What Are the Effects of the PID Lead-Lag VI on a Closed-Loop Control System?
Primary Software: LabVIEW Toolkits>>PID and Fuzzy Logic Toolkit
Primary Software Version: 8.2.1
Primary Software Fixed Version: N/A
Secondary Software: N/A
Problem: What are the effects of the PID Lead-Lag VI on a closed-loop control system?
Solution: The PID Lead-Lag VI is an approximation of a true exponential lead-lag function, and the output is calculated by
where Tlead is the lead time and Tlag is the lag time in minutes. A lead-lag compensator combines the effects of a lead compensator with those of a lag compensator. The result is a system with improved transient response, stability, and steady-state error. In general, the lead portion of the controller is used to achieve a shorter rise time and higher bandwidth, and the lag portion is brought in to improve the relative stability of the closed loop system.
For more information refer to page 3-13 in the PID Control Toolset User Manual linked below. You can also run the Simulation-Lead-Lag example VI located in
labview\examples\control\pid\prctrlex.llb.
Related Links: Product Manual: LabVIEW PID Control Toolset for Windows
Attachments:
Report Date: 02/20/2003
Last Updated: 07/01/2009
Document ID: 2UJGGGVS
