PSI- Issue 9

Mohammed Ezzahi et al. / Procedia Structural Integrity 9 (2018) 221–228 Author name / Structural Integrity Procedia 00 (2018) 000–000

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presented as a strategy for induction motor speed’s adjustment feeding by variable frequency converter Blaschke (1972). This strategy, which is a classical one, still have more interest by developing new control algorithms and by using the Sensorless WPS. Making the control of the active and the reactive powers easy and reliable. So, the FOC models still giving good performances compared to the other methods of control. From a point of view of structural integrity, the mastering of the controls of DFIG machines and the use of Sensorless commands give rise to an enhanced running of the wind power system and optimize their maintenance. 3. Structural integrity of Wind Power systems (WPS): In order to assess the structural integrity of WPS, we have to deal with both the mechanical and the electrical parts. The figure 1 shows the different parts of a WPS:

Fig. 1. WPS elements The failure of the electrical parts is one of the most important in wind power system. Thus, we need to optimize the controls of the DFIG machine and adopt a Sensorless control strategy of the DFIG machine in order to guarantee a less maintenance operation and run the WPs for a long time, figure 2.

Steady‐state model

Slip calculation

Torque

Open loop estimators

Flow induced emf

Artificial Intelligence

MRAS

Sensorless systems

Transitional model

Complete order

Conventional

Reduced Order

Observers

Extended Kalman

Kalman

HF Injection

Appearance of the machine

Harmonics notches

Fig. 2. The differents DFIG sensorless systems