Permanent Magnet Synchronous Generators for Large Offshore wind farm connected to Grid - Comparative study between DC and AC configurations

Abstract

This paper presents a comprehensive analysis of the ability of the large offshore wind farms of 10MW to meet the requested energy imposed by the grid code using DC and AC configurations. In DC configuration, the wind turbines are linked to DC-bus through the rectifiers, and all produced energy is injected in electrical grid via an inverter.  In AC configuration, each wind turbine has a back to back converter for produced energy management, and the all subsystems are connected to grid through an AC-bus. The contribution of the paper presents two aspects: -The first aspect is focused on the energy management strategies using balance control, delta control and absolute control. -The second is related to the performances comparative study between the DC and AC configurations. For all configurations, the speed of the permanent magnet synchronous generator, the DC-bus voltage, and the exchanged power between wind farm and the network are controlled using grid code constraints (balance control, delta control and absolute control). To show the performances of the control strategies, some simulation results obtained with DC and AC configurations are presented and analyzed using Matlab/Simulink software.

Keywords

• Active and reactive power control; AC/DC converter; Grid code ; DC/AC converter; DC-bus voltage control; Offshore wind energy management; Permanent Magnet Synchronous Generator (PMSG); Speed control; Maximum Power Point Tracking (MPPT).

References

1. P. Bresesti, Wil L. Kling, Ralph L. Hendriks, and R. Vailati"HVDC connection of offshore wind farms to the transmission system" IEEE Transaction on energy conversion, vol.22, no.1, pp.37-43, March 2007.
2. L. Max, "Design and control of a DC collection grid for a wind farm"Ph.D.dissertation .Dept of Energy and Environment, Univ. Goteborg, Sweden, 2009.
3. S.Lundberg "Conguration study of large wind parks" Ph.D. dissertation .Deptof Energy and Environment, Univ. G¨oteborg, Sweden, 2003
4. F. D. Bianchi, H. D. Battista, and R. J. Mantz, "Wind Turbine Control Systems: Principles, Modelling and Gain Scheduling Design", London Springer, 2007.
5. B. Singh and S. Sharmay, “Stand-alone wind energy conversion system with an asynchronous generator”, Journal of Power Electronics, vol. 10, no. 5, pp. 538- Sept. 2010.
6. A.E. Fitzgerald, C. Kingsley, Jr., and S.D. Umans; "Electric Machinery", Textbook Sixth Edition. New York: McGraw-Hill, 2003.
7. M.S.Camara; M.B. Camara; B.Dakyo; H.Gualous, “Modeling and Control of the Offshore wind energy system based on 5MW DFIG connected to grid’’, IEEE-AFRICON Conference, pp.991-995;2013.
8. A. Tapia, G. Tapia, and J. Ostolaza, “Modeling and control of a wind turbine driven doubly fed induction generator,” IEEE Trans. Energy Conversion, vol. 18, no. 2, pp. 194–204, 2003.

9. T. Senjyu, R. Sakamoto, and N. Urasaki, “Output power leveling of wind turbine generator for all operating regions by pitch angle control”, IEEE Trans. Energy Conversion, vol. 21, no. 2, pp. 467–475, 2006.
10. Guangchen Liu, Shengtie Wang, Hong Zhang, and Bo Wang, “Integrated Control Strategy of Multibrid Wind Power Generation System”, IEEE 7th Inter. Power Electronics and Motion Control Conf. - ECCE Asia. June 2-5, 2012, Harbin, China. D.Ikni, M.B. Camara, A.Payman and B.Dakyo
11. "Dynamic control of wind energy conversion system", Inter. conference and exhibition on Ecological Vehicles and Renewable Energies (EVER’13) to be held at Monaco/France on March 27-30, 2013.
12. Lijun He , Yongdong Li , and Ronald G. Harley “Adaptive Multi-mode Power Control of a Direct-Drive PM Wind Generation System in a Micro grid”, IEEE journal of emerging and selected topics in power electronics , Vol.1, no. 4, pp. 217-225. Dec 2013. Mandic, G. ; Nasiri, A. ; Ghotbi, E. ; Muljadi, E.,
13. "Lithium-Ion Capacitor Energy Storage Integrated With Variable Speed Wind Turbines for Power Smoothing ", IEEE Journal of emerging and selected topics in power electronics, vol. 1, no. 4, Dec.2013.
14. Mohamed Mansour, M. N. Mansouri, M.F. Mmimouni, “Study and Control of a Variable-Speed Wind-Energy System Connected to the Grid”, Inter. Jour. of Renewable Energy Research, IJRER, Vol.1, No.2, pp.96-104, 2011.
15. Junbiao Han, Sarika Khushalani Solanki,and Jignesh Solanki," Wind/Battery Microgrid System", IEEE Journal of emerging and selected topics in power electronics, vol. , no. 4, Dec. 2013. Predictive Control of a
16. V. Yaramasu; B. Wu, "Predictive Control of Three- Level Boost Converter and NPC Inverter for High Power PMSG-Based Medium Voltage Wind Energy Conversion Systems", IEEE Trans. on Power Electro., Vol. PP, no: 99, 2013.
17. M.O.F.Diallo, M.B. Camara , S. Youssef, H.Gualous, B. Dakyo, “Energetic capability Characterization of the Raz Blanchard area for the tidal turbine farm implementation”, IEEE Inter. Conf., AFRICON, 9- 12 Sept.2013, Mauritius.
18. M.B. Camara, B. Dakyo, C. Nichita, G.Barakat, “Simulation of a Doubly Fed Induction Generator with Hydro Turbine for Electrical Energy Production”, IEEE Inter. Conf. Electromotion 2009, July 1-3, Lille,
19. FRANCE, Proceedings CD. D.Ikni, B.Dakyo, A.O.Bagre, " Large Offshore Wind Farm: Potential Evaluation of Network Services ", PowerTech 2013, IEEE Conference, 16-20 juin 2013, Grenoble, France.
20. Cosmin E. Bănceanu, Iulian V, " Coordinated control of wind turbine" , Master Thesis, Dept. Energy Technology - Pontoppidanstræde 101 Aalborg , Univ Aalborg , Denmark, 2011.