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This paper investigates the effects of the DC link voltage of a voltage source converter (VSC)on the performance oftwo current control strategies of the VSCsfrom point of views: capability of tracking the references signals with a zero steady-state error and imposing less transients during the step changes in the references signals of the controllers. Two conventional and multivariable proportional-integral (PI) based dqcurrent controllerstrategy has been represented. Then based on the considering the worst step changes in the references signals of the VSC while the DC link voltage (Vdc) is varying, a specified range has been obtained for theVdc.It has been depicted thatthe multivariable control strategy has less transient and more decoupling capability between d and q axis components of the current during the step changes which have been occurred in the various DC link voltage of the VSC. Alsofor tracking the reference signals,Vdc of the inverter must be in a particular range.Otherwise tracking the reference signals verifies that the axes are not fully decoupled or in some cases the system would be unstable.

DC Link Voltage Effects on the Performance of the Two Current Control Strategies of Voltage Source Converters