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:
Apr. 07, 2026
Filed:
Dec. 14, 2022
North China Electric Power University, Beijing, CN;
Jing MA, Beijing, CN;
Wenyue Zhao, Beijing, CN;
Zhencun Nie, Beijing, CN;
Jialun Li, Beijing, CN;
Yuchong Wu, Beijing, CN;
Zengping Wang, Beijing, CN;
SHANGHAI UNIVERSITY OF ELECTRIC POWER, Shanghai, CN;
STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER COMPANY, Shanghai, CN;
NORTH CHINA ELECTRIC POWER UNIVERSITY, Beijing, CN;
Abstract
The application relates to a method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance. The method comprises: Obtaining a conduction state information of a converter and characteristic parameters of a converter circuit within one commutation period after a fault occurs; according to the conduction state information and characteristic parameters, determining characteristic frequency of the circuit; according to the characteristic frequency and characteristic parameters, determining a virtual grounding resistance; according to the virtual grounding resistance, determining fault areas.