The three-dimensional space vector pulse width modulation (3D-SVPWM) control strategy for suppressing common-mode voltage of three-phase four-bridge inverter is analyzed. Because the common mode voltage generated from the high power convertor system is easy to damage the load such as motor

and affect the power quality of the power supply

an optimized 3D-SVPWM control strategy is proposed. Firstly

the topology of three-phase four-bridge inverter is described

and the reason of generating the common mode voltage is given. Then

according to the traditional 3D-SVPWM control strategy

two converse non-zero vectors near the reference vector are selected to replace the zero vectors. Finally

the modeling and simulation are carried out through MATLAB/Simulink and the results show that the improved control strategy is not affected by the changes of load balance status. Moreover

without changing the DC voltage utilization

the common-mode voltage can be effectively decreased to realize active suppression.