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Adaptive Reclosing Scheme Based on Traveling Wave Injection For multi-terminal dc grids

Energy Engineering 2023年第5期120卷 1271-1285页

作者： Peng Han Xinchen Zhao YannanWu Zhiyu Zhou Qi Qi State grid Beijing Electric Power Company Beijing100031China State grid Beijing Tongzhou Electric Power Supply Company Beijing101101China State Key Laboratory of Alternate Electrical Power Systemwith Renewable Energy Sources North China Electric Power UniversityBeijing102206China

The hybrid dc circuit breaker(HCB)has the advantages of fast action speed and low operating loss,which is an idealmethod for fault isolation ofmulti-terminal dc ***-terminal dc grids that transmit power through overhead lines,HCBs are required to have reclosing capability due to the high fault probability and the fact that most of the faults are temporary *** avoid the secondary fault strike and equipment damage that may be caused by the reclosing of the HCB when the permanent fault occurs,an adaptive reclosing scheme based on traveling wave injection is proposed in this *** scheme injects traveling wave signal into the fault dc line through the additionally configured auxiliary discharge branch in the HCB,and then uses the reflection characteristic of the traveling wave signal on the dc line to identify temporary and permanent faults,to be able to realize fast reclosing when the temporary fault occurs and reliably avoid reclosing after the permanent fault *** test results in the simulation model of the four-terminal dc grid show that the proposed adaptive reclosing scheme can quickly and reliably identify temporary and permanent faults,greatly shorten the power outage time of temporary *** addition,it has the advantages of easiness to implement,high reliability,robustness to high-resistance fault and no dead zone,etc.

关键词： multi-terminal dc grid hybrid dc circuit breaker adaptive reclosing fault type identification traveling wave reflection characteristic

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A comprehensive review of dc fault protection methods in HVdc transmission systems

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Protection and Control of Modern Power Systems 2021年第1期6卷 1-20页

作者： Mohan Muniappan Senior Research Specialist Center for Future Energy Systems(CFES)Rensselaer Polytechnic Institute(RPI)TroyNew YorkUSA

High voltage direct current (HVdc) transmission is an economical option for transmitting a large amount of power over long distances. Initially, HVdc was developed using thyristor-based current source converters (CSC). With the development of semiconductor devices, a voltage source converter (VSC)-based HVdc system was introduced, and has been widely applied to integrate large-scale renewables and network interconnection. However, the VSC-based HVdc system is vulnerable to dc faults and its protection becomes ever more important with the fast growth in number of installations. In this paper, detailed characteristics of dc faults in the VSC-HVdc system are presented. The dc fault current has a large peak and steady values within a few milliseconds and thus high-speed fault detection and isolation methods are required in an HVdc grid. Therefore, development of the protection scheme for a multi-terminal VSC-based HVdc system is challenging. Various methods have been developed and this paper presents a comprehensive review of the different techniques for dc fault detection, location and isolation in both CSC and VSC-based HVdc transmission systems in two-terminal and multi-terminal network configurations.

关键词： HVdc VSC multi-terminal dc grid dc fault Fault detection and location Fault isolation

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