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Richard T. Byerly

Bio: Richard T. Byerly is an academic researcher from Westinghouse Electric. The author has contributed to research in topics: Modal analysis & Voltage regulator. The author has an hindex of 2, co-authored 5 publications receiving 50 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the theoretical basis for normal mode analysis of power systems is presented, and methods for calculating normal modes and mode shapes are described, with illustrations to small systems, and techniques for simulating normal modes for the analysis of mode damping are shown.
Abstract: A power system of n generators has n-1 normal modes of oscillation. If any of these modes is poorly damped, persistent or disruptive oscillations may occur. Knowledge of the normal modes and mode shapes of a specific system provides important insight into its dynamic behavior. Calculation of normal modes and mode shapes yields data that permits a systematic approach to dynamic stability Studies. The theoretical basis for normal mode analysis of power systems is presented. Methods for calculating normal modes and mode shapes are described, with illustrations to small systems. Techniques for simulating normal modes for the analysis of mode damping are shown. A companion paper describes the application of modal analysis to a large area in the MAPP system.

31 citations

Journal ArticleDOI
TL;DR: The use of an auxiliary damping signal into the voltage regulator may become especially important for machines that are inherently lightly damped as mentioned in this paper, and the application of static exciters to waterwheel generators requires an awareness of these possible changes.
Abstract: It is generally accepted that a high-performance excitation system may reduce the effective internal damping of a synchronous machine. Alternately, studies and field tests indicate that a fast-acting excitation system offers the best opportunity for increased damping through the use of an auxiliary signal into the voltage regulator. The application of static exciters to water-wheel generators requires an awareness of these possible changes in machine damping. The use of an auxiliary damping signal into the voltage regulator may become especially important for machines that are inherently lightly damped.

16 citations

Patent
22 Oct 1965

2 citations

Journal ArticleDOI
TL;DR: In this article, a method for analyzing the results of stability calculations using generator transfer admittances to calculate power flows between generators is presented, where the equations for power flow from any generator to all other generators can be used to define an equivalent system bus unique to that generator.
Abstract: A method is presented for analyzing the results of stability calculations using generator transfer admittances to calculate power flows between generators. It is shown that the equations for power flow from any generator to all other generators can be used to define an equivalent system bus unique to that generator. Functions which indicate the capability of a generator to maintain synchronism are presented with illustrations of their application.

1 citations

Patent
07 Aug 1962

1 citations


Cited by
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Proceedings ArticleDOI
05 Apr 2005
TL;DR: In this paper, the authors discuss the causes of power system instability and the importance of fast fault clearing, including synchronizing and damping torques, using the k-constant model to explain the relationships among the following: small signal stability, high impedance transmission lines, line loading and high gain, fast acting excitation systems.
Abstract: This paper discusses the causes of power system instability and the importance of fast fault clearing. The k-constant model is used to explain the relationships among the following: small signal stability, high impedance transmission lines, line loading and high gain, fast acting excitation systems. Various types of power system instability, utilizing both mathematical and practical approaches, are covered. Transient stability is discussed, including synchronizing and damping torques. The power angle curve is used to illustrate how fault clearing time and high initial response excitation systems can affect transient stability. In the past number of years, "power system stability" has become an increasingly popular term used in generation and transmission. The sudden requirement for power system stabilizers for use with new and existing excitation equipment has created much confusion about their applicability, purpose, and benefit to the power system. This paper will discuss the fundamentals of the power system stabilizer and its effectiveness in the system. An explanation will be provided concerning the various types of power system stabilizers and the benefit of some types over others. Lastly, the paper will address regulatory commission guidelines identified by NERC that will impact generation connected to the transmission system.

100 citations

Journal ArticleDOI
24 Jun 2007
TL;DR: In this article, the authors discuss power system instability and the importance of fast fault clearing performance to aid in reliable production of power, including synchronizing and damping torques, and the power angle curve is used to illustrate how fault clearing time and high initial response excitation systems can affect transient stability.
Abstract: This paper discusses power system instability and the importance of fast fault clearing performance to aid in reliable production of power. Explanation is provided regarding small signal stability, high impedance transmission lines, line loading, and high gain, fast acting excitation systems. Transient stability is discussed, including synchronizing and damping torques. The power angle curve is used to illustrate how fault clearing time and high initial response excitation systems can affect transient stability. The term, "power system stability" has become increasingly popular in generation and transmission. The sudden requirement for power system stabilizers has created confusion about their applicability, purpose, and benefit to the system. This paper discusses the fundamentals of the power system stabilizer and its effectiveness. In today's paper industry, power system stabilizers are being applied on larger machines in the Northwest United States and Canada.

97 citations

Patent
12 Mar 1992
TL;DR: In this article, a method of operating a meter to perform the steps of generating a measure of real energy consumed, generating a measured reactive energy consumed and generating, from the real energy and reactive energy measures, a measured of apparent energy consumed is presented.
Abstract: A method of operating a meter to perform the steps of generating a measure of real energy consumed, generating a measure of reactive energy consumed, and generating, from the real energy and reactive energy measures, a measure of apparent energy consumed. In one embodiment, the real energy and reactive energy measures are provided as integer quantity inputs. Particularly, assume S=kVAh, P=kWh, Q=kVARh, and R=Residue. Respective registers store values of P, [2P+1], Q, [2Q+1], and the sum [P2 +Q2 ]. Initially, the P, Q, and [P2 +Q2 ] registers are set to zero, while the [2P+1] and [2Q+1] registers are initialized to 1. At the arrival of a P pulse, the value in the [2P +1] register is added to the [P2 +Q2 ] register, then the P register is incremented by 1 and the [2P+1] register is incremented by 2. Exactly the same steps are carried out subsequent to receipt of a Q pulse. A set of registers also is used to store the S and [2S+1] data, and generation of the S pulses is determined as follows. After arrival of either a P or Q pulse, a trial subtraction of [2S+1] is made from the [P2 +Q2 ] register. If the subtraction does not cause an underflow, an S pulse is generated, the S register is incremented by 1, and the [2S+1] register is incremented by 2. If the subtraction causes an underflow, the [P2 +Q2 ] register is reset to its previous value, the other registers are not incremented, and no S pulse is generated.

74 citations

Journal ArticleDOI
TL;DR: In this paper, the dynamic interactions between mechanical and reactive modes of machines in a multi-machine power system are investigated in terms of machine angles, transient voltages, and coefficients which are functions of system parameters and operation conditions.
Abstract: In this paper the dynamic interactions between mechanical and reactive modes of machines in a multi-machine power system are investigated. The dynamic interactions are expressed in terms of machine angles, transient voltages, and coefficients which are functions of system parameters and operation conditions. The effect of the dynamic interaction can be examined by the electric torque loci on the A6-Aw phase plane. It is found that the interaction between the mechanical modes of machines has significant effect on stability characterized by the natural mechanical oscillation frequency and damping of individual machines.

72 citations

Journal ArticleDOI
01 Jul 1974
TL;DR: Models of synchronous machines which have been developed and used to analyze problems in the electric utility industry are described in this paper, where the development of alternative models, the transitions among the models, and the relations between problem and model are demonstrated.
Abstract: Models of synchronous machines which have been developed and used to analyze problems in the electric utility industry are described. The development of alternative models, the transitions among the models, and the relations between problem and model are demonstrated. Lower order models using standardized data are used in multigenerator stability studies. Machine and system tests and the computer results of simulating these tests are reviewed. The areas of agreement and differences between simulation and test for alternate models point to ways in which improvements may be made in the economy and accuracy of computer simulations. This leads to suggestions for future work and a discussion of an IEEE Working Group in this field.

54 citations