Unlock instant, AI-driven research and patent intelligence for your innovation.

Modular multilevel converter power module topology with passive overvoltage protection

A modular multi-level, power module technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as endangering the safety of flexible DC transmission converter valves, breaking the current path of the bridge arm, and damaging the power module. To achieve the effect of avoiding the overall locking of the bridge arm, avoiding current interruption, and preventing false conduction

Pending Publication Date: 2020-01-10
CSG EHV POWER TRANSMISSION +2
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the bypass switch fails to operate or the power module cannot issue a command to close the bypass switch due to faults such as a black module, the power module cannot enter the bypass state, and its DC capacitor will be continuously charged, resulting in the power module being charged due to capacitance. When the voltage is too high, it will be damaged or even explode, which will cut off the current path of the bridge arm, thus endangering the safety of the flexible HVDC converter valve.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modular multilevel converter power module topology with passive overvoltage protection
  • Modular multilevel converter power module topology with passive overvoltage protection
  • Modular multilevel converter power module topology with passive overvoltage protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 , a modular multilevel converter power module topology with passive overvoltage protection, the principle of which is to connect a bidirectional electronic switch 2 in parallel with the power output port 1 of the power module. When the bypass switch 6 refuses to operate, or the power module 3 is in a black module state, the bridge arm current will charge the capacitor C of the power module. When the capacitor voltage is higher than the withstand voltage of the bidirectional electronic switch 2, the bidirectional electronic switch 2 will After being broken down, the bidirectional electronic switch 2 presents a short-circuit state after breakdown, thereby providing a path for the continuity of the bridge arm current, thereby keeping the bridge arm current link unimpeded. Since there is no need to actively monitor the module capacitor voltage or apply trigger pulses to parallel electronic switches during the protection process, the power module overvoltag...

Embodiment 2

[0032] Embodiment 2 is similar to Embodiment 1, except that Embodiment 2 provides an overvoltage protection topology of a half-bridge power module, which is characterized in that a bidirectional electronic switch 2 is connected in parallel to the power output port of the half-bridge power module 4 .

[0033] Preferably, in Embodiment 1 and Embodiment 2, the bidirectional electronic switch 2 is replaced by two anti-parallel electronic switches. Electronic switches connected in parallel in one direction.

Embodiment 3

[0035] refer to image 3 , image 3 The feature is that a one-way electronic switch 5 is connected in parallel with the power output port 1 of the full bridge power module 3, the anode of the electronic switch is connected to the high voltage end of the module power output port 1, and the cathode of the electronic switch is connected to the low voltage end of the module power output port.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a modular multilevel converter power module topology with passive overvoltage protection. The improved topology of the half-bridge power module is that a one-way electronic switch is connected in parallel to the power output port of the half-bridge power module. The anode of the electronic switch is connected with the high-voltage end of the module power output port. The cathode of the electronic switch is connected with the low-voltage end of the module power output port. The driving gate of the electronic switch and the cathode of the electronic switch are internallyor externally shorted. Another improved topology of the half-bridge power module is that a bidirectional electronic switch is connected in parallel to the power output port of the half-bridge power module. The driving gate of the electronic switch and the cathode of the electronic switch are shorted internally or externally. The improved topology of the full-bridge power module is that a bidirectional electronic switch is connected in parallel to the power output port of the full-bridge power module. The driving gate of the electronic switch and the cathode of the electronic switch are shortedinternally or externally.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a power module topology of a modular multilevel converter with passive overvoltage protection. Background technique [0002] Modular multilevel converters usually connect a mechanical bypass switch to the power output port of the power module in parallel, so that when the power module fails, the power module is bypassed by closing the mechanical bypass switch, thereby maintaining the bridge arm The current path is unblocked. [0003] When the bypass switch fails to operate or the power module cannot issue a command to close the bypass switch due to faults such as a black module, the power module cannot enter the bypass state, and its DC capacitor will be continuously charged, resulting in the power module being charged due to capacitance. When the voltage is too high, it will be damaged or even exploded, which will cut off the current path of the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/325
Inventor 周竞宇任成林林卫星
Owner CSG EHV POWER TRANSMISSION