JP4834580B2 - Plant condition index management device and computer program for its implementation - Google Patents

Description

  The present invention relates to a processing technique for process data collected from a plant, and more particularly to a plant state index management apparatus that manages a process data stable state index indicating that the process data is in a stable state.

  In general, in a plant such as a nuclear power plant, process data indicating the process amount of the plant is periodically collected in order to grasp the operation status of the plant main body and plant component equipment. At this time, in order to properly perform plant performance evaluation and soundness confirmation, it is important to determine whether the process data is at the time of plant stability or at the time of plant instability. . That is, when collecting process data, it is necessary to collect process data (static characteristics data) during plant settling in a steady state in a pioneer.

  Therefore, a technique for automatically evaluating collected process data and automatically extracting only process data in a stable state is disclosed. Specifically, with respect to process data, upper and lower limit range widths that are regarded as being in a stable state are determined in advance, and only process data that moves within the range is collected. Then, when the process value of the process data deviates from the range width, a technique is adopted in which the stable state of the process data is reset.

  As an index for determining the stable state of the process data, in a power plant, when monitoring the state that the plant is in a thermal equilibrium state, the process data is obtained by monitoring the fluctuation state of the generator output (MW). Some have determined whether or not they are in a stable state. For example, in the technology described in Patent Document 1, four load bands, 100% load, 75% load, 50% load, and 25% load, are set, and the upper and lower limit range widths of process values in each load band are determined in advance. The process data is checked for stability by checking whether the process value is within the range. The stable state of plant data is usually monitored online.

  In the technique described in Patent Document 2, any one process data is extracted as representative process data of each group from two or more process data of each group determined to be in the same steady state. Thinning out other process data. According to such a technique, it is possible to improve the processing efficiency with respect to the process data evaluation process and the static characteristic data extraction process.

Japanese Patent Publication No. 8-16618 JP 2000-311012 A

  As described above, conventionally, when determining the stable state of process data, the upper and lower limit range widths of process values of process data are first determined. For this reason, if the process value of the process data fluctuates in the vicinity of the upper and lower limits of the range width and slightly deviates from the range width, the process data is regarded as not in a stable state and is not collected.

  However, even if a process value of certain process data deviates from a predetermined range width, depending on the process value, there is a case where the process data is regarded as being in a stable state and desired to be collected. Specifically, this is the case when there is little fluctuation near the upper and lower limits of the range width. However, in the prior art, process data whose process values deviate from the upper and lower limits of the range width are regarded as an unstable state without exception and are not collected.

  Moreover, as already stated, monitoring of the stable state of plant data is usually performed online. Therefore, if a failure occurs online due to some reason, the process data collection itself is not performed at all, and the stable state cannot be determined. Therefore, development of a technique for reliably determining the stable state of process data has been awaited even when a failure occurs online.

  Incidentally, it goes without saying that rapid and highly accurate data analysis is desirable for plant thermal efficiency analysis and equipment degradation prediction analysis. As described above, in data analysis, data management such as searching for another process data using a process condition as a search condition is effective. However, conventionally, a history of determination results as to whether or not the process data is in a stable state has not been stored. Therefore, a technique for grasping the stable state of process data as an index, managing the process data stable state index, and widely using it for data management has been demanded.

  The present invention has been made in response to such a conventional situation, and determines the stable state of the process data in consideration of the case where the process value of the process data fluctuates near the upper and lower limits of a predetermined range width. Moreover, the process data can be determined appropriately and efficiently by determining the stable state of the process data stored not only online but also offline even when offline, and by searching for another process data using the stable state of the process data as a search condition. An object of the present invention is to provide a plant state index management device that can be managed and contributes to improving the efficiency of plant performance evaluation and soundness confirmation.

In order to achieve the above object, the present invention provides a process data collection means for collecting process data from a plant in a plant condition index management apparatus for managing a stable condition index in process data from a plant, and the process data A process data storage unit that stores the process data collected by the collection unit, a process data stable state determination condition storage unit that stores a determination condition for determining that the process data is in a stable state, and the process data storage unit Process data stable state determination means for determining whether or not the process data is in a stable state based on the determination conditions stored in the process data stable state determination condition storage means, and the process data The stable state determination means determines that the state is stable. It has a process data stable state index storage means for storing the stable state indication of the process data, and a process data retrieval means for retrieving process data stored in the process data storage means. In addition, when the process data stable state index is stored in the process data stable state index storage unit, the process data search unit stores the process data storage unit using the stored process data stable state index as a search condition. In the case where the process data stable state index is not stored in the process data stable state index storage means, in addition to the search period specified by the process data search means, the process data stable state is searched. For the specified time required to determine the process, the search is performed using the condition for determining the stable state of the process data as a search condition, and the process data stable state index is determined based on the search result for this specified period. Based on the processed process data stability indicator. Is characterized in that to search for process data search period Sesudeta retrieval means has specified. A program for realizing the plant state index management device on a computer is also an aspect of the present invention.

  According to the present invention, the stable state of the process data is determined in consideration of the case where the process value of the process data fluctuates near the upper and lower limits of the predetermined range width. As for the contacted process data, if the difference between the process values is within a predetermined fluctuation range, the process data can be collected as a stable state, and the process data can be managed appropriately and efficiently. .

(1) First Embodiment [Configuration]
Hereinafter, typical embodiments according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a configuration diagram of the first embodiment, and FIG. 2 is an explanatory diagram of process data stable state determination processing in the first embodiment. In addition, in the following embodiment, the same code | symbol is attached | subjected regarding the same member.

  The configuration of the first embodiment will be described with reference to FIG. The first embodiment is a plant state index management device that manages an index of the stable state of process data from the power plant 12, and includes a process data collection unit 1, a process data stable state online determination unit 4, It consists of the following four files: a process data current value file 2, a process data history recording file 3, a process data stable state determination condition file 5, and a process data stable state index history recording file 6.

  The process data collection unit 1 is a part that collects process data from the power plant 12 at a constant period. The process data current value file 2 is a part for storing the latest values of the process data collected by the process data collecting means 1. The process data history recording file 3 is a part for storing process data collected by the process data collecting unit 1 as history data at a constant cycle in a long time series.

Table 1 shows a format example of the process data history recording file 3.

Table 2 below shows a configuration example of the process data stable state determination condition file 5. Here, the following two values are set as determination conditions stored in the file 5. That is, the allowable range regarding the absolute value of the difference between the process value of the process data sampled last time and the process value of the process data sampled this time, and the minimum condition of the process value are set.

  The process data stable state online determination means 4 monitors the process data updated in the process data current value file 2 online, and the process data is stabilized based on the determination conditions stored in the process data stable state determination condition file 5. It is a part for determining whether or not it is in a state.

  More specifically, as shown in FIG. 2, the process data stable state online determination means 4 is based on the determination condition stored in the process data stable state determination condition file 5, and the process value of the previously sampled process data, that is, the previous sampling If the absolute value of the difference between the value [t (n-1)] and the process value of the process data sampled this time, that is, the current sampled value [t (n)] is within the allowable range shown in Table 1, the process is performed. The data stable state index is set to ON, and the process data stable state index is set to OFF when deviating from the allowable range.

  Further, in the process data, if the minimum value of the process value is less than the minimum condition set in the process data stable state determination condition file 5, even if the process value is within the allowable range, the process data stable state The online determination means 4 is adapted to turn off the process data stable state index.

  The process data stable state index history recording file 6 is a part that stores the process data stable state index, which is the determination result of the process data stable state online determination unit 4, as history data. When the process data stable state index is stored in the process data stable state index history recording file 6, a pattern for recording the process data stable state index at a certain period as shown in Table 3 and a process data as shown in Table 4 are shown. The pattern to be recorded can be taken only when the stable state index is set and reset, and the recording method can be switched as necessary.

[Function and effect]
The operational effects of the first embodiment are as follows. First, the operation of this embodiment will be described. When the process data collection unit 1 collects process data from the power plant 12 at a fixed period, the process data current value file 2 stores the latest value of the process data collected by the process data collection unit 1 and the process data history recording file 3 The process data collected by the process data collecting means 1 is stored in a time series as long-term history data at a constant cycle.

  The process data stable state online determination means 4 monitors the process data updated in the process data current value file 2 online, and when determining that the process value of the process data is stable, the process value of the process data sampled last time The absolute value of the difference between [t (n−1)] and the process value [t (n)] of the process data sampled this time is within the allowable range of the process data stable state determination condition file 5 shown in Table 1. If the minimum condition is satisfied, the process data stable state index is set to ON. On the other hand, the process data stable state index is turned OFF when the tolerance is deviated or the minimum condition is not satisfied.

  Specifically, when the previous sampling value is 145, the current sampling value is 147, and the allowable range is 2.5, the absolute value of the difference between the previous sampling value and the current sampling value is 2, which is the allowable range. Since it is within 2.5, if the minimum value of the process value clears the minimum condition, the process data stable state index is ON.

  As described above, since the process data stable state determination condition file 5 adds the minimum process value condition as the process data stable state determination condition, the process data process value should be equal to or lower than the minimum condition. For example, the process data stable state index is immediately turned OFF, and even if the absolute value of the difference between adjacent process values is within the set allowable range, process data having such a process value is regarded as being in a stable state. I do not consider it.

  The process data stable state index determined by the process data stable state online determining means 4 is stored as history data in the process data stable state index history recording file 6. At this time, the process data stable state index is recorded at a fixed period, or is recorded only when the process data stable state index is set and reset (see Tables 3 and 4 above).

  According to the first embodiment described above, the absolute value of the difference between the previous sampled value [t (n−1)] and the current sampled value [t (n)] in the process data stable state online determination unit 4 is predetermined. Whether or not the process data is in a stable state is determined by whether it is within the allowable range, so even if the process data is in the vicinity of the upper and lower limit range, the fluctuation range of the difference between the current sampling and the current sampling is within the allowable range. If present, this process data can be regarded as a stable state. Further, data collection can be continued even when process data collection is performed only when the process data stable state index is ON. Thereby, process data can be managed appropriately and efficiently.

(2) Second Embodiment [Configuration]
Next, a second embodiment of the plant state index management device according to the present invention will be described with reference to FIG. FIG. 3 is an explanatory diagram of a process data stable state determination process according to the second embodiment. The basic configuration of the second embodiment is the same as that of the first embodiment shown in FIG.

  The structural features of the second embodiment are as follows. That is, when the process data stable state online determination means 4 determines that the process value of the process data is stable, as shown in FIG. 3, the absolute value of the difference between the maximum value and the minimum value within the specified time within the specified time is If it is within the allowable range of the process data stable state determination condition file 5, the process data stable state index is set to ON, and if it deviates from the allowable range, the process data stable state index is set to OFF.

Table 5 is a configuration example of the process data stable state determination condition file 5 in the present embodiment.

  The process data stable state determination condition file 5 is used in the same manner as described in the first embodiment. However, as shown in Table 5, the process data is set as the stable state as the determination condition parameter. The feature of the second embodiment is that a prescribed time to be considered is given. The process data stable state index is stored and recorded as history data in the process data stable state index history recording file 6 as in the first embodiment.

[Function and effect]
In the second embodiment having the above configuration, whether the absolute value of the difference between the maximum value and the minimum value within the specified time is within the allowable range or deviates from the allowable range in the process data stable state online determination unit 4. Thus, the stable state of the process data is determined. For this reason, even if the process value is touched near the upper and lower limit range, if the absolute value of the difference between the maximum and minimum values within the specified time does not exceed the allowable range, the process data may be considered to be in a stable state. Is possible.

  By the way, when there is a drift of process data, it is often more appropriate to consider the process data as unstable. However, in the first embodiment, the determination condition is that the absolute value of the difference between the previous sampling value [t (n−1)] and the current sampling value [t (n)] falls within the allowable range. When the process data drifts slowly even though the process data is drifted and the process data is more appropriately determined to be an unstable state, the previous sampling value [t (n−1)] Since the difference between the sampling value [t (n)] and the current sampling value is small, the absolute value is within the allowable range, and this process data is determined to be in a stable state.

  On the other hand, in the second embodiment, whether the absolute value of the difference between the maximum value and the minimum value within the specified time is within the allowable range, not the difference between the previous and current sampling values, It has become. For this reason, even if the drift of the process data is slow, if the absolute value of the difference between the maximum value and the minimum value within the specified time increases, such process data can be determined to be in an unstable state. Is possible. Therefore, there is an advantage that the stable state determination of the process data suitable for the practical requirement can be performed, and the process data can be processed more accurately.

(3) Third Embodiment [Configuration]
Next, a third embodiment of the plant state index management device according to the present invention will be described with reference to FIG. FIG. 4 is an explanatory diagram of process data stable state determination processing according to the third embodiment. The basic configuration of the third embodiment is the same as that of the first embodiment shown in FIG. 1, except that the process data stable state online determination means 4 is configured as follows. There are features.

  That is, when the process data stable state online determination means 4 determines that the process data is in a stable state, an average value within a specified time for the past n times is calculated, and the process data stable state determination condition file 5 is based on the average value. The range taking into account the allowable range is set as the upper and lower limit range, and if the current value is within that range, the process data stable state index is turned ON, and if it deviates from the allowable range, the process data stable state index is turned OFF. (See FIG. 4).

  In the third embodiment, the process data stable state determination condition file 5 is configured as shown in Table 6. The method of using the process data stable state determination condition file 5 is the same as that described in the first embodiment, but a ratio based on an average value within a specified time may be set as an allowable range. However, you may specify an absolute value.

[Function and effect]
The calculation method of the upper and lower limit range in the process data stable state online determination unit 4 of the third embodiment is as follows. Here, when the allowable range is 10% and the average value within the specified time is 100, the upper and lower limit values are calculated as follows.
Upper limit value: 100+ (100 × (10/100) × (1/2)) = 105
Lower limit: 100− (100 × (10/100) × (1/2)) = 95

When the allowable range is 5 and the average value within the specified time is 100, the upper and lower limit values are calculated as follows.
Upper limit value: 100 + 5 = 105
Lower limit: 100-5 = 95

  According to the third embodiment described above, the process data stable state online determination means 4 calculates an average value within a specified time, and takes into account the allowable range of the process data stable state determination condition file 5 on the basis of the average value. Whether or not the process data is in a stable state is determined based on whether or not the current value is within the calculated upper and lower limit range. For this reason, even if the process value is touched in the vicinity of the upper / lower limit range, the process data can be regarded as being in a stable state as long as the current value is within the upper / lower limit range. Therefore, the process data can be properly managed as in the first and second embodiments.

(4) Fourth Embodiment [Configuration]
With reference to FIG. 5, 4th Embodiment of the plant condition parameter | index management apparatus concerning this invention is described. In the fourth embodiment, a process data stable state offline determination unit 7 and a process data stable state determination manual request unit 8 are added to the first embodiment shown in FIG.

  The process data stable state offline determination means 7 is a part for determining offline whether the process data is in a stable state based on the process data stable state determination condition file 5 and the process data history recording file 3. The process data stable state determination manual request unit 8 is a unit for arbitrarily starting the process data stable state offline determination unit 7. Other configurations are the same as those in the first embodiment, and thus are omitted.

[Function and effect]
The operation of the fourth embodiment having the above-described configuration is as follows. The process data stable state determination manual request means 8 sets the start date and time and the end date and time for acquiring data necessary for determining the process data stable state offline from the process data history recording file 3, and the process data stable state The offline determination means 7 is activated.

  The process data stable state offline determination means 7 records the process data history based on the start date and time and the end date and time set by the process data stable state determination manual request means 8 and the information set in the process data stable state determination condition file 5. Necessary process data is retrieved from the file 3, whether or not the retrieved process data is stable is determined at the time of an arbitrary request, and the determination result is retroactively updated to the process data stable state index history recording file 6. .

  According to the fourth embodiment as described above, the process data stable state offline determination means 7 can determine the process data stable state off-line at an arbitrary request instead of online monitoring. For this reason, even if the online process data stability status cannot be monitored for some reason, the necessary process data is arbitrarily searched from the history-recorded process data history recording file 3, and the search result is used as a basis. The stable state determination of process data can be performed offline.

  Furthermore, the determination result by the process data stable state offline determination means 7 can be recorded in the process data stable state index history recording file 6 retroactively. In addition, by changing various parameters in the process data stable state determination condition file 6, it is possible to compare and examine the results determined online and the results determined offline, and fine data processing is possible.

(5) Fifth Embodiment [Configuration]
The configuration of the fifth embodiment according to the present invention is shown in FIG. That is, the fifth embodiment is characterized in that, in addition to the configuration of the fourth embodiment, a process data search means 9, a process data search condition file 10, and a process data display means 11 are provided. Since other configurations are the same as those in the first and fourth embodiments, the description thereof is omitted.

  The process data search means 9 stores the process data history record file 3 based on the process data stable condition index stored in the process data stable condition index record file 6 or the search condition recorded in the process data search condition file 10. This is the part to search the recorded process data. The process data display means 11 is a part that outputs the results searched by the process data search means 9 in various display formats.

  Tables 7 to 9 show configuration examples of the process data search condition file 10. In the process data search condition file 10 shown in Table 7, the process data stable state index recorded in the process data stable state index history recording file 6 is set as a search condition.

  In the process data search condition file 10 shown in Table 8, in addition to the process data stable state index, a search condition that a process value of a certain process data is within a specified range is designated by an AND or OR condition. .

  In the process data search condition file 10 shown in Table 9, a determination condition for determining the process data stable state index in the process data stable state offline determination unit 7 is set as a search condition.

[Function and effect]
The operation of the fifth embodiment having the above configuration will be described. By setting the process data stable state index recorded in the process data stable state index history recording file 6 as a search condition in the process data search condition file 10 as shown in Table 7, the process data search means 9 is stable. The process data when in the state can be extracted from the process data history recording file 3.

  Further, as shown in Table 8, in addition to the process data stable state index as a search condition, a process data search means is specified by specifying a condition that a certain process data is within a specified range by an AND or OR condition. 9 can extract the process data in a stable state from the history data recorded in the process data history recording file 3.

  The examples in Table 7 and Table 8 described above are methods for setting the process data stable state index recorded in the process data stable state index history recording file 6 as a search condition. On the other hand, the example of Table 9 shows a case where the process data stable state index history recording file 6 does not record the process data stable state index. That is, as shown in Table 9, a determination condition for the process data stable state offline determination means 7 to determine the process data stable state index is set in the process data search condition file 10, and this determination condition is set as the search condition. By doing so, even if the process data stable state index history is not stored in the process data stable state index history recording file 6, the process data in the stable state can be searched.

  Specifically, the process data search unit 9 reads the determination condition for determining the stable state set in the process data search condition file 10 and activates the process data stable state offline determination unit 7. The activated process data stable state offline determination means 7 searches for necessary process data from the process data history recording file 3 based on the conditions passed from the process data search means 9, and whether the searched process data is in a stable state. Determine whether or not.

  The process data determination result by the process data stable state offline determination means 7 is returned to the process data search means 9 with time, and the search specified in the process data search condition file 10 from the process data history recording file 3 at that time. By searching the target data, even if the process data stable state index is not stored in the process data stable state index history recording file 6, the process data in the stable state can be searched.

  As described above, according to the fifth embodiment, when it is desired to search for another process data using a certain process data in a stable state as a search condition, the process data stable state index recorded in the history is used as the search condition. Can be specified as For this reason, it is possible to extract process data only in a stable state from the process data history recording file 3, and it is possible to efficiently perform data collection for performing thermal efficiency analysis of a plant and predicting deterioration of equipment.

  Even if the process data stable state index is not stored in the process data stable state index history recording file 6, by adding a condition for determining the stable state of the process data as a search condition, It is also possible to determine the process data stable state index and search for process data only when the process data is stable based on the determination result. However, in this case, it is necessary to search for the specified time that is considered to be more stable than the set search period, and to search beyond the set search start date and time, but the process data history recording file is not noticed by the operator. The process data can be retrieved only when the stable state is from 3.

(6) Other Embodiments The present invention is not limited to the above-described embodiments, and the embodiments can be combined as appropriate, and the configuration of each unit can be changed as appropriate. For example, in the process data stable state determination condition file 5, a plurality of allowable ranges may be set, and by setting a plurality of allowable ranges, the level index value of the fluctuation range in the process value of the process data can be flexibly set. It is possible (± 5% is level 1, ± 3% is level 2, ± 1% is level 3, etc.). As a result, by specifying the range of the level index value in the specified conditions at the time of search, it becomes possible to specify the degree of stability and retrieve history data, and manage the stable state of process values at multiple levels (See Table 10 to Table 12).

  Further, the process data stable state determination process can be selected as appropriate. For example, in the third embodiment, when the process data stable state online determination unit 4 determines that the process value of the process data is in a stable state, an average value within a specified time for the past n times is calculated and used as a reference. In the third embodiment shown in FIG. 4, it is assumed that the current value is within the range, assuming that the range considering the allowable range of the process data stable state determination condition file 5 is the upper and lower limit range. The process data stable state index was turned on / off depending on whether or not the process data stable state index was turned on / off depending on whether the maximum value / minimum value within the specified time is within the range instead of the current value. An embodiment in which the above is determined is also included (see FIG. 7).

1 is a configuration diagram of a first embodiment according to the present invention. Explanatory drawing of the stable state determination process of the process data in 1st Embodiment. Explanatory drawing of the stable state determination process of the process data in 2nd Embodiment. Explanatory drawing of the stable state determination process of the process data in 3rd Embodiment. The block diagram of the 4th Embodiment which concerns on this invention. The block diagram of the 5th Embodiment which concerns on this invention. Explanatory drawing of the stable state determination process of the process data in other embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Process data collection means 2 ... Process data present value file 3 ... Process data history recording file 4 ... Process data stable state online determination means 5 ... Process data stable state judgment condition file 6 ... Process data stable state index history recording file 7 ... Process data stable state offline determination means 8 ... Process data stable state determination manual request means 9 ... Process data search means 10 ... Process data search condition file 11 ... Process data display means 12 ... Power plant

Claims (11)

In the plant state index management device that manages the index of the stable state in the process data from the plant,
Process data collection means for collecting process data from the plant;
Process data storage means for storing process data collected by the process data collection means;
Process data stable state determination condition storage means for storing determination conditions for determining that the process data is in a stable state;
Process data stable state determination for determining whether process data is in a stable state based on the determination condition stored in the process data stable state determination condition storage unit, using the process data stored in the process data storage unit as a determination target Means,
Process data stable state index storage means for storing a stable state index of process data determined to be in a stable state by the process data stable state determination means ;
Process data search means for searching for process data stored in the process data storage means,
The process data search means includes
When the process data stable state index is stored in the process data stable state index storage unit, the process data stored in the process data storage unit is searched using the stored process data stable state index as a search condition. ,
In the case where the process data stable state index is not stored in the process data stable state index storage means, in addition to the search period designated by the process data search means, the specified time required for determining the stable state of the process data , A search is performed using a condition for determining the stable state of the process data as a search condition, a process data stable state index is determined based on a search result for the specified period, and based on the determined process data stable state index A plant state index management apparatus for searching process data for a search period designated by the process data search means .   The plant state index management device according to claim 1, wherein the process data stable state determination unit is configured to monitor and determine the process data stored in the process data storage unit online.   The plant state index management apparatus according to claim 1, wherein the process data stable state determination unit is configured to search and determine process data stored in the process data storage unit offline.   The process data stable state determination means buffers the process data for a specified time, and stabilizes the process data depending on whether the absolute value of the difference between the maximum value and the minimum value in the process data is within the specified fluctuation range. The plant state index management device according to any one of claims 1 to 3, wherein the plant state index management device is configured to determine whether or not the state is acceptable. The process data stable state determination means determines whether the process data stable state is in accordance with whether or not the absolute value of the difference between the process value of the process data sampled last time and the process value of the process data sampled this time is within a predetermined fluctuation range. The plant state index management device according to any one of claims 1 to 3, wherein it is configured to determine whether or not it is possible. The process data stable state determination means calculates an average value of process values of the process data within a specified time, and sets the range considering the allowable range based on the average value as the upper and lower limit range, and the process value of the process data is The plant state index management device according to any one of claims 1 to 3, wherein the plant state index management device is configured to determine whether or not the stable state of the process data is within the range. It said process data stable state index storage means, the plant state index management apparatus according to any one of claims 1 to 6, characterized by being configured the process data stable state index to store periodically. 7. The process data stable state index storage means is configured to store the process data stable state index only when the stable state of the process data is set and reset. The plant state parameter | index management apparatus as described in any one. Said process data stable state index storage means, said time of storing the process data stable state index, any claim 1-8, characterized by being configured so as to level management stable degree by providing a plurality of defined variation range The plant state index management device according to claim 1. The process data search means includes
When the process data stable state index is stored in the process data stable state index storage means, the process data stable state index stored in the process data stable state index storage means and certain process data are within a specified range. 10. The plant state index management apparatus according to claim 1, wherein the process data stored in the process data storage unit is searched using an AND or OR search condition as a search condition. A process data collecting means for collecting process data from a plant, a process data storing means for storing the process data, and a process data stable state determining means for determining a stable state of the process data, and executing the process on a computer. In a computer program for realizing on a computer a plant state index management device for managing a stable state index in data,
Process data collection process to collect process data from the plant;
A process data storage process for storing the process data collected in the process data collection process;
A process data stable state determination condition storage process for storing a determination condition for determining that the process data is in a stable state;
Process data stable that determines whether process data is in a stable state based on the determination condition stored in the process data stable state determination condition storage process, based on the process data stored in the process data storage process State determination processing;
And process the data stable condition index storage process for storing the stable state indication of the process data it is determined that the stable state at the process data stable state determining process,
A process data search process for searching for process data stored in the process data storage process;
The process data search process includes :
When the process data stable state index is stored in the process data stable state index storing process, the process data stored in the process data storing process is searched using the stored process data stable state index as a search condition. ,
In the case where the process data stable state index is not stored in the process data stable state index storing process, in addition to the search period specified in the process data search process, a specified time required for determining the stable state of the process data The process data is searched using the condition for determining the stable state of the process data as a search condition, the process data stable state index is determined based on the search result for the specified period, and based on the determined process data stable state index And process data search for the search period specified in the process data search process.
A computer program for realizing a plant state index management apparatus characterized by causing a computer to execute the above processing.

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