Accuracy Analysis of Digital Control Systems With Two-Time-Scale Motions

The problems of the robust digital controller design and control accuracy analysis are discussed. The design method based on the formation of two-time scale motions in the closed loop system is used. If a sufficient time-scale separation between the fast and slow modes in the discussed closed loop system and stability of fast modes are provided then slow modes have the desired form. Thus the output transient performance indices are insensitive to external disturbances. The relationships for control accuracy analysis and choice of the sampling period are obtained. Finally, an example with simulation results is presented.