory testing of three-phase and single-phase induction motors to estimate these static and dynamic models. Such models are extremely useful in: identifying effective control strategies to en... View full abstract»

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  • A three-phase reactive current measurement technique suitable for automation

    Publication Year: 1989, Page(s):212 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The author describes a technique for measuring the reactive current in three-phase circuits. The clock frequency for synchronizing and timing is produced from supply voltage signals. The line current is sensed with the help of Hall effect transducers. The analog value of the reactive current is measured at the zero crossing of the voltage wave using a sample-and-hole circuit. The signal is then co... View full abstract»

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  • Design of optimal modulation controllers for AC/DC systems

    Publication Year: 1989, Page(s):201 - 204
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    Optimal modulation controllers for a multiarea AC/DC system designed by changing the weighting matrix Q of the quadratic performance criterion are presented. The controller assigns the modes corresponding to electromechanical oscillations at the desired location on the real axis. Dynamic simulations of the linearized AC/DC system show significant improvement in the dynamic performance of ... View full abstract»

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  • A knowledge based approach to evaluate storm related outages in power distribution systems

    Publication Year: 1989, Page(s):246 - 253
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    A computer-assisted intelligent storm outage evaluator (CAISOE) featuring real-time status information and system operators' heuristics is proposed. The CAISOE system can detect single and multiple faults of any type on any section of the distribution system, and can serve as an offline consultation system to the distribution system operators. At the outset, binary voltage sensors capable of trans... View full abstract»

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  • The application of a locally parameterized continuation technique to the study of steady state voltage stability

    Publication Year: 1989, Page(s):161 - 167
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    In the design and operation of heavily loaded power systems, a power-versus-voltage (P-V) profile is useful for evaluating the steady-state voltage stability limits of a system under both normal and postcontingency operating conditions. A load flow program is commonly used to calculate the points that compose the P -V curve. The authors show how the capabilities... View full abstract»

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  • Daily power system fuel optimization using a network flow algorithm

    Publication Year: 1989, Page(s):12 - 20
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The problem of minimizing the cost of producing electric power has become more important and more difficult with the fluctuations in fuel prices and increasing complexity of the fuel market. The authors describe the development of a computational tool to aid operations planners in scheduling fuel contracts. A network flow algorithm called the out-of-kilter algorithm has been implemented to find th... View full abstract»

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  • Simultaneous fault simulation using the generalized method of fault analysis

    Publication Year: 1989, Page(s):188 - 191
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The author describes a procedure for simultaneous fault calculations using the generalized method of fault analysis. This approach, which can handle various faults without any restrictions on fault types, total numbers, or location, serves as the foundation of new fault analysis programs which are replacing the traditional short-circuit programs at various utility companies. The fundamental differ... View full abstract»

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  • The use of PSpice as a power system harmonics analysis

    Publication Year: 1989, Page(s):40 - 49
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors describe the use of PSpice to analyze the harmonic responses of two power system networks. The same networks were also analyzed for harmonic responses by using V-HARM, a software package specifically designed to simulate power system harmonics. The results obtained from the PSpice and V-HARM programs were compared and found to be almost identical. It is suggested that PSpice could be u... View full abstract»

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  • Effect of nonlinear load on design of dynamic compensator for reactive power modulation in AC/DC power system

    Publication Year: 1989, Page(s):70 - 75
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The authors investigate the effect of a nonlinear load on the parameters of a dynamic compensator for reactive power modulation using a static VAr compensator. The values of gain and zero of the dynamic compensator, which assign the same complex-conjugate eigenvalues corresponding to electromechanical oscillations, are plotted at different values of load characteristics. Linear system simulations ... View full abstract»

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