Power control method, power control device, and power supply system

Abstract

A power control method according to the present disclosure comprises: a step for controlling the power generated by a fuel cell device to a planned value for the power generated by the fuel cell device when power is supplied to a power load of a power consumer by a distributed power supply system provided with the fuel cell device and a power storage device; and executing a first correction for reducing the planned value when the charging rate of the power storage device after a predetermined period of time estimated on the basis of the planned value is greater than an upper limit value that is less than 100% when the control is executed, and executing a second correction for reducing the planned value when the charging rate of the power storage device is greater than an upper limit value that is less than 100%. Or when the charging rate of the power storage device after a predetermined period of time estimated on the basis of the planned value is less than a lower limit value greater than 0%, a second correction for increasing the planned value is performed.

Description

Technical Field

[0001] This disclosure relates to power control methods, power control devices, and power supply systems. Background Technology

[0002] Various solutions have been proposed for power control of power supply systems. As an example, Patent Document 1 describes a method of determining the fuel cell output based on the battery's charge level. Specifically, it discloses a control mechanism where the fuel cell output decreases when the battery charge level is high and increases when the battery charge level is low.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2015 / 162940 Summary of the Invention

[0006] The technical problem to be solved by the invention

[0007] As an example, the subject of this disclosure is to provide a power control method, power control device, and power supply system that can reduce the possibility of an energy storage device being in a fully charged or fully discharged state compared to the past.

[0008] Technical solutions for solving the problem

[0009] To address the aforementioned issues, one aspect of the present disclosure provides a power control method comprising: when supplying power to the power load of a power consumer through a distributed power system equipped with a fuel cell device and an energy storage device, controlling the power generated by the fuel cell device to a planned value; and, when performing the control, performing a first correction that reduces the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value is greater than an upper limit value less than 100%, or performing a second correction that increases the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value is less than a lower limit value greater than 0%.

[0010] One technical solution disclosed herein is a power control device for a distributed power system having a fuel cell device and an energy storage device, comprising: a memory storing a planned value of the power generated by the fuel cell device; and a controller that, when supplying power to the power load of a power consumer through the distributed power system, controls the power generated by the fuel cell device to the planned value of the power generated by the fuel cell device, wherein, when executing the control, the controller performs a first correction to reduce the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value is greater than an upper limit value less than 100%, or performs a second correction to increase the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value is less than a lower limit value greater than 0%.

[0011] One power system disclosed herein includes a fuel cell device, an energy storage device, and the aforementioned power control device.

[0012] Invention Effects

[0013] The power control method, power control device, and power supply system disclosed herein can reduce the possibility of the energy storage device being in a fully charged or fully discharged state compared to the past. Attached Figure Description

[0014] Figure 1 This is a diagram illustrating an example of a power supply system according to the first embodiment.

[0015] Figure 2 This is a diagram illustrating an example of a distributed power system provided by the power system of the first embodiment.

[0016] Figure 3 This is a diagram illustrating an example of the power control device according to the first embodiment.

[0017] Figure 4A This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the first embodiment.

[0018] Figure 4B This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the first embodiment.

[0019] Figure 5 This is a diagram illustrating an example of the operation (power control method) of the power control device of the first embodiment.

[0020] Figure 6 This is a diagram illustrating an example of the operation of the power control device (power control method) in the first embodiment of the first implementation.

[0021] Figure 7 This is a diagram illustrating an example of the operation of the power control device (power control method) in the second embodiment of the first embodiment.

[0022] Figure 8 This is a diagram illustrating an example of the operation of the power control device (power control method) in the third embodiment of the first embodiment.

[0023] Figure 9 This is a diagram illustrating an example of a distributed power system provided by the power system of the fourth embodiment of the first embodiment.

[0024] Figure 10 This is a diagram illustrating an example of a power supply system according to the second embodiment.

[0025] Figure 11A This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the second embodiment.

[0026] Figure 11B This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the second embodiment. Detailed Implementation

[0027] In Patent Document 1, the battery's charge level, used to determine the fuel cell's output, is a real-time measured value. Therefore, the invention described in Patent Document 1 does not consider future estimated values ​​of the battery's charge level when determining the fuel cell's output. As a result, the battery may be in a fully charged or fully discharged state. When the battery is fully charged, reverse current from the distributed power source to the power system is likely to occur. Conversely, when the battery is fully discharged, electricity may be purchased from the power system.

[0028] Therefore, the power control method of the first technical solution of this disclosure includes: when supplying power to the power load of a power consumer through a distributed power system equipped with a fuel cell device and an energy storage device, controlling the power generated by the fuel cell device to a planned value of the power generated by the fuel cell device; and when performing this control, performing a first correction to reduce the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value of the power generated by the fuel cell device is greater than an upper limit value less than 100%, or performing a second correction to increase the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value of the power generated by the fuel cell device is less than a lower limit value greater than 0%.

[0029] Based on the above, the power control method of this technical solution can reduce the possibility of the energy storage device being in a fully charged state or a fully discharged state compared with the past.

[0030] Specifically, the power control method of this technical solution, when executing the above control, performs a first correction to reduce the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value of the generated power from the fuel cell device is greater than an upper limit value less than 100%. This reduces the likelihood of the energy storage device reaching a fully charged state compared to not performing this first correction. When the energy storage device reaches a fully charged state, reverse current from the distributed power system to the power system is likely to occur, but the power control method of this technical solution can suppress the occurrence of this reverse current through the first correction.

[0031] Furthermore, the power control method of this technical solution, when performing the above control, performs a second correction by increasing the planned value when the charging rate of the energy storage device after a predetermined time based on the planned value of the generated power from the fuel cell device is less than a lower limit greater than 0%. This appropriately reduces the likelihood of the energy storage device becoming fully discharged compared to the case without this second correction. When the energy storage device is fully discharged, it is easy to purchase electricity from the power system, but the power control method of this technical solution can suppress this purchase through the second correction.

[0032] The power control method of the second technical solution disclosed herein can also be in the power control method of the first technical solution, where the first predetermined period of maintaining the first correction or the second correction is shorter than the second predetermined period of maintaining the planned value of the power generation of the fuel cell device.

[0033] The power control method of the third technical solution disclosed herein may also not perform the aforementioned first or second modification in the power control method of the first or second technical solution during a third predetermined period before the planned value of the power generation of the fuel cell device is switched or during a fourth predetermined period after the planned value is switched.

[0034] When a first correction or a second correction is performed during a predetermined period before or after the scheduled switching of the planned power generation value of the fuel cell device, the period during which the output of the fuel cell device changes based on the planned power generation value of the fuel cell device may sometimes overlap with the period during which the output of the fuel cell device changes based on the first correction or the second correction.

[0035] In other words, it takes time for the fuel cell device's output to reach the desired target value. If the first or second correction is executed at a time before the planned power generation value of the fuel cell device is switched, it's possible that the fuel cell device's output will change based on the planned power generation value while the output is fluctuating according to the first or second correction. Therefore, it's possible that the fuel cell device's output cannot be controlled according to the planned power generation value.

[0036] Furthermore, if the first or second correction is executed at a set time immediately after the planned power output of the fuel cell device is switched, it is possible that the output of the fuel cell device will change based on the first or second correction during a period when the output of the fuel cell device is changing according to the planned power output. Therefore, it is possible that the output of the fuel cell device will be difficult to control according to the correction of the fuel cell device's power output.

[0037] However, the power control method of this technical solution prohibits the execution of the first correction or the second correction during a third predetermined period before the planned value of the power generation of the fuel cell device is switched or during a fourth predetermined period after the planned value is switched. This makes it easier to properly control the output of the fuel cell device compared to the case where the first correction and the second correction are not prohibited.

[0038] The power control method of the fourth technical solution disclosed herein may also be in the power control method of the third technical solution, wherein the third or fourth predetermined period is a length longer than the time required from the time after switching the planned value of the power generation of the fuel cell device to the time until the output of the fuel cell device reaches the planned value after the switch.

[0039] Based on the above, the power control method of this technical solution, by setting the third predetermined period or the fourth predetermined period to be more than the time required from the switching of the planned value of the power generation of the fuel cell device to the time required for the output of the fuel cell device to reach the planned value after the switching, can appropriately reduce the possibility of overlap between the period of output change of the fuel cell device based on the planned value of the power generation of the fuel cell device and the period of output change of the fuel cell device based on the first correction or the second correction, compared with the case where the third predetermined period and the fourth predetermined period are less than the required time.

[0040] The power control method of the fifth technical solution disclosed herein may also, in the power control method of the first technical solution, not execute the first or second modification during the fifth predetermined period after the first modification or the second modification has been started.

[0041] For the fuel cell device to reach the desired output value, a certain amount of time is required. If the correction is executed again at a set time immediately after the first or second correction, it is possible that the output of the fuel cell device will change based on the latter correction while the output of the fuel cell device is changing based on the former correction. Therefore, it is possible that the output of the fuel cell device can be difficult to control according to the correction of the power generated by the fuel cell device.

[0042] However, the power control method of this technical solution, by prohibiting the re-execution of the first or second correction during a fifth predetermined period after the first or second correction has been executed, makes it easier to appropriately control the output of the fuel cell device compared to the case where the re-execution of the first or second correction is not prohibited.

[0043] The power control method of the sixth technical solution disclosed herein can also be used in the power control method of the first technical solution. In this case, the distributed power system also includes a solar power generation device. When performing the above control, the charging rate of the energy storage device after the predetermined time is estimated based on the difference between the actual value of the electricity demand of the electricity demander in the previously adjacent sixth predetermined period and the sum of the actual value of the electricity generated by the solar power generation device and the planned value of the electricity generated by the fuel cell device.

[0044] According to the above, in the power control method of this technical solution, the difference between the sum of the previous adjacent actual value of the electricity demand of the electricity demander and the previous adjacent actual value of the solar power generation device and the planned value of the power generation of the fuel cell device corresponds to the charging power or discharging power of the energy storage device. Therefore, the charging rate of the energy storage device after a predetermined time can be appropriately estimated based on this difference.

[0045] The seventh technical solution disclosed herein is a power control device for a distributed power system having a fuel cell device and an energy storage device, comprising: a memory storing a planned value of the power generated by the fuel cell device; and a controller that, when supplying power to the power load of a power consumer through the distributed power system, controls the power generated by the fuel cell device to the planned value of the power generated by the fuel cell device. When executing the above control, if the charging rate of the energy storage device after a predetermined time based on the planned value is greater than an upper limit value less than 100%, the controller performs a first correction that reduces the planned value; or if the charging rate of the energy storage device after a predetermined time based on the planned value is less than a lower limit value greater than 0%, the controller performs a second correction that increases the planned value.

[0046] Based on this configuration, the power control device of this technical solution can reduce the possibility of the energy storage device being in a fully charged or fully discharged state compared with the conventional one. Furthermore, the detailed effects achieved by the power control device of this technical solution are the same as those achieved by the power control method of the first technical solution; therefore, the description is omitted.

[0047] The power system of the eighth technical solution disclosed herein includes a fuel cell device, an energy storage device, and a power control device as described in the seventh technical solution.

[0048] Based on this configuration, the power supply system of this technical solution can reduce the possibility of the energy storage device being in a fully charged or fully discharged state compared to the conventional one. Furthermore, the detailed effects achieved by the power supply system of this technical solution are the same as those achieved by the power control method of the first technical solution; therefore, further explanation is omitted.

[0049] Hereinafter, specific examples of the above-described technical solutions of this disclosure will be described with reference to the accompanying drawings. The specific examples described below are merely illustrative of the above-described technical solutions of this disclosure. Therefore, unless otherwise stated in the claims, the shapes, numerical values, constituent elements, the arrangement of constituent elements, and connection methods shown below do not limit the scope of the claims.

[0050] Furthermore, elements not described in the independent claims representing the highest concept of this disclosure are explained as optional elements. Additionally, descriptions of elements labeled with the same reference numerals in the drawings are sometimes omitted. The drawings are schematic representations of the various elements for ease of understanding and are not always precise representations of shape and size ratios.

[0051] Furthermore, during the operation of the device, the order of steps can be changed or well-known steps can be added as needed.

[0052] (First Implementation)

[0053] [Device Composition]

[0054] Figure 1 This is a diagram illustrating an example of a power supply system according to the first embodiment. Figure 2 This is a diagram illustrating an example of a distributed power system provided by the power system of the first embodiment. Figure 3 This is a diagram illustrating an example of the power control device according to the first embodiment.

[0055] like Figure 1 As shown, the power supply system 10 of this embodiment includes a power control device 20 and a distributed power supply system 30. Here, as... Figure 2As shown, the distributed power system 30 includes a fuel cell unit 31 and an energy storage device 32. This power system 10 can also be, for example, a system that supplies large amounts of electricity to an electrical system. In this case, the fuel cell unit 31 and the energy storage device 32 each include a fuel cell unit group comprising multiple fuel cell units and a battery unit group comprising multiple battery units, respectively. Each of the multiple fuel cell units includes a fuel cell stack. A detailed description of such a power system 10 will be provided in the second embodiment.

[0056] The fuel cell unit 31 generates electricity using hydrogen supplied from a hydrogen supply source (not shown) under the control of the power control device 20. The electricity generated by the fuel cell unit 31 is supplied to the power load 40, the power system, or the energy storage device 32. Well-known devices can be used as the fuel cell unit 31. Examples of hydrogen supply sources include, but are not limited to, hydrogen storage devices.

[0057] The energy storage device 32 is a device that stores electricity generated by the fuel cell device 31 or electricity received from the power system, under the control of the power control device 20. The electricity stored in the energy storage device 32 can also be discharged to the power load 40 of the electricity consumer or the power system under the control of the power control device 20. Examples of electricity consumers who receive electricity from the power system 10 include, but are not limited to, factories, shops, and ordinary households.

[0058] The energy storage device 32 can send a SOC (State of charge) to the power control device 20 at appropriate timings. The SOC represents the remaining amount of electricity (charge) stored in the energy storage device 32. Examples of energy storage devices 32 include, for example, secondary batteries, but are not limited to, them.

[0059] like Figure 3 As shown, the power control device 20 includes a memory 21 and a controller 22.

[0060] Memory 21 is used to store the planned value FC of the generated electricity FC of fuel cell device 31. main The memory. For example, the power control device 20 can also receive data from a terminal or server via a communication network, which corresponds to the planned value FC. main The relevant power generation plan.

[0061] Furthermore, the users of the aforementioned terminals or servers include direct or indirect users of the power control device 20. Direct users of the power control device 20 include, for example, the manager of the power control device 20. Indirect users of the power control device 20 can include, for example, the owner of the power system 10. This owner can be either a power consumer receiving services from electricity generated by the power system 10, or a power generator using the power system 10 to supply electricity to power consumers.

[0062] When the controller 22 supplies power to the power load 40 of the power consumer through the distributed power system 30, it controls the generated power FC of the fuel cell device 31 to the planned value FC of the generated power FC of the fuel cell device 31. main Additionally, when executing this control, controller 22 determines the planned value FC of the generated electricity FC from fuel cell device 31. main The SOC of the energy storage device 32 after the estimated predetermined time. lator Smaller than 100% and smaller than the upper limit of SOC upper When the value is large, the execution will make the planned value FC. main The first reduction, or when based on the planned value FC main The SOC of the energy storage device 32 after the estimated predetermined time. lator Greater than 0% and greater than the lower limit of SOC lower Hours, execution makes the planned value FC main The second amendment was added.

[0063] "Upper limit SOC" upper "and "lower limit SOC" lower "The appropriate value can be set based on the configuration of the power system 10, etc. This is the 'upper limit SOC' value." upper For example, approximately 90% can be cited as the "lower limit SOC". lower For example, one could cite about 10%.

[0064] The "scheduled time" can be set to an appropriate period based on the configuration of the power system 10, etc. For example, a "scheduled time" of approximately 60 minutes can be given.

[0065] Specific examples of the "first modification" and the "second modification" will be described in the second embodiment.

[0066] The controller 22 can be any controller with control functions, including an arithmetic processing unit (not shown) and a storage unit (not shown) for storing control programs. The arithmetic processing unit reads and executes the control program stored in the storage unit, performing predetermined control within the controller 22. For example, a microprocessor can be used as the arithmetic processing unit. For example, a memory can be used as the storage unit.

[0067] [action]

[0068] Figure 4A and Figure 4B This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the first embodiment. Figure 5 This is a diagram illustrating an example of the operation (power control method) of the power control device of the first embodiment.

[0069] The following actions can be performed, for example, by reading the control program from the storage unit of the controller 22 through the arithmetic processing unit of the controller 22. However, it is not always necessary for the controller 22 to perform the following actions. An operator may also perform a portion of the actions. The following examples illustrate the case where actions are controlled by the controller 22.

[0070] The following is about Figure 4A The operation of the power control device 20 will be explained.

[0071] First, the planned value FC of the generated electricity FC from the fuel cell device 31 is received via a communication network. main .

[0072] Then, when supplying power to the power load 40 of the power demanders through the distributed power system 30, such as Figure 4A As shown, in step S1, the generated power FC of the fuel cell device 31 is controlled to the planned value FC of the generated power FC of the fuel cell device 31. main The action.

[0073] Next, during the control process of step S1, in step S2A, the planned value FC of the generated electricity FC from the fuel cell device 31 is determined. main The SOC of the energy storage device 32 after the estimated predetermined time. lator Is it greater than the upper limit value of SOC less than 100%? upper .

[0074] Here, "scheduled time" can be, for example, approximately 60 minutes, but is not limited to this. "Maximum SOC" upper "For example, it could be around 90%, but it's not limited to that."

[0075] At the SOC of the energy storage device 32lator SOC greater than or equal to 100% upper When (if "Yes" is set in step S2A), in step S3A, the planned value FC of the power generation FC of the fuel cell device 31 is calculated. main The reduction correction. Specifically, the correction value FC for calculating the generated power FC of fuel cell device 31. sub The planned value of the power generation FC of the fuel cell device 31 is revised. main That is, by adjusting the planned value FC main Add correction value FC sub To calculate the total, we can obtain the generated power FC of the fuel cell device 31 (FC = FC). main +FC sub The above amendment is an example of the “first amendment” of this disclosure.

[0076] For example, Figure 5 As shown, the planned value FC of the power generation FC of the fuel cell device 31 is... main The SOC of the 300kW energy storage device 32 is achieved. lator At time [0:20], the upper limit value SOC is... upper SOC lator >SOC upper The correction value FC of the power generated by the fuel cell device 31 sub After being calculated as -20kW, the power generation FC of fuel cell device 31 is corrected to 280kW (FC = 300kW - 20kW). Furthermore, -20kW is used as a threshold for SOC. lator Becoming a SOC upper The following values ​​are used for calculation.

[0077] In addition, the planned value of the power generation FC of the fuel cell device 31 is FC. main The SOC of the 300kW energy storage device 32 is achieved. lator At time [0:25], the upper limit value SOC is... upper SOC lator >SOC upper The correction value FC of the power generated by the fuel cell device 31 sub After being calculated as -15kW, the power generation FC of fuel cell device 31 is corrected to 285kW (FC = 300kW - 15kW). Furthermore, -15kW is used as a threshold for SOC. lator Becoming a SOC upper The following values ​​are used for calculation.

[0078] In addition, the planned value of the power generation FC of the fuel cell device 31 is FC.main The SOC of the 350kW energy storage device 32 is achieved. lator At time [1:00], the upper limit SOC is... upper SOC lator >SOC upper The correction value FC of the power generated by the fuel cell device 31 sub After being calculated as -5kW, the power generation FC of fuel cell device 31 is corrected to 345kW (FC = 350kW - 5kW). Furthermore, -5kW is used to achieve SOC... lator Becoming a SOC upper The following values ​​are used for calculation.

[0079] At the SOC of the energy storage device 32 lator No greater than the upper limit value of SOC less than 100% upper When (if "No" is set in step S2A), the planned value FC of the power generated by the fuel cell device 31 is... main It was kept as it was.

[0080] The following is about Figure 4B The operation of the power control device 20 will be explained.

[0081] First, the planned value FC of the generated electricity FC from the fuel cell device 31 is received via a communication network. main .

[0082] Then, when supplying power to the power load 40 of the power demanders through the distributed power system 30, such as Figure 4B As shown, in step S1, the generated power FC of the fuel cell device 31 is controlled to a planned value FC. main The action.

[0083] Next, during the control process of step S1, in step S2B, the planned value FC of the generated electricity FC from the fuel cell device 31 is determined. main The SOC of the energy storage device 32 after the estimated predetermined time. lator Is it less than the lower limit SOC greater than 0%? lower .

[0084] Here, "scheduled time" can be, for example, approximately 60 minutes, but is not limited to this. "Lower limit SOC" lower "For example, it could be around 10%, but it is not limited to that."

[0085] At the SOC of the energy storage device 32 lator less than the lower limit SOC greater than 0%. lowerWhen (if "Yes" is set in step S2B), in step S3B, the planned value FC of the power generation FC of the fuel cell device 31 is set. main The correction is added. Specifically, the correction value FC for calculating the generated power FC of fuel cell device 31 is adjusted. sub The planned value of the power generation FC of the fuel cell device 31 is revised. main That is, by adjusting the planned value FC main Add correction value FC sub To calculate the total, we can obtain the generated power FC of the fuel cell device 31 (FC = FC). main +FC sub The above amendment is an example of the "second amendment" of this disclosure.

[0086] For example, Figure 5 As shown, the planned value FC of the power generation FC of the fuel cell device 31 is... main The SOC of the 300kW energy storage device 32 is achieved. lator At time [0:45], the lower limit value SOC is... lower Hours (SOC) lator <SOC lower The correction value FC of the power generated by the fuel cell device 31 sub After being calculated as +10kW, the power generation FC of fuel cell device 31 is corrected to 310kW (FC = 300kW + 10kW). Furthermore, +10kW is used to achieve SOC. lator Becoming a SOC lower The above values ​​were used for calculation.

[0087] In addition, the planned value of the power generation FC of the fuel cell device 31 is FC. main The SOC of the 300kW energy storage device 32 is achieved. lator At time [0:55], the lower limit SOC value is... lower Hours (SOC) lator <SOC lower The correction value FC of the power generated by the fuel cell device 31 sub After being calculated as +5kW, the power generation FC of fuel cell device 31 is corrected to 305kW (FC = 300kW + 5kW). Furthermore, +5kW is used to achieve SOC. lator Becoming a SOC lower The above values ​​were used for calculation.

[0088] At the SOC of the energy storage device 32 lator Not less than the lower limit SOC greater than 0%. lowerWhen (if "No" is set in step S2B), the planned value FC of the power generated by the fuel cell device 31 is... main It was kept as it was.

[0089] also, Figure 5 The "various moments" and "planned value FC" shown main "and "correction value FC" sub "etc." are examples and are not limited to this example. Additionally, regarding the "SOC" mentioned above... lator "and "correction value FC sub A specific example of the calculation method for “” will be explained in the second embodiment.

[0090] According to the above-described embodiment, the possibility of the energy storage device 32 being in a fully charged state or a fully discharged state can be reduced compared to the conventional method.

[0091] Specifically, the planned value FC of the generated electricity FC of the fuel cell device 31 is controlled to be FC. main When the planned value of the generated electricity FC based on the fuel cell device 31 is FC main SOC of the energy storage device after the estimated predetermined time lator SOC greater than or equal to 100% upper At that time, the planned value FC is made. main The reduction in charge appropriately reduces the likelihood of the energy storage device 32 becoming fully charged compared to the case without such a reduction. When the energy storage device 32 is fully charged, reverse current is likely to occur from the distributed power system 30 to the power system, but according to this embodiment, the above-described reduction can suppress the occurrence of such reverse current.

[0092] In addition, the planned value FC of the generated electricity FC of the fuel cell device 31 is controlled to be FC. main When the planned value of the generated electricity FC based on the fuel cell device 31 is FC main The SOC of the energy storage device 32 after the estimated predetermined time. lator less than the lower limit SOC greater than 0%. lower At that time, the planned value FC is made. main The added correction appropriately reduces the likelihood of the energy storage device 32 becoming fully discharged compared to the case without the correction. When the energy storage device 32 is fully discharged, it is easy to purchase electricity from the power system, but according to this embodiment, the above-described correction can suppress the occurrence of such electricity purchases.

[0093] (First embodiment)

[0094] The power control method in this embodiment is the same as that in the first embodiment, except for the control content of the controller 22 described below.

[0095] Figure 6 This is a diagram illustrating an example of the operation of the power control device (power control method) in the first embodiment of the first implementation.

[0096] like Figure 6 As shown, maintain Figure 4A The planned value FC of step S3A main Correction or Figure 4B The planned value FC of step S3B main The revised scheduled period T sub Compared to the planned value FC of the power generated by the fuel cell unit 31. main The scheduled period T main short.

[0097] Here, “the scheduled period T” sub This is an example of the "first scheduled period" in this disclosure. "Scheduled period T" main This is an example of the "second predetermined period" of this disclosure, which is fixed to an appropriate length to suppress the reduction of the lifespan of the fuel cell device 31. As the "predetermined period T" main For example, one could say about 60 minutes, but it's not limited to that.

[0098] For example, in Figure 6 In this context, the planned value of the electricity generated by the fuel cell device 31 is FC. main The scheduled period T was maintained at 300kW. main It shows the 60 minutes between time [0:00] and time [1:00].

[0099] In addition, Figure 6 In this context, the planned value of the electricity generated by the fuel cell device 31 is FC. main The scheduled period T was maintained at 350kW. main It shows 60 minutes from time [1:00] to time [2:00].

[0100] exist Figure 6 In the middle, as a means of maintaining Figure 4A The planned value FC of step S3A main Correction (FC) main -20kW) scheduled period T sub This shows the 5 minutes between time [0:20] and time [0:25].

[0101] In addition, as a means of maintaining Figure 4A The planned value FC of step S3A main Correction (FC) main -15kW) during the scheduled period T sub This shows the 20 minutes between time [0:25] and time [0:45].

[0102] That is, after performing the planned value FC main Correction (FC) main -20kW) after that, during the scheduled period T main The planned value FC was executed during the 60-minute period. main Further revisions (FC) main In the case of -15kW), the former's correction (FC) main (-20kW) was reset.

[0103] In addition, Figure 6 In the middle, as a means of maintaining Figure 4B The planned value FC of step S3B main Correction (FC) main +10kW) during the scheduled period T sub This shows the 10 minutes between time [0:45] and time [0:55].

[0104] In addition, as a means of maintaining Figure 4B The planned value FC of step S3B main Correction (FC) main +5kW) during the scheduled period T sub It shows the 5 minutes between time [0:55] and time [1:00].

[0105] That is, after performing the planned value FC main Correction (FC) main +10kW) after that, during the scheduled period T main The planned value FC was executed during the 60-minute period. main Further revisions (FC) main In the case of +5kW), the former's correction (FC) main (+10kW) was reset.

[0106] Furthermore, in Figure 6 In the middle, as a means of maintaining Figure 4A The planned value FC of step S3A main Correction (FC) main -5kW) during the scheduled period T sub It shows the 60 minutes between time [1:00] and time [2:00].

[0107] That is, the planned value FC of the power generation FC of the fuel cell device 31. main Switching timing and execution Figure 4A Correction of step S3A (FC) main When the timing of -5kW is simultaneous, this correction is performed (FC). main -5kW).

[0108] After this amendment (FC) was made main -5kW) after that, as long as the planned value FC is not executed main Further revisions will be made during the scheduled period T. main This correction will continue during the 60-minute period (FC). main -5kW). Furthermore, this modification (FC) main -5kW) of planned power generation FC in fuel cell unit 31 main The switching timer was reset.

[0109] also, Figure 6 The terms "various times", "various periods", and "planned value FC" are shown. main "and "correction value FC" sub "etc." are examples and are not limited to this example.

[0110] According to this embodiment, the planned value FC of the generated electricity FC of the fuel cell device 31 is maintained. main The scheduled period T main The predetermined period is fixed to a relatively long period (e.g., 60 minutes), which is advantageous for extending the lifespan of the fuel cell device 31. That is, the more frequently the output of the fuel cell device 31 changes, the more easily the fuel cell deteriorates. Therefore, in this embodiment, by fixing the predetermined period T... main By fixing the length to an appropriate level, the number of times the output of the fuel cell device 31 changes is appropriately limited.

[0111] In addition, maintain Figure 4A The planned value FC of step S3A main Correction or Figure 4B The planned value FC of step S3B main The revised scheduled period T sub Compared to the planned value FC of the power generated by the fuel cell unit 31. main The scheduled period T main Short, but the corrected value of the power generation FC of the fuel cell device 31 is FC. sub The planned value of the power generation FC of the fuel cell device 31 main The changes are small, therefore, the impact on the lifespan of the fuel cell device 31 is minimal.

[0112] The above results, according to this embodiment, are consistent with the planned value FC for maintaining the power generation FC of the fuel cell device 31. main The scheduled period T main Compared to short-term, high-frequency changes, this can extend the lifespan of the fuel cell device 31.

[0113] Except for the features described above, the power control method, power control device 20, and power supply system 10 of this embodiment are the same as those of the first embodiment.

[0114] (Second Embodiment)

[0115] The power control method in this embodiment is the same as that in the first embodiment, except for the control content of the controller 22 described below.

[0116] Figure 7 This is a diagram illustrating an example of the operation of the power control device (power control method) in the second embodiment of the first embodiment.

[0117] like Figure 7 As shown, the planned value FC of the power generation FC of the fuel cell device 31 is... main During the previous scheduled period (TA), the process will not be executed. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main The amendment. “The scheduled period TA” is an example of the “third scheduled period” in this disclosure.

[0118] In addition, the planned value of the power generation FC of the fuel cell device 31 is FC. main During the scheduled period TB after the switch, it will not be executed. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main The amendment. “The scheduled period TB” is an example of the “fourth scheduled period” of this disclosure.

[0119] exist Figure 7 In the example shown, "predetermined period TA" includes the time [0:55], therefore, even at the SOC of the energy storage device 32... lator Compared to the lower limit SOC lower In minor cases, it is not implemented. Figure 4B The planned value FC of step S3B main Corrections.

[0120] Furthermore, the planned value of the power generation FC of the fuel cell device 31 is FC. main The switching timing, as described above, is based on the execution plan value FC. mainThe correction. For example, such as Figure 7 As shown, at time [1:00], the planned value FC main The power was switched from 300kW to 350kW and was modified (FC). main -5kW).

[0121] Here, "scheduled period TA" or "scheduled period TB" can be the planned value FC of the generated electricity from the fuel cell unit 31. main After the switch is performed, the output of the fuel cell unit 31 reaches the planned value FC after the switch. main The length of time required up to that point. "Predetermined period TA" and "Predetermined period TB" can be, for example, the time until the output of fuel cell device 31 reaches the desired target value by starting up the standby fuel cell unit in fuel cell device 31.

[0122] also, Figure 7 The terms "various times", "various periods", and "planned value FC" are shown. main "and "correction value FC" sub "etc." are examples and are not limited to this example.

[0123] The planned value of the power generation FC of the fuel cell device 31 main Executed during the scheduled period before and after the switching time. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main In the case of corrections, sometimes the planned value FC of the generated electricity FC of the fuel cell device 31 is based on the actual power output FC. main The period of output variation of fuel cell device 31 overlaps with the period of output variation of fuel cell device 31 based on the above correction.

[0124] In other words, it takes a certain amount of time for the output of the fuel cell device 31 to reach the desired target value, which is the planned value of the power generation FC of the fuel cell device 31. main If the aforementioned correction is performed at the scheduled time before the switch, it is possible that during the period when the output of the fuel cell device 31 is changing based on this correction, the planned value FC of the generated electricity FC from the fuel cell device 31 may be affected. main This indicates changes in the output of the fuel cell device. Therefore, it is possible that the output of the fuel cell device 31 cannot be controlled according to the planned power generation (FC) of the fuel cell device 31.

[0125] In addition, the planned value of the power generation FC of the fuel cell device 31 is FC. main Scheduled execution immediately after switching Figure 4AStep S3A or Figure 4B The planned value FC of step S3B main Under the revised conditions, it is possible to achieve the planned value FC of the power generation FC based on the fuel cell device 31. main While the output of the fuel cell device is changing, the output of the fuel cell device 31 is indicated to change based on the aforementioned correction. Therefore, it is possible that the output of the fuel cell device 31 cannot be controlled according to the correction of the generated electricity FC of the fuel cell device 31.

[0126] However, according to this embodiment, the planned value FC of the power generated by the fuel cell device 31 is... main Switch to the previous scheduled period TA or the planned value FC main During the scheduled period TB after the switch, execution is prohibited. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main The correction makes it easier to properly control the output of the fuel cell device 31 compared to the case where the correction is not prohibited.

[0127] Furthermore, according to this embodiment, the predetermined period TA or predetermined period TB is set to the planned value FC of the power generation FC of the fuel cell device 31. main After the switch was performed, the output of the fuel cell unit 31 reached the planned value FC after the switch. main The planned value FC of the generated electricity FC based on the fuel cell device 31 can be appropriately reduced compared to the case where the planned period TA and the planned period TB are less than the required time. main The duration of the output variation of the fuel cell device 31 is related to... Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main The possibility of overlapping during the correction of the output variation of the fuel cell device 31.

[0128] Except for the features described above, the power control method, power control device 20, and power supply system 10 of this embodiment may be the same as those of the first embodiment or the first embodiment of the first embodiment.

[0129] (Third embodiment)

[0130] The power control method in this embodiment is the same as that in the first embodiment, except for the control content of the controller 22 described below.

[0131] Figure 8This is a diagram illustrating an example of the operation of the power control device (power control method) in the third embodiment of the first embodiment.

[0132] like Figure 8 As shown, at the start of execution Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main Following the revision, it will not be implemented during the scheduled period TC. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main The amendment. “Pre-scheduled period TC” is an example of the “fifth pre-scheduled period” of this disclosure.

[0133] exist Figure 8 In the example shown, the time [0:25] is included in the "predetermined period TC", therefore, even at the SOC of the energy storage device 32... lator Compared to the upper limit SOC upper In major cases, it is not implemented. Figure 4A The planned value FC of step S3A main Corrections.

[0134] Here, "predetermined period TC" can be, for example, the time until the output of fuel cell device 31 reaches the desired target value by starting up the standby fuel cell unit in fuel cell device 31.

[0135] also, Figure 8 The terms "various times", "various periods", and "planned value FC" are shown. main "and "correction value FC" sub "etc." are examples and are not limited to this example.

[0136] For the output of the fuel cell device 31 to reach the desired target value, a certain amount of time is required, which occurs immediately after execution. Figure 4A Step S3A or Figure 4B The planned value FC of step S3B main If the correction is executed again at a later time after the previous correction, it is possible that the output of the fuel cell device 31 will change based on the latter correction while the output of the fuel cell device 31 is changing based on the former correction. Therefore, it is possible that the output of the fuel cell device 31 will be difficult to control according to the correction of the generated electricity FC of the fuel cell device 31.

[0137] However, according to this embodiment, at the start of execution Figure 4A Step S3A or Figure 4B The planned value FC of step S3B mainFollowing the modification, by prohibiting the re-execution of the modification during the predetermined period of TC, it is equivalent to not prohibiting the re-execution. Figure 4A Step S3A and Figure 4B The planned value FC of step S3B main Compared to the situation where corrections are made, it is easier to appropriately control the output of the battery device 31.

[0138] Except for the features described above, the power control method, power control device 20, and power supply system 10 of this embodiment may be the same as any of the first embodiment and the first to second embodiments of the first embodiment.

[0139] (Fourth embodiment)

[0140] The power control method in this embodiment is the same as that in the first embodiment, except for the configuration of the distributed power system 130 and the control content of the controller 22 described below.

[0141] Figure 9 This is a diagram illustrating an example of a distributed power system provided by the power system of the fourth embodiment of the first embodiment.

[0142] like Figure 9 As shown, the distributed power system 130 includes a fuel cell device 31, an energy storage device 32, and a solar power generation device 33. Here, the configuration of the fuel cell device 31 and the energy storage device 32 is the same as in the first embodiment, therefore, description is omitted.

[0143] The solar power generation device 33 is an electrical device that converts solar energy into electricity using sunlight, controlled by the power control device 20. The electricity generated by the solar power generation device 33 is supplied to the electrical load 40, the power system, or the energy storage device 32. Well-known devices can be used as the solar power generation device 33.

[0144] The power system 10 can also be, for example, a system that supplies a large amount of electricity to an electrical system. In this case, the fuel cell device 31, the solar power generation device 33, and the energy storage device 32 each have a fuel cell unit group including multiple fuel cell units, a solar cell group including multiple solar cells, and a battery unit group including multiple battery units. The multiple fuel cell units each include a fuel cell stack, and the multiple solar cells each include a solar cell panel. However, the detailed configuration of such a power system 10 will be described in the second embodiment.

[0145] In this embodiment, the planned value FC of the generated power FC of the fuel cell device 31 is controlled to be FC. mainAt that time, based on the actual value of the electricity demand of the electricity demanders in the previously adjacent scheduled period TD, the actual value of the electricity generated by the solar power generation device 33 FC, and the planned value of the electricity generated by the fuel cell device 31 FC, the electricity demand of the electricity demanders in the previously adjacent scheduled period TD is calculated. main The difference between the sums is used to estimate the SOC of the energy storage device 32 after a predetermined time. lator "Scheduled period TD" is an example of the "sixth scheduled period" of this disclosure. As a "scheduled period TD", for example, approximately 15 minutes may be cited, but it is not limited to this.

[0146] Here, the electricity demand of the aforementioned electricity consumers and the electricity generated by the solar power generation device 33 are measured by the controller 22 at an appropriate sampling period, and this sampling data is stored as actual values ​​in the electricity database. Thus, the controller 22 can obtain the actual values ​​of the electricity demand of the electricity consumers and the actual values ​​of the electricity generated by the solar power generation device 33 during a predetermined period (TD) from the electricity database.

[0147] According to this embodiment, the electricity demand of the electricity consumer is compared with the previous adjacent actual value of the solar power generation device 33 and the planned value FC of the power generation of the fuel cell device 31. main The difference between the sums corresponds to the charging or discharging power of the energy storage device 32. Therefore, the state of charge (SOC) of the energy storage device 32 after a predetermined time can be appropriately estimated based on this difference. lator .

[0148] Except for the features described above, the power control method, power control device 20, and power supply system 10 of this embodiment may be the same as any of the first embodiment and the first to third embodiments of the first embodiment.

[0149] (Second Implementation)

[0150] [Device Composition]

[0151] Figure 10 This is a diagram illustrating an example of a power supply system according to the second embodiment. Figure 10 In the diagram, for ease of explanation, solid lines and dashed lines represent the paths for power transmission and signal transmission, respectively.

[0152] like Figure 10 As shown, the power system 10 of this embodiment includes a power control device 20, a fuel cell device 31, an energy storage device 32, a solar power generation device 33, and control devices 50A to 50C.

[0153] Here, the configuration of the power control device 20 is the same as in the first embodiment, therefore, detailed description is omitted.

[0154] exist Figure 10 In the example shown, the fuel cell device 31 includes a fuel cell unit group comprising multiple fuel cell units. This fuel cell unit group is divided into multiple groups, and the multiple fuel cell units within each group are connected to the power system via a power regulator (PCS) and a power meter. The power meter is connected to the power control device 20 via a communication network. The number of fuel cell units in each group is set to an appropriate value based on the output specifications of the power system 10, etc.

[0155] Furthermore, although the illustrations are omitted, these fuel cell units consist of fuel cell stacks, pumps, valves, and other auxiliary equipment, as well as control devices that control the operation of these devices. Additionally, even without a control device within the fuel cell unit, the operation of the aforementioned equipment can be directly controlled via control device 50A.

[0156] The solar power generation device 33 includes a solar cell array comprising multiple solar cells, each solar cell including a solar panel. The solar cell array is grouped into multiple groups, and the solar cells within each group are connected to the power system via a power regulator (PCS) and a power meter. The power meter is connected to the power control device 20 via a communication network. The number of solar cells in each group is set to an appropriate value based on the output specifications of the power system 10, etc.

[0157] The energy storage device 32 includes a battery cell group comprising multiple battery cells. This battery cell group is grouped into multiple sets, and the battery cells within each set are connected to the power system via power lines through a power regulator (PCS) and a power meter. The power meter is connected to the power control device 20 via a communication network. The number of battery cells in each set is set to an appropriate value based on the output specifications of the power system 10.

[0158] Furthermore, the fuel cell unit 31, the energy storage unit 32, and the solar power generation unit 33 are interconnected in parallel via the power system, and are also connected to the power load 40 of the power consumer via a power meter. This power meter is connected to the power control device 20 via a communication network.

[0159] However, the above configuration of the power system 10 is illustrative and not limited to this example. For example, the fuel cell unit group can be grouped by multiple fuel cell units in a single group, or by individual fuel cell units within each group. The solar cell group can be grouped by multiple solar cells in a single group, or by individual solar cells within each group. The battery unit group can be grouped by multiple battery units in a single group, or by individual battery units within each group.

[0160] Control devices 50A to 50C are respectively installed corresponding to fuel cell device 31, energy storage device 32 and solar power generation device 33, and are connected to power control device 20 through communication network.

[0161] For example, control device 50A controls the output of each of these fuel cell units via a communication network to enable efficient operation of the fuel cell units (e.g., lifespan optimization). Additionally, control device 50C can adjust the output of the solar power generation device 33 by controlling the power regulator (PCS) via a communication network, and can also offload or parallel a desired number of solar cells relative to the power system.

[0162] However, the above is illustrative and not limited to this example. For example, it could also be the controller 22 of the power control device 20 (see [reference]). Figure 3 The power control device 20 can directly control the operation of the devices corresponding to the control devices 50A to 50C without going through the control devices 50A to 50C. In addition, the power control device 20 can also be integrated with the control devices 50A to 50C. In other words, it can be equipped with the control functions of the control devices 50A to 50C and directly control the operation of the devices corresponding to the control devices 50A to 50C.

[0163] Control devices 50A to 50C only need to have control functions, and include an arithmetic processing unit (not shown), a storage unit for storing control programs, and a communicator. The arithmetic processing unit reads and executes the control program stored in the storage unit, thereby performing predetermined control in the control devices 50A to 50C. For example, a microprocessor can be used as the arithmetic processing unit. For example, a memory can be used as the storage unit.

[0164] [action]

[0165] Figure 11A and Figure 11B This is a flowchart illustrating an example of the operation (power control method) of the power control device according to the second embodiment.

[0166] The following actions can also be performed by reading the control program from the storage unit of the controller 22 through the arithmetic processing unit of the controller 22. However, it is not always necessary for the controller 22 to perform the following actions. An operator may also perform a portion of the actions. The following examples illustrate the case where actions are controlled by the controller 22.

[0167] The following is about Figure 11A The operation of the power control device 20 will be explained.

[0168] First, in step S11, the planned value FC of the power generation FC of the fuel cell device 31 is obtained from the power database. main The sampling period includes the charge rate (SOC) of the energy storage device 32, the power demand (D) during the sampling period (predetermined period TD), and the power generated by the solar cells (PV). Furthermore, the sampling period (TD) is set to be shorter than the predetermined time (T) described later. For example, approximately 15 minutes can be cited as a "sampling period," but it is not limited to this.

[0169] Then, in step S12, the moving average D of the electricity demand D during the sampling period (predetermined period TD) is calculated. ave The moving average of solar-generated electricity PV ave .

[0170] Next, in step S13, B is calculated using the following formula (1). pre1 B pre1 It is the charging or discharging power of the energy storage device 32.

[0171] B pre1 =D ave - (PV) ave +FC main )・・・(1)

[0172] In addition, B pre1 A value greater than 0 indicates the discharge power of the energy storage device 32, B. pre1 <0 means the charging power of the energy storage device 32.

[0173] Next, in step S14, the charge rate SOC of the energy storage device 32 after a predetermined time (T) is calculated using the following formula (2). lator Here, from the viewpoint of suppressing the reduction in the lifespan of the fuel cell device 31, the "predetermined time (T)" can be the planned value FC for maintaining the power generation FC of the fuel cell device 31. main The scheduled period T main The same length. As a scheduled time (T), it can be approximately 60 minutes, but is not limited to this.

[0174] SOC lator =SOC-(B pre1 ×T) / Storage device capacity・・・(2)

[0175] Next, in step S15A, the state of charge (SOC) is determined. lator Is it higher than the upper limit SOC? upper big.

[0176] At SOC lator Compared to the upper limit SOC upper In the case of a large value (if "yes" is set in step S15A), B is calculated in step S16A. pre2 B pre2 It is the charging power or discharging power of the energy storage device 32 that satisfies the following formula (3A).

[0177] SOC upper =SOC-(B pre2 ×T) / Energy storage device capacity・・・(3A)

[0178] In addition, B pre2 A value greater than 0 indicates the discharge power of the energy storage device 32, B. pre2 <0 means the charging power of the energy storage device 32.

[0179] Next, in step S17A, a correction value FC for the generated power FC of the fuel cell device 31 that satisfies the following equation (4A) is calculated. sub (FC) sub <0).

[0180] B pre2 =D ave - (PV) ave +FC main +FC sub ) ・・・(4A)

[0181] Then, in step S18A, the power generation FC of the fuel cell device 31 is calculated by the following formula (5A), and the power generation FC is modified according to the planned value of the power generation of the fuel cell device 31, conditioned on the timing of the "predetermined period TA" and "predetermined period TB" of the second embodiment which is not part of the first embodiment and the "predetermined period TC" of the third embodiment of the first embodiment.

[0182] FC = FC main +FC sub ・・・(5A)

[0183] On the other hand, at the state of charge (SOC) lator Not greater than the upper limit SOCupper In the case where (if "No" is set in step S15A), the power generation FC of the fuel cell device 31 is maintained as is. Furthermore, in the above, FC... sub Determined to achieve SOC (State of Charge) lator Compared with the upper limit SOC upper Equal, but not limited to this. FC can also be determined. sub To achieve a SOC (State of Charge) lator It becomes less than the upper limit value SOC upper .

[0184] The following is about Figure 11B The operation of the power control device 20 will be explained.

[0185] also, Figure 11B Steps S11 to S14 and Figure 11A Steps S11 to S14 are the same, therefore, the explanation is omitted.

[0186] In step S15B, the state of charge (SOC) is determined. lator Is it lower than the lower limit SOC? lower Small.

[0187] At SOC lator Compared to the lower limit SOC lower In the case of a small value (if "yes" is set in step S15B), B is calculated in step S16B. pre2 B pre2 It is the charging power or discharging power of the energy storage device 32 that satisfies the following formula (3B).

[0188] SOC lower =SOC-(B pre2 ×T) / Energy storage device capacity・・・(3B)

[0189] Next, in step S17B, a correction value FC for the generated power FC of the fuel cell device 31 that satisfies the following equation (4B) is calculated. sub (FC) sub >0).

[0190] B pre2 =D ave - (PV) ave +FC main +FC sub ) ・・・(4B)

[0191] Then, in step S18B, the power generation FC of the fuel cell device 31 is calculated using the following formula (5B). Under the condition that the timing is within the "predetermined period TA" and "predetermined period TB" of the second embodiment which is not part of the first embodiment and the "predetermined period TC" of the third embodiment of the first embodiment, the power generation FC of the fuel cell device 31 is modified according to the planned value.

[0192] FC = FC main +FC sub ・・・(5B)

[0193] On the other hand, at the state of charge (SOC) lator Not compared to the lower limit of SOC lower In the case of a small power output (if "No" is specified in step S15B), the power generation FC of the fuel cell device 31 is maintained as before. Furthermore, in the above description, FC... sub Determined to achieve SOC (State of Charge) lator Compared with the upper limit SOC lower Equal, but not limited to this. FC can also be determined. sub To achieve a SOC (State of Charge) lator Becomes lower limit SOC lower big.

[0194] The effects of the power control method, power control device 20, and power supply system 10 in this embodiment can be easily understood from the description of the effects of the power control device 20 and power supply system 10 in the first embodiment; therefore, the description is omitted.

[0195] The power control method, power control device 20, and power supply system 10 of this embodiment, except for the features described above, may be the same as those in the first embodiment and any of the first to fourth embodiments of the first embodiment.

[0196] The first embodiment, the first to fourth embodiments of the first embodiment, and the second embodiment can be combined with each other as long as they do not exclude each other. Based on the above description, those skilled in the art will clearly understand many improvements and other embodiments of this disclosure. Therefore, the above description should be interpreted as illustrative only, provided for the purpose of teaching those skilled in the art the best technical solution for implementing this disclosure. Details that allow for substantial changes to the structure and / or function without departing from the spirit of this disclosure are included.

[0197] Industrial availability

[0198] One technical solution disclosed herein can be used in power control methods, power control devices, and power supply systems that can reduce the possibility of the energy storage device being in a fully charged or fully discharged state compared to the past.

[0199] Explanation of reference numerals in the attached figures

[0200] 10: Power System

[0201] 20: Power control device

[0202] 21: Memory

[0203] 22: Controller

[0204] 30: Distributed power supply systems

[0205] 31: Fuel cell device

[0206] 32: Energy storage device

[0207] 33: Solar power generation device

[0208] 40: Electrical load

[0209] 50A: Control device

[0210] 50B: Control device

[0211] 50C: Control device

[0212] 130: Distributed power systems

Claims

1. A power control method, comprising: When supplying power to the power load of a power consumer through a distributed power system equipped with a fuel cell device and an energy storage device, the step of controlling the generated power of the fuel cell device to the planned value of the generated power of the fuel cell device. and When performing the control, if the charging rate of the energy storage device after a predetermined time based on the planned value is greater than an upper limit value less than 100%, a first correction is performed to reduce the planned value; or if the charging rate of the energy storage device after a predetermined time based on the planned value is less than a lower limit value greater than 0%, a second correction is performed to increase the planned value.

2. The power control method according to claim 1, The first predetermined period for maintaining the first or second modification is shorter than the second predetermined period for maintaining the planned value.

3. The power control method according to claim 1, The first correction or the second correction will not be performed during the third predetermined period before the planned value switch or the fourth predetermined period after the planned value switch.

4. The power control method according to claim 3, The third or fourth predetermined period is the length of time or longer required from the time the planned value is switched until the output of the fuel cell device reaches the planned value.

5. The power control method according to claim 1, After the first or second modification is implemented, the first or second modification is not implemented during the fifth predetermined period.

6. The power control method according to claim 1, The distributed power system also includes a solar power generation device. When performing the control, the charging rate of the energy storage device after the predetermined time is estimated based on the difference between the actual value of the electricity demand of the electricity demander in the preceding sixth predetermined period and the sum of the actual value of the electricity generated by the solar power generation device and the planned value.

7. A power control device, which is a power control device for a distributed power system equipped with a fuel cell device and an energy storage device, comprising: A memory that stores the planned value of the electricity generated by the fuel cell device; and The controller, when supplying power to the power load of power consumers through the distributed power system, controls the generated power of the fuel cell device to the planned value of the fuel cell device's generated power. When the controller performs the control, if the charging rate of the energy storage device after a predetermined time based on the planned value is greater than an upper limit value less than 100%, the controller performs a first correction to reduce the planned value; or if the charging rate of the energy storage device after a predetermined time based on the planned value is less than a lower limit value greater than 0%, the controller performs a second correction to increase the planned value.

8. A power supply system, comprising: Fuel cell device; Energy storage devices; and The power control device according to claim 7.

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