Method for estimating power consumption of motor in fuel cell system

A method for estimating power consumption of a motor in a fuel cell system, the method comprising steps of:

• supplying, by a controller, a terminal voltage command for each of multiple phases of the motor to an inverter;
• driving, by the controller, switching elements included in the inverter based on the terminal voltage command;
• detecting, by a current sensor, a current of each of the multiple phases of the motor depending on a change in the terminal voltage command;
• extending, by the controller, a line of a region where the current is linearly changed in a voltage-current graph showing a relationship between the terminal voltage command and the detected current, and determining, by the controller, a voltage value of a point where the line meets a voltage axis of the voltage-current graph to be an error voltage for each of the multiple phases;
• generating, by the controller, a compensation terminal voltage for each of the multiple phases of the motor by applying the error voltage to a prediction value of the terminal voltage that is derived in a preset manner during operation of the motor;
• calculating, by the controller, power consumption of the motor by using the compensation terminal voltage and a current value obtained by detecting a current that flows in each of the multiple phases of the motor;
• and
• controlling, by the controller, power output from the fuel cell system to be restricted based on the calculated power consumption of the motor.