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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...
The paper deals with the design of an electric locomotive drive system used in electric railway transportation. The drive system consists of an induction motor and a voltage source inverter. A dedicated induction motor design algorithm is developed, in order to improve the motor efficiency. The design of the induction motor was realized with MathCAD and validated with Matlab Simulink. In the second...
The report is dedicated to the closed-loop design for a phase locking and a magnitude balancing of the three-phase inverter voltages to the three-phase grid voltages when the AC motor stator windings are switched to the AC power supply from the power frequency converter and backwards. The proposed control strategy for the AC drive with IGBT-inverter allows to decrease an inductance of current-balancing...
Model predictive torque control (MPTC) is a kind of powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response. However, MPTC suffers from tedious and time-consuming tuning work for the weighting factors, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper proposes...
In this paper, we present a double direct control of the torque of the doubly fed induction motor (DFIM). First, the modeling of the motor is carried out in order to apply the technique of dual direct control of the torque (DTC). Thereafter, an explanation of the said control is spread out as well as the principle of adjusting the flux and the electromagnetic torque according to the desired speed...
This paper deals with the sensorless self-commissioning of synchronous reluctance motors at standstill. Previous work demonstrated that the injection of high test voltage pulses can be successfully used to determine the flux linkage maps of the Synchronous Reluctance machine without position transducer and with no need of rotor locking. In this work, the tuning aspects of the above self-commissioning...
Advances in power electronics devices and materials are creating opportunities to improve both machine and drive design in order to obtain better overall system performance by designing each to exploit the advantages available from technology development in the other. In order to combine wide-band-gap devices with novel machine designs that can benefit from their application, guidance about the interactions...
A direct torque control strategy based on zero voltage vector distribution is proposed for neutral point clamped (NPC) three-level inverter-fed permanent magnet synchronous motor (PMSM) drive system, which is characterized by low torque ripples and fast speed response. In this proposed control scheme, 12 synthesizing voltage vectors with zero voltage vector are selected according to the error switching...
The presented paper deals with the calculation of the electromagnetic torque ripple waveform of an induction machine (IM) in steady state. The motor is supplied by non-harmonic voltages from semiconductor inverter. Mathematical model of the inverter is built on the base of complex Fourier series. Based on the mathematical formulas across the terminal inverter voltages a voltage spatial phasor is derived...
The paper deals with topologies of two, three and four leg converters for two-phase AC motors and the analysis of space vector pulse width modulation. Space Vector Modulated Direct Torque Control (SVM-DTC) for the two-phase induction motor is also used. Proposed control technique and estimators are simulated with Matlab/Simulink. Experimental verification is done with dSPACE environment.
This work represent induction motor modeling from its dynamic equations. The switching table base DTC(ST- DTC) is implemented to the dynamic machine model for 2 level and 3-level voltage source inverter. Out of 27 switching vectors of 3-level inverter, 12 active vectors are used for simulation of DTC with 12 sectors. For reduction of torque ripple a five level torque comparator is proposed. A comparison...
The analysis of two, three and five-level diode-clamped inverter fed Interior Permanent Magnet Synchronous Motor drive for Electric Traction application is presented. The drive has been controlled by Direct Torque Controlled Carrier Based Space Vector Pulse width Modulation (DTC-CBSVPWM). DTC is a precise controller for permanent magnet synchronous motor (PMSM) owing to its robust and fast torque...
This paper discusses application of Multilevel Inverter (MLI) in closed loop control of induction motor. This topology of MLI is called Nested topology which helps in reducing harmonics thereby increasing & improving the level and quality of voltages respectively. Proposed topology increases efficiency of output by reducing the losses effectively. The work mainly focuses on Matlab simulation and...
Recent evolution in power electronics and semiconductor switching devices has paved the way for amelioration of various power electronic systems. Hence, various multilevel inverter configurations have been put forward with reduced device count and increased output levels. Pulses with modulated (PWM) adjustable speed drives are employed in various industrial drive applications to achieve superior performance...
This paper presented the design and implementation of an induction motor drive. In order to improve energy efficiency of this drive, system configuration comprised a single to three-phase converter with additional circuitry for PFC. In this design, using TI's UC3854 as the PFC controller chip, and the related parameters were designed. The control scheme was based on V/f control using two low-cost...
A deadbeat predictive current control (DPCC) algorithm for PMSM drive system basing on disturbance compensation is proposed in this paper. First, a stator current and disturbance observer (SCDO) is presented to simultaneously predict future value of stator current and track system disturbance caused by parameter mismatch in real time. Based on this SCDO, a composite control method combining the DPCC...
This paper presents an investigation of an inverter fault tolerant direct torque control (DTC) of permanent magnet synchronous motor (PMSM) with loss of one leg. In case of faulty inverter, continuous operation is necessary and thus a breakdown of the PMSM drive is unacceptable. The basic idea of this work consists in analyzing performance of a three legs inverter and two legs inverter fed PMSM drive...
In variable speed applications based on induction motor (IM) drives, two types of popular control strategies are distinguished: rotor flux oriented control (RFOC) and direct torque control (DTC). This paper investigates an experimental evaluation of four control strategies for two-level three-phase inverter fed IM drives, namely: (i) RFOC with current-controlled PWM, (ii) RFOC with voltage-controlled...
Pulsewidth modulation (PWM) variable speed drives are increasingly applied in many industrial applications that require superior performance. The carrier-based PWM strategy can be improved by adding different zero sequence signals to the reference sinusoidal phase voltages. This paper presents a comparative evaluation of five carrier-based PWM techniques with zero-sequence signal injection for a six-switch...
A novel dead time compensation scheme for Pulse Width Modulated (PWM) Voltage Source Inverter (VSI) drives is presented. Dead-time is essential to prevent short circuit of DC link in PWM inverters. This causes dead-time effect which results in output waveform distortions and undesired characteristics. This paper deals with a new dead-time compensation scheme where a different approach is used in inserting...
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