Control device, control method and program

Abstract

The control device adjusts the amount of fuel based on the rotational speed of the gas turbine so that the frequency of the electric power output by the generator that generates electric power through the gas turbine is within a certain range, and includes: a load value acquisition unit that, when the load applied to the generator is cut off, acquires the value of the load applied to the generator after the cut-off, that is, the load value; a calculation unit that calculates the load value and the deviation to calculate the value of the load different from the load value, that is, the adjustment value; and an instruction unit that outputs a first signal that causes the generator to output electric power equivalent to the adjustment value, thereby adjusting the amount of fuel.

Description

Technical Field

[0001] The present disclosure relates to a control device, a control method, and a program.

[0002] This application claims priority to Japanese Patent Application No. 2020-066463 filed in Japan on April 2, 2020, the contents of which are incorporated herein by reference. Background Art

[0003] Patent Document 1 discloses a technique for keeping the load within the operating limits of turbines in a power plant by generating power in accordance with the load in the plant when an isolated power plant operation occurs due to a power system accident.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2008-259366 Summary of the invention

[0007] -Problems to be solved by the invention-

[0008] In a power generation station in a station that supplies power to a factory or other station and receives / transmits power to an external power system, the load applied to the generator in the station changes due to the disconnection of the external power system, so that the frequency of the power output by the generator temporarily changes. The following technology is known: in order to stabilize the frequency, the power output by the generator is adjusted based on the load in the station applied to the generator after the disconnection. However, even if the adjustment is made, if the load of the disconnected external power system is larger than the load in the station, the frequency will change significantly due to inertia.

[0009] An object of the present disclosure is to provide a control device, a control method, and a program that solve the above-mentioned problems.

[0010] -Methods for solving problems-

[0011] The control device involved in the present disclosure adjusts the amount of fuel supplied to the gas turbine based on the rotational speed of the gas turbine so that the frequency of the electric power output by the generator that generates electric power through the gas turbine becomes within a certain range. The control device includes: a load value acquisition unit, which, when the load applied to the generator is cut off, acquires the value of the load applied to the generator after the cut-off, that is, the load value; a calculation unit, which calculates the value of the load different from the load value, that is, the adjustment value; and an instruction unit, which outputs a first signal that causes the generator to output electric power equivalent to the adjustment value, to adjust the amount of fuel.

[0012] In the control method involved in the present disclosure, a control device adjusts the amount of fuel supplied to the gas turbine based on the rotational speed of the gas turbine so that the frequency of the electric power output by the generator that generates electric power through the gas turbine becomes within a certain range. The control device has the following steps: when a load applied to the generator is cut off, a load value, which is a value of the load applied to the generator after the cut-off, is obtained; the load value and a deviation are calculated to calculate a value different from the load value, which is an adjustment value; and a first signal is output to make the generator output electric power equivalent to the adjustment value to adjust the amount of fuel.

[0013] The program involved in the present disclosure causes a computer of a control device to execute steps, wherein the control device adjusts the amount of fuel supplied to the gas turbine based on the rotational speed of the gas turbine so that the frequency of the electric power output by the generator that generates electric power through the gas turbine is within a certain range, and the program causes the computer of the control device to execute the following steps: when a load applied to the generator is cut off, obtaining a load value that is a value of the load applied to the generator after the cut off; calculating an adjustment value that is a value different from the load value by calculating the load value and a deviation; and outputting a first signal that causes the generator to output electric power equivalent to the adjustment value to adjust the amount of fuel.

[0014] -Effects of the Invention-

[0015] According to at least one of the above aspects, when the load applied to the generator is disconnected, the frequency of the electric power output by the generator can be suppressed from changing and the frequency of the electric power can be stabilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a diagram showing the configuration of a control system according to one embodiment.

[0017] Figure 2 This is a schematic block diagram showing the structure of a control device according to one embodiment.

[0018] Figure 3 This is a graph showing a load applied to a generator according to one embodiment.

[0019] Figure 4 This is a graph showing the amount of fuel supplied to the burner according to one embodiment.

[0020] Figure 5 This is a graph showing the electric power output by the generator according to one embodiment.

[0021] Figure 6 This is a graph showing the frequency of electric power output by a generator according to one embodiment.

[0022] Figure 7This is a circuit diagram showing control of a control system according to one embodiment.

[0023] Figure 8 This is a flowchart showing the operation of a control system according to one embodiment.

[0024] Fig. 9 This is a graph showing the frequency of electric power output by a generator according to one embodiment.

[0025] Fig.10 This is a schematic block diagram showing the structure of a control device according to one embodiment.

[0026] Fig.11 This is a flowchart showing the operation of a control system according to one embodiment.

[0027] Fig.12 This is a schematic block diagram showing the structure of a computer involved in at least one embodiment. DETAILED DESCRIPTION

[0028] [First embodiment]

[0029] (Structure of control system)

[0030] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0031] Figure 1 It is a diagram showing the configuration of a control system 1 according to the first embodiment.

[0032] The control system 1 includes an in-station power system 10 , an external power system 20 , and a control device 100 .

[0033] The so-called power system refers to a system that integrates power generation and power transmission / reception for supplying power output from a generator to power receiving equipment.

[0034] The control system 1 is a system that supplies fuel related to the value obtained by calculating the load and deviation applied to the in-station power system 10 when the load applied to the external power system 20 is cut off. As a result, the control system 1 can suppress the fluctuation of the frequency of the power output by the in-station power system 10 to stabilize the frequency of the power.

[0035] The so-called load refers to the power consumed by equipment, etc.

[0036] When the load applied to the external power system 20 is cut off, the load that changes due to the cut off is also referred to as a lost load.

[0037] The in-plant power system 10 generates power in a plant equipment station including a generator 500 , supplies power to in-plant equipment 600 , or receives power from an external power system 20 .

[0038] The external power system 20 receives power from the in-station power system 10 or supplies power to the in-station power system 10. The external power system 20 is connected to the in-station power system 10 via electric wires or the like.

[0039] The control device 100 is a device that adjusts the amount of fuel supplied to the generator 500 based on a value obtained by calculating the load applied to the generator 500 and the deviation when the load applied to the generator 500 is cut off. Thus, the control device 100 can suppress the fluctuation of the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0040] (Structure of the power system in the station)

[0041] The configuration of the in-station power system 10 will be described below.

[0042] The power plant system 10 includes a gas turbine 30 , a generator 500 , and equipment 600 within the plant.

[0043] The gas turbine 30 includes an IGV (Inlet Guide Vane) 31 , a compressor 32 , a combustor 33 , a turbine 34 , a rotor 35 , and a fuel valve 36 .

[0044] The IGV 31 is provided on the inlet side of the compressor 32 , and adjusts the flow rate of air flowing into the compressor 32 .

[0045] The compressor 32 compresses the inflowing air to generate compressed air.

[0046] The combustor 33 mixes the air compressed by the compressor 32 with fuel to generate high-temperature combustion gas. Examples of the fuel include light oil, kerosene, natural gas, hydrogen, blast furnace byproduct gas, and coal gasification gas.

[0047] The turbine 34 rotates the rotor 35 by burning gas, thereby driving the generator 500 .

[0048] The rotor 35 connects the turbine 34 and the generator 500 , and is rotated by the turbine 34 , thereby transmitting power generated by the turbine 34 to the generator 500 to drive the generator 500 .

[0049] The fuel valve 36 adjusts the flow rate of the fuel gas supplied to the burner 33 .

[0050] The burner 33 generates high-temperature and high-pressure combustion gas by mixing fuel and air supplied through the fuel valve 36 and burning the mixture. The fuel valve 36 is a valve that adjusts the flow rate of fuel supplied to the burner 33 in response to a signal from the control device 100 .

[0051] The generator 500 is a device that outputs electric power using the power generated by the gas turbine 30. The generator 500 connects the in-station equipment 600A and the in-station equipment 600B, the gas turbine 30, and the external power system 20.

[0052] The in-station equipment 600 is a mechanical device that operates in a plant equipment station where the in-station power system 10 exists by supplying electric power output from the generator 500 .

[0053] The device that outputs power in the on-site power system 10 is the generator 500. The devices that consume power in the on-site power system 10 are the on-site devices 600A and 600B. The load of the on-site device 600A is referred to as load L1. The load of the on-site device 600B is referred to as load L2.

[0054] (External power system)

[0055] The external power system 20 is a system including a device that receives power output from the generator 500 of the station power system 10 and consumes power of the load L3 , and a generator (not shown) that supplies power to the station power system 10 and the like.

[0056] (Structure of control device)

[0057] The configuration of the control device 100 will be described below.

[0058] Figure 2 It is a schematic block diagram showing the structure of the control device 100 .

[0059] The control device 100 includes a rotation speed acquisition unit 110 , a determination unit 120 , a load value acquisition unit 130 , a calculation unit 140 , and an instruction unit 150 .

[0060] The rotation speed acquisition unit 110 acquires the rotation speed of the turbine 34 included in the gas turbine 30 .

[0061] The determination unit 120 determines whether the load of the external power system 20 is disconnected. For example, the determination unit 120 is connected to a disconnector (not shown) provided between the power system 10 in the station and the external power system 20, and when receiving a disconnection signal from the disconnector, the determination unit 120 determines that the load of the external power system 20 is disconnected. When the determination unit 120 does not receive a disconnection signal from the disconnector, the determination unit 120 determines that the load of the external power system 20 is not disconnected.

[0062] The load value acquisition unit 130 acquires a load value when the determination unit 120 determines that the load of the external power system 20 is disconnected. The load value is a value of the load applied to the generator 500 when the load of the external power system 20 is disconnected.

[0063] When the load of the external power system 20 is not cut off, the value of the load applied to the generator 500 is a value obtained by adding the value of the load of the external power system 20 to the value of the load of the in-station power system 10. That is, when the load of the external power system 20 is not cut off, the value of the load applied to the generator 500 is a value obtained by adding the loads L1, L2, and L3.

[0064] On the other hand, when the load of the external power system 20 is disconnected, the value of the load applied to the generator 500 becomes the value of the load of the station power system 10. That is, when the load of the external power system 20 is disconnected, the value of the load applied to the generator 500 becomes the value obtained by adding the loads L1 and L2. Hereinafter, the value obtained by adding the loads L1 and L2 is referred to as the station load.

[0065] The load value acquisition unit 130 is connected to the in-station device 600A and the in-station device 600B, and receives the value of the load L1 and the value of the load L2. Then, the load value acquisition unit 130 acquires the load value by adding the value of the load L1 and the value of the load L2. That is, the load value becomes the same value as the in-station load.

[0066] The calculation unit 140 calculates the adjustment value by calculating the load value obtained by the load value acquisition unit 130 and the preset deviation. The so-called adjustment value refers to the value of the load different from the load value. As an example of the deviation, a negative real number can be cited. That is, the adjustment value of the value lower than the value of the load in the station is calculated by the calculation unit 140. The power corresponding to the adjustment value is lower than the power represented by the value of the load in the station. As examples of the calculation of the load value and the deviation performed by the calculation unit 140, a value obtained by adding the load value and the deviation and a value obtained by multiplying the load value and the deviation can be cited.

[0067] The command unit 150 outputs a signal to the fuel valve 36 to adjust the amount of fuel supplied to the burner 33 so that the frequency of the power output by the generator 500 is within a certain range. Examples of the above-mentioned certain range include 49.5 Hz or more and 50.5 Hz or less.

[0068] The operation of the instruction unit 150 will be described in detail below.

[0069] The command unit 150 outputs a signal to the fuel valve 36 based on the rotation speed of the turbine 34 obtained by the rotation speed acquisition unit 110 to adjust the amount of fuel so that the frequency of the power output by the generator 500 is within a certain range. For example, when the rotation speed of the turbine 34 obtained by the rotation speed acquisition unit 110 exceeds a certain range, the command unit 150 outputs a signal to reduce the amount of fuel to the fuel valve 36. As a result, the amount of fuel of the burner 33 counted by the fuel valve 36 becomes less. For this reason, the rotation speed of the turbine 34 becomes lower. That is, the command unit 150 can make the rotation speed within a certain range when the rotation speed of the turbine 34 exceeds a certain range. The frequency of the power output by the generator 500 changes by the rotation speed of the turbine 34. For this reason, through the operation of the command unit 150, the control system 1 can make the frequency of the power output by the generator 500 within a certain range.

[0070] When the rotation speed of the turbine 34 obtained by the rotation speed acquisition unit 110 is lower than a predetermined range, the command unit 150 outputs a signal to increase the amount of fuel to the fuel valve 36. As a result, the amount of fuel supplied to the combustor 33 by the fuel valve 36 increases. For this reason, the rotation speed of the turbine 34 increases. That is, the command unit 150 can make the rotation speed of the turbine 34 within a certain range when the rotation speed is lower than a certain range. For this reason, through the operation of the command unit 150, the control system 1 can make the frequency of the power output by the generator 500 within a certain range.

[0071] Furthermore, when the load of the external power system 20 is cut off, the command unit 150 outputs a first signal to the fuel valve 36 to cause the generator 500 to output power corresponding to the adjustment value, thereby adjusting the amount of fuel supplied to the combustor 33 .

[0072] The operation of the control system 1 when the instruction unit 150 outputs the first signal to adjust the amount of fuel will be described below.

[0073] When the load of the external power system 20 is disconnected, the determination unit 120 determines that the load of the external power system 20 is disconnected. Then, the load value acquisition unit 130 acquires the load value. The calculation unit 140 calculates the adjustment value based on the load value acquired by the load value acquisition unit 130 and the deviation. The instruction unit 150 outputs the first signal to the fuel valve 36 to adjust the amount of fuel supplied to the burner 33 so that the generator 500 outputs power corresponding to the adjustment value.

[0074] When the load of the external power system 20 is not cut off, the power output by the generator 500 is equivalent to the value obtained by adding the value of the station load and the value of the load L3. On the other hand, when the load of the external power system 20 is cut off, the fuel valve 36 receives the first signal from the command unit 150 as the fuel command value to adjust the amount of fuel supplied to the burner 33. As a result, the power output by the generator 500 is equivalent to the station load.

[0075] Figure 3 2 is a graph showing a change in the load applied to the generator 500 when the load of the external power system 20 is cut off. Figure 3 The vertical axis of the graph represents the load applied to the generator 500 . Figure 3 The horizontal axis of the graph represents time. Figure 3 The time C indicates the time at which the load of the external power system 20 is disconnected.

[0076] like Figure 3 As shown in FIG. 1 , the load applied to the generator 500 decreases from time C. Before time C, the load applied to the generator 500 is a value obtained by adding the value of the station load and the value of the load L3. On the other hand, if the load L3 is disconnected at time C, a loss of load occurs, and the load applied to the generator 500 decreases. That is, after time C, the load applied to the generator 500 becomes the value of the station load.

[0077] Figure 4 1 is a graph showing the amount of fuel supplied to the combustor 33 by the fuel valve 36 according to the fuel command value when the load of the external power system 20 is shut off. Figure 4 The vertical axis of the graph represents the amount of fuel supplied to the burner 33 by the fuel valve 36 . Figure 4 The horizontal axis of the graph represents time. Figure 4 The solid line of the graph of represents the amount of fuel supplied to the burner 33 of the control system 1 . Figure 4 The dotted line in the graph of represents the amount of fuel supplied to the burner of the other system when the amount of fuel is adjusted by a system other than the control system 1 (hereinafter referred to as the other system). Unlike the control system 1 that adjusts the amount of fuel based on the adjustment value, the other system adjusts the amount of fuel supplied to the burner based on the load value. The other system and the control system 1 are similar in structure except for the adjustment of the amount of fuel described above.

[0078] like Figure 3As shown in FIG. 1 , at time C, the load applied to the generator 500 is reduced by the amount of the lost load. To this end, the load value acquisition unit 130 acquires the value of the load in the station as the load value. The calculation unit 140 calculates the adjustment value by calculating the acquired load value and the deviation. The instruction unit 150 outputs the first signal indicating the amount of fuel to the fuel valve 36 based on the adjustment value. Figure 4 As shown, the fuel valve 36 receives the first signal as a fuel command value to reduce the amount of fuel supplied to the combustor 33 .

[0079] The fuel valves of the other systems also reduce the amount of fuel supplied to the burner at time C. However, the other systems that adjust the amount of fuel based on the load value instead of the adjustment value supply a larger amount of fuel to the burner than the control system 1 after time C. Since the control system 1 supplies the amount of fuel to the burner 33 based on the adjustment value, it supplies the amount of fuel to the burner 33 less than the other systems that adjust the amount of fuel based on the load value by an amount corresponding to the deviation.

[0080] After time C, the command unit 150 of the control system 1 outputs a second signal that is a signal that changes the power output by the generator 500 from the adjustment value to a value corresponding to the load value over time, thereby adjusting the amount of fuel. As a result, the fuel valve 36, which receives the signal as the fuel command value, adjusts the amount of fuel supplied to the burner 33. That is, the amount of fuel corresponding to the deviation gradually becomes zero.

[0081] Similarly, after time C, the command unit of the other system also outputs a signal to the fuel valve so that the frequency of the power output by the generator falls within a certain range. Thus, the fuel valve receiving the signal adjusts the amount of fuel supplied to the burner 33 .

[0082] At time C, the amount of fuel supplied by the fuel valve 36 of the control system 1 and the fuel valves of other systems are different. However, since the load in the station after time C is the same, the amount of fuel supplied by the fuel valve 36 of the control system 1 and the fuel valves of other systems becomes the same.

[0083] Figure 5 1 is a graph showing the electric power output by the generator 500 when the load of the external power system 20 is cut off. Figure 5 The vertical axis of the graph represents the electric power output by the generator 500 . Figure 5 The horizontal axis of the graph represents time. Figure 5 The solid line in the graph of represents the electric power output by the generator 500 of the control system 1 . Figure 5 The dotted lines in the graph represent the power output by the generators of other systems.

[0084] Before time C, the power outputted by the generator 500 is equivalent to the value obtained by adding the value of the load L3 to the value of the load in the station. On the other hand, if the load is cut off by the amount of the load loss at time C, the power outputted by the generator 500 is equivalent to the adjusted value. When a certain time has passed from time C, the power outputted by the generator 500 becomes equivalent to the load in the station by the signal outputted by the command unit 150.

[0085] On the other hand, the power outputted by the generators of other systems after time C is equivalent to the load in the station. That is, the power outputted by the generators of other systems after time C is greater than the power outputted by the generator 500 of the control system 1 after time C by an amount equivalent to the deviation. When a certain time has passed since time C, the power outputted by the generator 500 of the control system 1 and the generators of other systems becomes the same.

[0086] Figure 6 A graph showing the frequency of the electric power output by the generator 500 when the load of the external power system 20 is cut off. Figure 6 The vertical axis of the graph represents the frequency of the electric power output by the generator 500 . Figure 6 The horizontal axis of the graph represents time. Figure 6 The solid line of the graph represents the frequency of the electric power output by the generator 500 of the control system 1 . Figure 6 The dotted line of the graph represents the frequency of the electric power output by the generators of other systems.

[0087] Before time C, the frequency of the power output by the generator 500 is maintained within a certain range by the signal output by the command unit 150. Just after time C, the frequency of the power output by the generator 500 temporarily increases. Figure 3 As shown in FIG. 1 , the amount of load loss decreases from time C, but the power output by the generator 500 is as follows: Figure 5 As shown, it gradually decreases over a certain period of time from time C. Therefore, immediately after time C, an excess amount of power is generated in the power outputted by the generator 500, and the frequency of the power outputted by the generator 500 temporarily increases due to inertia caused by the excess amount.

[0088] like Figure 5As shown, until a certain time has passed from time C, the power output by the generator 500 of the control system 1 is lower than the power output by the generators of other systems. Therefore, until a certain time has passed from time C, the excess amount of power output by the generator 500 of the control system 1 is less than the excess amount of power output by the generators of other systems. For this reason, until a certain time has passed from time C, the change in the frequency of the power output by the generator 500 of the control system 1 is smaller than the change in the frequency of the power output by the generators of other systems. That is, when the load of the external power system 20 is cut off, the control system 1 can suppress the change in the frequency of the power output by the generator 500 compared with other systems to stabilize the frequency of the power.

[0089] Figure 7 1 is a circuit diagram showing control of the control system 1 .

[0090] When the control system 1 is normally operated, the control system 1 issues a fuel command based on the rotation speed of the turbine 34. Thus, the control system 1 adjusts the frequency of the electric power output by the generator 500 so as to fall within a certain range.

[0091] On the other hand, in the case where the load of the external power system 20 is cut off, the control system 1 issues a fuel instruction based on the in-station load and the deviation.

[0092] (Control system operation)

[0093] The following describes the operation of the control system 1 when the load of the external power system 20 is disconnected.

[0094] Figure 8 This is a flowchart showing the operation of the control system 1 when the load of the external power system 20 is cut off.

[0095] The load of the external power system 20 is disconnected. After that, the determination unit 120 receives a signal indicating disconnection from the disconnector, and determines that the load of the external power system 20 is disconnected (step S1).

[0096] The load value acquisition unit 130 acquires load values ​​from the in-station device 600A and the in-station device 600B (step S2 ). That is, the load value acquisition unit 130 acquires the load value by acquiring the value of the load applied to the generator 500 .

[0097] The calculation unit 140 calculates the adjustment value by calculating the load value acquired by the load value acquisition unit 130 in step S2 and a preset deviation (step S3 ).

[0098] The command unit 150 outputs the first signal to the fuel valve 36 based on the adjustment value calculated in step S3 (step S4 ).

[0099] The fuel valve 36 receiving the signal of step S4 adjusts the amount of fuel supplied to the burner 33 (step S5). That is, the fuel valve 36 receives the signal outputted in step S4 as the fuel command value and reduces the amount of fuel supplied to the burner 33.

[0100] Since the amount of fuel supplied to the burner 33 decreases in step S5, the power outputted by the generator 500 decreases (step S6). In step S6, the power outputted by the generator 500 becomes equivalent to the value obtained by subtracting the deviation from the in-station load.

[0101] The command unit 150 outputs a signal so that the power outputted by the generator 500 corresponds to the load in the station (step S7). Thus, after a certain time has passed since step S6, the power outputted by the generator 500 corresponds to the load value.

[0102] When the load of the external power system 20 is disconnected, the control system 1 adjusts the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load of the external power system 20 is disconnected is reduced. Therefore, when the load applied to the generator 500 is disconnected, the control system 1 can suppress the change in the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0103] In the control system 1, the control device 100 may be provided in the gas turbine 30. In this case, the command unit 150 of the control device 100 also adjusts the amount of fuel supplied to the combustor 33 by sending the first signal to the fuel valve 36 to cause the generator 500 to output the power corresponding to the adjustment value.

[0104] (Variation Example)

[0105] After outputting the first signal, the command unit 150 may output a plurality of signals to adjust the amount of fuel so that the generator 500 outputs electric power corresponding to the load value.

[0106] Fig. 9 : is a graph showing the frequency of the isolated grid operation system which the generator 500 of the control system 1 according to the modification example undertakes.

[0107] For example Fig. 9 As shown, after the command unit 150 sends the first signal at time C, it outputs three signals at time T1, time T2, and time T3 to adjust the frequency of the isolated grid operation system in charge of the generator 500 in stages.

[0108] (Function, Effect)

[0109] The control device 100 involved in the present disclosure adjusts the amount of fuel supplied to the gas turbine 30 based on the rotation speed of the gas turbine 30 so that the frequency of the electric power output by the generator 500 that generates electric power through the gas turbine 30 becomes within a certain range, and includes: a load value acquisition unit 130, which, when the load applied to the generator 500 is cut off, acquires the load value, which is the value of the load applied to the generator 500 after the cut-off; a calculation unit 140, which calculates the load value and the deviation to calculate the value of the load different from the load value, which is the adjustment value; and an instruction unit 150, which outputs a first signal to make the generator 500 output electric power corresponding to the adjustment value to adjust the amount of fuel.

[0110] When the load applied to the generator 500 is disconnected, the control device 100 adjusts the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load applied to the generator 500 is disconnected is reduced. Therefore, when the load applied to the generator 500 is disconnected, the control device 100 can suppress the change in the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0111] After outputting the first signal, the command unit 150 of the control device 100 according to the present disclosure outputs the second signal, which is a signal for changing the power output by the generator 500 from the adjustment value to a value corresponding to the load value over time, thereby adjusting the amount of fuel.

[0112] Thus, when the load of the external power system 20 is disconnected, the control device 100 can reduce the fluctuation in the frequency of the electric power output by the generator 500 before and after the disconnection.

[0113] Furthermore, when the load of the external power system 20 applied to the generator 500 is cut off, the load value acquisition unit 130 of the control device 100 acquires a load value which is a value of the load applied to the generator 500 after the cut off.

[0114] When the load of the external power system 20 is cut off, the control device 100 adjusts the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load of the external power system 20 is cut off is reduced. Therefore, when the load of the external power system 20 is cut off, the control device 100 can suppress the change in the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0115] [Second embodiment]

[0116] (Structure of control system)

[0117] A control system 1 according to a second embodiment will be described below.

[0118] The control system 1 according to the second embodiment calculates the deviation so that the value of the load of the generator 500 reduced by cutting off the load of the external power system 20 is proportional to the deviation. The control system 1 is a system in which an adjustment value is calculated based on the calculated deviation, and the generator 500 sends a first signal to the fuel valve 36 so that the power corresponding to the adjustment value is output.

[0119] The control device 100 of the control system 1 according to the second embodiment is configured such that a deviation calculation unit 160 is provided in addition to the configuration of the control device 100 of the control system 1 according to the first embodiment.

[0120] Fig.10 It is a schematic block diagram showing the configuration of a control device 100 according to the second embodiment.

[0121] The deviation calculation unit 160 calculates the deviation so that the value of the load of the generator 500 reduced by the cutoff of the load of the external power system 20 (hereinafter referred to as the reduction value) is proportional to the deviation. For example, the deviation calculation unit 160 obtains the reduction value by subtracting the load value from the value obtained by adding the load L1, the load L2, and the load L3 stored in the storage device (not shown) provided by the control device 100. The reduction value caused by the cutoff of the load of the external power system 20 is the same value as the load L3. Thereafter, the deviation calculation unit 160 calculates the deviation by multiplying the obtained reduction value by a predetermined coefficient. As an example of the above-mentioned coefficient, a real number greater than 1 can be cited. By calculating the deviation in this way, the deviation calculated by the deviation calculation unit 160 becomes proportional to the reduction value.

[0122] The deviation calculation unit 160 may calculate the deviation by calculation other than multiplication.

[0123] (Control system operation)

[0124] The operation of the control system 1 when the load of the external power system 20 is disconnected will be described below.

[0125] Fig.11 1 is a flowchart showing the operation of the control system 1 when the load of the external power system 20 is disconnected.

[0126] The operations from step S1 to step S2 and from step S3 to step S9 are the same as the operations from step S1 to step S2 and from step S3 to step S9 of the control system 1 according to the first embodiment.

[0127] The deviation calculation unit 160 obtains a decrease value based on the load value determined in step S2 and the value obtained by adding loads L1, L2, and L3 stored in the storage device. The deviation calculation unit 160 calculates a deviation by multiplying the obtained decrease value by a predetermined coefficient (step S21).

[0128] The deviation used when the calculation unit 140 calculates the adjustment value in step S3 is the deviation calculated in step S21 .

[0129] The control system 1 calculates the adjustment value based on the deviation calculated based on the reduction value caused by the cutoff of the load of the external power system 20. In addition, the control system 1 outputs the first signal to the fuel valve 36 so that the power calculated by the generator 500 is equivalent to the adjustment value. Thus, the control system 1 can adjust the power output by the generator 500 according to the reduction value caused by the cutoff of the load of the external power system 20, thereby further stabilizing the frequency of the power.

[0130] (Function, Effect)

[0131] The control device 100 according to the present disclosure includes a deviation calculation unit 160 that calculates a deviation so that the value of the load of the generator 500 reduced by shutdown is proportional to the deviation, and a calculation unit 140 that calculates the load value and the calculated deviation to calculate an adjustment value.

[0132] The control device 100 calculates the adjustment value based on the deviation calculated based on the reduction value caused by the cutoff of the load of the external power system 20. In addition, the control device 100 outputs the first signal to the fuel valve 36 so that the power calculated by the generator 500 is equivalent to the adjustment value. As a result, the control device 100 can adjust the power output by the generator 500 according to the reduction value caused by the cutoff of the load of the external power system 20, thereby further stabilizing the frequency of the power.

[0133] [Other embodiments]

[0134] An embodiment has been described in detail above with reference to the drawings, but the specific structure is not limited to the above, and various design changes can be made.

[0135] The control device 100 may calculate the deviation based on at least one of the operating conditions related to the generator 500 and the gas turbine 30. Examples of the operating conditions include the atmospheric temperature, the temperature of the generator 500, the temperature of the gas turbine 30, and the calorific value of the fuel. For example, the control device 100 may include a first correction unit that corrects the deviation based on at least one of the temperature of the gas turbine, the atmospheric temperature around the gas turbine, and the calorific value of the fuel.

[0136] By calculating the deviation as described above, the control device 100 can adjust the electric power output by the generator 500 based on the adjustment value suitable for the operating conditions, and can stabilize the frequency of the electric power.

[0137] In addition, the control device 100 may calculate the deviation based on the constraints of the gas turbine 30, such as the surge of the compressor 32 and the combustion stability of the combustor 33. For example, the control device 100 may include a second correction unit that corrects the deviation based on at least one value of the compressor surge and the stability of the fuel of the gas turbine.

[0138] By calculating the deviation as described above, the control device 100 can adjust the electric power output by the generator 500 based on the adjustment value suitable for the constraint condition of the gas turbine 30, and can stabilize the frequency of the electric power.

[0139] (Computer Architecture)

[0140] Fig.12 This is a schematic block diagram showing the structure of a computer according to at least one embodiment.

[0141] The computer 1100 includes a processor 1110 , a main memory 1120 , a storage 1130 , and an interface 1140 .

[0142] The control system 1 is installed in a computer 1100. The operations of the processing units are stored in the form of a program in a storage device 1130. The processor 1110 reads the program from the storage device 1130 and expands it in the main memory 1120, and executes the processing according to the program. In addition, the processor 1110 reserves the storage area corresponding to each storage unit as the main memory 1120 according to the program.

[0143] The program may be a program for realizing a part of the functions that the computer 1100 performs. For example, the program may be a program that performs functions by combining with other programs that have been stored in the storage 1130, or by combining with other programs installed in other devices. In addition, in other embodiments, the computer 1100 may have a customized LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to the above structure, or instead of the above structure. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, part of all of the functions implemented by the processor 1110 can be implemented by the integrated circuit.

[0144] Examples of the storage 1130 include a magnetic disk, a magneto-optical disk, and a semiconductor memory. The storage 1130 may be an internal medium directly connected to the bus of the computer 1100, or an external medium connected to the computer via the interface 1140 or a communication line. In addition, when the program is published to the computer 1100 via a communication line, the computer 1100 that has received the publication may expand the program in the main memory 1120 and execute the above-mentioned processing. In at least one embodiment, the storage 1130 is a non-temporary tangible storage medium.

[0145] In addition, the program may be a program for realizing a part of the aforementioned functions. Furthermore, the program may be a program for realizing the aforementioned functions by combining with other programs already stored in the storage 1130, that is, a so-called differential file (differential program).

[0146] [Note]

[0147] The control device 100 described in each embodiment can be understood, for example, as follows.

[0148] (1) The control device 100 involved in the present disclosure adjusts the amount of fuel supplied to the gas turbine 30 based on the rotation speed of the gas turbine 30 so that the frequency of the electric power output by the generator 500 that generates electric power through the gas turbine 30 is within a certain range. The control device 100 includes: a load value acquisition unit 130, which, when a load applied to the generator 500 is cut off, acquires a load value, which is a value of the load applied to the generator 500 after the cut-off; a calculation unit 140, which calculates a load value different from the load value by calculating the load value and a deviation; and an instruction unit 150, which outputs a first signal to make the generator 500 output electric power corresponding to the adjustment value, thereby adjusting the amount of fuel.

[0149] When the load applied to the generator 500 is disconnected, the control device 100 adjusts the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load applied to the generator 500 is disconnected is reduced. Therefore, when the load applied to the generator 500 is disconnected, the control device 100 can suppress the change in the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0150] (2) After outputting the first signal, the command unit 150 of the control device 100 according to the present disclosure may output a second signal that changes the power output by the generator 500 from the adjustment value to a value corresponding to the load value over time to adjust the amount of fuel.

[0151] Thus, when the load of the external power system 20 is disconnected, the control device 100 can reduce the fluctuation in the frequency of the electric power output by the generator 500 before and after the disconnection.

[0152] (3) Furthermore, when the load of the external power system 20 applied to the generator 500 is cut off, the load value acquisition unit 130 of the control device 100 may acquire a load value which is a value of the load applied to the generator 500 after the cut off.

[0153] When the load of the external power system 20 is cut off, the control device 100 adjusts the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load of the external power system 20 is cut off is reduced. Therefore, when the load of the external power system 20 is cut off, the control device 100 can suppress the change in the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0154] (4) The control device 100 according to the present disclosure may include a deviation calculation unit 160 that calculates a deviation so that the value of the load of the generator 500 reduced by the shutdown is proportional to the deviation, and the calculation unit 140 calculates the adjustment value by calculating the load value and the calculated deviation.

[0155] The control device 100 calculates the adjustment value based on the deviation calculated based on the reduction value caused by the cutoff of the load of the external power system 20. In addition, the control device 100 outputs a first signal to the fuel valve 36 so that the power calculated by the generator 500 is equivalent to the adjustment value. Thus, the control system 1 can adjust the power output by the generator 500 according to the reduction value caused by the cutoff of the load of the external power system 20, thereby further stabilizing the frequency of the power.

[0156] (5) The control device 100 may include a first correction unit that corrects the deviation based on at least one value among the temperature of the gas turbine, the temperature of the air around the gas turbine, and the calorific value of the fuel.

[0157] Thus, the control device 100 can correct the deviation based on the operating conditions such as the temperature of the gas turbine and the atmospheric temperature, and can further stabilize the frequency of the electric power output by the generator 500.

[0158] (6) The control device 100 may include a second correction unit that corrects the deviation based on at least one value of a compressor surge included in the gas turbine and stability of the fuel.

[0159] Thus, the control device 100 can correct the deviation based on the constraints of the gas turbine such as the compressor surge, and can further stabilize the frequency of the electric power output by the generator 500.

[0160] (7) In the control method involved in the present disclosure, the control device 100 adjusts the amount of fuel supplied to the gas turbine 30 based on the rotational speed of the gas turbine 30 so that the frequency of the electric power output by the generator 500 for generating electric power by the gas turbine 30 becomes within a certain range, and has the following steps: when the load applied to the generator 500 is cut off, obtaining the value of the load applied to the generator 500 after the cut-off, that is, the load value; calculating the load value and the deviation to calculate a value different from the load value, that is, the adjustment value; and outputting a first signal to make the generator 500 output electric power equivalent to the adjustment value to adjust the amount of fuel.

[0161] When the load applied to the generator 500 is disconnected, the user of the control method can adjust the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load applied to the generator 500 is disconnected is reduced. Therefore, when the load applied to the generator 500 is disconnected, the user of the control method can suppress the fluctuation of the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0162] (8) In the program involved in the present disclosure, the control device 100 adjusts the amount of fuel supplied to the gas turbine 30 based on the rotational speed of the gas turbine 30 so that the frequency of the electric power output by the generator 500 that generates electric power through the gas turbine 30 becomes within a certain range. The program causes the computer of the control device 100 to execute the following steps: when a load applied to the generator 500 is cut off, obtain the value of the load applied to the generator 500 after the cut-off, that is, the load value; calculate the value different from the load value, that is, the adjustment value, by calculating the load value and the deviation; and output a first signal that causes the generator 500 to output electric power equivalent to the adjustment value to adjust the amount of fuel.

[0163] When the load applied to the generator 500 is cut off, the user of the program can adjust the power output by the generator 500 to be equivalent to the adjustment value. As a result, the excess amount of power output by the generator 500 immediately after the load applied to the generator 500 is cut off is reduced. Therefore, when the load applied to the generator 500 is cut off, the user of the program can suppress the fluctuation of the frequency of the power output by the generator 500 and stabilize the frequency of the power.

[0164] Industrial Applicability

[0165] The present disclosure relates to a control device, a control method, and a program.

[0166] According to the present disclosure, when the load applied to the generator is disconnected, the frequency of the electric power output by the generator can be suppressed from varying, thereby stabilizing the frequency of the electric power.

[0167] -Explanation of symbols-

[0168] 1 Control system

[0169] 10 Station power system

[0170] 20 External power system

[0171] 30 Gas Turbine

[0172] 100 Control device

[0173] 110 Speed ​​acquisition unit

[0174] 120 Judgment Department

[0175] 130 Load value acquisition unit

[0176] 140 Operation unit

[0177] 150 Command Department

[0178] 160 Deviation calculation department

[0179] 31 IGV

[0180] 32 Compressor

[0181] 33 Burner

[0182] 34 Turbine

[0183] 35 Rotor

[0184] 36 Fuel valve

[0185] 500 Generator

[0186] 600 On-site equipment

[0187] 1100 Computer

[0188] 1110 processor

[0189] 1120 Main memory

[0190] 1130 Storage

[0191] 1140 interface.

Claims

1. A control device for adjusting the amount of fuel supplied to a gas turbine based on the rotation speed of the gas turbine so that the frequency of electric power output by a generator generating electric power by the gas turbine falls within a certain range, the control device comprising: a load value acquisition unit for acquiring, when the load applied to the generator is cut off, a load value which is a value of the load applied to the generator after the cut off; a calculation unit that calculates the load value and the deviation to calculate an adjustment value that is a value of the load different from the load value; and a command unit configured to output a first signal causing the generator to output electric power corresponding to the adjustment value, thereby adjusting the amount of the fuel; After outputting the first signal, the command unit outputs a second signal that is a signal that changes the power output by the generator from the adjustment value to a value corresponding to the load value over time, thereby adjusting the amount of the fuel. The adjustment value is a value with a lower load than the load value, The command unit outputs the first signal, so that the fuel in an amount based on the adjustment value less than the amount based on the load value is supplied to the gas turbine, and the generator outputs electric power of a value corresponding to the adjustment value lower than electric power of a value corresponding to the load value. The command unit outputs the second signal after outputting the first signal, so that the amount of fuel equivalent to the deviation gradually becomes zero, and the amount of fuel supplied to the gas turbine gradually changes from the amount of fuel based on the adjustment value to the amount of fuel based on the load value, and the electric power output by the generator changes over time from a value equivalent to the adjustment value to a value equivalent to the load value.

2. The control device according to claim 1, characterized in that: The control device comprises: a deviation calculation unit that calculates the deviation so that a value of the load of the generator reduced by the shutoff is proportional to the deviation, The calculation unit calculates the adjustment value by calculating the load value and the calculated deviation.

3. The control device according to claim 1 or 2, characterized in that: The control device comprises: The first correction unit corrects the deviation based on at least one of the temperature of the gas turbine, the temperature of the air around the gas turbine, and the calorific value of the fuel.

4. The control device according to claim 1 or 2, characterized in that: The control device comprises: A second correction unit corrects the deviation based on at least one value of a compressor surge provided in the gas turbine and stability of the fuel.

5. The control device according to claim 1 or 2, characterized in that: When the load of the external power system applied to the generator is cut off, the load value acquisition unit acquires a load value which is a value of the load applied to the generator after the cut off.

6. A control method, wherein a control device adjusts the amount of fuel supplied to a gas turbine based on the rotation speed of the gas turbine so that the frequency of electric power output by a generator generating electric power by the gas turbine falls within a certain range, wherein the control device comprises the following steps: When the load applied to the generator is cut off, obtaining a load value which is a value of the load applied to the generator after the cut off; Calculating the load value and the deviation to obtain an adjustment value that is different from the load value; and outputting a first signal causing the generator to output electric power corresponding to the adjustment value to adjust the amount of the fuel, In the step of performing the adjustment, after outputting the first signal, a second signal is outputted which is a signal for changing the power outputted by the generator from the adjustment value to a value corresponding to the load value over time, thereby adjusting the amount of the fuel. The adjustment value is a value with a lower load than the load value, In the step of performing the adjustment, the fuel in an amount based on the adjustment value less than an amount based on the load value is supplied to the gas turbine by outputting the first signal, and the generator outputs electric power of a value corresponding to the adjustment value lower than electric power of a value corresponding to the load value. In the step of performing the adjustment, the second signal is output after the first signal is output, so that the amount of fuel corresponding to the deviation gradually becomes zero, the amount of fuel supplied to the gas turbine is gradually changed from the amount of fuel based on the adjustment value to the amount of fuel based on the load value, and the electric power output by the generator is changed over time from a value corresponding to the adjustment value to a value corresponding to the load value.

7. A storage medium having a program recorded thereon, the program causing a computer of a control device to execute steps, the control device adjusting the amount of fuel supplied to the gas turbine based on the rotation speed of the gas turbine so that the frequency of the power output by the generator generating power by the gas turbine falls within a certain range, the program being characterized in that the program causing the computer of the control device to execute the following steps: When the load applied to the generator is cut off, obtaining a load value which is a value of the load applied to the generator after the cut off; Calculating the load value and the deviation to obtain a value different from the load value, namely, an adjustment value; outputting a first signal causing the generator to output electric power corresponding to the adjustment value, thereby adjusting the amount of the fuel, In the step of performing the adjustment, after outputting the first signal, a second signal is outputted which is a signal for changing the power outputted by the generator from the adjustment value to a value corresponding to the load value over time, thereby adjusting the amount of the fuel. The adjustment value is a value with a lower load than the load value, In the step of performing the adjustment, the fuel in an amount based on the adjustment value less than an amount based on the load value is supplied to the gas turbine by outputting the first signal, and the generator outputs electric power of a value corresponding to the adjustment value lower than electric power of a value corresponding to the load value. In the step of performing the adjustment, the second signal is output after the first signal is output, so that the amount of fuel corresponding to the deviation gradually becomes zero, the amount of fuel supplied to the gas turbine is gradually changed from the amount of fuel based on the adjustment value to the amount of fuel based on the load value, and the electric power output by the generator is changed over time from a value corresponding to the adjustment value to a value corresponding to the load value.

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