چكيده به لاتين
In general, the fault current in high-voltage direct current (HVDC) grids has two obvious characteristics, one is the rapid increase of the fault current, and the other is that the fault current waveform does not have the zero-crossing point. In HVDC grids, fault current level sometimes increases to the point that circuit breakers are unable to cut it. Therefore considering these problems, fault clearing is difficult. In this paper, the use of resistive type superconducting fault current limiter (RSFCL) is suggested as a solution. After determining the optimization variables and defining the economic objective function for RSFCL, and modeling it in PSCAD/EMTDC software, the optimization process in the worst fault conditions of the CIGRE B4 HVDC grid test system begins. Then, by making changes in the optimization parameters, the RSFCL performance, and its effect on the grid fault current levels have been investigated. Finally, the optimized RSFCL is placed throughout the grid, taking into account the pole-to-pole (PP) and pole-to-ground (PG) faults, and the length of YBa2Cu3O7−δ (YBCO) tape used in each position is optimized.
