JP3305156B2 - Turbine load control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine control device for a turbine load power generation facility.

[0002]

2. Description of the Related Art FIG. 2 shows a system diagram of a conventional turbine power generation facility, and FIG. 3 shows a conventional turbine load control device.

In FIG. 2, the output of a turbine 20 generator 21 is connected to a system 24 via a main transformer 22 and a main switch 23 in order. Further, it is connected to an in-house load 27 via an in-house transformer 25 and an in-house switch 26 in order. As shown in FIG. 3, in the control device of the gas turbine 20, an increase signal of the generator load command signal 30s is input to the analog memory 1 through the OR gate 12. The reduced signal is input to the analog memory 1 via the OR gate 13. The output of the analog memory 1 passes from the terminal a of the switch 2 to the terminal d, the subtractor 6, the PI controller 7, and the adders 8 and 9 in that order to become the governor opening control signal 9s of the gas turbine.

The outputs of the analog memory 1 and the d terminal are sent to OR gates 12 and 13 via a difference monitor 5. The output of the in-house load setting device 3 is sent to the terminal b of the switch 2 and the output of the setting device 4 is sent to the terminal c.

The output of the d terminal of the switch 2 is sent to the adder 8. The actual load signal 31s of the generator 21 is sent to the subtractor 6.

The frequency setting signal 33s and the actual frequency signal 32s of the generator 21 are sent to the adder 9 through the subtracter 10 and the droop circuit 11 in order.

In the above, normally, the load setting command signal 30s for increasing or decreasing by the operator is supplied to the OR gates 12,1.
When the signal is sent to the analog memory 1 via the line 3, the output increases or decreases at a predetermined rate according to the input, and a predetermined load setting signal 1s is output.

[0008] During normal operation, the switch 2 is in ad communication. When the turbine is stopped, the flow is cd, and when the main switch 23 of the generator is opened, such as when the system load is interrupted, the flow is bd.

Therefore, the load setting signal 1s normally becomes the governor opening control signal 9s via the adders 8 and 9 in advance.
On the other hand, the load setting signal 1s is compared with the actual load signal 31s by the subtractor 6 and sent to the PI controller 7. Then, the corrected governor opening degree control signals are added, and these are added by the adder 8 to adjust the output of the turbine 20. Further, the frequency setting signal 33s and the actual frequency signal 32s are compared by the subtractor 10, and become the frequency adjustment control signal by the droop circuit 11,
The rotation speed of the turbine 20 is adjusted by the adder 9.

[0010] When the turbine is stopped, a fully closed setting signal is output from the load setting device 4, the governor is fully closed, and the turbine 2 is closed.
0 stops. On the other hand, the difference between the terminals a and d of the switch 2 is detected by the deviation monitor 5, and a decrease signal is sent to the analog memory 1 so that the difference is within a predetermined deviation.
Is set to a low set value.

When the load on the system is cut off, the predetermined load setting unit 3 outputs an in-house load setting signal 3s, and in the same manner as described above, a governor opening degree control signal 9s is generated, and the turbine is adjusted to meet the in-house load. 20 is controlled. The operation of the analog memory 1 operates in the same manner as described above, and is set close to the predetermined load setting.

[0012]

The above conventional turbine control device does not consider partial load interruption due to systematic factors, and switches to the on-site load setting device only when the main switch of the generator is opened. An operation to reduce the load to the equivalent of the in-station load was being performed.

Accordingly, when the system main load 23 of the generator is not opened, when the system partial load is cut off, the load setting signal 1s remains the same as before the load cutoff, and only the actual turbine load signal 31s is greatly reduced. It increases due to the integration operation. At this time, due to the change of the actual frequency signal 32, the output of the droop circuit 11 is in the direction of closing the governor valve (hereinafter referred to as GV), but this is not until the governor is closed with good followability.

[0014]

The present invention employs the following means to solve the above-mentioned problems.

That is, first and second OR gates respectively receiving increase and decrease of the generator load command signal, an analog memory receiving the outputs of the first and second OR gates and outputting a load setting signal, A control means for receiving the output of the analog memory and the actual load signal and generating a governor opening control signal by PI calculation; and a signal monitor for inputting the actual load signal and outputting the signal when the actual load signal exceeds a predetermined value. An off-delay timer receiving the output of the signal monitor, an AND gate receiving the output of the off-delay timer and the generator current low signal, and the analog memory and the actual load signal are supplied to terminals a and b, respectively.
A switch that will be input to the terminal, the switch of the terminal c and the upper
A deviation monitor that receives the output of the analog memory and outputs the output to the first and second OR gates when the difference is equal to or greater than a predetermined deviation, wherein the switch receives the output of the AND gate and turns off the output. ON when ac
At the time of b, it becomes bc communication.

[0016]

In the above invention, when the partial load is cut off in a system in which the main switch of the generator is not opened, the generator has a low current, so that the generator current low signal is input to the AND gate.

On the other hand, although the actual load signal is lower than before the interruption, it is output from the signal monitor because it is equal to or more than the predetermined value.
A signal that is turned off after a predetermined time by the off timer is sent to the AND gate. Therefore, since the AND gate is turned on for a predetermined time, the switch is bc. Deviation monitor is analog memo
When the difference between the output of the controller and the actual load signal is equal to or greater than a predetermined value, a decrease (increase) signal is sent to the analog memory via the first (second) gate. Analog memory decreases (increases) according to input,
The actual load signal is tracked and a load setting signal close to the actual load signal is output. This signal generates a governor opening control signal in the same manner as in the prior art.

In this way, the turbine output is controlled with good responsiveness and stably even when the partial load is cut off in a system where the main switch is not closed.

[0019]

An embodiment of the present invention will be described with reference to FIG.

The parts described in the conventional example are assigned the same reference numerals and their explanation is omitted, and the parts related to the present invention will be mainly described.

The increase signal and the decrease signal of the generator load command signal 30s are sent to the analog memory 1 via OR gates 12 and 13, respectively. The output of the analog memory 1 is sent to the terminal a of the switch. The outputs of the deviation monitor 5 are OR
Sent to gates 12 and 13.

The generator current low signal 34s is output from the AND gate 18
Sent to The actual load signal 31s is sent to the AND gate 18 through the signal monitor 16 and the off timer 17 in order.

The analog memory 1 is connected to the terminal a of the switch 15.
And the actual load signal 31s is input to the terminal b. The outputs of the terminals a and c of the switch 15 are output from the deviation monitor 14.
And sent to the OR gates 12 and 13. The output of the AND gate 18 is sent to the switch 15.

In the above, the main switch 23 of the generator 21
When the partial load of the system 24 does not open, the generator has a low current, so that the low generator current signal 34s is input to the AND gate 18 by the operation of the low current detection relay.

On the other hand, although the actual load signal 31s is lower than that before the interruption, the signal is output from the signal monitor 16 because it is equal to or more than the predetermined value X, and a signal which is turned off after the predetermined time T by the off timer 17 is sent to the AND gate 18. Sent. Therefore, since the AND gate 18 is turned on for a predetermined time, the switch 15 is in bc communication. The deviation monitor 14 sends a decrease (increase) signal to the analog memory 1 through the first (second) gate 12 (13) when the deviation between the output of the analog memory 1 and the actual load signal 31s is equal to or greater than a predetermined value. Analog memory 1 decreases (increases) according to input
The actual load signal 31s is tracked and the actual load signal 31s is tracked.
Is output. This signal generates the governor opening control signal 9s in the same manner as in the related art.

In the above, the judgment value of the signal monitor 16 is set to a predetermined value X.
The reason is that if the actual load signal 31s before the interruption is less than X, it can be controlled by a conventional circuit. The off-delay timer 17 is provided to operate the analog memory 1 for a predetermined time T until the turbine control is stabilized.

In this way, the output of the analog memory (the load setting signal 1s) tracks the actual load signal 31s, and the runaway of the integration operation of the PI controller 7 is prevented, and stable control is performed in the same manner as during normal operation. Done. Therefore, there is basically no large deviation between the actual load signal 31s and the load setting signal 1s, and the droop circuit 1
The 1 correction operates in the same manner as during normal operation.

[0028]

According to the present invention as described above,
Even when the main switch of the generator does not open and the partial load is interrupted, stable turbine load control can be achieved in the same manner as during normal operation.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is an overall system diagram of the embodiment and a conventional example.

FIG. 3 is a configuration block diagram of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Analog memory 2 Switcher 3 Setting device 4 Setting device 5 Deviation monitor 6 Subtractor 7 Proportional-integral controller 8 Adder 9 Adder 10 Subtractor 11 Droop circuit (proportional calculator) 12 OR gate 13 OR gate 14 Deviation monitor 15 Switching Instrument 16 Signal monitor 17 Off-delay timer 18 AND gate

Claims (1)

(57) [Claims] A first OR gate receiving an increase and a decrease of a generator load command signal, an analog memory receiving an output of the first and second OR gates and outputting a load setting signal, A control means for receiving the output of the analog memory and the actual load signal and generating a governor opening control signal by PI calculation; and a signal monitor for inputting the actual load signal and outputting the signal when the actual load signal exceeds a predetermined value. , and off day lay timer which receives the output of the signal monitor, an aND gate receiving the output and generator current low signal having the same off-day lay-timer, said analog memory and actual load signals are entered in a terminal and the terminal b respectively switched and vessels, c terminal and the Ana same switch
A deviation monitor that receives the output of the log memory and outputs the output to the first and second OR gates when the output is equal to or greater than a predetermined deviation, wherein the switch receives the output of the AND gate and turns off the output. A turbine load control device, wherein ac power is supplied and bc power is supplied when the turbine is ON.