DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speed wind turbine

doi:10.1007/s11708-014-0330-x

Front. Energy

2014, Vol. 8

Issue (3) : 345-354 https://doi.org/10.1007/s11708-014-0330-x

RESEARCH ARTICLE

DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speed wind turbine

Youcef BEKAKRA^1,^*(

),Djilani BEN ATTOUS²

1. Department of Electrical Engineering, University of Biskra, Biskra 07000, Algeria
2. University of El Oued, El Oued 39000, Algeria

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Abstract

This paper proposes an indirect power control of doubly fed induction generator (DFIG) with the rotor connected to the electric grid through a back-to-back pulse width modulation (PWM) converter for variable speed wind power generation. Appropriate state space model of the DFIG is deduced. An original control strategy based on a variable structure control theory, also called sliding mode control, is applied to achieve the control of the active and reactive power exchanged between the stator of the DFIG and the grid. A proportional-integral-(PI) controller is used to keep the DC-link voltage constant for a back-to-back PWM converter. Simulations are conducted for validation of the digital controller operation using Matlab/Simulink software.

Keywords doubly fed induction generator (DFIG) wind turbine back-to-back pulse width modulation (PWM) DC-link voltage sliding mode control

Corresponding Author(s): Youcef BEKAKRA

Issue Date: 09 September 2014

Cite this article:

Youcef BEKAKRA,Djilani BEN ATTOUS. DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speed wind turbine[J]. Front. Energy, 2014, 8(3): 345-354.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-014-0330-x
https://academic.hep.com.cn/fie/EN/Y2014/V8/I3/345

Fig.1 Aerodynamic power coefficient variation Cpagainst tip speed ratio λ and pitch angle β

Fig.2 Main circuit topology of a back-to-back PWM converter for DFIG

Fig.3 GSC configuration

Fig.4 Vector control block diagram of grid-side PWM converter

Fig.5 Block diagram of SMC applied in RSC and PI controller applied in GSC of the DFIG

Fig.6 Wind speed profiles

Fig.7 Turbine rotor speed

Fig.8 Power coefficient Cp variation

Fig.9 Stator active power injected into the grid

Fig.10 Stator reactive power

Fig.11 Stator current versus the time of the DFIG and its zoom

(a) Stator current; (b) its zoom

Fig.12 Spectrum of phase stator current harmonics

Fig.13 DC-link voltage and its zoom in startup

(a) DC-link voltage; (b) its zoom in start up

Tab.1 Notations

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