シミュレータによる非線形システムの短時間同定法

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  • A Simulator-Based Quick Identification Method of Nonlinear Systems

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A method is proposed for identification of nonlinear systems. The method is primarily intended for model based failure diagnosis of large scale nonlinear plants.<br>A model of the plant to be identified is exploited as a simulator; the integrated squared output errors between the plant and the simulator over a short time interval is minimized by adjusting the simulator's parameters. The simulator parameters are adjusted iteratively, by small amounts at a time; in each iteration, linearization technique is applied and therefore there needs no distinguishment between linear and nonlinear plants. The initial state values are also included in the parameter vector to be adjusted; we can make the output error zero without waiting for the initial state response to decay and thus quick identification is possible. Still more important benifit is that the identifiability condition imposed on the plant input becomes weaker.<br>With these features, the proposed approach is called simulator-based approach to neat and quick system identification or SANQ system identification for short.<br>A simulation study of a feed water heating system failure diagnosis in a thermal power plant shows the validity of the method.

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