JPS59201638A - Output controller of composite generating plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an output control device for a combined power generation plant having a run pack function.

[Technical background of the invention]

Recently, combined cycle power generation units have been developed with the aim of improving power generation efficiency. This power generation unit) combines a bagasse turbine, a steam turbine, and a generator on a single shaft, uses the exhaust gas that has driven the turbine to drive the steam turbine, and uses the driving force of both to drive the generator. This is designed to make effective use of thermal energy. However, each power generation unit has a small capacity, and it is uneconomical to operate each power generation unit independently. Therefore, in terms of system operation, a plurality of power generation units constitute one power generation plant. This power generation plant is called a combined power generation plant.

On the other hand, run pack control is a method that has recently come to be applied to single thermal power plants, and is used to prevent problems such as failure of auxiliary equipment during plant operation, making it impossible to continue the output before the failure. In this case, the power plant can continue operating by rapidly reducing its output to a load that can be maintained stably. For example, if two turbine-driven water pumps that supply water to a boiler are in operation and one of them stops due to a failure, the IA This is called load runback control.

[Problems with background technology]

As described above, in a single thermal power plant, by implementing runback control, efficient plant operation is possible when an abnormal situation occurs.

However, if we try to apply the runback method used in a single thermal power plant to a combined power generation plant consisting of multiple power generation units as described above, the output of each power generation unit will be reduced all at once, resulting in a reduction in efficiency. There was a problem in which good driving was not performed.

[Purpose of the invention]

An object of the present invention is to provide an output control device for a combined power generation plant that can efficiently operate the combined power generation plant during runback with a simple configuration without making complicated changes to the control device.

[Summary of the invention]

For this reason, the present invention provides a target load setting device and a stop unit selection device in addition to the integrated load control device that controls each power generation unit during normal times, so that only the necessary number of power generation units can continue to operate during runback, and the remaining power generation units can remain in operation. The present invention is characterized in that the power generation unit can be efficiently continued to operate during a run pack by applying a necessary target load directly to the setting device of the power generation unit to be stopped and continued operation.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 1 shows a configuration diagram of a combined power plant output control device according to an embodiment of the present invention.

1 is a general load control device (hereinafter referred to as GLC) that issues an output command to each power generation unit during normal operation, and includes a GLC master control section 11. Unit output control section 12° is composed of an adder 13 that adds the output feedback signal mw of each power generation unit and outputs a plant output feedback signal MW.

The GLC master control section 11, as shown in FIG.
Rate of change limiter 111. Adder 112. Upper and lower limit limiter 11
3. Subtractor 114. Operation number dyne switch 115. (consisting of a proportional integrator 116), a change rate limiter 11 to prevent sudden changes in the target load command signal TR given from the central power supply control room.
After limiting by 1, the adder 112 adds it to the automatic frequency control signal AF, which is also given from the central power supply control room, to create a full output request signal for the power generation plant. The upper and lower limits of this signal are limited by an upper and lower limit limiter 113, and in addition to the subtracter 114, the deviation from the total output feedback signal MW of the power plant is extracted. Furthermore, in order to distribute the deviation to the n number of power generation units by the operation number dyne switch 115,
/n, in addition to the proportional integrator 116, an output request signal RDP for each power generation unit is generated.

The unit output control section 12 also includes a rate of change limiter 121 . Upper and lower limit limiter 122, adder 1
23, the change rate and magnitude of the output request signal RDP are limited, and the adder 123 calculates the deviation from each power generation unit output feedback signal mw, and outputs each power generation unit output command.

Furthermore, 2 in FIG. 1 is a switch, 3 is a setting device for a fuel controller in a power generation unit, and 4 is a power generation unit which is a combination of a gas turbine and a steam turbine.

Reference numeral 5 designates a target load setting device which outputs a signal TX for opening and closing the switch 2, and at the same time outputs a simpack output request signal sp to the setting device 3. As shown in FIG. Back gain selection circuit 51, dyne setting device 52.
53 and each unit output setting circuit 54.

Reference numeral 6 denotes a stop unit selection device, which selectively stops a power generation unit according to the runback occurrence state, as will be described later.

With the above configuration, all switches 2 are in the illustrated closed state during operation. The GLC 1 uses the GLC master control unit 11 to generate an output request RDP based on the target load command signal TR and automatic frequency control signal AF given from the central power dispatch control room, and the total plant output feedback signal MW fed back from the adder 13. calculate.

Next, each unit output control section 12 calculates a fuel valve opening setting signal for each power generation unit 4 from this output request signal RDP and each power generation unit output feed pack signal mw, and outputs it from the switch 2 to the setting device 3. .

As a result, the power generation unit 4 generates an output corresponding to the output request signal RDP, and the power generation plant as a whole performs output adjustment based on the target load command signal TR and automatic frequency control signal AF given from the medium-heat power supply control room. It will be done.

On the other hand, if the operation of the fuel base is stopped at night when electricity demand is low, and the gas pressure supplied to the power generation unit 4 drops to the naturally occurring pressure 9, or the gas paperizer (liquid When the gas pressure decreases due to a failure of a device such as a device that vaporizes fuel), the stop unit selection device 6 stops the corresponding number of power generation units 4 based on the runback signal PB generated in response. The target load setting device 5 is informed of the stopped number NT. In the target load setting device 5, as shown in FIG.
1 corresponds to the runback gain, for example, to obtain 50% dyne, which makes the output of the entire plant 1/2 rated, or 75 dynes, which makes the output of the entire plant 3/4 rated,
Select dyne setter 52,53. Each unit output setting circuit 54 divides this selected gain by the number of currently remaining power generation units 4 and determines the number of power generation units (4). , calculates the output request signal sp for each unit, and supplies it to the setting device 3 of the power generation unit 4 that is in continuous operation. At the same time, each unit output setting circuit 54 outputs an opening/closing signal TX to open all the switches 2 and cut off signals from the GLC 1.

In this way, when a runback occurs, the runpack signal RB changes depending on the condition, for example, the degree of gas pressure drop.
Based on this, only the number of power generation units 4 that can continue to operate is left and the rest are stopped, and by making the necessary output settings from the target load setting device 5 to each setting device 3, the power generation units 4 can be operated at maximum efficiency. This enables efficient synback control of combined power generation plants.

It should be noted that the number of units to be stopped is determined by the stop unit selection device 6 in response to the simback signal RB, and when stopping the power generation units 4, measures are taken such as sequentially stopping them so that the operating rate is averaged. Not until now. Further, in the above embodiments, a drop in gas pressure was cited as an example of a runback factor, but it goes without saying that the runback factor is not limited to this.

〔Effect of the invention〕

As described above, according to the present invention, only the power generation unit corresponding to the runback load is left and the rest are stopped, and at the same time,
The output setting device of each power generation unit is separated from the integrated load control device and the target load can be set directly.
Efficient runback control can be performed in a short time with a simple configuration without making complicated changes to the overall control device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a combined cycle power plant output control device according to an embodiment of the present invention, Fig. 2 is a detailed block diagram of the GLC master control section of Fig. 1, and Fig. 3 is an illustration of the unit shown in Fig. 1. A detailed configuration diagram of the control section, FIG. 4 is a detailed configuration diagram of the target load setting device of FIG. 1. 1... General load control device (GLC), 219. Switch, 3... Setting device, 4... Power generation unit, 5... Target load setting device, 6... Stop unit selection device, 11
...GLC master control section, 12...Unit output control section, 13゜1.12,123...Adder, 51...
・Runback dyne selection circuit, 52', 53...
Gain setting device, 54...Each unit output setting circuit, 1
11.121... Rate of change limiter, 113.122...
- Upper and lower limit limiter, 114... Subtractor, 115... Operating number dyne switch, 116... Proportional integrator.

Claims (1)

[Claims] It consists of a combination of a gas turbine and a steam turbine, and has multiple power generating units that drive the generator to obtain the desired generator output based on the output command set in the setting device, and a load request signal from the central power dispatch control room. Output control of a combined power generation plant comprising an integrated load control device that calculates an output command for each of the power generation units based on an automatic frequency control signal and an output feedback signal from each of the power generation units, and sets it in each of the setting devices. In the apparatus, a stop unit selection device selectively stops each of the power generation units in response to a run pack signal, and a setting device of the power generation unit is separated from the integrated load control device in response to the run pack signal;
An output control device for a combined power generation plant, comprising: a target load setting device for setting a target load corresponding to a run pack load in the setting device.