Abstract:Firstly, the various existing circuit breakers are compared, and on this basis, a new topology for current-limiting HVDC circuit breaker is proposed in this paper. Insulation gate bipolar transistor(IGBT) is used in this topology as main power switching devices. This topology has two operating modes: fault current limiting and circuit breaking. The topology has the advantages of lower power loss, large quantities of turning off current, and high voltage level. The branches of this topology has the features of modularity, which can be flexibly configured to regulate the working current and current limiting effect. Therefore, the directly parallel connection of the IGBTs can be avoided or reduced. Finally, the topology is modeled in PSCAD/EMTDC, the simulation results show that the topology has good fault current limiting and circuit breaking performance. Compared with existing scheme, the peak current and its rising-rate are reduced. The results show the reliability of the novel theory and feasibility of proposed topology.
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