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Energies 2016, 9(4), 245; doi:10.3390/en9040245

Sliding-Mode Control of a Charger/Discharger DC/DC Converter for DC-Bus Regulation in Renewable Power Systems

1
Departamento de Electrónica y Telecomunicaciones, Instituto Tecnológico Metropolitano, Carrera 31 No. 54-10, Medellín, Colombia
2
Departamento de Energia Eléctrica y Automática, Universidad Nacional de Colombia, Carrera 80 No. 65-223-Facultad de Minas, Medellín, Colombia
*
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Received: 4 September 2015 / Revised: 29 January 2016 / Accepted: 7 March 2016 / Published: 29 March 2016
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Abstract

Stand-alone power systems based on renewable energy sources are used to replace generators based on fossil fuels. Those renewable power systems also require Energy Storage Devices (ESD) interfaced by a charger/discharger power converter, which consist of a bidirectional DC/DC converter, and a DC bus. This paper proposes a single sliding-mode controller (SMC) for the charger/discharger DC/DC converter to provide a stable DC bus voltage in any operation condition: charging or discharging the ESD, or even without any power exchange between the ESD and the DC bus. Due to the non-linear nature of the power converter, the SMC parameters are adapted on-line to ensure global stability in any operation condition. Such stability of the adaptive SMC is mathematically demonstrated using analytical expressions for the transversality, reachability and equivalent control conditions. Moreover, a design procedure for the adaptive SMC parameters is provided in order to ensure the dynamic response required for the correct operation of the load. Finally, simulations and experimental tests validate the proposed controller and design procedure. View Full-Text
Keywords: sliding-mode controller; adaptive controller; bidirectional DC/DC converter; underdamped response; critically damped response; energy storage device sliding-mode controller; adaptive controller; bidirectional DC/DC converter; underdamped response; critically damped response; energy storage device
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Serna-Garcés, S.I.; Gonzalez Montoya, D.; Ramos-Paja, C.A. Sliding-Mode Control of a Charger/Discharger DC/DC Converter for DC-Bus Regulation in Renewable Power Systems. Energies 2016, 9, 245.

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