Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

Sergio Ignacio Serna-Garcés, Daniel González Montoya and Carlos Andrés Ramos-Paja
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Sergio Ignacio Serna-Garcés: Departamento de Electrónica y Telecomunicaciones, Instituto Tecnológico Metropolitano, Carrera 31 No. 54-10, Medellín 050013, Colombia
Daniel González Montoya: Departamento de Electrónica y Telecomunicaciones, Instituto Tecnológico Metropolitano, Carrera 31 No. 54-10, Medellín 050013, Colombia
Carlos Andrés Ramos-Paja: Departamento de Energía Eléctrica y Automática, Universidad Nacional de Colombia, Carrera 80 No. 65-223, Facultad de Minas, Medellín 050041, Colombia

Energies, 2018, vol. 11, issue 3, 1-30

Abstract: Stand-alone power systems based on renewable energy sources are widely used for energy generation in remote locations and for distributed generation in urban environments. The DC bus is an essential component of these systems since it enables power transmission between the sources, loads and batteries. The batteries are interfaced with the bus using a charger/discharger DC/DC converter, which is controlled to regulate the DC bus voltage under any operating conditions. This is an important task because unsafe over-voltages and under-voltages in the bus could damage the sources, loads and power converters. This paper proposes a sliding-mode controller for a charger/discharger DC/DC converter with improved disturbance rejection to provide a tight bus voltage regulation for safe operation. The main novelty of this solution is the inclusion of the bus current in the sliding surface, which accelerates the controller response. Moreover, a formal proof of the system global stability is provided, and a detailed process is developed to calculate the controller and implementation parameters. Finally, the proposed solution is validated through simulations and experiments.

Keywords: battery charger/discharger; bidirectional converter; sliding-mode controller; DC bus (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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