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Impact of Grid Topology on pole-to-ground fault Current in Bipolar DC Grids:Mechanism and Evaluation

Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 434-445页

作者： Yingmin Zhang Wenxin Zhang Qiao Peng Baohong Li Yan Tao Min Zhang Tianqi Liu Frede Blaabjerg College of Electrical Engineering Sichuan UniversityChengdu 610065China Electric Power Research Institute State Grid Shanxi Electric Power CompanyTaiyuan 030001China AAU Energy Aalborg UniversityAalborg 9920Denmark

The fault current level analysis is important for bipolar direct current(DC)grids,which determines the operation and protection *** DC grid topology significantly impacts the current path and then the fault current level of the grid,which makes it possible to limit the fault current by optimizing the grid ***,the corresponding discussion in the literature is *** at this point,the impact of grid topology,i.e.,the connecting scheme of converters,on the pole-to-ground fault current in bipolar DC grids,is investigated in this paper,and the ground-return-based and metallic-return-based grounding schemes are considered,***,the decoupled equivalent model in frequency domain for fault current analysis is ***,the impacts of converters with different distances to the fault point on the fault current can be analyzed according to the high-frequency impedance *** on the analysis results,a simplified fault current index(SFCI)is proposed to realize the fast evaluation of impact of grid topology on the fault current *** SFCI is then applied to evaluate the relative fault current ***,the simulation results validate the model,the analysis method,and the SFCI,which can effectively evaluate the relative fault current level in a direct and fast manner.

关键词： Bipolar DC grid pole-to-ground fault grid topology fault current evaluation simplified fault current index

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fault Current and Voltage Estimation Method in Symmetrical Monopolar MMC-based DC Grids

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1401-1412页

作者： Jingqiu Yu Zheren Zhang Zheng Xu IEEE Department of Electrical Engineering Zhejiang UniversityHangzhouChina

Symmetrical monopolar configuration is the prevailing scheme configuration for modular multilevel converter based high-voltage direct current(MMC-HVDC) links, in which severe DC overvoltage or overcurrent can be caused by the DC faults. To deal with the possible asymmetry in the DC faults and the coupling effects of the DC lines, this paper analyzes the DC fault characteristics based on the phase-mode transformation. First, the DC grid is decomposed into the common-mode and the differential-mode networks. The equivalent models of the MMCs and DC lines in the two networks are derived, respectively. Then, based on the state matrices, a unified numerical calculation method for the fault voltages and currents at the DC side is proposed. Compared with the time-domain simulations performed on PSCAD/EMTDC, the accuracy of the proposed method is validated. Last, the system parameter analysis shows that the grounding parameters play an important role in reducing the severity of the pole-to-ground faults, whereas the coupling effects of the DC lines should be considered when calculating the DC fault currents associated with the pole-to-pole faults.

关键词： Symmetrical monopolar DC grids modular multilevel converter(MMC) pole-to-ground fault pole-to-pole faults phase-mode transformation fault current and voltage estimation

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