Istomina N. Information technology of power processes analysis and control optimization for switched reluctance motors

The dissertation is devoted to the decision of the actual scientific and practical problem of increase of efficiency and informativeness for control and operation of the switched reluctance motor in a complex with the power converter and technological object. The operation principles of the switched reluctance motor are analyzed in the work. The main advantages of the switched reluctance motor, its shortcomings and ways of their elimination are defined. The work is based on two ideas: linking the mathematical description of energy conversion processes in an inductor machine to working points depended on the form of phase inductance; the use of a universal mathematics model of a switching impulse using key switching points. To implement these ideas, a multi-agent system divided into basic analytical and calculated levels was proposed. The input, output data and rules of behavior are defined for each agent of this system. Moreover, each agent is conditionally independent; it can be replaced by an agent similar in function and having a different internal structure. As a result, the model for calculating the energy conversion in the power converter – switched reluctance motor – technological object complexes was improved. The developed model is distinguished by the use of a multi-agent subsystem for identifying instantaneous losses, taking into account the resistance moment of the technological mechanism, and design features of the motor. The developed model allows determining the torque, speed, instantaneous phase currents and motor heating. The information technology for analyzing energy processes and optimizing the switch control of a power converter for a switched reluctance electric drive was improved. The developed information technology is distinguished by the use of multi-agent models for determining instantaneous losses and electromechanical characteristics, by the method of finding the optimal control laws for a power converter. The developed information technology makes it possible to determine the suitability of the selected switched reluctance motor for the given conditions and to ensure the fulfillment of the technological task. The method for optimizing the control of a power converter of a switched reluctance motor has been further developed. The improved method is characterized by the use of multiple models generating an instantaneous value for a numerical estimate of process conditions. The method uses the search for the minimum of the integral quality criterion. The developed quality criterion takes into account the need to operate the motor at a given speed, to perform technologically determined useful work under striving to minimize losses in the inductor machine. Based on the results of the simulations, a knowledge base on the choice of the commutation pulse shape for certain engine operating conditions is formed. All of the above makes it possible to increase the efficiency of an electric drive based on a switched reluctance motor and to ensure the fulfillment of a technological task.