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Twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation

A voltage-frequency conversion, matrix converter technology, applied in the direction of conversion equipment that can be converted to DC without intermediate conversion, can solve the problems of increasing system volume, weight, reducing system reliability, etc., to simplify system design and avoid intermediate Energy storage link, small volume effect

Inactive Publication Date: 2009-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when designing most AC motor control systems, the excitation winding adjustment circuit and the main power conversion circuit are designed independently, which not only increases the excitation source, but also increases the volume and weight of the system and reduces the reliability of the system.

Method used

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  • Twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation
  • Twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation
  • Twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0018] like figure 1 As shown in the present invention, a two-stage matrix converter topology with dual functions of DC excitation regulation and input and output voltage frequency conversion. This topology has an equivalent DC bus, and the sequence connected to both ends of the DC bus from the input side to the output side is: bidirectional switch (S up , S vp , S wp , S un , S vn , S wn ) composed of a three-phase full-bridge structure 1, a snubber circuit with voltage spike suppression 2 and a one-way switch (S ap , S bp , S cp , S an , S bn , S cn , S f1 , S f2 , S f3 , S f4 ) and freewheeling diode (D ap 、D bp 、D cp 、D an 、D bn 、D cn 、D f1 、D f2 、D f3 、D f4 ) composed of five-arm structure 3.

[0019] The bidirectional switch (S up , S vp , S wp , S un , S vn , S wn ) generally has four structures such as figure 2 shown. The...

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Abstract

The invention discloses a twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation, comprising a three-phase bridge type structure formed by two-way power switches, a buffer circuit, a five-bridge-arm structure formed by one-way power switch tubes and two equivalent direct current buses, wherein the three-phase bridge type structure, the buffer circuit and the five-bridge-arm structure are connected between the two equivalent direct current buses in parallel. The invention has the advantages of small volume, light weight, compact structure, little harmonic content and high efficiency.

Description

technical field [0001] The invention relates to a two-stage matrix converter with DC excitation regulation and voltage-frequency conversion, belonging to the technical field of converters controlled by AC motors. Background technique [0002] The AC motor with DC excitation function can easily adjust the magnetic field inside the motor by controlling the DC excitation current. When this type of motor is used as a motor, it has a wider range of speed regulation and good control performance; when used as a generator, by adjusting the excitation magnetic field, it can ensure that the generator maintains a normal output voltage when the load changes. In addition, this type of motor has a self-demagnetization function during power generation operation, which improves the reliability of the system operation. This type of motor is divided into electric excitation structure and hybrid excitation structure from the motor structure. In addition to the armature winding, the electric ...

Claims

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Application Information

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IPC IPC(8): H02M5/22
Inventor 史明明周波魏佳丹李全春毛怡然
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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