JPEE  Vol.5 No.12 , December 2017
Demonstration of a Dynamic Braking System for Reduced Runaway Speed of Hydraulic Turbines
Abstract: Reducing the overspeed during load rejection would benefit the mechanical and hydraulic systems in a hydropower station. This paper presents some selected results of a pilot installation of a dynamic braking system. The 4 MW dump load was installed and tested on a 10 MW Francis turbine unit. The results show that the overspeed reduction is obtained and compares well with simulation results. Further, a reduction in vibration levels is positive as well as the reduced time for stopping and possible resynchronization. It is argued that a similar system with continuous cooling could be used as an attractive alternative to spillway capacity.
Cite this paper: Lundin, U. and Bladh, J. (2017) Demonstration of a Dynamic Braking System for Reduced Runaway Speed of Hydraulic Turbines. Journal of Power and Energy Engineering, 5, 46-57. doi: 10.4236/jpee.2017.512007.

[1]   Kay, M. (2007) Practical Hydraulics. CRC Press.

[2]   Kilbourne, C.E. and Terry, I.A. (1932) Dynamic Braking of Synchronous Machines. Electrical Engineering, 51, 406-409.

[3]   Ellis, H.M., Hardy, J.E., Blythe, A. and Skooglund, J. (1966) Dynamic Stability of the Peace River Transmission System. IEEE Transactions on Power Apparatus and Systems, PAS-85, 586-600.

[4]   Shelton, M.L., Winkelman, P.F., Mittelstadt, W.A and Bellerby, W.J. (1975) Bonneville Power Administration 1400-MW Braking Resistor. IEEE Transactions on Power Apparatus and Systems, 94, 602-611.

[5]   IEEE Power System Engineering (1978) A Description of Discrete Supplementary Controls for Stability. IEEE Transactions on Power Apparatus and Systems, PAS-97, 149-165.

[6]   Grobovoy, A.A. (2001) Russian Far East Interconnected Power System Emergency Stability Control. Power Engineering Society Summer Meeting, 2, 824-829.

[7]   Rahim, A.H.M.A. and Al-Maghraby, H.M. (2000) Dynamic Braking Resistor for Control of Subsynchronous Resonant Modes. IEEE Power Engineering Society Summer Meeting, 3, 1930-1935.

[8]   Causebrook, A., Atkinson, D.J. and Jack, A.G. (2007) Fault Ride-Through of Large Wind Farms Using Series Dynamic Braking Resistors. IEEE Transactions on Power Systems, 22, 966-975.

[9]   Grobovoy, A.A. and Lizalek, N.N. (1998) Multiple Dynamic Brake and Power System emergency Control. 1998 International Conference on Power System Technology, Proceedings of the POWERCON’98, 2, 1351-1355.

[10]   Grobovoy, A.A., Dedukhina, E., Kosterin, V. and Lizalek, N. (2003) Third Generation System Protection Scheme Project for Zeya Hydro Power Plant. 17th International Conference on Electricity Distribution, Barecelona.

[11]   Jeong, H.G. and Lee, K.B. (2014) A Control Scheme to Fulfill the Grid-Code under Various Fault Conditions in the Grid-Connected Wind Turbines. Electrical Engineering, 96, 199-210.

[12]   Arshenevskii, N.N. and Sotnikov, G.G. (1989) Use of Electrical Braking of Units at Hydroelectric Stations When Dropping the Load. Hydrotechnical Construction, 23, 158-161.