A current source converter(CSC)based multi-port converter system is researched and its application in microgrid cluster is presented. Aiming at problems of motor damage

electro-magnetic interference

communication failure and maloperation of the protection caused by large common-mode voltage(CMV)

this paper proposes an enhanced comprehensive space vector modulation strategy. Firstly

redundant switching statuses of zero vectors are properly selected to suppress corresponding CMV. Then

the effect of different sequences of vector on CMV is analyzed and an optimized sequence is presented to reduce the peak CMV induced by random sequences. Finally

a simulation model of multi-port CSC utilized in microgrid cluster is established in MATLAB/Simulink

and results verify the effectiveness of the proposed modulation strategy and CMV suppression.