Performance comparison of paper machine stock concentration controllers

A simulation has been conducted to compare the performance of a number of possible different control schemes for stock concentration control of the Tasman Pulp and Paper mill second paper machine. Six different measurement schemes for each of four different control strategies have been considered. In comparing the four control strategies, it has been found that optimum multivariable controllers have performance superior to that of three term controllers, in regulating the furnish s.c. Three-term controllers have their structure determined optimally by the plant model and are thus better fitted to the actual plant.