Kovalchuk V. Energy efficiency control of the adjustable electric drive of the electrohydraulic complex with identification the parameters of the hydrosystem

In the practice of operation of electrohydraulic complexes (EHC) quite often there are non-stationary processes associated with the development of complex hydrody-namic phenomena. They are accompanied by an unstable flow of fluid in the hydraulic system, which are characterized by changes in pressure signals and flow over time and leads to deviation of parameters of the pump unit (PU) and hydraulic network from their nominal values. The dissertation is devoted to the decision of an actual scientific problem of in-crease of efficiency of electrohydraulic complexes functioning with the frequency-regulated electric drive based on the harmonic power analysis at the power channel and definition the hydrosystem current parameters in stationary and non-stationary modes. In the dissertation theoretically proved and experimentally confirmed that during the development of non-stationary hydraulic processes in the pipeline network the en-ergy processes in the electrohydraulic complex have the character of periodic constant power fluctuations on the analyzed time interval with increasing variable component. In the dissertation the method of identification of an electrohydraulic complex pa-rameters received further development. It based on equations of energy balance be-tween a power supply and elements of the power channel that allows to define current parameters of hydraulic systems in stationary and nonstationary modes of operation, to calculate service life of pump and pipeline equipment regarding their repair or re-placement. The system of automatic control of the frequency-regulated electric drive of the pump complex at stabilization of pressure at the consumer which provides, unlike ex-isting, increase of energy efficiency of an electrohydraulic complex by periodic defini-tion of current parameters of hydraulic system and application of two-parameter regu-lation of parameters based on simultaneous valves at the pump outlet. The efficiency of using the energy method in identification the parameters of the electrohydraulic complex physical model is proved.