Positive-Sequence Voltage Control, Full Negative-Sequence Cancellation, and Current Limitation for Static Compensators

This article presents a control scheme in the stationary reference frame for static synchronous compensators (STATCOMs) that provide three features: 1) regulation of positive-sequence voltage to nominal value; 2) full cancellation negative-sequence voltage; and 3) peak limitation injected currents. These features can help improve performance these devices under perturbed grid conditions, including low, high, unbalanced voltages. Also, current limiter guarantees both safe operation converter priority-based achievement targets, which is interest during severe perturbations like dips. Experimental results, implementation details, closed-loop analysis are presented validate capabilities demonstrate feasibility power quality improvement.