Power Management System

Abstract

To distribute an amount of power including both renewable energy-based power / non-renewable energy-based power to users in each power use section on demand, and enable management of the distribution record.SOLUTION: A controller 2 acquires information about a necessary amount of power including items of renewable energy-based power / non-renewable energy-based power with respect to each of racks A, B, C, and D. By totaling the necessary amount of power, a first total amount of power which is the total amount of power of the renewable energy-based power necessary as a data center 100, and a second total amount of power which is the total amount of power of the non-renewable energy-based power, are obtained. Power reception control is performed, that is, power of the data center 100 is procured with a target on receiving the first total amount of power and the second total amount of power. Moreover, the first total amount of power and the second total amount of power that are actually received are subjected to distribution processing, that is, distributed in accordance with the items desired by each of the racks A, B, C, and D.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power management system in a central facility that has equipment for receiving power collectively and distributing it to a plurality of independent power usage zones. [Background technology]

[0002] For example, there are data centers that provide services by accommodating users' equipment in independent usage sections, such as data centers that house computers, data communication equipment, etc. In such center facilities, instead of settling the amount of electricity used by each tenant as in a general office, the center facility receives electricity in bulk and distributes it to each usage section, and users pay a usage fee for the usage section that includes the amount of electricity used.

[0003] However, as the importance of managing greenhouse gas emissions is widely recognized and there is a growing momentum to clarify the types of electricity used, there is a trend for users of the above-mentioned usage areas to be required to manage the amount of electricity used from renewable and non-renewable energy sources.

[0004] Patent Document 1 discloses a system that allows users to select the power source for computer equipment installed in a data center from either the renewable energy category or the non-renewable energy category. However, Patent Document 1 does not mention the management of the amount of power used from renewable / non-renewable energy sources on a rack-by-rack basis in the data center. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6254288 Summary of the Invention [Problem to be solved by the invention]

[0006] As part of greenhouse gas emission management, there is a need to allocate the electricity received by a data center (center facility), which is a mixture of renewable and non-renewable energy sources, to users of each rack (power usage section) according to demand, and to manage the actual allocation results.The present invention aims to provide a power management system that enables such management. [Means for solving the problem]

[0007] An aspect of the present disclosure provides an electricity management system comprising: a center facility having a plurality of independent electricity usage zones, the center facility being equipped with electricity receiving equipment and electricity distribution equipment to the electricity usage zones; and a controller that performs electricity receiving control for the center facility and electricity distribution control for the electricity usage zones. The controller acquires information on the amount of electricity required for each of the electricity usage zones, including a breakdown of a first power derived from renewable energy and a second power derived from a non-renewable energy other than the first power, and by adding up the amount of electricity required for each of the electricity usage zones, calculates a first total amount of electricity, which is the sum of the amount of electricity of the first power, and a second total amount of electricity, which is the sum of the amount of electricity of the second power, required for the center facility; performs electricity receiving control to procure electricity for the center facility, with the receiving of the first total amount of electricity and the second total amount of electricity as target values; and performs an allocation process to allocate the procured first total amount of electricity and the second total amount of electricity to each of the electricity usage zones according to the breakdown.

[0008] According to this power management system, the required amount of power is calculated for each power usage zone, including a breakdown of the amount of power derived from renewable / non-renewable energy (breakdown of first power / second power), and a first total amount of power derived from renewable energy and a second total amount of power derived from non-renewable energy required for the center facility are calculated from each required amount of power. Power is received with these first and second total amounts of power as target values, and the received power is allocated to the power usage zones according to the breakdown. Therefore, it is possible to allocate the first power and / or second power according to the wishes of each power usage zone, and it is also possible to grasp the actual allocation results.

[0009] In the above-mentioned power management system, Center Facilities It is desirable that the power distribution system includes a storage battery connected to the power distribution facility, and the controller is capable of controlling charging and discharging of the storage battery, and when the first total amount of power is insufficient in the power procurement, causes the storage battery to discharge the amount of power that is insufficient, and when the first total amount of power is excessive, causes the storage battery to charge the amount of power that is insufficient.

[0010] According to this aspect, when there is a surplus or deficiency in the procurement of the first power, the storage battery can be used as a buffer to make up for the surplus or deficiency.

[0011] In the above-mentioned power management system, it is desirable that, as the allocation process, the controller acquires the actual power reception values ​​of the first total power amount and the second total power amount of the center facility through the power reception control in units of a predetermined time unit, and allocates the first total power amount and the second total power amount according to the breakdown of each of the power usage sections.

[0012] According to this aspect, the first total amount of power and the second total amount of power are allocated to each of the power consumption sections based on the actual power reception value as a result of the power reception control. Based on the result of this allocation, it is possible to accurately obtain the actual power usage values ​​of the first power and the second power for each of the power consumption sections.

[0013] In the above-mentioned power management system, if the allocation in a time frame, which is the calculation time unit of the amount of power, results in a power-deficient section in which the amount of power of the first power is insufficient, it is desirable that the controller allocates the amount of power of the first power to the power-deficient section in the allocation in the subsequent time frame after the time frame so as to make up for the shortfall in the amount of power of the first power.

[0014] According to this aspect, even if a power consumption section has a shortage in the actual value of one time block, the shortage can be made up by allocation in the subsequent time block, and therefore the total amount of power consumption of the first power can be matched to the desired value of the power consumption section.

[0015] In the above-mentioned power management system, if there is a specific power consumption section among the plurality of power consumption sections that desires to cover the entire amount of required power with the first power, the controller may be configured to preferentially allocate the first total amount of power to the specific power consumption section.

[0016] According to this aspect, it is possible to reliably meet the request of the specific power consumption section that the entire amount of required power be covered by the first power. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide an electricity management system that can distribute the amount of electricity received by a central facility in bulk, which is a mixture of electricity from renewable and non-renewable energy sources, according to the requests of each usage area and manage the distribution history. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing the relationship between power procurement and payment of power usage charges in a data center. [Figure 2] FIG. 2 is a block diagram showing the configuration of a power management system according to the present invention. [Figure 3] FIG. 3 is a block diagram showing the functional configuration of a controller included in the power management system. [Figure 4] FIG. 4 is a flowchart of the power reception control executed by the controller. [Figure 5] FIG. 5 is a schematic diagram for explaining the operation of the power reception control. [Figure 6] FIG. 6 is a flowchart of the allocation process executed by the controller. [Figure 7] FIG. 7 is a schematic diagram for explaining the operation of the distribution process. [Figure 8] FIG. 8 is a schematic diagram for explaining the adjustment process of allocating the excess or shortage of renewable energy-derived power to the next time frame. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of a power management system according to the present invention will be described in detail with reference to the drawings. The power management system of the present invention can be applied to a central facility having multiple independent power usage zones, power receiving equipment for collectively receiving power, and power distribution equipment for the power usage zones. In the following embodiments, a data center equipped with multiple racks for accommodating computers, data communication equipment, etc. will be exemplified as the central facility. The central facility may also be a multi-tenant building, warehouse, housing service facility, etc., rented with power usage fees included.

[0020] [Current power usage in data centers] FIG. 1 is a diagram showing the relationship between power procurement and payment of power usage charges in a conventional general data center. Center Facilities A data center operator 10, who is the owner of a data center building, has multiple racks 11, which are independent power usage sections, within a data center building. Each rack 11 is rented to a data center user, and the user installs computer-related equipment such as a server in the rack 11. In FIG. 1, racks rented to three users, X, Y, and Z, are shown as an example of the multiple racks 11.

[0021] A data center operator 10 collectively receives the power used within the data center and distributes the received power according to the contracted power of multiple racks 11. The data center operator 10 procures power from an external electricity retailer 12 and on-site power equipment 13 installed within the data center premises. The electricity retailer 12 is, for example, a local power company or a business company that owns power generation facilities. The on-site power equipment 13 is a facility that supplies power, such as a solar power generation facility or a storage battery, installed on the roof of a data center building or in an open space within the premises.

[0022] The data center operator 10 pays the electricity retailer 12 an electricity fee according to the amount of power used in a lump sum. Meanwhile, users X, Y, and Z pay the data center operator 10 a rack rental fee that includes an electricity fee corresponding to the amount of power used in each rack 11. In other words, the majority of data centers do not have a system in place where power usage is measured and managed individually for each rack 11, and users X, Y, and Z pay electricity fees according to that amount of power usage.

[0023] Under the revised Energy Conservation Act of 2022, users X, Y, and Z of rack 11 will also be treated as users of electricity supplied by other companies and will be subject to reporting of indirect greenhouse gas emissions under Scope 2. While such reporting has not yet become mandatory, an increase in the number of companies demonstrating a proactive stance toward global warming countermeasures is expected, leading to an increase in the number of reporters. For this reason, there is a trend toward requiring management of electricity usage from renewable and non-renewable energy sources on a rack 11-by-rack basis. The present invention has been made in light of this trend.

[0024] [Configuration of the power management system] 2 is a block diagram showing the configuration of a power management system 1 according to one embodiment of the present invention. The power management system 1 includes a data center 100 having the above-mentioned multiple racks 11 (power usage sections), a controller 2, and a data recording server 3. The data center 100 procures the required power from a power supplier 110, receives the power in bulk, and distributes the received power to the multiple racks 11 using a data center internal power distribution network 101 (power distribution equipment). A portion of the procured power is supplied to the data center 100 via an external power transmission network 111, which is a power transmission network outside the data center 100, and the remainder via a data center internal power transmission network 112, which is a power transmission network within the premises of the data center 100. The power receiving port of the data center 100 is a single unit that combines the power transmission networks 111 and 112.

[0025] FIG. 2 shows four racks A, B, C, and D as the multiple racks 11. Of course, the number of racks is not limited to four. To the right of each of the racks A, B, C, and D, a breakdown of the first electricity derived from renewable energy (hereinafter referred to as "renewable energy-derived electricity") and the second electricity derived from non-renewable energy other than renewable energy-derived electricity (hereinafter referred to as "non-renewable energy-derived electricity") for each rack is shown. Renewable energy-derived electricity is electricity generated using energy sources such as solar, wind, hydroelectric, biomass, and geothermal, as well as electricity that is temporarily stored and then discharged. Non-renewable energy-derived electricity is electricity generated using energy sources other than those listed above, such as thermal power that burns oil, coal, and LNG.

[0026] In Figure 2, the percentage marked "RE" indicates the degree of dependence on renewable energy-derived electricity. That is, rack A is a rack that desires 0% renewable energy-derived electricity RE, i.e., 100% non-renewable energy-derived electricity. Rack B is a rack that desires renewable energy-derived electricity RE = 50%, rack C is a rack that desires renewable energy-derived electricity RE = 100%, and rack D is a rack that desires renewable energy-derived electricity RE = 20%. The amount of electricity actually received by each of racks A, B, C, and D is measured by internal watt-hour meters L1, L2, L3, and L4 installed in the data center internal power distribution network 101.

[0027] The controller 2 controls power reception for the data center 100 and power distribution to racks A, B, C, and D. The data recording server 3 is a server that records data related to power usage in the data center 100, such as the measured values ​​per unit time frame of the internal watt-hour meters L1, L2, L3, and L4, and the results of the allocation of renewable energy-derived power, which will be described later. The controller 2 and the data recording server 3 will be explained further below.

[0028] The power suppliers 110 include grid power, off-site PPA, and self-dispatch, which are sources of power procured via an external power transmission network 111, and on-site PV and storage batteries, which are sources of power procured via a data center internal power transmission network 112. The external power transmission network 111 is a power transmission and distribution network facility owned by a general power transmission and distribution company. The data center internal power transmission network 112 is a power transmission network installed within the premises of the data center 100. Note that a data center does not necessarily use all of the grid power, off-site PPA, self-dispatch, on-site PV, and storage batteries as its power sources, and there are cases in which the data center does not receive power from sources other than grid power.

[0029] The amount of power received by the data center 100 from the grid power, off-site PPA, and self-dispatch via the external power transmission network 111 is metered collectively by a first external watt-hour meter M1. The amount of power received by the data center 100 from the on-site PV and storage batteries via the data center internal power transmission network 112 is metered by second and third external watt-hour meters M2 and M3, respectively. The amount of power received by the data center 100 as a whole is metered by a fourth external watt-hour meter M4.

[0030] The grid power of the power supplier 110 is mainly supplied from the power generation facilities and power grid owned by the local general electric utility. The data center 100 is an example of a consumer that adopts a partial supply method that does not rely 100% on this grid power. The data center 100 has also concluded a contract with the general electric utility to introduce a "renewable energy menu" in which part of the power supplied from the grid power is supplied by renewable energy-derived power. Therefore, the grid power can supply the data center 100 with both non-renewable energy-derived power, which is general power, and renewable energy-derived power based on the renewable energy menu.

[0031] The off-site PPA is a supplier of renewable energy-derived electricity, and supplies renewable energy-derived electricity generated by other companies' power generation facilities installed on the premises of other companies to the data center 100. Self-consignment is also a supplier of renewable energy-derived electricity, and supplies renewable energy-derived electricity generated by private solar power generation facilities installed outside the premises of the data center 100 to the data center 100 by borrowing an external power transmission network 111.

[0032] The on-site PV supplies renewable energy-derived power generated by its own solar power generation equipment or the like installed on the premises of the data center 100 to the data center internal power distribution network 101 through the data center internal power transmission network 112. The storage battery is charged with renewable energy-derived power from the on-site PV, and supplies the renewable energy-derived power to the data center internal power distribution network 101 through the data center internal power transmission network 112 by discharging the power continuously or intermittently.

[0033] Of the above-mentioned power suppliers 110, the off-site PPA, self-dispatch, and on-site PV supply the data center 100 with an amount of power according to a predetermined planned value. The amount of power supplied from the storage battery is controlled by the controller 2 based on the planned value. The amount of power supplied from the grid power is an amount of power that cannot be covered by the power supply from the off-site PPA, self-dispatch, on-site PV, and storage battery. In other words, the amount of power supplied from the off-site PPA, self-dispatch, on-site PV, and storage battery is essentially a fixed value, while the amount of power supplied from the grid power is a variable value that constantly follows the power demand of the data center 100.

[0034] [Controller function configuration] 3 is a block diagram showing the functional configuration of the controller 2 included in the power management system 1. The controller 2 is a processing unit including a microcomputer or the like, and operates to functionally include a power usage prediction unit 21, a user information storage unit 22, a power procurement amount calculation unit 23, a procurement control unit 24, a received power calculation unit 25, and an allocation adjustment unit 26 by reading a predetermined program.

[0035] The power consumption prediction unit 21 performs a process to acquire information on the amount of power required for each rack A, B, C, and D included in the data center 100. Electricity is often traded in units of calculation time, such as 30-minute time blocks, i.e., power metering and billing are performed. The power consumption prediction unit 21 calculates the average of the actual amount of power used in, for example, the past three time blocks and derives this calculated value as the predicted amount of power required for each rack A, B, C, and D in the next time block. Because the power consumption of data servers and other devices housed in racks A, B, C, and D is relatively stable, using the average of past actual values ​​as the predicted value is useful. Alternatively, the power consumption prediction unit 21 may derive an estimated value of the amount of power required for each rack A, B, C, and D in the next time block from a prediction formula obtained by learning from accumulated historical data on power consumption.

[0036] The user information storage unit 22 stores the supply ratio of renewable energy-derived electricity desired by each user, in addition to attribute information etc. of the users of racks A, B, C, and D. In the example of Fig. 2, as described above, the ratios of renewable energy-derived electricity RE to the total supply power of racks A, B, C, and D are 0%, 50%, 100%, and 20%, respectively. The power usage prediction unit 21 also uses the supply ratios to calculate the breakdown of renewable energy-derived electricity and non-renewable energy-derived electricity for the amount of power required predicted for the next time frame.

[0037] The power procurement amount calculation unit 23 performs a process of adding up the amounts of renewable energy-derived power and non-renewable energy-derived power required for each of the racks A, B, C, and D calculated by the power usage prediction unit 21. This addition process determines a first total amount of power, which is the total amount of renewable energy-derived power required for the entire data center 100 in the next time frame, and a second total amount of power, which is the total amount of non-renewable energy-derived power.

[0038] The procurement control unit 24 performs power receiving control to procure power for the data center 100, with the first total amount of power and the second total amount of power being set as target values. That is, the procurement control unit 24 compares the predicted first and second total amounts of power with the amount of power expected to be procured, and adjusts to compensate for any surplus or shortfall. As described above, the amounts of power from the off-site PPA, self-dispatching, and on-site PV are predetermined planned values, so the only thing that can be controlled is the amount of charge and discharge of the storage battery 4. If a shortage of the first total amount of power is expected, the procurement control unit 24 controls the charge and discharge controller 41 to discharge the amount of power that is insufficient from the storage battery 4 in addition to the normal amount of power discharge. On the other hand, if the first total amount of power is expected to be excessive, the procurement control unit 24 controls the charge and discharge controller 41 to charge the storage battery 4 with the excess amount of power.

[0039] The received power calculation unit 25 grasps the actual values ​​of the power usage of racks A, B, C, and D. The measurement values ​​of internal power meters L1, L2, L3, and L4 are recorded in the data recording server 3. The received power calculation unit 25 accesses the data recording server 3 and acquires the power usage of racks A, B, C, and D on a time frame basis. The received power calculation unit 25 also adds up the actual power reception values ​​for each of the racks to determine the first total power amount and the second total power amount for the entire data center 100.

[0040] The allocation adjustment unit 26 performs allocation control to allocate the first total amount of power and the second total amount of power actually received by the data center 100 to each of the racks A, B, C, and D in accordance with the supply ratio of renewable energy-derived power for each user recorded in the user information storage unit 22. In actual allocation, in the allocation in a certain time frame, there may be a rack (section using insufficient power) in which the allocation of the amount of renewable energy-derived power is insufficient. In this case, the allocation adjustment unit 26 allocates the amount of renewable energy-derived power to the rack in the allocation in the subsequent time frame after the time frame so as to make up for the shortage of the amount of renewable energy-derived power. The results of the allocation by the allocation adjustment unit 26 are recorded in the data recording server 3.

[0041] [Power receiving control] Next, an example of power receiving control for procuring power for the data center 100 executed by the controller 2 will be described. Fig. 4 is a flowchart of the power receiving control, and Fig. 5 is a schematic diagram for explaining the operation of the power receiving control. Fig. 4 shows control for procuring power in one time block, for example, in 30-minute units. Note that the time block may be in one-hour units, one-day units, etc.

[0042] When the process starts, the power consumption prediction unit 21 (FIG. 3) of the controller 2 performs a process to obtain predicted values ​​R1, R2, R3, and R4 of power consumption for the next time frame for each of the operating racks A, B, C, and D (FIG. 4 shows n units; the same applies below) in the data center 100 (step S1). As described above, the predicted value for each rack can be the average of the actual values ​​of the amount of power used in the past three time frames. Furthermore, the power consumption prediction unit 21 reads out renewable energy power supply ratio data rg1, rg2, rg3, and rg4 desired by the users of each of the racks A, B, C, and D from the user information storage unit 22 and associates them with the predicted values ​​R1, R2, R3, and R4 (step S2). FIG. 5(A) schematically illustrates the processes of steps S1 and S2.

[0043] Next, the power procurement amount calculation unit 23 calculates the amount of power required for the entire data center 100 for each of renewable energy-derived power and non-renewable energy-derived power (step S3). The total amount of renewable energy-derived power GRE (first total amount of power) can be calculated using the following formula (1), and the total amount of non-renewable energy-derived power NGE (second total amount of power) can be calculated using the following formula (2). Figure 5(B) schematically shows the processing of step S3.

number

[0044] Thereafter, the procurement control unit 24 provisionally calculates the amount of power procurement that can be secured at the current power procurement source 110 (step S4). The amount of power supplied from the off-site PPA is defined as EPPA, the amount of self-consignment power as Eself, the amount of power from the on-site PV as Esite, and the amount of power procured from the grid power as ED. As described above, EPPA, Eself, and Esite are power amounts set in advance as planned values, so the buffer elements are ED and the discharge amount Ebatt of the storage battery. Here, the amount of power that needs to be procured from the grid power is first found by calculating the value of ED that satisfies the following equation (3). GRE+NGE=EPPA+Eself+Esite+ED ···(3)

[0045] Furthermore, the procurement control unit 24 calculates the total amount of renewable energy-derived electricity GRc that has been secured at present (step S5). EPPA, Eself, and Esite are renewable energy-derived electricity, but the amount of electricity procured from the grid ED includes non-renewable energy-derived electricity. Therefore, ED obtained from equation (3) must be multiplied by the renewable energy-derived electricity ratio reco specified in the "renewable energy menu" contract. The total amount of renewable energy-derived electricity GRc can be calculated using the following equation (4). GRc=EPPA+Eself+Esite+ED·reco ···(4)

[0046] Next, the procurement control unit 24 evaluates the degree to which the renewable energy-derived electricity demand for racks A, B, C, and D in the next time frame calculated in step S3 is fulfilled by the secured amount of renewable energy-derived electricity calculated in step S5 (step S6). In this evaluation, the adjustment amount Bgr from the previous time frame is taken into consideration as a correction value. The adjustment amount Bgr is a correction term that adjusts the excess or shortage of renewable energy-derived electricity in the allocation for the next time frame. The procurement control unit 24 evaluates the degree of fulfillment using the following equation (5). Bgr is a positive value if the amount of renewable energy-derived electricity was insufficient in the previous time frame, and a negative value if the amount of renewable energy-derived electricity was excessive. GRc>GRE+Bgr (5)

[0047] If formula (5) is satisfied (YES in step S6), the procurement control unit 24 controls the charge / discharge controller 41 to charge the storage battery 4 with an excess amount of power equivalent to the difference between GRc and GRE+Bgr (step S7). On the other hand, if formula (5) is not satisfied (NO in step S6), the procurement control unit 24 controls the charge / discharge controller 41 to discharge the shortage amount of power equivalent to the difference from the storage battery 4 (step S8). The processing of steps S4 to S8 described above is schematically shown in FIG. 5(C).

[0048] [Distribution Processing] Next, an example of the allocation process of the actual value of received power to each rack, executed by the controller 2, will be described. Fig. 6 is a flowchart of the allocation process, and Fig. 7 is a schematic diagram for explaining the operation of the allocation process. This allocation process is a process for allocating the renewable energy-derived power portion and non-renewable energy-derived power portion of received power to each of racks A, B, C, and D after power procurement for one time frame has been completed.

[0049] When the process starts, the received power calculation unit 25 (FIG. 3) of the controller 2 acquires the amount of power usage for each of the racks A, B, C, and D in the previous time frame (step S11). This amount of power usage can be acquired by reading the actual measurement values ​​of the internal watt-hour meters L1, L2, L3, and L4 from the data recording server 3. Furthermore, the received power calculation unit 25 reads the renewable energy-derived power supply ratio data rg1, rg2, rg3, and rg4 desired by the users of the racks A, B, C, and D from the user information storage unit 22, and associates them with the actual power usage values ​​L1, L2, L3, and L4 (step S12).

[0050] Next, the received power calculation unit 25 calculates the amount of received power for the entire data center 100 in the next time frame (step S13). The total amount of received power for the data center 100 can be obtained from the measurement value of the external watt-hour meter M4. However, since it is necessary to determine the breakdown of electricity derived from renewable energy, the received power calculation unit 25 obtains from the data recording server 3 the measurement value of the external watt-hour meter M1 installed in the external power transmission network 111 and the measurement values ​​of the external watt-hour meters M2 and M3 installed in the data center internal power transmission network 112.

[0051] Furthermore, the received power calculation unit 25 calculates how much of the total received power is included in the amount of renewable energy-derived power and how much is non-renewable energy-derived power. The amount of received power EPPA from the off-site PPA and the amount of received power Eself from self-consignment are determined as the actual received values ​​of renewable energy-derived power by applying the predetermined planned values ​​as is. The amount of received power from the on-site PV and the amount of received power from the storage battery are determined as the measured values ​​of external energy meters M2 and M3, respectively. The amount of received power ED from the grid power is determined by excluding EPPA and Eself from the measured values ​​of external energy meter M1. In other words, the amount of received power ED can be calculated using the following equation (6): ED=M1-(EPPA+Eself) (6)

[0052] In equation (6), ED is the sum of renewable energy-derived power and non-renewable energy-derived power. The amount of renewable energy-derived power is calculated by multiplying ED by the renewable energy-derived power ratio (reco) specified in the "Renewable Energy Menu" contract. Therefore, the amount of non-renewable energy-derived power, EDnon, i.e., the general power portion of grid power, can be calculated using equation (7) below. Figure 7 shows the state where the breakdown of renewable energy-derived power and non-renewable energy-derived power of the total amount of power received by the data center 100 has been obtained as <power reception record> using the above-mentioned processing. EDnon=ED·(1-reco) ···(7)

[0053] Thereafter, the allocation adjustment unit 26 performs a process of allocating the renewable energy-derived power portion and non-renewable energy-derived power portion of the total amount of received power to each of the racks A, B, C, and D. FIG. 7 illustrates this allocation. First, the total amount of received power is allocated to racks with 100% needs, that is, racks that are 100% dependent on renewable energy-derived power (RE 100%) or racks that are 100% dependent on non-renewable energy-derived power (RE 0%) (step S14). In this embodiment, rack C (specific power usage section) is a 100% RE rack that desires to cover all of its required power with renewable energy-derived power. The renewable energy-derived power portion of the total amount of received power is preferentially allocated to rack C, ensuring that the request of the user of rack C is met. Rack A is a 0% RE rack that desires to cover all of its required power with non-renewable energy-derived power. Rack A is given priority for allocation of the non-renewable energy portion of the total amount of received power.

[0054] Next, the allocation adjustment unit 26 allocates the remaining amount of received power from renewable energy-derived electricity and the amount of received power from non-renewable energy-derived electricity to racks having needs other than 100% (step S15). In this embodiment, racks B and D are racks having needs other than 100%. Rack B is a rack that relies 50% on renewable energy-derived electricity (RE50%), and rack D is a rack that relies 20% on renewable energy-derived electricity (RE20%). The remaining amount of received power is allocated to racks B and D. Note that if there is a surplus or shortage in the amount of renewable energy-derived electricity or non-renewable energy-derived electricity, the surplus or shortage is allocated proportionally to racks B and D.

[0055] Here, the total amount of renewable energy-derived electricity EgA to be allocated is a value that includes the adjustment amount Bgr of renewable energy-derived electricity in the previous time frame. The adjustment amount Bgr is an adjustment amount of electricity to be added or subtracted to carry over the excess or shortage of renewable energy-derived electricity in the allocation of the previous time frame to the following time frame. This takes into account the possibility that the supply of renewable energy-derived electricity may be disrupted due to bad weather or equipment trouble, and that it may not be possible to balance the books in one time frame. In other words, the EgA to be allocated in the current time frame is calculated using the following formula (8). EgA=EPPA+Eself+M2+M3+ED·reco±Bgr···(8)

[0056] FIG. 8 is a schematic diagram illustrating the adjustment process for allocating the surplus or shortage of renewable energy-derived power to the next time frame. An example of adjustment for rack B (RE 50%) is shown here. If there is no surplus or shortage of renewable energy-derived power, the amount of power actually used by rack B, L2, is allocated so that, for example, in time frames T1 and T2, renewable energy-derived power RE = 50% and non-renewable energy-derived power = 50%. However, suppose that, for some reason, renewable energy-derived power RE is insufficient by -W1, as in time frame T3. In this case, in the next time frame T4, renewable energy-derived power RE is allocated so that RE = 50% + W1. Furthermore, if, as in time frame T6, renewable energy-derived power RE can be allocated in excess by +W2, in the next time frame T7, renewable energy-derived power RE is allocated so that RE = 50% - W2.

[0057] The accumulated adjustment amount Bgr may be adjusted entirely using the EgA of one time block, or may be adjusted by dividing it proportionately among the EgA of subsequent time blocks. Furthermore, a process may be performed to offset the shortfall in the amount of renewable energy-derived electricity using a certificate, as shown in Figure 2. The certificate is a paid certificate that replaces the amount of electricity procured from general grid power with electricity procured from renewable energy. The certificate may also be used to cover part of the renewable energy-derived electricity when there is no shortfall in the amount of renewable energy-derived electricity.

[0058] Thereafter, the distribution adjustment unit 26 records the results of the distribution of power to each of the racks A, B, C, and D in the data recording server 3 (step S16). The distribution of renewable energy-derived power to each of the racks A, B, C, and D in one time frame is recorded as Dg1, Dg2, Dg3, and Dg4, and the distribution of non-renewable energy-derived power is recorded as L1-Dg1, L2-Dg2, L3-Dg3, and L4-Dg4, associated with the identification code of each rack. By accumulating the power amounts for one time frame, the actual power usage for each rack for one day or one month can be determined.

[0059] Finally, the allocation adjustment unit 26 calculates the excess or shortage that occurred in the allocation of the amount of power, and carries this over to the allocation of the next time frame as the adjustment amount Bgr (step S17). The adjustment amount Bgr can be calculated using the following equation (9).

number

[0060] According to the power management system 1 according to the present embodiment described above, the required power amount, including the breakdown of renewable energy-derived power and non-renewable energy-derived power, is calculated for each of racks A, B, C, and D in the data center 100, which is a power consumption section. Furthermore, the total amount of renewable energy-derived power and the total amount of non-renewable energy-derived power required for the data center 100 are calculated from the required power amounts for each of racks A, B, C, and D. Power is received with this total amount of power as a target value, and the received power amount is allocated according to the ratio of renewable energy-derived power to non-renewable energy-derived power desired by racks A, B, C, and D. Therefore, the amount of renewable energy-derived power and non-renewable energy-derived power desired by each of racks A, B, C, and D can be allocated, and the actual allocation results can be tracked. This allows users of racks A, B, C, and D to respond to Scope 2 reports. [Explanation of symbols]

[0061] 1. Power Management System 10. A, B, C, D racks (power usage areas) 100 Data Centers (Center Facilities) 101 Data center internal power distribution network (power distribution equipment) 110 Power Suppliers 2 Controller 21 Power consumption prediction section 22 User information storage unit 23 Power Procurement Calculation Department 24 Procurement Control Department 25 Received power calculation unit 26 Allocation Adjustment Department 3 Data recording server 4. Storage battery

Claims

1. a center facility having a plurality of independent power usage zones, the center facility including power receiving equipment and power distribution equipment for the power usage zones; a controller that controls power reception for the center facility and power distribution to the power consumption zones, The controller For each of the power consumption sections, information on the amount of required power is acquired, including a breakdown of first power derived from renewable energy and second power derived from non-renewable energy other than the first power; calculating a first total amount of power, which is a sum of the amounts of power of the first power required for the center facility, and a second total amount of power, which is a sum of the amounts of power of the second power required for the center facility, by adding up the amounts of power required for each of the power consumption sections; performing power receiving control for procuring power for the center facility, with the first total amount of power and the second total amount of power being set as target values; an electricity management system that performs an allocation process to allocate the procured first total amount of electricity and the procured second total amount of electricity to each of the electricity usage sections according to the breakdown;

2. The power management system according to claim 1, the center facility includes a storage battery connected to the power distribution equipment, The controller is capable of controlling the charging and discharging of the storage battery, and when the first total amount of power is insufficient in the power procurement, causes the storage battery to discharge the amount of power that is insufficient, and when the first total amount of power is excessive, causes the storage battery to charge the amount of power that is insufficient.

3. 3. The power management system according to claim 1, As part of the allocation process, the controller acquires the actual power reception values ​​of the first total power amount and the second total power amount of the center facility through the power reception control in units of a predetermined time unit, and allocates the first total power amount and the second total power amount according to the breakdown of each of the power usage sections.

4. The power management system according to claim 3, When a power shortage section occurs in which the amount of first power is insufficient as a result of the allocation in a time frame that is a calculation time unit of the amount of power, The controller allocates the amount of power of the first power to the section using the power deficit so as to make up for the shortfall in the amount of power of the first power in the allocation in the subsequent time frame after the time frame.

5. The power management system according to claim 3, If there is a specific power consumption section among the plurality of power consumption sections that desires to cover the entire amount of required power with the first power, The controller allocates the first total amount of power to the specific power consumption section with priority.

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