Direct current circuit breaker and its implementation

Patent metadata

Field	Value
Publication number	US-10707674-B2
Application number	US-201314771105-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Feb 27, 2013
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

The present invention provides a direct current circuit breaker and its implementation method, which includes a cutout circuit, a commutation circuit and a energy absorption circuit connected in parallel. Through using power semiconductor switch module to cut off the current, it will have a quickly action, without generating electric arc, while the modular construction also reduces the consistency requirements of the power electronic component.

First claim

The invention claimed is:

1. A direct current circuit breaker, said breaker includes a cutout circuit, a commutation circuit and an energy absorption circuit connected in parallel, is characterized that, said cutout circuit includes a cutout inductance and a cutout unit connected in series; said commutation circuit includes a commutation inductance, a commutation unit and a mechanical switch connected in series, wherein a full bridge structure converter includes a capacitor and a H bridge structure power semiconductor switch module; said H bridge structure power semiconductor switch module includes four power semiconductor switch modules; each two are in series together and constitute a branch, two branches are parallel, and respectively, extract an intermediate point of the two branches as an input end and output end; and said capacitor connects to the power semiconductor switch module branch.

2. The direct current circuit breaker according to claim 1 , is characterized that, said cutout unit and commutation unit all include a half/full bridge structure converter; the number of converters included in the cutout unit is greater than the number of converters in the commutation unit.

3. The direct current circuit breaker according to claim 2 , is characterized that, said H bridge structure power semiconductor switch module includes four diodes and
at least one power semiconductor switch;
each two diodes are in series that consists a branch, two branches are parallel, and the intermediate point of the two branches is extracted as the input end or output end; the H bridge structure power semiconductor switch is connected in parallel with the capacitor.

4. The direct current circuit breaker according to claim 2 , is characterized that, said half bridge structure converter includes two power semiconductor switch modules
and at least one capacitor; said two power semiconductor switch modules are coupled in series and, parallel with the capacitor; the intermediate point between one end of the capacitor and power semiconductor switch module in series is as the input end or the output end.

5. An application method of a direct current circuit breaker, is characterized that, said method includes the steps of:
(a) controlling, by a control circuit, a converter of a commutation unit and a mechanical switch;
(b) testing, by the control circuit, a current value of every path, when the current value exceeds a first current limit, triggering, by the control circuit, the converter of a cutout unit if the signal to lock the converter of the commutation unit is received, then the converter of the commutation unit is locked; the capacitors of a commutation inductance and the commutation unit form the oscillation to move the current into the cutout unit; and
(c) turning off said mechanical switch.

6. The application method according to claim 5 , is characterized that, determining a first specific number based on the current limit level.

7. The application method according to claim 5 , characterized that, monitoring a heat of the energy absorption circuit corresponding to the locking cutout unit converter.

8. The application method of claim 5 , wherein when the current value exceeding the current limit in said current path, handling a first specific number of said at least two devices, and locking the corresponding cutout unit converter to make the current reverse to said corresponding energy absorption circuit.

9. The application method of the direct current circuit breaker according to claim 5 , is characterized that,
if step (b) exceeds a first current limit, sending the signal to turn off the converter of said commutation unit.

10. The application method of the direct current circuit breaker according to claim 5 , is characterized that turning off said mechanical switch after a first period time from locking said commutation unit.

11. The application method of the direct current circuit breaker according to claim 5 , is characterized that, after closing the mechanical switch and unlocking said commutation unit converter, receiving the turn off signal of the commutation unit converter.

Assignees

• State Grid Corp China
• State Grid Smart Grid Res Institute
• China Electric Power Res Inst
• North China Grid Company Ltd
• State Grid Coop Of China Co Ltd

Inventors

• Tang Guangfu
• Gao Chong
• Luo Xiang
• Wei Xiaoguang
• Qiu Yufeng
• Cao Junzheng

Classifications

• H01H33/596 Primary

  for interrupting DC · CPC title

• H02H9/02

  responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} · CPC title

• H02J1/00

  Circuit arrangements for DC mains or DC distribution networks · CPC title

• H02H7/268

  for DC systems · CPC title

• H02H3/08

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title