A parameter identification method for a wind turbine generator, the method comprising: closing a circuit breaker between a rectifier side of a converter and the generator to connect the generator to the converter; controlling the generator to no-load start and shut down by adjusting a blade angle; acquiring operating data of the generator in a duration from no-load start to shutdown of the generator, the operating data comprising a terminal voltage, a terminal current and a rotational speed of the generator; and determining parameters of the generator based on the acquired operating data of the generator, comprising: determining, based on the terminal voltage of the generator collected in real time, a real-time rotor position angle θ operation when the generator is operating and a rotor position angle θ shutdown when the generator is shut down, wherein after controlling the generator to shut down by adjusting the blade angle, the parameter identification method further comprises: controlling a switching tube on the rectifier side of the converter to output pulse voltage signals to generator windings; collecting three-phase terminal voltages and three-phase stator currents output by the generator based on excitation of the pulse voltage signals; determining a d-axis voltage, a q-axis voltage, a d-axis current and a q-axis current of the generator in a target sampling period, based on the three-phase terminal voltages, the three-phase stator currents, and the rotor position angle θ shutdown when the generator is shut down; and determining a d-axis inductance and a q-axis inductance of the generator, based on the d-axis voltage, the q-axis voltage, the d-axis current and the q-axis current of the generator in the target sampling period, and a preset sampling period. closing a circuit breaker between a rectifier side of a converter and the generator to connect the generator to the converter; controlling the generator to no-load start and shut down by adjusting a blade angle; acquiring operating data of the generator in a duration from no-load start to shutdown of the generator, the operating data comprising a terminal voltage, a terminal current and a rotational speed of the generator; and determining parameters of the generator based on the acquired operating data of the generator, comprising: determining, based on the terminal voltage of the generator collected in real time, a real-time rotor position angle θ operation when the generator is operating and a rotor position angle θ shutdown when the generator is shut down, wherein after controlling the generator to shut down by adjusting the blade angle, the parameter identification method further comprises: controlling a switching tube on the rectifier side of the converter to output pulse voltage signals to generator windings; collecting three-phase terminal voltages and three-phase stator currents output by the generator based on excitation of the pulse voltage signals; determining a d-axis voltage, a q-axis voltage, a d-axis current and a q-axis current of the generator in a target sampling period, based on the three-phase terminal voltages, the three-phase stator currents, and the rotor position angle θ shutdown when the generator is shut down; and determining a d-axis inductance and a q-axis inductance of the generator, based on the d-axis voltage, the q-axis voltage, the d-axis current and the q-axis current of the generator in the target sampling period, and a preset sampling period. controlling a switching tube on the rectifier side of the converter to output pulse voltage signals to generator windings; collecting three-phase terminal voltages and three-phase stator currents output by the generator based on excitation of the pulse voltage signals; determining a d-axis voltage, a q-axis voltage, a d-axis current and a q-axis current of the generator in a target sampling period, based on the three-phase terminal voltages, the three-phase stator currents, and the rotor position angle θ shutdown when the generator is shut down; and determining a d-axis inductance and a q-axis inductance of the generator, based on the d-axis voltage, the q-axis voltage, the d-axis current and the q-axis current of the generator in the target sampling period, and a preset sampling period.