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Large Signal Stabilization of Hybrid AC/DC Micro-Grids Using Nonlinear Robust Controller

Author

Listed:
  • Reza Pejmanfar

    (Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran)

  • Mahmoud Reza Haghifam

    (Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 14115-111, Iran)

  • Soodabeh Soleymani

    (Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran)

  • Babak Tavassoli

    (Department of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran 16317-14191, Iran)

Abstract

This paper presents a robust nonlinear integrated controller to improve stability of hybrid AC/DC micro-grids under islanding mode. The proposed controller includes two independent controllers where each one is responsible to control one part of the system. First controller will improve the stability of input DC/DC converter. Using this controller, the voltage of DC bus is fully stabilized such that when a large disturbance occurs, its voltage will become constant without any significant dynamic. The necessity of DC bus regulation which has not been considered in previous studies, is imminent as it not only improves voltage stability of the micro-grid but also protects consumers which are directly connected to the DC bus, against voltage variations. Frequency stability of the micro-grid is provided by the second proposed controller which is applied to output DC/AC converter of the micro-grid. Adaptive method is used to make the controllers proposed in this paper, robust. Duty cycle of converters switches are adjusted such that voltage and frequency of the micro-grid are set on the desired value in minimum possible time under transient disturbances and uncertainty of the loads as well as micro-sources characteristics.

Suggested Citation

  • Reza Pejmanfar & Mahmoud Reza Haghifam & Soodabeh Soleymani & Babak Tavassoli, 2017. "Large Signal Stabilization of Hybrid AC/DC Micro-Grids Using Nonlinear Robust Controller," Energies, MDPI, vol. 10(12), pages 1-25, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:1985-:d:121211
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    References listed on IDEAS

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    1. Sergio Ignacio Serna-Garcés & Daniel Gonzalez Montoya & Carlos Andres Ramos-Paja, 2016. "Sliding-Mode Control of a Charger/Discharger DC/DC Converter for DC-Bus Regulation in Renewable Power Systems," Energies, MDPI, vol. 9(4), pages 1-27, March.
    2. Unamuno, Eneko & Barrena, Jon Andoni, 2015. "Hybrid ac/dc microgrids—Part I: Review and classification of topologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 52(C), pages 1251-1259.
    3. Mohammadmehdi Seyedmahmoudian & Saad Mekhilef & Rasoul Rahmani & Rubiyah Yusof & Ehsan Taslimi Renani, 2013. "Analytical Modeling of Partially Shaded Photovoltaic Systems," Energies, MDPI, vol. 6(1), pages 1-17, January.
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