Analysis of nonlinear integral controller for control of systems with AC motors

The results of nonlinear integral controller analysis for control of systems with AC motors have been presented. The control idea is based on an integral control method when integral constant K/sub 1/ is some function of error e. The range of possible values of error has been split up in to the zones and values of e and K/sub 1/ have been considered constants inside every zone. The liquefied gas supply control system with AC motor drive using two types of nonlinear integral controller has been investigated. The investigation was performed using dynamic system simulation program SIMULINK. The main advantages of the investigated types of nonlinear integral controller are their noise resistivity and low cost realization.