State-space model identification of continuous-time systems operating in closed-loop by using δ-operator model

摘要

This paper introduces a new identification method for estimating continuous-time state-space systems operating in closed-loop by using δ-operator model. First, based on the coprime representation of plants, we transform the closed-loop identification problem to an equivalent open-loop identification problem. Then we apply a δ-operator subspace identification method recently proposed in [1] to estimate the state-space model of the plant. A subsequent model reduction procedure is employed to obtain a lower-order approximation to the plant.