New Adaptive High Starting Torque Scalar Control Scheme for Induction Motors Based on Passivity

Juan Carlos Travieso-Torres,Ángel Costa-Montiel,Manuel A Duarte-Mermoud,Alejandro Álvarez-Gracia,Camilo Contreras-Jara,Miriam Vilaragut-Llanes,Norelys Aguila-Camacho

doi:10.3390/en13051276

Abstract

A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM) is proposed in this paper. It uses a new adaptive-passivity-based controller (APBC) proposed herein for a class of nonlinear systems, with linear explicit parametric dependence and linear stable internal dynamics, which encompasses the IM dynamical model. The main advantage of the HST-SCS includes the ability to move loads with starting-torque over the nominal torque with a simple and cost-effective implementation without needing a rotor speed sensor, variable observers, or parameter estimators. The proposed APBC is based on a direct control scheme using a normalized fixed gain (FG) to fine-tune the adaptive controller parameters. The basic SCS for induction motors (IM) and the HST-SCS were applied to an IM of 200 HP and tested using a real-time simulator controller OPAL-RT showing the achievement of the proposal goal.

Highlights

Compared to direct current electric motors, induction motors (IMs) have a lower cost and higher efficiency, require lower maintenance, and have been replacing them in variable speed operations with increasing use in the past twenty years [1]
Considering Equation (5), we explore how to keep a constant im by keeping a constant stator phase current is to guarantee an high starting torque (HST)
In order to verify the achievement of the proposal goal, comparative experimental results considering real-time simulations are described

Summary

Introduction

Compared to direct current electric motors, induction motors (IMs) have a lower cost and higher efficiency, require lower maintenance, and have been replacing them in variable speed operations with increasing use in the past twenty years [1]. The IM is fed by different types of alternating current (AC) drives [2], which differ in their performance with respect to the starting torque, transient speed behavior, and steady-state speed-accuracy of the desired speed [1]. Medium, and high-performance applications, three main control schemes are used: scalar control scheme (SCS) [3], direct torque control (DTC) [4], and field-oriented control (FOC) [5,6] respectively. There is a simpler AC/AC soft starter based on thyristors [3], but it does not allow variable speed operation. It only reduces the starting stator current while moving low starting torque loads. This reduction is made by reducing the starting voltage applied to the motor

Objectives

Results

Conclusion