Power plant control device, power plant control method, and power plant control program

Abstract

To adjust satisfactorily an overshooting of an actual load value for a load request value in a load follow control of a power plant.SOLUTION: A power plant control apparatus includes a load request value acquiring unit, an actual load value acquiring unit, a bias value calculating unit, and a control signal generating unit. The load request value acquiring unit acquires a load request value for a power plant. The actual load value acquiring unit acquires an actual load value of the power plant. The bias value calculating unit calculates a bias value for the load request value, based on a first deviation between the load request value and the actual load value. The control signal generating unit generate a control signal for the power plant based on a second deviation between the actual load value and a post-addition load request value obtained by adding the bias value to the load request value. The bias value calculating unit calculates the bias value so that an absolute value of the load request value should be increased within a first range having the first deviation of zero.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A power plant that supplies generated power to a power grid receives a load request value as a power supply command corresponding to the supply and demand state of the power grid from a central load dispatching center that controls the power grid. Since the load request value from the central load dispatching center changes according to the supply and demand state of the power grid, the power plant controls the power generation state based on the change in the load request value.

[0003] This type of power plant is controlled, for example, by PI control in which a predetermined gain and time constant are set based on the deviation between a load request value received from a central load dispatching center and an actual load value obtained at the power plant, so that the actual load value of the power plant follows the load request value. For example, Patent Document 1 discloses a power plant control technology in which a bias value proportional to the deviation between a load request value received from a central load dispatching center, which is an input for PI control, and an actual load value obtained at the power plant is added, thereby improving the responsiveness of the actual load value to changes in the load request value. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 1-257704 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to ensure that the actual load value of a power plant follows changes in the load request value using PI control, it is effective to adjust parameters such as the gain and time constant of the PI control. However, because these control parameters depend on the characteristics of the components of the power plant, changing them requires a major review of the control design of the entire plant, which is not easy. Therefore, Patent Document 1 above does not employ such parameter adjustment, but instead employs a solution in which a bias value is added to the deviation input to the PI controller. However, since Patent Document 1 uses a bias value proportional to the deviation, for example, when the actual load value approaches the load request value (in other words, when the actual load value of the power plant approaches the target load value of the changing load request value), the deviation becomes small, and the bias value also becomes small, making it difficult to obtain the benefits of the bias value.

[0006] Furthermore, in the control of a power plant, in order to ensure that the actual load value reaches the target load value of the load request value, it is sometimes required that the actual load value has a certain degree of overshoot relative to the transition of the load request value. In such cases, it is desirable to appropriately set a bias value to adjust the magnitude of the overshoot. However, with a bias value proportional to the deviation as in Patent Document 1, as described above, the bias value becomes small near the point where the actual load value of the power plant reaches the target load value of the load request value, making it difficult to meet such a requirement.

[0007] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a power plant control device, a power plant control method, and a power plant control program that can suitably adjust the overshoot of an actual load value relative to a load request value in load following control of a power plant. [Means for solving the problem]

[0008] In order to solve the above problem, a power plant control device according to at least one embodiment of the present disclosure includes: a load request value acquisition unit for acquiring a load request value for the power generation plant; an actual load value acquisition unit for acquiring an actual load value of the power generation plant; a bias value calculation unit for calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; a control signal generating unit configured to generate a control signal for the power generation plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with The bias value calculation unit calculates the bias value so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

[0009] In order to solve the above problem, a power plant control method according to at least one embodiment of the present disclosure includes: obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with In the step of calculating the bias value, the bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

[0010] In order to solve the above problem, a power plant control program according to at least one embodiment of the present disclosure includes: On the computer, obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; is executable, In the step of calculating the bias value, the bias value is calculated based on a function that sets the bias value so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero. [Effects of the Invention]

[0011] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and can provide a power plant control device, a power plant control method, and a power plant control program that can suitably adjust the overshoot of an actual load value relative to a load request value in load following control of a power plant. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a schematic configuration of a power plant control device according to an embodiment; [Figure 2] 2 is a diagram showing a function included in a bias value calculation unit shown in FIG. 1; [Figure 3] 1 is a flowchart illustrating a power plant control method according to an embodiment. [Figure 4] 10 is a time chart showing the transition of various signals of a power plant control device when a load request value received from a central load dispatching center behaves in a specific manner. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the configurations described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0014] 1 is a block diagram showing a schematic configuration of a power plant control device 100 according to one embodiment. The power plant control device 100 is a device for controlling the operating state of a power plant (not shown) by transmitting a control signal to the power plant, and the power plant to be controlled is not limited.

[0015] The power plant control device 100 is configured with, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, for example. The CPU reads this program into the RAM or the like and executes information processing and arithmetic operations to realize various functions. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0016] 1, the configuration of the power plant control device 100 is shown corresponding to various functions realized by executing a program. The power plant control device 100 includes a load request value acquisition unit 102, a rate limiting unit 103, an actual load value acquisition unit 104, a bias value calculation unit 106, and a control signal generation unit 108. The configuration shown in FIG. 1 is an example shown to correspond to the functional description given below, and multiple functional blocks may be integrated, or specific functional blocks may be further subdivided.

[0017] The load request value acquisition unit 102 is configured to acquire a load request value Lr for the power plant. The load request value acquisition unit 102 is configured to receive a power supply command according to the supply and demand state of the power system from a central load dispatching center that controls the power system to which the power generated by the power plant is supplied.

[0018] The load request value Lr acquired by the load request value acquisition unit 102 is input to the rate limiting unit 103. When a change in the load request value Lr exceeds a rate limiting value, the rate limiting unit 103 performs limit control so that the change becomes the rate limiting value. As a result, as will be described later with reference to Fig. 4, even when the load request value Lr changes suddenly, a sudden change in the control signal can be prevented and the state of the power plant can be maintained stably.

[0019] The actual load value acquiring unit 104 is configured to acquire an actual load value Lm of the power plant. The actual load value Lm is acquired based on, for example, the results of detecting various sensors installed in the power plant, or control parameters for the power plant, or the results of calculations using those results.

[0020] The bias value calculation unit 106 is configured to calculate a bias value Lb for the load request value Lr based on a first deviation ΔL1 between the load request value Lr and the actual load value Lm. In this embodiment, information about a function fx that defines the relationship between the first deviation ΔL1 and the bias value Lb is stored in advance in a storage device such as a memory (not shown), and the bias value calculation unit 106 inputs the first deviation ΔL1 into the function fx read from the storage device to calculate the corresponding bias value Lb.

[0021] Fig. 2 is a diagram showing the function fx of the bias value calculation unit 106 in Fig. 1. In Fig. 2, the horizontal axis represents the first deviation ΔL1, and the vertical axis represents the bias value Lb.

[0022] The function fx is defined to increase the absolute value of the load request value Lr within a first range R1 in which the first deviation ΔL1 includes zero. The first range R1 is defined as a range in which the absolute value of the first deviation ΔL1 includes zero and is equal to or less than a reference value ΔLref (|ΔL1|≦ΔLref). In this embodiment, the function fx is defined to have a constant bias value Lb within the first range R1. Specifically, within the first range R1, in which the first deviation ΔL1 is in a positive range (0≦ΔL1≦ΔLref), the bias value Lb has a constant first value "+Lb1" (note that "Lb1" is a positive value) regardless of the first deviation ΔL1. On the other hand, within the first range R1, in which the first deviation ΔL1 is in a negative range (-ΔLref≦ΔL1<0), the bias value Lb has a constant first value "-Lb1" regardless of the first deviation ΔL1.

[0023] Furthermore, the function fx defines a bias value Lb such that the absolute value of the load requirement value Lr is larger in a second range R2 (ΔLref<|ΔL1|) where the absolute value of the first deviation ΔL1 is larger than in the first range R1. In this embodiment, the function fx is defined to have a constant bias value Lb in the second range R2. Specifically, in the positive range of the second range R2 (ΔLref<ΔL1), the bias value Lb has a constant second value "+Lb2" regardless of the first deviation ΔL1 (note that "Lb2" is a positive value larger than the first value "Lb1"). On the other hand, in the negative range of the second range R2 where the first deviation ΔL1 is (ΔL1<-ΔLref), the bias value Lb has a constant second value "-Lb2" regardless of the first deviation ΔL1.

[0024] The bias value calculation unit 106 also has a switching unit 107 for switching the output result of the bias value based on the first deviation ΔL1. The switching unit 107 is configured as a switch T for switching between the calculation result of the function fx and a preset default value SG (e.g., zero) as the output result of the bias value calculation unit 106. The switch T is switched so that the calculation result of the function fx is selected when the absolute value of the first deviation ΔL1 is equal to or greater than a threshold, and the default value SG is selected when the absolute value of the first deviation ΔL1 is less than the threshold. FIG. 1 shows, as a configuration for realizing such a switching operation of the switch T, a positive side condition determination unit 109a for performing a condition determination when the first deviation ΔL1 is positive, and a negative side condition determination unit 109b for performing a condition determination when the first deviation ΔL1 is negative.

[0025] 1, the bias value Lb calculated by the bias value calculation unit 106 in this manner is added to the output of the rate limiting unit 103 to become the added load request value La. The control signal generation unit 108 is configured to generate a control signal for the power generation plant based on a second deviation ΔL2 between the added load request value La to which the bias value Lb has been added and the actual load value Lm. The control signal generation unit 108 is configured as, for example, a PI controller, and controls the power generation plant by transmitting a control signal corresponding to the second deviation ΔL2 to the power generation plant.

[0026] Next, a description will be given of a power plant control method implemented by the power plant control device 100 having the above configuration. Fig. 3 is a flowchart showing a power plant control method according to one embodiment.

[0027] First, the power plant control device 100 acquires a load request value Lr received from the central load dispatching center by the load request value acquisition unit 102 (step S1). The load request value acquisition unit 102 inputs the acquired load request value Lr to the rate limiting unit 103, thereby limiting the rate of change of the load request value Lr to be equal to or less than a preset reference value (step S2).

[0028] Next, the actual load value acquisition unit 104 acquires the actual load value Lm of the power plant (step S3). The bias value calculation unit 106 calculates a first deviation ΔL1 between the load request value Lr acquired in step S1 and the actual load value Lm acquired in step S3 (step S4), and calculates a bias value Lb based on the first deviation ΔL1 (step S5). The bias value Lb output from the bias value calculation unit 106 is added to the output of the rate limiting unit 103, thereby calculating a post-addition load request value La (step S6).

[0029] Next, the control signal generator 108 calculates a second deviation ΔL2 between the added load request value La calculated in step S6 and the actual load value Lm acquired in step S3 (step S7), and generates a control signal based on the second deviation ΔL2 (step S8). The control signal is transmitted to the power plant, thereby controlling the power plant (step S9).

[0030] Next, a specific example of the operation of the power plant control device 100 will be described. Fig. 4 is a time chart showing the transition of various signals of the power plant control device 100 when the load request value Lr received from the central load dispatching center behaves in a specific manner. Specifically, Fig. 4 shows the temporal changes of the load request value Lr acquired by the load request value acquisition unit 102, the post-limit load request value Lr' acquired by the rate limiting unit 103, the post-addition load request value La obtained by adding the bias value Lb calculated by the bias value calculation unit 106 to the post-limit load request value Lr', and the actual load value Lm of the power plant acquired by the actual load value acquisition unit 104.

[0031] This example shows a case where the load request value Lr received from the central load dispatching center suddenly increases at time t1. Such a load request value Lr is acquired by the load request value acquisition unit 102 and input to the rate limiting unit 103, whereby the rate of change of the load request value Lr is limited to a preset rate limiting value. Fig. 4 shows the behavior in which the post-limiting load request value Lr', which is the output value of the rate limiting unit 103, gradually increases from time t1 at a predetermined rate of change (rate limiting value) and reaches a second value Lr2 at time t2.

[0032] 4 also shows the transition of the post-addition load request value La, which is the post-limitation load request value Lr' output from the rate limiting unit 103 plus the bias value Lb calculated by the bias value calculating unit 106. At time t1, the first deviation ΔL1 between the load request value Lr and the actual load value Lm is sufficiently large and falls within the second range R2 (ΔL1>ΔLref), so the bias value calculating unit 106 calculates the second value Lb2 corresponding to the first deviation ΔL1 as the bias value using the function fx. As described above with reference to FIG. 2, the second value Lb2 is set to be larger than the first value Lb1 in the function fx. Therefore, by increasing the bias value Lb when the first deviation ΔL1 is large, it is possible to follow the change in the load request value Lr with good responsiveness.

[0033] At time t2, the first deviation Δ1 between the load request value Lr and the actual load value Lm decreases (ΔL1≦ΔLref), causing the function fx to transition from the second range R2 to the first range R1. As a result, the bias value calculation unit 106 calculates a first value Lb1 corresponding to the first deviation ΔL1 as the bias value based on the function fx. As described above with reference to FIG. 2, the first value Lb1 is set smaller than the second value Lb2 in the function fx. Therefore, the added load request value La, to which the bias value Lb has been added, decreases after time t2 compared to before time t2. As the first deviation ΔL1 decreases, the actual load value Lm approaches the load request value Lr. By reducing the magnitude of the bias value Lb, the rate of increase of the actual load value Lm is adjusted so that the actual load value Lm converges to the target load value.

[0034] Then, when the actual load value Lm reaches the load request value Lr at time t3, the bias value calculation unit 106 switches the switch T so that the default value is output as the bias value Lb. As a result, the bias value Lb output from the bias value calculation unit 106 becomes the default value (zero), and the actual load value Lm transitions so as to converge to the load request value Lr while exhibiting a moderate overshoot with respect to the load request value Lr.

[0035] As described above, according to the above embodiment, a control signal for a power plant is generated based on the result of adding the bias value Lb, which is calculated based on the first deviation ΔL1 between the load requirement value Lr and the actual load value Lm, to the load requirement value. The bias value Lb is calculated so as to increase the absolute value of the load requirement value Lr within a first range R1 in which the first deviation ΔL1 includes zero. As a result, a bias value Lb having an effective magnitude can be obtained even within the first range R1 in which the first deviation ΔL1 is relatively small near the point where the actual load value Lm of the power plant reaches the load requirement value Lr. Therefore, by controlling the power plant based on the control signal generated by adding such a bias value Lb, it is possible to suitably adjust the magnitude of the overshoot near the point where the actual load value Lm of the power plant reaches the load requirement value Lr, thereby realizing power plant control that enables the actual load value Lm to accurately reach the load requirement value Lr.

[0036] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate.

[0037] The contents described in each of the above embodiments can be understood, for example, as follows.

[0038] (1) A power plant control device according to one aspect includes: a load request value acquisition unit (102) for acquiring a load request value (Lr) for the power plant; an actual load value acquisition unit (104) for acquiring an actual load value (Lm) of the power plant; a bias value calculation unit (106) for calculating a bias value (Lb) for the load request value based on a first deviation (ΔL1) between the load request value and the actual load value; a control signal generating unit (108) for generating a control signal for the power generation plant based on a second deviation (ΔL2) between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with The bias value calculation unit calculates the bias value so as to increase the absolute value of the load request value within a first range (R1) in which the first deviation includes zero.

[0039] According to the above aspect (1), a bias value calculated based on a first deviation between the load request value and the actual load value is added to the load request value, and a control signal for the power plant is generated based on the result. The bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero. As a result, a bias value having an effective magnitude can be obtained even within the first range in which the first deviation is relatively small near the point where the actual load value of the power plant reaches the load request value. Therefore, by controlling the power plant based on the control signal generated by adding such a bias value, it is possible to suitably adjust the magnitude of overshoot near the point where the actual load value of the power plant reaches the load request value, and to realize power plant control that enables the actual load value to accurately reach the load request value. The actual load value of the power plant can be obtained as, for example, the output value of a generator provided in the power plant. Specific examples of control signals for a power plant include a control signal relating to the amount of fuel input to a gas turbine used in the power plant, a control signal relating to the amount of steam supplied to a steam turbine used in the power plant, or both of these.

[0040] (2) In another embodiment, in the above embodiment (1), The bias value calculation unit is configured to switch the bias value to a default value when the absolute value of the first deviation becomes less than a threshold value (ΔLref).

[0041] According to the above aspect (2), when the absolute value of the deviation between the load request value and the actual load value becomes less than the first threshold value, the bias value is switched to a default value (for example, zero). As a result, by controlling the power plant with a control signal calculated based on the deviation between the original load request value to which the bias value is not added and the actual load value, it is possible to make the actual load value converge with high accuracy to the target load value of the load request value after a moderate overshoot.

[0042] (3) In another aspect, in the above aspect (1) or (2), The bias value has a constant absolute value in the first range.

[0043] According to the above aspect (3), the absolute value of the bias value is calculated to be constant in the first range regardless of the magnitude of the deviation between the load command value and the actual load value. As a result, compared to the case where the bias value has a magnitude proportional to the deviation, a bias value having an effective magnitude can be obtained even in the first range where the first deviation is relatively small in the vicinity of when the actual load value of the power plant reaches the load request value.

[0044] (4) In another embodiment, in any one of the above (1) to (3), The absolute value of the bias value is greater than the first range in a second range (R2) in which the absolute value of the first deviation is greater than the first range.

[0045] According to the above aspect (4), in the second range in which the absolute value of the deviation between the load command value and the actual load value is relatively large, the absolute value of the bias value is also calculated to be large. As a result, when the deviation between the load command value and the actual load value is large (i.e., when the load command value and the actual load value are significantly different from each other), the bias value having a large absolute value is added, thereby improving the responsiveness of the power plant's follow-up control to the load request value.

[0046] (5) In another embodiment, in the above embodiment (4), The bias value has a constant absolute value in the second range.

[0047] According to the above aspect (5), the absolute value of the bias value is calculated to be constant even in the second range, regardless of the magnitude of the deviation between the load command value and the actual load value. This makes it possible to obtain a bias value having an effective magnitude even in the second range, compared to when the bias value has a magnitude proportional to the deviation.

[0048] (6) In another embodiment, in any one of the above (1) to (5), The control signal generating unit calculates the second deviation as the difference between the actual load value and the added load request value (La), which is obtained by adding the bias value to the limited load request value (Lr') that limits the rate of change of the load request value.

[0049] According to the above aspect (6), it is possible to suitably control a power plant that handles a signal generated by limiting the rate of change of a load command to the power plant as a load request value.

[0050] (7) A power plant control method according to one aspect includes: obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with In the step of calculating the bias value, the bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

[0051] According to the above aspect (7), a bias value calculated based on a first deviation between the load request value and the actual load value is added to the load request value, and a control signal for the power plant is generated based on the result. The bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero. As a result, a bias value having an effective magnitude can be obtained even within the first range in which the first deviation is relatively small near the point where the actual load value of the power plant reaches the load request value. Therefore, by controlling the power plant based on the control signal generated by adding such a bias value, it is possible to suitably adjust the magnitude of overshoot near the point where the actual load value of the power plant reaches the load request value, and to realize power plant control that enables the actual load value to accurately reach the load request value. The actual load value of the power plant can be obtained as, for example, the output value of a generator provided in the power plant. Specific examples of control signals for a power plant include a control signal relating to the amount of fuel input to a gas turbine used in the power plant, a control signal relating to the amount of steam supplied to a steam turbine used in the power plant, or both of these.

[0052] (8) A power plant control program according to one aspect includes: On the computer, obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; is executable, In the step of calculating the bias value, the bias value is calculated based on a function that sets the bias value so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

[0053] According to the above aspect (8), a bias value calculated based on a first deviation between the load request value and the actual load value is added to the load request value, and a control signal for the power plant is generated based on the result. The bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero. As a result, a bias value having an effective magnitude can be obtained even within the first range in which the first deviation is relatively small near the point where the actual load value of the power plant reaches the load request value. Therefore, by controlling the power plant based on the control signal generated by adding such a bias value, it is possible to suitably adjust the magnitude of overshoot near the point where the actual load value of the power plant reaches the load request value, and to realize power plant control that enables the actual load value to accurately reach the load request value. The actual load value of the power plant can be obtained as, for example, the output value of a generator provided in the power plant. Specific examples of control signals for a power plant include a control signal relating to the amount of fuel input to a gas turbine used in the power plant, a control signal relating to the amount of steam supplied to a steam turbine used in the power plant, or both of these. [Explanation of symbols]

[0054] 100 Power plant control device 102 Load request value acquisition unit 103 Rate Limiter 104 Actual load value acquisition unit 106 Bias value calculation unit 107 Switching section 108 Control signal generation unit 109a Positive side condition determination section 109b Negative side condition determination section La added load requirement value Lb bias value Lm Actual load value Lr Load requirement value Lr´ limit load requirement R1 First range R2 Second range SG Default Value T-switch fx function

Claims

1. a load request value acquisition unit for acquiring a load request value for the power generation plant; an actual load value acquisition unit for acquiring an actual load value of the power generation plant; a bias value calculation unit for calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; a control signal generating unit configured to generate a control signal for the power generation plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with The bias value calculation unit calculates the bias value so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

2. The power plant control device according to claim 1 , wherein the bias value calculation unit is configured to switch the bias value to a default value when an absolute value of the first deviation becomes less than a first threshold value.

3. The power plant control device according to claim 1 or 2, wherein the bias value has a constant absolute value within the first range.

4. The power plant control device according to claim 1 or 2, wherein the absolute value of the bias value is greater than the first range in a second range in which the absolute value of the first deviation is greater than the first range.

5. The power plant controller of claim 4 , wherein the bias value has a constant absolute value in the second range.

6. 3. The power plant control device according to claim 1, wherein the control signal generating unit calculates the second deviation as a difference between the actual load value and the added load request value obtained by adding the bias value to a limited load request value obtained by limiting a rate of change of the load request value.

7. obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; Equipped with A power plant control method, wherein in the step of calculating the bias value, the bias value is calculated so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

8. On the computer, obtaining a load demand for a power plant; obtaining an actual load value of the power plant; calculating a bias value for the load request value based on a first deviation between the load request value and the actual load value; generating a control signal for the power plant based on a second deviation between an added load request value obtained by adding the bias value to the load request value and the actual load value; is executable, a power plant control program, wherein in the step of calculating the bias value, the bias value is calculated based on a function that sets the bias value so as to increase the absolute value of the load request value within a first range in which the first deviation includes zero.

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