Oboronov T. Models and diagnostic tools of energy and technical condition of synchronous electric drive of pumping units.

The thesis work deals with improving of quality of operation of synchronous electric drive pumping units (SED PU). Proposed by the work solutions lie in real-time PU controlling and condition-monitored maintenance (CMM) of the unit during operation. Undertaken researches of the influence of decreasing of quality of input voltage (voltage deviation, frequency deviation, voltage unbalance and voltage nonsinusoidality) and the value of the mechanical load on the energy characteristics of synchronous motors and their analysis confirm validity and adequacy of the developed models and methods of functional diagnostics of electric drive of pumping units. In this (thesis) it was developed the methodology and software complex for determination of reference model of synchronous motors which allows to detect type of the dependence of coefficient of efficiency on the load intensity, calculate the parameters of equivalent circuit and energy characteristics for rated operating condition of electric drive. It was specifed the diagnostic features of electrical and mechanical emergency operation modes of pumping units with synchronous motors which allow to determine the pattern of damage and fulfill their timely repair without disruption of the process. Diagnostics combines methods of analysis of instantaneous values of current and voltage of SED, temperature around the unit and allows to determine energy and technical condition of SED PU and predict remaining life time. Method of spectral-current analysis allows to detect mechanical damage of the motor and connected to it mechanism in advance. Created soft and hardware of diagnostic of PU with SED - models, methods, algorithms, programs and system engineering solutions take into account the effects of the operation impacts - quality of input voltage, load condition and temperature around mechanism. Created portable hardware-software complex allows to automatize the process of functional diagnostics of energy efficiency of pump units. Keywords: electromechanical system, synchronous motor, pump unit, electric power quality indexes, electrical load schedule, energy condition, technical condition.