Abstract Purpose – For DTCIMDs one effective solution to eliminate harmonics is the use of multipulse AC-DC converters. Many researchers have used different configurations based on 24 and 30-pulse rectifications for improved power quality. However, the THD of ac mains current with these topology is more than 4% when operating at light load. For mitigating the total harmonic distortion (THD) problems observed in the input currents, abdollahi propose 40, 72 and 88-pulse AC-DC converters while the power quality enhancement was the main concern. It is known that increasing the number of pulses further results in reduction in current harmonics, but this is accompanied by an increase in cost as well as complexity. To Harmonic Reduction without increasing the cost and complexity, in this paper, a 36-pulse ac-dc converter is proposed employing a novel delta/hexagon transformer. Design/methodology/approach –The proposed converter consists of two paralleled 18-pulse AC-DC converters involving nine phase shifted uncontrolled diode bridges with interphase transformer circuit. Findings – In this paper, the proposed scheme is simulated by MATLAB/SIMULINK considering different loading scenarios. The simulation results show that the proposed scheme improves the power quality indices and satisfies the IEEE-519 requirements at the point of common coupling (PCC). Also, a laboratory prototype is implemented using the proposed design and the experimental results confirm the simulation results under different loading conditions. Originality/value – The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard.
کلید واژگان :Keywords AC–DC converter, power quality, 36-pulse rectifier, direct torque controlled induction motor drive (DTCIMD).
ارزش ریالی : 600000 ریال
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