High Speed Field Oriented Control
Author
Stopa, Pawel
Term
4. term
Education
Publication year
2009
Abstract
This project develops a control algorithm for a high-speed electric drive. An introductory analysis shows the advantages of field-oriented control over other methods, such as more precise control of torque and speed. The chosen variant, stator-flux-oriented control (SFOC), requires two estimators: one for stator flux and one for rotational speed. Estimators are software calculations that infer unmeasured quantities from available measurements. Both estimators are included in the algorithm design. The algorithm was first tested in simulation and then experimentally on an induction drive in the laboratory. Because a high-speed motor was not available at the university, the solution was adapted and tested on a conventional 50 Hz induction motor. The intention was to apply the working control to a high-frequency motor available in the Danfoss laboratory, but this could not be done within the available time. Consequently, all conclusions are based on tests with the conventional motor.
Dette projekt udvikler en styringsalgoritme til et højhastighedsdrev (højfrekvent elmotor). En indledende analyse viser fordele ved feltorienteret styring sammenlignet med andre metoder, for eksempel mere præcis kontrol af moment og hastighed. Den valgte variant, stator-fluks-orienteret styring (SFOC), kræver to estimatorer: én der beregner statorfluksen og én der beregner omdrejningshastigheden. Estimatorer er beregninger i softwaren, der udleder størrelser, som ikke måles direkte, ud fra tilgængelige målinger. Begge estimatorer er indarbejdet i designet af algoritmen. Algoritmen blev først afprøvet i simuleringer og derefter eksperimentelt på et asynkrondrev i laboratoriet. Da der ikke var adgang til en egentlig højhastighedsmotor på universitetet, blev løsningen tilpasset og testet på en konventionel 50 Hz asynkronmotor. Planen var efterfølgende at anvende den fungerende styring på en højfrekvensmotor i Danfoss’ laboratorium, men det var ikke muligt inden for tidsrammen. Derfor bygger konklusionerne på resultater fra den konventionelle motor.
[This apstract has been rewritten with the help of AI based on the project's original abstract]