Patent ID: 11916504
Assignee: BYD COMPANY LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 12:
13. The energy conversion device according to claim 10, wherein
the external power supply is a power battery and a direct current (DC) power supply device; the power battery is connected with the reversible PWM rectifier; the external DC charging and discharging port is connected with at least one neutral line led out from the motor coil; and the DC power supply device is connected with the external DC charging and discharging port;
the at least two sets of heating circuits comprise the power battery, the reversible PWM rectifier, and the winding units in the motor coil, and a charging circuit comprises the DC power supply device, the motor coil, the reversible PWM rectifier, and the power battery; or the external power supply is a power battery, the power battery is connected with the reversible PWM rectifier, the external DC charging and discharging port is connected with the at least one neutral line led out from the motor coil, and the external DC charging and discharging port is connected with a DC electric device;
the at least two sets of heating circuits comprise the power battery, the reversible PWM rectifier, and the winding units in the motor coil; and a discharging circuit comprises the power battery, the reversible PWM rectifier, the motor coil, and the DC electric device; and
the controller is further configured to:
acquire the target heating power that needs to be generated by the motor coil and a target charging power or a target discharging power of the power battery;
acquire a target charging current or a target discharging current of each set of the winding unit according to the target charging power or the target discharging power, and acquire a first heating power generated by each set of the winding unit according to the target charging current or the target discharging current;
acquire a second heating power generated by each set of the winding unit according to the target heating power and the first heating power generated by each set of winding unit;
obtain the target resultant current vector of each set of the winding unit according to the second heating power, and acquire the target direct axis current of each set of the winding unit on the direct axis of the synchronous rotating reference frame and acquire the target quadrature axis current of each set of the winding unit on the quadrature axis of the synchronous rotating reference frame according to the target resultant current vector;
acquire the actual direct axis current, the actual quadrature axis current, and a zero-axis current of each set of the winding unit respectively on the direct axis and the quadrature axis of the synchronous rotating reference frame according to the sampling current value of each set of the winding unit, and perform closed-loop control according to the target quadrature axis current, the target direct axis current, the actual quadrature axis current, and the actual direct axis current to acquire a first duty cycle of each phase bridge arm of the reversible PWM rectifier connected with each set of the winding unit;
perform closed-loop control according to the target charging current or the target discharging current and the zero-axis current to acquire a duty cycle adjustment value of the bridge arm of the reversible PWM rectifier connected with each set of the winding unit; and
acquire the duty cycle of each phase bridge arm of the reversible PWM rectifier connected with each set of the winding unit according to the first duty cycle and the duty cycle adjustment value.