Excitation device
View Patent ↗In an excitation device for stators of generators for high-induction measurement, the greatest possible compensation of the reactive power requirement is achieved. Depending on the size and energy requirement of the generator, a number of individual excitation modules with a corresponding number of individual excitation windings are provided, wherein a minimum necessary total excitation current can be supplied by superimposing the individual currents of the excitation windings.
1. An excitation device, for stators of generators for high-induction measurement having a greatest possible compensation of a reactive power requirement, comprising:
a plurality of individual excitation modules with a corresponding plurality of individual excitation windings arranged around the stator, and there is no electrical series connection of the individual excitation windings, wherein
each of the individual excitation modules produces an individual current which flows in its respective excitation winding, and all of the individual currents of the excitation windings are superimposed in the stator to produce a necessary total excitation current for the stator, and the individual excitation modules each have an output current controller, and the output current controllers control respective individual excitation modules to act as current sources regardless of a load voltage occurring at any one time and supply required output current regardless of load situations, and the output current is generated in the form of a control variable according to a setpoint.
2. The excitation device as claimed in claim 1 , wherein the individual excitation module is coupled to a number of excitation turns.
3. The excitation device as claimed in claim 2 , wherein part of the total excitation current required is provided by the excitation winding.
4. The excitation device as claimed in claim 1 , wherein the individual excitation modules have a controlled and mutually synchronizable output current feed.
5. The excitation device as claimed in claim 1 , wherein a total current required flows in a time characteristic by superimposing the individual currents of the excitation windings.
6. The excitation device as claimed in claim 1 , wherein the individual excitation module draws an individually required active power from a supplied energy source.
7. The excitation device as claimed in claim 1 , wherein the excitation windings of the individual excitation modules have electrical circuits which are isolated from one another.
8. The excitation device as claimed in claim 1 , wherein the individual excitation module has its own energy store, which absorbs at least part of a total reactive energy which occurs.
9. The excitation device as claimed in claim 1 , wherein the individual excitation module has an output filter that filters current outputted from the individual excitation module.
10. The excitation device as claimed in claim 9 , wherein the output filter comprises a series inductor.
11. The excitation device as claimed in claim 10 , wherein the output filter comprises a series arrangement of inductors and a parallel arrangement of capacitors.