Deadbeat Voltage Control for a Grid-Forming Power Converter

Grid-forming power converters are controlled as voltage sources to regulate the grid voltage and frequency. In these converters the capacitor voltage of the output LC filter is normally controlled by means of classical control structures, virtual impedance emulation, or in many cases, by means of multi-loop approaches that include inner current control loops. Nevertheless, in high power converters, the computational delay can compromise the dynamic response of such controllers. To improve the transient response of grid-forming converters, in this paper we propose an alternative based on a deadbeat control strategy of the capacitor voltage. The proposed strategy does not require knowledge of the grid impedance, can actively damp the filter resonance and is robust to parameter variations. Moreover, it offers excellent transient response and accurate tracking of the active and reactive power.