Overcurrent protection method and device for converter and converter

The invention discloses an overcurrent protection method and device for a converter and the converter. The method comprises: S1, monitoring the current value of the converter; S2, when the current value is greater than or equal to a preset first current threshold and the duration is greater than or equal to a preset first time threshold, triggering a converter overcurrent protection starting signal; and S3, starting converter overcurrent protection according to the converter overcurrent protection starting signal. The device comprises a current monitoring module, a calculation module and an overcurrent protection module. The converter comprises the device. The method and the device are simple in implementation, can effectively realize multiple protections, are high in reliability, can ensure safe and stable operation of a converter system, can also ensure that the system is not influenced by long-term extreme conditions, and greatly improve the stability of the system.