Energy supply system and method for operating an energy supply system

Abstract

The invention relates to an energy supply system (1) comprising a photovoltaic system (6) and a hybrid inverter (2), wherein: the hybrid inverter (2) comprises a photovoltaic-direct current interface (201) by means of which the hybrid inverter (2) is connected to the photovoltaic system (6); and the hybrid inverter (2) comprises a battery interface (202) for connection to an in particular stationary battery as the intermediate storage unit or storage unit of electrical energy generated by means of the photovoltaic system (6).

Description

[0001] Energy supply system and method for operating an energy supply system

[0002] The invention relates to an energy supply system with a photovoltaic system and a hybrid inverter, wherein the hybrid inverter comprises a photovoltaic direct current interface by means of which the hybrid inverter is connected to the photovoltaic system, wherein the hybrid inverter comprises a battery interface for connecting a battery, in particular a stationary battery, as an intermediate storage device or storage device for electrical energy generated by the photovoltaic system.

[0003] The number of electric vehicles is continuously increasing. These are being subsidized and are intended to replace vehicles with combustion engines in the medium term. The development of the charging infrastructure and the integration of charging stations pose a major challenge for electrical distribution grid operators. Electrical distribution grids are designed for expected peak loads. The connected consumer power must be considered, taking into account local distribution and simultaneity.

[0004] In addition to conventional household consumer loads, the load for charging electric vehicles is now also added. In the simplest case, the electric vehicle should be charged as quickly and completely as possible. However, since electric vehicles are stationary for most of the time – like other vehicles – it is possible to coordinate the charging of the vehicles in such a way that the peak load in the distribution grid does not increase or only increases slightly. The object of the invention is therefore to provide an alternative energy supply system.

[0005] This problem is solved by the features of the patent claims.

[0006] In one embodiment, a wired communication channel is provided between the hybrid inverter and the electric vehicle, starting from the energy supply system, wherein a communication adapter is integrated into the wired communication channel, which communication adapter is configured to variably convert a power line communication signal according to ISO 015118 to a bus signal of the hybrid inverter and vice versa.

[0007] For example, the communication adapter has at least two interfaces designed to convert bus signals from different bus systems to a power line communication signal according to ISO 015118 and vice versa. This means that the communication adapter is flexibly configured to convert different bus signals and can therefore be retrofitted to hybrid inverters of different types.

[0008] Another design involves connecting the hybrid inverter to a house connection box. This allows the energy from the electric vehicle's battery to be fed into the AC grid and also used directly to supply conventional household loads.

[0009] The communication adapter can be equipped with a display module. The display module can be used to configure settings on the communication adapter. It can also be used to display status information about the communication adapter or other components in the power supply system.

[0010] An electric vehicle within the meaning of this disclosure is, in particular, a motor vehicle with an electric drive. An electric vehicle within the meaning of this disclosure can be a purely electrically powered motor vehicle or a plug-in hybrid vehicle.

[0011] Power modules, such as a photovoltaic system or a hybrid inverter, are connected within the meaning of this disclosure if electrical energy is or can be transmitted between them.

[0012] A battery within the meaning of this disclosure is rechargeable, ie an accumulator.

[0013] A communication adapter within the meaning of this disclosure may be a signal converter.

[0014] In the following, exemplary embodiments of the invention are explained in more detail with reference to the drawings. They show:

[0015] Figure 1: schematically shows a block diagram of an energy supply system according to the invention;

[0016] Figure 2: schematically shows a block diagram of a communication adapter according to the invention.

[0017] Figure 1 shows an energy supply system 1 with a photovoltaic system 6 arranged on a roof 61 of a building 60 and a hybrid inverter 2, wherein the hybrid inverter 2 comprises a photovoltaic direct current interface 201, by means of which the hybrid inverter 2 is connected to the photovoltaic system 6 via an electrical connection 26. The hybrid inverter 2 comprises a (direct current) battery interface 202 for connecting a battery, in particular a stationary one, as an intermediate storage device or storage for electrical energy generated by the photovoltaic system 6.The hybrid inverter 2 is connected to a charging plug 4 by means of a cable 24, wherein the charging plug 4 is connected or connectable to the battery system 51 by means of the battery interface 202 and a charging cable 45 and thus to a battery 53 of the electric vehicle 5 via the battery controller 52 in such a way that electrical energy generated by means of the photovoltaic system 6 can be fed into the battery 53 of the electric vehicle 5 by means of the hybrid inverter 2.

[0018] The hybrid inverter 2 comprises an alternating current interface 203 for feeding electrical energy by means of a cable 23 into an alternating current grid 3, in particular of the building 60, and for feeding electrical energy from the alternating current grid 3, in particular of the building 60, by means of the hybrid inverter 2 into the battery 53 of the electric vehicle 5.

[0019] It is also provided that energy is transferred from the battery 53 of the electric vehicle 5 to the hybrid inverter 2, which then distributes it further.

[0020] The energy supply system also comprises a communication adapter?, by means of which data and / or information are exchanged or can be exchanged between the electric vehicle 5 and the hybrid inverter 2 via a communication interface 204 of the hybrid inverter 2.

[0021] The communication adapter 7 comprises a power line communications interface 11 for feeding data and / or information into the cable 24 that connects the hybrid inverter 2 to the charging plug 4, wherein the communication adapter 7 is configured such that a power line communications signal according to ISO 015118 can be variably converted to a bus signal of the hybrid inverter 2 and vice versa.

[0022] To establish communication between the hybrid inverter 2 and the electric vehicle 5, a communication adapter 7 is provided. This is connected to the hybrid inverter 2 via a data line 27 by means of a communication interface 204 or a first bus interface 9. Furthermore, the communication adapter 7 is connected to the electric vehicle 5 via a PLC interface 11 via a communication line 724, via which a power line communications (PLC) signal is transmitted. The charging connector 4 simply transmits both the electrical power and the PLC signal. The communication adapter 7 converts the bus signal of the hybrid inverter 2 into a PLC signal and vice versa. This enables communication between the electric vehicle 5 and the hybrid inverter 2.The described energy supply system enables bidirectional energy transmission between the hybrid inverter 2 and the electric vehicle 5 or its battery 53.

[0023] Figure 2 shows a block diagram of the communication adapter 7. The communication adapter 7 has a power supply 8 and two bus interfaces 9, 10, via which the communication adapter can be connected to the bus system of the hybrid inverter. Furthermore, the communication adapter 7 has a PLC interface 11, via which the communication adapter 7 can be communicatively connected to the electric vehicle 5.

[0024] The communication adapter 7 also has a display module 12. The display module can be used to display status information of the communication adapter 7 and other components of the power supply system 1. The communication adapter 7 also has a bus driver 13. The bus driver 13 can be used to switch the connected components on and off on the bus, to switch the desired transmission direction for bidirectional communication, and to amplify signals. The bus driver 13 can process signals from different bus protocols and convert them into a PLC signal and forward it to a PLC unit 14. The communication adapter 7 also has a voltage converter 15 and a radio interface 16, which is used for wireless communication, for example via Bluetooth or Wi-Fi. Finally, a microcontroller 17, which controls the components of the communication adapter 7, is arranged in the communication adapter.

[0025] The communication adapter 7 shown in Figure 2 can be retrofitted to a hybrid inverter 2, enabling communication and thus bidirectional power transmission between the hybrid inverter 2 and the electric vehicle 5. The communication adapter 7 has several bus interfaces, allowing it to flexibly convert signals from common bus systems used in battery inverters to a PLC signal according to ISO 015118. The common bus systems are primarily CAN bus, LIN bus, Ethernet, and Modbus.

[0026] List of reference symbols:

[0027] 1 Energy supply system 2 Hybrid inverters

[0028] 3 AC network

[0029] 4 charging plugs

[0030] 5 electric vehicle

[0031] 51 Battery system of 5 52 Electric vehicle battery control 5

[0032] 53 Electric vehicle battery 5

[0033] 6 photovoltaic system

[0034] 7 Communication module

[0035] 8 Power supply 9 First bus interface

[0036] 10 second bus interface 11 PLC interface

[0037] 12 Display module

[0038] 13 bus drivers

[0039] 14 PLC unit 15 Voltage converter

[0040] 16 radio interface

[0041] 17 microcontrollers

[0042] 23 cables

[0043] 24 Cable 26 electrical connection

[0044] 60 buildings

[0045] 61 roof

[0046] 201 Photovoltaic DC interface

[0047] 202 Battery interface 203 AC interface

[0048] 204 Communication interface

Claims

Claims Energy supply system (1) with a photovoltaic system (6) and a hybrid inverter (2), wherein the hybrid inverter (2) comprises a photovoltaic DC interface (201) by means of which the hybrid inverter (2) is connected to the photovoltaic system (6), wherein the hybrid inverter (2) comprises a battery interface (202) for connecting a battery, in particular a stationary battery, as an intermediate storage or storage of electrical energy generated by means of the photovoltaic system (6), wherein the hybrid inverter (2) is connected or connectable to the battery (53) of an electric vehicle (5) by means of the battery interface (202) or is connected to a charging plug (4) by means of a cable (24), wherein the charging plug (4) is connected or connectable to the battery (53) of the electric vehicle (5) by means of a charging cable (45) such that electrical energy can be supplied by means of the hybrid inverter (2),which is generated by means of the photovoltaic system (6) and can be fed into the battery (53) of the electric vehicle (5), wherein the hybrid inverter (2) comprises an AC interface (203) for feeding electrical energy into an AC network (3), in particular of a building (60), and for feeding electrical energy from the AC network (3), in particular of the building (60), into the battery (53) of the electric vehicle (5) by means of the hybrid inverter (2).

2. Energy supply system (1) according to claim 1, comprising a communication adapter (7) by means of which data and / or information are exchanged or can be exchanged between the electric vehicle (5) and the hybrid inverter (2) via a communication interface (204) of the hybrid inverter (2).

3. Energy supply system (1) according to claim 2, wherein the communication adapter (7) comprises a power line communications interface (11) for feeding data and / or information into the cable (24) that connects the hybrid inverter (2) to the charging plug (4).

4. Energy supply system (1) according to claim 3, wherein the communication adapter (7) is configured such that a power line communications signal according to ISO 015118 can be variably converted to a bus signal of the hybrid inverter (2) and vice versa.

5. Power supply system (1) according to one of claims 2 to 4, wherein the communication adapter (7) has a radio interface (16) for wireless communication.

6. Building (60) comprising a hybrid inverter (2), a photovoltaic system (6) and a charging plug (4) and forming part of a power supply system (1) according to one of the preceding claims.

7. Method for manufacturing an energy supply system (1) according to one of claims 1 to 5, wherein the photovoltaic system (6) is installed, in particular on the roof (61) of a building (60), wherein the hybrid inverter- The hybrid inverter (2) is installed in the building (60), wherein the photovoltaic system (6) and the hybrid inverter (2) are connected to each other in such a way that electrical energy generated by the photovoltaic system (6) can be fed into the hybrid inverter (2), wherein it is particularly provided that a charging plug (4) is then arranged on the building (60), wherein the hybrid inverter (2) is then connected to the charging plug (4) by means of the cable (24), and wherein it is particularly provided that (for example, afterwards) the communication adapter (7) is installed. The method according to claim 7, wherein the charging cable (45) is then plugged into the charging plug (4) for the transmission of electrical energy between the electric vehicle (5) and the plug (4).Method for operating an energy supply system (1 ) according to one of claims 1 to 5, characterized in that the charging cable (45) is plugged into the charging plug (4) for the transmission of electrical energy between the electric vehicle (5) and the charging plug (4), wherein electrical energy is transferred from the hybrid inverter (2) to the electric vehicle (5), and wherein electrical energy is subsequently transferred from the electric vehicle (5) to the hybrid inverter (2) and fed into the AC network (3).A communication adapter (7) for use in a power supply system (1) according to claim 2, 3, 4 or 5, wherein the communication adapter (7) is connectable to the hybrid inverter (2), wherein the communication adapter (7) has at least two, preferably at least four, bus interfaces (9, 10), and wherein the communication adapter (7) is also configured to convert bus signals from different bus systems to a power line communication signal according to ISO 015118 and vice versa. A communication adapter (7) according to claim 10, wherein the bus interfaces (9, 10) comprise a CAN bus, LIN bus, Ethernet and / or Modbus interface.

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