POWER GRID FAULT DETECTION METHOD AND DEVICE WITH DISTRIBUTED ENERGY RESOURCE

WIPO Patent Application WO/2019/148391

A1

Provided are a grid fault detection method and a device having a distributed energy resource. The grid (300) comprises at least one AC power source (UG 31) provided by a public grid. The AC power source is coupled to a plurality of parallel circuits, each parallel circuit comprising a plurality of parallel branches. The parallel branches are each connected with a load and/or a DC power source. The grid fault detection method having the distributed energy resource comprises the following steps: selecting a first collection point (b 3) between the AC power source and the plurality of parallel circuits, and collecting a current value and a current direction of the first collection point; comparing an output current and an input current of the first collection point, and if the input current is greater than the output current, it is determined that the plurality of parallel circuits are faulty. According to the grid fault detection method and device, the plurality of collection points can be set up to check the fault on the basis of a line connection of the grid having the distributed energy source, and to determine whether the fault is a blind spot fault, so as to trigger a protection device, thereby avoiding the misjudgment of the blind spot fault.

DU FENG (CN)
CHEN WEIGANG (CN)
LIU ZHEN (CN)
ZHUO YUE (CN)

PCT/CN2018/074814

August 08, 2019

January 31, 2018

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SIEMENS AG (DE)
DU FENG (CN)
CHEN WEIGANG (CN)
LIU ZHEN (CN)
ZHUO YUE (CN)

H02J3/00

CN105914776A	2016-08-31
CN102682980A	2012-09-19
CN103245873A	2013-08-14
CN101789596A	2010-07-28
US20140049115A1	2014-02-20

KANGXIN PARTNERS, P.C. (CN)

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