Model circuit of a salient-pole machine

摘要

A circuit arrangement (9') uses entered values for the stator current (i@), rotor resistance (R) and an inductance parameter which is allocated to the main inductance of the machine, corresponds to a fictional non-salient pole machine (cylindrical rotor machine) and is preferably selected to be equal to the quadrature-axis inductance (xq) of the actual salient-pole machine, and an entered, fictional excitation (energising) current value (i@) to determine a flux (magnitude psi , space vector phi L). The fictional excitation current value can be calculated in a computation element (7') from a predetermined flux ( psi *), the stator current (i@) and the inductance parameter (xq) of the fictional non-salient pole machine and can be compensated for, in order to take into account the salient nature of the actual machine, in an output stage (8') using a disturbance variable from the direct-axis inductance (xd), the quadrature-axis inductance (xq) and the model flux and its rotor-related direct-axis component ( psi d = psi . cos psi L) in order to determine the excitation current (i) associated with the predetermined flux ( psi *) (Fig. 6). In a reversed manner, if the true excitation current (i) is preset, the fictional excitation current can also be formed by use of this disturbance variable and the model flux can be determined in the circuit arrangement (95) as the value of the flux associated with the true excitation current.