On the Passivity-based Control for Multilevel Inverters

Passivity‐based control of multilevel cascade inverters: High‐performance with reduced switching frequency

“…Even that chattering can be present in the closed-loop operation, as recognized in the previous remark, it is also important to notice that with the proposed control scheme this high-frequency behavior will only (eventually) appear when the state trajectories are into the ball (19). Hence, even considering this disadvantage, the objective of reducing the switching frequency is attained, as will be illustrated in the numerical evaluation presented below.…”

“…In order to introduce the contribution of this paper, it will be useful to review the result reported in [19].…”

“…However, this selection was done due to the experimental properties exhibited by this control law, which are superior to those obtained with classical control strategies, e.g. two-loop cascade PI structures, concerning fast transient response, reduced THD, ease tuning and robustness with respect to both parametric and structural uncertainty [19].…”

“…Thus, the design is divided into the following three steps: first, with the aim to retain the remarkable performance achieved with the application of PBC for power converters, it is considered as a basic element the passivity-based continuous control law reported in [19] for cascade MPC. Second, intending to obtain a reduced switching frequency, a quantized version of this high-frequency-based controller is obtained showing that it still stabilizes the closed-loop system in the sense that practical asymptotic stability [20] is achieved with respect to a ball centered on the operating point that corresponds to a zero error and whose radius is in inverse relationship with the number of voltage levels generated by the converter.…”