An advanced DTC-SVM scheme for speed control of V.S.I. fed induction motor using F-logic controller

For excellent performance of torque control In AC drive system, the direct torque control approach is applied. There are two hysteresis comparators are found in a standard DTC drive. Variable switching frequency and ripple of high torque plague DTC drives that use hysteresis comparators. The space vector, which is dependent upon some other value of torque and flux, is some kind of typical solution to these difficulties. The DTC-SVM techniques have a fixed frequency of switching. The space vector modulation methods are widely used in the control system. The switching signals which are used in DTC SVM techniques is based on averaged data, whereas the inverter is calculated using a space vector modulation method. This is primary distinction of DTC and DTC-SVM control approaches. Now, an advanced DTC-SVM method will be built on a VSI-fed Induction Motor in this thesis. To compensate for flux and torque defects, space vector modulation is a method that calculates the needed voltage space vector. F-logic control is a linguistic-based control algorithm strategy without the use of a mathematical model, which seeks to account for human understanding of how to regulate a system. The speed error which is denoted by e and change of speed error are the input value for the F-Logic controller. The speed error is derived by comparing the reference and actual speeds. Other benefits of using F-logic in F-controllers include reduced phase current distortion, faster torque response, and increased drive efficiency.