The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 2024
Filed:
Jul. 01, 2022
Beijing Jiaotong University, Beijing, CN;
Meng Li, Beijing, CN;
Jinghan He, Beijing, CN;
Keao Chen, Beijing, CN;
Dahai Zhang, Beijing, CN;
Pinghao Ni, Beijing, CN;
Yin Xu, Beijing, CN;
Xiaojun Wang, Beijing, CN;
Guomin Luo, Beijing, CN;
Xiangyu Wu, Beijing, CN;
Fang Zhang, Beijing, CN;
Beijing Jiaotong University, Beijing, CN;
Abstract
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.