VARIANCE CONSTRAINED MODEL PREDICTIVE CONTROL AND APPLICATION IN LIFE EXTENDING CONTROL

Abstract

The objective of life extending control (LEC), also known as damage mitigating control, is to design a controller to achieve a good trade-off between structural durability and dynamic performance in a system. In this paper, continuum fatigue damage theory for a boiler-turbine system is discussed. To reduce the accumulated damage, a variance constrained model predictive control (VCMPC) problem is developed and an algorithm via linear matrix inequalities (LMIs) is derived. This algorithm is simpler than previous ones. The controller obtained by this algorithm can assign the resultant closed-loop poles in a prescribed region. Finally, we apply the algorithm in a boiler-turbine system.