Mathematical model for the doubly fed wound-rotor generator
Conference
·
OSTI ID:5717102
Present electrical power generators dictate that the prime movers operate at constant speed. This is necessary because the power must be generated at constant frequency. However, some prime movers are, by their nature, not constant-speed-devices, such as hydroturbines and wind turbines. Various schemes have been proposed that remove the constant-speed requirement. The scheme investigated in this paper is a wound-rotor generator, whose rotor is excited with variable-frequency power. This paper develops a mathematical model which predicts what the rotor excitation must be, if the stator is to operate at constant frequency and voltage. A machine with three-phase rotor and stator is analyzed. It is described by two sets of circuit equations; one set for the stator, another for the rotor. Under balanced conditions, these two sets reduce to only two equations. In practical application, these machines are operated with constant stator-terminal voltage. When this constraint is applied to the two circuit equations, expressions for currents and voltages, on both rotor and stator are obtained. These same circuit equations can be used to generate a set of volt-ampere equations. If the expressions for current and voltages are substituted into the volt-ampere equations, a relationship between active stator volt-amperes, active rotor volt-amperes, and shaft power is obtained. This relationship permits a new interpretation of the power flow.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- AI01-76ET20320
- OSTI ID:
- 5717102
- Report Number(s):
- DOE/NASA/20320-48; NASA-TM-83454; CONF-830705-5; ON: DE83018232
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mathematical model for the doubly-fed wound rotor generator. Part II
Stand alone variable speed constant frequency generators
Application of Floquet's theory to the analysis of series-connected wound-rotor self-excited synchronous generator
Conference
·
Sat Dec 31 23:00:00 EST 1983
·
OSTI ID:6837973
Stand alone variable speed constant frequency generators
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:220093
Application of Floquet's theory to the analysis of series-connected wound-rotor self-excited synchronous generator
Journal Article
·
Wed Sep 01 00:00:00 EDT 1993
· IEEE Transactions on Energy Conversion (Institute of Electrical and Electronics Engineers); (United States)
·
OSTI ID:5680918