Asymptotic rejection of sinusoidal disturbances based voltage balance control in back-to-back power converters
|Umbría Jiménez, Francisco
Gordillo Álvarez, Francisco
Salas Gómez, Francisco
Aracil Santonja, Javier
|Universidad de Sevilla. Departamento de Ingeniería de Sistemas y Automática
|This paper addresses the imbalance problem of the dc-link capacitor voltages in the three-level diode-clamped back-to-back power converter. In order to cope with it, a mathematical analysis of the capacitor voltage difference ...
This paper addresses the imbalance problem of the dc-link capacitor voltages in the three-level diode-clamped back-to-back power converter. In order to cope with it, a mathematical analysis of the capacitor voltage difference dynamics, based on a continuous model of the converter, is ﬁrst carried out. It leads to an approximated model which contains explicitly several sinusoidal functions of time. In view of this result, the voltage imbalance phenomenon can be addressed as an output regulation problem, considering the sinusoidal functions as exogenous disturbances. Thus, a novel approach to deal with the mentioned problem in the back- to-back converter is presented. Then, the particular features of the disturbances are used to design several controllers. They all follow an asymptotic disturbance rejection approach. In this way, the estimations of the disturbances are used to apply a control law that cancels them while regulating the capacitor voltage balance as well. Finally, the performance of the proposed control laws is evaluated, presenting the simulation results obtained when the different controllers are implemented.
|Ministerio de Ciencia e Innovación (MICIN). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)