JP3025151B2 - Power output 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 power generation output control device applied to a prime mover.

[0002]

2. Description of the Related Art A conventional apparatus will be described with reference to FIG. The power generation output set value command 1S is sent to the output controller 3 via the power generation output setter 2. The output control signal 3S from the controller 3 is
It is sent to the flow control valve 4 provided in the steam supply line 11 of the prime mover 5 that drives the generator 6. The output of the output detector 7 that detects the output of the generator 6 is sent to the output controller 3.

In the above, the power generation output set value command 1S
However, for example, when the power generation output setter 2 receives the input from a certain value and increases to another value, the power generation output setter 2 increases the output at a predetermined change rate, and then outputs an output set value signal 2S corresponding to the input. . The output controller 3 receives the output of the output setter and the output detector 7 and outputs an output control signal 3S for eliminating the deviation.
Is output. The flow control valve 4 receives the output control signal 3S,
Depending on the input, to adjust the flow rate to increase or decrease the output of the prime mover 5 (i.e. generator).

[0004] In this way, the generator 6 increases the output.Decrease
Then, the output of the generator output set value is maintained.

[0005]

In the above-mentioned conventional apparatus, there is a peripheral device having a low followability in the process of increasing or decreasing the generator output. And its followability changes according to the generator output. In the case of the prime mover (steam turbine) 5, the peripheral device having a slow follow-up property is a boiler, and the followability varies depending on the turbine inlet steam flow rate positively correlated with the power generation output, that is, the boiler load. When the boiler load is large, the followability is good, and when it is small, the followability is poor.

Therefore, when the output is increased or decreased, the tracking is good when the boiler load is larger than the value indicated by the broken line in FIG. 4A, and the tracking is poor when the boiler load is smaller than the value indicated by the broken line.

On the other hand, since the rate of change of the power generation output setter 2 is a predetermined constant value, based on the range in which the boiler follows poorly,
There is no other way than to set the power generation output setting change rate corresponding to this. As a result, the power generation output set value changes at the same power generation output setting change rate even in a range where the boiler load is large as shown in FIG. 4B, and the power generation output also changes as shown in FIG. I do. Therefore, there is a problem that it takes time to increase and decrease the power generation output.

[0008]

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

That is, a power generation output setter for inputting a power generation output set value command and increasing and decreasing the power generation output set value signal at a predetermined change rate, and a generator drive receiving the output of the power generation output setter An output controller that outputs an output control signal for controlling the output of the prime mover, wherein the plurality of power generation output setters having different predetermined rates of change, respectively, and a steam flow rate to the prime mover is detected. steam
A flow detector, a selector that receives the output of the steam flow detector and outputs a selection signal in accordance with the input, and receives the output of the selector and each of the power generation output setting devices and generates the power in accordance with the output of the selector. And a switch for switching the output of the output setting device and sending the output to the output controller.

[0010]

In the above, some peripheral devices of the prime mover have a slow follow-up property, and the follow-up property changes according to the load of the prime mover. Therefore, the selector selects a power generation output setter that selects a power generation output setter having a plurality of different rates of change that satisfy the above-mentioned load, that is , the followability according to the steam flow rate , for the peripheral device having the slowest follow-up capability in advance. It is set to output.

Therefore, when the power generation output set value command is increased, for example, from a certain value to another value, the selector receives the output of the steam flow rate detector and outputs a selection signal according to the input. The switch receives the selection signal and sends the output of the power generation output setting device according to the selection signal to the switching output controller. That is, the output of the power generation output setter, which increases at an optimum predetermined change rate, is sent to the output controller. The output controller outputs an output control signal according to the input.

As described above, a control performance with good followability can be obtained. That is, the time required for increasing or decreasing the output of the generator can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The parts described in the conventional example are assigned the same reference numerals, and the description thereof will be omitted. The parts related to the present invention will be mainly described.

In FIG. 1, two power generation output setting units 2a and 2b receiving a power generation output set value command 1S are provided. The change rate of the power generation output setter 2a is set to a small change rate corresponding to the followability in a region where the boiler load is small (a range A below the broken line in FIG. 2A). Similarly, output setting device 2
The change rate of b is set to a large change rate corresponding to the followability in a region where the boiler load is large (the range B indicated by the broken line or more in the figure). These outputs are sent to the power generation output controller 3 via the switch 10. A flow detector 8 is provided in the steam supply line 11, and the output thereof is sent to a switch 10 via a selector 9.

In the above, the power generation output set value command 1S
Is increased from one value to another, for example, the selector 9
Receives the output of the steam flow detector (load detector) 8 and outputs a selection signal 9S according to the input. That is, the input is
In the case (a), a selection signal for selecting the setting device 2a is output when the setting device 2a is in the range A, and in the range B, a selection signal for selecting the setting device 2b is output. Switch 10
Receives the selection signal 9S and sends the output of the power generation output setter corresponding to the selection signal to the output controller 3. That is, a power generation output setting signal that increases at an optimum rate of change is sent to the output controller 3. The output controller 3 outputs an output control signal 3S according to the input.

FIG. 2 is a time chart showing the above relationship.

As shown in FIG. 2, in the range where the boiler load is smaller than the value indicated by the broken line, the power generation output setter 2a is used. In the range where the boiler load is larger than the value indicated by the broken line, the power generation output setter 2b is used.
Are respectively selected. As a result, the power generation output set value changes as shown in FIG. 3C, and the power generation output also changes as shown in FIG.

As described above, a control performance with good followability can be obtained. That is, the time required for increasing or decreasing the power generation output is reduced.

Although two power generation output setting devices are provided in the above description, two or more power generation output setting devices may be provided.

[0020]

As described above, according to the present invention, a plurality of output setting devices are provided in consideration of the characteristics of peripheral devices, and output settings are made so that the follow-up performance is optimized according to the load on the prime mover. Since the output of the container is switched and output,
Power generation output control performance with good followability is obtained.

[Brief description of the drawings]

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

FIG. 2 is an operation explanatory view of the embodiment.

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

FIG. 4 is an operation explanatory view of the conventional example.

[Explanation of symbols]

 1S Power generation output set value command 2, 2a, 2b Power generation output setting device 3 Power generation output controller 4 Flow control valve 5 Prime mover 6 Generator 7 Generator output detector 8 Steam flow detector 9 Selector 10 Switch

Claims (1)

(57) [Claims] 1. A power generation output setter for inputting a power generation output set value command and increasing / decreasing a power generation output set value signal at a predetermined change rate, and a generator drive receiving the output of the power generation output setter An output controller that outputs an output control signal for controlling the output of the prime mover,
Select the predetermined change rate and a plurality of power output setter respectively different, for outputting a steam flow rate detector for detecting the steam flow to the prime mover, a selection signal in response to the input receiving the output of the steam flow rate detector And a switch for receiving the output of the generator and each of the power generation output setting devices, switching the output of the power generation output setting device in accordance with the output of the selector, and sending the output to the output controller. Output control device.