Stability analysis of PWM feedback control systems with PID regulators
作者:
M.LA CAVA,
G. PALETTA,
C. PICARDI,
期刊:
International Journal of Control
(Taylor Available online 1984)
卷期:
Volume 39,
issue 5
页码: 987-1005
ISSN:0020-7179
年代: 1984
DOI:10.1080/00207178408933226
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Stability analysis is of great significance in those feedback control systems in which the power amplifier is operated as a pulse-modulator device, since under these circumstances the whole control system is highly non-linear. Stability in PWM feedback control systems with a proportional type regulator has been amply described in the literature. Only recently, however, have such studies been extended to include systems with a proportional-plus-integral regulator. In this paper the problem is considered for the case involving a PWM control system, where the regulator is a proportional-plus-integral-plus-derivative, the PWM modulator is of a very general type and the controlled process is of arbitrary order. The stability of the system is analysed by means of a discrete version of the second Lyapunov method ; this method in turn leads to an investigation of the positivity region of a quadratic form defined in the parameter space of the regulator. To improve the stability region obtained, a procedure is investigated whereby only a few parameters of the quadratic Lyapunov function need to be varied. The method proposed has proved extremely simple and flexible to apply, even in cases where the system is of arbitrary order.
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