In the simultaneously rotary d-q coordinates

the coupling of active and reactive currents in the mathematical model of VSC-HVDC brings about difficulty to control.In order to solve this problem

this paper presented a control strategy of current decoupling using internal mold principle based on the model of VSC-HVDC

and provided theoretical analysis and a parameter setting algorithm.Moreover

the proposed strategy was simulated by MATLAB.The results verifies that the method can implement decoupling control of current

and is simple because only time constant of the filter needs to be adjusted.This method shows high robustness and enhanced anti-interference capacity under variation of system characteristics.