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J. W. Skooglund

Bio: J. W. Skooglund is an academic researcher from Westinghouse Electric. The author has contributed to research in topics: Voltage regulator & Electric power system. The author has an hindex of 8, co-authored 9 publications receiving 331 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the transient performance of power systems is studied using large computer programs with representation of individual unit governing systems included, but detailed representation of hydrogovernors is not usually available, but rather, an equivalent transfer function is employed.
Abstract: In studying transient performance of power systems, large computer programs are now used with representation of individual unit governing systems included. Detailed representation of hydrogovernors is not usually available, but, rather, an equivalent transfer function is employed.

117 citations

Journal ArticleDOI
TL;DR: In this paper, the transient and dynamic stability of the Peace River 500kV transmission system was studied with a new digital computer program, which included direct and quadrature machine axes, saturation, excitation, and governing systems.
Abstract: The transient and dynamic stability of the Peace River 500-kV transmission system was studied with a new digital computer program. The detailed representation included direct and quadrature machine axes, saturation, excitation, and governing systems. Stability is maintained following faults by employing a braking resistor and additional stabilizing signal to the generator excitation system.

99 citations

Journal ArticleDOI
TL;DR: In this article, a high initial response excitation system retaining the advantages of the absence of commutators, collectors and brushes while responding with the speed of an electronic exciter has been developed.
Abstract: A high initial response excitation system retaining the advantages of the absence of commutators, collectors and brushes while responding with the speed of an electronic exciter has been developed. Calculated performance of this system has been firmed by factory tests. With the exciter loaded, the excitation system achieved 95% of ceiling voltage in 0.016 seconds following a 10% step change in the voltage regulator sensing signal. In addition to the high initial response capability, the excitation system also includes supplementary feedback control for improving the small signal dynamic performance characteristic of the exciter. With the addition of feedback, the effective exciter time constant is reduced by a factor of thirty compared to its value without feedback. The tests confirm that low time constants and high initial response can readily be attained in an excitation system which includes a brushless exciter with non-controlled rectifiers.

45 citations

Journal ArticleDOI
TL;DR: In this paper, switching surge tests performed on simulated tower-insulator systems representative of possible 345-and 500-kV transmission line designs were performed so that line design parameters could be estimated for a specific value of switching surge overvoltage.
Abstract: Switching surge tests performed on simulated tower-insulator systems representative of possible 345- and 500-kV transmission line designs were performed so that line design parameters could be estimated for a specific value of switching surge overvoltage. Switching surge studies of the Southern California Edison Company (SCE) 500-kV transmission system dictated that the switching surge withstand strength for wet conditions should be 1065 kV. From the design-application curves, the center phase of the SCE 500-kV transmission tower-insulator system was designed to have a 12-foot 8-inch minimum horizontal strike distance and 27 insulators used in a 90-degree V-string configuration. Full-scale tower tests confirmed the switching surge design criteria.

23 citations

Journal ArticleDOI

16 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, automatic generation control of an interconnected hydrothermal system in continuous-discrete mode using conventional integral and proportionalintegral controllers has been considered for the thermal and hydro plants.
Abstract: This paper deals with automatic generation control of an interconnected hydrothermal system in continuous-discrete mode using conventional integral and proportional-integral controllers. Appropriate generation rate constraint has been considered for the thermal and hydro plants. The hydro area is considered with either mechanical or electric governor and thermal area is considered with either single or double reheat turbine. Performances of mechanical governor, electric governor, and single stage reheat turbine and two stage reheat turbine on dynamic responses have been explored. Further, selection of suitable value of speed regulation parameter R and sampling period has been investigated. System performance is examined considering 1% step load perturbation in either thermal or hydro area.

323 citations

Book
01 Jan 2001
TL;DR: This book discusses the design Principles of Single-Input Single-Output Nonlinear Control Systems and their applications in Electric Power Systems and Nonlinear Excitation Control of Large Synchronous Generators.
Abstract: Preface. 1. Introduction. 2. Basic Concepts of Nonlinear Control Theory. 3. Design Principles of Single-Input Single-Output Nonlinear Control Systems. 4. Design Principles of Multi-Input Multi-Output Nonlinear Control Systems. 5. Basic Mathematical Descriptions for Electric Power Systems. 6. Nonlinear Excitation Control of Large Synchronous Generators. 7. Nonlinear Steam Valving Control. 8. Nonlinear Control of HVDC Systems. 9. Nonlinear Control of Static Var Systems. 10. Nonlinear Robust Control of Power Systems. Index.

258 citations

Book
08 Oct 2008
TL;DR: Stochastic Security Analysis of Electrical Power Systems and Power System Transient Stability Analysis and Small-Signal Stability Analysis of Power Systems.
Abstract: Mathematical Model and Solution of Electric Network.- Load Flow Analysis.- Stochastic Security Analysis of Electrical Power Systems.- Power Flow Analysis in Market Environment.- HVDC and FACTS.- Mathematical Model of Synchronous Generator and Load.- Power System Transient Stability Analysis.- Small-Signal Stability Analysis of Power Systems.

248 citations

Journal ArticleDOI
TL;DR: In this article, the authors have tried to broadly categorize the research work done so far on the basis of hydro plant model development and its controller design under different sections, and have found a substantial number of relevant research papers can be found on the plant modeling, design aspects of control methodologies and their performance study.
Abstract: The recent increased number of black outs in the power system has been largely due to growing competition and deregulation among the power industry. Power systems are complex nonlinear systems and often exhibit low frequency electro-mechanical oscillations due to insufficient damping caused by severe operating conditions. This needs an advanced modeling and control techniques for effective control of power plants. In case of hydroelectric plant the hydro turbine is a non-linear, non-stationary multivariable system whose characteristics vary significantly with the unpredictable load on it and this presents a difficulty in designing an efficient and reliable controller. A conservatively designed control fails to perform as expected. Keeping this in mind, hydro plant control is an application area with an interesting set of problems for control engineering people. Mainly some of these problems focus towards regulation of turbine with large load variation in the power system. These problems have not been adequately solved and continue to pose challenges to the control community. In this review paper, the authors have tried to broadly categorize the research work done so far on the basis of hydro plant model development and its controller design under different sections. A substantial number of relevant research papers can be found on the plant modeling, design aspects of control methodologies and their performance study.

242 citations