Comparison of different methods for excitation of synchronous machines

• Autorzy: Schmuelling S. , Kreischer Ch. , Gołȩbiowski M.
• Języki publikacji: EN

Abstrakty

EN

The energy turnaround in Germany leads to new operating conditions for small and medium synchronous generators. Since the electricity generation through renewable energy sources, such as wind or photovoltaic, is highly volatile, generators have to run up from standstill into rated operation within several minutes. Hence, it is necessary to compensate a lack of electricity generation caused by wrong weather forecasts. Usually, gas turbine systems provide this possibility. The generator is used as a starter engine due to the connection to a frequency inverter. The excitation current is often provided by static excitation systems. Thus, it is possible to start from standstill and run up the drive until the gas turbine is able to generate a positive torque. A new excitation concept, based on an induction machine with a 3-phase rotor winding, is able to provide an excitation current at 0 rpm and eliminates the need for brushes. To verify the applicability for power systems, both systems are compared under different aspects. The control of the excitation current at different speeds and the possibility to settle shaft oscillations after electrical faults are aspects researched in the paper at hand. A power system simulation is performed with a synchronous machine connected to a grid. Both excitation systems are modeled by equivalent circuit diagrams in Matlab Simscape.

Słowa kluczowe

EN

AC machines; Brushless machines; Electromagnetic transients; Excitation system; Power system simulation

• Wydawca: Sieć Badawcza Łukasiewicz - Górnośląski Instytut Technologiczny
• Czasopismo: Maszyny Elektryczne : zeszyty problemowe
• Rocznik: 2015
• Tom: Nr 3 (107)
• Strony: 89--93
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Schmuelling S.

• TU Dortmund University, Chair of Energy Conversion

autor

Kreischer Ch.

• TU Dortmund University, Chair of Energy Conversion

autor

Gołȩbiowski M.

• Rzeszow University of Technology, Faculty of Electrical and Computer Engineering

Bibliografia

• [1] S. Schmuelling and S. Exnowski, "Start-up performance of very large synchronous generators," in 2013 Fourth International Conference on Power Engineering, Energy and Electrical Drives (POWERENG), May 2013, pp. 305–308.
• [2] D. Thien, "Effects and analysis of the altered operation of gasturbine power plants, [in German: Betriebsauswertung und Analysen zur veränderten Fahrweise Gasturbinengetriebener Fossiler Kraftwerke]," 8. Essener Tagung: Turbogeneratoren in Kraftwerken, Feb 2015.
• [3] "IEEE Standard Definitions for Excitation Systems for Synchronous Machines," IEEE Std 421.1-2007 (Revision of IEEE Std 421.1-1986), pp. 1–33, July 2007.
• [4] G. Klempner and I. Kerszenbaum, Operation and Maintenance of Large Turbo-Generators, ser. IEEE Press Series on Power Engineering. John Wiley and Sons, Inc., 2004.
• [5] L. Golebiowski, M. Golebiowski, and D. Mazur, "Inverters operation in rigid and autonomous grid," COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 32, no. 4, pp.1345–1357, 2013.
• [6] C. Ammann, K. Reichert, R. Joho, and Z. Posedel, "Shaft voltages in generators with static excitation systems-problems and solution," IEEE Transactions on Energy Conversion, vol. 3, no. 2, pp. 409–419, Jun 1988.
• [7] L. Golebiowski, M. Golebiowski, and D. Mazur, "Voltages in the shaft of the induction motor in 3d fem formulation, " in IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, 2007. SDEMPED 2007, Sept 2007, pp. 142–145.
• [8] "IEEE Recommended Practice for Excitation System Models for Power System Stability Studies," IEEE Std 421.5-2005 (Revision of IEEE Std 421.5-1992), 2006.
• [9] C. Kreischer, M. Rosendahl, Bennauer, and H. Werthes, "Dynamic behavior of steam turbine controller in the event of load rejection following a threephase short circuit close to the power plant," VGB Power Tech, vol. 91, pp. 77–79, May 2011.