In VSC-HVDC system for new energy island,surplus power consumption in the system during fault ride-through(FRT)is achieved by employing grouped AC energy-dissipating resistors of equal capacity.However,the presence of an excessively powered resistor group can inflict severe impacts on the system.Therefore,a novel opti-mal configuration method for energy-dissipating resistors with different capacities based on progression conversion and the switching strategy are proposed.Firstly,the operational characteristics of the grouped AC energy-dissipating resistors of equal capacity are analyzed.Subsequently,multiple groups of AC energy-dissipating resistors with vary-ing capacities,collectively equivalent to the total capacity of the VSC-HVDC system,are configured,and different combinations of the resistors are employed to obtain varying dissipating powers.Finally,a model of the integrated grid is constructed and validated using the PSCAD/EMTDC simulation platform.Simulation results demonstrate that the proposed method and switching strategy enhance the precision of resistor switching,mitigate system impacts,shorten fault recovery time,and precisely consumes surplus power during fault ride-through.
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