Use of a finite element model for the determination of damping and synchronizing torques of hydroelectric generators
2013 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 44, no 1, 844-851 p.Article in journal (Refereed) Published
Damping and synchronizing torque coefficients are calculated from time-stepped finite element simulations of a hydroelectric generator connected to an infinite busbar. The calculated torque coefficients are compared to those obtained from two-axis equivalent circuit simulations as well as classical analytical expressions. The influence of the damper winding type, and the size and nature of the system disturbance on the damping and synchronizing torques is explored. It is found that a finite element model of a hydroelectric generator typically exhibits both higher damping and synchronizing properties compared to a two-axis circuit equivalent of the same unit. In particular, the damping and synchronizing contributions from a continuous damper winding are substantially higher in the finite element model than in the equivalent circuit model. Moreover, explicit consideration of dynamic iron losses is found to not affect the damping and synchronizing torques predicted by the finite element model.
Place, publisher, year, edition, pages
2013. Vol. 44, no 1, 844-851 p.
Damping torque, finite element method, single-machine infinite bus system, synchronizing torque, synchronous machines
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Science of Electricity
IdentifiersURN: urn:nbn:se:uu:diva-182158DOI: 10.1016/j.ijepes.2012.08.027ISI: 000311864800094OAI: oai:DiVA.org:uu-182158DiVA: diva2:558606