The theory of decision-making in problems of energy-efficient electric drive control with a double inverter-fed induction motor

This paper address the problems of implementing energy-efficient control of an electric drive with a double-fed motor with two frequency converters in the stator and rotor using decision theory. The presence of two converters allows for the implementation of a large number of energy-efficient algorithms, even with significant changes in speeds and loads on the shaft. Compliance with the temperature conditions of its elements in all operating modes is also important for the electric drive. Pulse-Width Modulation and an energy-efficient control algorithm defined by the developer have a mutual effect both on the temperature of the power switches of frequency converter inverters, the phase windings of the motor, and its elements, and on losses in these parts of the drive. The problem of designing an electric drive with a double inverter-fed induction motor can be attributed to the class of multi-criteria deterministic static problems of decision theory. The article presents a generalized formulation for finding the best solution and identifies the main problems of this procedure, which have a conceptual nature - the need to normalize local criteria, to determine the area of compromise, and to choose a compromise scheme and the corresponding principle of optimality, taking into account the priority of criteria.