The influence of the self-excited induction machine into the electrical grid under instability situation - Real case measurement R. Bosch, P. Casals and A. Serrano   2017/04/25

Abstrac

The three phase induction machine is used in the mainly part of the industry and it requires reactive power from the grid to start and function. The reactive power consumption is economically fined so the industries install capacitors in parallel with the motors and loads. The bank capacitor, gives this reactive power to the machine in order to improve the cos ö factor in the installation. When a fault appears in the grid, this machine gives the active power to the fault, but when the overcurrent relay sets the fault, the induction machine is already with inertia with electromagnetic and mechanic specific parameters that originate a non-controlled islanding mode and it provides the power to the loads on this feeder. Even though several works are published within the islanding detection, the islanding operation about the induction machine as a generator in power wind energy applications, nevertheless in the following we show the motor perspective. The stability of the system in the time period between the relay opening and the fast reconnection is out of control, so a complete study a about the electric magnitudes, voltage and reactive power , active power and frequency and the angle stability is needed. In this paper we show a real case that appears in a distribution Medium Voltage (MV) radial network in Spain in a 25 kV feeder and we summarize the voltage /current wave form and the frequency oscillation.

Authors and affiliations

R. Bosch(1), P. Casals(1) and A. Serrano(1,2)
1 Department of Electrical Engineering. E.T.S.E.I.B, Polytechnic University of Catalonia. Barcelona (Spain)
2 Electrica Serosense Distribuidora. Pol. Ind. Panamà. Torres de Segre (Spain)

Key word

Power Quality, distributed generation, electrical transients, islanding mode, induction machine, non-synchronism situation.

References

[1] M.Pérez Donsión, La calidad de la energia eléctrica. Garceta Grupo Editorial, 2016.
[2] A. R. Di Fazio, G. Fusco, and M. Russo, “Islanding detection method based on a Thevenin-like model,” IET Gener. Transm. Distrib., vol. 9, no. 13, pp. 1747–1754, 2015.
[3] F. Ji, Y. Li, J. Xiang, and S. Liu, “Islanding detection method based on system identification,” IET Power Electron., vol. 9, no. 10, pp. 2095–2102, 2016.
[4] S. Li, K. El-Arroudi, G. Joós, and A. J. Rodolakis, “Islanding protection of multiple distributed resources under adverse islanding conditions,” IET Gener. Transm. Distrib., vol. 10, no. 8, pp. 1901–1912, 2016.
[5] R. Anne, F. Katha Basha, R. Palaniappan, K. L. Oliver, and M. J. Thompson, “Reliable Generator Islanding Detection for Industrial Power Consumers With On-Site Generation,” IEEE Trans. Ind. Appl., vol. 52, no. 1, pp. 668–676, 2016.
[6] A. R. Bergen and V. Vittal, Power Systems Analysis. Prentice Hall, 2000.
[7] A. Exposito, Gómez, Análisis y operación de sistemas de energia eléctrica, Mac. McGraw-Hill,2002.
[8] J. C. Das, “Effects of Momentary Voltage Dips on the Operation of Induction and Synchronous Motors,” IEEE Trans. Ind. Appl., vol. 26, no. 4, pp. 711–718, 1990.
[9] M. H. Bollen, Understanding Power Quality Problems: Voltage Sags and Interruptions. Wiley, 2000.
[10] M. H. J. Bollen, “Influence of motor reacceleration on voltage sags,” IEEE Trans. Ind. Appl., vol. 31, no. 4, pp. 667–674, 1995.
[11] F. P. De Mello and G. W. Walsh, “Reclosing Transients in Induction Motors with Terminal Capacitors,” AIEE Rotating Mach. Comm., 1961.
[12] C. Wagner, “Self-excitation of induction motors with series capacitors,” Trans. Am. Inst. Electr. Eng., vol. 60, no. 12, pp. 1241–1247, 1941.
[13] Siemens PSS-SINCAL “Power systems analysis Software” Available: https://www.siemens.com