| 摘要 |
The invention relates to a method for simulating the actual load angle value ( nu ) of polyphase machine from the terminal voltages (uR, uS) and conductor currents iR, iS) of at least two phases (R, S) of the stator of a polyphase machine, each of which represents stator-oriented a-c variables, where said stator-oriented a-c variables (uR, uS, iR, iS) are transformed into a first stator current component (i1) and a second stator current component (i2) of the machine current vector (is) and an absolute value of the machine flux vector (¦ phi s¦), each of which are field-oriented d-c variables. According to the invention, a first corrected stator current component (i1) consisting of a stationary component (i1s) and a dynamic component (i1d) is generated where the stationary component (i1s) is determined form the absolute value of the machine flux vector (¦ phi s¦) divided by the value of the main machine inductance (1H) and the dynamic component (i 1d) is equal to the high-frequency share of the first stator component (i1) and the actual load anglevalue ( nu ) is derived form the relation nu =tan-1 i2/i1. Thus, the actual load angle value ( nu ) can be simulated over the entire control ragne of the polyphase machine without error.
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