Aiming at the problem of low utilization of DC voltage in conventional sixphase SPWM algorithm, a sixphase carrier PWM algorithm based on double zerosequence signal injection was studied. The algorithm improved sixphase inverter control performance by injecting a certain double zerosequence component into a sine wave. The change range of the double zerosequence component of the algorithm and the principle of raising the DC voltage utilization ratio were analyzed. Three double zerosequence injection methods with different output characteristics were given. Through the simulation of the mean zerosequence injection method, it was seen that the algorithm could increase the utilization of DC voltage, and the system operating characteristics was improved, so that the effectiveness and feasibility of the PWM algorithm were verified.