Design-Oriented Dissipativity Robustness Enhancement for Current Control of LCL- Filtered Grid-Following VSCs

Capacitor current active damping can effectively enhance dissipativity of current control for grid-connected voltage source converters. However, the dissipative characteristic of converter output admittance can easily be jeopardized by capacitor voltage feedforward and passive filter parameter deviation. To fill this gap, a design-oriented control scheme is proposed in this paper. First, a moving-average-filter-based filter is inserted in the capacitor voltage feedforward path to achieve the dissipativity near the switching frequency. Then, the capacitor current damping coefficient is designed based on the required passive filter parameter deviation. Finally, the effectiveness of the proposed scheme is verified through the experiments.