Title: Fractional order PID controller for DC link voltage regulation in hybrid system including wind turbine- and battery packs-experimental validation

Authors: Boualam Benlahbib; Farid Bouchafaa; Noureddine Bouarroudj; Saad Mekhilef

Addresses: Laboratoire d'Instrumentation, Faculté d'Electronique et d'Informatique USTHB, Algiers, Algeria; Unité de Recherche Appliquée en Energies Renouvelables, URAER, Centre de Développement des Energies Renouvelables, CDER, 47133, Ghardaïa, Algeria; Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia ' Laboratoire d'Instrumentation, Faculté d'Electronique et d'Informatique USTHB, Algiers, Algeria ' Unité de Recherche Appliquée en Energies Renouvelables, URAER, Centre de Développement des Energies Renouvelables, CDER, 47133, Ghardaïa, Algeria ' Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract: This paper presents a fractional order PID (FOPID) to control the operation of a stand-alone hybrid energy system with a wind turbine based on permanent magnet synchronous generator (PMSG) and a battery bank. In order to maintain the DC-link voltage at its reference value, regardless the variation in wind speed and load impedance a FOPID controller using a DC-DC buck-boost converter fed by a lead acid battery bank is used. The line to line AC output voltage regulation based on PID controller to supply RL load with constant amplitude and frequency has been achieved. The proposed FOPID controller is examined through simulation using MATLAB-simulink and experimentally via an experimental test bench under step change variation of wind speed and load impedance. The obtained simulation and experimental results using FOPID controller show better performances than the conventional PID regulator in terms of less settling time and lower overshoot in the transient state as well as a minimum steady state oscillation.

Keywords: wind energy conversion system; WECS; fractional order PID; energy storage system; ESS; permanent magnet synchronous generator; PMSG; DC-link control strategy; battery packs.

DOI: 10.1504/IJPELEC.2019.099346

International Journal of Power Electronics, 2019 Vol.10 No.3, pp.289 - 313

Received: 17 Dec 2017
Accepted: 21 Feb 2018
Published online: 29 Apr 2019 *

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