Modelling, analysis and virtual parallel resistor damping control of VSC‐based DC grid using master–slave control mode

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Abstract
This study presents a generic linearised modelling method and a virtual parallel resistor damping control for a voltage source converter‐based high‐voltage direct current (HVDC) system including a direct current (DC) grid. The generic modelling method is composed of DC network's equivalent node‐admittance matrix and the Thévenin equivalent matrix of all converters. A simplified two‐terminal HVDC system is used to identify the key factors influencing the stability of the DC grid easily. Those key factors are proved by two methods, namely, root locus and participation factors analysis. The parameters of the virtual parallel resistor damping control are designed using the simplified HVDC system. The performance of the proposed damping control is studied employing the linearised model of the DC grid. Time simulations such as instability suppressing, power‐controlled station N  −   1 fault, and DC system faults are carried out to validate the effectiveness of the damping control.
Funding Information
  • Natural Science Foundation of Hunan Province (14JJ1025)

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