分散型エネルギーシステムにおける熱利用プロセスの動的補償を用いたモデルベース性能監視

概要

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A model-based performance monitoring method for a heat utilization process in a distributed energy system is developed in this study. This performance monitoring has three components: a static input-output model for the target process, a dynamic compensation function, and a failure detection function. First, the static input-output model estimates the values of output process variables in response to the variations in measured values of input process variables. Then, the dynamic characteristics of the output process variables are provided by the dynamic compensation where they are indentified as first order lag elements. Finally, the estimated values of the output process variables, which consider the dynamic characteristics, are compared with the measured values of the output process variables in order to detect device failures. Through a numerical simulation for a heat utilization process in a gas engine cogeneration system that has a radiator with a considerable lag characteristic, the effectiveness of the developed performance monitoring method in a dynamic state is verified. The result shows the sufficiency of the estimation accuracy of the output process variables and the capability of detecting device failures, including the deterioration in the heat transfer performance in the radiator and heat exchanger, in a dynamic state.