KR101816811B1 - Method for operating control of complex gas turbine - Google Patents

Abstract

The present invention relates to a method of controlling an operation of a complex gas turbine capable of efficiently operating a gas turbine while reducing costs. For example, after operation states of a first gas turbine and a second gas turbine are checked, and if both of the first gas turbine and the second gas turbine are stopped, whether common load is connected to the first gas turbine or to the second gas turbine is checked, and then the fuel cost and water cost are compared, such that one of the first gas turbine and the second gas turbine is firstly operated so as to apply a low-cost charge of the fuel cost and the water cost to the gas turbine to which the common load is connected.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for operating a complex gas turbine,

The present invention relates to a method for controlling operation of a combined gas turbine.

Generally, when two gas turbines are used in a combined power plant, two gas turbines can not be started at the same time. After one unit is started, the other one is started after a certain period of time. Likewise, if the use of two gas turbines is stopped, one is stopped first, and the other is stopped after a certain period of time. Here, power is generated using external power (for example, electric power supplied from KEPCO) until the other one is started and the other one is stopped. In addition, the complex power plant is a facility for peak load, and frequent starting and stopping are performed. Therefore, the cost difference becomes larger due to the priority start and stoppage of the gas turbine.

The present invention provides a method for controlling operation of a combined gas turbine that can reduce costs and efficiently operate a gas turbine.

A method for controlling an operation of a combined gas turbine according to the present invention includes the steps of checking the starting state of a first gas turbine and a second gas turbine to determine whether the first gas turbine and the second gas turbine are in a stopped state, The first gas turbine and the second gas turbine are connected to each other so that the gas turbine to which the common load is connected is charged at a lower cost than the fuel cost and the faucet charge, Starts one of the gas turbines first.

Also, if the common load is connected to the first gas turbine and the fuel ratio is greater than the faucet charge, the second gas turbine may be activated first.

In addition, if the common load is connected to the first gas turbine and the reception charge is greater than the fuel ratio, the first gas turbine can be started first.

In addition, if the common load is connected to the second gas turbine and the fuel ratio is greater than the faucet charge, the first gas turbine can be activated first.

In addition, if the common load is connected to the second gas turbine and the incoming charge is greater than the fuel rate, the second gas turbine can be activated first.

In addition, the operation control method of a combined gas turbine according to the present invention checks the startup state of the first gas turbine and the second gas turbine, and if the first gas turbine and the second gas turbine are both in an activated state, The first gas turbine and the second gas turbine are connected to each other so as to determine whether the gas turbine and the second gas turbine are connected to each other, One of the second gas turbines is stopped first.

Also, if the common load is connected to the first gas turbine and the fuel ratio is greater than the faucet charge, the first gas turbine may first be stopped.

In addition, if the common load is connected to the first gas turbine and the incoming charge is greater than the fuel rate, the second gas turbine may first be stopped.

In addition, if the common load is connected to the second gas turbine and the fuel ratio is greater than the faucet charge, the second gas turbine may first be stopped.

In addition, if the employment load is connected to the second gas turbine and the incoming charge is greater than the fuel rate, the first gas turbine may first be stopped.

In the operation control method of the combined gas turbine according to the embodiment of the present invention, it is possible to reduce the cost by comparing whether the common load is connected, the fuel cost and the reception charge, and by selecting and operating the operation gas turbine and the priority stop gas turbine have.

FIG. 1 is a flowchart illustrating a method of controlling an operation of a combined gas turbine according to an embodiment of the present invention. Referring to FIG.
2A and 2B are logic diagrams showing the flowchart of FIG. 1 for each case.
FIG. 3 is a screen showing a result of the operation control method of FIG. 1 to a user.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

Here, parts having similar configurations and operations throughout the specification are denoted by the same reference numerals. In addition, when a part is electrically connected to another part, it includes not only a direct connection but also a case where the other part is connected to the other part in between.

FIG. 1 is a flowchart illustrating a method of controlling an operation of a combined gas turbine according to an embodiment of the present invention. Referring to FIG. 2A and 2B are logic diagrams showing the flowchart of FIG. 1 for each case. FIG. 3 is a screen showing a result of the operation control method of FIG. 1 to a user.

When two gas turbines are used in a combined power plant, two gas turbines can not be started at the same time. After one unit is started, another unit is started after a certain period of time. Likewise, if the use of two gas turbines is stopped, one is stopped first, and the other is stopped after a certain period of time. Here, power is generated using external power (for example, electric power supplied from KEPCO) until the other one is started and the other one is stopped. In addition, the fuel cost for generating the gas turbine and the faucet charge according to the use of external power are different according to season and time. Therefore, in the present invention, the priority operation and the priority stopping of the two gas turbines are selected in consideration of this, so that the combined gas turbine is efficiently operated and the cost is reduced.

Referring to FIG. 1, an operation control method of a combined gas turbine according to an embodiment of the present invention includes a gas turbine startup status confirmation step, a common load connection confirmation step, and a fuel cost and a faucet charge comparison step. First, in the present invention, the combined gas turbine includes a first gas turbine GT1 and a second gas turbine GT2, and a load is connected to the first and second gas turbines GT1 and GT2. The load comprises a first load connected to the first gas turbine GT1, a second load connected to the second gas turbine GT2 and a second load connected to both the first gas turbine GT1 and the second gas turbine GT2, . That is, the common load operates by receiving power from the first gas turbine GT1 or the second gas turbine GT2.

In the gas turbine start-up state confirmation step, it is checked whether the first gas turbine GT1 and the second gas turbine GT2 are currently operating (S1). Specifically, in the gas turbine starting state checking step, it is confirmed whether the first gas turbine GT1 and the second gas turbine GT2 are off (S1). Here, if the first gas turbine GT1 and the second gas turbine GT2 are both off, a gas turbine for priority operation must be selected for starting the multiple gas turbine. Further, if both the first gas turbine GT1 and the second gas turbine GT2 are in an on state S11, a gas turbine for priority stop should be selected for stopping the combined gas turbine.

First, a method for selecting a gas turbine for operation will be described. If the first gas turbine (GT1) and the second gas turbine (GT2) are both in the off state (S1) in the step of checking the gas turbine starting state, the flow goes to the common load connection confirmation step (S2).

In the common load connection confirmation step S2, it is confirmed whether the common load is connected to the first gas turbine GT1 or the second gas turbine GT2. This is because the power used in the gas turbine line to which the common load is connected is greater, so that the common load is selected at a lower cost when starting the connected gas turbine. Therefore, after the common load connection confirmation step S2, the fuel cost and the faucet fee are compared (S3). In the step S3 of comparing the fuel cost and the faucet charge, the fuel ratio A for generating the gas turbine is compared with the faucet charge B.

For example, in the common load connection checking step S2, the common load is connected to the first gas turbine GT1, and in the step S3 of comparing the fuel cost and the faucet charge, the fuel cost A is lower than the faucet charge B If it is larger, the second gas turbine GT2 is selected to perform the first operation (S5). That is, when the common load is connected to the first gas turbine GT1, the power required at the line of the first gas turbine GT1 is large, ) Should be applied. Thus, the second gas turbine GT2 is activated first, and the line of the first gas turbine GT1 is supplied with external power. The operation control method of such a combined gas turbine is shown in the logic diagram shown in FIG. 2A. In addition, as shown in FIG. 3, such a result can be informed to a user on a monitor screen.

If the common load is connected to the first gas turbine GT1 in the common load connection checking step S3 and the faucet charge B is larger than the fuel ratio A in the fuel ratio and faucet charge comparing step S3 , The first gas turbine GT1 is selected to perform the first operation (S6). That is, when the common load is connected to the first gas turbine GT1, the power required in the line of the first gas turbine GT1 is large, so that the line of the first gas turbine GT1 has the fuel cost A, Should be applied. Thus, the first gas turbine GT1 is activated first, and the line of the second gas turbine GT2 is supplied with external power. The operation control method of such a combined gas turbine is shown in the logic diagram shown in FIG. 2B. In addition, as shown in FIG. 3, such a result can be informed to a user on a monitor screen.

For example, in the common load connection checking step S3, the common load is connected to the second gas turbine GT2, and the fuel ratio A is lower than the faucet charge B in the fuel ratio and faucet charge comparing step S4 If it is larger, the first gas turbine GT1 is selected to perform the first operation S5. That is, when the common load is connected to the second gas turbine GT2, the power required in the line of the second gas turbine GT2 is large, ) Should be applied. Thus, the first gas turbine GT1 is activated first, and the line of the second gas turbine GT2 is supplied with external power.

If the common load is connected to the second gas turbine GT2 in the common load connection checking step S2 and the faucet charge B is larger than the fuel ratio A in the step S4 of comparing the fuel cost with the faucet charge rate , The second gas turbine GT2 is selected to perform the first operation (S6). That is, when the common load is connected to the second gas turbine GT2, since the power required in the line of the second gas turbine GT2 is large, the line of the second gas turbine GT2 has the fuel cost A which is lower in cost, Should be applied. Thus, the second gas turbine GT2 is activated first, and the line of the first gas turbine GT1 is supplied with external power.

As described above, according to the operation control method of the combined gas turbine according to the embodiment of the present invention, by comparing whether the common load is connected, the fuel cost, and the reception charge, the operation gas turbine and the priority stop gas turbine are selected and operated, Can be saved.

Next, a method for selecting a gas turbine for stopping will be described. If the first gas turbine GT1 and the second gas turbine GT2 are both in the on state S11 in the step of checking the gas turbine starting state, the process moves to the common load connection confirmation step (S12).

In the common load connection confirmation step (S12), it is confirmed whether the common load is connected to the first gas turbine GT1 or the second gas turbine GT2. This is because the power used in the gas turbine line to which the common load is connected is greater, so that the common load is selected at a lower cost when starting the connected gas turbine. Therefore, after the common load connection checking step S12, the fuel cost and the faucet charge comparison step are shifted to the step S13. In the step S13 of comparing the fuel cost with the faucet charge, the fuel ratio A for generating the gas turbine is compared with the faucet charge B.

For example, in the common load connection checking step S12, the common load is connected to the first gas turbine GT1, and the fuel ratio A is lower than the faucet charge B in the faucet charge comparing step S13 If it is larger, the first gas turbine GT1 is selected and stopped first (S15). That is, when the common load is connected to the first gas turbine GT1, the power required at the line of the first gas turbine GT1 is large, ) Should be applied. Thus, the first gas turbine GT1 is stopped first and external power is supplied to the line of the first gas turbine GT1 until the second gas turbine GT2 is stopped. The operation control method of such a combined gas turbine is shown in the logic diagram shown in Fig. 2C. In addition, as shown in FIG. 3, such a result can be informed to a user on a monitor screen.

If the common load is connected to the first gas turbine GT1 in the common load connection confirmation step S12 and the water reception charge B is larger than the fuel ratio A in the fuel ratio and water reception charge comparison step S13 , The second gas turbine GT2 is selected and stopped first (S16). That is, when the common load is connected to the first gas turbine GT1, the power required in the line of the first gas turbine GT1 is large, so that the line of the first gas turbine GT1 has the fuel cost A, Should be applied. Therefore, the second gas turbine GT2 is stopped first, and the first gas turbine GT1 is continuously operated to be applied as the fuel ratio A. At this time, the line of the second gas turbine GT2 supplies external power until the first gas turbine GT1 is stopped. The operation control method of such a combined gas turbine is shown in the logic diagram shown in FIG. 2D. In addition, as shown in FIG. 3, such a result can be informed to a user on a monitor screen.

For example, in the common load connection checking step S12, the common load is connected to the second gas turbine GT2, and the fuel ratio A is lower than the faucet charge B in the fuel ratio and faucet charge comparing step S14 If it is larger, the second gas turbine GT2 is selected and stopped first (S16). That is, when the common load is connected to the second gas turbine GT2, the power required in the line of the second gas turbine GT2 is large, ) Should be applied. Thus, the second gas turbine GT2 is stopped first, and the external power is supplied to the line of the second gas turbine GT2 until the first gas turbine GT1 is stopped.

If the common load is connected to the second gas turbine GT2 in the common load connection checking step S12 and the faucet charge B is larger than the fuel ratio A in the fuel ratio and faucet charge comparing step S14 , The first gas turbine GT1 is selected and stopped first (S15). That is, when the common load is connected to the second gas turbine GT2, since the power required in the line of the second gas turbine GT2 is large, the line of the second gas turbine GT2 has the fuel cost A which is lower in cost, Should be applied. Thus, the first gas turbine GT1 is stopped first, and the second gas turbine GT2 is kept running so that it is applied to the fuel ratio A. At this time, the line of the first gas turbine GT1 supplies external power until the second gas turbine GT2 is stopped.

A method for selecting a gas turbine to be started or stopped first according to the above method is shown in Table 1 below. Here, the fuel cost is 68.47 won (as of September).

driving
situation time At start-up When stopped Faucet charge
(won) Unit 1 Unit 2 Unit 1 Unit 2

Public
Load
Unit 1
connect spring fall
(3-5,
September to October) The light load (23 ~ 09) 0 0 54.8 Medium load (09 ~ 10, 12 ~ 13, 17 ~ 23) 0 0 77.7 Maximum load (10 ~ 12, 13 ~ 17) 0 0 108.1 Summer
(June to August) The light load (23 ~ 09) 0 0 54.8 Medium load (09 ~ 10, 12 ~ 13, 17 ~ 23) 0 0 107.7 Maximum load (10 ~ 12, 13 ~ 17) 0 0 188.6 Winter
(October to February) The light load (23 ~ 09) 0 0 61.7 Medium load (09 ~ 10, 12 ~ 17, 20 ~ 22) 0 0 107.3 Maximum load (10 ~ 12, 17 ~ 20, 22 ~ 23) 0 0 163.9

Public
Load
Unit 1
connect spring fall
(3-5,
September to October) The light load (23 ~ 09) 0 0 54.8 Medium load (09 ~ 10, 12 ~ 13, 17 ~ 23) 0 0 77.7 Maximum load (10 ~ 12, 13 ~ 17) 0 0 108.1 Summer
(June to August) The light load (23 ~ 09) 0 0 54.8 Medium load (09 ~ 10, 12 ~ 13, 17 ~ 23) 0 0 107.7 Maximum load (10 ~ 12, 13 ~ 17) 0 0 188.6 Winter
(October to February) The light load (23 ~ 09) 0 0 61.7 Medium load (09 ~ 10, 12 ~ 17, 20 ~ 22) 0 0 107.3 Maximum load (10 ~ 12, 17 ~ 20, 22 ~ 23) 0 0 163.9

As described above, the present invention is not limited to the above-described embodiment, and it is to be understood that the present invention is not limited to the above-described embodiment, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

GT1: First gas turbine
GT2: 2nd gas turbine

Claims (10)

The first gas turbine and the second gas turbine are checked to determine whether the common load is connected to the first gas turbine and the second gas turbine when both the first gas turbine and the second gas turbine are stopped And first comparing one of the first gas turbine and the second gas turbine so that the fuel cost and the faucet charge are applied at a lower cost to the gas turbine to which the common load is connected, A method for controlling operation of a combined gas turbine. The method according to claim 1,
And when the common load is connected to the first gas turbine and the fuel ratio is larger than the reception charge, the second gas turbine is activated first. The method according to claim 1,
And if said common load is connected to said first gas turbine and said reception charge is greater than said fuel ratio, said first gas turbine is activated first. The method according to claim 1,
And when said common load is connected to said second gas turbine and said fuel ratio is greater than a faucet charge, said first gas turbine is activated first. The method according to claim 1,
And when said common load is connected to said second gas turbine and said reception charge is larger than the fuel ratio, said second gas turbine is activated first. The first gas turbine and the second gas turbine are checked to determine whether the common load is connected to the first gas turbine and the second gas turbine, And then comparing the fuel cost with the faucet charge so as to first stop one of the first gas turbine and the second gas turbine so that the charge of the fuel cost and the faucet charge is applied to the gas turbine to which the common load is connected, A method for controlling operation of a combined gas turbine. The method according to claim 6,
And if said common load is connected to said first gas turbine and said fuel ratio is greater than a utility charge, said first gas turbine is stopped first. The method according to claim 6,
If the common load is connected to the first gas turbine and the incoming charge is greater than the fuel rate, stopping the second gas turbine first. The method according to claim 6,
And if the common load is connected to the second gas turbine and the fuel ratio is greater than the faucet charge, the second gas turbine is stopped first. The method according to claim 6,
If the common load is connected to the second gas turbine and the incoming charge is greater than the fuel rate, stopping the first gas turbine first.

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