Rule-based Fuzzy and V/f Control for Induction Motor Speed Responses Using SVPWM Switching Technique

Abstract

This paper describes the development of a three-phase induction motor (TIM) drive speed controller. A rule-based fuzzy logic controller (FLC) is developed for TIM speed control in non-linear systems. Speed control applications are tested by conducting simulations under different operating conditions. To achieve reliable TIM operation, the space vector pulse width modulation (SVPWM) scheme is used to generate gate signals for the three-phase, two-level inverter. The SVPWM technique demonstrates excellent performance in TIM speed control. The scalar control (V/f control), which is inexpensive, simple to implement in hardware, and applicable to medium-and high-speed rated TIM applications, is used to control the developed TIM. Results show that the implementation of rule-based fuzzy with V/f control and the SVPWM technique for TIM speed control provides superior performance, which is sufficiently robust and intelligent for real-time applications. Streszczenie. Opisano nową metodę sterowania prędkością trójfazowego silnika indukcyjnego. Wykorzystano sterownik bazujący na logice rozmytej umożliwiający sterowanie w systemach nieliniowych. Do bramkowania sygnału dwupoziomowego przekształtnika wykorzystano wektorowa modulację szerokości impulsu SVPWM. Zastosowano też skalarny przetwornik V/f. Fuzzy logic sterownik wykorzystujący modulację SVPWM do kontroli szybkości silnika indukcyjnego

Comparative Analysis on Speed Control of a Three Phase Induction Motor Drive Using Proportional Integral Differential and Scalar Closed Loop Fuzzy Logic Approach

“…With regards to the FLC, these rules portray a nonchalant relationship between the two inputs which are speed error and its derivative and an output which is the change in control. [7] presented a rule-based FLC this was developed for speed control of a three-phase drive in a non-linear system. Speed control application was tested by conducting simulations under different operating conditions employing a constant v/f control scheme and SVPWM technique.…”

Fuzzy logic speed controller optimization approach for induction motor drive using backtracking search algorithm

“…The d-q axis stator voltage and rotor voltage state equations of TIM in the stationary frame are shown in the equations below [1,8,24].…”

“…The principle of V/f control is to keep the scalar voltage/frequency ratio (V/f) constant, and thus the magnetic flux in the maximum air gap is maintained. No explicit relationship exists between voltage and frequency; however, the flow of electromagnetic flux produces a relationship between voltage and frequency as follows [5,24]: (8) where ϕ m is the maximum air-gap flux, is the maximum phase voltage, is the frequency, and is the ratio of to . In Fig.…”

“…The SVM technique only computes the time shares of the space vectors and does not specify the location in which these space vectors are applied [24]. …”

“…The hexagon consists of the six non-zero vectors (i.e.,) and two zero vectors (i.e., . The PWM control has important factor known as the modulation index as shown below[24,27]:(10) where is the maximum value of the fundamental voltage and is the maximum value of the fundamental voltage at a six-step operation. Accordingly, where is the DC-link voltage.…”