POWER CONVERTER AND CONTROL METHOD THEREFOR

Title:

POWER CONVERTER AND CONTROL METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2020/223883

Kind Code:

A1

Abstract:

A power converter and its control method are provided. The power converter (14) includes: a power conversion circuit (140) having a first terminal set (141) and a second terminal set (142), being configured to convert power input via one of the first terminal set (141) and the second terminal set (142) and output the converted power via the other of the first terminal set (141) and the second terminal set (142); a measurement unit (143), being configured to measure voltage/current at a point on a first network (11) linking a first power source (10) and the first terminal set (141) of the power conversion circuit (140), wherein the point is arranged between a circuit breaker inserted in the first network (11) and the first terminal set (141) of the power conversion circuit (140); a controller, being configured to control the power conversion circuit (140) to: generate a voltage/current waveform travelling along the first network (11) with a power supplied by a second power source (12) linked to the second terminal set (142) of the power conversion circuit (140) in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; identify the voltage/current waveform from the measurements of the measurement unit (143); and locate a fault on the first network (11) in consideration of an interval between a first timing when the controller identifies the voltage/current waveform and a second timing when the controller identifies an echo of the voltage/current waveform. By using the solution according to present invention, the power conversion circuit (140) can be re-used for different modes of operation either for power transmission under normal condition or for fault location under fault condition. This is helpful for realizing single-end travelling wave phase to phase fault location via control of the converter at SOP. With the proposed protection solution, additional breakers are not required when a conventional radial type distributed network system is upgraded to the dual power supply system with SOP. The solution is helpful for decreasing the implementation difficulty of the SOP solution.

Inventors:

YANG XIAOBO (CN)
LIU KAI (CN)
YUAN CHUNMING (CN)
XIE HAILIAN (CN)
HUANG XING (CN)

Application Number:

PCT/CN2019/085732

Publication Date:

November 12, 2020

Filing Date:

May 06, 2019

Export Citation:

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Assignee:

ABB SCHWEIZ AG (CH)
YANG XIAOBO (CN)
LIU KAI (CN)
YUAN CHUNMING (CN)
XIE HAILIAN (CN)
HUANG XING (CN)

International Classes:

H02J3/36

Foreign References:

US9819188B1	2017-11-14
CN106605152A	2017-04-26
CN104426343A	2015-03-18
US20150333637A1	2015-11-19
CN105259476A	2016-01-20

Other References: