Discrete mode power system stabilisers

Author

Kothari, M.L. ; Nanda, J. ; Bhattacharya, K.

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi, India

Volume

140

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

523

Lastpage

531

Abstract

The paper presents a comprehensive approach for the design of discrete mode conventional power system stabilisers (PSS) considering a machine infinite bus system, using the ISE technique. Investigations reveal that the sampler and zero order hold (ZOH) need to be modelled for sampling frequencies less than 20 times the Nyquist frequency and that, beyond 20 times the Nyquist frequency, the sampler and ZOH may be neglected from the mathematical model. A comprehensive sensitivity analysis reveals that the discrete mode conventional PSS is quite robust and its nominal optimum parameters need not be reset following ±20% changes in inertia constant H, field open circuit time constant T_d0´, line reactance x_e, AVR gain K_A or loading P and Q from their nominal values

Keywords

Nyquist criterion; control system analysis; control system synthesis; discrete systems; power system control; power system stability; sensitivity analysis; transfer functions; ISE technique; Nyquist frequency; PSS; control system synthesis; design; discrete mode power system stabilisers; machine infinite bus system; mathematical model; robust; sampling frequencies; sensitivity analysis; transfer functions; zero order hold;

fLanguage

English

Journal_Title

Generation, Transmission and Distribution, IEE Proceedings C

Publisher

iet

ISSN

0143-7046

Type

jour

Filename

285162