Method for controlling doubly-fed machine

Details Method for controlling doubly-fed machine Method for controlling doubly-fed machine

2006-04-04

2006-04-04

Martin, David (Department: 2837)

Electricity: motive power systems

Power factor control of armature or line circuit

C318S494000, C318S143000, C318S453000, C318S454000, C318S035000, C318S254100, C290S008000

Reexamination Certificate

active

07023160

ABSTRACT:
A method for operating a doubly-fed machine by determining its rotational speed (nact), forming a rotational speed reference (nref), measuring network voltage and current, and calculating network active power (Pact) and reactive power (Qact). Thereafter, calculating shaft torque (T) based on active power (Pact) and rotating speed (nact), forming a frequency reference (Fref) for the inverter based on machine rotating speed (nact), rotating speed reference (nref), shaft torque (T), and the known pole pair number and network frequency, forming a reactive power reference (Qref) for the machine. Forming an Ir compensation reference (IRref) for the inverter on the basis of the reactive reference (Qref) and the reactive power (Qact), and controlling the inverter to produce rotor voltage based on frequency reference (Fref) and the IR compensation reference

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