State Grid Fujian Electric Power Co., Ltd.

Kehua Hengsheng Co., Ltd.

Zhangzhou Kehua Technology Co., Ltd.

State Grid Fujian Fuzhou Electric Power Supply Company

State Grid Info-Telecom Great Power Science and Technology Co., Ltd.

Xi Chen

Wei Chen

Chunbao Zeng

Wei Yu Lin

Baoshuai Jiao

Binbin Lin

Siyuan Qian

Lifan Yang

Haisen Chen

Yuanzheng Wang

Changgui Huang

Yuepian Ye

Ruyin Chen

Baoping Zou

Xiao Feng

Xinyi Lin

Kai Li

Jincheng Li

Gonghua Hou

Xincheng Huang

Jiefei Lin

A method and a system for switching from grid-connected to grid-disconnected, and a power conversion system are provided. The method includes determining whether a power grid is abnormal based on a power grid parameter obtained when a PCS is grid-connected and operates in a current source mode, turning off a switching cabinet if the power grid is abnormal, switching from a current source mode to a voltage source mode, sending a command to instruct a grid-connected/grid-disconnected switch to switch from a grid-connected loop to a grid-disconnected loop, controlling an output parameter to smoothly transit from an abnormal parameter value recorded when the power grid is abnormal to a rated parameter value, and supplying power to a load according to the rated parameter value. In this way, seamless switching from grid-connected to grid-disconnected can be achieved, thereby ensuring stability of power supply.

Method and system for switching from grid-connected to grid-disconnected and power conversion system

The present disclosure relates to a quantum key distribution (QKD) method based on a tree QKD network. The method includes: judging a position of a parent node of the source node Sand a position of a parent node of the destination node S; if the parent node is a trusted relay node, directly transferring an initial shared key of the source node Sand the parent node to the destination node Saccording to an exclusive OR (XOR) relay scheme, and ending the process; and if the parent node is an untrusted relay node, emitting, by the source node Sand the destination node S, photons to a measuring-device-independent quantum key distribution (MDI-QKD) receiver of the parent node through a QKD emitter, generating a shared key by an MDI-QKD method, then transmitting the shared key according to the XOR relay scheme, and ending the process.

Quantum key distribution method and system based on tree QKD network

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Fujian, China

Xi Chen