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公开(公告)号：US11831158B2
公开(公告)日：2023-11-28
申请号：US16965383
申请日：2018-01-31
发明人： Feng Du , Wei Gang Chen , Zhen Liu , Yue Zhuo
CPC分类号： H02J3/0012 , G05B23/0221 , H02J3/381 , H02J13/00002 , H02J2300/24
摘要： Provided are a grid fault detection method and a device. The grid includes at least one AC power source provided by a public grid. The AC power source is coupled to a plurality of parallel circuits, each including 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 includes: selecting a first collection point 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 upon the input current being greater than the output current, it is determined that the plurality of parallel circuits are faulty. Accordingly, the plurality of collection points check the fault, so as to trigger a protection device.
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公开(公告)号：US11509143B2
公开(公告)日：2022-11-22
申请号：US16958246
申请日：2018-12-28
发明人： Feng Du , Wei Gang Chen , Zhen Liu , Yue Zhuo
摘要： A nanogrid and a virtual inverter controller for the nanogrid are disclosed. The nanogrid includes at least one parallel branch, and at least one branch is equipped with a protector. At least one of the protectors is equipped with one virtual inverter controller. The virtual inverter controller includes a sensor component configured to detect at least one characteristic parameter on the branch, and a control component affecting the electrical connection state of the corresponding protector of the virtual inverter controller according to the characteristic parameter.
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公开(公告)号：US11309706B2
公开(公告)日：2022-04-19
申请号：US16964273
申请日：2019-02-06
发明人： Feng Du , Yi Zhu , Wei Gang Chen , Zhen Liu , Yue Zhuo
摘要： Provided is a nano grid protection device for a nano grid including a distributed power supply, a large power grid including the nano grid protection device, and a method for controlling the nano grid protection device. In an embodiment, the nano grid is connected with a bus through the nano grid protection device and a main grid is connected with the bus through a main grid protection device. In an embodiment, the nano grid protection device includes: a signal unit, configured to detect and send current information passing through the nano grid protection device, the current information including the magnitude and direction of the current; a controller, configured to determine, based upon the received current information, whether to send a trip signal or not; and an execution mechanism, configured to execute a trip operation of the nano grid protection device upon receiving the trip signal.
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