Title :
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
fDate :
11/1/1993 12:00:00 AM
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 Td0´, line reactance xe, AVR gain KA 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;
Journal_Title :
Generation, Transmission and Distribution, IEE Proceedings C
