控制工程6（英文）The Design of Feedback Control Systems.pptVIP

Ch10 The Design of Feedback Control Systems 10.1 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. A compensator is an additional component or circuit that is inserted into a control system to compensate for a deficient performance. Types of compensation 10.2 Approach to system design Approach to system design 10.3 Cascade compensation networks Passive networks Operational amplifier circuits Transfer function of compensator The TF of phase-lead compensation 10.4 Phase-lead design using Bode diagram Design principle Design procedure Design example A lead compensator for a type-2 system A lead compensator for a second-order system 10.5 Phase-lag design using Bode diagram Design procedure Assignment E10.1 E10.2 E10.7 E10.14 * * Basic concept Approach to system design Cascade compensation networks Phase-lead design using Bode diagram Phase-lag design using Bode diagram Cascade compensation Feedback compensation Output, or load compensation Input compensation Composite compensation Feedforward +feedback Root locus method Frequency response method (Bode diagram) Phase-lead network Phase-lag network Phase-lag-lead network The compensator can be chosen to alter the shape of the root locus or the frequency response of the control system. In general, the compensation network can be chosen to have a TF: The TF of phase-lag compensation If the phase margin is not sufficient, phase lead can be added to the phase-angle curve of the system by placing the in a suitable location. To obtain maximum additional phase lead, we desire to place the network so that the frequency is located at the frequency where the magnitude of compensated curve crosses the 0-dB axis. 1 Evaluate the uncompensated sy