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Allan L. Blythe

Bio: Allan L. Blythe is an academic researcher from Westinghouse Electric. The author has contributed to research in topics: Transmission system & Exciter. The author has an hindex of 4, co-authored 4 publications receiving 145 citations.

Papers
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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 paper, the authors conducted field tests to confirm that the equipment would behave as forecast and to provide confirmation of the assumptions and techniques employed in the use of the digital computer program.
Abstract: Stability studies were made[1] on a digital computer of the British Columbia Hydro and Power Authority Peace River System which indicated the advisability of using high-speed excitation with a stabilizing feedback. Consideration of the novelty of this technique led to a decision to conduct field tests to confirm that the equipment would behave as forecast. In addition, these tests could provide confirmation of the assumptions and techniques employed in the use of the digital computer program. The tests were made on a small hydroelectric station connected to the main system by a relatively weak line. Single phase to ground faults were applied to the station 132-kV bus. The results of these tests and of computer simulations are shown.

31 citations

Journal ArticleDOI
TL;DR: In this article, the application of thyristor converters to the excitation of large generators as shunt connected solid-state exciters is described and some important exciter design details are given.
Abstract: The application of thyristor converters to the excitation of large generators as shunt connected solid-state exciters is described. Considerations important during the planning stage are discussed and some important exciter design details are given. The importance of the topic, control of power system stability by adjustment of generator excitation, is highlighted by reference to many other papers.

10 citations

Patent
06 Apr 1967

8 citations


Cited by
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Journal ArticleDOI
TL;DR: An attempt is made to apply a certain class of optimal control theory to obtain an optimal controller to improve the dynamic response of a power system.
Abstract: In recent years important research has been done in the area of system optimization by control engineers. Many theoretical results have been published but application examples have mainly been on low-order systems. An attempt is made to apply a certain class of optimal control theory, known as the state regulator problem, to obtain an optimal controller to improve the dynamic response of a power system. The system differential equations are written in the first-order state variable form. A cost functional is then chosen, and the matrix Riccati equation is solved. Puri's and Gruver's method is applied for the numerical computation, and the system is made initially stable by shifting the system eigenvalues.

218 citations

Journal ArticleDOI
TL;DR: In this paper, a new method is developed to determine the weighting matrix Q of the performance function in conjunction with a left shift of the dominant eigenvalues as far as the practical controllers permit.
Abstract: For an optimal linear regulator design a performance function of the quadratic form must be chosen. The question arises of how to decide the weighting matrix Q of the performance function. A new method is developed in this paper to determine Q in conjunction with a left shift of the dominant eigenvalues as far as the practical controllers permit. The method is then applied to the optimal control design of a typical power system. Three cases are investigated, the first with an optimal excitation control uE, the second with optimal governor controls uG and uG, with and without the dash-pot, and the third with uE plus uG control. The stabilizing signals thus obtained are given nonlinear tests on the same power system. It is found from the results that the optimal controls are more effective than conventional excitation control, that the optimal governor control without dash-pot is just as good as the optimal excitation control, and that the optimal uE plus uG control is the best way to stabilize a power system.

183 citations

Journal ArticleDOI
TL;DR: In this article, the dynamic and stability properties of wind turbine generators connected to power systems are discussed, as well as various schemes for torsional damping such as speed sensitive stabilizer and blade pitch control.
Abstract: This paper describes the dynamic and stability properties of wind turbine generators connected to power systems. Both synchronous and induction generators are considered. A comparison is made between wind turbines, steam, and hydro units. The unusual phenomena associated with wind turbines are emphasized. The general control requirements are discussed, as well as various schemes for torsional damping such as speed sensitive stabilizer and blade pitch control. Interaction between adjacent wind turbines in a "wind farm" is also considered.

143 citations

Journal ArticleDOI
TL;DR: In this article, a 1400MW dynamic braking resistor installed at the Bonneville Power Administration's (BPA) Chief Joseph Substation enhances system stability in the Pacific Northwest (PNW).
Abstract: A 1400-MW dynamic braking resistor installed at the Bonneville Power Administration's (BPA) Chief Joseph Substation enhances system stability in the Pacific Northwest (PNW). The capacity of the Pacific Northwest-Southwest (PNW-SW) Intertie is increased by the use of resistor braking for faults in the PNW. The need of and benefits from the use of the brake are discussed. The physical and electrical characteristics of the brake are described as well as the control system for its operation.

122 citations

Journal ArticleDOI
TL;DR: In this article, a comparison is made of a lower-order linear model and a high-order non-linear system modelled as a single machine-infinite bus as well as multi-machine systems.
Abstract: The stabilization of power systems with excitation control using speed or power signals has been very well developed,1-6 while the application of optimal control to power system stability study is relatively new.7 Both are based on linear models. In this paper, a comparison is made of these two techniques. Signals derived from a lower order linear model are tested on a high order non-linear system modelled as a single machine-infinite bus as well as multi-machine systems.

112 citations