JP2020198686A - Control apparatus for hydrogen production system and control method for hydrogen production system - Google Patents

Abstract

To provide a control apparatus for a hydrogen production system that is capable of adjusting use of generated power in a renewable energy power generation device so as to achieve conflicting objects, and a control method for the hydrogen production system.SOLUTION: A control apparatus for a hydrogen production system comprises: a determination unit that determines a weight parameter for each of a first target input power which is a target of a first power, and at least one of a target hydrogen production amount and a second target input power which is a target of a second power; a calculation unit that calculates an input power of the first power, and at least one of a hydrogen production amount and an input power of the second power with higher priority as the weight parameter corresponding to each of them increases, and calculates a first power input instruction value indicating an input power; and an output unit that outputs a command signal including information on the first power input instruction value. The determination unit changes the weight parameter in accordance with a change in a physical quantity related to the hydrogen production amount of the hydrogen production system.SELECTED DRAWING: Figure 2

Description

An embodiment of the present invention relates to a control device for a hydrogen production system and a control method for the hydrogen production system.

A hydrogen production system that produces and stores hydrogen using the generated power generated by a renewable energy power generation device whose amount of power generation fluctuates greatly and the power supplied from the power system is known. In addition, the supply and demand balance of electric power supplied from the electric power system is adjusted, and the development of an energy management system for producing the amount of hydrogen that satisfies the hydrogen demand is underway. The control device of this hydrogen production system receives a request for a balance between supply and demand from the energy management system, and in order to achieve this, it is necessary to appropriately control each device. As described above, the control device of the hydrogen production system is required to follow the fluctuation of the generated power of the renewable energy power generation device and to adjust the supply-demand balance of the power system, so that higher control performance is required.

In a hydrogen production system having such a renewable energy power generation device, it is necessary to secure hydrogen demand as a premise. On the other hand, when the amount of power generated by the renewable energy power generation device is large, economical operation such as producing extra hydrogen is required. However, matching the amount of hydrogen produced with the target value and producing extra hydrogen with the generated power of the renewable energy power generation device are contradictory purposes.

Japanese Patent No. 6356643

The problem to be solved by the present invention is to provide a control device for a hydrogen production system capable of adjusting the use of generated power in a renewable energy power generation device, and a control method for the hydrogen production system so as to achieve conflicting objectives. That is.

The control device of the hydrogen production system according to the present embodiment is a control device of the hydrogen production system that produces hydrogen by the first electric power generated by the renewable energy power generation device and the second electric power supplied from the electric power system. The first target input power, which is the target input power of the first power to the hydrogen production apparatus in the hydrogen production system, the target hydrogen production amount, which is the target hydrogen production amount of the hydrogen production system, and A determination unit that determines each weight parameter for at least one of the second target input power, which is the target input power of the second power to the hydrogen production apparatus, the input power of the first power, and the hydrogen production. The amount and at least one of the input powers of the second power are set so as to approach any of the corresponding ones of the first target input power, the target hydrogen production amount, and the second target input power. A calculation unit that preferentially calculates as the corresponding weight parameter increases, and calculates at least a first power input instruction value indicating the input power of the first power to the hydrogen production system, and the first power input instruction. It includes an output unit that outputs a command signal including value information to the hydrogen production system, and the determination unit changes the weight parameter according to a change in the physical amount of the hydrogen production amount of the hydrogen production apparatus.

According to the present embodiment, it is possible to adjust the utilization of the generated power in the renewable energy power generation device so as to achieve the conflicting purposes.

A block diagram showing the configuration of a hydrogen system. A block diagram showing a configuration of a control device. The figure when the target hydrogen production amount is prioritized over the PCS output power. The figure which shows the example which changes the weight parameter q2 according to the hydrogen production amount error. The figure which shows the example which changed the relative ratio of weight parameters q1 and q2 according to the hydrogen production amount error. The flowchart which shows the processing example of a control device. The block diagram which shows the structure of the control apparatus which concerns on 2nd Embodiment. The block diagram which shows the structure of the control apparatus which concerns on 3rd Embodiment. The figure which shows the integrated value of PV power generation power and ± 1σ confidence interval of the 30-minute PV power generation amount confidence interval.

Hereinafter, the control device for the hydrogen production system and the control method for the hydrogen production system according to the embodiment of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of the embodiments of the present invention, and the present invention is not construed as being limited to these embodiments. Further, in the drawings referred to in the present embodiment, the same parts or parts having similar functions may be designated by the same reference numerals or similar reference numerals, and the repeated description thereof may be omitted. In addition, the dimensional ratio of the drawing may differ from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing.
(First Embodiment)

FIG. 1 is a block diagram showing a configuration of a hydrogen system 1 according to the first embodiment. As shown in FIG. 1, the hydrogen system 1 according to the present embodiment is a system for generating hydrogen, and includes a hydrogen production system 10, an energy management system 20, and a control device 30. In FIG. 1, the power system Eps is further illustrated. This power system Eps is generally managed by a power company.

The hydrogen production system 10 produces hydrogen by the PV power generation power generated by the renewable energy power generation device 10a in the hydrogen production system 10 and the received power supplied from the power system Eps. That is, the hydrogen production system 10 includes a renewable energy power generation device 10a, a power conditioner (PCS) 10b, a hydrogen production device 10c, and a hydrogen storage device 10d. The PV generated power according to the present embodiment corresponds to the first power, and the received power corresponds to the second power. The details of the hydrogen production system 10 will be described later.

The energy management system 20 creates an operation plan for the hydrogen production system 10. The operation plan is, for example, a plan of 48 frames in which one day is divided into 30-minute units. The unit when one day is divided into 30-minute units is called a "frame".

The control device 30 controls the hydrogen production system 10 based on the operation plan created by the energy management system 20. The control device 30 controls, for example, the hydrogen production device 10c and the power conditioner 10b, and outputs an instruction value for each of them. The details of the control device 30 will be described later.

The hydrogen load HR is a device that consumes hydrogen. The hydrogen load HR is, for example, a fuel cell power generation device, a fuel cell vehicle, or the like.

Here, the details of the hydrogen production system 10 will be described. As shown in FIG. 1, the renewable energy power generation device 10a has a power generation facility derived from natural energy. The power generation facility derived from this renewable energy is, for example, a photovoltaic power generation device (PV) using sunlight. The renewable energy power generation device 10a does not require fuel such as fossil fuel, but the amount of power generated is unstable because it is affected by the environment such as the weather. The renewable energy power generation device 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 the PV power generated by the renewable energy power generation device 10a into a predetermined output power. More specifically, the power conditioner 10b supplies the hydrogen production device 10c with the PCS output power whose magnitude is adjusted according to the command signal including the information of the output power input from the control device 30. That is, the magnitude of the PCS output power output by the power conditioner 10b is adjusted to be equal to or less than the PV power generation power. Further, when the introduction of renewable energy progresses and there is a risk that the balance between supply and demand in the power system Eps may be disrupted, it is conceivable that the renewable energy cannot be sold, that is, reverse power flow to the power system Eps cannot be performed. Therefore, in the following, the power conditioner 10b will be controlled to perform operation without reverse power flow of renewable energy.

The hydrogen production apparatus 10c produces hydrogen from electricity and water by water electrolysis. The hydrogen production device 10c is, for example, an electrolysis device that produces hydrogen and oxygen by passing an electric current through an alkaline solution. Further, the hydrogen production device 10c stores the generated hydrogen 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. The hydrogen storage device 10d is connected to the hydrogen production device 10c and the hydrogen load HR via a pipe. Further, the hydrogen storage device 10d supplies hydrogen to the hydrogen load HR via a pipe.

FIG. 2 is a block diagram showing the configuration of the control device 30. As shown in FIG. 2, the control device 30 includes an interface unit 30a, a model storage unit 30b, a parameter determination unit 30c, a command value calculation unit 30d, and a command value output unit 30e. Each processing unit of the interface unit 30a, the parameter determination unit 30c, the command value calculation unit 30d, and the command value output unit 30e is, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable). ) Is composed of hardware including circuits such as).

The interface unit 30a acquires, as a planned value, a hydrogen production amount target value, which is a target hydrogen production amount of the hydrogen production apparatus 10c, as a target hydrogen production amount from the energy management system 20. As described above, since the operation plan consists of 48 frames in which one day is divided in 30-minute units, the target hydrogen production amount also changes in 30-minute units. Further, the interface unit 30a acquires the received power, the PV generated power, the PCS output power, and the hydrogen production amount as the current values from the hydrogen production system 10.

The model storage unit 30b is realized by, for example, a RAM (Random Access Memory), a semiconductor memory element such as a flash memory, a hard disk, or the like. The model storage unit 30b stores the models of the hydrogen production apparatus 10c and the power conditioner 10b to be controlled. This model represents the dynamic characteristics of each device, such as the first-order lag system and dead time. Further, the model storage unit 30b stores the evaluation function used in the command value calculation unit 30d described later. Further, the model storage unit 30b stores the power generation prediction model of the renewable energy power generation device 10a. The power generation prediction model is, for example, an AR model (autoregressive model), and predicts the PV power generation power of the renewable energy power generation device 10a.

The parameter determination unit 30c determines the control parameters of the hydrogen production system 10. Here, the control parameter is, for example, a weight parameter in the evaluation function stored in the model storage unit. That is, the parameter determination unit 30c has the first target input power, which is the target input power of the PV power generated by the renewable energy power generation device 10a to the hydrogen production device 10, and the target hydrogen production of the hydrogen production system 10. Weight parameters are determined for the target hydrogen production amount, which is the amount, and at least one of the second target input power, which is the target input power of the received power supplied from the power system Eps to the hydrogen production apparatus 10. Further, the parameter determination unit 30c changes the weight parameter according to the physical quantity related to the hydrogen production amount of the hydrogen production apparatus 10. For example, the parameter determination unit 30c depends on at least one of the actual hydrogen production amount of the hydrogen production apparatus 10, the elapsed time within the control period, and the integrated value of the input power to the hydrogen production system 10 in the PV power generation power. And change the weight parameter. The parameter determination unit 30c according to the present embodiment corresponds to the determination unit. The details of the parameter determination unit 30c will be described later.

The command value calculation unit 30d uses the control parameters determined by the parameter determination unit 30c and the model stored in the model storage unit 30b to use the PCS which is an input value of the input power from the power conditioner 10b to the hydrogen production apparatus 10. The output power instruction value (first power input instruction value) and the hydrogen production device input power instruction value, which is the instruction value of the total input power to the hydrogen production device 10c, are calculated. For example, the command value calculation unit 30d sets the input power of the PCS output power (first power), the hydrogen production amount, and at least one of the input power of the second power as the weight parameter corresponding to each becomes larger. It is calculated preferentially, and at least the PCS output power instruction value indicating the input power from the power conditioner 10b of the PV generated power to the hydrogen production system 10 is calculated. Further, the hydrogen production apparatus input power includes PCS output power and received power. That is, the total input power to the hydrogen production device 10c is the sum of the PCS output power, which is the input power from the power conditioner 10b to the hydrogen production device 10, and the received power supplied from the power system Eps. In other words, the value obtained by subtracting the PCS output power, which is the input power from the power conditioner 10b to the hydrogen production device 10, from the total input power to the hydrogen production device 10c is the received power supplied from the power system Eps.

Further, in the hydrogen production system 10, it is necessary to operate the input power and the PCS output power of the hydrogen production apparatus to control the hydrogen production amount so as to satisfy the target value and to control the received power so as not to reverse power flow. Furthermore, in the hydrogen production system 10, since economical operation is required, it is required to use PV generated power (make the PCS output power close to PV generated power). That is, the hydrogen production system 10 is a multi-input multi-output control system. Therefore, when the command value calculation unit 30d determines the command value, the command value is calculated by, for example, model prediction control or an optimum regulator. The command value calculation unit 30d according to the present embodiment corresponds to the calculation unit.

The command value output unit 30e outputs the hydrogen production device input power instruction value that correlates with the hydrogen production amount of the hydrogen production device 10c calculated by the command value calculation unit 30d to the hydrogen production device 10c, and outputs the PCS output power instruction value to the power conditioner. Output to 10b. The command value output unit 30e according to this embodiment corresponds to the output unit.

ｋは現在時刻であり、例えば秒を示す。Ｎは予測区間であり、例えば３０秒である。 Here, the details in the parameter determination unit 30c will be described. In the present embodiment, the command value calculation unit 30d calculates the command value by, for example, model prediction control. Therefore, for the evaluation function J (k) in the model storage unit, for example, the equation (1) is used.

k is the current time, for example, seconds. N is a prediction interval, for example 30 seconds.

H (k) is the actual hydrogen production amount of the hydrogen production device 10c, and SV_H (k) is the target hydrogen production amount of the hydrogen production device 10c. Further, PV (k) is PV power generation power which is a predicted value of power generation power in the renewable energy power generation device 10a, and PCS (k) is PCS output power which is output power in the power conditioner 10b. Furthermore, EC (k) is the input power of the hydrogen production device, and AUX (k) is all the input power to the hydrogen production system 10 excluding the input power of the hydrogen production device (hereinafter, referred to as "other power"). ). SV_E (k) is a received power target value of the second power with a margin to prevent reverse power flow. Further, each of q1, q2, and q3 is a weighting coefficient, and corresponds to each weighting parameter determined by the parameter determination unit. The PCS output power PCS (k) according to the present embodiment corresponds to the first target input power, and the received power target value SV_E (k) of the second power corresponds to the second target input power.

Here, the hydrogen production amount H (k) and the hydrogen production apparatus input power EC (k) have a relationship of, for example, H (k) = f (EC (k)). That is, the hydrogen production apparatus input power EC (k) correlates with the hydrogen production amount H (k) of the hydrogen production apparatus 10c. The relationship of H (k) = f (EC (k)) is stored in the model storage unit 30b as a model.

The first term of the equation (1), that is, the term of q1, is a term that acts so as to make the hydrogen production amount H (k) coincide with the target hydrogen production amount SV_H (k). The second term, that is, the term of q2, is a term for matching the PCS output power PCS (k) with the PV power generation power PV (k). That is, it is a term that acts to effectively use the PV generated power of the renewable energy power generation device 10a.

The third term, that is, the term of q3, is a term for preventing reverse power flow. For example, when the PV generated power PV (k) increases, the evaluation function J (k) acts to match the PV generated power PV (k) and the PCS output power PCS (k) according to the second term. .. As a result, the evaluation function J (k) determines the hydrogen production apparatus input power EC (k) and the hydrogen production amount H (k) with respect to the change in the PCS output power PCS (k) of the third term. Acts to increase.

On the other hand, the evaluation function J (k) reduces the hydrogen production amount H (k) according to the first term when the hydrogen production amount H (k) becomes larger than the target hydrogen production amount SV_H (k). Acts on. That is, the effects of the first term and the second term are opposite to each other. Therefore, depending on the setting of the weight parameter, there is a possibility that the purpose of either the first term or the second term cannot be achieved. In this way, depending on the values of the weight parameters q1, q2, and q3, one of the target hydrogen production amount SV_H (k), the PCS output power PCS (k), and the second power received power target value SV_E (k) has priority. Will be processed.

FIG. 3 is a diagram when the target hydrogen production amount SV_H (k) is prioritized over the PCS output power PCS (k). The vertical axis shows electric power and hydrogen production, and the horizontal axis shows elapsed time. Here, the weight parameters q1 = 1.0, q2 = 0.1, and q3 = 1.0. That is, the weight parameter q1 is given priority over q2. As a result, matching the hydrogen production amount H (k) with the target hydrogen production amount SV_H (k) is more likely than matching the predicted values PV power generation power PV (k) and PCS output power PCS (k). have priority. In this case, as shown in the frame 300, the actual PV generated power increases according to the predicted value of the PV generated power PV (k), and a surplus amount is generated. However, since it is important to match the hydrogen production amount H (k) with the target hydrogen production amount SV_H (k), the PCS output power PCS (k) does not increase, and as a result, the hydrogen production device input power EC (k) Does not increase.

Here, producing hydrogen using the surplus amount of PV generated power PV (k) is to produce more than the target hydrogen production amount SV_H (k) because electricity is not purchased from the power system EPs. Is considered to be okay. Even if the hydrogen production amount H (k) has a large error from the target hydrogen production amount SV_H (k), when the actual PV power generation PV (k) is large, the surplus amount is used to actively produce hydrogen. By doing so, it is not necessary to purchase electricity from the power system EPs when the PV generated power PV (k) is low. However, if q2 is always increased with an emphasis on the effective use of PV power generation PV (k), the target hydrogen production amount SV_H (k) of hydrogen production amount H (k) is reached when the PV power generation power PV (k) is small. The tracking performance of is deteriorated. Therefore, in the present embodiment, as shown in FIG. 4, the relative ratio between the weight parameters q1 and q2 is changed according to the hydrogen production amount H (k).

FIG. 4 is a diagram showing an example in which the weight parameter q2 is changed according to the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j). The vertical axis represents the weight parameter q2, and the horizontal axis represents the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j). As shown in FIG. 4, the parameter determination unit 30c changes the relative ratio of the weight parameter q2 and the weight parameter q1 according to the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j). To do. That is, the parameter determination unit 30c increases the value of the weight parameter q2 when the hydrogen production amount error becomes positive. As a result, when the hydrogen production amount error becomes positive, the action of matching the PV generated power PV (k) and the PCS output power PCS (k) by the second term of the evaluation function J (k) works more strongly. In the evaluation function j (k), the weight parameter q1 may be relatively decreased instead of increasing the weight parameter q2. That is, when q2 / q1, which is the ratio of the weight parameter q2 and the weight parameter q1, is increased, the action of matching the PV power generation power PV (k) and the PCS output power PCS (k) works more strongly.

FIG. 5 is a diagram showing an example in which the relative ratio between the weight parameters q1 and q2 is changed according to the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j). Hydrogen production error (H (k + j) -SV_H (k + j)) / SV_H (k + j) is in the negative range, and the weight parameters q1 = 1.0, q2 = 0.1, q3 = 1.0, which are positive. In the range, the weight parameters q1 = 1.0, q2 = 10.0, q3 = 1.0.

As shown in FIGS. 4 and 5, the parameter determination unit 30c changes the relative ratio of the weight parameters q1 and q2 according to the hydrogen production amount H (k). For example, the parameter determination unit 30c changes the ratio of the weight parameters q2 and q1. More specifically, the parameter determination unit 30c is the output power in the power conditioner 10b when the actual hydrogen production amount H (k) of the hydrogen production system 10 is smaller than the target hydrogen production amount SV_H (k). The weight parameters q1 and q2 are determined so that the hydrogen production amount H (k) is prioritized over the PCS output power (input power of the first power), and the hydrogen production system 10 is more than the target hydrogen production amount SV_H (k). When the actual hydrogen production amount of H (k) is large, the weight parameter is determined so that the PCS output power (input power of the first power) is prioritized over the hydrogen production amount H (k). For example, the parameter determination unit 30c has a weight parameter q2 when the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j) is negative, that is, the hydrogen production amount H (k) is insufficient. The ratio of is relatively small. As a result, it is more important that the hydrogen production amount H (k) matches the target hydrogen production amount SV_H (k). On the other hand, the parameter determination unit 30c relatively increases the ratio of the weight parameter q2 when the hydrogen production amount error is positive, that is, when the hydrogen production amount H (k) is surplus. As a result, the effective use of PV power generation is emphasized, and the input power EC (k) of the hydrogen production apparatus is further increased. In this way, by changing the weight parameter that affects the control performance according to the hydrogen production amount H (k), it is possible to achieve two contradictory purposes.

第２項は、ＰＶ発電電力ＰＶｒ（ｋ）の余剰量がある場合に、ＰＣＳ出力電力ＰＣＳ（ｋ）を少なくとも現在のＰＶ発電電力ＰＶｒ（ｋ）まで一致させるように作用する。（１）式と比べると、再生可能エネルギー発電装置１０ａのＰＶ有効利用の効果が低下する可能性はあるが、短期の変動を予測するのが難しい再生可能エネルギー発電装置１０ａのＰＶ発電電力予測が不要となる。 In the equation (1), the PV generated power PV (k) is used in the second term, but instead of the PV generated power PV (k), as shown in the equation (2), the current actual PV generated power PVr. (K) may be used.

The second term acts to match the PCS output power PCS (k) to at least the current PV power generation power PVr (k) when there is a surplus amount of the PV power generation power PVr (k). Compared with equation (1), the effect of effective use of PV of the renewable energy power generation device 10a may be reduced, but it is difficult to predict short-term fluctuations. It becomes unnecessary.

FIG. 6 is a flowchart showing a processing example of the control device 30. As shown in FIG. 6, first, the model storage unit 30b stores the evaluation function used for the calculation in the command value calculation unit 30d and the model (step S100). These evaluation functions and the model are input from a central processing unit (not shown) via, for example, the interface unit 30a.

Next, the interface unit 30a acquires the target hydrogen production amount as the hydrogen production target value for 48 frames, that is, for one day from the energy management system 20 (step S102). Subsequently, from the hydrogen production system 10, the interface unit 30a receives power SV_E (k), PV power generation PV (k), and the current values.
The PCS output power PCS (k), the hydrogen production amount H (k), and the like are acquired (step S104).

Next, the parameter determination unit 30c determines the relative ratio of the weight parameter q2 and the weight parameter q1 according to the hydrogen production amount error (H (k + j) -SV_H (k + j)) / SV_H (k + j) (step S106). ).

Next, the command value calculation unit 30d indicates the PCS output power by the evaluation function J (k) using the weight parameter q2 determined by the parameter determination unit 30c, the weight parameter q1, and the model stored in the model storage unit 30b. The value PCS (k) and the hydrogen production device input power instruction value EC (k), which is the input power to the hydrogen production device 10c, are calculated (step S108).

Next, the command value output unit 30e outputs the PCS output power instruction value PCS (k) to the power conditioner 10b and the hydrogen production device input power instruction value EC (k) to the hydrogen production device 10c (step S110). The command value output unit 30e determines whether or not one frame is completed (step S112), and if it is not completed (NO in step S112), repeats the process from step S104. On the other hand, if it is completed (YES in step S114), the command value output unit 30e determines whether or not 24 frames have been completed (step S114), and if it has not been completed (NO in step S114), from step S102. Repeat the process of. On the other hand, if it is finished (YES in step S116), the whole process is finished.

As described above, according to the present embodiment, the parameter determination unit 30c outputs the PCS when the actual hydrogen production amount H (k) of the hydrogen production apparatus 10 is smaller than the target hydrogen production amount SV_H (k). The weight parameters q1, q2, and q3 are determined so that the hydrogen production amount H (k) is prioritized over the output power of the power PCS (k), and the actual hydrogen production device 10 is over the target hydrogen production amount SV_H (k). When the hydrogen production amount H (k) is large, the weight parameters q1, q2, and q3 are determined so that the output power of the PCS output power PCS (k) is prioritized over the hydrogen production amount H (k). As a result, when the hydrogen production amount H (k) is small, the hydrogen production amount H (k) is prioritized, so that the hydrogen production amount H (k) can be brought closer to the target hydrogen production amount SV_H (k). When the amount of hydrogen produced H (k) is large, the output power of the PCS output power PCS (k) is prioritized, so that the surplus power of the renewable energy power generation device 10a can be used. In this way, by changing the weight parameter according to the hydrogen production amount H (k), the utilization adjustment of the PV power generation power PV (k) in the renewable energy power generation device is adjusted so as to achieve the two contradictory purposes. It can be carried out.

(Second Embodiment)
The control device 30 according to the second embodiment receives a demand response (DR) for adjusting the amount of power received in units of 30 minutes as a request for a balance between supply and demand from the energy management system 20, and thus hydrogen production according to the first embodiment. It is different from the control device 30 of the system 10. Hereinafter, the differences from the first embodiment will be described. In the present embodiment, a processing example of the control device 30 in each time zone is set as a supply-demand balance time zone (hereinafter sometimes referred to as a DR time zone) and a non-DR time zone as a normal time zone. explain.

FIG. 7 is a block diagram showing a configuration of the control device 30 according to the second embodiment. As shown in FIG. 7, the interface unit 30a further acquires the DR time zone and the received power amount target value from the energy management system 20. The model storage unit further stores the evaluation function _JDR (k) in the DR time zone.

The parameter determination unit 30c uses the evaluation function J (k) represented by the equation (1) in the normal time zone as in the first embodiment. On the other hand, the evaluation function _JDR (k) in the DR time zone is expressed by, for example, equations (3) to (5). In the DR balance time zone, the input electric energy SV_E _DR (k) of the second electric power to the hydrogen production apparatus 10 is set as shown in the equation (5). That is, SV_E _DR (k) is the received power in the DR time zone.

In the equation (3), G (k) is an integrated value of the received power as shown in the equation (4). Further, SV_G (k) is a target value of the integrated value in the received power as shown by the equation (5).

The parameter determination unit 30c determines the weight parameters q1 _DR and q2 _DR . The first term of the equation (3), that is, the term of q1 _{DR is} a term that acts so as to make the integrated amount G (k) of the received power coincide with the integrated amount target value SV_G (k) of the received power. Further, the second term, that is, the term of q2 _{DR is} a term that acts so as to match the PCS output power PCS (k) with the PV generated power estimated value PV (k). That is, it is a term for effectively using the PV power generation power PV (k) of the renewable energy power generation device 10a.

Here, in the second term of the equation (3), the predicted value PV (k) of the PV generated power is used. For example, when the predicted value PV (k) of PV generated power increases, if the actual PV generated power does not increase, the power for the prediction error of PV generated power will be received from the power system, and the received power will be received. The integrated value G (k) of is increased.

Further, for example, when the reaction delay of the hydrogen production apparatus 10c is large, consider the case where the PCS output power PCS (k) matches the actual PV power generation power with an emphasis on effective PV utilization. At this time, if the PV generated power decreases sharply, the change in the hydrogen production apparatus 10c cannot keep up with this change. Therefore, the hydrogen production apparatus 10c requires additional power, but since there is no power to be added to the PCS output power, the power is received from the power system, and the integrated value G (k) of the received power increases. ..

As described above, in the DR time zone, the agreement with the target value of the received power amount SV_G (k) and the effective use of the PV generated power PV (k) cause contradictory actions. Therefore, there is a possibility that the purpose of either the first term or the second term cannot be achieved by setting the weight parameter.

In the present embodiment, the conflicting effects are alleviated by changing the weight parameter according to the elapsed time of the DR time zone. For example, since the received power amount of 30 minutes at DR time zone G the (k) it is sufficient to match the target value, the before after 25 minutes may be set large q2 _DR, after lapse of 25 minutes q2 _DR By reducing the value, it becomes possible to emphasize matching the received power amount G (k) with the target value in the remaining 5 minutes. Alternatively, the q1 _DR after 25 minutes may be increased.

In the present embodiment, the evaluation function of Eq. (1) is used for the normal time zone and Eq. (2) is used for the DR time zone, but the present invention is not limited to this. For example, the weight parameter may be changed by using the same evaluation function in the normal time zone and the DR time zone. The evaluation function in this case is shown in Eq. (6). Each command value is calculated with q1 _DR as 0 in the normal time zone and q1 and q3 as 0 in the DR time zone.

As described above, according to the embodiment of the present embodiment, the weight parameter q2 _DR regarding the PV generated power PV (k) is changed according to the elapsed time in the DR time zone. As a result, the two contradictory purposes of matching the integrated value G (k) of the received power with the target power received amount SV_G (k) in the DR time zone and effectively using the PV generated power PV (k) are achieved. It will be possible to achieve. In this way, PV power generation in the renewable energy power generation device so as to achieve two contradictory purposes by changing the weight parameter q2 _DR regarding the PV power generation power PV (k) in the DR time zone according to the elapsed time. The use of electric power PV (k) can be adjusted.

(Third Embodiment)
The control device 30 according to the third embodiment is different from the control device 30 of the hydrogen production system 10 according to the second embodiment in that the control process is further performed by using the information of the 30-minute PV power generation confidence interval. Hereinafter, the differences from the second embodiment will be described.

FIG. 8 is a block diagram showing a configuration of the control device 30 according to the third embodiment. As shown in FIG. 8, the interface unit 30a further acquires the predicted value of the 30-minute PV power generation amount and the 30-minute PV power generation amount confidence interval from the energy management system 20. Here, the 30-minute PV power generation confidence interval is, for example, from the average value of the integrated values of the PV power generation PV (k) when the probability distribution of the integrated value of the PV power generation power PV (k) is a normal distribution. Corresponds to the range of ± 1σ.

FIG. 9 is a diagram showing an integrated value of PV power generation power PV (k) and a ± 1σ confidence interval of the 30-minute PV power generation amount confidence interval. The vertical axis shows the integrated electric energy of the PV generated power PV (k), and the horizontal axis shows the elapsed time. The predicted power generation value corresponds to the predicted 30-minute PV power generation amount.

As shown in FIG. 9, the parameter determination unit 30c integrates the PV generated power PV (k), and when the integrated power amount reaches the threshold value TH1 corresponding to the value of −σ in the confidence interval at time t1, it starts from time t1. The weight parameter q2 _DR (Equation (3)) in the second period after is made smaller than that in the first period before the time t1. Alternatively, the parameter determination unit 30c may gradually reduce the weight parameter q2 _DR as the integrated electric energy approaches the threshold value TH1. Further, the parameter determination unit 30c may set the weight parameter q2 _DR to 0 when the integrated electric energy reaches the threshold value TH1 at time t1. In this case, the integrated value G (k) of the received power can be matched with the target value. Then, when the time t2 is reached, the DR time zone ends.

As described above, according to the present embodiment, the weight parameter q2 _DR regarding the PCS output power (input power of the first power), which is the target input power of the first power to the hydrogen production apparatus 10, is set to the PV power generation power. When the integrated power amount of PV (k) reaches the threshold value TH1 corresponding to the value of −σ in the confidence interval, it is decided to decrease or set it to 0. As a result, the PV generated power PV (k) can be used at a value close to the target value, and the integrated value G (k) of the received power is almost equal to the target power received amount SV_G (k) in the DR time zone. It is also possible to match. Therefore, the two contradictory purposes of matching the integrated value G (k) of the received power with the target power received amount SV_G (k) in the DR time zone and effectively using the PV generated power PV (k) are achieved. It becomes possible to do. In this way, when the integrated power amount of the PV generated power PV (k) reaches the threshold value TH1 corresponding to the value of −σ in the confidence interval, the weight parameter q2 _DR is reduced or set to 0, thereby causing two conflicting powers. The utilization of PV generated power PV (k) in the renewable energy power generation device can be adjusted so as to achieve the purpose.

At least a part of the control device of the hydrogen production system described in the above-described embodiment may be configured by hardware or software. When configured by software, a program that realizes at least a part of the functions of the control device and the hydrogen production system may be stored in a recording medium such as a flexible disk or a CD-ROM, read by a computer, and executed. The recording medium is not limited to a removable one such as a magnetic disk or an optical disk, and may be a fixed recording medium such as a hard disk device or a memory.

Further, a program that realizes at least a part of the functions of the control device of the hydrogen production system may be distributed via a communication line (including wireless communication) such as the Internet. Further, the program may be encrypted, modulated, compressed, and distributed via a wired line or wireless line such as the Internet, or stored in a recording medium.

Although some embodiments have been described above, these embodiments are presented only as examples and are not intended to limit the scope of the invention. The novel devices, methods and programs described herein can be implemented in a variety of other forms. In addition, various omissions, substitutions, and changes can be made to the forms of the apparatus, method, and program described in the present specification without departing from the gist of the invention.

1: Hydrogen system, 10: Hydrogen production system, 30: Control device, 10a: Renewable energy power generation device, 10c: Hydrogen production device, 30c: Parameter determination unit, 30d: Command value calculation unit, 30e: Command value output unit.

Claims (14)

It is a control device for a hydrogen production system that produces hydrogen from the first power generated by a renewable energy power generation device and the second power supplied from the power system.
The first target input power, which is the target input power of the first power to the hydrogen production apparatus in the hydrogen production system, the target hydrogen production amount, which is the target hydrogen production amount of the hydrogen production apparatus, and the first. A determination unit that determines each weight parameter for at least one of the second target input powers, which is the target input power of the two powers to the hydrogen production apparatus.
The input power of the first electric power, the hydrogen production amount, and at least one of the input powers of the second electric power are included in the first target input power, the target hydrogen production amount, and the second target input power. The first power input instruction value indicating at least the input power of the first power to the hydrogen production system is calculated preferentially as the weight parameter corresponding to each becomes larger so as to approach any of the corresponding ones. The calculation unit to calculate and
An output unit that outputs a command signal including information on the first power input instruction value to the hydrogen production system, and an output unit.
With
The determination unit is a control device for a hydrogen production system that changes the weight parameter according to a change in a physical quantity related to the hydrogen production amount of the hydrogen production device. The determination unit changes the weight parameter according to at least one of the actual hydrogen production amount of the hydrogen production system, the elapsed time within the control period, and the integrated value of the input power in the first power. The control device for the hydrogen production system according to claim 1. The hydrogen production system according to claim 1 or 2, wherein the determination unit changes the weight parameter according to the magnitude of an error between the target hydrogen production amount and the actual hydrogen production amount of the hydrogen production system. Control device. The determination unit determines the weight parameter so that the hydrogen production amount is prioritized over the input power of the first electric power when the actual hydrogen production amount of the hydrogen production system is smaller than the target hydrogen production amount. And
3. The weight parameter is determined so that the input power of the first electric power is prioritized over the hydrogen production amount when the actual hydrogen production amount of the hydrogen production system is larger than the target hydrogen production amount. The control device for the hydrogen production system described in 1. The hydrogen production system according to claim 1 or 2, wherein the determination unit changes the weight parameter according to a supply-demand balance time zone in which the amount of input power of the second power to the hydrogen production system is set. Control device. The determination unit prioritizes the hydrogen production amount over the input power of the second power in the time zone on the front side in the supply and demand balance time zone, and the time zone on the rear side of the front side in the supply and demand balance time zone. The control device for a hydrogen production system according to claim 5, wherein the weight parameter that prioritizes the input power of the second power over the hydrogen production amount is determined. In the case of the supply-demand balance time zone, the determination unit determines that the closer the integrated value of the input power of the first power from the start time to the elapsed time within the supply-demand balance time zone approaches a predetermined threshold value, the more the first The control device for a hydrogen production system according to claim 5, wherein the hydrogen production amount is changed to the weight parameter that gives priority to the hydrogen production amount over the input power of the electric power. The control of the hydrogen production system according to claim 7, wherein the determination unit reduces the weight parameter related to the first electric power among the weight parameters as it approaches the predetermined threshold value in the supply-demand balance time zone. apparatus. The first difference value, which is the difference between the actual hydrogen production amount of the hydrogen production apparatus and the target hydrogen production amount, the second difference value, which is the difference between the first power and the first target input power, and the above. Further, a storage unit for storing an evaluation function based on a value obtained by subtracting the input power of the first power from the input power to the hydrogen production apparatus and a third difference value which is a difference between the second target input power is further provided.
The determination unit is within the first weighting coefficient of the value based on the first difference value in the evaluation function, the second weighting coefficient of the value based on the second difference value, and the third weighting coefficient of the value based on the third difference value. The first weighting factor, the second weighting factor, and the third weighting factor are determined as the weighting parameters.
Based on the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient determined by the determining unit, the calculation unit receives a hydrogen production apparatus input power instruction value that correlates with the hydrogen production amount of the hydrogen producing apparatus. The hydrogen production system according to claim 1, wherein the first power input instruction value is calculated with an output power command value to a power conditioner in the hydrogen production system that adjusts the output power of the renewable energy power generation device. Control device. The control device for a hydrogen production system according to claim 9, wherein the third difference value of the evaluation function has an effect of preventing reverse power flow to the power system. The control device for a hydrogen production system according to claim 9 or 10, wherein the calculation unit performs calculation processing by model prediction control or optimum regulator control using the evaluation function. In the supply-demand balance time zone in which the amount of input power of the second power to the hydrogen production apparatus is set,
The evaluation function is also based on the fourth difference value between the integrated amount of power obtained by subtracting the first power from the received power of the hydrogen production apparatus and the integrated amount of the set input power of the second power. Ori,
The ninth aspect of the present invention, wherein the determination unit determines a fourth weighting coefficient of a value based on the first weighting coefficient, the second weighting coefficient, the third weighting coefficient, and the fourth difference value as the weighting parameter. Control device for hydrogen production system. In the supply and demand balance time zone
The control device for a hydrogen production system according to claim 12, wherein the determination unit sets the first weighting factor and the third weighting factor to 0. It is a control method of a hydrogen production system that produces hydrogen by the first electric power generated by a renewable energy power generation device and the second electric power supplied from the electric power system.
The first target input power, which is the target input power of the first power to the hydrogen production apparatus in the hydrogen production system, the target hydrogen production amount, which is the target hydrogen production amount of the hydrogen production system, and the first. A determination step of determining weight parameters for at least one of the second target input powers, which is the target input power of the two powers to the hydrogen production apparatus, and
The input power of the first electric power, the hydrogen production amount, and at least one of the input powers of the second electric power are brought close to the first target input power, the target hydrogen production amount, and the second target input power. In addition, a calculation step of preferentially calculating as the weight parameter corresponding to each increases, and calculating at least a first power input instruction value indicating the input power of the first power to the hydrogen production system.
An output process that outputs a command signal including information on the first power input instruction value to the hydrogen production system, and
With
The determination step is a control method of a hydrogen production system in which the weight parameter is changed according to a change in a physical quantity with respect to the hydrogen production amount of the hydrogen production apparatus.

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