ABSTRACT
The objective of controller performance monitoring (CPM) is to develop and implement technology that provides information to plant personnel for determining if appropriate performance targets and response characteristics are being met by the controlled process variables. Typical operating targets include limits on deviation from the set-point, limits on manipulated variable moves, variances of controlled and manipulated variables, frequency of soft constraint violations and frequency of reaching hard constraints. These targets can be used as criteria for assessing controller performance. Additional criteria are developed by considering the dynamic response characteristics such as decay ratio, overshoot, response time and response characteristics of the output error and the manipulated variable. Several additional criteria are defined for multivariable systems including the extent of dynamic interactions and loop shaping. Many of these criteria may not be automated easily and various techniques that can compute indexes indicating controller performance have been proposed.
