Optimized Design and Full Operation Breaking Performance Analysis of Resistance Capacity Hybrid DC Circuit Breakers
To solve the problem of fast-breaking of fault current in flexible DC power grids,a topology structure and parameterized design method of resistance capacitance hybrid DC circuit breakers based on thyristors are proposed based on the comparison and analysis of control and protection strategies and economy of typical hybrid DC circuit breaker schemes.By introducing a resistive circuit to suppress the current-voltage rise of the circuit breaker,the functions of phase-selective opening,weak current opening,capacitor self-charging,and adaptive reclosing can be obtained,and there is no fully controlled device in the whole machine.Firstly,the control strategies and mathematical models for different modes of the proposed topology are described.Then,the device parameter design guidelines are given out,and a multi-objective jellyfish search algorithm(MOJS)is applied to find the optimum parameter combinations.Finally,by employing the PSCAD/EMTDC four-terminal DC transmission network model,the breaking performance of the proposed topology is simulated and evaluated under diverse operational conditions,and its economics and applicability have been analyzed.
DC transmission networkshybrid DC circuit breakersclamp breakingadaptive reclosing
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维普
