Power system management method and device and vehicle

The embodiment of the invention discloses a management method for a power system. The management method comprises the steps that the current state of a vehicle is obtained; determining that the vehicle is in a fault state; acquiring a current voltage value of the GCU, and comparing the current voltage value with a preset voltage value; and determining whether the vehicle is in a first fault state or a second fault state according to a comparison result, and executing a corresponding management scheme, at least one management scheme including obtaining the maximum output power of the generator and limiting the output power of the generator according to the maximum output power, so as to control the vehicle to enter a limp-up mode. According to the management method of the power system in the embodiment of the invention, the probability of further loss caused by vehicle faults can be reduced, and the personal safety of people in the vehicle can be guaranteed. Meanwhile, the driving state of the vehicle can be c