Abstract
With the evolution of the More Electric Aircraft (MEA) concept, high pulse converters have gained the attention of researchers due to their higher power quality. Among the high pulse converters, 18-pulse autotransformer rectifier unit (ATRU) offers better power quality level with small size, weight and medium complexity. The conventional topologies of autotransformers that require the use of extra elements such as Inter Phase Transformers (IPT) or Zero Sequence Blocking Transformers (ZSBT), adding to the complexity, weight and size of the overall system, are not considered in the analysis. For 18-pulse rectification, only those topologies of autotransformers which have the intrinsic current harmonic cancellation capabilities are presented here for comparison. These topologies offer current harmonic levels within limits specified by IEEE 519 with reduced weight and size as compared to the conventional multi-pulse converters. A comparison of different differential delta/fork configured 18-pulse autotransformer rectifier units is presented so as to come up with the best among available topologies with respect to weight, size and power quality. Experimental prototypes of each topology were designed and their results are displayed along with the simulation results for comparison.
Highlights
Power electronic converters have gained the attention of engineers due to their excessive use in electronic systems such as low-power computer systems, industrial machines and household appliances [1]
The concept of utilizing electrical systems instead of pneumatic and hydraulic systems is known as the “More Electric Aircraft (MEA)”
Variable speed electrical drives with associated power electronic converters are likely to be used for driving the main pumps designated for fuel and lubrication in the MEA approach [5,6,7,8,9,10]
Summary
Power electronic converters have gained the attention of engineers due to their excessive use in electronic systems such as low-power computer systems, industrial machines and household appliances [1]. Apart from advantages offered by the MEA concept, there are several issues that needs to be addressed such as interaction between source and loads due to an increase in power electronic loads, instability, and the generation of low-order current harmonics on the AC supply side. Engineers have focused their attention on developing new control techniques and efficient power converters for obtaining high reliability and performance and to meet the IEEE-prescribed standards in power quality [11]. Mentioned are the different topologies of 18-pulse auto transformers
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