Symmetry control type three-phase three-level direct current converter and symmetry control method thereof

A converter, half-bridge three-level technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, etc., can solve problems such as difficult thermal design, reduction of switching tubes, and complex control circuits , to achieve the effect of reducing volume, reducing current stress and increasing pulsation frequency

Inactive Publication Date: 2011-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to reduce the current stress of the switch tube, multiple devices or modules can be connected i

Method used

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  • Symmetry control type three-phase three-level direct current converter and symmetry control method thereof
  • Symmetry control type three-phase three-level direct current converter and symmetry control method thereof
  • Symmetry control type three-phase three-level direct current converter and symmetry control method thereof

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with accompanying drawing.

[0016] Such as figure 1 As shown, the symmetrical control type three-phase three-level DC converter of the present invention is composed of a power supply circuit 1, a half-bridge three-level circuit 2, a full-bridge circuit 3, a three-phase isolation transformer 4 and a rectification filter circuit 5 connected in sequence, wherein : The primary winding of the three-phase isolation transformer 4 adopts a delta connection mode, and its secondary winding adopts a star connection mode; the rectification and filtering circuit 5 adopts a three-phase bridge rectification circuit.

[0017] The specific structure of the converter of the present invention is as follows:

[0018] The power supply circuit 1 includes a DC source V in and the first and second divider capacitors C d1 、C d2 , the first divider capacitor C d1 One end of the DC source V in The connection point of the ...

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Abstract

The invention discloses a symmetry control type three-phase three-level direct current converter and a symmetry control method thereof, belonging to the field of power electronic converters. The converter comprises a power circuit (1), a half-bridge three-level circuit (2), a full-bridge circuit (3), a three-phase isolation transformer (4) and a rectifier filter circuit (5) which are connected insequence. The converter is characterized in that all switching tubes in the converter have the same conduction time; the adjacent switching tubes are conducted in turn; and the turn-on time interval is 1/6 switching cycle. The converter has the following technical effects: the voltage stress of all the switching tubes in the converter is half the input voltage; the three-phase transformer and thesymmetry control mode improve the input and output current ripple frequency, thus reducing the volume of the input and output filters; and meanwhile, the current stress of the switching tubes is effectively reduced.

Description

technical field [0001] The invention relates to a symmetrically controlled three-phase three-level DC converter in a power converter and a control method thereof, belonging to the field of power electronic converters. Background technique [0002] With the wide application of various power electronic devices, people put forward strict requirements on the power quality of power conversion devices using mains power. The International Electrotechnical Commission has formulated corresponding standards to limit the harmonic content, which requires the use of power factor correction technology for electrical devices. Medium and high-power high-frequency switching power supplies are generally three-phase 380VAC±20% input, and the rectified DC bus voltage will reach a maximum of about 640V. If the three-phase power factor technology is used, the DC bus voltage will usually reach 760-800V, or even as high as thousands of volts, which will greatly increase the voltage stress of the s...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335
Inventor 刘福鑫杨朔阮新波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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