Experimental Analysis for enhancement of unbalanced standalone Wind Energy Conversion System

In this paper, the control of an autonomous doubly fed induction generator (DFIG) based Wind Energy Conversion System (WECS) with unbalanced loads is studied. The most used index for calculating the imbalance rate is the Voltage Unbalance Factor VUF. To maintain the Voltage Unbalance Factor $VUF$ on the stator side to reasonable values of the order of 1–2 %, an auxiliary three-phase voltage system is integrated on the rotor side of the generator. Its RMS value and phase are fixed in order to compensate the stator voltage unbalance. Experimental results are carried out using a DFIG and a dSpace DS1104 card. These results demonstrate that the proposed strategy can maintain $VUF$ under 0.02 for strict limits of unbalance and, consequently to obtain a balanced system at the output of the machine even when the loads are unbalanced.

[1]  Heng Nian,et al.  Direct Active and Reactive Power Regulation of DFIG Using Sliding-Mode Control Approach , 2010, IEEE Transactions on Energy Conversion.

[2]  Larbi Chrifi-Alaoui,et al.  A real-time Backstepping control strategy for a doubly fed induction generator based wind energy conversion system , 2017, 2017 6th International Conference on Systems and Control (ICSC).

[3]  Lingling Fan,et al.  Harmonic Analysis of a DFIG for a Wind Energy Conversion System , 2010, IEEE Transactions on Energy Conversion.

[4]  Heng Nian,et al.  Dynamic Modeling and Improved Control of DFIG Under Distorted Grid Voltage Conditions , 2011, IEEE Transactions on Energy Conversion.

[5]  R. Datta,et al.  Variable-Speed Wind Power Generation Using a Doubly Fed Wound Rotor Induction Machine: A Comparison with Alternative Schemes , 2002, IEEE Power Engineering Review.

[6]  V. T. Ranganathan,et al.  Variable-Speed Wind Power Generation Using a Doubly Fed Wound Rotor Induction Machine: A Comparison with Alternative Schemes , 2002 .

[7]  J.A. Ferreira,et al.  Operation of Grid-Connected DFIG Under Unbalanced Grid Voltage Condition , 2009, IEEE Transactions on Energy Conversion.

[8]  M. B. A. Kammoun,et al.  Implementation and comparative study of control strategies for an isolated DFIG based WECS , 2017, The European Physical Journal Plus.

[9]  G. Abad,et al.  Direct Power Control of Doubly-Fed-Induction-Generator-Based Wind Turbines Under Unbalanced Grid Voltage , 2010, IEEE Transactions on Power Electronics.

[10]  Thillainathan Logenthiran,et al.  Analysis and compensation of voltage unbalance of a DFIG using predictive rotor current control , 2016 .

[11]  Barry W. Williams,et al.  Predictive Current Control of Doubly Fed Induction Generators , 2009, IEEE Transactions on Industrial Electronics.

[12]  M. B. A. Kammoun,et al.  Real-time integration of control strategies for an isolated DFIG-based WECS , 2017 .

[13]  R. Rajeswari.  CONTROL OF DOUBLY FED INDUCTION GENERATOR BASED WIND ENERGY CONVERSION SYSTEM , 2014 .

[14]  Wei-Jen Lee,et al.  Effects of Voltage Unbalance and System Harmonics on the Performance of Doubly Fed Induction Wind Generators , 2008, 2008 IEEE Industry Applications Society Annual Meeting.