控制工程基础 南理工 AC2012_13.ppt

Ch9 The Design of Feedback Control Systems Main content Basic concept and approach to system design Cascade compensation network Phase-lead design using Bode plot Phase-lag design using Bode plot Feedback compensation Composite compensation Summary Review what we have learned Basic concepts and tasks (Chapter 1) Mathematical models (Chapter 2) Review what we have learned System characteristics and Performance (Chapter 3 and 4) System stability (Chapter 5 and chapter 8) Review what we have learned Root locus method (Chapter 6) Frequency response methods (Chapter 7) What should we do next? Introduction The design of a control system is concerned with the arrangement or the plan, of the system structure and the selection of suitable components and parameters. The alteration or adjustment of a control system in order to provide a suitable performance is called compensation. Types of compensation Types of compensation 9.1 Basic concept and approach to system design A compensator (controller) is an additional component or circuit that is inserted into a control system to compensate for a deficient performance. Approach to system design 9.2 Cascade compensation networks Passive networks Operational amplifier circuits Transfer function of compensator 1 Phase-lead network The TF of phase-lead compensation in above Figure is : Pole and zero plot Bode diagram Maximum phase-lead angle 2 Phase-lag network 3 Phase-lag-lead network Compensation networks First-order compensators Second-order compensator Operational amplifier circuits 9.3 Phase-lead design using Bode diagram Design principle Design procedure Design examples 1 A lead compensator for a type-2 system 2 A lead compensator for a 2nd-order system 9.4 Phase-lag design using Bode diagram Design principle Design procedure Design examples Example 1 Assignment E10.1 E10.7 E10.14 The TF of phase-lag compensation in above Figure is : （2）无源滞后网络 令 则 -90° [-20] Bode diagram 无源滞