Incorporation of Nonlinear Control and SOSM Controller with Improved PSO Algorithm for OEWIM Fed by SVM Seven-Level Dual Inverter

This paper proposes a combination of a nonlinear feedback linearization control (FLC) and a second-order sliding mode (SOSM) controller to enhance the effectiveness and performance of variable speed control in an open-ended winding induction motor (OEWIM). The literature indicates that the traditional FLC with a PI controller is susceptible to disruptions from its internals as well as outside interference. The conventional sliding-mode controller can offer robust control. However, it suffers from the chattering phenomenon. The SOSMC, based on a super-twisting algorithm (STA), was designed and implemented to overcome all of these drawbacks. It is extremely difficult to obtain the optimum parameters for each FLC and SOSM controller that give good results using traditional methods due to the relatively large number of parameters. Moreover, a novel approach based on the linearly decreasing method for both inertia weight and learning constant of the particle swarm optimization (PSO) algorithm was presented to improve the variable speed control of the OEWIM. To maintain a constant switching frequency, decrease harmonic distortion, and reduce common-mode voltage (CMV), a space vector modulation technique of a seven-level inverter is suggested and implemented by supplying each end of an open-ended stator winding induction motor with three-level inverters. The advantages of the suggested control system have been confirmed using simulated results of various tests of the complete system.