Method of correcting flux midpoint in flux-controlled alternating current systems

Abstract

The invention relates to a method of correcting the flux midpoint in flux-controlled alternating current systems, the method comprising the steps of determining a stator flux estimate (ψs,est) and determining the magnitude of stator current (is). The method is characterized by the steps of forming the scalar product between the stator flux estimate (ψs,est) and the stator current (is) in order to obtain a reference variable (k), low-pass filtering the reference variable (k) in order to obtain a low-frequency component (kfilt) of the reference variable (k), subtracting the low-frequency component (kfilt) from the reference variable (k) in order to obtain a difference variable (e), determining correction term components (ψs,x,corr, ψs,y,corr) of the staror flux estimate (ψs,est) by multiplying the difference variable (e) by the components (ψs,x,est, ψs,y,est) of the stator flux and correction coeficient (Kψcorr), and forming a stator flux (ψs,fin) with a corrected midpooint on the basis of the components (ψs,x,est, ψs,y,est) of the stator flux estimate and correction term components (ψs,x,corr, ψs,y,corr).

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