Abstract
A stable and reliable DC-link voltage is considered as key factors for successful power transmission in high voltage direct current (HVDC) grids. In this context, voltage source converter (VSC) control and stability analysis for regulating the DC-link voltage are presented in this paper. Vector control is introduced, and three-phase currents and voltages are presented in the synchronous reference frame in order to realize an independent active and reactive power control. Optimal proportional-integral (PI) controller is designed and Transfer functions are derived for inner and outer control loop. Furthermore, modulus optimum and symmetrical optimum methods are utilized for tuning the gain parameters of current and voltage controllers in order to achieve satisfied system performance. The gain parameters for DC-link voltage based on symmetrical optimum method are identified for different grid impedance values. A brief study of the effect of the gain parameters on the output DC-voltage response is discussed using a manual tuning method. Simulations using MATLAB/Simulink are carried out to verify the stability analysis of the DC-link voltage control.
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