JPH0154938B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a power plant monitoring device.

A conventional device of this type is shown in FIG. In the figure, 1 is the power generation plant to be monitored, 2
is the input IN given to the monitored power plant 1
3 is a comparison model output generator that is made to output a desired output (i.e., control target) for this input IN, and 3 is a comparison model output generator that outputs a desired output (i.e., control target) for this input IN. Each of the figures shows a plant determination device that obtains a difference output θ with a comparator 4, determines whether the plant should be stopped, and sends a stop signal ST to the power generation plant 1 to be monitored.

About the configuration of Figure 1 Monitored power generation plant 1
The difference output θ between the output of the reference model output generator 2 and the output of the comparison model output generator 2 can be used as an index representing the degree of abnormality in the power generation plant 1 to be monitored. When the boundary value is exceeded, the plant stoppage determination device 3 determines this and causes the target power generation plant 1 to make an emergency stop.

In the conventional plant monitoring device shown in Fig. 1, the plant stoppage judgment boundary value was determined in advance and the value was fixed regardless of the magnitude of the load.
Even if the supply and demand balance in the power system is out of balance and if plant 1 is stopped, there is a possibility that the load will be cut off or the system will collapse, there is a drawback that the plant has no choice but to be forcibly stopped.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional system, and calculates the difference between the current total load of the power system and the amount of power generation that can be generated, and the smaller this amount is, the lower the stop judgment boundary value is. The present invention aims to provide a plant monitoring device that can further reduce the possibility of load failure or entire system collapse without forcibly stopping the plant by increasing the value of .

An embodiment of the present invention will be described below with reference to FIG. 2, in which parts corresponding to those in FIG. 1 are denoted by the same reference numerals.
In this case, the plant shutdown determination device 3 compares the difference output θ between the monitored power plant 1 and the comparison model output generation device 2 with the shutdown determination boundary value to determine whether the plant should be shut down, as shown in FIG. In this case, the stop judgment boundary value is particularly received from the plant stop judgment boundary value calculation device 5. This plant stoppage determination boundary value calculation device 5 calculates the difference between the current total load amount and the possible power generation amount based on information obtained from the power system 6 to which the monitoring power generation plant 1 is connected via the system information transmission device 7. is calculated, and the plant stoppage determination boundary value y is calculated from that value.

Next, the operation will be explained. The difference output θ between the power generation plant 1 to be monitored and the comparison model output generation device 2 can be used as an index representing the degree of abnormality in the power generation plant 1 to be monitored, and this value is sent to the plant stoppage determination device 3. On the other hand, each current load amount and possible power generation amount in the power system 6 to which the monitored power generation plant 1 is connected are provided to the plant stoppage determination boundary value calculation device 5 via the system information transmission device 7. Here, the plant shutdown boundary value calculation device 5 calculates the difference x between the total load amount and the possible power generation amount, and
Based on the value, a plant stoppage determination boundary value y is determined using, for example, the functional formula y=f(x) as shown in FIG. 3 and sent to the plant stoppage determination device 3.

Here, as the function equation y=f(x), a relationship is selected such that the smaller the difference x between the current total load amount and the available power generation amount, the larger the stop judgment boundary value y, and the It is determined by comprehensively considering the loss caused by not stopping the plant 1 and the loss caused by load interruption or system collapse if the plant 1 is stopped.

The plant stoppage determination device 3 compares the difference output θ between the monitored power plant 1 and the comparison model output generation device 2 with the plant stoppage determination boundary value y, and determines the difference output θ.
If exceeds the boundary value y, a stop signal ST is sent to the monitored power plant 1 to stop the plant 1.

In addition, in the above-mentioned example, the case where the power generation plant 1 is connected to the electric power system 6 is shown, but by adaptively changing the plant stoppage judgment boundary value depending on the system status, it is possible to reduce the load or disconnection. The present invention can be applied to various plant systems that can reduce the possibility of system collapse.

In addition, in the above embodiment, the difference output θ between the monitored power plant 1 and the comparison model output generator 2 is
Although the case where an abnormality is determined based on the above is shown, various other abnormality determination methods may be used, such as determining an abnormality by analyzing the noise in the output of the power generation plant 1 to be monitored.

As described above, according to the present invention, by increasing the plant stoppage determination boundary value as the difference between the current total load amount and the available power generation amount becomes smaller, it is possible to avoid forcibly stopping the plant. The possibility of power failure or system collapse can be significantly reduced compared to conventional methods.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a conventional power plant monitoring device, Fig. 2 is a block diagram showing an example of a power plant monitoring device according to the present invention, and Fig. 3 is a block diagram showing an example of a power plant monitoring device according to the present invention. It is a curve diagram which shows an example of the function which calculates a stop judgment boundary value. 1... Power generation plant to be monitored, 2... Comparison model output generator, 3... Plant stoppage determination device,
4...Comparator, 5...Plant stoppage determination boundary value calculation device, 6...Power system, 7...System information transmission device.

Claims (1)

[Claims] 1 Based on the difference output between the output of the monitored power plant and the output of the reference model output generator, the difference output is compared with the stop judgment boundary value, and when the difference output exceeds the stop judgment boundary value, the plant is stopped. In a power generation plant monitoring device in which the determination device gives a stop signal to the power generation plant to be monitored, the difference between each current load amount and the possible power generation amount is determined from the power system to which the power generation plant to be monitored is connected. A plant stoppage determination boundary value calculation device that calculates the difference between the current total load amount and the available power generation amount by receiving the information through the system information transmission device, and calculates the plant stoppage determination boundary value based on the calculation result, The plant stoppage determination device compares the difference output between the plant stoppage determination boundary value and the outputs of the monitored power plant and the comparison model output generator, and issues a stop signal if the difference output exceeds the boundary value. A power generation plant monitoring device characterized in that the power generation plant to be monitored is stopped by transmitting data to the power generation plant to be monitored.