Математичне моделювання процесів в електроприводі водяного насоса з акумуляторними батареями 

Abstract

We consider scheme of power supplies of the water pump's electric drive of increase of water pressure of system of internal fire water supply from the backup source with batteries and autonomous voltage inverter, its mathematical model and simulation results of electromagnetic and of electromechanical processes in the engine during start–up and operation of the pump in absence of the main power on the network, that provides use internal fire water supply at extraordinary situations during the estimated time. This reserve system can also be used to support the continuity of processes. General mathematical model of electric drive formed with mathematical models of individual elements of the scheme represented of multipoles, and the processes in them describe a closed system of equations – differential, algebraic and logical. The estimated model of electric drive formed by the connection between the external branches of individual elements–multipoles, namely the power supply with the battery, inverter voltage (cathode and anode of valve group), transformers and induction motor. The way connection between the external branches of individual elements–multipoles mathematically described of matrices connections that draw up for each item on the principle: the number of rows equal number of independent units of the scheme and the number of columns equal to the number of external branches of element. Calculating implemented by language of FORTRAN. Common routines designed to perform mathematical operations on matrices; numerical integration of differential equations by the Runge–Kutta 2nd order; solution systems of algebraic equations by Gauss; definition moment of natural closing valves. The results of modeling the direct start induction motor from the network , the stator current; rotor's angular velocity and electromagnetic torque and moment loads was set. The calculation results confirmed those of experimental studies, almost identical curves of current and voltage induction motor from the network and independent source of battery at start–up and operation of the pump, the shape of the output voltage source and a pressure of pump during continuous operation of the electric pump.