ANTICIPATORY HIGH FREQUENCY NOISE COMPENSATION IN DISTRIBUTED PROCESS CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve the problem that a control system utilizing a low speed scan cycle is unable to compensate for high frequency process variations which have a duration less than the round-trip communications time between the controller developing the compensating control signal and the measurement device.;SOLUTION: A measurement device measures a process variable at a relatively high frequency and sends a subset of the measured data (eg. the low frequency data) to a standard controller. The standard controller generates a control signal to control the measured process parameter in any known manner. The modeling routine analyzes the high frequency data and develops a mathematical model of the high frequency noise within the process variable. The resulting mathematical model may then be used by a compensation routine to alter the control signal produced by the controller before that control signal is delivered to or used by the device being controlled.;COPYRIGHT: (C)2010,JPO&INPIT