Speed sensorless model predictive control method for a direct-drive wind energy conversion system

Considering the problems of the internal and external disturbances of wind speed in the direct-drive wind energy conversion system based on a permanent magnet synchronous generator, a novel model predictive control based on the extended state observer method without the accurate mathematical system...

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Bibliographic Details
Published in:Measurement and control (London) 2019-11, Vol.52 (9-10), p.1394-1402
Main Authors: Li, Shengquan, Li, Juan, Wu, Hanwen, Lin, Zhongwen
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Control systems
Control theory
Disturbances
Energy conversion
Feedback control
Feedforward control
Mathematical models
On-line systems
Optimization
Parameter uncertainty
Performance enhancement
Permanent magnets
Power control
Predictive control
Speed control
State observers
State variable
Wind power
Wind speed
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Summary:Considering the problems of the internal and external disturbances of wind speed in the direct-drive wind energy conversion system based on a permanent magnet synchronous generator, a novel model predictive control based on the extended state observer method without the accurate mathematical system model is proposed in this paper. First, a model predictive control method is employed as the feedback controller, while the mathematical model of the control system can be adjusted online via the rolling optimization strategy. Second, an extended state observer is introduced to estimate the state variables and lumped disturbances, that is, the internal disturbances including nonlinear characteristic, multi-variety coupling effect, uncertainties of system parameters, and external disturbances including variations of wind speeds and uncertainties of the natural environment. Third, the effect of lumped disturbances can be attenuated by the estimated disturbance value via a feedforward channel. In addition, in order to achieve the real-time speed control performance of the permanent magnet synchronous generator, a speed sensorless algorithm based on a flux observer is proposed to solve the problem of unsuitability of mechanical speed sensor. Finally, the simulation results with several wind speed types show that the proposed sensorless model predictive control with the extended state observer strategy is an effective way to improve the performance of anti-disturbance and ability of tracking maximum wind energy of the wind power control system.
ISSN:0020-2940
2051-8730
DOI:10.1177/0020294019866855