Vol. 19 No. 3 (2020): Revista UIS Ingenierías
Articles

Non-linear controller for storage systems with regulated output voltage and safe current slew-rate for the battery

Carlos Andrés Ramos-Paja
Universidad Nacional de Colombia
Juan David Bastidas-Rodríguez
Universidad Nacional de Colombia
Daniel González-Montoya
Instituto Tecnológico Metropolitano

Published 2020-05-26

Keywords

  • battery,
  • capacitor,
  • buck/boost converter,
  • current slew-rate,
  • sliding-mode control

How to Cite

Ramos-Paja, C. A., Bastidas-Rodríguez, J. D., & González-Montoya, D. (2020). Non-linear controller for storage systems with regulated output voltage and safe current slew-rate for the battery. Revista UIS Ingenierías, 19(3), 117–130. https://doi.org/10.18273/revuin.v19n3-2020012

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.

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