Korenkova T. Efficient electromechanical systems of electrohydraulic complexes with monitoring of energy processes in dynamic modes

Electromechanical systems of electrohydraulic complexes belong to complicated energy-intensive objects, where the electric drive, pumps, shut-off valves, pipeline network must be considered as interconnected systems. Dissertation is devoted to solving the current scientific and practical problem of developing efficient electromechanical systems of electrohydraulic complexes based on monitoring of energy processes in all elements of the power channel. It allow timely emergency situations diagnosis and increase controllability in technological and emergency modes. In the dissertation the analysis theory of electromechanical systems of electrohydraulic complexes operating modes with application of equivalent electric circuits and the mathematical description of four-quadrant characteristics of the pump unit regulated on rotation frequency has received the further development. A method of increasing the electromechanical systems of electrohydraulic complexes controllability with using of reversible operation modes of hydraulic and electric machines of pump units when changing the speed direction and reverse fluid in case of emergency power outage is proposed. In the dissertation the analysis theory of power processes in electromechanical complexes has received the further development. It is different in systematization of approaches concerning decomposition of instantaneous power time function of nonsinusoidal signals in various circuit decisions and modes. The using of power channel capacity and power controllability coefficients during the energy processes monitoring in the electromechanical complex is substantiated. They are based on the determination of instantaneous power RMS values in all parts of the power channel. Energy models of electromechanical systems of electrohydraulic complexes based on energy balance equations of instantaneous power time function are developed and the estimation of power controllability in nonstationary operating modes was performed. The method of diagnosing emergency modes of electromechanical systems of electrohydraulic complexes was proposed. It is based on the analysis of instantaneous power derivatives and its amplitude-frequency characteristics and it is provided an opportunity to identify the nonstationary mode and to form a set of organizational and technical measures to prevent the development of the emergency regime. The main theoretical results obtained in the dissertation are tested on the created mathematical models and experimentally.