CASCADED CONTROL OF AN AVERAGE VALUE OF A PROCESS PARAMETER TO A DESIRED VALUE

摘要

A multi-tier controller (610) directs operation of a system (620) performing a process. The process has multiple process parameters (MPPs) (625), at least one of the MPPs (625) being a controllable process parameter (CTPP) (615) and one of the MPPs (625) being a targeted process parameter (TPP) (625). The process also has a defined target limit (DTV) representing a first limit on an actual average value (AAV) of the TPP (625) over a defined time period of length TPL<sub