JP2758279B2 - Power generation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation control device for improving the economy of a private power generation system and the reliability of supplied power.

[0002]

2. Description of the Related Art In general, in a private power generation facility, the power rate of the power company is low at night, so the purchased power of the power company is used as in-house power, and the power rate is high in the daytime. The generated power is supplied as in-house power. When a power outage is expected due to a lightning strike or the like, the in-house power generation equipment supplies the power at the maximum output as in-house power in order to prevent the trouble of stopping the operation of the production equipment due to the power outage. As described above, it is necessary to use the purchased power of the electric power company and the power of the private power generation equipment properly so as to improve the reliability and economic efficiency of the power supply.

FIG. 3 shows a system configuration diagram of the above-described private power generation facility.

[0004] The main steam passes through a steam control valve 2 controlled by a generated power control device 1 and is then subjected to a bleed condensate turbine generator 3.
Supplied to The steam supplied to the bleed condensing turbine generator 3 supplies bleed air to the factory via the first bleed line 4 and the second bleed line 5, and the remaining steam flows into the condenser 6. A part of the steam to the second bleed line 5 is released to the atmosphere by the silencer 8 via the atmosphere release valve 7. 2a indicates a governor and 2b indicates a governor motor.

Here, the control logic of the power generation control device will be described with reference to FIG.

[0006] The generated power control device 1 controls the generator output 10 with the output set value set by the generator output setter 9 as a target. First, the generator output setting device 9 is set by the subtractor 11.
The generator output 10 is subtracted from the output value of. The result is multiplied by the gain in the multiplier 12 and output to the low priority gate 13.

On the other hand, on the condensate side, the condensate flow rate 1 is controlled so that the condensate flow rate 15 does not exceed the set value of the condensate flow rate setter 14.
5 is controlled. That is, the condensate flow 15 is subtracted from the output value of the condensate flow setter 14 by the subtractor 16. The result is multiplied by a gain in a multiplier 17 and output to the low priority gate 13.

In the low value priority gate 13, a command for controlling the generator output and a command for preventing the condensate flow rate 15 from exceeding the set value of the condensate flow rate setting device 14 are input from the multiplier 12. The lower order is selected. That is, when the condensed water flow rate 15 is equal to or greater than the output value of the condensed water flow rate setting device 14, the output value of the subtraction value 16 becomes negative, and the command from the multiplier 17 is selected. Conversely, the condensate flow rate 15 is
When the output value is equal to or less than the output value, the output value of the subtraction value 16 becomes positive, and the control command of the generator output from the multiplier 12 is selected. Then, based on the selected command, the operation pulse generator 18 outputs a governor motor up command 19a or a governor motor down command 19b to the governor motor 2b to open and close the steam control valve 2. Accordingly, when the condensed water flow rate 15 becomes equal to or more than the output value of the condensed water flow rate setting device 14, the generator output 1
Stop the rise of zero. As described above, the upper limit value is set for the condensate flow rate 15, and the generator output 10 is controlled while the condensate flow rate 15 does not exceed the upper limit value.

[0009]

However, the above-described conventional power generation control device has the following problems.

That is, in the conventional power generation control apparatus 1, when the condensed water flow rate is equal to or more than the predetermined upper limit value, the increase of the generator output is stopped and the condensed water flow rate is controlled so as not to exceed the upper limit value. For this reason, it was not possible to supply the privately-generated electric power as a maximum output in the office when there is a possibility of a power outage such as when a lightning strike occurs, or during peak hours during the day. Therefore, there was a problem in inexpensive power supply and reliability.

Accordingly, an object of the present invention is to provide a generated power control device capable of increasing the generator output even when the condensate flow rate approaches the upper limit. [Configuration of the Invention]

[0012]

SUMMARY OF THE INVENTION The present invention provides a bleed condensing turbine generator, a steam control valve for adjusting the steam supplied to the bleed condensing turbine generator, and a bleed gas of the bleed condensing turbine generator. In a power generation control device that controls the power of a private power generation facility including a condenser for extracting air through an extraction line, releasing the air to the atmosphere by an air release valve, and condensing steam through a condensate line. , A generator-side subtractor that subtracts the generator output value from the set value of the generator output setter to set the generator output to a predetermined target value, and is set so that the condensate flow rate does not exceed a predetermined upper limit. A condensate-side subtractor that subtracts the condensate flow rate from the set value of the first flow rate setter having a value, and a value corresponding to the output of the power-generating-side subtractor and the output of the condensate-side subtractor. Enter the appropriate value and select the lower value between the two A value priority gate, a first operating device for controlling the opening and closing of the steam control valve based on the value selected by the low value priority gate, and a set value slightly lower than the set value of the first flow rate setting device A second flow setting device having a subtractor for subtracting the set value of the second flow setting device from the condensate flow, and opening and closing the atmospheric release valve based on a value corresponding to the output of the subtractor. And a second operating device for controlling the condensate flow rate.

[0013]

According to the above construction, when the condensate flow rate approaches the upper limit value, the air release valve is opened to release the bleed air to the atmosphere, so that the condensate flow rate does not exceed the upper limit value, thereby increasing the generator output. I can do it.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram of a power generation control device showing an embodiment of the present invention, and FIG. 2 is a control logic configuration diagram of the device. 3 and 4 denote the same or corresponding parts. The difference from FIG. 3 is that an analog memory 20 and an air release control valve 21 operated by the signal are provided instead of the air release valve 7. 4 in that a condensate flow rate setting unit 22, a subtractor 23, a multiplier 24, and an operation pulse generator 25 are additionally provided. In this embodiment, when the condensate flow rate approaches the upper limit, the air release control valve 21 is opened to release bleed air,
Thus, the generator output is increased without decreasing the condensate flow rate and keeping the condensate flow rate at or above the upper limit.

Here, even when the signal from the operation pulse generator 25 is interrupted, the analog memory 20 retains and outputs the value before the interruption. The atmospheric release control valve 21 is an analog memory 2
Opening / closing operation is performed by outputting 0. The condensate flow rate setting device 22
The set value of the condensate flow rate setting device 14, that is, the upper limit value, is set to a value slightly lower than the upper limit value. The subtractor 23 calculates the condensate flow rate 1
The set value of the condensate flow rate setting device 22 is subtracted from 5. The multiplier 24 multiplies the output value of the subtractor 23 by a predetermined gain and outputs a control command. Operation pulse generator 25
Outputs an air release control valve raising command 26a or an air release control valve lower command 26b based on the control command value.

In the above configuration, the generator power control device 1 controls the generator output 10 with the output set value set by the generator output setter 9 as a target. First, the generator output 10 is subtracted from the output value of the generator output setter 9 by the subtractor 11. The result is multiplied by the gain in the multiplier 12 and output to the low priority gate 13.

On the other hand, the condensate flow rate 15 is
The condensate flow rate 15 is controlled so as not to exceed the set value. That is, the output value of the condensate flow rate setter 14 is subtracted from the condensate flow rate 15 by the subtractor 16. The result is multiplied by a gain in a multiplier 17 and output to the low priority gate 13. In the low value priority gate 13, a control command from the multiplier 12 and a command for preventing the condensate flow rate 15 from being equal to or higher than the set value of the condensate flow rate setting device 14 are input. These two inputs are selected by the low value priority gate 13 and the lower one of the two commands is selected. Then, the operation pulse generator 18 is operated based on the selected command.
Outputs a governor motor up command 19a or a governor motor down command 19b to the governor motor 2b.
Open and close. Thus, when the condensate flow rate 15 becomes equal to or more than the output value of the condensate flow rate setting device 14, the increase of the generator output 10 is stopped, and the control of the generator output 10 is performed so that the condensate flow rate 15 does not increase any more. I do.

Here, for example, assuming that the set value of the condensate flow rate setting device 14 is F1 and the set value of the condensate flow rate set device 22 is F2, the set value F2 of the condensate flow rate set device 22 is The value is a slightly lower approach value, which is lower than the pressure vessel 14 and is smaller than F1 by α. Condensate flow rate setting unit 22 from condensate flow rate 15
Is subtracted by the subtractor 23. The subtraction value is multiplied by a gain by a multiplier 24, and the resulting control command value is pulsed by an operation pulse generator 25 and output as an atmospheric release control valve up command 26a or an atmospheric release control valve down command 26b. Thereby, the analog memory 2
The opening / closing control of the atmospheric release control valve 21 is performed via the control signal 0.

When the condensed water flow rate 15 slightly exceeds the set value F2 of the condensed water flow rate setting device 22, the operation result of the subtractor 23 becomes a positive value, and this value is multiplied by the gain by the multiplier 24, and the operation is performed. The pulse generator 25 outputs an atmospheric release control valve raising command 26a. As a result, the atmospheric release control valve 21 increases in the opening direction, and increases and releases the bleed air. Since the bleed air increases and flows to the second bleed line on the upstream side, the condensate flow rate 15 slightly decreases.

Even if the condensate flow rate 15 slightly decreases, the output of the generator does not decrease because the amount of steam flowing to the upstream second extraction turbine increases. Due to the decrease in the condensate flow rate 15, the low value priority gate 13 selects the command of the multiplier 12 on the power generation side, and the control valve 2 is opened to increase the generator output 10. Further, there is a margin up to the set value of the condensate flow rate setting device 14, that is, the upper limit value of the condensate flow rate 15. Here, the value of the generator output setter 9 is gradually increased so as not to exceed the upper limit value F1 of the condensate flow rate 15. In this manner, the power control command is selected by the low value priority gate 13 within a range not exceeding the upper limit value F1 of the condensate flow rate 15, and the governor motor raising command 19a is output from the operation pulse generator 18. As a result, the generator output 10 increases without exceeding the upper limit value F1 of the condensate flow rate 15.

On the other hand, the condensate flow rate 15 is
Is smaller than the set value F2, the operation result of the subtractor 23 becomes a negative value. That is, when the condensate flow rate 15 is F
When the value becomes 2 or less, this value is multiplied by the gain by the multiplier 24, so that the operation pulse generator 25 outputs the atmospheric release control valve lowering command 26b. Thereby, the atmospheric release control valve 2
1 is a closing operation, and condensate flow rate 15
Becomes an increasing direction.

As described above, when the condensed water flow rate 15 increases to a value not less than the set value F2 of the condensed water flow rate setting device 22, the power generation control device 1 outputs an atmospheric release valve opening command 26a to the atmospheric release control valve 21, The bleed air in the second bleed line is released to the atmosphere.
As a result, the condensate flow rate setting device 2 does not exceed the set value F1 of the condensate flow rate setting device 14 as the upper limit of the condensate flow rate 15.
The generator output 10 can be increased within the range of the set value F2 of 2 and the set value F1 of the condensate flow rate setting device 14, that is, the range of the value of α. Therefore, the amount of private power generation increases during the peak power hours, so that the economical efficiency can be improved by using power that is cheaper than power purchase. In addition, when lightning occurs, the private power generation output is maximized and more private power can be supplied, so that the reliability of power supply by preventing troubles such as a power outage is improved.

[0024]

As described above, according to the present invention, the economic efficiency can be improved by effectively utilizing the private power generation equipment and supplying inexpensive power. In addition, from the viewpoint of preventing a power failure, an effect is obtained that the reliability of power supply can be improved with the private power generation output being the maximum output supply.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a generated power control device according to an embodiment of the present invention.

FIG. 2 is a control logic configuration diagram of the device.

FIG. 3 is a system configuration diagram of a generated power control device showing a conventional example.

FIG. 4 is a control logic configuration diagram of the device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 power generation control device 2 steam control valve 3 bleed condensing turbine generator 4 first bleed line 5 second bleed line 6 condenser 9 generator output setter 11 subtracter 12 multiplier 13 low value priority gate 14 condensate Flow setting device 16 Subtractor 17 Multiplier 18 Operation pulse generator 21 Atmospheric release control valve 22 Condensate flow rate setting device 23 Subtractor 24 Multiplier 25 Operation pulse generator

Claims (1)

(57) [Claims] 1. A bleed condensing turbine generator, a steam control valve for adjusting steam supplied to the bleed condensing turbine generator, and bleeding of the bleed condensing turbine generator via a bleed line. Further, in a power generation control device for controlling the power of a private power generation facility including a condenser for discharging to the atmosphere by an air discharge valve and condensing steam through a condensate line, the generator output is set to a predetermined target. A generator-side subtractor for subtracting the generator output value from the set value of the generator output setter for setting the value, and a first flow rate setting having a set value so that the condensate flow rate does not exceed a predetermined upper limit value. Condenser-side subtractor for subtracting the condensate flow rate from the set value of the vessel, and a value corresponding to the output of the subtractor on the power generation side and a value corresponding to the output of the subtractor on the condensate side are input. , A low priority gate that selects the lower value of both, and this low value A first operating device for controlling the opening and closing of the steam control valve based on the value selected by the priority gate; and a second flow setting having a setting value slightly lower than the setting value of the first flow setting device. And a subtractor for subtracting the set value of the second flow rate setting device from the condensate flow rate,
And a second operation device for controlling the opening and closing of the air release valve based on a value corresponding to the output of the subtractor to increase or decrease the condensate flow rate.