Beijing Sifang Automation Co., Ltd.

Beijing Sifang Engineering Co., Ltd.

State Grid Corporation of China

Gang Duan

Jingtao Wu

Wei Zhang

Qi Zhang

Xiaoyan Sun

Liangliang Zheng

Dong Yan Yang

Fang Li

Fang Tian

Jianfeng Yan

Yu Dong

Yuhan Zhang

Nian Liu

Xiaonan Lou

Yaozhong Xin

Hongzhu Tao

The disclosure provides a method for fast reconfiguration of power supply grid in tens of milliseconds after power grid failure. The master station of fast reconfiguration of power grid concentrates the network status information from the client stations at transformer substations or power plants, and compares it with the built-in control strategy table which deals with possible faults. When an expected power gird disconnection fault is detected, the pre-start switch-on instruction is sent to the client stations with multiple breakers which can reconnect the grid. When the fault is cleared, the client stations shall identify the fault clearing time according to the local information, and send the instruction of synchronous switch-on to the corresponding local breakers which can reconnect the separated grids. At the same time, the master station independently monitors the removal of the fault, and sends the backup switch-on signal with synchronism check to the corresponding breakers which can reconnect the separated grids. Based on the above mechanism, the disconnected grid can be reconnected within 150 ms after disconnecting. After the interconnection of the grid is restored, the breakers that form the electromagnetic ring network switch off.

Method and system for fast reconfiguration of power supply network in tens of milliseconos after power grid failure

A state-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without Phasor Measurement Unit(PMU) is only dependent on real-time measurement dynamic data of measurement nodes with PMU and measurement data of Supervisory Control And Data Acquisition (SCADA) system in electric power system or state estimation data. According to the SCADA measurement data or state estimation data at some continuous moments, the method utilizes recursive least squares solution to find a linear combination relationship between variation of measurement parameter to be estimated of nodes without PMU and variation of corresponding measurement parameter of nodes with PMU. Using the linear combination of relationship, the dynamic process of measurement nodes without PMU is estimated in real-time. The method provides high estimation precision and meets error requirements of engineering application.

State-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without PMU

A method and a system for a comprehensive analysis of low frequency oscillation. The method includes: firstly, initiating a wide area measurement system WAMS () to perform real-time monitoring; transmitting real-time low frequency oscillation information to a dynamic early-warning system () periodically; then converting the low frequency oscillation information received by the dynamic early-warning system () into an input file for stability calculation with small disturbance, and performing related calculation; finally, transmitting the calculated result back to the wide area measurement system WAMS () and a human-machine system interface for output. The system includes: the wide area measurement system WAMS (), the dynamic early-warning system (), a system for stability calculation with small disturbance () and an output system ().

Method and system for a comprehensive analysis of low frequency oscillation

Growing community of inventors

Beijing, China

Gang Duan