Coherency and model reduction: state space point of view

Author

Troullinos, George ; Dorsey, John

Author_Institution

Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

4

Issue

3

fYear

1989

fDate

8/1/1989 12:00:00 AM

Firstpage

988

Lastpage

995

Abstract

Analytical connections are determined that relate coherent stability behavior of generators to redundancy in the controllability and observability gramians of the linear model of the power system. This redundancy is removed from the gramians of the reduced-order model generated by aggregating the coherent machines. Model reduction in large power systems is shown to be better if the order estimation information in the controllability and observability gramians is weighted properly by balancing the system. Perfect coherency of generators is related to the parameters of the linear model of the power system. Waveforms for generating the RMS coherency measures are compared. An algorithm for order reduction based on balancing is outlined and justified by testing on a 240-generator, 2500-bus system

Keywords

power systems; stability; algorithm; coherency; generators; model reduction; power system; redundancy; stability; Controllability; Observability; Power generation; Power system analysis computing; Power system measurements; Power system modeling; Power system stability; Reduced order systems; Stability analysis; State-space methods;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.32589

Filename

32589