JP7336172B2 - Control device for hydrogen system, hydrogen generation system, and control method for hydrogen system - Google Patents

Description

Embodiments of the present invention relate to a control device for a hydrogen system, a hydrogen generation system, and a control method for a hydrogen system.

A hydrogen system that produces hydrogen using power from a renewable energy power generator is generally known. In such a hydrogen system, hydrogen is produced while adjusting the supply and demand balance of electric power supplied to the electric power system.

On the other hand, it is required to adjust the amount of power supplied to the power system after a predetermined time (for example, after 5 minutes). In this case, it is necessary to adjust the power measured at intervals of 5 minutes, for example, within the predetermined range of the planned power. However, when the storage amount of the hydrogen storage device of the hydrogen system exceeds a predetermined value, control is performed to stop the hydrogen production device. Also, when the storage amount reaches the lower limit, the auxiliary machine may be stopped. As a result, if the hydrogen production device, auxiliary equipment, etc. suddenly stop, fluctuations in the instantaneous power supplied to the power system will increase, and there is a risk that the adjustment of the power supply amount will fail.

JP 2018-85862 A

The problem to be solved by the present invention is a hydrogen system control device capable of adjusting the output power of a renewable energy power generation device according to the storage amount of hydrogen generated by the hydrogen production device, the hydrogen system, and the control of the hydrogen system. to provide a method.

A control device for a hydrogen system according to the present embodiment includes a conversion unit that converts generated power supplied from a renewable energy power generation device into output power, and an input power that is the sum of the output power and power supplied from a power system. a hydrogen system control device that controls a hydrogen production device that produces and a control unit that controls the conversion unit to adjust the output power based on the above.

According to this embodiment, it is possible to adjust the output power of the renewable energy power generation device according to the storage amount of hydrogen generated by the hydrogen production device.

A block diagram showing the configuration of a hydrogen system. FIG. 2 is a block diagram showing the configuration of a control device; A diagram showing an example of control by the control unit during the supply and demand adjustment period FIG. 10 is a diagram for explaining the influence of input power on instantaneous power at the time of stop; The figure which shows the example of control in the case of suppressing the amount of hydrogen production. The figure which shows the example which calculates a change amount according to a hydrogen storage tank pressure. The figure which shows the example controlled by the variation|change_quantity shown in FIG. 4 is a flowchart showing an example of control; The block diagram of the control apparatus which concerns on 2nd Embodiment. FIG. 5 is a diagram showing an example of control using corrected input power and output power; The block diagram of the control apparatus which concerns on 3rd Embodiment.

Hereinafter, a hydrogen system control device, a hydrogen generation system, and a hydrogen system control method according to embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of embodiments of the present invention, and the present invention should not be construed as being limited to these embodiments. In addition, in the drawings referred to in this embodiment, the same reference numerals or similar reference numerals are given to the same portions or portions having similar functions, and repeated description thereof may be omitted. Also, the dimensional ratios in the drawings may differ from the actual ratios for convenience of explanation, and some of the configurations may be omitted from the drawings.
(First embodiment)

FIG. 1 is a block diagram showing the configuration of a hydrogen generation system 1 according to the first embodiment. As shown in FIG. 1 , the hydrogen generation system 1 according to this embodiment is a system for generating hydrogen, and includes a hydrogen system 10 , an energy management system 20 and a control device 30 . FIG. 1 also shows the power system Eps. The power system Eps is, for example, a power transmission and distribution network managed by an electric power company.

The hydrogen system 10 supplies power generated by the renewable energy power generators in the hydrogen system 10 to the electric power system Eps. In addition, the hydrogen system 10 produces hydrogen using part of the generated power. Details of the hydrogen system 10 will be described later.

The energy management system 20 is a system that creates an operation plan for the hydrogen system 10 . The operation plan is generally a 48-part operation plan obtained by dividing one day into 30-minute units. For example, the energy management system 20 outputs to the control device 30 a command signal including information such as the target amount of power received from the power system Eps for each time interval, the predicted power generated by the renewable energy power generation device, and the amount of hydrogen produced. When the target received power amount is plus (+), it means receiving power, and when it is minus (-), it means selling power, that is, reverse power flow.

The control device 30 is a control device that controls the hydrogen system 10 based on the operation plan created by the energy management system. Details of the control device 30 will be described later.

Here, the configuration of the hydrogen system 10 will be described. The hydrogen system 10 has a renewable energy power generation device 10a, a power conditioner 10b, a hydrogen production device 10c, a hydrogen storage device 10d, and an auxiliary machine 10e. FIG. 1 also shows the hydrogen load HR.

The renewable energy power generation device 10a has power generation equipment derived from natural energy. This renewable energy-derived power generation facility is, for example, a photovoltaic power generation device using sunlight. The renewable energy power generation device 10a outputs to the control device 30 a measurement signal including information on the AC power value of the generated power Pv.

The renewable energy power generation device 10a does not require fuel such as fossil fuel, but its power generation is unstable because it is affected by the environment such as the weather. The renewable energy power generator 10a may be a wind power generation facility, or a power generation facility using new energy such as biomass or biomass-derived waste.

The power conditioner 10b includes, for example, a converter. This converter converts, for example, the DC power Pv output by the renewable energy power generator 10a into AC output power Pcs(k). More specifically, power conditioner 10b converts generated power Pv(k) into a predetermined value in accordance with a command signal that is input from control device 30 and includes information on output power Pcs(k). is supplied to the hydrogen production device 10c. That is, the control device 30 adjusts the magnitude of the output power Pcs(k) output by the power conditioner 10b. Note that the power conditioner 10b according to the present embodiment corresponds to the conversion section. where k means time.

The hydrogen production device 10c produces hydrogen by water electrolysis using the electricity supplied to the rectifier and water. The hydrogen production device 10c produces hydrogen from an input power E that is a part of power obtained by combining the output power Pcs output from the power conditioner 10b and the instantaneous power P supplied from the power system Eps. The hydrogen production device 10c is an electrolysis device that produces hydrogen and oxygen, for example, by passing an electric current through an alkaline solution. Furthermore, the hydrogen production device 10c stores the generated hydrogen amount H(k) in the hydrogen storage device 10d via the hydrogen pipe.

The hydrogen storage device 10d stores the hydrogen produced by the hydrogen production device 10c. This hydrogen storage device 10d has, for example, a hydrogen storage tank. Information on the hydrogen pressure in the hydrogen storage tank is also output to the control device 30 .

The hydrogen storage device 10d is connected to the hydrogen production device 10c and the hydrogen load HR via piping. In addition, the hydrogen storage device 10d supplies hydrogen to the hydrogen load HR through piping. The hydrogen load HR is, for example, a fuel cell power generator, a fuel cell vehicle, or the like. Note that the renewable energy power generator 10 a and the power conditioner 10 b may be arranged outside the hydrogen system 10 . That is, the hydrogen system 10 may be configured without the renewable energy power generator 10a and the power conditioner 10b.

Auxiliary device 10e is a device required for hydrogen production device 10c to produce hydrogen. For example, it is a pump that supplies water to the hydrogen production device 10c. These include the air conditioning equipment of the hydrogen production device 10c, the compressor of the hydrogen storage tank in the hydrogen storage device 10d, and the like. The auxiliary machine 10e is driven by, for example, auxiliary machine power Ap, which is a part of the combined power of the output power Pcs output by the power conditioner 10b and the instantaneous power P supplied from the power system Eps.

FIG. 2 is a block diagram showing the configuration of the control device 30. As shown in FIG. As shown in FIG. 2, the control device 30 has a storage section 30a, an interface section 30b, and a control section 30c.

The storage unit 30a is implemented by, for example, a RAM (Random Access Memory), a semiconductor memory device such as a flash memory, a hard disk, or the like. The storage unit 30a stores programs executed by the control unit 30c and various control data.

The interface unit 30b communicates with the renewable energy power generation device 10a (FIG. 1), the hydrogen production device 10c (FIG. 1), the hydrogen storage device 10d (FIG. 1), and the energy management system 20 (FIG. 1). As a result, the interface unit 30b converts the instantaneous power P(k), the generated power Pv(k), the output power Pcs(k), the hydrogen production amount H(k), and the hydrogen storage amount Hs(k) into hydrogen Obtained from system 10 . The hydrogen storage amount Hs(k) means the storage amount in the hydrogen storage tank of the hydrogen storage device 10d.

For example, the hydrogen storage amount Hs(k) is converted according to the pressure in the hydrogen storage tank. Also, the hydrogen storage tank is set with an upper limit pressure for hydrogen storage. For example, the upper pressure limit is 0.8 MPa. The interface unit 30b also acquires information on the supply and demand adjustment time period, the base power, and the target output change amount ΔkW from the energy management system 20 .

The control unit 30c includes, for example, a CPU (Central Processing Unit), and executes control based on a program stored in the storage unit 30a. This control unit 30 c has a calculation unit 302 and an output unit 304 . The calculation unit 302 has a hydrogen production suppression amount calculation unit 306 and a command value calculation unit 308 .

Based on the information on the supply and demand adjustment time period, the base power, and the output change amount ΔkW, the calculation unit 302 calculates the hydrogen production amount H(k), the input power E(k), the output power Pcs(k), the instantaneous power P(k ). The hydrogen production amount H(k) and the input electric power E(k) have the relationship shown in the formula (1), for example, and the input electric power E(k) can be calculated from the hydrogen production amount H(k).
H(k)=η×E(k) (1)
The instantaneous power P(k) is, for example, a value obtained by subtracting the output power Pcs(k) from the sum of the input power E(k) and the auxiliary power Ap(k).

The output unit 304 outputs a first command value having information on the input power E(k) based on the hydrogen production amount H(k) to the hydrogen production device 10c, and outputs a second command value having information on the output power Pcs(k). The value is output to the power conditioner 10b. The hydrogen generator 10c and the power conditioner 10b are controlled according to these first command value and second command value.

FIG. 3 is a diagram showing a control example of the control unit 30c during the supply and demand adjustment time period. The figure below shows the relationship between expected demand and actual demand. In the figure below, the vertical axis indicates the amount of electricity demanded, and the horizontal axis indicates time. A line L10 indicates the time-series value of the actual power demand. Further, the horizontal bar B10 indicates the estimated power demand assumed in advance by the business operator, and the horizontal bar B12 indicates the actual power demand. In other words, the figure below shows that the actual demand is less than the expected demand for electricity assumed by the business operator.

Here, the supply and demand adjustment time period means a time period in which the energy management system 20 issues a supply and demand adjustment command. The supply and demand adjustment command is a command to change the instantaneous power P from the current base power to the target output change amount ΔkW. It is not decided when the command will come in the supply and demand adjustment time zone, and if the command for supply and demand adjustment does not come, it is necessary to stand by in a state where the supply and demand adjustment can be performed. Base power means instantaneous power P in this standby state. The upper diagram in FIG. 3 corresponds to the instantaneous electric power P before the command value is issued.

In the upper diagram of FIG. 3, the vertical axis indicates the absolute value of the difference between the horizontal bar B10 and the horizontal bar B12 when the value of the horizontal bar B10 is 0, and the horizontal axis indicates time. The command value is a value obtained by adding the output change amount ΔkW to the base power. That is, the line L20 indicates the absolute value of the difference between the horizontal bar B10 and the horizontal bar B12 when the value of the horizontal bar B10 is set to 0.

As shown in the upper diagram of FIG. 3, it is necessary to keep the instantaneous electric power P measured at 5-minute intervals within ±10% of the output change amount ΔkW during the supply and demand adjustment period. In other words, the control unit 30c needs to control the instantaneous electric power P within ±10% of the output change amount ΔkW during the supply and demand adjustment time period. In this way, the power change amount is evaluated during the supply and demand adjustment time period.

For example, 180 minutes is set as the pre-examination time before entering the supply and demand adjustment period. For example, 60 minutes is set before the pre-examination time. This 60 minutes generally includes response time. The response time is the time from when the supply and demand adjustment command is issued until the instantaneous power P reaches the command value from the base power. The pre-screening time and the previous 60 minutes are collectively referred to as the pre-screening time. During the preliminary examination time, it is examined whether or not the output power measured at 5-minute intervals can be kept within ±10% of the amount of change in output ΔkW. Response time is also examined, and the higher the rating, the faster it goes from base power to the command value. As described above, during the pre-examination time, the control section 30c needs to control the instantaneous power P to within ±10% of the output change amount ΔkW.

Here, details of the calculation unit 302 will be described. In particular, an example of control for suppressing the influence of the input power E(k) when the hydrogen production device 10c is stopped in order to control the instantaneous power P within the output change amount ΔkW within ±10% during the supply and demand adjustment period will be described.

First, the effect of the input power E(k) on the instantaneous power P(k) when the hydrogen production device 10c is stopped will be described with reference to FIG. FIG. 4 is a diagram for explaining the influence of the input power E(k) on the instantaneous power P(k) when the hydrogen production device 10c is stopped. The vertical axis indicates pressure and power in the hydrogen storage tank, and the horizontal axis indicates time k.

Under the control of the control unit 30c, the input power E(k), the auxiliary power Ap(k), and the output power Pcs(k) are constant until time k−1, and the instantaneous power P(k) is kept at a predetermined value (base power + output change amount ΔkW). However, at time k, the hydrogen storage tank pressure reaches the upper limit pressure (0.8), and the hydrogen production device 10c stops. As a result, the input power E(k) abruptly becomes zero. In this way, when the hydrogen production device 10c suddenly stops, the control for reducing the output power Pcs(k) by the control unit 30c lags behind the reduction of the input power E(k), and the instantaneous power P(k) reaches a predetermined level. The power of the value (base power + output change amount ΔkW) cannot be maintained.

For this reason, the calculation unit 302 adjusts the hydrogen production amount H(k) and the output power Pcs (k) is calculated. For example, when the hydrogen storage amount of the hydrogen storage device 10d exceeds a predetermined value, the calculation unit 302 increases the input power E(k) and the output power Pcs(k ) is reduced, the input power E(k) and the output power Pcs(k) are calculated.

The output unit 304 outputs a first command value based on the hydrogen production amount H(k) to the hydrogen production device 10c, and outputs a second command value based on the output power Pcs(k) to the power conditioner 10b.

A hydrogen production suppression amount calculation unit 306 calculates a change amount ΔH(k) of the hydrogen production amount H(k) that suppresses the hydrogen production amount according to the hydrogen storage tank pressure. For example, when the hydrogen storage tank pressure exceeds a predetermined value, the hydrogen production suppression amount calculation unit 306 calculates a constant change amount ΔH(k) for decreasing the hydrogen production amount H(k). For example, the hydrogen production suppression amount calculation unit 306 determines the time at which the input power E(k) becomes 0 as the input power E(k) gradually decreases and the hydrogen production device 10c stops, and the time at which the hydrogen storage tank is full, that is, the amount of change .DELTA.H(k) of a constant value is calculated so that the timing of reaching the upper limit pressure coincides.

The command value calculation unit 308 calculates a reduction amount ΔE ( k). For example, the hydrogen production amount H(k) and the input electric power E(k) have the relationship of the formula (1) as described above. The command value calculation unit 308 can calculate the decrease amount ΔE(k) of the input electric power using the equation (2).
ΔE(k)=ΔH(k)/η (2)

In addition, in the present embodiment, the calculation unit 302 calculates the amount of change ΔH(k) in the hydrogen production amount H(k), but is not limited to this. For example, the input power decrease amount ΔE(k) may be directly calculated without using ΔH(k).

Command value calculator 308 matches the amount of decrease ΔE(k) in input power E(k) with the amount of decrease in output power Pcs(k) in order to keep instantaneous power P constant. For example, command value calculator 308 matches the amount of decrease in output power Pcs(k) with the amount of decrease ΔE(k) in input power E(k). In this case, command value calculator 308 calculates input power E(k) and output power Pcs(k) according to equations (3) and (4).
E(k)=E(k−1)−ΔE(k) (3)
PCS(k)=PCS(k-1)-ΔE(k) (4)

By such arithmetic processing, the instantaneous power P(k), which is the difference between Pcs(k) and E(k), is maintained at a constant value. In addition, for example, when the input power E(k) is systematically reduced, the input power E(k) becomes 0, and the time when the hydrogen production device 10c stops and the time when the hydrogen storage tank is full. match.

The output unit 304 outputs the first command value having the information of the indicated value PCSset(k) of the output power Pcs(k) to the hydrogen production device 10c, and the information of the indicated value Eset(k) of the input power E(k). to the power conditioner 10b.

FIG. 5 is a diagram showing a control example when suppressing the hydrogen production amount H(k). The vertical axis of FIG. 5 indicates the pressure and power of the hydrogen storage tank, and the horizontal axis indicates time k.

In the control example shown in FIG. 5, when the hydrogen storage tank pressure reaches the threshold value (0.6) at time k−3, the hydrogen production suppression amount calculation unit 306 determines the time point at which the hydrogen production device 10c stops and the hydrogen storage tank The amount of change ΔH(k) in the hydrogen production amount H(k) is calculated so that the timing at which H(k) becomes full coincides. Subsequently, command value calculation unit 308 calculates input power E(k) and output power Pcs(k) according to formulas (1) to (4). After the storage tank pressure reaches the threshold (0.6), the input power E(k) and the output power Pcs(k) decrease in power by ΔE(k). Therefore, the instantaneous power P(k), which is the difference between the output power Pcs(k) and the input power E(k), is maintained at a constant value.

Further, the accessory power Ap(k), which is the power consumption of the accessory, is maintained at a constant value. In this way, after the storage tank pressure reaches the threshold value (0.6), the change amount ΔE(k) of the input power E(k) with respect to time and the change amount ΔE(k) of the output power Pcs(k) with respect to time k) and reduce the hydrogen production rate H(k) and the output power Pcs(k). As a result, even when the hydrogen storage tank pressure reaches the upper limit pressure (0.8), the instantaneous power P, which is the difference between the output power Pcs(k) and the input power E(k), is maintained at a constant value. . Also, the input power E(k) and the output power Pcs(k) are reduced by the same ΔE(k), and the input power By setting E(k) to 0, the instantaneous electric power P can be maintained at a constant value even when the hydrogen production device 10c is stopped. In this way, the input power E(k) is set to 0 while following the time-series change in the output power Pcs(k) with respect to the time-series change in the input power E(k). The effect of fluctuations in the input power E(k) at the time of stoppage on the instantaneous power P(k) is suppressed. Furthermore, it is also possible to prioritize hydrogen production before the storage tank pressure reaches a threshold (0.6).

FIG. 6 is a diagram showing an example of calculating the amount of change ΔH(k) according to the pressure of the hydrogen storage tank. The vertical axis indicates the amount of change ΔH(k), and the horizontal axis indicates the pressure.

In the example of FIG. 5, the hydrogen production suppression amount calculator 306 calculates the amount of change ΔH(k) of a constant value, but in the example of FIG. 6, the amount of change ΔH(k) is calculated according to the hydrogen storage tank pressure. The difference is that When the water change amount ΔH(k) is calculated with a constant magnitude when the threshold value (0.6) is reached, the change in the hydrogen storage tank pressure may differ from the expected change due to an environmental change or the like. On the other hand, if the amount of change ΔH(k) is calculated according to the hydrogen storage tank pressure, the amount of change ΔH(k) can be adjusted according to the pressure. It is possible to further improve the accuracy of the control for matching the stop time of the hydrogen production device 10c.

FIG. 7 is a diagram showing an example of control with a change amount ΔH(k) according to the pressure of the hydrogen storage tank shown in FIG. The vertical axis indicates pressure and power in the hydrogen storage tank, and the horizontal axis indicates time k.

In this example, the command value calculation unit 308 calculates the input electric power E(k) and the output electric power Pcs(k) according to the equations (3) and (4) using the amount of change ΔH(k) corresponding to the pressure. As shown in FIG. 7, hydrogen can be produced up to the upper limit (0.8) of the hydrogen storage tank pressure by controlling the amount of change ΔH(k) according to the pressure. That is, the time when the hydrogen production device 10c is stopped coincides with the time when the pressure in the hydrogen storage tank reaches the upper limit (0.8).

FIG. 8 is a flowchart showing a control example of the control device 30. As shown in FIG. As shown in FIG. 8, the interface unit 30b first acquires from the energy management system 20 a plan value including information on the supply and demand adjustment time period, base power, and target output change amount ΔkW (step S100).

Next, the interface unit 30b converts the instantaneous power P(k), the generated power Pv(k), the output power Pcs(k), the hydrogen production amount H(k), and the hydrogen storage amount Hs(k) into hydrogen Acquired from the system 10 (step S102).

Next, the control unit 30c determines whether or not it is the supply and demand adjustment time period based on the acquired information on the planned value (step S102). If it is determined that it is not the supply and demand adjustment period (NO in step S102), the command value calculation unit 308 adjusts the input power E(k) and the output power Pcs(k ) is calculated (step S104). In this case, the hydrogen production amount H(k) follows the planned value.

On the other hand, if the control unit 30c determines that it is the supply and demand adjustment time period (YES in step S104), it determines whether the pressure of the hydrogen storage tank of the hydrogen storage device 10d is equal to or higher than a predetermined value (for example, 0.6). (step S108). If it is determined that the pressure is less than the predetermined value (NO in step S108), the command value calculator 308 adjusts the input power E(k ) and the output power Pcs(k) (step S110). In this case, the hydrogen production amount H(k) follows the planned value.

On the other hand, when the control unit 30c determines that the pressure is equal to or higher than the predetermined value (YES in step S106), the hydrogen production suppression amount calculation unit 306 calculates the change amount ΔH(k) for suppressing the hydrogen production amount in time series. Calculate (step S104). Subsequently, based on the change amount ΔH(k), the command value calculation unit 308 calculates the input power E(k) and the output power Pcs( k) is calculated (step S114).

Next, the output unit 304 outputs the first command value having the information of the input power E(k) based on the hydrogen production amount H(k) to the hydrogen production device 10c, and has the information of the output power Pcs(k). A second command value is output to the power conditioner 10b (step S116).

Next, the control unit 30c determines whether or not the termination condition is satisfied (step S118). When determining that the end condition is satisfied (YES in step S118), the control unit 30c ends the overall process. On the other hand, when determining that the end condition is not satisfied (NO in step S118), the control unit 30c repeats the processing from step S100.

In the present embodiment, suppression of the hydrogen production amount with respect to the upper limit of the hydrogen storage tank pressure has been described, but similar processing may be performed for the lower limit of the hydrogen storage tank pressure. For example, when the pressure of the hydrogen storage tank approaches the lower limit, the amount of hydrogen production H(k) may be increased, and the amount of increase in the input power accompanying the increase in the amount of hydrogen production may be used as the amount of increase on the renewable energy side. . This makes it possible to avoid stopping the compressor when the pressure of the hydrogen storage tank reaches the lower limit, for example when it becomes empty, and the instantaneous electric power can be kept constant.

As described above, according to the present embodiment, the control unit 30c controls the power conditioner 10b to adjust the output power Pcs(k) based on the hydrogen storage information regarding the storage amount of the hydrogen storage device 10d, that is, the pressure. conduct. This makes it possible to control the output power Pcs(k) according to the storage amount of the hydrogen storage device 10d. Therefore, the output power Pcs(k) can be reduced in advance before the storage amount of the hydrogen storage device 10d reaches the upper limit, and the output power Pcs(k) can be increased in advance before the storage amount reaches the lower limit.

In addition, based on the hydrogen storage information about the storage amount of the hydrogen storage device 10d, the control unit 30c controls the hydrogen production device 10c so that the input power E(k) approaches 0, and the output power Pcs(k ) is performed on the power conditioner 10b. As a result, the input electric power E(k) when the hydrogen production device 10c is stopped is reduced, so that fluctuations in the instantaneous electric power P(k) can be suppressed. In particular, by setting the input power E(k) to 0 in time series, the instantaneous power P can be maintained at a constant value even when the hydrogen production device 10c is stopped.

(Modified example of the first embodiment)
The command value calculation unit 308 also uses the information on the auxiliary power Ap(k) acquired by the interface unit 30b to calculate the input power E(k) and the output power Pcs(k) according to Equation (4A). Auxiliary power change amount Δaux(k) is a difference value between Ap(k) and Ap(k−1).

Pcs(k)=Pcs(k-1)-ΔE(k)+Δaux(k) (4A)
As a result, the output power Pcs(k) can be calculated with higher accuracy even when the auxiliary power Ap(k) changes.
(Second embodiment)
The hydrogen generation system 1 according to the second embodiment corrects the input electric power E(k) and the output electric power Pcs(k) using the hydrogen supply amount Hout(k) supplied to the hydrogen load HR. It is different from the hydrogen generation system 1 according to the embodiment. Differences from the hydrogen generation system 1 according to the first embodiment will be described below.

FIG. 9 is a block diagram of the control device 30 according to the second embodiment. As shown in FIG. 9 , the control device 30 further has a command value correction section 310 .

The interface unit 30b further acquires the hydrogen supply amount Hout(k) to be supplied to the hydrogen load HR.
Command value correction unit 310 calculates a command value by correcting the command value calculated by command value calculation unit 308 using hydrogen supply amount Hout(k).
The output unit 304 outputs the corrected command value calculated by the command value correction unit 310 to each device.

More specifically, command value correction unit 310 limits input power E(k) to calculate input power E(k) and output power Pcs(k). For example, the input power limit value Emin(k) calculated based on the hydrogen supply amount Hout(k) is calculated by equation (5).
Emin(k)=η×Hout(k) (5)
The command value correction unit 310 calculates the force power E(k) corrected by the equation (6).
E(k)=max(E(k), Emin(k)) (6)
As a result, when the hydrogen supply amount Hout(k) is maintained, hydrogen production for at least the input power limit value Emin(k) can be maintained.

Also, the output power Pcs(k) can be calculated by the formula (7) because it is sufficient to set the amount of change to be the same as the input power E(k) corrected by the formula (6).
Pcs(k)=Pcs(k-1)-(E(k)-E(k-1)) (7)

The output unit 304 outputs the first command value having the information of the indicated value PCS_set(k) of the output power Pcs(k) to the hydrogen production device 10c, and the information of the indicated value Eset(k) of the input power E(k). to the power conditioner 10b.

FIG. 10 is a diagram showing an example of control by corrected input power E(k) and output power Pcs(k). The vertical axis indicates pressure and power in the hydrogen storage tank, and the horizontal axis indicates time k.

As shown in FIG. 10, an input power limit value Emin(k) limits the possible reduction of the input power E(k). When the input electric power E(k) is restricted, the amount of hydrogen entering the hydrogen storage tank from the hydrogen production device 10c matches the amount of hydrogen flowing out of the hydrogen storage tank to the hydrogen load HR.

As described above, in the present embodiment, the range in which the input power E(k) can be reduced is limited by the input power limit value Emin(k) calculated using the hydrogen supply amount Hout(k). As a result, hydrogen production by the hydrogen production device 10c is continued, and stoppage of the hydrogen production device 10c in a state where hydrogen production is possible can be avoided.

(Third embodiment)
The hydrogen generation system 1 according to the third embodiment estimates the pressure of the hydrogen storage tank and calculates the input power E(k) and the output power Pcs(k), thereby obtaining the hydrogen generation system according to the second embodiment. different from 1. Differences from the hydrogen generation system 1 according to the second embodiment will be described below.

FIG. 11 is a block diagram of the control device 30 according to the third embodiment. As shown in FIG. 11 , the control device 30 further has a hydrogen storage tank pressure estimating section 312 and a setting parameter changing section 314 .

The interface unit 30b further acquires the future outside air temperature Tamb(k).
The hydrogen storage tank pressure estimation unit 312 estimates the future force Prh(k+1) using the hydrogen storage tank pressure Prh(k) and the future outside air temperature Tamb(k). The estimation method may be a method using a physical formula or a statistical method such as machine learning.

The setting parameter changing unit 314 uses the estimated change amount ΔP(k+1) of the pressure Prh(k) to set the change amount ΔH(k) for decreasing the hydrogen storage tank pressure threshold and the hydrogen production amount H(k). Change parameters. For example, if the amount of change ΔP(k+1) is expected to increase, the setting parameters are changed so as to increase the amount of change ΔH(k). Conversely, if the amount of change ΔP(k+1) is expected to decrease, the setting parameters are changed so as to make the amount of change ΔH(k) smaller. This makes it possible to control the hydrogen production amount H(k) in which the response speed is made to correspond to the amount of change ΔP(k+1).

For example, the amount of change ΔH(k) is a value obtained by dividing the amount of hydrogen production H(k) by the parameter Pt1, and if the amount of change ΔP(k+1) is expected to increase, the parameter Pt1 is made smaller. Conversely, if the variation ΔP(k+1) is expected to decrease, the parameter Pt1 is increased.

Further, in the present embodiment, the threshold Th is calculated by Th=0.6−Pt2×variation amount ΔP(k+1) using the parameter Pt2, for example. As a result, for example, when an increase in the amount of change ΔP(k+1) is predicted, the setting parameter Pt2 is changed so as to lower the threshold Th. Conversely, if the amount of change ΔP(k+1) is predicted to decrease, the setting parameter Pt2 is changed so as to increase the threshold Th. As a result, it is possible to perform control in which the timing of starting suppression of the hydrogen production amount H(k) is made to correspond to the amount of change ΔP(k+1).

The hydrogen production suppression amount calculation unit 306 uses the parameters Pt1 and Pt2 changed by the setting parameter change unit 314 to reduce the hydrogen storage tank pressure threshold and the hydrogen production amount H(k) corresponding to the hydrogen storage tank pressure. A change amount ΔH(k) is calculated.

Here, the details of the hydrogen storage tank pressure estimator 312 will be described. First, using the capacity Hmax of the hydrogen storage tank, the current amount of hydrogen in the hydrogen storage tank Htank(k), and the current outside air temperature Tamb(k), the current hydrogen storage tank pressure P(k) is calculated by equation (8). estimated by
P(k)=(Htank(k)×0.1013×(273+Tamb(k)))/(Hmax×273)−0.1013 (8)

Next, the hydrogen storage tank pressure estimator 312 uses the future outside air temperature Tamb(k+1) to estimate the future hydrogen storage tank pressure Ppre(k+1) by Equation (9).
Ppre(k+1)=(Htank(k)×0.1013×(273+Tamb(k+1)))/(Hmax×273)−0.1013 (9)

That is, the amount of future hydrogen storage tank pressure change ΔP(k+1) due to the change in the outside air temperature can be calculated by the formula (10).
ΔP(k+1)=P_pre(k+1)−P(k) (10)

The setting parameter changing unit changes the setting parameters Pt1 and Pt2 using the future pressure change amount ΔP(k+1) of the hydrogen storage tank calculated by the equation (10).

As described above, according to the present embodiment, the amount of change ΔP(k+1) in the hydrogen storage tank pressure due to the temperature rise is estimated using the future outside air temperature, and the hydrogen storage tank pressure is calculated according to the amount of change ΔP(k+1). The threshold value of the pressure and the change amount ΔH(k) for decreasing the hydrogen production amount H(k) are changed. This makes it possible to reflect changes in temperature in the control in advance. Therefore, even when environmental fluctuations such as the outside air temperature are large, it is possible to prevent the hydrogen production device 10c from suddenly stopping with a higher degree of accuracy.

Although several embodiments have been described above, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. The novel apparatus, methods and programs described herein can be embodied in various other forms. In addition, various omissions, substitutions, and modifications can be made to the forms of the devices, methods, and programs described herein without departing from the spirit of the invention.

1: Hydrogen generation system, 10: Hydrogen system, 10a: Renewable energy generator, 10b: Power conditioner, 10c: Hydrogen production device, 10d: Hydrogen storage device, 10e: Auxiliary device, 30: Control device, 30b: Interface Section 30c: Control Section 302: Calculation Section 304: Output Section Eps: Power system.

Claims (11)

controlling a conversion unit that converts generated power supplied from a renewable energy power generation device into output power, and a hydrogen production device that produces hydrogen from input power obtained by adding the output power and power supplied from a power system; A controller for a hydrogen system, comprising:
an acquisition unit that acquires hydrogen storage information about a storage amount of a hydrogen storage device that stores hydrogen produced by the hydrogen production device;
a control unit that controls the conversion unit to adjust the output power based on the hydrogen storage information ;
The control unit
a computing unit that computes the input power and the output power so that both the input power and the output power decrease or increase;
The calculation unit calculates the input power and the output power such that the amount of change in the input power with respect to time and the amount of change in the output power with respect to time match.
Hydrogen system controller. 2. The control device for a hydrogen system according to claim 1, wherein said control unit controls said conversion unit to suppress said output power and controls said hydrogen production device to suppress a hydrogen production amount. When the amount of hydrogen stored in the hydrogen storage device exceeds a predetermined value, the calculation unit reduces the input power and the output power as the amount of hydrogen stored in the hydrogen storage device increases. calculating the power and the output power;
The control unit
2. The control of the hydrogen system according to claim 1 , further comprising an output unit for outputting a first command signal based on said input power to said hydrogen production device and outputting a second command signal based on said output power to said conversion unit. Device. When power within a predetermined range is supplied from the renewable energy power generation device to the electric power system, the computing unit determines whether the input power is 0 when the hydrogen production device is stopped or before the hydrogen production device is stopped. 2. The control device for a hydrogen system according to claim 1 , which calculates so as to approach . The hydrogen storage information is the pressure in a hydrogen storage tank of the hydrogen storage device,
5. The hydrogen system control device according to claim 3, wherein the calculation unit performs calculations so as to change the input power and the output power in time series according to the magnitude of the pressure. The acquisition unit acquires a hydrogen supply amount supplied from the hydrogen storage device,
The hydrogen system control device according to any one of claims 3 to 5 , wherein the calculation unit calculates the input power and the output power based on the hydrogen supply amount. The acquisition unit acquires a planned value for the amount of hydrogen to be supplied from the hydrogen storage device,
The hydrogen system control device according to any one of claims 3 to 6 , wherein said calculation unit calculates said input power and said output power based also on said planned value. The control unit
a pressure estimating unit for estimating a variation in the pressure in the hydrogen storage tank based on the pressure in the hydrogen storage tank and the outside air temperature of the hydrogen storage device;
6. The control device for a hydrogen system according to claim 5 , wherein said calculation unit calculates said input power and said output power based on said pressure fluctuation amount. The acquisition unit also acquires information on auxiliary machine power driven using part of the output power,
4. The control device for a hydrogen system according to claim 3, wherein said computing unit computes said input power and said output power based on a variation amount of said auxiliary power. a renewable energy generator;
a conversion unit that converts the power supplied from the renewable energy power generation device into output power;
a hydrogen production device that produces hydrogen from input power that is the sum of the output power and power supplied from a power system;
A hydrogen generation system comprising a hydrogen system control device that controls the conversion unit and the hydrogen production device,
The control device is
an acquisition unit that acquires hydrogen storage information about a storage amount of a hydrogen storage device that stores hydrogen produced by the hydrogen production device;
a control unit that controls the conversion unit to adjust the output power based on the hydrogen storage information ;
The control unit
a computing unit that computes the input power and the output power so that both the input power and the output power decrease or increase; and a computing unit that computes the input power and the output power. ,
The calculation unit calculates the input power and the output power such that the amount of change in the input power with respect to time and the amount of change in the output power with respect to time match.
Hydrogen generation system. A hydrogen system that controls a conversion unit that converts power supplied from a renewable energy power generation device into output power, and a hydrogen production device that produces hydrogen from input power obtained by adding the output power and power supplied from a power system. A control method of
an acquisition step of acquiring hydrogen storage information about the storage amount of a hydrogen storage device that stores hydrogen produced by the hydrogen production device;
a control step of controlling the conversion unit to adjust the output power based on the hydrogen storage information ;
The control step includes
a computing step of computing the input power and the output power such that both the input power and the output power decrease or increase ;
The calculating step calculates the input power and the output power such that the amount of change in the input power with respect to time and the amount of change in the output power with respect to time match.
How to control the hydrogen system.

Images