DEVELOPMENT OF A METHOD TO OPTIMIZE THE CONTROL CHANNEL FLOW CHARACTERISTIC IN A CONTROL SYSTEM

Abstract

The PURPOSE of the paper is to improve the efficiency of technological equipment in a wide range of loads by optimizing the characteristics of control valves in automatic control systems. METHODS. The usual method for valve characteristics optimization is the method of re-profiling the control valves or the method of nonlinear coupling introduction. The main disadvantage of these methods is the need for design transformations of actuators and inability of adjustment for all operation modes. It is proposed to improve algorithmically the characteristics of control valves in real time. RESULTS AND THEIR DISCUSSION. The effect of hydraulic system features on the operation of control systems is studied on example of a multiple connected automatic control systems (ACS). Input data are obtained as a result of processing the archive of the automated process control system (APCS) of the PGU-450 power unit. The method of the algorithmic correction of the nonlinearity of the flow characteristics of control valves consists in the correction of the regulator’s control signal sent to the actuator in order to displace it further by a value whose magnitude is determined by the reference characteristic discrepancy. CONCLUSIONS. It is shown that being implemented, the proposed method improves the operation quality of automatic control systems. The method can be applied for any type of throttle valves. It means that correction is introduced in the structure of the automatic control circuit between the regulator and the block of digital-impulse conversion, which sends the control signal to devices engaged in reverse control of electric motors rather than the design of the control valve.