JPS5941013A - Device for diagnosing plant operation - Google Patents

Abstract

PURPOSE:To detect a failed sequence item automatically for a short time by receiving and detecting an operation failure signal and comparing plant status with the failed status of a condition item table from data base information. CONSTITUTION:When an abnormality detecting part 23 in a microcomputer type sequence controller 2 detect the advance/stagnation of sequence, the device 2 transmits a trigger point indicating a system mode N0 causing the stagnation and the data of plant status including the failure status to a computer system 3 side through a data link 4. In the system 3, a failure checking part 3 detects the failure, an abnormality processing part 36 is started and the processing part 36 stores data from a data base 31 in a plant status saved area 34. A comparing part 37 selects the condition item table for the system mode No from a trigger point from a condition item table group 33 and compares the contents of the item table with the data stored in an area 34 to display an unconsistent item on an abnormal item display part 38.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a plant operation diagnostic device that is combined with a microcomputer-based sequence control device, and particularly includes means for investigating the cause of a control abnormality in the sequence control device. The present invention relates to a plant operation diagnostic device.

[Technical background of the invention and its problems]

Traditionally, wired logic type sequence control devices have been used for the sequence control part of control devices in thermal and nuclear power plants, but as the performance and reliability of microprocessors have improved, microcomputer type sequence control devices have become more popular. It is becoming widely used. This is largely due to the fact that the microcomputer sequence control device allows for easy changes in the control logic and is equipped with a self-diagnosis function, which can be expected to significantly improve reliability and maintainability.

However, although the expansion of the scope of application of this microcomputer-based sequence control device makes it possible to process complex sequence logic, the more complex the sequence logic is, the more likely it is that control abnormality will occur if some kind of control abnormality occurs during plant operation. Confirming the cause of the problem requires a great deal of effort and time from the operator. With conventional wired logic sequence control devices, it was possible to track down abnormal conditions by tracking the relay status (operation/non-operation). Therefore, the following methods are used to solve this problem.

(1) A means is provided on the sequence control device side to detect the cause of the control abnormality, and the results are displayed to the operator via a display means including a host computer.

(2) Information on the sequence control device side is transmitted to the host computer, the plant status is confirmed via the host computer, and the cause of the control abnormality is found from the state of the corresponding control logic.

However, in the case of (1) above, the functions of the sequence control device increase as the cause is found on the sequence control device side, and it is very impossible to cover all the causes of the abnormality. Therefore, only those that are particularly important are limited.

In the case of (2) above, it is necessary for the operator to make a decision to find the corresponding control logic condition according to the content of the abnormality and to investigate the cause from this content state. In particular, when a single cause causes a secondary or tertiary abnormality, all of them appear as abnormality cause items, so it is necessary to determine which of these is the true cause. Furthermore, if an emergency operation is performed in conjunction with the occurrence of a control abnormality, the plant status changes and data used to investigate the cause is also lost, which is a disadvantage.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned drawbacks of the conventional system, and it detects the occurrence of a control abnormality in a sequence control device, checks the corresponding plant status, detects the cause of the control abnormality, and promptly prompts the operator. The object of the present invention is to provide a plant operation diagnostic device that enables effective treatment.

[Summary of the invention]

The present invention consists of a sequence control device with a microcomputer as a component as a plant control device, and a control computer system that obtains process status information from the sequence control device through a data link. It is equipped with a condition item table expressing the contents, a means for inputting an abnormal operation signal from a sequence control device corresponding to this condition item table, and a database having input information of the plant status and abnormal signal of each item in the condition item table. By receiving and detecting an abnormal operation signal and comparing and comparing the plant status and the status of the condition item table from the database information, the sequence control device detects the cause of the progressive traffic jam and control abnormality that are causing the abnormal operation. It is characterized by

[Embodiments of the invention]

An embodiment of the present invention shown in FIGS. 1 to 3 will be described below. FIG. 1 is an overall configuration diagram of a plant operation diagnosis device according to the present invention. In FIG. 1, 1 is a thermal or nuclear power generation plant, 2 is a microcomputer sequence control device that performs sequence control of the power generation plant 1,
3 is a computer system data-linked to the microcomputer sequence control device 2; 4 is a data link connecting the microcomputer sequence control device 2 and the computer system 3.

21 to 24 show an example of a microcomputer type sequence control device 2, 21 is a control unit that inputs data from the plant, writes it to a database, and performs sequence control according to sequence logic; 22 is a database; 23 is an abnormality detecting section that detects an abnormality in the control section 22, and here also issues an emergency operation instruction according to the abnormal state. To prevent data from disappearing at this time, an interlock is included that issues an instruction when data transmission is completed in the event of an abnormality. 24 is a data transmission control unit that controls data transmission between the microcomputer sequence control device 2 and the computer system 3.

31 to 39 are parts of the computer system 3, 31 is a database, 32 is a data transmission control section that controls data transmission with the microcomputer sequence control device 2, and 33 is a sequence built into the control section 21. 34 is a plant state storage area that stores the plant state when an abnormality occurs; 35 is an abnormality check unit that checks whether the contents of the database 31 include an abnormal signal; 36 37 is an abnormality processing unit that is activated by the abnormality check unit 35 when the abnormality check unit 35 detects an abnormal signal representing sequence progress congestion, and stores it from the database 31 as plant state data at the time of occurrence of the abnormality in the plant state storage area 34; A comparison unit 38 is activated by the abnormality processing unit 36 and compares and matches the condition item table with the contents of the plant state storage area 34 to discover abnormal plant operation items that are causing sequence progress congestion. This is an abnormality item display section that displays plant-side operational abnormality items.

The operation of the plant operation diagnosis device of the present invention configured as shown in FIG. 1 will be explained. In sequence control in plant operation, the sequence logic is generally complex because the number of control operating terminals, the contents of the operations to be performed in series, and the timing of the operations vary widely. In such a complicated sequence logic, when a sequence progress jam occurs, the following method is used to detect the sequence logic item that causes the jam.

First, the series of logic flows of sequence control is divided into large parts, and each of these divisions is called a mode. The sequence control of this embodiment is divided into four modes: a certain operation command is given, and then based on this, start commands are given to the various operating terminals, the operation starts, and the operating state is reached. .

Next, the operating terminals that operate collectively in the sequence control of each mode described above are classified as a group. The operating terminals classified in this way appear many times in a series of sequence logics due to differences in their operation content, timing, and the like. Therefore, the sequence logic for each mode can be divided into small units of logic determined by specifying the classification and timing of the operating terminal. A number is assigned to this small unit of logic, and this number is called a system mode N0.

Now, in FIG. 1, in the microcomputer sequence control device 2, the abnormality detection section 23 checks the progress state. At this time, a trigger point is determined to indicate to which mode the logic that caused the sequence progress congestion belongs.

Include this in the transmission input (database). When the abnormality detection unit 23 detects sequence progress congestion, the microcomputer sequence control device 2 detects the system mode N causing the sequence progress congestion via the data link 4.
o. The plant state data including the trigger point indicating the abnormal state and the abnormal state is transmitted to the computer system 3 side. In the computer system 3, the abnormality check section 35 detects an abnormality and activates the abnormality processing section 36. The abnormality processing unit 36 stores data from the database 31 in the plant state storage area 34 . The comparison unit 37 determines the system mode No. from the trigger point. The condition item table corresponding to the condition item table is selected from the condition item table group 33, and the contents of this condition item table are compared with the data stored in the corresponding plant state storage area. An example of the condition item table is shown in FIG. The first mismatched item is detected by comparing from the earliest sequence operation order shown in FIG. This is set as an abnormal item in the abnormal item display section 38.
to be displayed.

FIG. 2 shows an example of a logic diagram indicating abnormal operation. In FIG. Specify trigger-input 1, 2, 3, and 4, and set the corresponding condition item table as condition item table-1.
(331), Condition item table-2 (332), Condition item table-
3 (333) and condition item table-4 (334), the correspondence can be easily made.

If signals 2, 51, 52, 53, and 54 cannot be extracted as abnormal operation signals using the example sequence control device, the abnormal operation signal 5 is set as a representative trigger point, and it is specified which condition table is to be referred to for this trigger signal. It is possible to arbitrarily assemble the timing conditions by selecting the timing conditions from the currently input plant status.

For example, if driving 331, condition item table-4, driving 3
If 31 is not present, the activation command is referred to, and if the condition item table-2 is not present, the condition item table-1 is determined. An example of the condition item table is shown in FIG. Therefore, if the timing condition is not met, the condition check path will not be reached even if the trigger point is present.

In addition, in this embodiment, the data (database) of input information from the plant is also used for other purposes (normal data processing unit functions, such as logging, graphic display, etc.)
It goes without saying that if this device is used exclusively for this device, the plant state storage area 34 and the normal data processing section 39 can be omitted and the contents of the database 31 and the contents of the condition item table can be directly compared. Furthermore, a plant operation diagnosis apparatus including a plurality of microcomputer sequence control devices for one computer system can be constructed, and in either case, the efficiency of plant operation diagnosis is further improved.

〔Effect of the invention〕

As explained above, according to the present invention, unfulfilled sequence condition items that are the cause of sequence progress congestion can be automatically detected in a short time, and the burden on the sequence control device at this time is light, and all It goes without saying that the following condition items are checked, and there is no need for operators to make judgments, and furthermore, it is possible to save plant data for detailed analysis of the plant state at this time.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a plant operation diagnosis device showing an embodiment of the present invention, and Fig. 2 is a diagram for explaining one point of the explanation of the operation of the plant operation diagnosis device in Fig. 1. , a logic diagram showing that the causes of sequence progress congestion are roughly classified according to the four modes of sequence control, and Figure 3 is an explanation of the condition item table used in the plant operation diagnosis device of Figure 1. It is. DESCRIPTION OF SYMBOLS 1... Thermal or nuclear power generation plant, 2... Microcomputer type sequence control device, 3... Computer system, 4... Data link, 21... Control unit, 22... Database, 23... Abnormality detection section, 2
4...Data transmission control unit, 31...Database,
32... Data transmission control section, 33... Condition item table group, 34... Plant state storage area, 35... Abnormality check section, 36... Abnormality processing section, 37... Comparison section,
38... Abnormal item display section.

Claims (1)

[Claims] In a plant operation diagnostic device consisting of a sequence control device having a microcomputer as a component as a plant control device, and a control computer system that obtains process state information from the sequence control device through a data link, a means for inputting a condition item table expressing the contents of the sequence logic in the condition item table and an abnormal operation signal from the sequence control device corresponding to the condition item table, and inputting the plant status of each item in the condition item table and the abnormal signal. The sequence control device is equipped with a database containing information, receives and detects operational abnormality signals, and compares and verifies the plant status and the status of the condition item table based on the database information. A plant operation diagnostic device characterized by detecting items causing control abnormalities.