24 pulse aviation self-coupling transformer rectifier based on star-shaped primary-side winding phase shift

Abstract

The present invention discloses a 24 pulse aviation self-coupling transformer rectifier based on star-shaped primary-side winding phase shift. The 24 pulse aviation self-coupling transformer rectifier comprises a star-shaped primary-side winding phase shift self-coupling transformer as well as first, second, third and fourth three-phase rectifiers, wherein the star-shaped primary-side winding phase shift self-coupling transformer comprises a phase A, a phase B and a phase C, and the primary sides of the three phases respectively comprise a pair of long and short windings and are connected with one another to form a star-shaped structure; and the secondary side of each phase comprises four secondary side windings, the turn number of the winding is reasonably designed, and three-phase alternating-circuit output with mutual phase shit of the four groups with 15 degrees is realized by utilizing the sum of phasors of secondary side voltage and primary side voltage. The 24 pulse aviation self-coupling transformer rectifier has a simple structure and is low in content of input harmonic waves, small in amount of transformer windings, small in volume and light in weight.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion, and in particular relates to a 24-pulse aviation autotransformer rectifier based on star-shaped primary winding phase shifting. Background technique [0002] In the field of power frequency rectification, multi-pulse rectification technology is an important method to reduce the harmonic content of grid-side current. The traditional 12-pulse transformer rectifier uses the Y-type and △-type connection methods of the secondary winding of the isolation transformer to generate a 30° phase shift for the two sets of three-phase voltages. After uncontrolled rectification, it outputs DC with 12 pulses in parallel. The power supply eliminates the 5th and 7th harmonic components in the input current. This scheme has a simple structure, high reliability and overload capability, but its transformer equivalent capacity is relatively large, which is 1.03 times of the output power. Autotrans...

AI Technical Summary

Problems solved by technology

[0003] Regardless of whether it is an isolated or self-coupling 12-pulse rectifier, the total harmonic content (THD) of the input current reaches 15%, which is difficult to meet the increasing harmonic requirements of the input current, such as the civil aviation airworthiness standard RTCA DO-160E and the national military standard GJB181A-2003 stipulates that the root mean square value of the total distortion current of AC power equipment should not exceed 10% of the effective value of the fundamental current

Increasing the number of pulses can further reduce the input harmonic content and output pulsation coefficient. On the basis of the 12-pulse rectifier, change the structure of the autotransformer and add a set of output voltages to realize an 18-pulse variable voltage rectification system. However, its input current THD theory The value is 10.11%, which still exceeds the requirements of the harmonic standard

Based on the 24-pulse transformer rectification system with differential △ winding structure, the input current contains 24 step waves, which can further reduce the input current THD. However, the number of windings per phase of the transformer is large (7 groups), and the connection is more complicated

Images