Abstract
The authors propose an algorithm for identifying the parameters of a controlled asynchronous electric drive in real time, which provides calculation of stator and rotor resistances which change as a function of temperature. The algorithm is based on the analysis of a current tube of electric motor phase with the subsequent calculation of resistances.
Highlights
In most cases, when solving problems of identifying the parameters of an asynchronous electric drive, the timeaveraged values of the observed variables are taken into account, regardless of the method of its identification [1,2,3,4]
The discrete time intervals in modern electric drives with vector control are uniquely related to the pulsewidth modulation frequencies and the switching frequencies of the power switches
The duration of the key switching intervals lies in the range of tens of microseconds, which clearly makes it possible to consider the system linear in the small
Summary
In most cases, when solving problems of identifying the parameters of an asynchronous electric drive, the timeaveraged values of the observed variables are taken into account, regardless of the method of its identification [1,2,3,4]. The transition to identification, taking into account the instantaneous values of the observed variables, makes it possible to identify, at discrete time intervals, areas of linear change of variables, at which the drive system is linear. The temperature drift of active resistances of rotor and stator of asynchronous motor is usually not taken into account when solving control problems, and if it is taken into account, the method is in building thermal models implemented as separate software modules [5,6,7,8]. An algorithm for indirect determination of stator active resistance in real time is considered
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