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Short-circuit current rectifier device protection device for bidirectional converter

A bidirectional converter and rectifier technology, which is applied in electrical components, output power conversion devices, and AC power input to DC power output, etc. damage, not properly resolved and other problems, to facilitate large-scale promotion and application, reduce installation volume, and ingenious overall design

Active Publication Date: 2017-05-10
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traction power supply system of urban rail transit still generally adopts the power supply method of diode rectifier unit. This power supply method has the following disadvantages: 1. The output DC voltage fluctuates greatly; 2. It cannot handle regenerative braking energy; 3. The system power factor is not good. control; the high-power traction power supply bidirectional converter composed of fully-controlled power electronic devices IGBT can completely solve the shortcomings of the above-mentioned diode rectifier units
Due to the structural differences between the IGBT and the rectifier device, the freewheeling diode I of the IGBT 2 The t parameter will be far from meeting the short-circuit current withstand requirements. If no measures are taken, the power device IGBT will be damaged or even damaged due to thermal effects.
Due to the unavoidable short-circuit fault of the rail traction power supply device, although the bidirectional converter can solve the shortcomings of the diode rectifier, if the tolerance problem of the power device during the short circuit cannot be solved, the bidirectional converter will not be popularized in industrial applications
For this problem, those skilled in the art try new scheme all the time, but this problem has not been properly solved

Method used

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  • Short-circuit current rectifier device protection device for bidirectional converter
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  • Short-circuit current rectifier device protection device for bidirectional converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: see figure 1 , a bidirectional converter short-circuit current rectifier device protection device, the protection device includes a set of rectifier devices D1-D4, the power device IGBT is 1#IGBTA1-1#IGBTA4, 2#IGBTA1-2#IGBTA4, clamping diode D11, D12, D21, D22 and support capacitors C13, C14, the rectifier devices D1-D4 are connected in parallel with the power device IGBT to form two groups of uncontrolled rectifier bridge arms, the support capacitors are connected in parallel with the power device IGBT; the rectifier device Including rectifier devices D1, D2, D3, D4, among which the rectifier devices D1, D2, D3, D4 are all connected in parallel with IGBT, one end of the rectifier devices D1, D2, D3, D4 is connected to the DC bus, and the other end is connected to the AC incoming line AC , the support capacitance includes a support capacitor C13 and a support capacitor C14, the support capacitor C13 and the support capacitor C14 are connected in parallel w...

Embodiment 2

[0021] Example 2: see figure 1 , as an improvement of the present invention, the impedance value of the DC bus connected to the rectifiers D1, D2, D3, D4 is less than 0.1mΩ, which can ensure the high current tolerance when the DC side is short-circuited, and the power in normal working state The IGBT of the device is normally triggered, which is used to complete the DC voltage output, braking energy feedback, and system reactive power compensation. At this time, the load current is mainly controlled and regulated by the IGBT loop trigger.

Embodiment 3

[0022] Embodiment 3: see figure 1 , figure 2 It is the working principle diagram of the short-circuit current withstand protection device of the bidirectional converter. At this time, a short-circuit fault occurs on the DC side. Due to the short protection response time of the IGBT, the IGBT blocks the trigger pulse, that is, the IGBT is in the open circuit state, and the short-circuit point still exists. At this time, the short-circuit current is mainly provided by the rectifier devices D1-D4, 1#IGBTA1-1#IGBTA4 and 2#IGBTA1-2#IGBTA4. Due to the structural differences between the IGBT and the rectifier device, the freewheeling diode I of the IGBT 2 The t parameter is too small to withstand long-term high current, so the short-circuit current is mainly provided by the rectifier devices D1-D4 with small internal resistance. In order to ensure that the large current under this working condition is mainly provided by the rectifiers D1-D4, the following measures should be taken: ...

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PUM

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Abstract

The invention relates to a short-circuit current rectifier device protection device for a bidirectional converter. The protection device is characterized by comprising a set of rectifier devices, power device IGBTs, clamping diodes and support capacitors, wherein the rectifier devices are connected with the power device IGBTs in parallel to form two groups of uncontrolled rectifier bridge arms; and the support capacitors are connected with the power device IGBTs in parallel. According to the protection device, the condition that short-circuit current flows through the rectifier devices can be effectively ensured, the current flowing through fly-wheel diodes of the IGBTs is reduced to a tolerable range and the IGBTs are effectively prevented from being damaged.

Description

technical field [0001] The invention relates to a protection device, in particular to a protection device for a short-circuit current rectifying device of a bidirectional converter, and belongs to the technical field of rail transit power supply devices. Background technique [0002] In the rail transit system, traction power supply, as the core and power source, plays an extremely critical role in the overall system. At present, the traction power supply system of urban rail transit still generally adopts the power supply method of diode rectifier unit. This power supply method has the following disadvantages: 1. The output DC voltage fluctuates greatly; 2. It cannot handle regenerative braking energy; 3. The system power factor is not good. control; the high-power traction power supply bidirectional converter composed of fully-controlled power electronic devices IGBT can completely solve the shortcomings of the above-mentioned diode rectifier unit. [0003] Due to the par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M1/32
CPCH02M1/32H02M7/125H02M1/325
Inventor 谭国俊李浩李辉杨波郑旺丁玉侠张祖亚耿程飞
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO