The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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...
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,...
Recently, multiphase induction machines are proposed to replace traditional three-phase drives in low-voltage large power applications with high fault-tolerance ability. This paper concentrates on their speed sensorless vector control algorithm of multiphase induction machine. A full-order adaptive observer is adopted to observe the rotor flux and rotor speed, and a harmonic suppression method combined...
Predictive current control is described for an Induction Machine in this paper. Instead of the cascaded PI control systems, the proposed system directly generates switching vectors by evaluating the designed cost function, which reduces the tuning parameters. An observer is applied for the sensorless system, whcih has the merit of low cost. The system is verified by experimental results.
This paper presents study of a Wind Energy Conversion System (WECS) based on asynchronous machine connected to a power grid through a back to back converter. The power output of a WECS fluctuates with the wind velocity, which makes it difficult to analyze and control. The control objectives of generator side converter (GSC) are to optimize the energy capture from the wind turbine. The grid connected...
A speed control scheme is proposed for a 3-phase induction motor that uses an open-ended stator winding fed by a dual inverter system with a floating bridge. The floating bridge has a voltage boosting function that extends the constant power high-speed range of the induction machine and operates the main inverter bridge at unity power factor. The proposed control scheme coordinates the two inverters...
In this paper, a modeling approach for a brushless doubly-fed induction machine is proposed using an equivalent system of cascaded doubly-fed induction machines. A Steady-state and a transient model are developed and the results show a good agreement to measurements conducted on a set of two 1.5 kW doubly-fed induction machines. One main aspect of this work is the examination of the electrical and...
Electric machine drive systems have a protection mechanism for momentary power interruption. Generally, when the momentary power interruption is occurred, outputs of a drive system are stopped for the protection. For stable continuous operation, it is sometimes required the restarting strategy which is called as a flying start when the input power is recovered and the rotor is still rotating freely...
A recently developed control method for multiphase induction machine drives termed the Brush-DC Equivalent control has presented a simpler control strategy that does not use any complex transformations. It has been implemented using a hysteresis current controller and in this paper, a delta modulated current control technique is presented. Delta modulation is proposed in to replace hysteresis control...
A different topology for brushless doubly-fed induction generators is presented. A power conditioning system is mounted onto two coaxially connected wound rotors. Carbon brushes and slip rings are replaced by the wound rotors and the rotor-mounted power condition system, which bi-directionally exchanges power to the grid with appropriate amplitude and phase difference between the voltages applied...
Grid integration of a laboratory scale Doubly Fed Induction Generator (DFIG) has been carried out and reported here. The stator of the DFIG is directly connected to the grid and the rotor is interfaced to the grid through a pair of back to back converters (rectifier and inverter). A low cost control scheme using sinusoidal pulse width modulation (SPWM) technique is used in the inverter to match the...
This paper proposes a drive system and a control method for a double inverter fed wound machine, where the stator and the rotor are fed by two variable frequency inverters. Compared with the conventional induction machine drive system, the proposed system can improve the operating area and the efficiency because the rotor side inverter allows an additional degree of freedom in control. Also, it has...
In a brush dc equivalent (BDCE) controlled machine, quasi-square like constant air gap flux density and rotor induced voltage waveforms are utilized. Analytical expressions for calculating the developed power, flux density, stator and rotor copper losses for the BDCE controlled cage rotor multiphase induction machine are developed in this paper. From analysing these expressions, it is found that,...
This paper presents a d-q model of dual stator induction machine supplied by a two identical PWM voltage source inverters suitable for analysis the dynamic steady under balanced operating condition. In the analytical model, the effects of common mutual leakage inductance between the two three-phase stator winding sets have been included. The model has been developed in general reference frame and...
An indirect rotor-field-oriented control of a dual stator induction motor drive is studied in this paper. For this purpose, a dual stator induction machine having two sets of stator three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points. The proposed approach is based on d-q model when the dual stator are fed by an independently current-controlled pulse width...
This paper represents an approach for modelling the double stator induction machine dynamic steady taking into account an arbitrary displacement between the two three-phase windings sets. This analysis is treated with a simple d-q analytical model of a DSIM in which the effect of the mutual leakage inductance between the two three-phase winding sets has been included. Quantitative analysis for the...
Contemporary field oriented controlled induction machine drives constitute a good compromise between high power density and economical employment of exhaustible raw materials. Since for such drives the excitation is created by the magnetizing current which is part of the stator current along with the torque generating fraction, there are two degrees of freedom in the stator current generation to achieve...
The circuit parameters involving the stray load loss and harmonic torques of high speed induction motors driven by inverters are determined by both finite element analysis and experiments. In the analysis, the parameters are directly determined from the electromagnetic field distribution of the motors under load conditions. On the other hand, in the experiment, the parameters are determined from no-load,...
This paper discusses stability conditions of direct torque control (DTC) based on a singular perturbation perspective. Input-output decoupling is discussed and asymptotic-input-output-decoupling is proposed in order to improve erratic DTC performance reported by practitioners. Stability analysis shows that DTC is applicable for low-leakage machines. A detailed mathematical stability analysis and an...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.