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Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids

Author

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  • Carlos Andrés Ramos-Paja

    (Facultad de Minas, Universidad Nacional de Colombia, Medellín 050040, Colombia
    Current address: Carrera 80 No 65-223, Block M8—Office 206-113, Medellín 050040, Colombia)

  • Juan David Bastidas-Rodríguez

    (Escuela de Ingenierías Eléctrica, Electrónica y de Telecomunicaciones, Universidad Industrial de Santander, Bucaramanga 680002, Colombia)

  • Daniel González

    (Departamento de Electrónica y Telecomunicaciones, Instituto Tecnologico Metropolitano, Medellín 050034, Colombia)

  • Santiago Acevedo

    (Departamento de Electrónica y Telecomunicaciones, Instituto Tecnologico Metropolitano, Medellín 050034, Colombia)

  • Julián Peláez-Restrepo

    (Departamento de Electrónica y Telecomunicaciones, Instituto Tecnologico Metropolitano, Medellín 050034, Colombia)

Abstract

In DC and hybrid microgrids (MG), the DC-bus regulation using Energy Storage Devices (ESD) is important for the stable operation of both the generators and loads. There are multiple commercial voltage levels for both ESD and DC-bus; therefore, the ESD voltage may be higher, equal or lower than the DC-bus voltage depending on the application. Moreover, most of the ESD converter controllers are linear-based, hence they ensure stability in a limited operation range. This paper proposes a system to regulate the DC-bus voltage of an MG accounting for any voltage relation between the ESD and the DC-bus voltage. The proposed system is formed by an ESD connected to a DC-bus through a bidirectional Buck–Boost converter, which is regulated by a Sliding-Mode Controller (SMC) to ensure the system stability in the entire operation range. The SMC drives the Buck–Boost charger–discharger to regulate the DC-bus voltage, at the desired reference value, by charging or discharging the ESD. This paper also provides detailed procedures to design the parameters of both the SMC and the charger–dischager. Finally, simulation and experimental results validate the proposed solution and illustrate its performance.

Suggested Citation

  • Carlos Andrés Ramos-Paja & Juan David Bastidas-Rodríguez & Daniel González & Santiago Acevedo & Julián Peláez-Restrepo, 2017. "Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids," Energies, MDPI, vol. 10(11), pages 1-26, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1847-:d:118523
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    References listed on IDEAS

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