Title :
Sampling time selection and its effect on direct digital and adaptive control algorithm implementation
Author :
Boucher, A.R. ; Cox, C.S. ; Doonan, A.
Author_Institution :
Control Syst. Centre, Sunderland Polytech., UK
Abstract :
The influence of sampling time on the performance of several digital control algorithms is examined through the use of simulations. Good control can be achieved at coarse sampling rates by using a `true digital´ design, and proportional-integral-plus is found to be a particularly simple, general purpose, digital control algorithm that works well with coarse sampling. Finally, the load disturbance rejection properties of coarse sampling controllers are investigated, and it is suggested that there is a `worst case´ during the sampling cycle time at which load disturbances can occur. It is therefore recommended that the controller should be designed for this condition, thereby ensuring acceptable performance for all other cases
Keywords :
adaptive control; direct digital control; sampled data systems; stability; two-term control; PI-plus control; PIP control; adaptive control algorithm implementation; coarse sampling rates; direct digital control; load disturbance rejection properties; proportional-integral-plus control; sampling time selection;
Conference_Titel :
Implementation Problems in Digital Control, IEE Colloquium on
Conference_Location :
London