摘要：AbstractIn this paper, we propose a design method of retrofit controllers for network systems in the presence of measurement noise. A retrofit controller is a local plug-in controller such that only the model of the subsystem of interest is required for controller design. A design procedure of retrofit controllers has been developed in previous work based on the technique called hierarchical state-space expansion with which the state of the original system can be represented by sum of the states of a cascaded system. We can design a retrofit controller by choosing a local controller that stabilizes and suppresses the state of the upstream part. However, the existing method cannot take account of measurement noise because the measurement noise is injected into the downstream part of the hierarchical representation and the cascade structure is lost by the noise. To tackle with this problem, we extend the hierarchical representation in which measurement noise is contained in the upstream part. With the proposed approach, the cascade structure is recovered and an effective controller that copes with measurement noise can be designed. The effectiveness of the proposed retrofit controller is verified through numerical examples of power systems.
关键词：KeywordsDistributed controlhierarchical controllarge-scale systemsnetworkspower systems
