Title :
Supporting unbalanced grids with induction machine drives by inverters without intermittent energy storage
Author :
Krischan, Klaus ; Seebacher, Roland ; Muetze, Annette
Author_Institution :
Graz Univ. of Technol., Graz, Austria
fDate :
Aug. 30 2011-Sept. 1 2011
Abstract :
A method for supporting unbalanced grids by utilizing a drive system with induction machine and inverter with no or low intermittent energy storage is proposed. Even though the instantaneous power, that is drawn from the mains is oscillating, the torque and speed of the machine are maintained constant. A strategy for obtaining the time dependent reference values for the flux linkage and the torque building current of a rotor field oriented control of an induction machine is presented. Some necessary enhancements to the control algorithm are discussed. Simulation results show the feasibility of the proposed method and control schemes. Measurement results from a practical implementation are given. A discussion of additional losses inherent to the proposed method and control schemes concludes the paper.
Keywords :
induction motor drives; invertors; machine vector control; power grids; power supply quality; rotors; torque control; flux linkage; induction machine drives; instantaneous power; inverters; losses; machine speed; machine torque; rotor field oriented control; time dependent reference value; torque building current; unbalanced grids; Buildings; Couplings; Differential equations; Rotors; Stator windings; Torque; Control of drive; Distributed power; Induction motor; Power quality; Three-phase system;
Conference_Titel :
Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-61284-167-0
Electronic_ISBN :
978-90-75815-15-3
