Non-linear controller for storage systems with regulated outputvoltage and safecurrent slew-rate for the battery

Abstract

This paper proposes a non-linear control structure for a hybrid energy storage system with a series architecture, which regulates the voltage of a DC bus (output voltage) and ensures that the battery current fulfills the current slew-rate restriction. The proposed solution has two stages, in the first one, the battery is connected to a buck/boost converter that feeds an auxiliary capacitor. In the second stage, the auxiliary capacitor is connected to a DC bus through a second buck/boost converter. Both converters are regulated using cascaded control systems, where the inner loops are slidingmode controllers of the inductors’ current, and the outer loops in the first and second converter are designed to limit the slew-rate of the battery current and to regulate the dc bus voltage, respectively. The paper provides the design procedure for the controllers and validates its performance with simulation results for the power system operating in charging, discharging and stand-by modes.

Formulación de un controlador H ∞ con incertidumbre no estructurada para un convertidor DC - DC elevador (boost)

“…Los convertidores DC-DC son dispositivos electrónicos usados para aumentar la diferencia de potencial eléctrico de las fuentes DC [1], en consecuencia, estos dispositivos son comúnmente usados en aplicaciones industriales tales como energías renovables, autos eléctricos, generación distribuida (microgrids) [2] [3].…”