Abstract
The standard implementation of an asynchronous electric drive according to the scheme of a doubly fed machine is that the stator of the asynchronous machine is connected to the network, and the rotor circle is powered by a frequency converter. Extreme adjustment of the reactive power of the rotor doubly fed machine is carried out by the stator. At the same time, the objective function includes the moment of static load, which cannot be measured. Therefore, to determine the load moment an observer was developed, which is in the feedback loop of the vector control system of the doubly fed machine. The observer evaluates the moment of load on the shaft of the asynchronous machine during its sudden changes.
 In the paper using the method of modal control the synthesis of the observer of static load on the shaft of the doubly fed machine was carried out. The synthesis is based on the equations of the active power channel of the doubly fed machine in the coordinate axes oriented along the stator flux coupling vector. The synthesis of the observer was carried out based on the assumption that the moment of load on the shaft of an asynchronous machine varies according to the fan characteristic. However, when one parameter is set to zero, the structure of the observer presented in the article can be used to calculate the constant moment of the load, including when it changes abruptly. The synthesis of the observer was carried out based on the assumption that the parameters of the asynchronous machine, which are used in the calculation of the parameters of the observer, are precisely known and do not change during operation.
 The asymptotic stability of the observer of the load moment on the shaft of the doubly fed machine was confirmed by the method of mathematical modeling, and its accuracy and speed are sufficient for the purposes of extreme control. Further research can be aimed at finding such observer structures that will be invariant to changes in some parameters of the electric machine.
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