JPH073641B2 - Plant monitoring equipment - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a plant monitoring apparatus for checking whether an input signal of a plant is normal.

[Technical Background of the Invention and Problems Thereof] Generally, when a power plant or a chemical industry plant is monitored, the number of input signals for capturing the state is not small. In addition, the types of input signals have been diversified as the degree of dependence on computer-based plant monitoring has increased in recent years.

For example, in a thermal power generation system, the state of thousands of input signals is constantly monitored, and when an abnormality occurs, the operator is notified via an alarm device or a display device. It is important to monitor the state of the plant, but it is also important to monitor whether the value of the input signal for notifying the data from each part of the plant is normal.

FIG. 3 is a block diagram of a conventional plant monitoring device. The input signal A necessary for monitoring and controlling the plant 1 is input from each detection point provided in the plant to the plant monitoring device 3 formed by a computer via the input control device 2. Calculations and determinations are made in this device, and the results are output to the alarm device 5 and the display device 6 via the output control device 4. Information exchange between the operator and the plant monitoring device 3 is performed by the operator sole 7 and the display device 6. Requests from the operator to the plant monitoring system 3 are made from the operator console 7 via the input control device 2, and the response from the plant monitoring device 3 is sent via the output control device 4 to the display device 6.
Is displayed. .

In the plant monitoring device 3, the input signal A obtained through the input control device 2 is read by the input scanning means 8. The input signal A read by the input scanning means 8 is stored in the input signal storage means 9. The alarm check of the input signal value stored in the input signal storage means 9 is performed by the alarm check means 10. The alarm limit value storage means 11 stores an alarm limit value corresponding to each input signal of the input signal storage means 9. The alarm check means 10 retrieves the alarm limit value corresponding to the input signal A read from the alarm limit value storage means 11 and outputs the comparison result of both to the output control device 4.

The alarm limit value used for the alarm check means 10 changes depending on the plant condition. The input scanning means 8 is used to judge the plant state.
This is performed by the plant diagnosis means 12 in accordance with an alarm check command CK for determining a plant output from. The plant diagnosis means 12 extracts the input signal value from the input signal storage means 9 and judges the present plant state at the time of turbine ventilation, at 1/2 load, at full load, etc. For example, in the plant state of turbine ventilation, input signals of turbine reset, turning clutch, turbine speed are reset,
Judgment is made depending on whether it is in the 0 to 15 rpm state. The conditions for judging the plant state are stored in the plant diagnosis prescribed value storage means 13. Plant status diagnostic means 12
Issues a plant diagnosis command CK1 to the alarm check means 10 so that the alarm limit value corresponding to the plant state is checked.

The operator uses the operator console 7 to set the alarm limit value corresponding to each plant state. The alarm limit value set by the operator console 7 is stored in the alarm limit value storage means 11 via the input control device 2. The alarm limit value set by the operator is saved as the previous value unless the operator changes it again. Depending on the type of the input signal A, there is a signal that does not require the alarm check. The alarm limit value of such an input signal may be considered to be ± ∞ (infinity).

For example, it is assumed that the plant input signal A including an abnormal state is input to the plant monitoring device 3. In this case, the input signal A is read by the input scanning means 2 of the plant monitoring device 3 via the input control device 2, and each input signal A is stored in the input signal storage means 9. At this time point, the input signal A which is still in an abnormal state is not discriminated. Next, the input scanning means 8 issues an alarm check command CK to the alarm check means 10 and the plant diagnostic means 12 when all the input signals A have been read.

The alarm check means 10 receives the input alarm check command CK of the input scanning means 8 and fetches the input signal value from the input signal storage means 9 at once, and also the alarm limit corresponding to the plant state judged by the plant diagnosis means 9. The value is retrieved from the alarm limit value storage means 11 and the input signal value is compared with the alarm limit value. An abnormal input signal A is discriminated by this comparison, but an alarm is output via the output control device 4 only for the input signal A newly in the alarm state, and at the same time an alarm message is output to the display device 6. .

As described above, the conventional plant monitoring device 3 outputs an alarm to the alarm device 5 when an abnormality occurs in the plant, so that the abnormality can be clearly recognized and the display device 6 indicates that the abnormality has occurred. Since it is output, it is possible to prevent serious influence on the plant 1.

However, the operator sets the alarm limit value used to judge whether the input signals from each part of the plant are normal, so in a system that monitors thousands of points, that setting is a difficult task. Become.

That is, it is necessary to set an alarm limit value for each plant state for one input signal value. In addition to this, when the plant is started, the temperature of the plant and the like differ depending on the time when the plant has been stopped, and thus it is necessary to further set a fine alarm limit value. Therefore, there is a demand for a plant monitoring device having a function of reducing the burden on an operator by saving labor in setting an alarm limit value of the conventional plant monitoring device.

[Object of the Invention] The present invention aims to reduce the burden on an operator by automatically setting an alarm limit value used to determine whether the input signal value notified from each part of the plant is normal. To aim.

[Summary of the Invention] According to the present invention, a setting allowable range of an alarm limit value of an input signal from a plant is stored according to each plant state, and a setting allowable range corresponding to a current plant state and a current input signal are stored. Is a plant monitoring device that reduces an operator's burden by calculating an alarm limit value used in the next plant state.

[Examples of the Invention] In general, there are the following plant monitoring methods.

(1) Process alarm monitoring ... Safety zone deviation monitoring of plant equipment (2) Sensor abnormality monitoring ... Sensor detection signal level deviation monitoring (3) Process quantity validity monitoring ... Determining a reasonable value for the process quantity according to the plant condition Deviation monitoring within that range There is a monitoring method such as abnormality, but the present invention is for monitoring the adequacy of the process amount.

FIG. 1 is a block diagram showing an embodiment of a plant monitoring apparatus according to the present invention. The input signal A indicating the state of the plant 1 is input to the plant monitoring device 3 via the input control device 2. The input signal A is a signal from each detection point of the plant 1, and generally, a plurality of types are input. The plant monitoring device 3 performs a predetermined calculation based on the input signal A input via the input control device 2, and outputs the calculation result to the alarm device 5 and the display device 6 via the output control device 4. The alarm limit value for the alarm is set by the plant monitoring limit value automatic setting unit 16.

The operator of the operator console 7 is the plant monitoring device 3
It is provided to exchange information with.

The input signal A representing the state of the plant 1 is read by the input scanning means 8 in the plant monitoring device 3 via the input control device 2 and stored in the input signal storage means 9 as an input signal value. When the input scanning means 8 finishes reading all the input signal values, it issues an alarm check command CK to the alarm check means 10 and the plant diagnosis means 12. When the alarm check command CK is issued from the input scanning means 8, the plant diagnosis means 12 retrieves the input signal value required for plant diagnosis from the input signal storage means 9 and judges the present plant state.

When the alarm check command CK is issued from the input scanning means 8, the alarm check means 10 fetches the input signal value from the input signal storage means 9 at once, and stores the input signal value and the alarm limit value storage means 11 in advance. Yes Compare the alarm limit value corresponding to this input signal value. Then, when the input signal value deviates from the alarm limit value, an alarm is output to the alarm device 5 via the output control device 4. At the same time, an alarm message is output to the display device 6. Depending on the type of input signal, it is not always the case that an abnormality of the plant 1 is detected and an operator is alerted. In this case, the alarm limit value is ± ∞ (infinity)
You can think that it is in the state of. Next, the plant monitoring limit value automatic setting unit 16 that calculates and sets the alarm limit value, which is a feature of this embodiment, will be described. The plant monitoring limit value automatic setting unit 16 performs processing according to the operator's instruction when the plant state is stable (as an example, when ignition is combined, 1/4 load operation, and 1/2 load operation are stable). The operator's instruction is notified from the operator console 7 via the input / output control device 2 to the calculating means 14 as an operator command CK2.

The calculating means 14 issues a plant determination command CK3 to the plant diagnosing means 12 and notifies the plant state B from the plant diagnosing means 12. Then, the calculation means 14 calculates the alarm limit values of all the input signals and stores them in the alarm limit value storage means 11. The calculation method is obtained from the setting allowable range of the limit value stored in the limit specified value storage means 15.

The configuration of the limit specified value storage means 15 will be described. The limit specified value storage means 15 stores the allowable setting range of the alarm limit value corresponding to each plant state as shown in FIG.

FIG. 4 shows an example of the stored contents of the limiting specified value storage means 15 which is composed of four plant states with five input signals from the plant 1. For example, the setting allowable range of the input signal 1 is the upper limit value = + a1, the lower limit value = -a1 in the plant state (1), the upper limit value ++ ∞, and the lower limit value = −∞ in the plant state (2). Also, as an example of the plant state, in a thermal power plant,
It is possible to ignite the plant state (1), incorporate the plant state (2), set the plant state (3) to 1/4 load operation, and set the plant state (4) to 1/2 load operation.

Next, the calculation means 14 will be described.

FIG. 2 is a flowchart thereof. The operator's request for automatic setting of the alarm limit value is notified to the calculating means 14 via the input control device 2 as an operator command CK2. Upon receiving this notification, first in step 17, the plant state is read from the plant diagnostic means 12.

At step 18, it is checked whether or not the plant state registered in the limit specified value storage means 15 shown in FIG. 4 is met. If the plant state is not met, at step 25 the display device 5 is output via the output control device 4. To notify the operator. In step 19, the input signal value is read from the input signal storage device 9. In step 20, it is determined whether the read input signal has an alarm limit value set in the current plant state. That is, in FIG. 4, when the current plant state is (1), the input signal 2 has a setting allowable range of ± ∞.
Therefore, it is determined that the alarm limit value is not set. If there is an alarm limit value (when the setting allowable range is not infinite), the setting allowable range corresponding to the current plant state (in the case of the plant state (1) with the input signal 1 in FIG. 4, the upper limit value = + a1) , Lower limit value −a1). This process is performed in step 21. In step 22, the alarm limit value is calculated. The alarm limit value has an upper limit value and a lower limit value and is calculated by the following formula.

As an example, consider the case of the plant state (1) with the input signal 1 in FIG.

Upper limit value = input signal value + a1 Lower limit value = input signal value -a2

If it is determined in step 20 that there is no alarm limit value, in step 23 upper limit limit value = + ∞ and lower limit limit value = −∞ are set.

When the upper / lower limit alarm limit values are calculated as described above, the alarm limit values are stored in the alarm limit value storage means 11.

In the above description, the limit specified value stored in the limit specified value storage means 15 is processed as a fixed value, but the limit specified value is changed according to the signal (temperature, pressure, etc.) input from the plant. You can also do things.

In the present embodiment, since the alarm limit value used in the next plant state is calculated from the current input signal, if the current input signal is already abnormal, it is not possible to properly monitor it, This danger can be avoided by performing the method of monitoring the absolute value at an important point in the plant condition. Moreover, since an already abnormal input signal almost always falls outside the allowable setting range in the next plant state, it can be said that this danger is extremely small.

EFFECTS OF THE INVENTION According to the present invention, it is possible to automatically calculate and set an alarm limit value for each plant state, which is used for determining whether the input signal value notified from each part of the plant is normal.

In addition, the present invention, from the input signal of the current plant state,
The alarm limit value used in the next plant state is calculated using the set allowable range. This means monitoring how much the input signal value in the current plant state allows until the next plant state, and monitoring the alarm limit value at the change rate of the input signal. Therefore, more rational monitoring can be performed as compared with a device in which all alarm limit values are preset for each plant state. For example, in the case of a thermal power plant, each process amount such as temperature greatly differs depending on the plant stop time, but according to the present invention, even if the initial value of the process amount greatly differs, monitoring is performed within a change range that is allowed by thermal stress Therefore, it can be monitored more reasonably.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a flow chart of one embodiment, FIG. 3 is a block diagram of a conventional plant monitoring apparatus, and FIG. 4 is a stored content of a limit specified value storage means of one embodiment. 1 ... plant 2 ... input control device 3 ... plant monitoring device 4 ... output control device 5 ... alarm device 6 ... display device 7 ... operator console 8 ... input scanning means 9 ... input signal storage means 10 …… Alarm check means 11 …… Alarm limit value storage means 12 …… Plant diagnostic means 13 …… Plant diagnostic prescribed value storage means 14 …… Calculation means 15 …… Limit prescribed value storage means 16 …… Plant monitoring limit value automatic Setting unit A ... Input signal CK ... Alarm check command B ... Brant state CK1 ... Plant diagnosis command CK2 ... Operator command CK3 ... Plant judgment command

Claims (1)

[Claims] 1. A limit specified value storage means for storing an allowable setting range of an alarm limit value of an input signal from a plant according to each plant state, and a plant diagnostic means for judging a current plant state from the input signal. Operation means for calculating an alarm limit value used in the next plant state from the setting allowable range of the limit prescribed value storage means and the input signal determined according to the current plant state determined by the plant diagnosis means, A plant monitoring device comprising: