Kravets O. Electromechanical system for reducing the dynamic loads in pump complex

Object of research - hydrodynamic processes in a pump complex. Subject of research - the adjustable electric drive of the locking regulating pipeline fittings in a pump complex. The purpose of work is decrease in accident rate of work of a pump complex by development of the system of management of dynamic loadings in a hydraulic system on the basis of the variable-frequency electric drive of pipeline fittings with means of reserve power supply. Theoretical results: for the first time is offered and theoretically reasonable for pump complexes the law of control of the electric drive of pipeline fittings on the basis of the asynchronous motor with a short-circuited rotor which considers nonlinear dependence of coefficient of hydraulic resistance of a valve on relative extent of opening on all interval of her movement; have gained further development the principles of creation of systems of the variable-frequency electric drive of pipeline fittings by installation of feedback on pressure, flow in a hydraulic network, position of the valve, and also reserve power supply of the electric drive from an uninterrupted source or an active quencher of energy of a hydrostream that, unlike existing, allows to exclude inadmissible increase of pressure in the pipeline and to effectively use energy of a contraflow of liquid; for the first time synthesized is the optimum law of control of the variable-frequency electric drive of valve which provides the minimum dynamic loadings in a hydraulic network and the greatest possible speed of closing of valve in emergency operation at sudden shutdown of power supply. Practical results: the mathematical model of a pump complex is developed for calculations of dynamic loadings in a pipeline network in emergency and operational operating modes at the choice of the relevant law of control of the variable-frequency electric drive of valve; the structure and algorithms of functioning of the closed electromechanical system for reducing the dynamic loads in a pump complex with means of reserve power supply which have allowed to minimize increase of a pressure in a hydraulic system at control of the valve electric drive, and also to reduce accident rate and to prolong service life of processing equipment in the emergency and operational operation of his work is developed; the calculation procedure and the choice of the electromechanical equipment of valve is improved: transfer number of a reducer and the asynchronous motor of the corresponding power, and also technical indicators of the uninterruptible power supply unit (time of continuous work and output power) are defined; the technical solution, the software and method of calculation of the optimum law of control of the variable-frequency electric drive of valve which provides minimum possible dynamic loadings in a hydraulic network and time of management of valve at sudden shutdown of power supply of a pump complex is developed.