Beijing Jiaotong University

Keao Chen

Meng Li

Fang Zhang

Xiaojun Wang

Pinghao Ni

Guomin Luo

Xiangyu Wu

Yin Xu

Jinghan He

Dahai Zhang

The present disclosure relates to a method for protecting DC line impedance phase based on protection and control coordination, and an application scenario of the method for protecting is a three-terminal flexible DC transmission network. The method uses high controllability of a converter after a fault, injects a characteristic signal at a characteristic frequency, and calculates a phase angle of input impedance to determine a fault interval, which effectively improves protection performance, turns passive to active, and is not affected by nonlinearity of the converter. At the same time, compared with a full-bridge MMC, using a half-bridge MMC does not need to perform fault ride-through first when identifying a fault, and does not need to add additional equipment, it creates fault features and can reliably identify an fault interval; improves protection quickness and at the same time also has better economic benefits. It has selectivity, and an entire system may not be shut down due to failure of a single line.

Method for protecting DC line impedance phase based on protection and control coordination

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Beijing, China

Keao Chen