Abstract
Accurate knowledge of the magnitude and position of the magnetic flux is essential for implementing field-oriented control (FOC) and achieving high-performance behaviour of AC drives. For estimating the flux in a wide range of speeds, so-called hybrid flux estimators, which are a combination of current-model and voltage-model based estimators, are usually used. Since the inductances are used as parameters in the current model, knowledge of the actual flux–current relationship, i.e., of the actual flux linkage map, is inevitable. In this paper, a novel experimental method for identifying the flux linkage map of an electrically excited synchronous machine (EESM) with double stator winding is proposed, which, unlike most existing experimental methods, does not require an additional machine to be used as a load. The flux is determined for different operating points to which the unloaded and sped-up machine is brought to by injecting d- and q-axis stator current components, whereby the current controllers are used to keep them constant for a certain operating point. The proposed method has been used to identify the flux linkage map of a medium-voltage EESM with double stator winding. A more than acceptable accuracy confirmed by comparison with three different analytical methods, together with the fact that it does not require a complex experimental setup, makes the proposed method suitable for the identification of a machine’s flux linkage map in an industrial environment.
Highlights
Excited synchronous machines (EESMs) are mainly associated with power generation
This paper presents a novel experimental method for the identification of the flux linkage map of a medium-voltage excited synchronous machine (EESM) with double stator winding in case where it is not possible to use a complex laboratory-like experimental setup or perform finite element method (FEM) simulations without knowing the exact geometry, i.e., construction of the machine
The proposed method is suitable for synchronous machines with controllable excitation, i.e., electrically excited synchronous machines (EESMs), in which the reluctance torque does not lead to a significant change in the machine’s speed during the identification process
Summary
Excited synchronous machines (EESMs) are mainly associated with power generation. Like in other constant or variable speed methods, the identification of the flux linkage map is done by injecting the d- and q-axis stator current components into the machine, whereas an approach similar to the one proposed in [24] was used to eliminate the influence of the resistance on the flux calculation. Since we shall consider a machine in which there is no phase shift between the stator Ll f is the field winding leakage inductance, usd and usq are the d- and q-axis stator voltage compowindings it isq-axis possible assume the following nents,(YY0 isd andconnection), isq are the d- and stator to current components, ψsd and ψequalities: sq are the d- and q-axis stator flux components, and ω is the electrical speed.
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