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A Hybrid Fault-Tolerant Strategy for Severe Sensor Failure Scenarios in Late-Stage Offshore DFIG-WT

Author

Listed:
  • Wei Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing 102206, China)

  • Gengyin Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing 102206, China)

  • Kai Ni

    (Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK)

  • Yihua Hu

    (Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK)

  • Xinhua Li

    (Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK)

Abstract

As the phase current sensors and rotor speed/position sensor are prone to fail in the late stage of an offshore doubly-fed induction generator based wind turbine (DFIG-WT), this paper investigates a hybrid fault-tolerant strategy for a severe sensor failure scenario. The phase current sensors in the back-to-back (BTB) converter and the speed/position sensor are in the faulty states simultaneously. Based on the 7th-order doubly-fed induction generator (DFIG) dynamic state space model, the extended Kalman filter (EKF) algorithm is applied for rotor speed and position estimation. In addition, good robustness of this sensorless control algorithm to system uncertainties and measurement disturbances is presented. Besides, a single DC-link current sensor based phase current reconstruction scheme is utilized for deriving the phase current information according to the switching states. A duty ratio adjustment strategy is proposed to avoid missing the sampling points in a switching period, which is simple to implement. Furthermore, the additional active time of the targeted nonzero switching states is complemented so that the reference voltage vector remains in the same position as that before duty ratio adjustment. The validity of the proposed hybrid fault-tolerant sensorless control strategy is demonstrated by simulation results in Matlab/Simulink2017a by considering harsh operating environments.

Suggested Citation

  • Wei Li & Gengyin Li & Kai Ni & Yihua Hu & Xinhua Li, 2017. "A Hybrid Fault-Tolerant Strategy for Severe Sensor Failure Scenarios in Late-Stage Offshore DFIG-WT," Energies, MDPI, vol. 11(1), pages 1-23, December.
    • Handle: RePEc:gam:jeners:v:11:y:2017:i:1:p:21-:d:124026
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    References listed on IDEAS

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    1. Alsofyani, Ibrahim M. & Idris, N.R.N., 2013. "A review on sensorless techniques for sustainable reliablity and efficient variable frequency drives of induction motors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 24(C), pages 111-121.
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