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High-Order Sliding Mode Control of DFIG-Based Wind Turbines

  • Mohamed BenbouzidEmail author
Chapter
Part of the Advances in Industrial Control book series (AIC)

Abstract

Actually, variable speed wind turbines are continuously increasing their market share, since it is possible to track the changes in wind speed by adapting shaft speed, and thus maintaining optimal power generation. The more variable speed wind turbines are investigated, the more it becomes obvious that their behavior is significantly affected by the used control strategy. Typically, they use aerodynamic controls in combination with power electronics to regulate torque, speed, and power. The aerodynamic control systems, usually variable-pitch blades or trailing-edge devices, are expensive and complex, especially for larger turbines. This situation provides a motivation to consider alternative control approaches. This chapter deals, therefore, with high-order sliding mode control of doubly-fed induction generator-based wind turbines. This kind of control strategy presents attractive features such as chattering-free behavior (no extra mechanical stress), finite reaching time, and robustness with respect to external disturbances (grid faults) and unmodeled dynamics (generator and turbine). High-sliding mode control appropriateness will be highlighted in terms of sensorless control and enhanced fault-ride through capabilities. Simulations using the NREL FAST code will be shown for validation purposes.

Keywords

Wind turbine Doubly-fed induction generator High-order sliding modes High-gain observer Control Sensorless control 

Nomenclature

WT

Wind turbine

DFIG

Doubly-fed induction generator

HOSM

High-order sliding mode

MPPT

Maximum power point tracking

FRT

Fault ride-through

LVRT

Low-voltage ride-through

v

Wind speed (m/sec)

ρ

Air density (kg/m3)

R

Rotor radius (m)

Pa

Aerodynamic power (W)

Ta

Aerodynamic torque (Nm)

λ

Tip speed ratio (TSR)

Cp(λ)

Power coefficient

β

Pitch angle

ωmr

WT rotor speed (rad/sec)

ωmg

Generator speed (rad/sec)

Tg

Generator electromagnetic torque (Nm)

Jt

Turbine total inertia (kg m2)

Kt

Turbine total external damping (Nm/rad sec)

d, q

Synchronous reference frame index

s, (r)

Stator (rotor) index

V (I)

Voltage (Current)

P (Q)

Active (Reactive) power

ϕ

Flux

Tem

Electromagnetic torque

R

Resistance

L (M)

Inductance (Mutual inductance)

σ

Leakage coefficient

ωr (ωs)

Angular speed (Synchronous speed)

s

Slip

p

Pole pair number

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.EA 4325 LBMSUniversity of BrestBrest Cedex 03France

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