Abstract
This paper presents a detailed analysis of dynamic properties and accuracy issues of the torque-producing stator current control loop for vector-controlled induction motor drives. In this paper, a necessary mathematical description of vector control of an induction motor is shown with respect to the x-axis and y-axis current control in the rotating reference frame. A derivation of a steady-state error for the torque-producing stator current control scheme with and without a decoupling algorithm is described. The presented derivation and dynamic behavior of both these schemes were extensively tested in the MATLAB-SIMULINK software, considering different values for the moment of inertia. This solution was implemented in a DSC-based induction motor drive using a voltage source inverter to obtain experimental results. Moreover, the advantages of using the presented decoupling block for compensation of the problem are discussed at the end of the paper.
Highlights
Stator Current Error for Vector-Electrical drives, the main objective of which is a system utilization of electrical machines for electromechanical energy conversion and for control of this transformation, comprise a very important sector of electrical engineering.At present, variable speed electrical drives with induction motors belong to an industry standard
It is well known that a current control loop of DC or AC drives operates with a steady-state error during the rotor speed transient states, even when proportional integral (PI) current controllers are used [8]
The simulation results confirm the derived steadystate current control errors mentioned in Section 4 for the situation of the rotor speed transient-states
Summary
Electrical drives, the main objective of which is a system utilization of electrical machines for electromechanical energy conversion and for control of this transformation, comprise a very important sector of electrical engineering. Equations for the elimination of the coupling between the flux- and torque-producing stator current components are very often used for vector-controlled induction motor drives. Tating reference frame [x, y] oriented on the rotor flux space vector It is well known f the literature [16,17,18,19,20] that the decoupling equations are important for independent con of the stator current space vector components. A comparative study of two decoupling control methods, based on the of ferential geometry and the conventional vector control, is shown in [21] In this case decoupling between the flux linkage subsystem and the rotor speed subsystem is inv reference [x, y]drive oriented on the rotor. The vector control of an induction motor is based on the separation of the stator rent space vector into two perpendicular components, flux producing iSx and torque.
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