Fuzzy Logic Controller for Three level- NPC Inverter to Modified DTC SVM of Induction Motor

Abstract

Soft switching devices gained importance recently in Industries to have wavering speed supervision ofasynchronous machine(IM). Various speed regulation techniques such as constant flux supervisonl, scalar control and vector restraint  have been proposed to regulate  speed of asynchronous machine(Induction Motor). Recent advancements showsdominance supervision of flux and torque-SVM of asynchronous machine became fancy due to its simple structure in implementation, though two-level inverter suffers from disadvantages of flux and torque error. To eliminate above problem 3-Level NPC inverter with modified DTC-SVM is being implemented. In the proposed method sector identification for the space vector is eliminated, and becomes simpler in implementation. Design of PI controller becomes difficult where parameter variations are observed. To avoid this problem Rules based controller is used(i.e) FLC. The above approach is simulated in MATLAB/SIMULINK and results obtain9ed are satisfactory.