Denis A. Kotin

Speed control of sensorless induction motor drive based on model predictive control

In this paper, the model predictive control (MPC) technique for controlling the speed of sensorless induction motor drive is presented. To decrease the cost and increase the reliability and affectivity of the motor drive, a full order observer for speed estimation based on the model reference adaptive system MRAS is used to estimate the rotor speed. The adaptive full-order observer based on IM equation is used to estimate stator currents and rotor flux. Lyapunovs stability criterion is employed to estimate rotor speed based on the error between the actual and estimated currents. The same algorithm deduced from Lyapunovs stability criterion is given to estimate the stator resistance, which results in the speed estimation error. A simple model of induction motor is employed in the MPC structure so as to minimize the computational load. The MPC controller design is taken into account the effect of uncertainty due to motor parameters variation and load disturbance could be reduced. The effectiveness of the proposed scheme has been successfully verified through simulations. The results proved that the induction motor with the MPC speed controller has superior transient response, and good robustness in face of uncertainties including load disturbance. Moreover, accurate tracking performance has been achieved.

A comparative study of speed control based on MPC and PI-controller for Indirect Field oriented control of induction motor drive

In this paper, a comparative study of speed control based on Model Predictive Control (MPC) and PI for Indirect Field oriented control of induction motor drive has been established. This paper proposes two schemes for vector control of induction motor (IM) drive. The first drive system is based on PI controller for speed control of IM. The second drive system is aimed to apply the MPC for speed control of IM. The performances of the two drive systems are compared. The validity of the two proposed systems have been demonstrated through computer simulations. The results obtained have confirmed that the drive system based on MPC is effective and robust against load disturbance. In addition, it has fast and good transient response over a wide speed range..

State observer for sensorless vector control of doubly fed induction motor

New method of rotor speed and vector of stator flux linkages identification for doubly fed induction motor was proposed the present paper. This method is based on adaptive system that used full-order observer of electromagnetic processes in induction motor. Results of digital simulation for synthesized algorithm of sensorless vector control are presented.

Control algorithms and stability of direct current backup power supply for a frequency-controlled electric drive

Direct current backup power supply systems for a frequency-controlled circulating pump electric drive based on a storage battery or electromechanical generator are considered. The circuit, the main properties of a bidirectional galvanically isolated dc– converter, and the structure of its control system are shown. The operational stability of the backup power system in conditions of constant power consumption is analyzed. A stability margin correction algorithm with a glance of backup power supply system mains parameters is proposed. The experimental results are shown.

Controlled sensorless electric drive based on the thyristor slip recovery system for a wound-rotor motor

Questions of the development of a speed-controlled sensorless electric drive based on the thyristor slip recovery system for a wound-rotor motor in case of a higher rotor voltage in comparison with a matching transformer voltage are considered in this paper. The algorithm uses the data of measured currents and voltages of rotor and grid-tie inverter. Results of computational modeling of the suggested system and its implementation have been presented.

A doubly fed induction motor drive of a mine hoisting plant

This paper is devoted to the problem of designing a controlled electric drive of mine hoisting plants on the basis of a doubly fed induction motor. Problems for the developers of this system, particularly identification of immeasurable coordinates of an electric machine, are considered, and methods of solution thereof are proposed. A functional diagram of a frequency-controlled double fed electric drive built using a multilevel frequency converter on the basis of H-bridges is described. An algorithm of sensorless vector control for the case in which only rotor variables, i.e., currents and voltages, are measured is considered. A method of designing a hybrid control algorithm that combines a sensorless approach and vector control with the use of an increment encoder that allows the hoisting mechanism to function at both a zero and synchronous rate of the electric motor. Results of simulation of a multimotor system of an electric drive in the load balancing regime of electric machines are presented.

Active Stabilization of Axial Position of Rotor in Electric Machine

The article is devoted to the development of technical solutions centering the axis of rotation of the rotor of the electric motor during movement. Focuses on the problem of optimization of the axis of rotation of an electric machine rotor. The existing types of current unbalances of rotating part of electric machine and their causes are considered. It is specified that the methods used in practice balancing, do not meet the requirements of modern high-precision industries. A new solution to the problem of stabilization of the axial position of the rotating electric machine is suggested.

Cascade model predictive vector control of induction motor drive

In this paper, an approach using three model predictive controllers has been investigated for vector control induction motor drive. These controllers are connected in cascade in the feedforward, the first is used for speed control, the second is used for rotor flux control and the third is dedicated for current control. The validity of the proposed system has been demonstrated through computer simulations. A comparison between the proposed system and PI control has been offered. The results obtained have confirmed that the proposed system is effective and robust against load disturbance. In addition, it has fast and good dynamic response over a wide speed range.

Signal-adaptive controller for micro electric drive rotor radial displacement updating

The paper is devoted to the development and investigation of automatic correction system of rotor radial position updating of micro electric drive, used in high-precision processing systems. A new approach of solving the problem of stabilizing the rotating element of motor, based on active current updating of the spatial position is offered. The development of automatic control algorithm is done using the method of signal-adaptive inverse model. The paper describes the way of constructive implementation of this method, structural synthesis methodology of control law, as well as the results of simulation, confirming potential of conducted research.

General principles of medical exoskeleton design

General weaknesses of the existing medical exoskeletons were described in this article. Design issues of new modular medical exoskeleton with electromechanical drive were considered. Design results of active knee joint exoskeleton with field-oriented control were submitted.