Offshore wind power flexible direct output system bus protection method and system and storage medium

The invention provides an offshore wind power flexible direct output system bus protection method and system and a storage medium, and the method comprises the steps: obtaining a bus voltage variable quantity, and obtaining a plurality of branch voltages and currents of a bus when the bus voltage variable quantity meets a starting criterion of bus protection; respectively sampling the voltages and currents of the plurality of branches by using a data window with a preset size, and obtaining a resistance model error, a capacitance model error and a resistance dispersion of the equivalent model corresponding to the internal and external faults of the bus region according to the obtained voltages and currents; according to the resistance model error, the capacitance model error and the resistance dispersion, establishing a fault criterion, and according to the fault criterion, when a fault area is an internal fault, sending a protection signal to protect a bus; according to the invention, more effective protecti