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Reliable Phase Selection Method for Transmission Systems Based on Relative Angles Between Sequence Voltages

Journal of Modern Power Systems and Clean Energy 2024年第5期12卷 1431-1444页

作者： Abdallah A.Aboelnaga Maher A.Azzouz the Department of Electrical and Computer Engineer ing University of WindsorWindsorON N9B 3P4Canada Electrical Power and Machines Department Faculty of EngineeringAin Shams UniversityCairo 11566Egypt the Electrical Engineering Department Qatar UniversityDohaQatar

fault currents emanating from inverter-based resources(IBRs)are controlled to follow specific references to support the power grid during ***,these fault currents differ from the typical fault currents fed by synchronous generators,resulting in an improper operation of conventional phase selection methods(PSMs).In this paper,the relative angles between sequence voltages measured at the relay location are determined analytically in two stages:(1)a short-circuit analysis is performed at the fault location to determine the relative angles between sequence voltages;and(2)an analysis of the impact of transmission line on the phase difference between the sequence voltages of relay and fault is conducted for different IBR ***,new PSM zones based on relative angles between sequence voltages are devised to facilitate accurate PSM regardless of the fault currents,resistances,or locations of *** time-domain simulations confirm the accuracy of the proposed PSM with different fault locations,resistances,types,and currents.

关键词： fault resilience fault type identification phase selection method inverter-based resource control function renewable energy source sequence voltage

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Adaptive Reclosing Scheme Based on Traveling Wave Injection For Multi-Terminal dc Grids

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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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