Comparison between Improved PID and LQ Multimodel Optimal Controllers for Variable-Speed Wind Turbines

Abstract

In this research study, a comparison between two improved multimodel optimal controllers PID and LQ for two bases with 4 and 8 models is proposed for a variable speed variable pitch wind turbine. This turbine uses a blade pitch angle and electromagnetic torque control to achieve objectives. But we are particularly interested in minimizing the fluctuations of the electrical power and the turbine rotational speed to allow the participation of the wind turbines in the frequency regulation. A 2 MW wind turbine is considered to clarify the achieved good performances by the proposed strategy while presenting and discussing the simulation results of the two multimodel optimal controllers PID and LQ. These results show better performance for improved LQ multimodel optimal controller than the improved PID multimodel optimal controller, and with the base of the eight models compared to the base of the four models.

Keywords:

• wind turbine
• power tracking
• improved PID controller
• improved LQ controller
• optimal

Acknowledgments

The authors wish to thank the LENREZA Laboratory at the University Kasdi Merbah of Ouargla in Algeria. The authors would also like to thank the editors and anonymous referees of the Electric Power Components and Systems Journal for their careful reading and constructive instructions, which were helpful in the improvement of the manuscript.

Additional information

Notes on contributors

Abdelkader Garmat

Abdelkader Garmat was born in Djelfa, Algeria, on January 06, 1987. He got his baccalaureate degree in natural and life sciences from Naïmi Naïm High School in Djelfa in 2005. He received an engineering degree in electrical engineering from the Ziane Achour University of Djelfa, Algeria, in 2010 then received a Master’s degree in maintenance in industrial instrumentation from the same university in 2013. Currently, he is a PhD student at the same university. His area of interest is the control of renewable energy systems (e-mail address: [email protected]).

Messaouda Azzouzi

Messaouda Azzouzi was born in Djelfa, Algeria, she had got her Engineering diploma in electronics from Ziane Achour University of Djelfa, Algeria, in 2002. She had finished her PhD thesis in automatic control from Politehnica University of Bucharest, Romania, in 2008. Actually, she is an associate professor at the Ziane Achour University of Djelfa, Algeria, and she was the head of the LMD Electronics specialty. Dr. Azzouzi has publications in many journals and she participated in many international conferences. She served as editor and reviewer of known journals and she was been joined as organizing/scientific/international program committee member in many international conferences. Her research interests include electric power components and systems (e-mail address: [email protected]).

Bachir Bouchekima

Pr. Bachir Bouchekima was born in Beja, Tunisia in 1956, he got his Licence diploma in physics sciences from USTHB of Algiers, Algeria in 1979, D.E.S. diploma in thermodynamic physics from USTHB Algiers in 1984, Magister in chemical engineering in 1992 from USTHB Algiers and state doctorate in energy process engineering in 2001 from USTHB Algiers. He worked as a professor at Amara Rachid High School, in Ben Aknoun, Algiers, and as an assistant professor at Saad Dahleb University in Blida, Algeria, from November 1979 to October 1998. Presently, he is a professor at the Kasdi Merbah University of Ouargla, Algeria. Pr. Bachir Bouchekima has publications in many journals and he participated in many international conferences. He is an adviser at the IFS International Foundation of Sciences in Stockholm, Sweden, since 2002. His research interests include electric power components and systems.