Method for operating an arrangement comprising a charging station and a motor vehicle, arrangement comprising a charging station and a motor vehicle and method for operating a motor vehicle and method for operating a charging station

Abstract

Method for operating an arrangement (1) comprising a charging station (2) for a motor vehicle (3) and a motor vehicle (3) electrically connected to the charging station (2) via a connection (11), wherein the charging station (2) has a mains connection (5) for supplying power from a power grid (6) and the motor vehicle (3) has an energy store (4) for temporarily storing electrical energy, characterized in that the charging station (2) has a charging station communication device (12) for communicating with a motor vehicle communication device (14) of the motor vehicle (3),and that if communication via the charging station communication device (12) fails, the energy storage device (4) is electrically connected to the connection (11) for providing electrical energy for the charging station (2) and the electrical energy provided by the motor vehicle (3) at the connection (11) is used to operate the charging station communication device (12).

Description

[0001] The invention relates to a method for operating an arrangement comprising a charging station for a motor vehicle and a motor vehicle electrically connected to the charging station via a connection, wherein the charging station has a mains connection for supplying power from a power grid and the motor vehicle has an energy storage device for temporarily storing electrical energy. The invention further relates to an arrangement comprising a charging station for a motor vehicle and a motor vehicle, as well as a method for operating a motor vehicle and a method for operating a charging station.

[0002] For example, the prior art document DE 10 2016 222 358 A1 is known. This document describes a method for energy transfer between a vehicle battery and a building, in which a fluid-carrying heat exchanger of an energy transfer device of the building is brought close to the vehicle battery and thermal energy is transferred between the vehicle battery and the fluid carried in the heat exchanger.

[0003] Furthermore, from the document DE 10 2017 106 338 A1 a method for starting an energy generation network is known, wherein the energy generation network is connected to an electrical supply network at at least one network connection point, and wherein the energy generation network exchanges electrical power with the electrical supply network via the network connection point in a normal operating mode.The method comprises the following steps: selecting a setup mode different from the normal operating mode when the electrical supply network has a voltage drop and / or the energy generation network is disconnected from the electrical supply network, and operating the energy generation network in the setup mode, wherein in the setup mode at least one voltage stamping means is provided and at least one primary supply means synchronizes with the energy generation network voltage provided by the voltage stamping means, and the voltage stamping means and the primary supply means in total provide an electrical power in the energy generation network in the amount of an internal demand of the energy generation network.

[0004] The document US 2014 / 0 225 441 A1 describes a power supply system with a vehicle and a power supply device for receiving power from the vehicle and supplying the received power to a load outside the vehicle. The vehicle comprises a power generation unit, a power supply unit for receiving power from the power generation unit and supplying the received power to the power supply device, a storage unit for storing an indication of the power supplied to the load from an external power supply, and a control device that controls the power supply unit to convert the power received by the power generation unit into power for driving the load based on the indication of the supplied power stored in the storage unit when the external power supply has failed.

[0005] Furthermore, the prior art documents WO 2014 / 199 203 A1, DE 10 2013 200 102 A1, US 2011 / 0 309 674 A1 and US 2011 / 0 202 192 A1 are known.

[0006] The object of the invention is to propose a method for operating an arrangement comprising a charging station and a motor vehicle, which has advantages over known methods, in particular enabling a black start of the charging station.

[0007] This is achieved with a method for operating an arrangement comprising a charging station and a motor vehicle having the features of claim 1. It is provided that the charging station has a charging station communication device for communicating with a motor vehicle communication device of the motor vehicle, and that if communication via the charging station communication device fails, the energy storage device for providing electrical energy for the charging station is electrically connected to the connection, and the electrical energy provided by the motor vehicle at the connection is used to operate the charging station communication device.

[0008] The charging station normally serves to provide electrical energy to the motor vehicle, in particular for charging the energy storage device. At least temporarily, electrical energy is supplied to the charging station from the power grid via the grid connection. The charging station draws electrical energy from the power grid via the grid connection and supplies it to the motor vehicle. The electrical energy is preferably used to charge the energy storage device.

[0009] The charging station is preferably a stationary charging station. For example, it comprises a charging column, a wall box, or the like. The power grid used is particularly preferably a residential building's electrical network, which in turn is electrically connected to a public power grid. The residential building is therefore provided with electricity from the public power grid at least temporarily. This electrical energy is in turn used, at least temporarily, to operate the charging station. The charging station is therefore only indirectly connected to the public power grid via the residential power grid, which can more generally be referred to as an intermediate power grid. The intermediate power grid can, in principle, be designed in any way; it does not have to be a residential power grid. Of course, the charging station can also be directly connected to the public power grid.

[0010] In the event of a power outage, however, no electrical energy can be supplied to the residential building from the public power grid, and accordingly, no electrical energy can be supplied to the charging station from the domestic power grid or the power grid. This also applies, of course, if the charging station is directly connected to the public power grid. The charging station is therefore without power. It would now be desirable to use the electrical energy temporarily stored in the vehicle's energy storage device to at least temporarily supply the power grid, in particular the domestic power grid or the public power grid, with electrical energy.

[0011] The electrical energy provided in this way can be used, for example, for a black start of the power grid or household power grid, for example, a power generation device connected to it. The power generation device could be a solar system, photovoltaic system, wind turbine, hydroelectric power plant, or the like. A black start is understood to mean starting up the power grid or the power generation device using externally provided energy, with the external energy being the electrical energy temporarily stored in the energy storage device.

[0012] Additionally or alternatively, it can be provided to use the electrical energy provided by the motor vehicle at the connection for a black start of the public power grid. For this purpose, it is particularly preferred to use the electrical energy provided by several motor vehicles. For this purpose, the motor vehicles can be linked to one another via communication technology so that they provide the energy in a coordinated manner. For example, the motor vehicles are controlled in such a way that they provide the energy simultaneously so that the public power grid is supplied with electrical energy via the respective household power grid in order to carry out the black start. In this context, for example, a power plant in the public power grid is started or ramped up.

[0013] However, since the charging station is without power due to the power outage, the charging station communication device is also out of service. This charging station communication device serves, when the charging station is operating as intended, to communicate with the motor vehicle communication device of the vehicle. During normal operation of the charging station, during which it is supplied with electrical power via the mains connection, communication with the motor vehicle communication device is initially established via the charging station communication device, so that a permanent communication connection subsequently exists between the charging station communication device and the motor vehicle communication device.

[0014] The charging station uses the communication connection to inform the motor vehicle that electrical energy will subsequently be supplied to the motor vehicle from the charging station or drawn from the charging station. This occurs in each case via the motor vehicle's electrical connection to the charging station. The connection can be, for example, a wired connection or a wireless connection. In the former case, the connection has a plug-in connector or is designed as one.

[0015] In the event of a power failure, the communication connection cannot initially be established because the charging station communication device is not supplied with electrical power. For this reason, if communication via the charging station communication device fails, the energy storage device is electrically connected to the connection. Therefore, as soon as the motor vehicle detects that there is no communication between the charging station communication device and the vehicle communication device, it is assumed that the charging station communication device is not sufficiently supplied with electrical power.

[0016] Accordingly, measures are initiated to ensure the operation of the charging station communication device with electrical energy taken from the vehicle's energy storage unit. For this purpose, the electrical connection between the energy storage unit and the charging station, and thus the charging station communication device, is established via the connector.

[0017] Subsequently, the electrical energy provided by the motor vehicle at the connection is used to operate the charging station communication device. In particular, communication is established between the charging station communication device and the motor vehicle communication device, and for this purpose, the communication connection between them is established. Subsequently, it is preferably provided that the charging station transmits at least one power supply parameter to the motor vehicle via the communication connection, and the motor vehicle provides the electrical energy from the energy storage device to the charging station in accordance with this power supply parameter. The power supply parameter can be, for example, an electrical voltage or the like.

[0018] For example, it is provided that if communication via the charging station communication device fails, the motor vehicle initially makes electrical energy available to the charging station at a preset first voltage. This first voltage is selected such that the charging station communication device can be operated as intended. After the charging station communication device has been commissioned with the electrical energy drawn from the energy storage device, the charging station communicates a second voltage in the form of the power supply parameter to the motor vehicle, which second voltage can be or is different from the first voltage. This second voltage is selected by the charging station in particular such that the power grid or at least one consumer connected to it and / or a power generation device connected to it can be operated as intended.In particular, the second voltage is higher than the first voltage. Preferably, the first voltage is a low voltage, in particular a safety extra-low voltage, to avoid any hazards caused by the provision of electrical energy.

[0019] The described procedure has the advantage that, even in the event of a power failure, a black start of the charging station can be performed using the electrical energy available in the motor vehicle's energy storage device. This subsequently enables a black start of the power grid, in particular a black start of at least one consumer connected to the power grid and / or at least one power generation device connected to the power grid.

[0020] For example, it is provided that an electrical switch, in particular a contactor, is present between the public power grid and the household power grid. In a first switching state of the switch, the household power grid is electrically connected to the public power grid, whereas in a second switching state it is electrically decoupled from the public power grid. Preferably, it is provided that the electrical energy provided by the motor vehicle at the connection is used not only to operate the charging station communication device, but also to actuate the switch, in particular to switch the switch from the first switching state to the second switching state, so that the household power grid is subsequently electrically decoupled from the public power grid and can be operated independently.

[0021] A further development of the invention provides that the electrical energy is provided in the form of direct current. Accordingly, the energy storage device is preferably a direct current energy storage device. This allows for the provision of electrical energy to the connection and, via this, to the charging station in a particularly simple manner.

[0022] A further development of the invention provides that, to provide the electrical energy, a switch electrically arranged between the connection and the energy storage device is closed, or a DC-DC converter arranged between the connection and the energy storage device is operated to provide a desired voltage at the connection. It can be provided that the energy storage device is electrically connected directly to the connection via the switch. When the switch is closed, the same electrical voltage is applied to the connection as to the energy storage device. When the switch is open, however, the electrical connection between the connection and the energy storage device is interrupted.

[0023] Additionally or alternatively, the DC-DC converter is operated to provide the target voltage at the terminal. The DC-DC converter can be present as an alternative to the switch or, for example, can be electrically connected in parallel with it. The DC-DC converter serves at least to convert the voltage applied to the energy storage device into the target voltage that is present or should be present at the terminal.

[0024] Of course, the DC-DC converter can also be designed bidirectionally. In this case, it can be operated either during charging of the energy storage device using electrical energy provided by the charging station to convert the voltage present at the connection into the voltage required by the energy storage device, or conversely, to convert the voltage provided by the energy storage device into the target voltage. In either case, a flexible and reliable supply of electrical energy to the charging station communication device is ensured in the event of a power failure.

[0025] A further development of the invention provides that the provision of electrical energy is initiated as soon as a specific period of time has elapsed after the motor vehicle has been connected to the charging station without communication via the charging station communication device, or as soon as an operating device of the motor vehicle is operated by a user. The motor vehicle detects the connection of the motor vehicle to the charging station and records the time at which this connection occurs. If the specific period of time has elapsed since this time, it is assumed that the charging station is de-energized, and the provision of electrical energy is initiated.

[0026] Alternatively or additionally, the power can be provided as soon as the operating device is activated by the user. The operating device can be, for example, a switch, a button, or the like. The operating device can be dedicated or in the form of a control element of a graphical user interface. The described procedure ensures that electrical energy is reliably supplied to the charging station from the energy storage device only when it is actually necessary.

[0027] A further development of the invention provides that the provision of electrical energy is discontinued as soon as the current flowing between the energy storage device and the connection and / or the electrical power of the electrical current provided via the connection exceeds a certain limit. Accordingly, the current flowing between the energy storage device and the connection is measured.

[0028] If the current exceeds the limit, the supply of electrical energy is interrupted for safety reasons, in particular by opening the switch and / or by operating the DC-DC converter accordingly. The same applies if the electrical power exceeds the limit. This prevents the electrical energy from being supplied to an unsuitable counterpart, such as a defective charging station or the like.

[0029] A further development of the invention provides that the provision of electrical energy is interrupted as soon as a certain period of time has elapsed from the start of the provision without communication being established by the charging station communication device. From the moment the electrical energy is provided, the communication is monitored, in particular by appropriately operating the motor vehicle communication device. If communication or the communication connection is not established by the charging station communication connection, an unsuitable charging station or a defect in the charging station is detected. Accordingly, the provision of electrical energy is interrupted, again in particular by opening the switch or by appropriately operating the DC-DC converter.

[0030] A further development of the invention provides that the provided electrical energy is used to operate an inverter of the charging station in order to make the electrical energy available to the power grid in the form of alternating current. As already explained above, the described method is not, or at least not necessarily, used exclusively for a black start of the charging station. Rather, a black start of the power grid is at least partially or even completely feasible. This provides a particularly significant benefit for a motor vehicle user.

[0031] The invention further relates to an arrangement comprising a charging station for a motor vehicle and a motor vehicle electrically connected to the charging station via a connection, in particular for carrying out the method according to the explanations in the context of this description, wherein the charging station has a mains connection for supplying power from a power grid and the motor vehicle has an energy store for temporarily storing electrical energy.

[0032] It is provided that the charging station has a charging station communication device for communicating with a motor vehicle communication device of the motor vehicle, and that the charging station is provided and designed to electrically connect the energy storage device to the connection in the event of a lack of communication via the charging station communication device for providing electrical energy for the charging station and to use the electrical energy provided by the motor vehicle at the connection to operate the charging station communication device.

[0033] The advantages of such an approach or such a design of the arrangement have already been discussed. Both the arrangement and the method for its operation can be further developed according to the explanations in this description, so reference is made to these in this regard.

[0034] Furthermore, the invention relates to a method for operating a motor vehicle electrically connected to a charging station via a connection, in particular for carrying out the method according to the explanations within the scope of this description, wherein the motor vehicle has an energy storage device for temporarily storing electrical energy. It is provided that the motor vehicle has a motor vehicle communication device for communicating with a charging station communication device of the charging station, and that if communication via the charging station communication device of the charging station fails, the energy storage device is connected to the connection to provide electrical energy to the charging station.

[0035] The invention further relates to a method for operating a charging station electrically connected to a motor vehicle via a connection, in particular for carrying out the method according to the explanations within the scope of this description, wherein the charging station has a mains connection for power supply from a power grid. It is provided that the charging station has a charging station communication device for communication with a motor vehicle communication device of the motor vehicle, and that if the power supply via the mains connection is insufficient for proper operation of the charging station, electrical energy provided by the motor vehicle at the connection is used to operate the charging station communication device.

[0036] With regard to both the method for operating the motor vehicle and the method for operating the charging station, reference is made to the explanations within this description with regard to the advantages and possible further developments. Naturally, the invention also relates to a motor vehicle for implementing the operating method for the motor vehicle and a charging station for implementing the operating method for the charging station.

[0037] The invention will be explained in more detail below with reference to the exemplary embodiments shown in the drawings, without limiting the invention. In the drawings: Fig. 1 a schematic representation of an arrangement of a charging station for a motor vehicle and the motor vehicle as well as a building, Fig. 2 a schematic representation of the arrangement of the charging station and the motor vehicle in a first embodiment, and Fig. 3 a schematic representation of the arrangement of the charging station and the motor vehicle in a second embodiment.

[0038] The Fig. 1 shows a schematic representation of an arrangement 1 comprising a charging station 2 and a motor vehicle 3, wherein the charging station 2 is provided and designed to charge an energy storage device 4 (not shown here) of the motor vehicle 3. The energy required to charge the energy storage device 4 is made available to the charging station 2 during normal operation via a grid connection 5 from a power grid 6. In the embodiment shown here, the power grid 6 is a domestic power grid and is electrically connected to a public power grid 7 away from the charging station 2. The power grid 6 contains, for example, a power generation device 8, in particular a photovoltaic device. In addition, the power grid 6 has a plurality of power consumers 9, which are only indicated here.

[0039] In the event of a power outage in the public power grid 7, the power grid 6 is no longer supplied with electrical power. Accordingly, the charging station 2 cannot be supplied with electrical energy to charge the energy storage device 4. In this case, in emergency operation, the charging station 2 is supplied with electrical energy from the energy storage device 4, thus enabling a black start of the charging station 2. The electrical energy temporarily stored in the energy storage device 4 of the motor vehicle 3 can then be used to operate the power grid 6, in particular to perform a black start of the power generation device 8.

[0040] The Fig. Figure 2 shows the arrangement 1 comprising a charging station 2 and a motor vehicle 3 in a first embodiment. The charging station 2 has an AC / DC converter 10, which is electrically connected on one side to the mains connection 5 and on the other side to a connection 11. Furthermore, the charging station 2 has a charging station communication device 12. The motor vehicle 3 has the energy storage device 4, a DC / DC converter 13, and a motor vehicle communication device 14. The energy storage device 4 is connected to the connection 11 via the DC / DC converter 13. The charging station 2 and the motor vehicle 3 are electrically connected to one another via the connection 11. The connection 11 can, for example, be in the form of a plug connection or the like.

[0041] In the event of a power failure in the power grid 6 and / or the power grid 7, the charging station communication device 12 is initially out of operation. In this case, an emergency operation of the arrangement 1 is carried out. In this emergency operation, the DC / DC converter 13 is operated in such a way that the connection 11 is supplied with electrical energy from the energy storage device 4, thus making the electrical energy available to the charging station 2. The provided electrical energy is used by the charging station 2 to operate the charging station communication device 12 and to establish a communication connection between the charging station communication device 12 and the motor vehicle communication device 14.

[0042] After establishing communication between the charging station communication device 12 and the motor vehicle communication device 14, the AC / DC converter 10 and the DC / DC converter 13 are preferably controlled such that electrical energy from the energy storage device 4 is made available to the power grid 6 via the grid connection 5. For example, a black start of the power generation device 8 is performed using the provided electrical energy.

[0043] The Fig.Figure 3 shows a schematic representation of the arrangement 1 in a second embodiment. The second embodiment differs only slightly from the first embodiment, so reference is made to the above explanations and only the differences will be discussed below. These differences lie in the fact that, instead of the DC / DC converter 13, a switch 15 is electrically connected between the energy storage device 4 and the terminal 11. In a first switching position, this switch interrupts the electrical connection between the energy storage device 4 and the terminal 11 and establishes it in a second switching position. However, for safety reasons, the first embodiment is preferable.

[0044] The described configuration of arrangement 1 and the described procedure enable the charging station 2 to be easily started up exclusively with electrical energy provided by the motor vehicle 3 from the energy storage device 4. A black start of the charging station 2 is thus possible, as a result of which communication is established between the charging station 2 and the motor vehicle 3 via the charging station communication device 12 and the motor vehicle communication device 14. The motor vehicle 3 can then be controlled via the communication in such a way that the energy provided from the energy storage device 4 can subsequently be used to operate the power grid 6. LIST OF REFERENCE SYMBOLS: 1 arrangement 2 charging stations 3 Motor vehicle 4 energy storage 5 Mains connection 6 Power grid 7 Power grid 8 Power generation facility 9 electricity consumers 10 AC / DC converters 11 Connection 12 Charging station communication device 13 DC / DC converters 14 Motor vehicle communication device 15 switches

Claims

[1] Method for operating an arrangement (1) comprising a charging station (2) for a motor vehicle (3) and a motor vehicle (3) electrically connected to the charging station (2) via a connection (11), wherein the charging station (2) has a mains connection (5) for supplying power from a power grid (6) and the motor vehicle (3) has an energy store (4) for temporarily storing electrical energy, characterized bythat the charging station (2) has a charging station communication device (12) for communicating with a motor vehicle communication device (14) of the motor vehicle (3), and that if communication via the charging station communication device (12) fails, the energy store (4) for providing electrical energy for the charging station (2) is electrically connected to the connection (11) and the electrical energy provided by the motor vehicle (3) at the connection (11) is used to operate the charging station communication device (12). [2] Method according to claim 1, characterized by that the electrical energy is provided in the form of direct current. [3] Method according to one of the preceding claims, characterized byin that, in order to provide the electrical energy, a switch (15) arranged electrically between the terminal (11) and the energy store (4) is closed or a DC-DC converter (13) arranged electrically between the terminal (11) and the energy store (4) is operated to provide a desired voltage at the terminal (11). [4] Method according to one of the preceding claims, characterized by that the provision of electrical energy is initiated as soon as a certain period of time has elapsed after the motor vehicle (3) has been connected to the charging station (2) without communication by the charging station communication device (12), or as soon as an operating device of the motor vehicle (3) is actuated by a user. [5] Method according to one of the preceding claims, characterized bythat the provision of electrical energy is interrupted as soon as a current intensity of a current flowing between the energy store (4) and the terminal (11) and / or an electrical power of the electrical current provided via the terminal (11) exceeds a certain limit value. [6] Method according to one of the preceding claims, characterized by that the provision of electrical energy is interrupted as soon as a certain time period has elapsed from the start of the provision without the establishment of communication by the charging station communication device (12). [7] Method according to one of the preceding claims, characterized by that the provided electrical energy is used to operate an inverter (10) of the charging station (2) in order to make the electrical energy available to the power grid (6) in the form of alternating current. [8] Arrangement (1) comprising a charging station (2) for a motor vehicle (3) and a motor vehicle (3) electrically connected to the charging station (2) via a connection (11), in particular for carrying out the method according to one or more of the preceding claims, wherein the charging station (2) has a mains connection (5) for supplying power from a power grid (6) and the motor vehicle (3) has an energy store (4) for temporarily storing electrical energy, characterized bythat the charging station (2) has a charging station communication device (12) for communicating with a motor vehicle communication device (14) of the motor vehicle (3), and that the arrangement (1) is provided and designed to electrically connect the energy store (4) to the connection (11) for providing electrical energy for the charging station (2) in the event of a lack of communication by the charging station communication device (12) and to use the electrical energy provided by the motor vehicle (3) at the connection (11) to operate the charging station communication device (12). [9] Method for operating a motor vehicle (3) electrically connected to a charging station (2) via a connection (11), in particular for carrying out the method according to one or more of claims 1 to 7, wherein the motor vehicle (3) has an energy storage device (4) for temporarily storing electrical energy, characterized bythat the motor vehicle (3) has a motor vehicle communication device (14) for communicating with a charging station communication device (12) of the charging station (2), and that if communication by the charging station communication device (12) of the charging station (2) fails, the energy store (4) is electrically connected to the connection (11) for providing electrical energy for the charging station (2). [10] Method for operating a charging station (2) electrically connected to a motor vehicle (3) via a connection (11), in particular for carrying out the method according to one or more of claims 1 to 7, wherein the charging station (2) has a mains connection (5) for supplying power from a power grid (6), characterized bythat the charging station (2) has a charging station communication device (12) for communication with a motor vehicle communication device (14) of the motor vehicle (3), and that if the power supply via the mains connection (5) is not sufficient for the intended operation of the charging station (2), electrical energy provided by the motor vehicle (3) at the connection (11) is used to operate the charging station communication device (12).

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