Balance control generator

Abstract

A control unit for controlling a power supply device configured for power supply between an energy storage and a power grid supplying power to a connection point, the power grid comprising a plurality of power conductors, the control unit configured to receive first data indicative of power exchanged at the connection point, the first data is used to determine that a difference in power exchanged between a pair of power conductors of the plurality of power conductors is above a power threshold, and a control signal indicative of a power setpoint for the energy storage is provided to the power source.

Description

Technical Field

[0001] This disclosure relates to a control unit and method for controlling an electric power supply device configured for power supply between an energy storage device and a power grid supplying power to a connection point. Background Technology

[0002] When multiple generators and loads are connected to the grid in a house, or when generators generate electricity asymmetrically for local optimization in a house connected to the grid, the power fed back to the grid cannot exceed a certain threshold. Furthermore, grid operators can set power feed-in limits at grid connection points.

[0003] Implementing these requirements in electric vehicles leads to a poor customer experience because the generator may not be allowed to discharge to its maximum discharge power. Summary of the Invention

[0004] According to an embodiment, a control unit is provided for controlling a power supply device configured for power exchange between an energy storage device and a power grid supplying power to a connection point, the power grid including a plurality of power conductors. The control unit is configured to receive first data indicating the power exchanged at the connection point, use the first data to determine that the difference in power exchanged between a pair of power conductors among the plurality of power conductors is above a power threshold, and provide a control signal to the power source indicating a power setpoint for the energy storage device.

[0005] This allows the amount of power difference or power asymmetry between two conductors to be kept below a permissible maximum value (power threshold) by using an energy storage device. A control signal indicates the new setpoint for the energy storage device. The updated setpoint will instruct the energy storage device to draw or supply power from one or more conductors to ensure that the asymmetry of current between multiple conductors at the house's grid connection point is within permissible limits set by the grid's service provider.

[0006] When electrical supply equipment is charging or discharging (e.g., at full power) in a building, and the building has other generating units or loads, the maximum permissible asymmetry limit between conductors can be violated. By implementing the described balance check function, the electrical supply equipment can act as an external balancing device and lower the charging or discharging setpoint to protect existing facilities.

[0007] According to an embodiment, a method for controlling a power supply device configured for power supply between an energy storage device and a power grid supplying power to a connection point, the power grid including a plurality of power conductors, is provided. The method includes receiving first data indicating the power exchanged at the connection point, using the first data to determine that the difference in power exchanged between a pair of power conductors among the plurality of power conductors is above a power threshold, and providing a control signal to the power source indicating a power setpoint for the energy storage device.

[0008] Control signals can instruct an energy storage device to supply power to or draw power from at least one of the multiple power conductors in the power grid.

[0009] This allows the energy storage device to compensate for the unacceptable electrical difference between conductors by lowering the charging or discharging power setpoint.

[0010] The power setpoint indicated by the control signal can be based on the maximum difference among the differences in the power exchanged between each pair of power conductors in a plurality of power conductors.

[0011] In this way, if there are several unacceptable differences between conductors, the maximum difference will be used to determine how much power the energy storage device should charge or discharge in order to protect the power grid.

[0012] A power grid can include three electrical conductors. This is the typical number of conductors used in residential power grids. However, a power grid can include any other number of conductors.

[0013] The first data can be received from the measuring device connected to the connection point.

[0014] A control unit for controlling a power supply device configured for power supply between an energy storage device and a power grid supplying power to a connection point, the control unit being configured to receive first data indicating the amount of electricity supplied from the energy storage device to the power grid, use the first data to determine that the amount of electricity supplied from the energy storage device to the power grid exceeds the maximum permissible power, and provide the power supply device with a control signal indicating that the energy storage device should reduce the amount of electricity supplied from the energy storage device to the power grid and should supply another amount of electricity from the energy storage device to another energy storage device.

[0015] This allows the control unit to detect if an energy storage device wants to supply more power to the grid than the maximum allowed, and a portion of that power will be sent to another energy storage device, possibly in the same house where the vehicle is being charged. The control unit can be located in the power supply equipment at the vehicle's location or in an external power supply system. The power grid may include one or any other number of conductors.

[0016] A method for controlling a power supply device configured for power supply between an energy storage device and a power grid supplying power to a junction point, the method comprising: receiving first data indicating the amount of electricity supplied from the energy storage device to the power grid; using the first data to determine that the amount of electricity supplied from the energy storage device to the power grid exceeds a maximum permissible power; and providing a control signal to the power supply device, the control signal instructing the energy storage device to reduce the amount of electricity supplied from the energy storage device to the power grid and to supply another amount of electricity from the energy storage device to another energy storage device.

[0017] Another energy storage device can be installed at the house, and the power grid is configured to supply electricity to the house.

[0018] Another electrical force supplied from one energy storage unit to another can be based on a reduction in the amount of electricity supplied from the energy storage unit to the grid.

[0019] The additional electrical force supplied from one energy storage unit to another is equal to the reduction in the amount of electricity supplied from one energy storage unit to the grid. In this way, electricity is used efficiently. This allows the energy storage unit to be used at its full capacity.

[0020] The maximum allowable power output of a power grid can be set by the service provider that manages the power grid.

[0021] Energy storage devices can be installed in electric vehicles.

[0022] According to another embodiment, a power supply device is provided that includes any of the control units described above.

[0023] According to another embodiment, an electric vehicle is provided that includes any of the control units described above.

[0024] In this way, energy storage devices will be able to help the power grid restore asymmetries between lines or connectors to the required limits.

[0025] Those skilled in the art will understand that the above features can be combined in any way that is considered useful. Attached Figure Description

[0026] The present disclosure will now be described in more detail with reference to the accompanying drawings, which illustrate embodiments of the present disclosure:

[0027] Figure 1A-I and Figure 1A-II This is a schematic diagram of a system for charging and / or discharging energy storage according to at least one example of the present disclosure.

[0028] Figure 1B This is a schematic diagram of a system for charging and / or discharging an energy storage device, according to at least one example of this disclosure.

[0029] Figure 2A This is a flowchart of a method for controlling an energy storage device according to at least one example of this disclosure.

[0030] Figure 2B This is a flowchart of a method for controlling an energy storage device according to at least one example of this disclosure.

[0031] Figure 3 This is a schematic diagram of a system for a power supply device including a control unit, based on an example of this disclosure.

[0032] Figure 4 Examples are shown to provide examples according to this disclosure. Figure 1A-I and Figure 1A-II A table showing examples of the system. Detailed Implementation

[0033] Embodiments of this disclosure will now be described herein with reference to the accompanying drawings. However, the embodiments of this disclosure are not limited to the specific embodiments and should be construed as including all modifications, alterations, equivalent apparatus and methods, and / or alternative embodiments of this disclosure.

[0034] As used herein, terms such as “first” and “second” may modify various elements regardless of the order and / or importance of the corresponding elements, and do not limit the corresponding elements. These terms may be used for the purpose of distinguishing one element from another. For example, without departing from the scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0035] The terminology used in describing the various embodiments of this disclosure is for the purpose of describing particular embodiments and is not intended to limit this disclosure. As used herein, singular forms are intended to include plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same or similar meaning as in the context of the related art and should not be interpreted as having an ideal or exaggerated meaning unless they are explicitly defined herein. As appropriate, even terms defined in this disclosure should not be construed as excluding embodiments of this disclosure.

[0036] As used herein, the term "vehicle" refers to an object used for the transport of people or goods. Examples of vehicles include motor vehicles, automobiles, trucks, or buses. The term "vehicle" also includes electric vehicles (EVs) powered by an electric motor that draws current from an onboard energy storage device, such as a battery, which can be recharged from an external source, such as a residential or public power service or an onboard fuel-powered generator. An EV can be two or more wheeled vehicles manufactured for primary use on public streets and roads. EVs can be referred to as electric vehicles, electric motor vehicles, electric road vehicles (ERVs), plug-in vehicles (PVs), plug-in vehicles (xEVs), etc., and xEVs can be classified as plug-in fully electric vehicles (BEVs), battery electric vehicles, plug-in electric vehicles (PEVs), hybrid electric vehicles (HEVs), hybrid plug-in electric vehicles (HPEVs), plug-in hybrid electric vehicles (PHEVs), etc.

[0037] Figure 1A-I and Figure 1A-II This is a schematic diagram of a system 100 for charging an energy storage device 106, according to at least one example of the present disclosure.

[0038] Figure 1A-I The system 100 shows an electric vehicle 112 including an energy storage device 106. Figure 1A-I System 100 also shows a power supply device 104 connected to the power grid 108 via a connection point 110 of house 124. Power grid 108 is a three-phase distribution network for sending electrical energy to connection point 110. The power grid includes three conductors or phase current lines 150a, 150b, and 150c, each with a different phase.

[0039] House 124 includes power supply equipment 104 and other loads and / or generators 122 (such as, for example, photovoltaic systems) belonging to house 124, such that power exchange in both directions between power grid 108 and house 124 can occur by connecting power grid 108 to power supply equipment 104 and other loads and / or generators 122 via power connection 160. Power connection 160 includes first, second, and third conductors or current lines 160a, 160b, and 160c, each with different phases, such that a first phase of the first current line 160a of power connection 160 corresponds to a first phase of the first power connector 150a of power grid 150, a second phase of the second current line 160a of power connection 160 corresponds to a second phase of the second power connector 150a of power grid 150, and a third phase of the third current line 160a of power connection 160 corresponds to a third phase of the third power connector 150a of power grid 150. The power supply device 104 is connected to the electric vehicle 112 via a second connection line 120. The second connection line 120 also includes first, second, and third conductors or current lines 120a, 120b, and 120c, each with a different phase, such that the first phase of the first current line 120a of the power cable 120 corresponds to the first phase of the first power connector 150a of the power grid 150, the second phase of the second current line 120a of the power cable 120 corresponds to the second phase of the second power connector 150a of the power grid 150, and the third phase of the third current line 120a of the power cable 120 corresponds to the third phase of the third power connector 150a of the power grid 150.

[0040] Energy storage device 106 can be connected to and disconnected from power supply device 104 via power cable 120. In this way, when energy storage device 106 is connected to power supply device 104, energy storage device 106 can supply power to grid 108 and consume power from grid 108.

[0041] The electric vehicle 112 may include a DC-to-AC (and AC-to-DC) converter, for example, as part of the power board measurement circuit 130. In this way, the power supply device 104 can act as a switch and allow power to pass through it in both directions.

[0042] The power supply device 104 includes a control unit 102. However, the control unit 102 may also be located at the electric vehicle 112. The control unit 102 is configured to receive first data indicating the power exchanged at the connection point 110. The control unit 102 is also configured to use the first data to determine that the difference in power exchanged between a pair of power conductors among the plurality of power conductors 150 is above a power threshold. If the power exchanged between a pair of power conductors is above the power threshold, the control unit 102 is configured to provide the power supply device 104 with a control signal indicating the power setpoint of the energy storage device 106.

[0043] For example, the control unit 102 can be connected to the energy storage unit 106 via the communication line 226, so that the energy storage unit 106 can receive control signals via the communication line 226.

[0044] First data indicating the exchanged power at connection point 110 can be obtained based on power measurements of the exchanged power taken at multiple connectors 150 in the power grid.

[0045] As described above, when the difference in current or power amplitude between at least two of the current lines 150a, 150b and 150c is greater than the power threshold, a control signal indicating the power setpoint of the energy storage device is provided to the power source.

[0046] The control signal instructs the energy storage device to supply power to or draw power from at least one of the multiple power conductors of the power grid.

[0047] For example, the power setpoint indicated by the control signal can be based on the maximum difference among the differences in the power exchanged between each pair of power conductors in a plurality of power conductors.

[0048] Based on this power setpoint, the energy storage device 106 can begin charging from one or more of the multiple power connectors 150 of the power grid 108, or begin discharging to one or more of the multiple power connectors 150 of the power grid 108.

[0049] In this manner, the control unit 102 determines the power setpoint of the energy storage unit 106 of the electric vehicle 112 based on the first data. The power supply device 104 can communicate the power setpoint to the electric vehicle 112 via the communication line 226 using communication protocols such as ISO 15118-2, ISO 15118-20, IEC 61851, or DIN 70121. However, any other communication standard can be used for possible / permitted operations such as wireless, Bluetooth, etc.

[0050] Furthermore, when the difference in current or power amplitude between current lines 150a, 150b, and 150c is less than the power threshold, the control unit 102 can provide the power supply 104 with a control signal indicating an updated power setpoint for the energy storage unit 106.

[0051] Now refer to Figure 4 explain Figure 1A-I and Figure 1A-II An example of how the system can work.

[0052] exist Figure 4 In this table, the meaning of each column is indicated by the first row. The second row identifies different phase lines. The third row indicates examples of energy storage 106 charging power (i.e., draining power from the grid 108) for the next six rows following the third row. The tenth row indicates examples of energy storage 106 discharging power (i.e., supplying power to the grid 108) for the next six rows following the tenth row.

[0053] Figure 4 The first three columns indicate the current setpoint of the energy storage 106, the next three columns after the first column indicate the power exchanged at connection point 114, the seventh column indicates the maximum asymmetry calculated based on the values ​​of the previous six columns, the eighth column indicates the permissible limit (power threshold), the ninth column indicates which power reduction is required based on the permissible limit and the maximum asymmetry, and the last three columns indicate the updated setpoint of the energy storage 106 calculated based on the ninth column.

[0054] For example, the fourth row indicates (the first three columns of this row) that energy storage 106 draws 16 volts from the first power connector 150a (L1) of the power grid 108, 16 volts from the second power connector 150b (L2) of the power grid 108, and 16 volts from the third power connector 150c (L3) of the power grid 108. The fourth to sixth columns of the fourth row indicate the exchanged power at connection point 110: 5 volts at the first power connector 150a (L1) of the power grid 108, 6 volts at the second power connector 150b (L2) of the power grid 108, and 7 volts at the third power connector 150c (L3) of the power grid 108. The seventh column of the fourth row indicates that the maximum difference in power exchanged between the different power connectors 150a, 150b, and 150c of the power grid is 2 amperes (A). (The difference in power exchanged between L1 and L2 is 6A–5A (which is 1A), between L1 and L3 is 7A–5A (which is 2A), and between L2 and L3 is 7A–6A (which is 1A)). Since the maximum permissible asymmetry (power threshold) is 16A (as shown in the eighth column), the current setpoint should not be changed as indicated by the values ​​in the last three columns of the fourth row.

[0055] As another example, see the fifth row, which indicates (the first three columns of the row) that energy storage 106 draws 16 volts from the first power connector 150a (L1) of the power grid 108, 16 volts from the second power connector 150b (L2) of the power grid 108, and 16 volts from the third power connector 150c (L3) of the power grid 108. The fourth and sixth columns of the fifth row indicate the power exchanged at connection point 110: -5A at the first power connector 150a (L1) of the power grid 108, 15A at the second power connector 150b (L2) of the power grid 108, and 0A at the third power connector 150c (L3) of the power grid 108. The seventh column of the fifth row indicates the maximum difference in power exchanged between the different power connectors 150a, 150b, and 150c of the power grid, which is 20A (the difference in power exchanged between L1 and L2 is 15A – (-5)A (20A), the difference in power exchanged between L1 and L3 is 15A – 0A (15A), and the difference in power exchanged between L2 and L3 is 0A – (-5)A (5A). Since the maximum permissible asymmetry (power threshold) is 16A (as shown in the eighth column), the maximum difference in power exchanged between the different power connectors 150a, 150b, and 150c... If the power threshold of 4A is exceeded, and the current setpoint should change as indicated by the values ​​in the last three columns of the fifth row, the updated setpoint will instruct energy storage 106 to draw 12 volts from the first power connector 150a (L1) of the grid 108 (4 volts less than the previous setpoint), 12 volts from the second power connector 150b (L2) of the grid 108, and 12 volts from the third power connector 150c (L3) of the grid 108. In this way, energy storage 106 helps the grid 106 restore the required level of symmetry more quickly.

[0056] Figure 1B This is a schematic diagram of a system 500 for charging an energy storage device 106, according to at least one example of this disclosure. Figure 1A-I Related reference numerals are used to indicate the same elements.

[0057] Figure 1B The system 500 shows an electric vehicle 112 including an energy storage device 106. Figure 1B System 100 also shows a power supply device 104 connected to the power grid 508 via a connection point 110 of the house 124. The power grid 508 includes a single conductor or current line. However, the power grid 508 may include any number of conductors or current lines.

[0058] House 124 includes power supply equipment 104 and other loads and / or generators 122 belonging to house 124 (such as, for example, a photovoltaic system), such that power exchange in both directions between the power grid 508 and house 124 can occur by connecting the power grid 508 to the power supply equipment 104 and other loads and / or generators 122 via power connection 560. Power supply equipment 104 is connected to electric vehicle 112 via power cable 520.

[0059] Energy storage device 106 can be connected to and disconnected from power supply device 104 via power cable 520. In this way, when energy storage device 106 is connected to power supply device 104, energy storage device 106 can supply power to grid 108 and consume power from grid 108.

[0060] The electric vehicle 112 may include a DC-to-AC (and AC-to-DC) converter, for example, as part of the distribution board measurement circuit 130. In this way, the power supply device 104 can act as a switch and allow power to pass through it in both directions.

[0061] The power supply device 104 includes a control unit 502. However, the control unit 502 may also be located at the electric vehicle 112. The control unit 502 is configured to receive first data indicating the electrical force supplied from the energy storage device 106 to the power grid 508. The control unit 502 is also configured to use the first data to determine that the electrical force supplied from the energy storage device 106 to the power grid 508 exceeds the maximum permissible power.

[0062] If the control unit 502 determines that the power supplied from the energy storage unit 106 to the power grid 508 exceeds the maximum permissible power, the control unit 502 is configured to provide a control signal to the power supply device 104, which instructs the energy storage unit 106 to reduce the power supplied from the energy storage unit to the power grid 508 and to supply another power from the energy storage unit 106 to another energy storage unit in other loads and / or generator 122.

[0063] For example, the control unit 502 can be connected to the energy storage unit 106 via the communication line 226, so that the energy storage unit 106 can receive control signals via the communication line 226.

[0064] When control unit 502 determines that the electrical power supplied from energy storage 106 to grid 508 exceeds the maximum permissible power, control unit 502 can provide a control signal indicating that additional electrical power that energy storage 106 should supply to another energy storage device should be based on a reduction in the amount of power supplied from energy storage 106 to grid 508. Specifically, the additional electrical power that energy storage 106 should supply to another energy storage device can be equal to the reduction in the amount of power supplied from the energy storage device to the grid.

[0065] The maximum allowable power for grid 508 can be set by the service provider that manages grid 508.

[0066] Based on the situation of power grid 508, the service provider managing power grid 508 can impose active power limitation on the generator. For example, if energy storage 106 can continuously generate 10 kilowatts (kW), but due to grid constraints, the maximum permissible power is only 6 kW, then energy storage 106 can supply electricity at full capacity, and the excess electricity can be supplied for the consumption of the house downstream of grid connection point 110. In this way, the energy storage is used optimally.

[0067] The power supply device 104 can communicate control signals to the electric vehicle 112 via communication line 226 and using communication protocols such as ISO 15118-2, ISO 15118-20, IEC 61851, or DIN 70121. However, any other communication standard can be used to communicate possible / permitted operations such as wireless, Bluetooth, etc.

[0068] Figure 2A A flowchart is shown of a method for controlling a power supply device 104, which is configured to supply power between an energy storage device 106 and a power grid 108 that supplies power to a connection point 110, and the power grid 108 includes a plurality of power conductors 150.

[0069] In step 202, Figure 2A The method receives the first data indicating the power exchanged at connection point 110.

[0070] In step 204, Figure 2A The method uses first data to determine that the difference in power exchanged between a pair of power conductors among a plurality of power conductors 150 is above a power threshold.

[0071] After determining in step 204 that the difference in power exchanged between a pair of power conductors among the plurality of power conductors 150 is above a power threshold, the method proceeds to step 206 and provides a control signal to the power supply device 104 indicating the power setpoint of the energy storage device 108.

[0072] First data indicating the difference in power exchanged at the connection point can be obtained based on multiple measurements of the exchanged power. For example, at different times, the power at each conductor in a pair of conductors can be measured, and the difference between the power measured at each conductor at each different time can be calculated. Then, if more than a certain number of the calculated differences are above a power threshold, then... Figure 2A The method can determine in step 204 that the difference in power exchanged between the pair of electrical conductors is above a power threshold. The measured power can be stored in internal memory.

[0073] Figure 2B A flowchart is shown of a method for controlling a power supply device 104, which is configured to supply power between an energy storage device 106 and a power grid 108 that supplies power to a connection point 110.

[0074] In step 202, Figure 2B The method receives first data indicating the electrical power supplied from the energy storage unit 106 to the power grid 108.

[0075] In step 204, Figure 2B The method uses first data to determine whether the electrical power supplied from energy storage 106 to grid 108 exceeds the maximum permissible power.

[0076] After determining in step 204 that the electrical power supplied from energy storage 106 to grid 108 exceeds the maximum permissible power, the method proceeds to step 206 and provides a control signal to power supply device 104, which instructs energy storage 106 to reduce the electrical power supplied from energy storage 106 to grid 108 and to supply additional electrical power from energy storage 106 to another energy storage device 122.

[0077] Figure 3 A block diagram of a device 302 for a power supply device 104 is shown, the device including components configured to perform... Figure 2A Methods and / or Figure 2B The method includes control unit 102 and / or control unit 502. Device 302 may include control unit 102, memory 306, and communication unit 310. Control unit 102 and / or control unit 502 may include central processing unit (CPU) connected to memory 306 and communication unit 310.

[0078] Memory 306 may include any suitable known storage device to store data and / or instructions to be executed on control unit 102 and / or control unit 502, and may include any known type of volatile and non-volatile storage device, RAM and ROM type storage, etc. The storage device may be used to store multiple measurements used for... Figure 2A In step 204 of the method, it is determined whether the power exchanged between a pair of power conductors among a plurality of power conductors is above a power threshold.

[0079] The communication unit 310 is configured to send signals to or receive signals from devices external to the control unit 102 and / or control unit 502, such as the electric vehicle 112 or the measuring device 114. Any known and suitable transceiver device can use any known or still-developing (standard) communication technology (including 2G, 3G, 4G, 5G, Wi-Fi, Bluetooth, NFC, etc.) for this purpose. For this purpose, the communication unit 310 can be connected to a network and an antenna.

[0080] While this disclosure has been described with reference to exemplary embodiments, those skilled in the art will understand that various changes can be made and elements can be substituted with equivalents without departing from the scope of this disclosure. Furthermore, many modifications can be made to adapt particular situations or materials to the teachings of this disclosure without departing from the basic scope of this disclosure. Therefore, it is intended that this disclosure be limited to the specific embodiments disclosed, but rather that this disclosure will include all embodiments falling within the scope of the appended claims.

Claims

1. A control unit (102) for controlling a power supply device (104), the power supply device (104) being configured for power supply between an energy storage device (106) and a power grid (108) supplying power to a connection point (110), the power grid (108) comprising a plurality of power conductors (150), the control unit being configured to: • Receive first data indicating the power exchanged at the connection point (110); • Using the first data, determine that the difference in power exchanged between a pair of power conductors among the plurality of power conductors (150) is above a power threshold; and • Provide the power supply equipment (104) with a control signal indicating the power setpoint of the energy storage device (106).

2. A method for controlling a power supply device (104), the power supply device being configured for power supply between an energy storage device (106) and a power grid (108) supplying power to a connection point (110), the power grid (108) comprising a plurality of power conductors (150), the method comprising: • Receive (202) first data indicating the power exchanged at the connection point (110); • Use the first data to determine (204) that the difference in power exchanged between a pair of power conductors among the plurality of power conductors (150) is above a power threshold; as well as • Provide (206) a control signal to the power supply equipment (104) indicating the power setpoint of the energy storage device (106).

3. The control unit (102) according to claim 1 or the method according to claim 2, wherein, The control signal instructs the energy storage device (106) to supply power to or draw power from at least one of the plurality of power conductors (150) of the power grid (108).

4. The control unit (102) according to any one of claims 1 and 3, or the method according to any one of claims 2 and 3, wherein, The power setpoint indicated by the control signal is based on the maximum difference among the differences in the power exchanged between each pair of power conductors in the plurality of power conductors (150).

5. The control unit (102) according to any one of claims 1 and 3-4 or the method according to any one of claims 2-4, wherein, The power grid (108) includes three power conductors.

6. The control unit according to any one of claims 1 and 3-5 or the method according to any one of claims 2-5, wherein, The first data is received from the measuring device (114) connected to the connection point (110).

7. A control unit (502) for controlling a power supply device (104), the power supply device being configured for power supply between an energy storage device (106) and a power grid (508) supplying power to a connection point (110), the control unit being configured to: • Receive (212) first data indicating the electrical power supplied from the energy storage unit (106) to the power grid (108); • Using the first data, determine (214) that the electrical power supplied from the energy storage unit (106) to the power grid (508) exceeds the maximum permissible power; and • Provide a (216) control signal to the power supply equipment, the control signal instructing the energy storage device to reduce the power supplied from the energy storage device to the power grid and to supply another power from the energy storage device to another energy storage device.

8. A method for controlling a power supply device configured for power supply between an energy storage device and a power grid supplying power to a connection point, the method comprising: • Receive (212) first data indicating the electrical power supplied from the energy storage unit to the power grid; • Using the first data, determine (214) whether the electrical power supplied from the energy storage device to the power grid exceeds the maximum permissible power; as well as • Provide a (216) control signal to the power supply device, the control signal instructing the energy storage device to reduce the power supplied from the energy storage device to the power grid, and to supply another power from the energy storage device to another energy storage device.

9. The control unit according to claim 7 or the method according to claim 8, wherein, The other energy storage device is located at the house, and the power grid is configured to supply electricity to the house.

10. The control unit according to any one of claims 7 and 9 or the method according to any one of claims 8-9, wherein, The additional electrical force supplied from the energy storage unit to the other energy storage unit is based on the reduction in the amount of electricity supplied from the energy storage unit to the power grid.

11. The control unit according to any one of claims 7 and 9-10 or the method according to any one of claims 8-10, wherein, The additional electrical force supplied from the energy storage unit to the other energy storage unit is equal to the reduction in the amount of electricity supplied from the energy storage unit to the power grid.

12. The control unit according to any one of claims 7 and 9-11 or the method according to any one of claims 8-11, wherein, The maximum allowable power of the power grid is set by the service provider that manages the power grid.

13. The control unit according to any one of claims 1, 3-7, and 9-12, or the method according to any one of claims 2-6 and 8-12, wherein, The energy storage device is located in the electric vehicle.

14. A power supply device comprising a control unit according to any one of claims 1, 3-7 and 9-13.

15. An electric vehicle comprising a control unit according to any one of claims 1, 3-7 and 9-13.

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