Electrical energy distribution method and electrical energy distribution system

Abstract

An electric energy distribution method and an electric energy distribution system are provided that maintain the power supply stability or power supply reliability of a power grid during a contracted time period. [Solution] The electric energy distribution method includes receiving a contracted power supply amount and a contracted time period of a power distribution contract for an area, controlling a plurality of energy storage devices in the area based on the contracted power supply amount during the contracted time period to provide a plurality of stored electric energies to the power grid, and utilizing the plurality of stored electric energies to stabilize the power supply of the power grid.

Description

[Technical Field]

[0001] The present invention relates to a method and system for distributing electric energy. [Background technology]

[0002] Residential stored electrical energy can be provided to the power grid, thereby reducing the grid's power supply burden. Generally, the power that stored electrical energy can provide to the power grid is about several kilowatts (kW). For large-scale power grids, the stored electrical energy of a single user cannot maintain the power grid's supply stability or power supply reliability. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention relates to an electric energy distribution method and an electric energy distribution system for distributing a plurality of stored electric energy sources within an area. [Means for solving the problem]

[0004] In one embodiment of the present invention, an electric energy distribution method includes receiving a contracted power supply amount and a contracted time period of a power distribution contract for an area, controlling a plurality of energy storage devices in the area based on the contracted power supply amount during the contracted time period to provide a plurality of stored electric energies to a power grid, and utilizing the plurality of stored electric energies to stabilize the power supply of the power grid.

[0005] In one embodiment of the present invention, an electric energy distribution system includes a plurality of energy storage devices in an area and an electric energy management device. The electric energy management device is communicatively coupled to the plurality of energy storage devices. The electric energy management device receives a contracted power supply amount and a contracted time period of a power distribution contract for the area. The electric energy management device controls the plurality of energy storage devices in the area based on the contracted power supply amount during the contracted time period to provide a plurality of stored electric energy to a power grid. The plurality of stored electric energy is used to stabilize the power supply of the power grid. [Effects of the Invention]

[0006] Based on the above, during the contracted time slot, the electric energy distribution method and electric energy distribution system of the present invention can control the plurality of energy storage devices in the area based on the contracted power supply amount to provide the plurality of stored electric energy to the power grid. Therefore, the plurality of stored electric energy from the area is provided to the power grid during the contracted time slot. The present invention can provide sufficient stored electric energy to the power grid during the contracted time slot. In this way, the power supply stability or power supply reliability of the power grid can be maintained during the contracted time slot. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of an electrical energy distribution system according to one embodiment of the present invention; [Figure 2] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 3A] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 3B] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 3C] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 3D] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a district reserve distribution system according to one embodiment of the present invention; [Figure 5A] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 5B] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 6A] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 6B] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 7A] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 7B] 1 is a flowchart of a method for distributing electrical energy according to one embodiment of the present invention. [Figure 8] 1 is a schematic diagram of an energy storage device and an electricity meter according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] Some embodiments of the present invention will be described in detail below with reference to the drawings. When the same element reference numerals appear in different drawings, they are considered to be the same or similar elements. These embodiments are only a part of the present invention and do not disclose all embodiments of the present invention. More precisely, these embodiments are merely examples within the scope of the claims of the present invention.

[0009] Please refer to FIG. 1. FIG. 1 is a schematic diagram of an electric energy distribution system according to one embodiment of the present invention. In this embodiment, the electric energy distribution system 100 includes energy storage devices 110_1 to 110_n and an electric energy management device 120. The energy storage devices 110_1 to 110_n are located within a district. For example, the district may be at least one residential area, at least one building (e.g., a house, a school, or a factory), or at least a portion of an administrative district, but this embodiment is not limited thereto. In this embodiment, the energy storage devices 110_1 to 110_n can store power PGD from a power grid GD. For example, the energy storage device 110_1 is located in a home or facility within the district, and the home or facility uses power PGD and stores a portion of the power PGD in the energy storage device 110_1. For example, the home or facility can also store renewable energy PRC in the energy storage device 110_1. Renewable energy PRC can be energy generated by wind power, photovoltaic power (eg, solar energy), hydroelectric power, and the like.

[0010] In this embodiment, the electric energy management device 120 is communicatively coupled to the energy storage devices 110_1 to 110_n. The electric energy management device 120 receives a contracted power supply amount EDCP and a contracted time period EDCT of a power distribution contract EDC for a region. The power distribution contract EDC is established, for example, based on the intentions of users of the energy storage devices 110_1 to 110_n. During the contracted time period EDCT, the electric energy management device 120 controls the energy storage devices 110_1 to 110_n in the region based on the contracted power supply amount EDCP, thereby causing the energy storage devices 110_1 to 110_n to provide stored power PB1 to PBn to the power grid GD. In this embodiment, the stored power PB1 to PBn is used to stabilize the power supply of the power grid GD. For example, during the contracted time period EDCT, the stored power PB1 to PBn is aggregated at a node ND based on the contracted power supply amount EDCP to generate aggregated power. The aggregated power is provided from the node ND to the power grid GD. By way of example, the node ND may be a power distribution board (although the invention is not limited thereto).

[0011] It should be noted here that during the contract time slot EDCT, the electric energy distribution system 100 can provide stored power PB1-PBn by controlling the energy storage devices 110_1-110_n in the area based on the contract power supply amount EDCP. The electric energy distribution system 100 can provide aggregated power of the stored power PB1-PBn and use the aggregated power to supply power to the power grid GD. Therefore, the stored power PB1-PBn from the area is provided to the power grid GD during the contract time slot EDCT. The electric energy distribution system 100 can provide sufficient power (i.e., aggregated power) to the power grid GD during the contract time slot EDCT. In this way, the power supply stability or power supply reliability of the power grid GD can be maintained during the contract time slot EDCT.

[0012] For example, the energy storage device 110_1 is located in a residential area. The energy storage device 110_1 can provide stored power PB1 to the power grid GD. The power that the energy storage device 110_1 can provide to the power grid GD is 2 to 5 kilowatts (kW). The power of a single stored power PB1 is not enough to stabilize the power supply of the power grid GD.

[0013] In this embodiment, the contracted power supply capacity EDCP records the contracted power that the stored power PB1-PBn provides to the power grid GD during the contracted time period EDCT. For example, "n" is equal to "1000." The total contracted power of the stored power PB1-PBn can reach several thousand kW. Therefore, the aggregated power generated by the electric energy distribution system 100 is sufficient to stabilize the power supply of the power grid GD.

[0014] In this embodiment, the electric energy management device 120 can perform wireless communication with the energy storage devices 110_1 to 110_n through the cloud CLD. In some embodiments, the electric energy management device 120 can perform wired communication with at least one of the energy storage devices 110_1 to 110_n. In the present invention, the communication method between the electric energy management device 120 and the energy storage devices 110_1 to 110_n is not limited.

[0015] In this embodiment, the electric energy management device 120 can detect the amount of power usage of the users of the energy storage devices 110_1 to 110_n. When the amount of power usage reaches the upper limit of power usage, the electric energy management device 120 sends a warning message to the corresponding user's electronic device. The electronic device may be, for example, a portable electronic device (e.g., a smartphone, a smart watch, a tablet computer), a desktop computer, etc.

[0016] Furthermore, in this embodiment, if the power company cannot supply power to the power grid GD of the area, the electric energy distribution system 100 can supply power to the power grid GD. In this way, the electric energy distribution system 100 can realize the centralized island mode operation of the area.

[0017] In this embodiment, the electrical energy management device 120 may be implemented by, for example, a server or an electronic device or control circuit having computing capabilities, such as a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessor, digital signal processor (DSP), programmable controller, application specific integrated circuit (ASIC), programmable logic device (PLD), or other similar device or combination of these devices, capable of loading and executing a computer program.

[0018] Referring to FIGS. 1 and 2, FIG. 2 is a flowchart of an electric energy distribution method according to an embodiment of the present invention. In this embodiment, the electric energy distribution method S100 can be applied to an electric energy distribution system 100. The electric energy distribution method S100 includes steps S110 to S130. In step S110, the electric energy management device 120 receives a contracted power supply amount EDCP and a contracted time period EDCT of an electric power distribution contract EDC for a region. In step S120, the electric energy management device 120 controls the energy storage devices 110_1 to 110_n based on the contracted power supply amount EDCP during the contracted time period EDCT, and provides stored electric energy PB1 to PBn to the power grid GD. In step S130, the stored electric energy PB1 to PBn is used to stabilize the power supply of the power grid GD.

[0019] The details of the implementation of steps S110 and S120 will be explained below using examples.

[0020] 1 and 3A to 3D, FIGS. 3A to 3D are flowcharts of an electric energy distribution method according to an embodiment of the present invention. In this embodiment, the electric energy distribution method S200 includes steps S201 to S210. In step S201, the electric energy management device 120 receives the current time. In step S202, the electric energy management device 120 performs backup power distribution (also referred to as area backup power distribution) based on the current time. In this embodiment, backup power distribution can be performed throughout the day or at a specific time. In step S203, the electric energy management device 120 determines whether the energy storage devices 110_1 to 110_n in the area have been awarded based on the power distribution contract EDC for the area. If the energy storage devices 110_1 to 110_n have not been awarded, the electric energy management device 120 does not award power to the energy storage devices 110_1 to 110_n in step S204. On the other hand, if the energy storage devices 110_1 to 110_n have been awarded the bid, the electric energy management device 120 receives the contracted power supply amount EDCP and the contracted time period EDCT of the power distribution contract EDC for the area in step S205. The contracted time period EDCT may be a time period during which the energy storage devices 110_1 to 110_n provide the stored electric energy PB1 to PBn to the power grid GD. The contracted power supply amount EDCP may be the power during which the energy storage devices 110_1 to 110_n provide the stored electric energy PB1 to PBn to the power grid GD.

[0021] In step S206, the electric energy management device 120 determines whether the current time is within the contract time slot EDCT. If the current time is not within the contract time slot EDCT (for example, from 1:00 PM to 3:00 PM, but the present invention is not limited thereto), the electric energy management device 120 does not distribute power to the energy storage devices 110_1 to 110_n in step S204. On the other hand, if the current time is within the contract time slot EDCT, the electric energy management device 120 opens (for example, sets up) a connection between the stored electric energy PB1 to PBn and the cloud CLD in S207.

[0022] In step S208, the energy storage devices 110_1 to 110_n check whether they have received a power distribution instruction CMD1 to CMDn from the electric energy management device 120. The power distribution instructions CMD1 to CMDn are instructions generated based on the power distribution contract EDC. If they have not received the power distribution instruction CMD1 to CMDn from the electric energy management device 120, the energy storage devices 110_1 to 110_n perform auxiliary service standby for backup power distribution in step S209. If they have received the power distribution instruction CMD1 to CMDn from the electric energy management device 120, the energy storage devices 110_1 to 110_n perform real-time backup power distribution for backup power distribution based on the power distribution instruction CMD1 to CMDn in step S210.

[0023] In this embodiment, step S209 includes steps S2091 to S2097. In step S2091, the electrical energy management device 120 calculates a reserve power distribution capacity and a standby rate for the area. The reserve power distribution capacity may be the power or energy that can be distributed in the area. The standby rate may be the percentage of the energy storage devices 110_1 to 110_n that can participate in real-time reserve power distribution. For example, there are a total of 100 energy storage devices 110_1 to 110_n in the area. Assume that the state of charge (SOC) of the battery modules of 70 energy storage devices is sufficient to participate in the execution of real-time reserve power distribution. In this case, the standby rate is equal to 70%. For example, the electrical energy management device 120 calculates the reserve power distribution capacity every hour and the standby rate every minute.

[0024] In step S2092, the electric energy management device 120 determines whether the current time is within the contract time slot EDCT. If the current time is not within the contract time slot EDCT, the electric energy management device 120 disconnects the connection between the stored electric energy PB1 to PBn and the cloud CLD in step S2093, and ends the auxiliary service standby. On the other hand, if the current time is still within the contract time slot EDCT, the electric energy management device 120 returns to the operation of step S2091.

[0025] In step S2094, the electric energy management device 120 determines the standby rate. If the standby rate is equal to or greater than a predetermined value (e.g., 70%), the electric energy management device 120 returns to the operation of step S2091. On the other hand, if the standby rate is less than the predetermined value, the electric energy management device 120 charges the battery modules in the area with insufficient state of charge in step S2095. For example, the electric energy management device 120 controls the power grid GD and / or other energy storage devices to charge the battery modules with insufficient state of charge. In step S2096, the electric energy management device 120 determines the state of charge of the battery modules of the energy storage devices 110_1 to 110_n. If at least one of the state of charge of the battery modules of the energy storage devices 110_1 to 110_n is less than a threshold value (e.g., 90%), the electric energy management device 120 returns to the operation of step S2095. On the other hand, if the charge states of the battery modules of the energy storage devices 110_1 to 110_n are all equal to or greater than the threshold value, the energy storage devices 110_1 to 110_n stop charging in step S2097.

[0026] In this embodiment, step S210 includes steps S2101 to S210A. In step S2101, the electrical energy management device 120 receives information from a plurality of power meters corresponding to the energy storage devices 110_1 to 110_n. Thus, the electrical energy management device 120 can obtain the actual power supply amount history during the contract time slot EDCT. The electrical energy management device 120 calculates the electricity supply fee based on the actual power supply amount history corresponding to the stored electrical energy PB1 to PBn during the contract time slot EDCT. In step S2102, the electrical energy management device 120 obtains a response time point, a duration time slot, and a recovery time slot from the contract time slot EDCT. When the current time is equal to the response time point, the electrical energy management device 120 starts timing to generate a first timing value. In step S2103, the electrical energy management device 120 determines whether the first timing value has reached a first time threshold. If the first time count value has not yet reached the first time threshold, the energy storage devices 110_1 to 110_n continue to supply power to the power grid GD in step S2104. The electric energy management device 120 continues timing. Then, the process returns to step S2103. On the other hand, if the current time is not within the time period, the electric energy distribution method S200 proceeds to step S2105.

[0027] For example, the first time threshold is, for example, 70 minutes. In other words, the duration time period is, for example, 70 minutes. Upon receiving the power distribution command CMD1 to CMDn from the electric energy management device 120, the energy storage devices 110_1 to 110_n perform immediate backup power distribution in a step loop of steps S2103 and S2104, and continue until the first timer value reaches 70 minutes. In other words, the time length for which the energy storage devices 110_1 to 110_n perform immediate backup power distribution is 70 minutes.

[0028] In this embodiment, the first time threshold can be adjusted based on the electricity distribution contract EDC.

[0029] In step S2105, the electrical energy management device 120 measures time again to generate a second timed value and determines whether the second timed value reaches a second time threshold (e.g., 120 minutes). When the second timed value reaches the second time threshold, this indicates that the recovery time period has ended. The energy storage devices 110_1 to 110_n are charged in step S2106. When the second timed value has not yet reached the second time threshold, this indicates that the recovery time period has not yet ended. In step S2107, the electrical energy management device 120 determines whether the current time is in an off-peak time period.

[0030] If the current time is within the off-peak time slot, the energy storage devices 110_1 to 110_n are charged in step S2106. If the current time is not within the off-peak time slot, the energy storage devices 110_1 to 110_n are not charged in step S2108. Next, in step S2109, the electric energy management device 120 determines whether the recovery time slot has been exited. If the recovery time slot has not been exited, the energy storage devices 110_1 to 110_n maintain their current states. Next, the electric energy management device 120 returns to the operation of step S2107. If the recovery time slot has been exited, the electric energy management device 120 further determines in step S210A whether the current time is within a time slot for performing auxiliary service standby. If the current time is within a time slot for performing auxiliary service standby, the electric energy distribution method S200 proceeds to step S209. If the current time is not within a time slot for performing auxiliary service standby, the electric energy distribution method S200 ends.

[0031] In this embodiment, based on the power distribution contract EDC, the electric energy management device 120 transmits a power distribution instruction CMD1 to the energy storage device 110_1 and a power distribution instruction CMD2 to the energy storage device 110_2 in step S206. The energy storage device 110_1 provides stored electric energy PB1 in response to the power distribution instruction CMD1. The energy storage device 110_2 provides stored electric energy PB2 in response to the power distribution instruction CMD2, and so on.

[0032] 1, 4, 5A, and 5B, FIG. 4 is a schematic diagram of a district power reserve distribution system according to an embodiment of the present invention. In this embodiment, the district power reserve distribution system shown in FIG. 4 is a schematic diagram of a district power reserve distribution system provided by, for example, the Taiwan Power Company. FIGS. 5A and 5B are flowcharts of an electric energy distribution method according to an embodiment of the present invention. In this embodiment, the electric energy management device 120 sets a first frequency F1, a second frequency F2, and a third frequency F3. The first frequency F1 is lower than the second frequency F2. The second frequency F2 is lower than the third frequency F3. For example, the first frequency F1 is 59.88 Hz. The second frequency F2 is 59.98 Hz. The third frequency F3 is 60 Hz. Furthermore, the electric energy management device 120 sets a status flag. When the power grid frequency FGD of the power grid GD is lower than or equal to the first frequency F1, the electric energy management device 120 sets the status flag to a first value (e.g., logic "1"). When the power grid frequency FGD is greater than the second frequency F2 and less than or equal to the third frequency F3, the electrical energy management device 120 sets the status flag to a second value (eg, a logical "0").

[0033] Generally, when the power grid GD suddenly encounters an overload or a sudden drop in power supply, the power grid frequency FGD of the power grid GD will drop. Therefore, taking the energy storage device 110_1 as an example, in the process of area backup power distribution, the electric energy management device 120 can receive the power grid frequency FGD of the power grid GD through the energy storage device 110_1, and distribute the stored electric energy PB1 according to the change trend of the power grid frequency FGD.

[0034] The electric energy distribution method S300 includes steps S301 to S316. In step S301, the electric energy management device 120 compares the power grid frequency FGD with a first frequency F1. When the power grid frequency FGD is equal to or lower than the first frequency F1, the electric energy management device 120 sets a status flag to a first value in step S302, and provides the stored electric energy PB1 to the power grid GD based on the power distribution command CMD1 in step S303. Next, the electric energy management device 120 determines the status of the energy storage device 110_1 in step S304.

[0035] In step S301, when the power grid frequency FGD is higher than the first frequency F1, the electric energy management device 120 compares the power grid frequency FGD with the second frequency F2 in step S305. When the power grid frequency FGD is lower than the second frequency F2, this indicates that the power grid frequency FGD is higher than the first frequency F1 and lower than the second frequency F2. Next, the electric energy management device 120 determines a status flag in step S306. When the status flag has a first value, this indicates that the power grid frequency FGD is increasing. Therefore, the energy storage device 110_1 provides stored electric energy PB1 to the power grid GD based on the power distribution command CMD1 in step S307. Next, the electric energy management device 120 determines the state of charge of the battery module of the energy storage device 110_1 in step S304.

[0036] When the status flag has the second value, this indicates that the power grid frequency FGD is decreasing. Therefore, the energy storage device 110_1 stops providing the stored electric energy PB1 to the power grid GD in step S308. Next, the electric energy management device 120 determines the state of the energy storage device 110_1 in step S304.

[0037] Based on steps S305 to S308, if the power grid frequency FGD is higher than the first frequency F1 and lower than or equal to the second frequency F2, the electric energy management device 120 can determine the change trend of the power grid frequency FGD based on the status flag, and distribute the stored electric energy PB1 based on the change trend of the power grid frequency FGD.

[0038] In step S305, when the power grid frequency FGD is higher than the second frequency F2, the electric energy management device 120 compares the power grid frequency FGD with the third frequency F3 in step S309. When the power grid frequency FGD is lower than the third frequency F3, this indicates that the power grid frequency FGD is higher than the second frequency F2 and lower than the third frequency F3. Next, the electric energy management device 120 sets the status flag to a second value in step S310 and stops providing the stored electric energy PB1 to the power grid GD in step S311. Next, the electric energy management device 120 determines the status of the energy storage device 110_1 in step S304.

[0039] In step S309, when the power grid frequency FGD is higher than the third frequency F3, the energy storage device 110_1 charges its battery module using the power PGD of the power grid GD based on the power grid frequency FGD in step S312. In step S312, an increase in the power grid frequency FGD indicates that the load on the power grid GD is decreasing. At this time, the energy storage device 110_1 charges its battery module. The higher the power grid frequency FGD, the higher the charging power (i.e., the more negative the value). Next, the electrical energy management device 120 determines the state of the energy storage device 110_1 in step S304.

[0040] In this embodiment, when the power grid frequency FGD is higher than the third frequency F3, the charging power and the power grid frequency FGD have a linear correlation, but the present invention is not limited thereto. In some embodiments, when the power grid frequency FGD is higher than the third frequency F3, the charging power and the power grid frequency FGD have a non-linear correlation.

[0041] In step S304, the electric energy management device 120 determines whether the state of charge (SOC) of the battery module of the energy storage device 110_1 is equal to or greater than the maximum set state of charge (e.g., 98%, but the present invention is not limited thereto) and whether the energy storage device 110_1 is in a charging state. When the state of charge of the battery module of the energy storage device 110_1 is equal to or greater than the maximum set state of charge and the energy storage device 110_1 is in a charging state, the electric energy management device 120 controls the energy storage device 110_1 to stop charging the battery module in step S313. Then, the electric energy distribution method S300 ends or returns to step S301.

[0042] In step S304, when the state of charge of the battery module of the energy storage device 110_1 is lower than the maximum set state of charge or the energy storage device 110_1 is in a power supplying state, the electric energy management device 120 determines in step S314 whether the state of charge of the battery module of the energy storage device 110_1 is equal to or lower than a minimum set state of charge (e.g., 50%, but the present invention is not limited thereto) and whether the energy storage device 110_1 is in a power supplying state. When the state of charge of the battery module of the energy storage device 110_1 is equal to or lower than the minimum set state of charge and the energy storage device 110_1 is in a power supplying state, the electric energy management device 120 controls the energy storage device 110_1 to stop supplying power to the power grid GD in step S315. Then, the electric energy distribution method S300 ends or returns to step S301.

[0043] When the state of charge of the battery module of the energy storage device 110_1 is higher than the lowest preset state of charge, the electric energy management device 120 controls the energy storage device 110_1 to continue charging the battery module and / or supplying power to the power grid GD in step S316. Then, the electric energy distribution method S300 ends or returns to step S301.

[0044] As can be appreciated, the electrical energy distribution method S300 can also be applied to at least one of the energy storage devices 110_2 to 110_n.

[0045] 1, 6A, and 6B, FIGS. 6A and 6B are flowcharts of an electric energy distribution method according to an embodiment of the present invention. In this embodiment, the electric energy management device 120 receives electric power from the power grid GD through the energy storage device 110_1 and distributes stored electric energy PB1 based on fluctuations in the power of the renewable energy PRC using the electric energy distribution method S400. The power of the renewable energy PRC may fluctuate due to environmental fluctuations (e.g., fluctuations in sunlight intensity and wind power). Therefore, during the contract time period EDCT, the electric energy management device 120 stabilizes the power of the renewable energy PRC using the electric energy distribution method S400. In this embodiment, the renewable energy PRC can be obtained from the power grid GD.

[0046] The electric energy distribution method S400 includes steps S401 to S412. In step S401, the electric energy management device 120 sets the allowable fluctuation amount of the power of the renewable energy PRC. For example, a user sets the allowable fluctuation range of the power of the renewable energy PRC per minute to "10". Therefore, the electric energy management device 120 can divide the allowable fluctuation range by "100" to return the allowable fluctuation range to "10%". The electric energy management device 120 divides the allowable fluctuation range by "60" to generate the allowable fluctuation range per second. The electric energy management device 120 multiplies the average power value of the renewable energy PRC by the allowable fluctuation range per second to generate the allowable fluctuation amount of the power of the renewable energy PRC.

[0047] In step S402, the electric energy management device 120 sets a first threshold and a second threshold based on the power fluctuation allowance. The first threshold is greater than the second threshold. For example, the electric energy management device 120 can generate the first threshold by adding the fluctuation allowance to the power of the renewable energy PRC in the previous time (i.e., the previous second) and generate the second threshold by subtracting the fluctuation allowance from the power of the renewable energy PRC in the previous time. Therefore, the first threshold is expressed by formula (1). The second threshold is expressed by formula (2). JPEG2026035521000002.jpg14160

[0048] Pmax is the first threshold. Pmin is the second threshold. P_last is the power of the previous renewable energy PRC. P_rate is the fluctuation tolerance range.

[0049] After the first threshold and the second threshold are set, the electric energy management device 120 distributes the stored electric energy PB1 based on the comparison result between the current power of the renewable energy PRC and the first threshold and the second threshold.

[0050] Then, the electric energy management device 120 distributes the stored electric energy PB1 and the renewable energy PRC based on the comparison result between the current power of the renewable energy PRC and the first threshold value and the second threshold value.

[0051] In step S403, the electrical energy management device 120 determines whether the current power of the renewable energy PRC is greater than or equal to a first threshold. Taking the energy storage device 110_1 as an example, when the current power of the renewable energy PRC is greater than or equal to the first threshold, in step S404, the electrical energy management device 120 charges the battery module of the energy storage device 110_1 based on the power of the previous renewable energy PRC and the first threshold. For example, in step S404, the electrical energy management device 120 may subtract the first threshold from the power of the previous renewable energy PRC to generate a power distribution value (i.e., P_last-Pmax). The power value is a negative value, which indicates that the energy storage device 110_1 charges the battery module using the electrical energy of the renewable energy PRC. That is, when the current power of the renewable energy PRC is higher than the upper limit of the fluctuation allowance (i.e., the first threshold), the energy storage device 110_1 charges the battery module using the electrical energy of the renewable energy PRC instead of supplying power to the renewable energy PRC. Next, the electric energy management device 120 determines whether to supply power or charge based on the state of the energy storage device 110_1 in steps S405 and S409 to S412.

[0052] In step S403, when the current power of the renewable energy PRC is lower than the first threshold, the electrical energy management device 120 determines in step S406 whether the current power of the renewable energy PRC is equal to or lower than the second threshold. When the current power of the renewable energy PRC is equal to or lower than the second threshold, the energy storage device 110_1 supplies power to the power grid GD based on the power of the previous renewable energy PRC and the second threshold in step S407. For example, in step S407, the electrical energy management device 120 can subtract the second threshold from the power of the previous renewable energy PRC to generate a power distribution value (i.e., P_last-Pmin). The power value is a positive value, which indicates that the energy storage device 110_1 supplies power to the power grid GD using the stored electrical energy PB1. That is, when the current power of the renewable energy PRC is lower than the lower limit of the fluctuation allowance (i.e., the second threshold), the energy storage device 110_1 does not supply power to the renewable energy PRC. Next, the electric energy management device 120 determines whether to supply power or charge based on the state of the energy storage device 110_1 in steps S405 and S409 to S412.

[0053] In step S406, if the current power of the renewable energy PRC is higher than the second threshold, this indicates that the current power of the renewable energy PRC is within the fluctuation tolerance range. Therefore, the energy storage device 110_1 stops power supply and charging in step S408. Next, the electric energy management device 120 determines whether to supply power or charge based on the state of the energy storage device 110_1 in steps S405, S409 to S412.

[0054] In this embodiment, the operations in steps S405 and S409 to S412 are roughly the same as the operations in steps S304 and S313 to S316, and therefore will not be described again here.

[0055] 1, 7A and 7B, which are flowcharts of an electric energy distribution method according to one embodiment of the present invention. In this embodiment, the electric energy distribution method S500 is used to distribute electric energy during different electricity tariff periods (e.g., peak, off-peak or sub-peak periods) of the contract time period EDCT.

[0056] The electric energy distribution method S500 includes steps S510 to S570. The electric energy management device 120 determines the number of tariff periods in the electric power distribution contract EDC in step S510, and performs electric energy distribution based on the number of tariff periods in the electric power distribution contract EDC in step S520. In step S520, the electric energy management device 120 may perform electric energy distribution based on the number of tariff periods in the electric power distribution contract EDC, for example, using a SARIMA model. For example, the electric power distribution contract EDC has three tariff periods (e.g., peak period, off-peak period, and near-peak period). Therefore, the electric energy management device 120 may perform electric energy distribution based on a comparison result between the load of the electric power grid GD in the current tariff period and the power of the electric power grid GD in the current tariff period, and a comparison result between the load of the electric power grid GD in the next tariff period and the power of the electric power grid GD in the next tariff period.

[0057] For example, the electricity distribution contract EDC has two electricity tariff periods (e.g., peak and off-peak periods), and the electrical energy management device 120 can perform electrical energy distribution based on a comparison result between the load of the electricity grid GD during the current electricity tariff period and the power of the electricity grid GD during the current electricity tariff period.

[0058] For example, the electricity distribution contract EDC has a single electricity tariff time slot, and the electrical energy management device 120 can perform electrical energy distribution based on a comparison result between the load of the electricity grid GD during the current electricity tariff time slot and the power of the electricity grid GD during the current electricity tariff time slot.

[0059] Next, the electric energy management device 120 determines whether to supply power or charge based on the state of the energy storage device 110_1 in steps S530 to S570. In this embodiment, the operations in steps S530 to S570 are roughly similar to the operations in steps S304 and S313 to S316, and therefore will not be described again here.

[0060] Please refer to Figures 1 and 8. Figure 8 is a schematic diagram of an energy storage device and a power meter according to one embodiment of the present invention. In this embodiment, the energy storage device 210 includes battery modules 211_1 and 211_2 and a power regulator 212. The battery module 211_1 includes a battery unit BT1 and a battery management circuit BM1. The battery module 211_2 includes a battery unit BT2 and a battery management circuit BM2. The battery management circuit BM1 is coupled to the battery unit BT1 and the electrical energy management device 120. The battery management circuit BM2 is coupled to the battery unit BT2 and the electrical energy management device 120. The power regulator 212 is coupled to the battery management circuits 212_1 and 212_2, the power meter MTR, and the electrical energy management device 120.

[0061] In this embodiment, during the contract time period EDCT, the power regulator 212 receives a power distribution command CMD from the electric energy management device 120. The power regulator 212 controls the battery management circuits BM1 and BM2 based on the power distribution command CMD. Therefore, the battery management circuits BM1 and BM2 perform regional backup power distribution using the stored electric energy PB stored in the battery units BT1 and BT2 based on the power distribution command CMD.

[0062] For example, the battery modules 211_1, 211_2 and the power regulator 212 may be coupled in series with each other via the battery management circuits BM1, BM2. Accordingly, the battery units BT1, BT2 are also coupled in series with each other. Upon receiving the power distribution command CMD, the power regulator 212 communicates with the battery management circuit BM1 and communicates with the battery management circuit BM2 via the battery management circuit BM1. Accordingly, the battery management circuits BM1, BM2 perform zonal backup power distribution based on the power distribution command CMD.

[0063] In this embodiment, during the contract time period EDCT, the power meter MTR provides a history of actual power supply HP corresponding to the stored electrical energy PB. The electrical energy management device 120 calculates the electricity supply fee based on the history of actual power supply corresponding to the stored electrical energy PB during the contract time period EDCT. Furthermore, the power meter MTR provides a history of actual power usage corresponding to the power PGD of the power grid GD. The electrical energy management device 120 transmits a warning message based on the history of actual power usage.

[0064] For example, each of the battery units BT1, BT2 is implemented by at least one battery, which may be an aluminum-ion battery.

[0065] As described above, during the contracted time slot, the present invention can control a plurality of energy storage devices in a region to provide a plurality of stored electrical energies to the power grid based on the contracted power supply amount. Therefore, the plurality of stored electrical energies from the region are provided to the power grid during the contracted time slot. The present invention can provide sufficient stored electrical energy to the power grid during the contracted time slot. In this way, the power supply stability or power supply reliability of the power grid can be maintained during the contracted time slot. Furthermore, the present invention can realize an aggregated island mode operation of the region.

[0066] Although the present invention has been disclosed by the above examples, these do not limit the present invention, and a person having ordinary knowledge in the art may make some changes or modifications without departing from the spirit and scope of the present invention, and therefore the scope of protection of the present invention is defined by the following claims. [Industrial Applicability]

[0067] The present invention can provide sufficient stored electrical energy to the power grid during the contracted time period, thereby maintaining the power supply stability or power supply reliability of the power grid during the contracted time period. [Explanation of symbols]

[0068] 100: Electrical Energy Distribution Systems 110_1 to 110_n, 210: Energy storage device 120: Electrical energy management device 211_1, 211_2: Battery modules 212: Power regulator BM1, BM2: Battery management circuit BT1, BT2: Battery unit EDC: Electricity Distribution Contract EDCP: Contracted power supply EDCT: Contract time zone CMD, CMD1~CMDn: Power distribution instructions F1: First frequency F2: Second frequency F3: Third frequency FGD: Power grid frequency GD:Power grid HP: Actual power supply history MTR: Power meter PB, PB1 to PBn: stored electrical energy PGD:Electric power PRC: Renewable Energy S100, S200, S300, S400, S500: Electrical energy distribution methods S110-S130, S201-S210, S2091-S2097, S2101-S210A, S301-S316, S401-S412, S510-S570: Step

Claims

1. Receive the contracted power supply amount and contracted time period of the power distribution contract for the area; controlling a plurality of energy storage devices in the area based on the contracted power supply amount during the contracted time period to provide a plurality of stored electric energy to the power grid; and utilizing the plurality of stored electric energy sources to stabilize the power supply of the power grid.

2. The step of controlling the plurality of energy storage devices in the area based on the contracted power supply amount to provide the plurality of stored electric energies includes: transmitting a first power distribution instruction from the electrical energy management device to a first energy storage device of the plurality of energy storage devices and a second power distribution instruction from the electrical energy management device to a second energy storage device of the plurality of energy storage devices; the first energy storage device provides a first stored electrical energy among the plurality of stored electrical energies in response to the first power distribution instruction; 2. The method of claim 1, further comprising: the second energy storage device providing a second stored electrical energy of the plurality of stored electrical energies in response to the second electrical distribution instruction.

3. receiving a plurality of actual power supply amounts during the contract time period of a plurality of power meters corresponding to the plurality of energy storage devices; The method of claim 1 , further comprising: calculating an electricity rate based on the plurality of actual power supply histories corresponding to the plurality of stored electric energy sources during the contract time period.

4. The step of controlling the plurality of energy storage devices in the area based on the contracted power supply amount to provide the plurality of stored electric energies includes: receiving a power grid frequency of the power grid; The method of claim 1 , further comprising: distributing the plurality of stored electric energies based on a change trend of the power grid frequency.

5. The step of distributing the plurality of stored electric energies based on the change trend of the power grid frequency includes: setting a first frequency, a second frequency, and a third frequency, wherein the first frequency is lower than the second frequency, and the second frequency is lower than the third frequency; setting a status flag to a first value when the power grid frequency is less than or equal to the first frequency; setting the status flag to a second value when the power grid frequency is greater than the second frequency and less than or equal to the third frequency; 5. The method of claim 4, further comprising providing the plurality of stored electrical energy sources to the power grid in response to the first value of the status flag when the power grid frequency is greater than the first frequency and less than or equal to the second frequency.

6. The step of distributing the plurality of stored electric energies based on the change trend of the power grid frequency includes:

6. The method of claim 5, further comprising: ceasing to provide the plurality of stored electrical energy sources to the power grid in response to the second value of the status flag when the power grid frequency is greater than the first frequency and less than or equal to the second frequency.

7. The step of controlling the plurality of energy storage devices in the area based on the contracted power supply amount to provide the plurality of stored electric energies includes: receiving the renewable energy power; The method of claim 1 , further comprising: distributing the plurality of stored electric energies and the renewable energy based on fluctuations in the power.

8. The step of distributing the plurality of stored electric energies and the renewable energy based on the fluctuation of the electric power includes: setting a first threshold value and a second threshold value based on the fluctuation tolerance of the power rate, wherein the first threshold value is greater than the second threshold value; 8. The method of claim 7, further comprising: distributing the plurality of stored electric energies and the renewable energy based on a comparison result between a current power of the renewable energy and the first threshold value and the second threshold value.

9. The renewable energy is obtained from the power grid, and the step of distributing the plurality of stored electrical energies and the renewable energy based on a comparison result between the current power of the renewable energy and the first threshold value and the second threshold value includes: When the current power is equal to or greater than the first threshold, subtract the first threshold from the previous power of the renewable energy to generate a power distribution value, and charge the battery modules of the plurality of energy storage devices based on the power distribution value; 9. The method of claim 8, further comprising: when the current power is equal to or less than the second threshold, subtracting the second threshold from the previous power to generate the power distribution value; and supplying power to the power grid based on the power distribution value.

10. a plurality of energy storage devices within the area; an electric energy management device that is communicatively coupled to the plurality of energy storage devices, receives a contracted power supply amount and a contracted time period of a power distribution contract for the area, and controls the plurality of energy storage devices based on the contracted power supply amount during the contracted time period to provide a plurality of stored electric energies to a power grid; The plurality of stored electric energy sources are used to stabilize the power supply of the power grid.

11. the electrical energy management device transmits a first power distribution instruction to a first energy storage device of the plurality of energy storage devices and a second power distribution instruction to a second energy storage device of the plurality of energy storage devices; the first energy storage device provides a first stored electrical energy of the plurality of stored electrical energies in response to the first power distribution instruction; 11. The electrical energy distribution system of claim 10, wherein the second energy storage device provides a second stored electrical energy of the plurality of stored electrical energies in response to the second electrical distribution instruction.

12. The system further includes a plurality of power meters, wherein the electrical energy management device receives a plurality of actual power supply histories during the contract time period of the plurality of power meters corresponding to the plurality of energy storage devices; The electric energy distribution system according to claim 10 , wherein the electric energy management device calculates an electric bill based on the plurality of actual power supply histories corresponding to the plurality of stored electric energy during the contract time period.

13. 11. The electric energy distribution system of claim 10, wherein each of the plurality of energy storage devices receives a power grid frequency of the power grid, and distributes the plurality of stored electric energies based on a change trend of the power grid frequency.

14. the electrical energy management device setting a first frequency, a second frequency, and a third frequency, wherein the first frequency is lower than the second frequency, and the second frequency is lower than the third frequency; setting a status flag to a first value when the power grid frequency is less than or equal to the first frequency; setting the status flag to a second value when the power grid frequency is greater than the second frequency and less than or equal to the third frequency; 14. The electric energy distribution system of claim 13, configured to provide the plurality of stored electric energy sources to the electric power grid in response to the first value of the status flag when the electric power grid frequency is greater than the first frequency and less than or equal to the second frequency.

15. 15. The electric energy distribution system of claim 14, wherein the electric energy management device, in response to the second value of the status flag, stops providing the plurality of stored electric energy sources to the electric power grid when the electric power grid frequency is greater than the first frequency and less than or equal to the second frequency.

16. 11. The electric energy distribution system of claim 10, wherein the electric energy management device receives electric power from renewable energy sources and distributes the plurality of stored electric energies and the renewable energy sources based on fluctuations in the electric power.

17. 17. The electric energy distribution system of claim 16, wherein the electric energy management device sets a first threshold and a second threshold based on the allowable power fluctuation amount, wherein the first threshold is greater than the second threshold, and distributes the plurality of stored electric energies and the renewable energy based on a comparison result between the current power of the renewable energy and the first threshold and the second threshold.

18. the renewable energy is obtained from the power grid; When the current power is greater than or equal to the first threshold, the electrical energy management device subtracts the first threshold from the previous power of the renewable energy to generate a power distribution value, and charges the battery modules of the plurality of energy storage devices based on the power distribution value; 18. The electric energy distribution system of claim 17, wherein when the current power is less than or equal to the second threshold, the electric energy management device subtracts the second threshold from a previous power to generate the power distribution value, and supplies power to the electric power grid based on the power distribution value.

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