Zigzag Connected Autotransformer-Based 24-pulse AC-DC Converter

Abstract

In this paper, a zigzag connected autotransformer-based 24-pulse AC-DC converter is designed, modeled and simulated to feed direct torque controlled induction motor drives. Winding arrangements and parameters of the autotransformer and interphase reactor are given. Moreover, the design procedure of the autotransformer is modified to make it suitable for retrofit applications.Simulation results indicate that the system is capable of eliminating up to 21st harmonics in the ac mains current. The effect of load variation and load character is also studied to demonstrate the performance and effectiveness of the proposed 24-pulse converters. A set of power quality indices at ac mains and dc side are presented to compare the performance of 6-, 12-and 24-pulse converters.

Novel Step-Up Topologies of Zigzag Autotransformer

“…According to the practical needs, domestic and foreign scholars have studied and expanded a variety of phase-shifting transformer topologies, which has laid a theoretical and practical foundation for the further development of multi-pulse rectifier technology [18,19]. However, the optimization and reconstruction of the autotransformer are mostly to generate more pulses at the output side of the autotransformer and reduce the harmonic content at the grid side, while there are few studies on the step-up of the autotransformer [20,21].…”

Novel step-down topologies of star-connected autotransformer

“…In recent years, because of the large use of power semiconductor devices in the power system, a large number of harmonics have been produced in the rectification part of power equipment (Meng et al , 2015; Chen and Hao, 2015; Singh et al , 2008; Badrzadeh and Gupta, 2013; Kumar and Zare, 2016; Hu et al , 2015). Generally, there are two main methods to reduce the content of harmonics in the power system.…”