The input-series-output-parallel（ISOP）connected DC solid state transformer（DCSST）with dual active bridge（DAB）DC-DC converter as the basic power module is very suitable for high voltage and high power applications such as interconnection of DC grid or large-scale new energy convergence.This paper proposes an inversedroop control scheme with voltage feed-forward to solve the main problem of the traditional inverse-droop control scheme that cannot take into account the input voltage/output current sharing and the output voltage regulating performance.By introducing input voltage mean feed-forward

the input voltage and output voltage of DCSST is decoupled

which makes DCSST have better voltage stabilization performance while realizing voltage/current sharing.Finally

an ISOP connected DCSST consisting of three DAB cells is built in PSCAD/EMTDC to verify the correctness and effectiveness of proposed scheme.Experimental results show that the proposed control scheme can not only balance the transferring power of each cell in DCSST

but also have excellent voltage stabilization performance.