The dual-passage excitation control strategy for AC excited generator（ACEG） based on dynamic synchronous reference frame is analyzed. The dual pulse width modulation（PWM） control AC-DC-AC voltage source converter with excellent input and output characteristics is proposed as the excitation power supply for ACEG. An ACEG experiment platform based on dual PWM converter is established by using high-speed digital signal processor TMS320F2812 and the system performance is assessed through the experiment. The independent regulation of active power， reactive power and rotating speed can be realized and the ACEG has good dynamic response ability. As the ideal excitation power supply for ACEG， the dual PWM converter has many advantages such as bidirectional power flow， low harmonics input and output currents， excellent dynamic response and adjustable power factor.