A Novel Control Method of Zero Sequence Circulation in Parallel Inverters

Aiming at the problem of zero sequence circulation control of parallel inverters, a zero sequence circulation control method is proposed by using 111 and 000 two zero vectors in the process of re distribution of SVPWM modulation. The method can effectively reduce the zero sequence circulation, which makes the current loop control to the two inverter bridges, and the zero sequence current loop control is carried out respectively, which makes the two inverters to play the role of half of the zero sequence circulation control. This method does not increase the complexity and cost of the system, and it is not necessary to adjust the control strategy in parallel with the multi group inverters. Finally, the effectiveness and superiority of the proposed method are verified by simulation and experiment.