Kabushiki Kaisha Toshiba

Kensuke Kawai

Tsuneo Watanabe

Toshio Fujiwara

Keiko Ootani

Kazunori Ohmori

Takashi Kasai

Shigenobu Shirata

Miyako Negishi

A most recent value of data fetched from a plant facility is temporarily stored and extracted and then stored in a plant history data table. On another front, a monitoring point for monitoring a plant error is registered in response to an operator request. A monitoring point is used as a key to select and register a main variable point having a strong correlation from the plant history data table. A statistical upper/lower limit function is defined on the basis of time-series plant data of monitoring points and main variable points. By referring to information in a table in which a limit value function is stored, the limit value is periodically matched with the content of a plant-data most-recent-value table. If the most recent value is outside the limit range, deviation information is stored in a determination result table. If a new plant error occurs, an error signal and the content of the determination result table is outputted and displayed.

Plant operation data monitoring apparatus

Facility inspection support apparatus

In a method and a system for diagnosing a thermal power plant system including a thermal power plant, provided with an automatic power plant control system performing PID control, and a direct digital control system utilizing a control model representing the combination of the plant and the automatic power plant control system and controlling the plant to conduct an optimum control, the automatic power plant control system and the direct digital control system conducting control complementarily: a plant diagnostic model formed of a mathematical model representing the combination of the plant, the automatic power plant control system, the control model and the direct digital control system, is provided and used to determine predicted values of the plant variables; difference between the predicted value of each of the plant variables and the actual value of the same plant variable is determined, and stored thereby to provide a time series of the differences which have been successively determined; whiteness indexes used for testing the whiteness level of the time series of the differences are determined in accordance with the time series of the differences; judgement is made as to whether or not any of the plant variables is abnormal in accordance with the whiteness indexes; judgement is made as to whether or not any of the manipulated variables is faulty in accordance with the whiteness indexes and the result of judgement as to abnormality; and an alarm is outputted when an abnormality or a fault is detected.

System for determining abnormal plant operation based on whiteness

Growing community of inventors

Tokorozawa, Japan

Kensuke Kawai