System and method for relieving the load on a local electricity grid and a superordinate electricity grid

Abstract

The invention relates to a system (1) for relieving the load on a local electricity grid (2) and a superordinate electricity grid (4), which are electrically coupled to one another at a grid infeed point (6), comprising at least one charging unit (8) electrically connectable to the local electricity grid (2), for electrically charging an electrically operated vehicle (10, 14), the charging unit (8) having an electricity store (18), and comprising a computing unit (20) coupled to the at least one charging unit (8) in terms of signaling and having a processor (22), a data memory (24) and a receiving unit (26) for receiving grid data representing at least one demand for an electrical power of the local electricity grid (2) and a grid frequency of the superordinate electricity grid (4), the computing unit (20) being configured, on the basis of the grid data, to determine an electrical power to be provided to the superordinate electricity grid (4) and / or to the local electricity grid (2), and the computing unit (20) being configured to control charging and / or discharging of the electricity store (18) in such a way that the determined electrical power is provided to the superordinate electricity grid (4) and / or to the local electricity grid (2).

Description

[0001] System and method for relieving the load on a local power grid and a higher-level power grid

[0002] The invention relates to a system and a method for relieving the load on a local power grid and a higher-level power grid, a computing unit, a local power grid, a data processing device, a computer program product, a computer-readable data carrier and a data carrier signal.

[0003] Systems for relieving the load on local power grids and higher-level power grids are generally known. A power grid is generally understood to be a network for the transmission and distribution of electrical energy, also known as an electricity grid. A power grid includes electrical lines such as overhead lines and underground cables, as well as associated facilities such as

[0004] Switchgear and transformer stations.

[0005] Power grids can be classified, among other things, by their voltage, with distinctions being made between extra-high voltage, high voltage, medium voltage, and low voltage. Higher-level power grids are generally characterized by the fact that they distribute electricity. A local power grid typically supplies consumers, such as private households, office buildings, and commercial units. In addition to the aforementioned consumers, local power grids can also contain power generators, such as photovoltaic systems.

[0006] Due to the increased use of renewable energies, electricity production fluctuates more than was intended in existing power grids when they were created, making maintaining a predefined grid frequency more complex. Furthermore, electricity demand in private households and commercial units is continuously rising due to the increasing use of electrically powered units. This includes the use of electric vehicles for both private and commercial purposes.

[0007] Electric vehicles are typically charged using charging units. Charging units often have a maximum charging power of several hundred kilowatts. Local power grids are often not designed for such charging units. Therefore, charging units for electric vehicles can have power storage units to provide high charging power for short periods. A short-term provision of charging power is usually sufficient, as the maximum possible charging power decreases as the battery charge level of an electric vehicle increases. Therefore, the expensive power storage units of charging units are rarely in operation.

[0008] US 11,007,891 B1 discloses a system for providing fast charging power for electrically powered vehicles, wherein power can be provided to a local power grid using local energy management. One disadvantage of this system is that it does not address the higher-level power grid and thus the challenges described above regarding the higher-level power grid are not addressed. DE 10 2016 008 666 A1, DE 10 2017 108 579 A1, US 2018 / 0358839 A1, and EP 3 442 823 B1 describe further approaches for providing charging power for electrically powered vehicles.It is an object of the invention to provide a system and a method for relieving the load on a local power grid and a higher-level power grid, a computing unit, a local power grid, a data processing device, a computer program product, a computer-readable data carrier, and a data carrier signal that reduce or eliminate one or more of the aforementioned disadvantages. In particular, it is an object of the invention to provide a solution that enables the relief of the load on a local power grid and a higher-level power grid.

[0009] This object is achieved with a system, a computing unit, a computer-implemented method, a data processing device, a computer program product, a computer-readable data carrier, and a data carrier signal according to the features of the independent patent claims. Further advantageous embodiments of these aspects are specified in the respective dependent patent claims. The features disclosed in the patent claims, the description, and the drawings can be individually combined with one another in any technologically expedient manner, thereby demonstrating further embodiments of the invention.

[0010] According to a first aspect, the object is achieved by a system for relieving the load on a local power grid and a higher-level power grid, which are electrically coupled to one another at a grid feed-in point, comprising at least one charging unit that can be electrically connected to the local power grid for electrically charging an electrically powered vehicle, wherein the charging unit has a power storage device, a computing unit that is signal-coupled to the at least one charging unit and has a processor, a data storage device, and a receiving unit for receiving grid data that represents at least a demand for electrical power from the local power grid and a grid frequency of the higher-level power grid, wherein the computing unit is configured to determine, based on the grid data, an electrical power to be provided to the higher-level power grid and / or the local power grid, and wherein the computing unit is configuredto control charging and / or discharging of the power storage device in such a way that the determined electrical power is provided to the higher-level power grid and / or the local power grid.

[0011] The invention is based on the finding that a system for relieving the load on a local power grid and a higher-level power grid must be designed to meet the diverse technical requirements of power grids. Furthermore, the invention was based on the finding that the electrical power stored in charging units for electrically powered vehicles should not be used statically for a specific application, but rather should be made available as needed, either to the local power grid or to the higher-level power grid. Thus, depending on the urgency, the power can be provided either to the local power grid, for example, for peak load shedding, or to the higher-level power grid, for example, for frequency stabilization.It is self-evident to the person skilled in the art that a charging unit arranged in a local power grid always provides electrical power directly to the local power grid and not directly to a higher-level power grid, even if the electrical power is to be provided to the higher-level power grid.

[0012] The system is designed to relieve the load on the local power grid and the higher-level power grid, although the local power grid and the higher-level power grid are not part of the system. During normal operation, the system is embedded in the local power grid and / or the higher-level power grid.

[0013] A local power grid is understood in particular to be a power grid that supplies private and / or commercial consumers with electricity. The local power grid can, for example, be an area grid and / or a distribution grid. The local power grid can be a medium- or low-voltage grid. A higher-level power grid is understood in particular to be a power grid that supplies local power grids with electricity. The higher-level power grid can, for example, be a transmission grid. Large power generation systems, such as power plants or wind farms, are usually arranged in higher-level power grids. This does not, of course, preclude power generation systems, such as photovoltaic systems, from also being arranged in local power grids.

[0014] The system comprises at least one charging unit that can be electrically connected to the local power grid for electrically charging an electrically powered vehicle, wherein the charging unit has a power storage device. Such a charging unit is also referred to as a charging point or charging column. Electrically powered vehicles can be electrically connected to the charging unit, for example, by means of a charging cable, so that electrical power can be transferred from the charging unit to a battery of the electrically powered vehicle. The power storage device can, in particular, be a battery. In particular, the battery can already have a reduced service life, for example because the battery was previously used in an electrically powered vehicle.

[0015] The system further comprises the computing unit which is signal-linked to the at least one charging unit. The computing unit has the processor, the data memory and the receiving unit for receiving network data. The processor, the data memory and / or the receiving unit can be arranged and / or designed separately and / or at different locations from one another. Individual components of the computing unit can be located in a cloud or can be mapped in or to the cloud. Furthermore, they can be designed and / or arranged in combination. For this purpose, the computing unit or components of the computing unit can be signal-linked to the cloud. The signal-linking can be wired or wireless, in particular via mobile radio. The computing unit can, for example, be a computer or comprise one.The computing unit can be arranged independently of the charging unit and / or the local power grid, whereby in particular a signaling connection is required for data exchange.

[0016] The grid data represents at least a demand for electrical power in the local power grid and a grid frequency of the higher-level power grid. The grid data can directly or indirectly represent the demand for electrical power in the local power grid and the grid frequency of the higher-level power grid.

[0017] The demand for electrical power from the local power grid can be either a current demand or a forecast demand. The current demand and / or the forecast demand can, for example, be the sum of the demands of the consumers located in the local power grid. Furthermore, this demand can be represented in the form of a grid frequency, a voltage, an electricity price, and / or an amperage. Furthermore, the demand for electrical power can be based on commodity prices and / or weather conditions.

[0018] The grid frequency of the higher-level power grid can usually be recorded in real time, and data representing the grid frequency can be provided. The grid frequency decreases when electricity consumption exceeds electricity generation. The grid frequency increases when electricity consumption is less than electricity generation. Since the grid frequency must be kept essentially constant, frequency stabilization can be achieved by feeding in or taking in electricity.

[0019] The computing unit is configured to determine the electrical power to be provided to the higher-level power grid and / or the local power grid based on the grid data. The determined electrical power can be determined depending, among other things, on the available electrical power, the capacity, and / or the energy content of the power storage unit. In practice, the electrical power to be provided to the higher-level power grid is usually marketed. For this purpose, an expected price is forecast in order to generate an economically optimized schedule for storage marketing based on this and taking into account a load forecast.

[0020] The computing unit is further configured to control charging and / or discharging of the power storage device such that the determined electrical power is provided to the higher-level power grid and / or the local power grid. In other words, the computing unit is configured to determine the electrical power to be provided, for example, for peak load capping or for grid frequency stabilization, as explained in more detail below, and then subsequently control the power storage device such that this electrical power is provided. The electrical power to be provided is preferably determined by the computing unit based, among other things, on an available capacity, in particular of the charging unit.

[0021] The charging unit therefore serves a higher-level function within the local power grid, namely to not only provide electrical power for the local power grid but also to influence the higher-level power grid. The provision of electrical energy for the local power grid also indirectly influences the higher-level power grid, since, for example, the electrical power to be provided to the local power grid can be reduced by the higher-level power grid. In addition to frequency stabilization and peak load shaving, the system offers a temporal shifting of local consumption and generation, thus enabling atypical grid use. In addition, electrical power can be stored in the event of electricity overproduction, for example when renewable energy sources generate high electrical power.

[0022] In a preferred embodiment of the system, the electrical power to be provided to the higher-level power grid is or includes control power to influence the grid frequency of the higher-level power grid. If power generation is lower than power demand, the grid frequency of a higher-level power grid is reduced. This effect is counteracted by feeding additional electrical power into the higher-level power grid. This electrical power, referred to as control power, is provided by the charging unit's power storage unit. This stabilizes the higher-level power grid on the one hand, and enables economic advantages for the charging unit operator on the other.

[0023] It is further preferred that the electrical power to be provided to the local power grid be or include a peak load power in order to reduce the electrical power to be provided to the local power grid by the higher-level power grid. A peak load power is used for peak load capping. Particularly during times of high energy consumption within the local power grid, the provision of a peak load power can be advantageous, on the one hand, to relieve the load on the higher-level power grid and, on the other hand, to allow the charging unit operator to benefit from the high electricity prices typically associated with this time.

[0024] In a further preferred embodiment of the system, the system comprises two or more charging units with power storage units, and the computing unit is configured to map the two or more power storage units in a data model as a virtual power plant, to determine excess power from the power storage units, and to control the discharging of the power storage units such that the excess power from the power storage units is made available to the higher-level power grid. The computing unit or components of the computing unit are preferably mapped in a cloud.

[0025] The surplus power of the two or more power storage units is, in particular, the available electrical power minus reserve power. Such reserve power is typically used to hedge existing delivery obligations.

[0026] A further preferred development of the system is characterized in that the computing unit is configured to forecast a power demand of the local power grid and / or the higher-level power grid based on the grid data and to determine, depending on this power demand, whether the peak load power or the control power is provided.

[0027] The electricity demand of the local power grid and / or the higher-level power grid can be forecasted directly or indirectly. Electricity demand can also be determined abstractly. For example, depending on whether the electricity demand of the local power grid or the higher-level power grid is higher, the higher electricity demand can be met. A higher electricity demand can be determined, for example, using an electricity price.

[0028] In a further preferred embodiment, the computing unit is configured to generate, based on the grid data, a time-dependent first forecast requirement for the control power and a time-dependent second forecast requirement for the peak load power for a predetermined period of time. The computing unit is further configured to determine, depending on the first forecast value and the second forecast value, whether the peak load power or the control power is provided. With a computing unit configured in this way, a plan for coordinating the different power requirements and / or for providing the different functions, also referred to as a power schedule, can be generated, which can be operated, among other things, by means of the charging unit and the power storage unit.

[0029] In a further preferred embodiment of the system, the charging unit is arranged and configured to provide an electrically powered vehicle with charging power such that the peak load power or the control power can be provided, in particular without restriction. For example, the charging power can be reduced in order to provide the peak load power or the control power.

[0030] It is further preferred that the charging unit be arranged and configured to provide a negative charging power to ensure the provision of the peak load power or the control power. For example, the electrical power stored in a battery of an electrically powered vehicle can thus be used to provide the peak load power and / or the control power.

[0031] In a further preferred embodiment of the system, the grid data represents a power demand or a forecast value of the power demand of power consumers located in the local power grid and / or a forecast power consumption in the higher-level power grid. The power demand, the forecast value of the power demand, or the forecast power consumption can be represented directly or indirectly.

[0032] A preferred development of the system is characterized in that the charging unit is arranged and configured to provide emergency electrical power to a sub-grid of the local power grid or to the local power grid, and the computing unit is configured to detect a failure of the higher-level power grid and to control the charging unit such that the emergency power is provided to the sub-grid and / or the local power grid when the failure is detected. With a charging unit configured in this way, emergency power can advantageously be offered to a consumer when a standard power supply is not available.

[0033] Furthermore, it may be preferred that the emergency power is used for black start in order to restart the local power grid after a failure of the higher-level power grid, while maintaining a grid frequency.

[0034] According to a further aspect, the object mentioned at the outset is achieved by a computing unit having a processor, a data memory and a receiving unit for receiving network data which represent at least a demand for electrical power from a local power grid and a network frequency of a higher-level power grid, wherein the computing unit can be coupled by signaling to a charging unit comprising a power storage device for electrically charging an electrically powered vehicle, wherein the computing unit is configured to determine an electrical power to be provided to the higher-level power grid and / or the local power grid based on the network data, and wherein the computing unit is configured to control charging and discharging of the power storage device such that the determined electrical power is provided to the higher-level power grid and / or the local power grid.

[0035] According to a further aspect, the object mentioned at the outset is achieved by a local power grid which, during normal operation, can be electrically coupled to a higher-level power grid at a grid feed-in point, comprising a system or a computing unit according to one of the embodiments described above.

[0036] According to a further aspect, the object mentioned at the outset is achieved by a computer-implemented method for relieving the load on a local power grid and a higher-level power grid, which are electrically coupled to one another at a grid feed-in point, comprising the steps of: receiving grid data which represent at least a demand for electrical power of the local power grid and a grid frequency of the higher-level power grid, determining an electrical power to be provided to the higher-level power grid and / or the local power grid based on the grid data, and controlling a charging unit with an electricity storage device for electrically charging an electrically powered vehicle in such a way that the electricity storage device is charged and / or discharged based on the determined electrical power, so that the determined electrical power is provided to the higher-level power grid and / or the local power grid.

[0037] In a preferred development of the computer-implemented method, it is provided that the electrical power provided to the higher-level power grid is or includes a control power in order to influence the grid frequency of the higher-level power grid. Furthermore, it is preferred that the electrical power provided to the local power grid is or includes a peak load power in order to reduce the electrical power to be provided to the local power grid by the higher-level power grid.

[0038] In a further preferred embodiment of the computer-implemented method, it is provided that it comprises the step of forecasting an electricity demand of the local power grid and / or the higher-level power grid based on the grid data, and providing the peak load power or the control power depending on the forecast electricity demand, so that the higher electricity demand is met. This embodiment provides that the electricity demand of the local power grid and the higher-level power grid is first forecast and, on this basis, a decision is made as to whether the peak load power or the control power is provided. This decision is based on the knowledge of whether the electricity demand of the local power grid or the higher-level power grid is higher. In particular, the electricity demand of the higher-level power grid naturally refers to the electricity that can be provided by the electricity storage device.Furthermore, it is preferred that it is determined whether the peak load power or the control power is provided depending on the power demand.

[0039] In a further preferred embodiment of the computer-implemented method, it is provided that it comprises the steps of: detecting a failure of the higher-level power grid, and providing an emergency power for a sub-network of the local power grid or the local power grid when the failure is detected.

[0040] According to a further aspect, the object mentioned at the outset is achieved by a device for data processing, in particular a computing unit according to the embodiment variant described above, comprising means for carrying out the steps of the method in one of the embodiment variants described above.

[0041] According to a further aspect, the object mentioned at the outset is achieved by a computer program product comprising instructions which, when the program is executed by a processor, cause the processor to carry out the steps of the method according to one of the embodiments described above.

[0042] According to a further aspect, the object mentioned at the outset is achieved by a computer-readable data carrier on which the computer program product according to the aspect described above is stored.

[0043] According to a further aspect, the object mentioned at the outset is achieved by a data carrier signal which transmits the computer program product according to the aspect described above.

[0044] For further advantages, design variants and details of the individual aspects and their possible further training, please refer to the description of the other aspects, the corresponding features and further training.

[0045] Preferred embodiments are explained using the accompanying figures. They show:

[0046] Figure 1: a schematic view of an exemplary embodiment of a system for relieving the load on a local power grid and a higher-level power grid; Figure 2: a schematic view of an exemplary embodiment of a system for relieving the load on a local power grid and a higher-level power grid;

[0047] Figure 3: a schematic view of an exemplary method for

[0048] Relieving the load on a local power grid and a higher-level power grid.

[0049] In the figures, identical or essentially functionally identical or similar elements are designated by the same reference numerals.

[0050] Figures 1 and 2 show a system 1 for relieving the load on a local power grid 2 and a higher-level power grid 4, which are electrically coupled to each other at a grid feed-in point 6. A transformer substation, for example, can operate at the grid feed-in point 6 to reduce the voltage of the higher-level power grid 4 for the local power grid 2. A power plant 44, which provides electrical energy, is coupled to the higher-level power grid 4.

[0051] Various consumers are arranged in the local power grid 2, including a commercial unit 30 and private consumers 34-42, which are arranged within a sub-grid 32. The commercial unit 30 and / or the private consumers 34-42 can also act as power generators temporarily or permanently. A charging unit 8 for electrically charging electrically powered vehicles 10, 12 is provided with the local power grid 2. The charging unit 8 comprises a power storage device 18, which can be designed, for example, as a battery. Batteries 12, 16 of the vehicles 10, 14 can be charged by means of the charging unit 8.

[0052] A computing unit 20 is also signal-coupled to the charging unit 8. The computing unit 20 comprises a processor 22, a data memory 24, a receiving unit 26, and a transmitting unit 28. The receiving unit 26 is designed to receive grid data. The grid data represents at least a demand for electrical power of the local power grid 2 and a grid frequency of the higher-level power grid 4. The computing unit 20 is configured to determine, based on this grid data, an electrical power to be provided to the higher-level power grid 4 and / or the local power grid 2. The electrical power to be provided to the higher-level power grid 4 can, for example, be control power to influence the grid frequency of the higher-level power grid 4. This can be used, in particular, for frequency stabilization.

[0053] Furthermore, the electrical power can be a peak load power for the local power grid 2 in order to reduce the electrical power to be provided to the local power grid 2 by the higher-level power grid 4. Particularly in times of high demand for electrical power within the local power grid 2, such a peak load power for peak load capping can be desirable in order to reduce the costs of the electricity to be provided.

[0054] The computing unit 20 is further configured to map a plurality of power storage units from a plurality of charging units (not shown here) in a data model as a virtual power plant. Using the virtual power plant, the computing unit 20 can determine excess power from the power storage units. Furthermore, the computing unit 20 can control the discharging of the power storage units or a portion of the power storage units or units such that the excess power from the power storage units is provided to the higher-level power grid 4. Such provision of excess power may be desirable, particularly during times when frequency stabilization is required in the higher-level power grid 4.

[0055] The charging unit 8 is further arranged and configured to provide emergency electrical power to the sub-grid 32. For this purpose, the computing unit 20 is configured to detect a failure of the higher-level power grid 4 and to control the charging unit 8 such that the emergency power is provided when the failure is detected.

[0056] Figure 3 shows a schematic view of an exemplary computer-implemented method for relieving the load on a local power grid 2 and a higher-level power grid 4. In step 500, grid data is received that represents at least the electrical power demand of the local power grid 2 and the grid frequency of the higher-level power grid 4. In step 502, the power demand of the local power grid 2 and the higher-level power grid 4 is forecast based on the grid data. This forecast can be made based on various grid data, which is technically possible on the one hand, and indirectly possible using economic data on the other.

[0057] In step 504, an electrical power to be provided to the higher-level power grid 4 and / or the local power grid 2 is determined based on the grid data and / or based on the forecast power demand.

[0058] In step 506, the charging unit 8 is controlled so that, based on the determined electrical power, the power storage 18 of the charging unit 8 is charged or discharged so that the determined electrical power is made available to the higher-level power grid 4 and / or the local power grid 2.

[0059] The system described above and the corresponding computer-implemented method have the advantage that, by means of the charging unit and in particular a plurality of charging units, a significant influence on a local power grid and, at the same time, on a higher-level power grid, for example, a supply grid, is possible. This multiple function is necessary to address the different demands in the local power grid and the higher-level power grid and, in particular, to utilize the power storage unit of the charging unit 8 as continuously as possible. Due to the high cost of a power storage unit 18, it can be used particularly economically if it can be used for other applications outside of the actual charging process and the local power grid 2. Thus, the system 1 contributes, on the one hand, to the technical improvement of the power grids 2, 4 used and, on the other hand, leads to the economical use of charging units 8 with power storage units 18.REFERENCE SIGN.

[0060] 1 system

[0061] 2 local power grid

[0062] 4 higher-level power grid

[0063] 6 Grid feed-in point

[0064] 8 loading unit

[0065] 10 vehicles

[0066] 12 Battery

[0067] 14 vehicles

[0068] 16 Battery

[0069] 18 power storage units

[0070] 20 computing units

[0071] 22 processors

[0072] 24 data storage

[0073] 26 Receiving unit

[0074] 28 Transmitter unit

[0075] 30 commercial units

[0076] 32 subnetwork

[0077] 34 consumers

[0078] 36 consumers

[0079] 38 consumers

[0080] 40 consumers

[0081] 42 consumers

[0082] 44 Power Plant

Claims

CLAIMS System (1) for relieving the load on a local power grid (2) and a higher-level power grid (4), which are electrically coupled to one another at a grid feed-in point (6), comprising at least one charging unit (8) electrically connectable to the local power grid (2) for electrically charging an electrically powered vehicle (10, 14), wherein the charging unit (8) has a power storage device (18), a computing unit (20) signal-coupled to the at least one charging unit (8) and having a processor (22), a data storage device (24), and a receiving unit (26) for receiving grid data representing at least a demand for electrical power of the local power grid (2) and a grid frequency of the higher-level power grid (4), wherein the computing unit (20) is configured to determine, based on the grid data, an electrical power to be provided to the higher-level power grid (4) and / or the local power grid (2),and wherein the computing unit (20) is configured to control charging and / or discharging of the power storage device (18) such that the determined electrical power is provided to the higher-level power grid (4) and / or the local power grid (2). System (1) according to the preceding claim, wherein the electrical power to be provided to the higher-level power grid (4) is or comprises a control power in order to influence the grid frequency of the higher-level power grid (4), and / or the electrical power to be provided to the local power grid (2) is or comprises a peak load power in order to reduce the electrical power to be provided to the local power grid (2) by the higher-level power grid (4). System (1) according to one of the preceding claims, wherein, the system (1) comprises two or more charging units (8) with power storage units (18), and the computing unit (20) is configured to map the two or more power storage units (18) in a data model as a virtual power plant and to determine an excess power of the power storage units (18) and to control a discharging of the power storage units (18) such that the excess power of the power storage units (18) is made available to the higher-level power grid. m (1) according to one of the preceding claims, wherein the computing unit (20) is configured to forecast an electricity demand of the local power grid (2) and / or the higher-level power grid (4) based on the grid data and to determine, depending on this electricity demand, whether the peak load power or the control power is made available.m (1) according to one of the preceding claims, wherein the computing unit (20) is configured to generate, based on the network data, a time-dependent first forecast requirement for the control power and a time-dependent second forecast requirement for the peak load power for a predetermined period of time, and the computing unit (20) is configured to determine, depending on the first forecast value and the second forecast value, whether the peak load power or the control power is provided. m (1) according to one of the preceding claims, wherein the charging unit (8) is arranged and designed to provide an electrically operated vehicle with a charging power such that the peak load power or the control power can be provided, in particular without restriction. m (1) according to one of the preceding claims, wherein. the charging unit (8) is arranged and designed to provide a negative charging power to ensure the provision of the peak load power or the control power.

8. System (1) according to one of the preceding claims, wherein the network data represent a power demand or a forecast value of the power demand of power consumers (30, 34-42) arranged in the local power grid (2) and / or a forecast power consumption in the higher-level power grid (4).

9. System (1) according to one of the preceding claims, wherein the charging unit (8) is arranged and designed to provide an emergency electrical power to a sub-network (32) of the local power grid (2) or to the local power grid (2), and the computing unit (20) is designed to detect a failure of the higher-level power grid (4) and to control the charging unit (8) in such a way that the emergency power is provided to the sub-network (32) and / or the local power grid (2) when the failure is detected.

10. A computing unit (20) comprising a processor (22), a data memory (24) and a receiving unit (26) for receiving network data representing at least a demand for electrical power of a local power grid (2) and a network frequency of a higher-level power grid (4), - wherein the computing unit (20) can be coupled by signaling to a charging unit (8) comprising a power storage device (18) for electrically charging an electrically powered vehicle, - wherein the computing unit (20) is configured to determine an electrical power to be provided to the higher-level power grid (4) and / or the local power grid (2) based on the grid data, and - wherein the computing unit (20) is configured to control charging and discharging of the power storage device (18) such that the determined electrical power is provided to the higher-level power grid (4) and / or the local power grid (2). A local power grid (2) that, during normal operation, can be electrically coupled to a higher-level power grid (4) at a grid feed-in point (6), comprising a system (1) according to any one of the preceding claims 1-9 or a computing unit (20) according to the preceding claim 10. A computer-implemented method for relieving the load on a local power grid (2) and a higher-level power grid (4) that are electrically coupled to one another at a grid feed-in point (6), comprising the steps: Receiving (500) network data representing at least a demand for electrical power of the local power grid (2) and a network frequency of the higher-level power grid (4), determining (504) an electrical power to be provided to the higher-level power grid (4) and / or the local power grid (2) based on the network data, and Controlling (506) a charging unit (8) with a power storage device (18) for electrically charging an electrically powered vehicle such that, based on the determined electrical power, the power storage device (18) is charged and / or discharged, so that the determined electrical power is provided to the higher-level power grid (4) and / or local power grid (2). Computer-implemented method according to the preceding claim 12, wherein the electrical power provided to the higher-level power grid (4) is or comprises a control power in order to influence the grid frequency of the higher-level power grid (4), and / or the electrical power provided to the local power grid (2) is or includes a peak load power in order to reduce an electrical power to be provided to the local power grid (2) by the higher-level power grid (4).

14. A computer-implemented method according to any one of the preceding claims 12-13, comprising the step: Forecasting (502) a power demand of the local power grid (2) and / or the higher-level power grid (4) based on the grid data, and Providing peak load power or control power depending on the forecast electricity demand so that the higher electricity demand is met.

15. Computer-implemented method according to one of the preceding claims 12-14, comprising the steps: Detecting a failure of the higher-level power grid (4), and providing emergency power to a sub-grid of the local power grid (2) or the local power grid (2) when the failure is detected.

16. Device for data processing, in particular a computing unit (20) according to claim 10, comprising means for carrying out the steps of the method according to one of the preceding claims 12-15.

17. A computer program product comprising instructions which, when the program is executed by a processor, cause the processor to carry out the steps of the method according to any one of the preceding claims 12-15.

18. A computer-readable data carrier on which the computer program product according to the preceding claim 17 is stored.

19. A data carrier signal that transmits the computer program product according to the preceding claim 17.

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