Challenging control problems and emerging technologies in enterprise optimization

As the scale of control systems increases from individual model predictive control (MPC) applications to integrated control systems for enterprise optimization, two challenges arise. First, the classic MPC regulatory control formulation is not always sufficient-the multivariable controller needs to be more than a regulator. Second, dynamic coordination among MPC controllers is a key to tight integration between advanced process control and plantwide optimization. The first half of this paper discusses the common control needs in the process industries and proposes a range control solution. The balance of the paper discusses the needs and complexity of the dynamic coordination problem, and proposes a three-tier integration method. Because enterprise optimization is a relatively new endeavor, this paper focuses on problems and issues, as well as solutions. The problems and proposed solutions are intended to stimulate discussion and attract more research interest. (C) 2003 Published by Elsevier Science Ltd.