Dissipativity-based control for STATCOM

This paper describes a dissipativity-based approach for the dynamic control of FACTS devices based on voltage source inverters (VSI), such as STATCOM and UPFC. The main goal of the approach is to achieve the AC current and DC voltage regulation by shaping the energy of the closed-loop system, similarly to Lyapunov techniques. The proposed nonlinear control results in globally stable behaviour and it allows a reduction of DC capacitor storage capability, since the bandwidth of DC voltage regulation can be made comparable to that of AC currents without requiring the conventional decoupling between the DC-link voltage and AC current loops. Finally, an adaptive procedure is presented, which allows estimation of constant-but unknown-parameters and precise reference tracking. Simulation results, obtained using an ATP model of 24-pulse NPC inverters, indicate effectiveness and validity of the proposed method.