Four-quadrant current source converter based on autotransformer

A technology of current source converter and autotransformer, applied in the direction of transformer/inductor core, transformer/inductor coil/winding/connection, transformer/inductor components, etc. Large volume, inconvenient use and other problems, to achieve the effect of suppressing harmonics, reducing volume and capacity
CN105915079APending Publication Date: 2016-08-31GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
Publication Date
2016-08-31

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Abstract

The invention provides a four-quadrant current source converter based on an autotransformer. The four-quadrant current source converter comprises the autotransformer, an AC power source, an inductor, a first three-phase rectifier bridge, a second three-phase rectifier bridge and a DC harmonic injection circuit, wherein the first three-phase rectifier bridge is connected in parallel with the second three-phase rectifier bridge; and the input end of the autotransformer is connected with the output end of the AC power source via the inductor, the output end of the autotransformer is connected with the input end of the first three-phase rectifier bridge and the input end of the second three-phase rectifier bridge, and the output end of the first three-phase rectifier bridge and the output end of the second three-phase rectifier bridge are connected with the DC harmonic injection circuit. According to the invention, a main topology employs the autotransformer as a base, the DC injection circuit is connected through the two three-phase bridges, through controlling injection currents of a DC circuit, output currents of the autotransformer are modulated, and thus the purpose of inhibiting harmonic waves is realized.
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Description

technical field

[0001] The invention relates to a current source converter, in particular to a four-quadrant current source converter based on an autotransformer. Background technique

[0002] Two three-phase full-bridge converters are connected in parallel or in series through a Δ-Y, Y-Y-connected isolation transformer. The traditional 12-pulse converter can reduce harmonics to a certain extent, but the rated capacity of the rectifier transformer is higher than the output The capacity is high, so the isolation transformer is replaced by an autotransformer to reduce the winding capacity of the transformer. In addition, a large number of PWM technology is used in the commutation circuit to effectively adjust the output voltage, so that the output current is close to a sine wave, but its disadvantages are high cost, large switching loss, and low efficiency.

[0003] At present, autotransformers used as high-voltage transformers are generally used in high-voltage power transmi...

Claims

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