With the advent of IMD, almost most of the day to day application becomes very cost effective and convenient to operate at better performance. Automotive industry, fan, water pump, industrial grade motor drives, servo drives, compressor etc are having state of art in this technology and experiencing the convenient of advanced technology. With the rapid developments of the same as it is finding applications in small size device to electric vehicles and even in most advanced strategic importance equipments, the future of this drive is more prominent and it is of further performance, cost as well as compactness be improved and packed in single module to meet the customer requirement with wireless technology. In near future, the wideband gap semi conductor by using silicon carbide or gallium nitride. This technology is in nourishing stage, and after the development of the same, it may give equal significance to the conventional IMDs. This is due to the better operating characteristics in temperature, efficiency, and switching frequencies. Due to the wide band gap, the leakage current may be low and it results in increased temperature limit. The on-state resistance of the SiC or GaN is 3000 times comparatively less than the silicon devices, gives better thermal conductivity. Also, at the reduction of its mass and volume, the wideband gap devices provide higher switching frequencies at faster rate will tend to shift the application arears to its favour’s2
Piotr Sobanski et.al 3 elaborates the operation of induction motor drive, the open circuit fault diagnosis is being considered for the analysis purpose. This fault detection cinches the power failures in very minimal time span. In this paper, the author discusses power converter faults related to power devices and its circuit damages, since this account majority of the fault types almost about 60%. So, to diagnosis this frequent occurring fault, the voltage source inverter needs to be tested and bring it to foreseen picture. To do the fault diagnosis model, the author concentrated on voltage space vectors topology is being implemented. By based on the rotation of space vector against the motor direction, the space vectors are keeps on changed by its numbers as shown in Fig. 12. So, by going for direct torque control schemes with SV PWM technique, the fault diagnosis transistor also gets reduced and to narrow down the faulted transistor rule base is being implemented.
In this paper 4, author described the general methodology for failure analysis and evaluation of the inverters configuration, their switching losses, rate of failure, temperature and their conduction losses and determined reliable control strategies. A three-phase three-level NPC inverter have been built for verifying the theoretical analysis and the experimental setup has been made and compared with simulation and results and author found out both simulation and experimental results are same. The author analysed the thermal image of the NPC topology converter configuration during their evaluation strategies. This article gives the comprehensive reliability analysis between the SPWM, THIPWM and SVPWM. NPC converter control strategy and their life time and based on the results obtained SVPWM becomes most feasible control strategy for Inverter drives configurations. This articles also confirms the power switches most assailable components and leads to loss distribution. Author5 cites the commutation failure in inverter drives and the mitigating the same using thyristor based full bridge module (TFBM). The proposed topology by the author presents evolutional line commutated converter operates with thyristor in each arm in full bridge scheme and using TFBM the mitigating efforts is being performed in stage wise manner. Commutation support performance has been enhanced using this topology and to evaluate the susceptibility of CFs the immunity index is adopted which is given by CFII = V2/ (?*L min*Pdc) * 100.
Md. Habibullah et.al 6, discusses the torque control of inverter drive suffering from high and variable switching frequencies in a wide range of inverter applications. To make stator currents with low harmonics, low torque ripple, the authors integrates the finite state predictive schemes of torque control in this article. Using this topology, the torque and flux ripples are reasonably good from the experimental results. Since the dead time incorporated in the inverter circuits, the higher order harmonics are relatively low compared to other methodology. Hadeed A. Sher et.al 8 discussed the experimental study of DC link capacitor failure in induction motor drive. Open circuit of the same has been discussed and analysis possible causes and effects for the said fault. From the analysis, it has been found out that, higher ripple frequencies will enable us to give better ride trough capabilities to this particular fault. The three phase induction machine model is created for the simulation and compared with single phase system, based on the simulation output the experimental setup was performed to validate the results obtained in simulation. The simulation block is presented in Fig. 13 which is used for ride through capabilities of DC link capacitor fault failure.