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Multilevel inverters are increasingly being used due to their superior performance compared to two-level inverters. Different circuit topologies on multilevel inverters have been extensively researched. Conduction and switching losses of IGBT in multilevel inverter is the key factor which could influence the converter reliability and efficiency. In this paper, thermal evaluation is described for four...
Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control. The conventional DTC drive contains a pair of hysteresis comparators, a flux and torque estimator and a voltage vector selection table. The torque and flux are controlled simultaneously by applying suitable voltage vectors, and by limiting these quantities within their hysteresis bands,...
A new seven-level inverter topology for IM drive is proposed in this paper. This topology consists of two three-phase two-level inverters fed by isolated DC voltage sources and six H-bridges fed by capacitors. An important advantage of this topology is the reduction in DC link voltage magnitude by half when compared with the requirement of DC link voltage in conventional NPC or flying capacitor topologies...
A common mode (CM) EMI active filter for automotive induction motor drives is proposed. The active filter is useful in compensating the CM voltage at the motor input, allowing an increase of the drive reliability and a reduction of the leakage high frequency CM currents which affect the vehicle Electromagnetic Compatibility (EMC). The active filter is based on a feedback-action and it is realized...
This paper analyses the mathematic model of multiphase induction motor, and the magnetic motive force generated by the harmonic currents. Compared to three phase drives, the multiphase motor drives have the advantage of performances on dead-time effect, common mode voltage, technology of non-sinusoidal source fed and reliability. A universal multi-phase voltage source inverter (VSI) is constructed...
This paper presents a comparison study between the operation of a back-to-back and a matrix converter induction motor drive under the presence of faults in the power switches of these converters. These two topologies are functionally equivalent in terms of input power quality and energy regeneration capabilities but need to be compared in terms of performance under faulty conditions as well due to...
In a motor-drive system, there are many factors which can be considered as a figure of merit in drive control algorithm. All of these factors should be evaluated simultaneously to achieve the reliable performance of drive. In this paper, an optimization problem is constructed on a direct torque controlled induction motor drive using a candidate from different parts of drive system: inverter loss from...
Common mode currents must be limited in order to increase reliability and electromagnetic compatibility of electric drives. In the present paper, the choice of the switching patterns is performed according to the sign of the load currents. A simple strategy is proposed in which, by using only-odd or only-even switching states, it is possible to reduce the common mode voltage variations to a single...
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