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This paper presents an indirect rotor-field oriented control (IRFOC) algorithm for symmetrical six-phase double-winding induction machines with four three-phase sub-winding sets. The presented algorithm introduces the ability to control the power flow between different sub-winding sets. Multiple three-phase induction machines are utilised for critical applications such as more-electric aircrafts,...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
Indirect rotor field oriented control (IRFOC) plays an important role in the high performance induction machine drives. In the indirect rotor field oriented control — based induction machine adjustable speed control system, the rotor field angle is usually obtained by the rotor angular velocity and the slip angular velocity. The rotor angular velocity can be sensed by an encoder with sufficient accuracy...
Classical induction machine design generally focuses on achieving high steady state efficiency. In contrast, automotive applications consist of almost continuous transients, where the flux linkage is varied along the driving cycle to save energy. With conventional induction machines designed for high steady state efficiency, higher peak current and excessive machine losses can occur during the transient...
State estimation of induction machines may be a difficult problem, due to the non-linear behavior of theirs. For non-linear state estimation, the unscented Kalman filter (UKF) is a well-known extension of the linear Kalman filter. Operation of the UKF algorithm strongly depends on the process and measurement noise covariance parameters of the estimator. Determination of these parameters is not straightforward...
The paper is a result of the authors' researches in the field of energy area. The objective is to develop a power grid converter which includes all fundamental drive systems being capable to regenerate the energy into the grid. The topology fits very well to the hybrid renewable power systems, in order to control the green energy. Three-types of the electrical drives were included: the dc drive, the...
High performance drives with induction machines require use of vector control. The direct torque control and field oriented control are nowadays two most applied vector control methods. The main advantage of the method for direct torque control of induction machines is its simplicity and therefore its robustness. Namely, control variables (the electromagnetic torque and stator flux vector) are estimated...
This paper deals with the detection and localization of electrical drives faults, especially those containing induction machines. First, the context of the study is presented and an Extended Kalman Filter is described for induction machines fault detection. Then the modeling procedure under faulty conditions is shown, and the machine diagnosis methods are developed. The proposed diagnosis approach...
In this paper we analize the behaviour of model predictive control (MPC) on induction machine as an application for electric traction. We did a simulation on MATLAB/SIMULINK of a squirrel cage induction machine fed by a two level voltage inverter controlled by the MPC scheme with an electric vehicle as a load. We present the equations from the induction machine required by the control scheme, the...
The presence of both electronic-converter-based and rotating-machine-based energy sources in microgrids poses a challenge for its stable operation. Most of the stability studies in microgrids have been focused on the electronic converters interfacing a renewable energy source to an AC microgrid. However, the rotating machines are still a key component of many microgrids. This paper presents an induction...
Precise control methods of the electric drives with induction machines like field oriented control (FOC) or direct torque control (DTC) need an accurate model of the machine they control. Certain parameters of the model have to be obtained with sufficient accuracy before the drive can be put into the operation. This article concerns an offline parameter identification method that is suitable for on-site...
This paper presents a self-sensing control for an induction machine over a wide speed range, introducing a method which combines an EMF-based and a saliency-based approach. The major advantage of the proposed method is a simple-to-implement estimator for the entire speed range with low computational effort and an arbitrary high-frequency injection. Furthermore, a novel rotor design of an induction...
A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it. Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show...
This paper presents a set of system equations of a dual stator induction machine (DSIM) and a new approach for online parameter identification including its verification through simulation and measurements. An uneven current share between the two three-phase systems of a DSIM is used to determine machine parameters online.
The paper describes the voltage control technique of squire-cage induction machines supplied by a current source inverter. The control system is based on new transformation of the electric drive system (machine and inverter) state variables to the multi-scalar variables form. The backstepping approach is used to obtain the feedback control law. The control system contains the structure of the observer...
This paper analyzes the dynamic performance of FOC induction machines operating under current and voltage constraints. FOC rely on the proper performance of the inner current control loops. The capability of the machine to increase its torque can be seriously compromised due to the inverter voltage and current limits, which affect to the current regulator transient response. This can be especially...
The recent trend in squirrel cage induction motor manufacturing is to replace fabricated copper rotors with aluminum die-cast rotors to reduce manufacturing cost to stay competitive in the global market. Porosity in aluminum die-cast squirrel cage rotors is inevitably introduced during the die cast process. Porosity can cause degradation in motor performance and can lead to a forced outage causing...
A multiphase machine is more reliable than a three-phase one, but it usually shows reduced performance under faulty behaviour. In this paper, the performance in case of open-phase fault is analyzed, and two fault tolerant control algorithms, which aim to minimize the Joule losses in the remaining healthy phases, are compared. The proposed control techniques are validated by numerical simulations,...
Modified Magnetic-Equivalent-Circuit for a Double-Cage-Induction Machine is presented in this paper while rotor skewing, time and also space harmonics are considered. Pole numbers, rotor bars and slot numbers can be selected arbitrarily and saturable machine is simulated. To presenting of Modified magnetic equivalent circuit, a single set of the system equations including both magnetic and electric...
The utilization of asynchronous induction machines applied in railway traction drives is much higher than those used with industrial drives. Since this applies to both electromagnetic and thermal parameters, a multi-physics optimization with respect to electromagnetic and thermal behaviour will be introduced into the industrial design process. The discussed optimization approach consists of a sequential...
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