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Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof

A bidirectional converter and high-voltage cascading technology, which is applied in the direction of conversion equipment for intermediate conversion to direct current, can solve problems such as poor reliability, large size, and complex structure, and achieve reduced volume and loss, efficient conversion and transmission, The effect of improving power quality

Active Publication Date: 2015-01-07
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure still uses multiple phase-shifting transformers, which has the disadvantages of complex structure, large volume, low efficiency, and poor reliability.
At the same time, the front stage adopts uncontrollable rectification, which has high harmonic content

Method used

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  • Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof
  • Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof
  • Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof

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Embodiment Construction

[0025] like figure 2As shown, a three-phase high-voltage cascaded AC-DC-AC bidirectional converter according to an embodiment of the present invention includes three input filter inductors, an input cascaded multilevel PWM rectifier, and an output cascaded multilevel PWM inverter and three output filter inductors, the input side cascaded multilevel PWM rectifier is connected to the power grid through the input filter inductor, and the output side cascaded multilevel PWM inverter is connected to the load or the lower power grid through the output filter inductor. The basic cascaded unit of this structure is two single-phase bridge inverters connected back to back. By adopting multi-level PWM modulation technology, the single-phase bridge inverters on the input side are connected in series to realize high-voltage rectification, and the single-phase bridge inverters on the output side are connected in series to realize high-voltage output. Similarly, the structures of the other...

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Abstract

The invention discloses a three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and a control method thereof. The basic cascade unit consists of two back-to-back single-phase bridge type inverters, wherein one single-phase bridge type inverter is used for carrying out PWM (Pulse-Width-Modulation) rectification and voltage stabilization to absorb energy, and the other single-phase bridge type inverter is used for carrying PWM inversion to release energy so as to realize transferring of active energy; and the input stages and the output stages of N cascade units are respectively connected in series, and input cascade multilevel PWM rectification and output cascade multilevel PWM inversion are realized by adopting a multilevel PWM technology. For the structure, high-voltage AC-AC conversion can be directly realized, and two-way flowing of energy can be realized, so that the structure can be widely applied in high-voltage frequency conversion. Compared with the traditional high-voltage frequency converter, the high-voltage cascade type AC-DC-AC bidirectional converter has the advantages that a phase-shifting transformer is not needed, so that high-voltage conversion can be directly carried out; and a PWM (Pulse-Width-Modulation) rectifying technology is adopted, so that rectification with high-power factor is realized and the power quality of a power distribution network is improved.

Description

technical field [0001] The invention relates to a three-phase converter, in particular to a high-power three-phase high-voltage cascaded AC-DC-AC bidirectional converter and a control method thereof. Background technique [0002] Traditional AC voltage conversion adopts electromagnetic transformer technology. Low-frequency electromagnetic transformers are widely used in industrial and mining enterprises, scientific research institutes, and university laboratories. They realize AC / AC voltage transformation and electrical isolation and other functions, and have high power transfer efficiency. However, traditional electromagnetic transformers are bulky and bulky, have loud audio noise, no voltage stabilization function, and serious harmonic pollution to the power grid when supplying power to nonlinear loads (such as typical diode rectification and capacitor filter circuits), which cannot meet the miniaturization of electrical and electronic equipment. needs. [0003] With the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44
Inventor 罗安马伏军刘月华何志兴胡龙熊桥坡
Owner HUNAN UNIV
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