POWER SYSTEM STABILIZATION BY A DOUBLE-FED INDUCTION MACHINE WITH A FLYWHEEL ENERGY STORAGE SYSTEM

Öz

This paper proposed a new idea of using a large-mass varying-speed flywheel as an energy storage element to form a novel FACTS device called multi-functional Flexible Power Conditioner (FPC). The novel device consists of a double-fed induction machine (DFIM) and a voltage-source pulse width modulation (PWM) rectifier-inverter used as an AC exciter. By changing the speed of the rotating machine, the kinetic energy stored in the rotor with the flywheel will be changed. With an appropriate control strategy, it is able to realize an independent active and reactive power exchanging between the FPC and the grid. Similar to that of the Superconducting Magnetic Energy Storage (SMES), the FPC can be used to improve the stability of power system as well as the quality of power supply. Additional advantage of the FPC over the SMES based device is that it is easy to develop and to operate. Therefore, the cost will be greatly reduced. In order to increase performance of the proposed device, an improved stator flux linkage orientated control strategy for FPC is proposed in the paper. Simulation result of applying the proposed device in a two-machine and an infinite bus system shows that the proposed control provides excellent dynamic characteristics. Very encouraging results are obtained.

Anahtar Kelimeler

• AC excitation, flywheel energy storage, vector control, stator flux linkage orientation, stability control

Kaynakça

1. H. Akagi, “Large static converters for industry and utility applications,” Proceedings of the IEEE, vol. 89, no. 6, pp. 976–983, 2001.
2. H. Akagi, H. Sato, “Control and performance of a doubly-fed induction machine intended for a flywheel energy storage system,” IEEE Trans. Power Elect., vol. 17, no. 1, pp. 109–116, 2002.
3. J. G. Slootweg, S.W. H. de Haan, H. Polinder, and W. L. Kling, “General model for representing variable speed wind turbines in power system dynamics simulations,” IEEE Trans. Power Syst., vol. 18, no. 1, pp., 144–151, Feb. 2003.
4. A. Feijoo, J. Cidras, C. Carrillo, “A third order model for the doubly-fed induction machine,” Elect. Power Syst. Res., no. 56pp.121–127, 2000.
5. J. G. Slootweg, H. Polinder, W. L. Kling, “Dynamic modeling of a wind turbine with doubly fed induction generator,” IEEE PowerEng. Soc. Summer Meeting, Vancouver, BC, Canada, July 15-19, 2001.
6. Janaka B. Ekanayake, Lee Holdsworth, XueGuang Wu, et al, “Dynamic modeling of doubly fed Induction generator wind turbines,” IEEE Trans. Power Syst., vol. 18, no. 2, pp. 803–809, 2003.
7. Yifan Tang, Longya Xu, “A flexible active and reactive power control strategy for a variable speed constant frequency generating system,” IEEE Trans. Power Electronics, vol. 10, no. 4, pp. 472–478, 1995.
8. Markus A. Poller, “Doubly-fed induction machine models for stability assessment of wind farms,” IEEE Bologna PowerTech Conference, no. 3pp. 23–26, 2003.

9. L. Holdsworth, X.G. Wu, J.B. Ekanayake, “Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances,” IEE Proc-Gener. Transm. Distrib., vol. 150, no. 3, pp. 343– 352, 2003.
10. Y. Katsuya, Y. Mitani, Tsuji, “Power system stabilization by synchronous condenser with fast excitation control.” Power System Technology, Proceedings. PowerCon. 2000 International Conference, no. 3, pp. 1563– 1568.
11. K. Koyanagi, M. Fujimitsu, T. Komatsu, “Analytical studies on power system Dynamic stability enhancement by doublyfed adjustable speed machine,” Power System Technology, Proceedings. PowerCon. 2000 International Conference, no. 3, pp. 1281–1286.