Impedance Analysis of Voltage Source Converter Using Direct Power Control

The impedance analysis has been proposed and proved to be an effective way analyze the grid-connected stability of Voltage Source Converter (VSC) based energy conversion systems. Most existing analyzes are discussed on vector oriented control, while there few discussions about Direct Power Control (DPC). In this paper, modeling approach VSC using DPC is firstly analyzed, which fills gap converters provides a basis for studying corresponding grid-integration problems. Since no need PLL Park transformation, matrix built directly $\alpha \beta$ reference frame features symmetrical characteristics. can transformed into positive-sequence analyzed by SISO Nyquist criteria. weak-grid connected in article. main factors affecting system stability, including grid control parameters, considered analysis. effectiveness method demonstrated simulations carried out Matlab/Simulink Simscape Systems as well hardware-in-loop system.