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This paper proposes a new partition principle based on bus sequence voltage distribution characteristic for wide area protection system. The influence of short lines, multiple fault and high resistance ground faults are analyzed. Information from multiple points within wide area network is supervised by central station of protection system. Then, suspected faulty zone can be detected according to...
This paper proposes a novel wide area back-up protection algorithm that measures synchronized information from different buses in region. The amplitude of voltage fault component from different buses is compared, and the bus with maximum magnitude will be selected. Hence, suspected fault line set could be established according to the sub-graph and complete incidence matrix of selected buses. Then,...
The high voltage variable frequency system has complicated structure and high power density. It comprises industrial frequency AC, DC and variable frequency AC. All of these bring new challenges to the system's protection and stability control. This paper considered the protection strategy in two aspects: device-level protection and system-level protection. Through improving the circuit structure...
The protection device is the assurance for high temperature superconducting (HTS) cablepsilas safe operation in power grid. The paper introduces a protection device for HTS cable, which provides both functions of protection and monitoring. In this paper, hardware structure of the protection device and the protection scheme are presented, then a thermal balance model of HTS cable on quench is proposed,...
In order to incarnate area wide protection in engineering application and improve the capability of relay protection, the paper refers to regional intelligent protection system. In compared with wide area protection, regional intelligent protection system pays attention to improving the capability of relay protection by using regional power network information. In regional intelligent protection system,...
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