Method for controlling energy flow of current transformer of composite power supply system and current transformer

The invention discloses a method for controlling the energy flow of a current transformer of a composite power supply system and the current transformer. The method comprises the following steps: detecting a working condition of a load motor; when the whole load motor is at a traction working condition, controlling the current transformer to supply the power of one or more power supply systems in the composite power supply system to the motor; when the whole load motor is at a braking working condition, controlling the current transformer to supply the power generated when the motor brakes to the one or more power supply systems in the composite power supply system; when a part of load motor is at the traction working condition and the other part of load motor is at the braking working condition, controlling the current transformer to supply the power generated when the motor is at the braking working condition to the motor which is at the traction working condition, excepting for supplying the power of the one or more power supply systems in the composite power supply system to the motor. According to the method and the current transformer disclosed by the invention, the problem that an existing current transformer is single in flowing direction and single in power supply form can be solved.