Comparison of Schemes for Windup Protection

Abstract: The purpose of this study is to compare different schemes of anti-windup. The methods are compared for different processes and different disturbances; step response in setpoint, and load and measurement noise. The controller parameters are determined by the MIGO method and the reset time constant. The tests have been done by simulation in Matlab Simulink and the report is divided for PI and PID control and structured by the tested processes. The methods are compared to find pros and cons for the specific processes. The thesis has shown that no method is uniformly best. All methods are reasonably good but they have advantages and disadvantages. The disturbance type and the process dynamics determines which method is most suitable in a specific case.