D-type asymmetrical 24-pulse autotransformer rectifier

Abstract

The invention discloses a D-type asymmetrical 24-pulse autotransformer rectifier, which includes a D-type asymmetrical 24-pulse autotransformer and four rectifier bridges, and the positive and negative outputs of the four rectifier bridges are respectively connected in parallel as positive and negative output terminals. . This autotransformer has one primary winding per phase, three center taps, and three independent windings per phase secondary. By changing the winding position of the secondary winding of the autotransformer, the terminal with the same name, and the middle tap position of the primary winding, 8 different transformer modes are formed; each mode of transformer outputs 4 groups of three-phase symmetrical voltages with different amplitudes, Send to 4 rectifier bridges, that is, 1 main rectifier bridge and 3 auxiliary rectifier bridges. Each phase of the main rectifier bridge and the three auxiliary rectifier bridges constitutes 24 voltage vectors with equal amplitudes with phase differences of 15° in sequence, and only 2 diodes are turned on at the same time every 15° to form a 24-pulse DC output voltage. The invention has only 4 windings per phase, does not need an output balance reactor, and has a simple structure.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion, and in particular relates to a D-type asymmetrical 24-pulse autotransformer rectifier. Background technique [0002] The widespread use of multi-electric technology in the field of civil aircraft puts forward more stringent requirements for aircraft power supplies. For airborne electronic equipment, the national military standard GJB181A-2003 and the civil aviation aircraft airworthiness standard RTCA_DO-160E require the total harmonics of the input current on the AC side Content (THD) is less than 10%. The input current THD of the 12-pulse rectifier is as high as 15.2%, and the input current THD of the 18-pulse rectifier is still 10.11%. Certain filtering techniques are required to reduce the harmonic content of the input current, while the theoretical value of the input current THD of the 24-pulse rectifier is only 7.57%, no need to take any filtering measures, suitable for ...

AI Technical Summary

Problems solved by technology

However, the structure of the 24-pulse transformer in the existing 24-pulse rectifier is relatively complicated, and six balance reactors need to be connected at the output end to ensure that the rectifier bridge works independently, and the system is relatively complicated

At present, 12-pulse and 18-pulse transformer rectifiers are still the most widely used in aviation, and 24-pulse transformer rectifiers have not been widely used.

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