Sistemul a fost simulat in Matlab/Simulink, iar apoi a fost implementat in timp real folosind placa de control dSPACE. Semnalul de control (cuplul T Imref ) este trimis ca si referinta prin dSPACE, invertorului, care returneaza in timp real cuplul (T IM ) si turatia (ω IM ) estimate, ale masinii de inductie. Comportamentul sistemului a fost analizat prin compararea formelor de unda obtinute din imulare si experiment (figura 7.12), considerand o forma a vantului de tip treapta intre 10-9 [m/s] cu o perioada de 40 de secunde. Similitudinea formelor de unda, demonstreaza corecta functionare a emulatorului de turbina eoliana construit. Avantajele folosirii unui astfel de emulator sunt: flexibilitate (pot fi testate o larga varietate de turbine eoliene si generatoare, fara investitii costisitoare si/sau construirea turbinelor); energia produsa de sistem poate fi foarte usor estimata; posibilitatea testarii: buclelor de control, convertoarelor de putere, elementelor de stocare, sarcinilor electrice, conectarii la retea etc.; folosirea emulatorului la diferite puteri, fiind necesara doar schimbarea anumitor componente (invertor, masina de inductie, generator) cu unele corespunzatoare puterii si cuplului dorit; modelare rapida. Standul experimental este prezentat in Fig.7.13. Figura 7.12.Rezultate obtinute din simulare (coloana din stanga) si experimental (coloana din dreapta). Figura 7.13. Standul experimental. Testarea in laborator a retelelor de timp MICROGRID inpune realizarea unor emulatoare pentru sursele de energie. Emulatorul propus, modelat si testat, poate fi utilizat pentru simularea functonarii unei turbine de vant sau microhidro, in diverse regimuri, comandate prin intermediul calculatorului. In concluzie, de subliniat ca toate obiectivele stiintifice si tehnice aferente activitatiilor etapei curente au fost realizate. De asemenea au fost elaborate un numar de patru lucrari stiintifice. Bibliografie: [1.1] Bej, A., Turbine de vânt (Wind turbines), Editura Politehnica, Timişoara, 2003. [1.2] Gipe P., Wind turbine basics, Chelsea Green Publishing Company, Vermont, USA, 2009. [1.3] Deservirea energetică a unei comunităţi locale utilizând curenţii de aer, Proiect MAVA 3416/21-036/2007, Parteneriat UEFISCDI 2007-2010. [1.4] Prospect „EOLTEC” France, 2010. [1.5] Prospect “FORTIS”, Netherlands Fortis Wind Energy. [1.6] AH-5kW Pitch Controlled Wind Turbine, China Best Products Wind turbine generators [1.7] Zidaru G., - Mişcări potenţiale şi hidrodinamica reţelelor de profile, Editura Didactica şi Pedagogică Bucureşti, 1981. [1.8] Abbott I. H., Doenhoff A. E., - Theory of Wind Sections, Dover Publications, Inc., New York 1958. [2.1] Octavian Popa, Mecanica fluidelor, vol I, II, Ed. Tempus, Timişoara, 2007 [2.2] Manea Adriana Sida, Complemente de hidrodinamica turbomaşinilor, vol I, Ed. Mirton, Timişoara, 2006 [2.3] M. Bărglăzan, Turbine hidraulice şi transmisii hidrodinamice, ed. Politehnica Timişoara, 2000. [2.4] C. Stroiţă, Identificarea dinamică a turbinelor cu dublu flux, Teză de doctorat, Univ. „ Politehnica” Timişoara. 2009. [2.5] M. Bărglăzan, About design optimization of cross-flow hydraulic turbines, Sci. Bull. „Politehnica” Univ. of Tmş. Trans on Mechanics Tom 50 (64) Fasc. 2, 2005. [3.1] B. Brennen and A. Ahbondanti, “Static exciters for induction generator”, IEEE Trans. Ind. Applicat., vol.IA-13,pp.42, Sept./Oct. 1977.422-428 18
[3.2] J. M. Elders, J. T. Boys,and J. I. Woodward, “Self excited Induction machine as small low-cost generator”, Proc. Inst. Elect. Eng.,pt. C, vol 131, No. 2, pp.33-41, Mar.1984. [3.3] R. Bonert and S. Rajakarna, “Self-excited induction generator with excellent voltage and frequency control”, Proc, Inst. Elect., Eng.,, pp. 33-39, Jan. 1998. [3.4] Olorunfemi Ojo and Innocent Ewean Davidson, “PWM-VSI Inverter-Assisted Stand-Alone Dual Stator Winding Induction Generator”, IEEE Trans. on Ind. Appl.,vol.36, N0.6, Nov./Dec. 2000. [3.5] Nicolae Budişan, Problems of Induction generator systems, editura Politehnica, Timi,oara -2003. [3.6] I., J. Hunt, „A new type of induction motors”,J. IEE, vol 38, pp. 648-677, 1907. [3.7] Dong Wang, Weiming Ma, Fei Xiao, Botao Zhang, Dezhi Liu and An Hu, „A Novel Stand-Alone Dual Stator- Winding Induction Generator With Static Excitation Regulation”, IEEE Trans. On Energy Conv., vol. 20, No.4, Dec. 2005. [3.8] Yong Li, Yuwen Hu, Wenxin Huang, Lingshun Liu and Yong Zhang, „The Capacity Optimization for the Static Excitation Controller of the Dual-Stator-Winding Induction Generator Operating in a Wide Speed Range”, IEEE Trans. On Ind. Electronics, vol.56, No.2, Feb. 2009. [3.9] D. Hadiouche, H. Razik, A. Rezoug, „Modelling of Double Star Induction Motor for Space Vector PWM Control”, ICEM 2000, 28-30 Aug. 2000, Espoo Finland. [4.1] Y. Chen, P. Pillay, A. Khan, PM wind generator topologies, IEEE Trans. Ind. Applicat., Vol. 41 (2005), No. 6, pp.1619-1626. [4.2] J. Pyrhönen et al., Permanent magnet technology in wind power generators, Proc. 19th Int. Conf. Electr. Mach. – ICEM 2010, CD-ROM, 6 pp. [4.3] H. Haraguchi, S. Morimoto, M. Sanada, Suitable design of a PMSG for a small-scale wind power generator, Proc. Int. Conf. Electr. Mach. Syst. – ICEMS 2009, CD-ROM, 5 pp. [4.4] Z. Guo, L. Chang, FEM study on permanent magnet synchronous generators for small wind turbines, Proc. CCECE / CCGEI, Saskatoon, Canada, 2005. [4.5] M. Andriollo et al., Permanent magnet axial flux disc generator for small wind turbines, Proc. 18th Int. Conf. Electr. Mach. – ICEM 2008, CD-ROM, 6 pp. [4.6] J.G. Wanjiku et al., A simple core structure for small axial-flux PMSGs, Proc. Int. Electr. Mach. Drives Conf. – IEMDC 2011, CD-ROM, 6 pp. [5.1] D. Sera, “Real-time Modelling, Diagnostics and Optimised MPPT for Residential PV systems,” PhD dissertation, Aalborg University Institute of Energy Technology, Denmark, January 2009 [5.2] R.C. Campbell, “A circuit-based photovoltaic Array model for Power System Studies”, Power Symposium NAPS’07, pp 97-101, 2007 [6.1] Seul-Ki Kim, Eung-Sang Kim, Jong-Bo Ahn, “Modeling and Control of a Grid-connected Wind/PV Hybrid Generation System”, 2005-2006 IEEE PES Transmission and Distribution Conference and Exhibition, Dallas, Texas, 2006, pp. 1202-1207. [6.2] Jiangui Li; Xiaodong Zhang; Wenlong Li, “An Efficient Wind-Photovoltaic Hybrid Generation System for DC microgrid”, IEEE 8th International Conference on Advances in Power System Control, Operation and Management (APSCOM), Hong-Kong, China, 2009, pp. 1-6. [6.3] M. Dali, J. Belhadj, X. Roboam, “Theoretical and experimental study of control and energy management of a hybrid wind-photovoltaic system”, IEEE 8th International Multi-Conference on Systems, Signals and Devices (SSD), Sousse, Tunisia, 2011, pp. 1-7. [6.4] W. Caisheng, M.H Nehrir, “Power Management of a Stand-Alone Wind/Photovoltaic/Fuel Cell Energy System”, IEEE Transactions on Energy Conversion, vol. 23, 2008, pp. 957-967. [6.5] A. Testa, S. De Caro, R .La Torre, T. Scimone, “Optimal design of energy storage systems for stand-alone hybrid wind/PV generators”, IEEE 2010 International Symposium on Power Electronics Electrical Drives Automation and Motion (SPEEDAM), Pisa, Italy, 2010, pp. 1291-1296. [6.6] E. Koutroulis, K. Kalaitzakis, N.C. Voulgaris, “Development of a Microcontroller-Based, Photovoltaic Maximum Power Point Tracking Control System”, IEEE Transactions on Power Electronics, vol. 16, 2001, pp. 46-54. [6.7] W.D. Kellogg, M.H. Nehrir, G.Venkataramanan, V. Perez, “Generation unit sizing and cost analysis for stand-alone wind, photovoltaic, and hybrid wind/PV systems”, vol. 13, 1998, pp. 70-75. [6.8] F. Valenciaga, P.F. Puleston, “Supervisor control for a stand-alone hybrid generation system using wind and photovoltaic energy”, IEEE Transactions on Energy Conversion, vol. 20, pp. 398-405. [6.9] M.M. Badejani, M.A.S. Masoum, M. Kalantar, “Optimal design and modeling of stand-alone hybrid PV-wind System”, IEEE Australasian Universities Power Engineering Conference (AUPEC), Perth, Australia, 2007, pp. 1-6. [6.10] N.A. Ahmed, M. Miyatake, “A Stand-Alone Hybrid generation System Combining Solar Photovoltaic and Wind Turbine with Simple Maximum Power Point tracking Control”, CES/IEEE 5th International Power Electronics and Motion Control Conference, (IPEMC), Shanghai, China, 2006, pp. 1-7. [6.11] Y. M. Chen, Y. C. Liu, F. Y. Wu, Y. E. Wu, “Multi-Input DC-DC Converter Based on the Flux additivity”, 36th IEEE Industry Applications Society Annual Meeting Conference (IAS'01),October 2001, Vol. 3, pp. 1866-1873. [6.12] A. Napoli, F. Crescimbini, L. Solero, F. Caricchi, F. G. Capponi, “Multiple-Input DC-DC Power Converter for Power-Flow Management in Hybrid Vehicles”, 37th IEEE Industry Applications Society Annual Meeting Conference (IAS), 2002, Vol. 3, pp. 1578-1585. [6.13] Y.C. Liu, Y.M. Chen, “A systematic approach to synthesizing multi-input DC-DC converters”, IEEE Transactions on Power Electronics, 2009, Vol. 24, No. 1, pp. 116-127. 19