Abstract:

As a key factor in model-based control technique, model fidelity has significant influence on control performance.Model-plant mismatch(MPM)is an important step in the procedure of control performance monitoring and system maintenance.A subspace-based MPM approach for control systems was proposed.First, the residual was constructed through subspace transformation.Then the residual was analyzed by using statistical local approach, from which an indicator could be constructed to detect the mismatch.Using orthogonal subspace, it was not needed to estimate system states and residual could be obtained only by using input and output data.Furthermore, based on the state space model, the proposed approach was suitable for MIMO process.The effectiveness of the proposed approach was illustrated by both simulation and industrial applications.