JPH02238501A - Calculating device for start/stop schedule of plant - Google Patents

Abstract

PURPOSE:To calculate a start/stop schedule with high accuracy by updating the plant characteristic data into the plant characteristic curve data coincident with the plane characteristics set at the calculating time point based on the plane operating result history data. CONSTITUTION:A history data collecting/recording device 9 collects the plant operation start/stop result history data from a plant 2 and records them. A result data extracting/recording device 10 extracts the plant operation result data equivalent to the plant characteristic curve data used for the plant start/ stop schedule calculation out of the recorded history data and records the extracted data. A standard data selecting/recording device 11 selects only the standard operation result data among those extracted by the device 10 and records the selected data. Then a plant characteristic data calculating device 12 calculates the plant characteristic curve data for calculation of the plant start/stop schedule and updates the plant characteristic curve data recorded into a plant characteristic recording device 3. Thus it is possible to always calculate the plant start/stop schedule with use of the plant characteristic curve data coincident with the actual plant characteristics set at the relevant time point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a plant startup/shutdown schedule calculation device in a plant operation automation system for a thermal/atomic power plant.

(Prior Art) As shown in FIG. 9, a conventional schedule calculation device 1 includes a plant characteristic recording device 3 having plant characteristic curve data for calculating start/stop schedule calls for plan i-2.
and a schedule calculation mechanism 5 which inputs plant characteristic curve data from the plant characteristic recording device 3 and inputs plant data 4 from the plant 2 to calculate the operation schedule of the plant 2 prior to the time of pruning. It will be done. For the plant characteristic curve data recorded in the characteristic recording device 3 for plan 1, data having a predetermined constant value is used.

In order to calculate the plant start/stop schedule in this schedule calculation device 1, the current value data of the plant 2 inputted from the plant 2 is inputted as the plant data 4, and the plant characteristic curve data in the plant characteristic recording device 3 is used. Plant 2 before the calculation execution time
By predicting the state of the vehicle and the time required for driving operations, the driving schedule of Plan 1 beyond the time of calculation execution is calculated.

(Problem to be Solved by the Invention) Conventionally, the plan 1 characteristic curve data stored in the characteristic recording device 3 for plan 1 uses a constant value set in advance. This plant special bamboo curve data is Bran 1
-2 design values and test run result data, but if the number of test runs is insufficient or the plant
In cases such as when characteristics change over time, the difference between the plant characteristic curve data stored in the plant characteristic recording device 3 and the actual characteristics of plans 1 and 2 at the time of calculation becomes large, resulting in schedule calls. This will reduce the accuracy of the sword. In other words, a problem arises in that the error between the schedule calculation results and the actual operating results of the plant increases.

The present invention has been made in consideration of the above-mentioned circumstances, and by recording plant operation history data and calculating and updating plant characteristic curve data used for schedule calculation based on the data, the present invention is constantly updated. The purpose of this study is to calculate a plant start-up/shutdown schedule that can be calculated by calculating a high-quality melon schedule using plant characteristic curve data that matches the actual plant characteristics at a given time.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a plant characteristic recording device having plant characteristic curve data for calculating a plant startup/shutdown schedule, and inputting the characteristic curve data from this plant characteristic recording device into Plan 1. A plant startup/shutdown schedule call calculation device that is equipped with a schedule calculator that calculates plant operation schedule calls beyond the time of calculation by inputting plant data from plan j~ collects historical data of plant startup/shutdown results. A historical data collection and recording device that records the data, and from the historical data recorded in this historical data collection and recording device, extracts and records plant operation performance data that corresponds to the plant characteristic force data used for calculating the plant startup and shutdown schedule. A standard data selection and recording device that selects and records only standard driving performance data from the driving performance data recorded in this performance data extraction and recording device, and a standard data selection and recording device that selects and records only standard driving performance data from the driving performance data recorded in this performance data extraction and recording device. and a plant characteristic data calculation device that calculates plant characteristic curve data for calculating a plant start-up/shutdown schedule from the standard data obtained and updates the plant characteristic curve data provided in the plant characteristic recording device. .

(Operation) The historical data collection and recording device from the plant collects and records historical data of plant start-up and stop results. Extraction of performance data from recorded history data The recording device extracts and records plant operation performance data that corresponds to the plant characteristic curve data used to calculate the startup/shutdown schedule, and selects and records standard data from the operation performance data. The device selects and records only standard operational performance data.

The plant characteristic data subtraction device calculates the plant characteristic curve data for calculating the plant start/stop schedule from the standard data, and updates the plant characteristic curve data stored in the plant characteristic recording device. Therefore, the schedule calculation mechanism The plant start-stop schedule 81 always uses plant characteristic curve data that matches the actual plant characteristics at that time.
It is possible to perform calculations and provide schedule calculation results with extremely high accuracy.

(Embodiment) An embodiment of the plant startup/shutdown schedule J1 calculation device according to the present invention will be described with reference to the accompanying drawings. In this example, among the plant characteristic curve data used for schedule calculation, the plant state fluctuation is modeled as the output signal of the first-order lag system such as metal temperature cooling, rise curve, condenser vacuum rise curve, etc. This will be explained using a time change curve as an example.

As shown in FIG. 1, the startup/stop schedule calculation device is a conventional schedule calculation device 1 with a schedule calculation data updating device 7 added thereto. The conventional schedule call calculation system @1 is the same as the case shown in FIG. 9, so a redundant explanation will be omitted.

The schedule calculation data update device 7 includes a history data collection and recording device that collects and records historical data on start and stop results of the plant 2 as plant operation data 8, and history data recorded in the history data collection and recording device 9. A performance data extraction and recording device 10 that extracts and records operational performance data of the plant 2 corresponding to plant characteristic curve data used for calculating the start/stop schedule of the plant 2 from A standard data selection and recording device 11 selects and records only standard operation performance data from the data, and a plant characteristic curve for calculating start/shutdown schedule calls of the plant 2 from the standard data. A plant characteristic data h4 calculating device 12 is provided which calculates the data and updates the plant characteristic curve data provided in the plant characteristic recording device 3.

The waist history data collection and recording device 9 includes a plant operation data overnight collection device 1 that collects plant operation data 8 from the plant 2.
3, and a history data recording device 14 for recording history data collected by the plant operation data collection device 13.

Historical data recording device 1 is included in the performance data extraction recording device @10.
A performance data extraction device 15 that searches and extracts the operation performance data of Bran 1-2 corresponding to the plan 1 and characteristic curve data used for schedule calculation from 4, and the performance data extracted by this performance data extraction device 15. A performance data recording device 16 for recording is provided.

As shown in FIG. 2, the performance data extraction device 15 includes a data search unit 15a that searches the history data recording device 14 for plant operation history data used for calculating and updating plant characteristic curve data for schedule calculation, and and a feature parameter extraction unit 15b that calculates a time constant parameter characterizing the first-order lag time change pattern.

In other words, the data search unit 15a searches the plant state quantity corresponding to the plant characteristic curve data used for the schedule 51 calculation from among the operating history f of the plant 2 recorded in the historical data recording device 14. Search and input the time width data to be used as a curve. Taking the condenser vacuum rise curve for schedule calculation as an example, the condenser vacuum degree is searched in the range from the time when the vacuum starts to rise to the time when the rated empty air value is reached. An example of the retrieved data is shown in FIG.

Next, the characteristic parameter extraction unit 15b calculates a time constant of the first-order lag system as a parameter characterizing the above-mentioned retrieved plant data. The plant state quantity P(t) at time t can be expressed by the following equation.

P = P C1-e"(L-'O))...-(1
)(t) c P: Plan l - Final value of state quantity change C T Time constant of plant state quantity change to: Start time of plant state quantity change Time constant d specifies a certain time 1-1 within the data search interval Then, using the value P1 of the plant-like 9M at this time, (1)
From the formula, it can be calculated as follows.

[Margins below] (2) The plant operation history data searched by the data search unit 15a is operation data of past plant startups and stops;
Estimation processing similar to the above equations (1) and (2) is performed for multiple times in the past, and the time constant T . T,
、． T3. ... is obtained, and the performance data recording device 16
to be recorded.

The standard data selection recording device 11 stores information about exceptional plant operations among the operation performance data recorded in the performance data recording device 16 (for example, normal operation and unnecessary operation due to tests or equipment troubles). a standard data selection device 17 that deletes the data corresponding to the standard driving pattern) and selects and inputs data corresponding to the standard driving pattern; and a standard data recording device that records the standard data selected by the standard data selection device 17. 18 are provided. The standard data selection device 17 includes a threshold calculation unit 17a that calculates a threshold value for determining whether or not to use the sample of parameters calculated by the feature parameter extraction unit 15b in subsequent calculations. , and a data selection section 17b that selects a sample of parameters using the threshold value calculated by the threshold calculation section 17a.

That is, the threshold value calculation unit 17a calculates the characteristic parameters T1, T2 . For T3, . . . , threshold values are calculated to determine whether or not to use them in subsequent calculation processing. The threshold value may be, for example, T. T
．． T3. . . . has the distribution shown in FIG. 4, it is determined by one or two times the standard deviation around the average value. The data selection unit 17b also uses this threshold to select the characteristic parameters recorded in the performance data recording device 16, and records those within the range of the threshold in the standard data recording device 18 as standard data. do.

The plant characteristic data measuring device 12 uses the standard data recorded in the standard data recording device 18 to calculate and output the plant temporal change characteristic force used in the schedule calculation.
The plant characteristic curve data stored in the plant characteristic recording device 3 is updated to the latest data.
A representative parameter calculating section 12a calculates a parameter representative of the most standard change pattern using characteristic parameter samples recorded in the standard data recording device 1972, and generates plant characteristic curve data corresponding to this representative parameter. , and a plant characteristic data generation section 12b that updates the plant characteristic curve data stored in the plan 1/characteristic recording device 3.

That is, the representative parameter measuring unit 12a uses the standard data recorded in the standard data recording device 18 to delete the representative values (for example, average values) of the characteristic parameters of the driving history data, as shown in FIG. The plant characteristic data generation unit 12b generates standard curve data for the representative value, and sends this plan 1 characteristic curve data as a plant characteristic update data 19 to the plant characteristic recording device 3. Update the plant characteristic curve data stored in 3.

Next, the effect will be explained.

The plant operation data collection device 13 constantly collects the plant operation data 8 of the plant 2 and records it in the history data recording device 14 as history data. Since this historical data is raw plant data, the performance data extraction device 15
T-J between turbine trip and next turbine startup
When planning the schedule, plant characteristics information is used to predict the plant status beyond the calculation point and the time required for operation, such as the turbine metal temperature from the start of vacuum rise to the condenser vacuum level when the rated vacuum level is reached. Plant operation performance data related to the J-bu data is extracted and recorded in the performance data recording device 16.

Some of these performance data may include operation data that deviates from the normal standard operation pattern due to tests or equipment troubles, so the standard data selection device 17 selects operation data that corresponds to the standard operation pattern. Only the data to be used are selected and recorded on the standard data recording device 18.

Plant characteristic data ■ The calculation system ffi 12 calculates plant characteristics data over time for schedule calculation using the standard data recorded in the standard data recording device 18, and outputs the plant characteristics curve data in the plant characteristic recording device 3. will be updated with the latest calculation results.

In this way, the plant characteristic curve data stored in the plant characteristic recording device 3 is
Since this accurately matches the actual characteristics of the plant 2, by performing the schedule calculation using the schedule calculation mechanism 5, it is possible to provide extremely highly accurate startup/shutdown schedule calculation results.

Next, other embodiments of the present invention will be described.

The previous embodiment does not show a configuration example for the time change curve of plan 1 and state drunkenness, which can be approximated as an output signal of a first-order delayed system. Examples of plant operating characteristic parameters are shown below.

First, the data search section 15a searches and inputs driving history data in the same manner as in the embodiment described above. An example of clean-up time data for schedule calculation is not shown in FIG. In Figure 6, t8 indicates the time from the MFT time at the previous stop to the start of cleanup, and to indicates the time required for cleanup. Since it is given as a function (curve data) of the time until the start, the feature parameter extraction unit 1lb uses the cleanup start time t and the cleanup time t from the MFT as parameters that characterize the above-mentioned retrieved plant data. The operation history data retrieved by the data search unit 11a is the operation data at the time of past plant start-up, and by performing the same calculation process as above for multiple times in the past, each case is ? Calculate (tH?■, 1>, (both 1, 1, t3), ... CC shift.

Next, the threshold calculation unit 17a calculates a threshold value for the above string of feature parameters to determine whether or not to use it for subsequent calculation processing. For example, if the characteristic parameter sequence has a distribution not shown in Figure 7, the threshold value can be set by using the previously set cleanup time curve for schedule calculation as the center line, and moving it to a certain point from this center line. You can choose to use width data. The data selection section 17b selects data within this threshold value and records it on the standard data recording device 18.

Finally, the representative parameter calculation unit 12a uses the standard data in the standard data recording device 18 to calculate the correlation curve between t and tHFT with the minimum squareness as shown in FIG. C By calculating by multiplication, etc., this is used as a representative value, and this is used as standard data (for schedule calculation) and sent to the plant characteristic recording device 3 via the plant characteristic data generation section 12b to generate plant characteristic curve data. Update.

According to this embodiment, among the plant characteristic curve data for schedule calculation, various cleanup times can be updated to reflect plant operation data at all times. Even with changes in plant characteristics over time, schedule 4 accuracy can be maintained well.

(Effects of the Invention) The present invention provides a historical data collection and recording device that collects and records historical data of plant startup and shutdown records, and a plant startup and shutdown schedule reduction based on the historical data recorded in this historical data collection and recording device. A performance data extraction and recording device that extracts and records plant operation performance data corresponding to plant characteristic curve data used in A standard data selection recording device that selects and records standard data, and calculates plant characteristic curve data for calculating a plant startup/shutdown schedule from the standard data recorded in this standard data selection recording device, Since it is equipped with a plant characteristic data calculation device that updates the plant characteristic curve data, the plant characteristic curve data used for calculating the plant start-up and shutdown schedule can be used in cases where the initial settings are insufficiently accurate or the plant characteristics change over time. Even if the accuracy has deteriorated due to plant operation history data, it is possible to update the plant characteristic curve data to match the characteristics of Plan 1 at the time of calculation based on the plant operation history data. By using this method to perform schedule calculations, extremely highly accurate schedule calculation results can be provided.

[Brief explanation of drawings]

1 and 2 are block configuration diagrams showing one embodiment of a plant startup/shutdown schedule calculation device according to the present invention, and FIG. 3 is a characteristic diagram showing an example of plant operation history data in the above embodiment. Fig. 4 is a characteristic diagram showing the distribution of characteristic parameters of driving history data and the range of data adoption in the above embodiment, Fig. 5 is a characteristic diagram showing representative values of characteristic parameters of driving history data in the above embodiment, and Fig. 6 7 is a characteristic diagram showing the plant operation history data according to another embodiment of the present invention. FIG. 8 is a characteristic diagram showing representative values of characteristic parameters of driving history data in another embodiment of the present invention,
FIG. 9 is a block diagram showing a conventional schedule calculation device. 1... Schedule calculation device, 2... Plant, 3
...Plant characteristic recording device, 4.Plant data, 5.Schedule calculation mechanism, 7.Schedule calculation data update device, 8.Plant operation data, 9.Historical data collection record. Device, 10...Actual data extraction recording device, 11...Standard data selection recording device, 12...Plant characteristic data calculation device 4, 19...
Plant characteristics update data. Diagram

Claims (1)

[Claims] A plant characteristic recording device having plant characteristic curve data for calculating a plant start-up/shutdown schedule, inputting plant characteristic curve data from this plant characteristic recording device, inputting plant data from the plant,
A plant startup/shutdown schedule calculation device equipped with a schedule calculation mechanism that calculates a plant operation schedule beyond the time of calculation includes a historical data collection and recording device that collects and records historical data of plant startup/shutdown records; A performance data extraction and recording device that extracts and records plant operation performance data corresponding to plant characteristic curve data used for calculating plant startup/shutdown schedules from the history data recorded in the history data collection and recording device, and this performance data extraction record. A standard data selection recording device that selects and records only standard operation performance data from the operation performance data recorded in the device, and a standard data selection recording device that selects and records only standard operation performance data from the operation performance data recorded in the device, and a A plant start/shutdown schedule calculation device comprising: a plant characteristic data calculation device that calculates plant characteristic curve data and updates the plant characteristic curve data provided in the plant characteristic recording device.