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Coordinated Suppression Method of fault Current for DC Grid with Novel Dissipative Resistors Topology

CSEE Journal of Power and Energy Systems 2024年第6期10卷 2371-2383页

作者： Shouqi Jiang Huanyu Zhao Guoqing Li Yechun Xin Lixin Wang Weiru Wang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

A DC grid based on half-bridge modular multilevel converters (HB-MMC) is a feasible means to realize the friendly grid connection of renewable energy. To solve problems such as the high cost and technical difficulty of DC circuit breakers (DCCB), a coordinated control method for fault current suppression of DC grid connecting wind power is proposed. The key influencing factors of DC fault current are revealed by fault characteristics analysis, and an adaptive current-limiting control method for MMC is proposed, whose parameter selection principles are designed to ensure the safe operation of equipment while achieving effective suppression of fault current. In addition, a novel configuration method of dissipative resistors with the current-limiting function is proposed, which can solve the problem of surplus power in the DC grid and reduce the current stress of converter valves. Based on this, a coordination scheme of dissipative resistors, the adaptive current-limiting control method, and DCCBs are proposed to block fault current, effectively reducing the manufacturing difficulty and cost of DCCB. Finally, a four-terminal DC grid simulation model is built based on the RTLAB OP5600 real-time digital simulation platform, and the effectiveness and feasibility of the proposed methods are verified.

关键词： Resistors Circuit faults Voltage control fault currents Reliability Inductors Wind farms

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NUMERICAL STUDY ON THE INTERACTION OF ELECTRICAL ARC-GAS FLOW NEAR CURRENT ZERO IN A SF6 SELF-BLAST INTERRUPTER

NUMERICAL STUDY ON THE INTERACTION OF ELECTRICAL ARC-GAS FLO...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： JONG-CHUL LEE HONG-KYU KIM School of Mechanical and Automotive Engineering Gangneung-Wonju National University 220711 WonjuRep.of Korea. Korea Electrotechnology Research Institute 641120 Changwon Rep.of Korea.

ISBN: (纸本)9771003651221

In SF self-blast interrupters,electrical arcs make hot gas flows driven into the expansion chamber for generating the blowing-off force during the high-current *** the fault current approaches natural current zero,this force can be used for cooling down and quenching the residual *** the interaction of electrical arc-gas flow is critical to predict the phenomena happened after current zero such as thermal breakdown *** this study,we calculated SF arc plasmas caused by fault current interruption inside a self-blast interrupter using a computational fluid dynamics(CFD) technique and investigated the thermal interruption performance with the specified arc model for the current zero phase.

关键词： current zero Sulfur Hexafluoride air flow interrupters fault currents Electricity EXPANSION CHAMBER arcs Force Zero NATIONAL EMERGENCY ALARM REPEATER currents electric current zero phase

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