Title: Direct torque control strategy applied to the grid connected wind farm based on the PMSG and controlled with variable structure approach

Authors: Youssef Errami; Abdellatif Obbadi; Mohammed Ouassaid; Mohamed Maaroufi

Addresses: Laboratory: Electronics, Instrumentation and Energy, Team: Exploitation and Processing of Renewable Energy, Department of Physics, Faculty of Science, University Chouaib Doukkali, Eljadida, Morocco ' Laboratory: Electronics, Instrumentation and Energy, Team: Exploitation and Processing of Renewable Energy, Department of Physics, Faculty of Science, University Chouaib Doukkali, Eljadida, Morocco ' Department of Electrical Engineering, Mohammadia School's of Engineers, University Mohammed V, Rabat, Morocco ' Department of Electrical Engineering, Mohammadia School's of Engineers, University Mohammed V, Rabat, Morocco

Abstract: This study proposes a direct torque control (DTC) and variable structure (VS) scheme for grid connected variable speed wind farm (VS-WF) based on the permanent magnet synchronous generators (PMSGs). The control strategy combines the DTC to achieve maximum power point tracking (MPPT) and nonlinear sliding mode (SM) control theory to sustain the DC-bus voltage and to regulate the grid-side power factor. Moreover, control strategies are developed in the sense of Lyapunov stability theorem for the VS-WF to satisfy multiple objectives. The performance of controllers is evaluated for fault conditions as well as for normal working conditions. The validity and the effectiveness of the proposed scheme are verified by simulation with Matlab/Simulink. Also, a comparison of simulation results based on the proposed algorithm and proportional-integral (PI) scheme shows that the proposed approach is superior.

Keywords: Wind farm; PMSG; MPPT; Variable-speed control; DTC; Nonlinear Control; Sliding mode approach; Electric network connection; grid fault.

DOI: 10.1504/IJPEC.2018.088265

International Journal of Power and Energy Conversion, 2018 Vol.9 No.1, pp.58 - 88

Received: 03 Dec 2015
Accepted: 03 Jul 2016

Published online: 09 Oct 2017 *

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