JPS6034360B2 - Power plant load adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load control device for power plants such as thermal power and nuclear power plants, and more particularly to a power plant load adjustment device that controls the load of a power plant in response to a load request signal from a central power supply station or the like. .

In recent power plants, in order to improve operational efficiency and frequency controllability, many power plants have adopted a system of comprehensively managing and controlling the operation of a large number of power plants, rather than a single power plant.

Therefore, each power plant must operate based on the load request signal from the central power supply station, but on the other hand, in order to completely protect each power plant and prevent accidents, the allowable load fluctuations determined for each power plant are required. It is necessary to automatically adjust the load inside the center. Regarding this point, in the past, operators used intuition and experience to determine the allowable load fluctuations based on the load request signal at that time after comprehensively considering the operating conditions at the time or the operating conditions since then. .

For this reason, it is difficult for inexperienced operators to properly determine the permissible fluctuations, and because the settings are done manually, they must constantly monitor and monitor not only during transient times but also during normal operation. I needed to leave it there. Therefore, if this monitoring is interrupted for some reason and the settings are not changed when they should be, the efficiency of the entire power plant group may be affected due to overload operation of auxiliary equipment due to excessive load or underload operation. This may lead to undesirable situations such as a decrease in the quality of the product.

In addition, accidents may occur due to thermal effects on the main engine due to overload operation of auxiliary equipment or instability of the entire power plant.
In view of the above, an object of the present invention is to operate a power plant group while complying with the load request signal determined for each individual power plant group, and to automatically apply restrictions necessary for safe operation of each power plant group. The object of the present invention is to provide a load adjustment device for a power generation plant that can perform the following steps.

In the present invention, although there are various factors that determine the allowable load fluctuation, we focus on the number of auxiliary machines in operation as a particularly important factor among these, and use this factor to limit the allowable load fluctuation.

In other words, many auxiliary machines in power plants (for example, various water pumps, coal feed mills, fans for combustion air or recirculation gas supply, etc.) are prepared in multiple sets, and when all of them are in operation, Although it is designed to be able to output the rated output, we focused on the fact that if some of these parts were to fall off, it would be possible to continue operation by reducing the load to the corresponding level, and decided to automatically set the allowable upper and lower limits in that case. It is something.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a load adjusting device for a power generation plant according to the present invention.
FIG. 2 is a block diagram showing an example.

In FIG. 1, an external load request signal 1 applied to a switch 2 is selectively switched with a manual load request signal 3 applied to the same switch 2. Therefore, the output of this switching device 2 is an external or manual load request signal, and this signal is set between the upper and lower limits set by the upper and lower limit automatic setting devices 6 and 7 of the allowable load fluctuation, respectively. The variation is limited by upper and lower limiters 4 and 5. The outputs of the limiters 4, 5 are applied to a rate of change limiter 8, which limits the rate of change of the load request signal to obtain a target load signal having a rate of change within a predetermined range. The allowable load fluctuation upper and lower limit automatic setting devices 6 and 7 have a current load signal 19 and upper and lower limit manual setting signals 2 as shown in FIG.
2 is added selectively. The allowable load fluctuation upper and lower limit automatic setting device 18 automatically determines the upper and lower limits of the allowable load fluctuation based on a signal 23 representing the number of operating auxiliary machines in the plant. This signal and the manual setpoint signal 22 are selected by the switch 21 and sent to the analog storage element 201. The output of this analog storage element 20 is also applied to a switch 17 for selectively switching with the current load signal 19;
The upper and lower limits of the allowable load upper and lower limit limiters 4 and 5 are set by the output. When holding the current load and performing actual load follow-up control, the switch 17 selects the current load signal 13. As is clear from the above explanation, the configuration shown in Figures 1 and 2 basically automatically controls the power generation output according to the request signal, and automatically controls the output during allowable load fluctuations and It is possible to realize the load adjustment device of the present invention that sets the rate of change within the allowable load fluctuation rate.

This configuration of the invention ensures stability and safety of the power plant while responding to external load demand signals. Therefore, the power plant itself can be completely protected, and as one power plant among a large number of power plants that are subject to integrated group control, it is possible to perform stable control that maximizes the power plant's capacity. The device of the invention therefore makes it possible to significantly improve the overall efficiency of a large number of integrated group-controlled power plants. FIG. 3 is a block diagram showing a modified embodiment of the present invention.

Each block shown in FIG. 3 is constituted by each block in the apparatus of FIG. 1, and the same blocks are indicated by the same figure numbers. In the apparatus shown in FIG. 3, the switching device 2 is placed after the allowable load variation upper and lower limit limiters 4 and 5, and the manually set load request signal 3 is not limited by the controllers 4 and 5. The device shown in FIG. 3 can also perform a similar operation by appropriately switching the manually set load request signal 3 at the time of abnormality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a load adjustment device for a power generation plant according to the present invention. FIG. 2 is a block diagram showing a specific embodiment of the device for automatically setting upper and lower limits of allowable load variation shown in FIG. 1. FIG. 3 is a block diagram showing another embodiment of the present invention. 2... Load request signal, external manual switch, 4, 5... Allowable load fluctuation upper and lower limit limiter, 6, 7... Allowable load fluctuation upper and lower limit automatic setting device, 8... Allowable load fluctuation Rate of change limiter, 20...
Analog memory element, 18... Allowable load variation upper/lower limit automatic setting device, 21... Allowable load variation upper/lower limit cutter. Multi-bacterial Z national ticket 3

Claims (1)

[Claims] 1. A load adjustment device for a power generation plant that controls the power generation output in accordance with a load request signal, the device comprising an upper and lower limit limit device for allowable load fluctuation that limits the load request signal between upper and lower limits of allowable load fluctuations for the power plant; a load change rate limiting device that limits the rate of change of the load request signal from the allowable load variation upper and lower limit limiting device; and a load change rate limiting device that receives a signal representing the number of auxiliary machines in operation in the power generating plant and allows load fluctuations in the power generating plant in response to the signal. 1. A load adjustment device for a power generation plant, comprising: an automatic allowable load fluctuation upper and lower limit setting device that sets upper and lower limit values of and outputs the upper and lower limit values to the allowable load fluctuation upper and lower limit limit device.