Metodologia de sistema de controle robusto a falhas via LMI com realimentação dos estados

Abstract

The theory of robust control system started through the finding that, in practical conditions, the plant behavior may change over time. These modeling errors, mentioned as disturbances, appear due to ignored variables, constructive variations or even due to sensors and actuators failures. The plant variation causes the system to lose its characteristics, becoming unstable. This paper proposes a failure robust control methodology and, in computer applications, an actuator failure is considered. The methodology applied is the theorem of LMIs (Linear Matrix Inequalities) and the guarantee cost of -norm, as performance criteria. The analyzed control system has a states feedback controller and a direct net controller , in order to ensure the stability and tracking, even when failures are present in the plant. To illustrate the feasibility and the potential of the developed robust control system, a DC-DC Boost converter is used, considering actuator failure. In the next stage of this research, an instable plant will be also used, to verify the performance of the proposed methodology. In this case, the unstable plant it’s interesting because the performance of that kind of plant is most affected by failures.