Optical storage and charging system, control method and controller thereof

Abstract

Embodiments of the present application provide a light storage charging system and a control method and a controller thereof. The light storage charging system comprises a charging device, an energy storage module, a photovoltaic module and a power converter. The charging device comprises a first bidirectional DC conversion module. The first bidirectional DC conversion module is used to be connected between the energy storage module and the power converter, or the first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter. The first bidirectional DC conversion module is also used to be connected to an electric vehicle. The power converter is used to be connected to the energy storage module, the photovoltaic module and an alternating current network respectively. The power converter is also used to be communicatively connected to the charging device. The power converter is used to control energy scheduling among the charging device, the energy storage module, the photovoltaic module and the alternating current network. The charging device, the energy storage module and the power converter are installed in a split type. The embodiments of the present application break through the household power limit of the power grid side, and have a small installation location limit and high installation flexibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light storage and charging systems, and particularly relates to a light storage and charging system and a control method and controller thereof. BACKGROUND

[0002] With the rapid development of new energy vehicles and distributed photovoltaics, the integration of photovoltaic modules, energy storage modules and electric vehicles has gradually become a trend. Related light storage and charging systems are either limited by the household power of the power grid or have limited installation locations and poor installation flexibility, which limits the application scenarios of the light storage and charging system. SUMMARY

[0003] The purpose of the present application is to provide a light storage and charging system and a control method and controller thereof, which break through the household power limit of the power grid and have limited installation locations and high installation flexibility.

[0004] The purpose of the present application is achieved by adopting the following technical solutions:

[0005] In a first aspect, the present application provides a light storage and charging system, which comprises a charging device, an energy storage module, a photovoltaic module and a power converter; the charging device comprises a first bidirectional DC conversion module; the first bidirectional DC conversion module is used to be connected between the energy storage module and the power converter, or the first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter; the first bidirectional DC conversion module is also used to be connected to an electric vehicle; the energy storage module is used to store electric energy; the photovoltaic module is used to collect solar energy and convert it into electric energy; the power converter is used to be connected to the energy storage module, the photovoltaic module and an alternating current network respectively, and the power converter is also used to be in communication connection with the charging device, and the power converter is used to control the energy scheduling between the charging device, the energy storage module, the photovoltaic module and the alternating current network; wherein the charging device, the energy storage module and the power converter are installed in a split type, and the electric vehicle comprises an electric vehicle and / or an electric bicycle.

[0006] In some embodiments, the first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter; the power converter comprises an inverter circuit, a DC bus and a second bidirectional DC conversion module, the alternating current side of the inverter circuit is used to be connected to the alternating current network, the direct current side of the inverter circuit is used to be connected to the DC bus, the DC bus is also used to be connected to the energy storage module, and the DC bus is also used to be connected to the photovoltaic module through the second bidirectional DC conversion module.

[0007] In some embodiments, the first bidirectional DC conversion module is configured to be connected between the energy storage module and the power converter; the power converter comprises an inverter circuit, a DC bus and a boost-buck module, an AC side of the inverter circuit is configured to be connected to the AC network, a DC side of the inverter circuit is configured to be connected to the DC bus, the DC bus is further configured to be connected to the energy storage module, and the DC bus is further configured to be connected to the photovoltaic module through the boost-buck module.

[0008] In some embodiments, the charging device further comprises a first current detection unit and an arc detection control unit; the first current detection unit is configured to detect a first current between the charging device and the electric vehicle, and provide a detected first current signal to the arc detection control unit; the arc detection control unit is configured to perform corresponding arc extinguishing protection operation when the received first current signal indicates that an arc fault occurs.

[0009] In some embodiments, the charging device further comprises a first breaking device connected between the first bidirectional DC conversion module and the electric vehicle; the arc detection control unit is configured to control the first breaking device to be disconnected to disconnect the electrical connection between the first bidirectional DC conversion module and the electric vehicle when the received first current signal indicates that an arc fault occurs.

[0010] In some embodiments, the charging device further comprises a second current detection unit and an arc detection control unit; the second current detection unit is configured to detect a second current between the charging device and the power converter, and provide a detected second current signal to the arc detection control unit; the arc detection control unit is configured to perform corresponding arc extinguishing protection operation when the received second current signal indicates that an arc fault occurs.

[0011] In some embodiments, the charging device further comprises a second disconnecting device connected between the first bidirectional DC conversion module and the power converter; the power converter comprises a DC bus, an inverter circuit and a third disconnecting device, the DC bus is configured to be connected to the energy storage module, the photovoltaic module and a DC side of the inverter circuit respectively, an AC side of the inverter circuit is configured to be connected to the AC network through the third disconnecting device; the arc detection control unit is configured to control the second disconnecting device to be disconnected to disconnect the electrical connection between the first bidirectional DC conversion module and the power converter, and send arc fault information to the power converter, in the case that the received second current signal indicates that an arc fault occurs; the power converter is configured to control the third disconnecting device to be disconnected to disconnect the electrical connection between the inverter circuit and the AC network, and / or stop outputting a switch driving signal to the inverter circuit, in response to the arc fault information.

[0012] In some embodiments, the first bidirectional DC conversion module is configured to transmit the electrical energy provided by at least one of the energy storage module, the photovoltaic module and the AC network to the electric vehicle, and transmit the electrical energy provided by the electric vehicle to the AC network and / or a load.

[0013] In some embodiments, a serial communication connection and / or a controller area network communication connection is adopted between the power converter and the charging device.

[0014] In the second aspect, the embodiments of the present application provide a control method of a light storage and charging system, the light storage and charging system comprising a charging device, an energy storage module, a photovoltaic module and a power converter; the charging device comprises a first bidirectional DC conversion module; the first bidirectional DC conversion module is configured to be connected between the energy storage module and the power converter, or the first bidirectional DC conversion module is configured to be connected between the photovoltaic module and the power converter; the first bidirectional DC conversion module is further configured to be connected to an electric vehicle; the energy storage module is configured to store electrical energy; the photovoltaic module is configured to collect solar energy and convert the solar energy into electrical energy; the power converter is configured to be connected to the energy storage module, the photovoltaic module and an AC network respectively, the power converter is further configured to be in communication connection with the charging device, and the power converter is configured to control the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the AC network; the method comprises: controlling the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the AC network by the power converter; wherein the charging device, the energy storage module and the power converter are in a split installation mode, and the electric vehicle comprises an electric vehicle and / or an electric bicycle.

[0015] In some embodiments, the controlling, by the power converter, the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the alternating current network comprises: performing, by the power converter, the following process: determining a target voltage and / or a target current of the charging device in response to a charging and discharging working condition of the charging device; generating a scheduling instruction based on the target voltage and / or the target current, and providing the scheduling instruction to the charging device; and wherein the charging device is configured to adjust an output voltage and / or an output current of the first bidirectional direct current conversion module in response to the scheduling instruction, so that the output voltage and / or the output current of the charging device is equal to the target voltage and / or the target current.

[0016] In a third aspect, the embodiments of the present application provide a controller configured to perform any of the above methods.

[0017] The embodiments of the present application provide a photovoltaic energy storage and charging system and a control method and a controller thereof. The photovoltaic energy storage and charging system comprises a charging device, an energy storage module, a photovoltaic module and a power converter. The charging device comprises a first bidirectional direct current conversion module. The first bidirectional direct current conversion module is configured to be connected between the energy storage module and the power converter, or the first bidirectional direct current conversion module is configured to be connected between the photovoltaic module and the power converter. The first bidirectional direct current conversion module is further configured to be connected to an electric vehicle. The energy storage module is configured to store electric energy. The photovoltaic module is configured to collect solar energy and convert the solar energy into electric energy. The power converter is configured to be connected to the energy storage module, the photovoltaic module and an alternating current network respectively. The power converter is further configured to be communicatively connected to the charging device. The power converter is configured to control the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the alternating current network. The charging device, the energy storage module and the power converter are configured to be installed in a split type. The electric vehicle comprises an electric car and / or an electric bicycle.

[0018] In the embodiments of the present application, the first bidirectional direct current conversion module of the charging device is directly coupled to the photovoltaic module or the energy storage module. The electric energy is directly supplied between the photovoltaic module side or the energy storage module side and the charging device in a direct current mode, without passing through a power grid home branch. This structure enables the charging device to directly obtain the direct current electric energy from the photovoltaic module side or the energy storage module side, bypassing the limitation of having to pass through the alternating current power grid home branch, thereby realizing direct current direct supply that bypasses the power grid side home power constraint. Therefore, the available power of the charging device is no longer limited by the power grid side home capacity, thereby effectively breaking through the power grid side home power limitation.

[0019] Secondly, the charging device, the energy storage module and the power converter in the light storage and charging system are installed in a split type. The charging device, the energy storage module and the power converter are separately arranged, which has low land occupation requirement and small installation location limitation, so that the light storage and charging system has the advantages of high installation flexibility, no installation location limitation, unlimited number of charging devices and unlimited application scenarios, and can meet the installation requirements in various scenarios, including household scenarios and industrial and commercial scenarios.

[0020] Thirdly, the light storage and charging system has the advantages of strong expansibility and low modification cost. Since the direct current bus in the power converter does not need to be modified, the modification difficulty and cost can be reduced.

[0021] In addition, the light storage and charging system can also improve the energy utilization efficiency. Since the charging device is directly coupled to the photovoltaic module or the energy storage module through the first bidirectional direct current module, the energy provided by the photovoltaic module or the energy storage module can be directly utilized, and the intermediate link of "photovoltaic module or energy storage module → direct current bus → power converter scheduling → charging device power taking" is reduced, so that the energy conversion loss can be reduced, and higher direct current charging efficiency can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in combination with the drawings and specific embodiments.

[0023] Figure 1 is a structural block diagram of a light storage and charging system provided by an embodiment of the present application.

[0024] Figure 2 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application.

[0025] Figure 3 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application.

[0026] Figure 4 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application.

[0027] Figure 5 is a structural block diagram of a charging device provided by an embodiment of the present application.

[0028] Figure 6 is a structural block diagram of another charging device provided by an embodiment of the present application.

[0029] Figure 7 is a structural schematic diagram of a light storage and charging system provided by an embodiment of the present application.

[0030] Figure 8 is a schematic diagram of a green electricity fast charging mode provided by an embodiment of the present application.

[0031] Figure 9is a schematic diagram of an ultra-fast charging mode provided by an embodiment of the present application.

[0032] Figure 10 is a schematic diagram of a V2X mode provided by an embodiment of the present application.

[0033] Figure 11 is a schematic diagram of a structure of a light storage and charging system provided by an embodiment of the present application.

[0034] Figure 12 is a schematic diagram of a structure of another light storage and charging system provided by an embodiment of the present application.

[0035] Figure 13 is a schematic diagram of a structure of yet another light storage and charging system provided by an embodiment of the present application.

[0036] Figure 14 is a flowchart of a control method of a light storage and charging system provided by an embodiment of the present application.

[0037] Figure 15 is a block diagram of a structure of a controller provided by an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] In the description of the embodiments of the present application, it should be understood that the terms “first” and “second” are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0040] With the rapid development of new energy vehicles and distributed photovoltaics, the integration and application of photovoltaic modules, energy storage modules and electric vehicles have gradually become a trend. Related light storage and charging systems adopt an AC coupling mode, i.e., photovoltaic modules and energy storage modules are connected to an AC power grid through a power converter (e.g., an inverter), and a charging device obtains power from the grid side to charge electric vehicles. Although this mode has a relatively mature structure, the light storage and charging system with AC coupling is limited by the household power of the grid side, resulting in limited maximum charging power of the charging device, which is difficult to meet the high-power charging demand in the home fast charging or commercial scenarios.

[0041] Part of the enterprise proposed direct current coupling solution adopts integrated design, integrates power converter, energy storage module and charging device in the same body, and then couples the charging device with the direct current bus. This design causes the charging device position to be strongly bound with the energy storage module, the installation position is limited, and the flexibility is poor. Especially in industrial and commercial high-power scenarios, the energy storage module has relatively high land requirement, and the bulky energy storage module and the charging device are difficult to be deployed in the same position, which limits the application scenarios of the light storage and charging system.

[0042] Referring to Figure 1 and Figure 2 , Figure 1 is a structural block diagram of a light storage and charging system provided by an embodiment of the present application, Figure 2 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application.

[0043] In order to improve the related art, an embodiment of the present application provides a light storage and charging system, which comprises a charging device, an energy storage module, a photovoltaic module and a power converter.

[0044] The charging device comprises a first bidirectional direct current conversion module. The first bidirectional direct current conversion module is used to be connected between the energy storage module and the power converter, as shown in Figure 1 Alternatively, the first bidirectional direct current conversion module is used to be connected between the photovoltaic module and the power converter, as shown in Figure 2 The first bidirectional direct current conversion module is also used to be connected to an electric vehicle.

[0045] The energy storage module is used to store electric energy.

[0046] The photovoltaic module is used to collect solar energy and convert it into electric energy.

[0047] The power converter is used to be connected to the energy storage module, the photovoltaic module and an alternating current network respectively, and is also used to be in communication connection with the charging device. The power converter is used to control the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the alternating current network.

[0048] Among them, the charging device, the energy storage module and the power converter are arranged in a split type installation mode. The electric vehicle comprises an electric vehicle and / or an electric bicycle.

[0049] As mentioned above, in some embodiments, the first bidirectional DC conversion module is configured to be connected between the energy storage module and the power converter. Alternatively, in some other embodiments, the first bidirectional DC conversion module is configured to be connected between the photovoltaic module and the power converter. That is, unlike the related art, the charging device in the above-mentioned photovoltaic energy storage and charging system is not directly coupled to the DC bus in DC, but is coupled to the energy storage module in DC through the first bidirectional DC conversion module, or is coupled to the photovoltaic module in DC through the first bidirectional DC conversion module.

[0050] In some embodiments, the AC grid to which the power converter is connected is not limited to a single form. The above-mentioned embodiments do not limit the AC grid, which can be, for example, an AC power grid, a microgrid, an industrial and commercial power distribution network, etc. Among them, the AC power grid can be a municipal power grid provided by a public power company; the microgrid can be a regional power grid with independent operation capability, suitable for parks, communities or remote areas; the industrial and commercial power distribution network can be used for energy distribution in high-power scenarios such as factories and parks.

[0051] The above-mentioned photovoltaic energy storage and charging system allows bidirectional flow of energy, for example, the charging and discharging functions of electric vehicles can be realized through the charging device.

[0052] In some embodiments, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by at least one of the energy storage module, the photovoltaic module and the AC grid to the electric vehicle. As an example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the energy storage module to the electric vehicle. As another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the photovoltaic module to the electric vehicle. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the AC grid to the electric vehicle. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the energy storage module and the photovoltaic module to the electric vehicle. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the energy storage module and the AC grid to the electric vehicle. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the photovoltaic module and the AC grid to the electric vehicle. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the energy storage module, the photovoltaic module and the AC grid to the electric vehicle.

[0053] In other embodiments, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the electric vehicle to the AC network and / or the load. As an example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the electric vehicle to the AC network. As another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the electric vehicle to the load. As yet another example, the first bidirectional DC conversion module can be configured to transmit the electrical energy provided by the electric vehicle to the AC network and the load.

[0054] The light storage charging system, for example, refers to a comprehensive energy exchange system integrating the functions of a photovoltaic module (light), an energy storage module (storage), and a charging device (charging), and can realize grid-connected operation and off-grid operation of the photovoltaic module, charging and discharging of the energy storage module, and direct current charging of an electric vehicle. Through the power converter, the energy flow of each part is coordinated, and efficient use of green energy and flexible scheduling of multiple ports can be achieved.

[0055] The photovoltaic module, for example, can include a photovoltaic assembly and its bus, a control device, and the like, and is configured to convert solar energy into direct current electrical energy.

[0056] The energy storage module, for example, can include one or more energy storage batteries and support electrical energy storage and release. As an example, the energy storage module can be charged when the photovoltaic module generates excess electricity or the power grid has a low electricity demand, and can be discharged when the load or the electric vehicle needs electricity or the power grid has a high electricity demand.

[0057] The charging device, by communicating with the power converter, receives energy distribution instructions, and transmits electrical energy from the energy storage module, the photovoltaic module, or the AC network to the electric vehicle in the form of appropriate voltage and current. The charging device is provided with a first bidirectional DC conversion module, also referred to as a first bidirectional DC / DC module, which supports bidirectional flow of direct current. The full name of DC is Direct Current.

[0058] The electric vehicle, for example, can serve as an electrical terminal and can obtain energy through a direct current charging mode. As an example, the electric vehicle can include an electric vehicle. As another example, the electric vehicle can include an electric bicycle. As yet another example, the electric vehicle can include an electric vehicle and an electric bicycle. In some embodiments, the electric vehicle can support a V2G (Vehicle-to-Grid) mode and provide on-board battery electrical energy to the AC network or the load.

[0059] The power converter can serve as an electrical energy conversion and scheduling device, for example, can have bidirectional AC / DC conversion capability, be connected to the energy storage module, the photovoltaic module and the AC network respectively, and communicate with the charging device. The power converter can also be connected to the load for power supply. As an example, the power converter can adopt a power conversion system (PCS). As another example, the power converter can adopt an inverter.

[0060] In some embodiments, the load connected by the power converter is not limited to a single type, which can be, for example, household electrical equipment, commercial and industrial electrical equipment, public facility electrical equipment, etc. Among them, the household electrical equipment can include lighting devices, household appliances, air conditioners, electric heaters, etc.; the commercial and industrial electrical equipment can include machine tools, motors, cooling systems, building power supply systems, etc.; the public facility electrical equipment can include road lighting systems, signal control systems, charging infrastructure, etc. As an example, the load connected by the power converter can include an ESP load (Emergency Supply Power load), i.e., a load powered by the system when operating off-grid, such as lighting devices, communication devices, UPS (Uninterruptible Power Supply) power supply ends, etc.

[0061] The power converter is used to control the energy scheduling between the charging device, the energy storage module, the photovoltaic module and the AC network, for example, refers to the coordination and control of the energy flow between multiple ports such as the photovoltaic module, the energy storage module, the charging device, the AC network, etc. As an example, the power converter can monitor the voltage and current of each port in real time, combine the power demand and the state of the energy storage module and the photovoltaic module, and dynamically allocate the energy flow direction.

[0062] The charging device, for example, refers to a terminal device that provides electrical energy for electric vehicles. The charging device in the embodiments of the present application is built-in with a first bidirectional DC conversion module, which can be directly coupled with the DC bus of the power converter, the photovoltaic module and the energy storage module. In view of the problems of installation limitation, poor expansibility and insufficient safety of the related DC bus coupling scheme of the charging device, the first bidirectional DC conversion module built-in in the charging device in the embodiments of the present application is directly coupled to the photovoltaic module or the energy storage module, and energy management is realized through inter-port communication, thereby improving energy utilization efficiency, enhancing system compatibility and safety, and adapting to the application requirements of multiple scenarios.

[0063] The above embodiments do not limit the number of charging devices in the light storage and charging system, which can be one or more, for example. In the case of multiple charging devices, the multiple charging devices can be multiple charging gun heads in one charging pile, or multiple separately arranged charging piles.

[0064] The charging device, the energy storage module, and the power converter in the above light storage and charging system are installed in a split type, for example, each hardware facility is independently installed, instead of being integrated in the same device or body. Compared with the integrated design, the split type structure decouples the installation positions of the charging device, the energy storage module, and the power converter, breaks through the space limitation, facilitates the high-power scene application and later expansion, and reduces the risk of single point failure.

[0065] Different ways of direct current coupling of the charging device are described below.

[0066] In the case that the charging device is directly coupled to the direct current bus of the power converter, the power distribution on the direct current bus can be uniformly scheduled by the power converter, and the charging device takes power from the direct current bus. Since the direct current bus voltage may fluctuate with the state of the photovoltaic module and the energy storage module, the charging device needs complex adaptation and protection design. Secondly, when adding a charging device or modifying existing hardware facilities, the control logic of the direct current bus often needs to be re-adapted. In addition, for the light storage system without a reserved direct current bus interface, it is difficult to support direct current charging through simple modification, which is difficult to modify and has high cost.

[0067] In the embodiments of the present application, the charging device is provided with a first bidirectional direct current conversion module. The first bidirectional direct current conversion module is not directly coupled to the direct current bus of the power converter, but can be coupled to the photovoltaic module or the energy storage module. Specifically, the charging device can be connected to between the energy storage module and the power converter through the first bidirectional direct current conversion module, or the charging device can be connected to between the photovoltaic module and the power converter through the first bidirectional direct current conversion module. That is, by embedding the first bidirectional direct current conversion module in the charging device, the split type installation of the charging device and the power converter can be realized, and the charging device and the power converter are decoupled. The energy scheduling can be realized through communication between the power converter and the charging device, instead of completely relying on the direct current bus voltage adaptation.

[0068] Unlike the related scheme which adopts an integrated direct current bus coupling, the above embodiments adopt a split type direct connection coupling and realize energy scheduling through communication, which not only breaks through the power limitation of the grid side into the house, but also improves the system compatibility, installation flexibility, and safety.

[0069] Specifically, first, in the related AC coupling scheme, the input power of the charging device must first pass through the power grid, and the power grid has an upper limit on the user's home power (for example, the home capacity is 10 kW), so no matter how much energy the photovoltaic module and the energy storage module can provide, the charging device is restricted by the home power of the power grid side. In the DC coupling scheme provided in the embodiments of the present application, the first bidirectional DC conversion module of the charging device is directly coupled to the photovoltaic module or the energy storage module, and the power is directly supplied between the photovoltaic module side or the energy storage module side and the charging device in DC, without passing through the power grid home branch. This means that the power generated by the photovoltaic module can bypass the power limit of the power grid side and be directly sent to the charging device; the energy released by the energy storage module also does not need to pass through the power grid, but is directly supplied to the charging device in DC. This structure enables the charging device to directly obtain the DC power of the photovoltaic module side or the energy storage module side, bypassing the restriction of having to pass through the AC power grid home branch, and realizing DC direct supply that bypasses the power limit of the power grid side. Therefore, the available power of the charging device is no longer limited by the home capacity of the power grid side, but is determined by the power of the photovoltaic module and the energy storage module, thereby effectively breaking through the power limit of the power grid side.

[0070] Second, the charging device, the energy storage module, and the power converter in the photovoltaic energy storage and charging system are installed in a split type. The separately arranged charging device, energy storage module, and power converter have low land occupation requirements and are less limited in installation location, so the photovoltaic energy storage and charging system has the advantages of higher installation flexibility, no limitation on installation location, no limitation on the number of charging devices, and no limitation on application scenarios, and can cover installation requirements in various scenarios, including household scenarios and industrial and commercial scenarios. For example, in a household scenario, compared with integrated installation, split installation can break through the constraint of strong binding between the location of the charging device and the household energy storage equipment, and installation is more convenient. In an industrial and commercial scenario, split installation decouples the large volume energy storage module from the charging device, greatly facilitating installation operations.

[0071] Third, the photovoltaic energy storage and charging system has the advantages of strong scalability and low transformation cost. Since there is no need to transform the DC bus inside the power converter, the transformation difficulty and cost can be reduced. In particular, for an existing photovoltaic energy storage system, in the case of using a battery coupling mode (i.e., the first bidirectional DC conversion module in the charging device is connected between the energy storage module and the power converter), no hardware circuit needs to be modified, only software needs to be upgraded, and a small amount of structural changes are needed to realize the function of the DC photovoltaic energy storage and charging system that breaks through the home power limit. In an industrial and commercial scenario, a single power converter can provide a large power, and the energy storage module matched with the power converter can reduce its dependence on AC network power. Therefore, the system power of 1 power converter can meet the power requirements of multiple charging devices, bringing broad commercial prospects.

[0072] Fourthly, the light storage and charging system can improve safety. The first bidirectional DC conversion module is built in the charging device, which facilitates the detection and related control functions of various DC signals on site, is more accurate and timely than DC bus detection, and can reduce the risk of electric arc and power loss caused by long-distance DC bus wiring.

[0073] In addition, the light storage and charging system can also improve energy utilization efficiency. Since the charging device is directly coupled to the photovoltaic module or the energy storage module through the first bidirectional DC module, it can directly utilize the energy provided by the photovoltaic module or the energy storage module, reducing the intermediate links of "photovoltaic module or energy storage module→DC bus→power converter scheduling→charging device power supply", thereby reducing energy conversion loss and achieving higher DC charging efficiency.

[0074] Referring to Figure 3 and Figure 4 , Figure 3 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application, Figure 4 is a structural block diagram of another light storage and charging system provided by an embodiment of the present application.

[0075] In a specific application scenario, the light storage and charging system may, for example, include a photovoltaic module, an energy storage module, a charging device, and a power converter. The power converter can be provided with an inverter (INV) and a DC bus. The AC side of the inverter is connected to an AC network, and the DC side of the inverter is connected to the DC bus. The DC bus is also connected to the energy storage module and the photovoltaic module, respectively.

[0076] As Figure 3 indicated, the power converter can also be provided with a BDC (Bi-directional DC-DC Converter, bidirectional DC-DC converter). The BDC can be connected between the DC bus and the energy storage module, and is used to realize the function of bidirectional energy transmission between the DC bus and the energy storage module.

[0077] Still as Figure 3 indicated, in the case where the charging device is directly coupled to the energy storage module, the power converter can also be provided with a boost-down module (for example, a BOOST circuit, a BUCK circuit, or a BUCK-BOOST circuit). BOOST is a boost, and BUCK is a buck. The boost-down module can be connected between the DC bus and the photovoltaic module, and is used to transmit the power provided by the photovoltaic module to the DC bus.

[0078] As described above, in some embodiments, the first bidirectional DC-DC converter module can be used to connect between the energy storage module and the power converter. The power converter may include an inverter circuit, a DC bus, and a buck-boost module. The AC side of the inverter circuit is connected to the AC network, and the DC side of the inverter circuit is connected to the DC bus. The DC bus is also used to connect to the energy storage module, and further, it is used to connect to the photovoltaic module via the buck-boost module. The DC bus can be connected to the energy storage module, for example, via a BDC converter.

[0079] In the power converter of the relevant photovoltaic-storage-charging system, bidirectional energy flow is possible between the DC bus and the energy storage module. The energy storage module can discharge to the DC bus or draw power from the DC bus. Between the DC bus and the photovoltaic module, the DC bus can be connected to the photovoltaic module via a buck-boost module (e.g., a BOOST circuit, BUCK circuit, or BUCK-BOOST circuit) to achieve unidirectional energy flow, i.e., energy is transferred from the photovoltaic module to the DC bus. In the above embodiment, the first bidirectional DC module is connected between the energy storage module and the power converter; that is, the charging device is DC coupled to the energy storage module (not the photovoltaic module). In this case, for the energy flow mode within the power converter, it is still only necessary to achieve bidirectional flow between the energy storage module and the DC bus, while the energy flow mode between the photovoltaic module and the DC bus is not limited. Therefore, no hardware modification to the existing power converter is required. This photovoltaic-storage-charging system has low hardware modification costs, low modification difficulty, is easy to expand and implement, and has high compatibility, showing broad application prospects.

[0080] like Figure 4 As shown, when the charging device is DC coupled to the photovoltaic module, the power converter may also be equipped with a second bidirectional DC-DC converter module. The second bidirectional DC-DC converter module can be connected between the DC bus and the photovoltaic module, and is used to transmit the electrical energy provided by the photovoltaic module to the DC bus, and to transmit the electrical energy provided by the DC bus to the first bidirectional DC-DC converter module.

[0081] As described above, in some embodiments, the first bidirectional DC-DC converter module can be used to connect between the photovoltaic module and the power converter. The power converter may include an inverter circuit, a DC bus, and a second bidirectional DC-DC converter module. The AC side of the inverter circuit is connected to the AC network, and the DC side of the inverter circuit is connected to the DC bus. The DC bus is also used to connect to the energy storage module, and further, it is used to connect to the photovoltaic module via the second bidirectional DC-DC converter module. The DC bus can be connected to the energy storage module, for example, via a BDC converter.

[0082] Therefore, the charging device can directly use the electric energy generated by the photovoltaic module, and by arranging the second bidirectional direct-current conversion module, not only the electric energy provided by the photovoltaic module can be transmitted to the direct-current bus, but also when the photovoltaic module generates insufficient electric energy, the energy source can be flexibly switched, and the electric energy provided by the direct-current bus can be transmitted to the charging device through the second bidirectional direct-current conversion module, so that the direct-current power supply capacity of the system is improved.

[0083] In the related light storage and charging system, arc flash faults are prone to occur due to plug-in connection, poor contact or power fluctuation. Arc flash is a kind of continuous discharge phenomenon caused by voltage breakdown between conductors and ionization of gas when the distance between the charged conductors and the conductors (or ground) is close. In the energy storage system, arc flash may be caused by poor contact of the connection point, aging or damage of the insulating material, sudden disconnection of the circuit, etc. Due to the characteristics of high voltage, large current and multiple connection points on the direct-current side of the energy storage module, arc flash faults are easily triggered. Once arc flash occurs, it may quickly lead to thermal runaway of the system, releasing a large amount of heat energy and posing a serious threat to personnel, assets and equipment. Therefore, in the risk management of the light storage and charging system, it is necessary to prevent fires caused by arc flash faults, so as to ensure the safe operation of the system.

[0084] In order to realize reliable arc flash detection and arc extinction control in the direct-current coupling scene, the current detection unit can be introduced at the key positions of the charging device and the power converter in the embodiments of the present application, and the arc flash detection control unit and the disconnecting device are combined to form a complete arc flash detection and protection link, so that arc flash can be quickly identified and arc extinction protection operation can be performed in the early stage of arc flash, and the fault can be removed in time to ensure the safe operation of the system. As an example, arc flash detection and arc extinction control can be performed in industrial and commercial scenes.

[0085] Referring to Figure 5 , Figure 5 is a structural block diagram of a charging device provided by the embodiments of the present application.

[0086] In some embodiments, the charging device can further include a first current detection unit and an arc flash detection control unit. The first current detection unit is configured to detect a first current between the charging device and the electric vehicle, and provide a detected first current signal to the arc flash detection control unit. The arc flash detection control unit is configured to perform corresponding arc extinction protection operation when the received first current signal indicates that an arc flash fault occurs.

[0087] The charging device can further include a first disconnecting device connected between the first bidirectional DC conversion module and the electric vehicle. The arc detection control unit is configured to control the first disconnecting device to disconnect in the case that the received first current signal indicates that an arc fault occurs, so as to disconnect the electrical connection between the first bidirectional DC conversion module and the electric vehicle.

[0088] In some embodiments, the first bidirectional DC conversion module can include the arc detection control unit, that is, the arc detection control unit can be integrally arranged on the first bidirectional DC conversion module. In other embodiments, the arc detection control unit can be separately arranged, that is, the arc detection control unit and the first bidirectional DC conversion module are independently arranged in the charging device.

[0089] In the above embodiments, the first current detection unit is configured to detect the first current between the charging device and the electric vehicle in real time, and provide the detected first current signal to the arc detection control unit. The arc detection control unit is configured to analyze the first current signal, and when the signal characteristic indicates that an arc fault occurs, perform corresponding arc extinguishing protection operation, for example, generate a first control instruction for controlling the first disconnecting device to disconnect. Accordingly, the first disconnecting device quickly disconnects the DC loop and cuts off the electrical connection between the first bidirectional DC conversion module and the electric vehicle when receiving the first control instruction, thereby achieving arc extinguishing protection.

[0090] In some specific implementations, the first current detection unit can be implemented by a Hall sensor, a shunt resistor or a current transformer to sense the current and generate the first current signal. The arc detection control unit can analyze the waveform of the first current signal by a digital signal processing algorithm to identify arc characteristics, such as current drop, high-frequency noise or abnormal fluctuation. The first disconnecting device can be a DC circuit breaker, a DC contactor or a solid-state switching device for performing physical disconnecting action.

[0091] As an example, the first disconnecting device can be integrally arranged in the first bidirectional DC conversion module. As another example, the first disconnecting device can be independently arranged with the first bidirectional DC conversion module. As yet another example, the number of first disconnecting devices can be multiple, at least one first disconnecting device can be arranged in the first bidirectional DC conversion module, and at least one first disconnecting device can be independently arranged with the first bidirectional DC conversion module.

[0092] Therefore, the above embodiments can identify and quickly cut off the fault loop between the charging device and the electric vehicle at an early stage of arc fault occurrence, reduce the risk of arc ablation and fire to the device, and significantly improve the operation safety and reliability of the light storage and charging system in the DC coupling process.

[0093] Referring to Figure 6 , Figure 6 is a structural block diagram of another charging device provided by an embodiment of the present application.

[0094] In some embodiments, the charging device can further include a second current detection unit and an arc detection control unit. The second current detection unit is configured to detect a second current between the charging device and the power converter, and provide a detected second current signal to the arc detection control unit. The arc detection control unit is configured to perform corresponding arc extinguishing protection operation in a case where the received second current signal indicates that an arc fault occurs.

[0095] In some embodiments, the charging device can further include a second current detection unit and an arc detection control unit. The second current detection unit is configured to detect a second current between the charging device and the power converter, and provide a detected second current signal to the arc detection control unit. The arc detection control unit is configured to perform corresponding arc extinguishing protection operation in a case where the received second current signal indicates that an arc fault occurs.

[0096] In some embodiments, the power converter is configured to control the third disconnection device to disconnect the electrical connection between the inverter circuit and the AC network in response to the arc fault information. In other embodiments, the power converter is configured to stop outputting the switch driving signal to the inverter circuit in response to the arc fault information. In yet other embodiments, the power converter is configured to control the third disconnection device to disconnect the electrical connection between the inverter circuit and the AC network, and stop outputting the switch driving signal to the inverter circuit in response to the arc fault information.

[0097] In the above embodiments, the second current detection unit is configured to detect the second current between the charging device and the power converter in real time, and provide the detected second current signal to the arc detection control unit. The arc detection control unit is configured to analyze the second current signal, and when it is determined that an arc fault occurs, the second breaking device can be controlled to be opened to disconnect the electrical connection between the first bidirectional DC conversion module and the power converter, and arc fault information can be generated and sent to the power converter.

[0098] After receiving the arc fault information sent by the arc detection control unit, the power converter can perform at least one of the following two types of arc extinguishing protection operations. First, the third breaking device is controlled to be opened to disconnect the electrical connection between the inverter circuit and the AC network, thereby reducing the impact of the arc fault on the AC network. In the case where the inverter circuit is also connected to the load through the third breaking device, controlling the third breaking device to be opened can also disconnect the electrical connection between the inverter circuit and the load, thereby reducing the impact of the arc fault on the load. Second, the output of the switch driving signal to the inverter circuit is stopped, thereby cutting off the energy flow path. In the case where the switch driving signal is a PWM (Pulse Width Modulation) waveform signal, the second type of arc extinguishing protection operation can be referred to as a PWM blocking operation.

[0099] In some specific implementations, the second current detection unit can be implemented by a Hall current sensor, a shunt resistor, or a current transformer. The second breaking device can be a DC circuit breaker, a DC contactor, or a solid-state switching device, which is used to perform a physical breaking action. The third breaking device can be an AC circuit breaker, an AC contactor, or a solid-state switching device. For example, as shown in FIG. 1, the third breaking device can be the first switching device K1. Figure 6

[0100] As an example, the second breaking device can be integrated in the first bidirectional DC conversion module. As another example, the second breaking device can be independently provided in the charging device from the first bidirectional DC conversion module. As yet another example, the number of second breaking devices can be multiple, at least one second breaking device can be provided in the first bidirectional DC conversion module, and at least one second breaking device can be independently provided in the charging device from the first bidirectional DC conversion module.

[0101] Therefore, by providing the second current detection unit and the arc detection control unit, and cooperating with the third breaking device of the power converter, the above embodiments can timely respond and isolate when an arc fault occurs between the charging device and the power converter, thereby significantly improving the operation safety and reliability of the light storage and charging system in the DC coupling process.

[0102] ​In the case that the first current detection unit, the second current detection unit and the arc detection control unit are simultaneously provided, the embodiments of the present application realize multi-level arc detection and protection in a direct current coupling scenario, which can handle arc fault between the charging device and the electric vehicle, and also handle arc fault between the charging device and the power converter. Thus, arc fault can be found and isolated in time, the operation safety of the light storage and charging system is improved, and the demand for high safety level direct current charging in different scenarios of industrial and commercial and household is met. Through modular arrangement of the detection and breaking unit, flexible expansion and upgrade of the split system can be realized.

[0103] The above embodiments do not limit the communication connection mode between the ports, which may, for example, adopt wired communication connection and / or wireless communication connection. In some embodiments, the power converter and the charging device can adopt serial communication connection and / or controller area network communication connection. As an example, the power converter and the charging device adopt serial communication connection. As another example, the power converter and the charging device adopt controller area network communication connection. As an example, the power converter and the charging device adopt serial communication connection and controller area network communication connection.

[0104] Referring to Figure 7 , Figure 7 is a structural schematic diagram of a light storage and charging system provided by an embodiment of the present application.

[0105] As Figure 7 indicated, in one specific application scenario, the light storage and charging system may, for example, include a photovoltaic module, an energy storage module, a charging device and a power converter.

[0106] The power converter can be provided with an inverter circuit (INV) and a direct current bus. The alternating current side of the inverter circuit is connected to an alternating current network and an ESP load respectively, and the direct current side of the inverter circuit is connected to the direct current bus. The direct current bus is also connected to the energy storage module and the photovoltaic module respectively. The first bidirectional direct current conversion module in the charging device can be connected between the power converter and the energy storage module, the direct current bus can be connected to the photovoltaic module through a boost and buck module, and the direct current bus can also be connected to the energy storage module through a BDC.

[0107] The power converter can further comprise a first switching device K1 and a second switching device K2, the first switching device K1 is arranged between the inverter circuit and the AC network, and the second switching device K2 is arranged between the first switching device K1 and the AC network. The ESP load can be connected between the first switching device K1 and the second switching device K2. The first switching device K1 functions to turn on and off the electrical connection between the inverter circuit and the AC network or the ESP load, and the second switching device K2 functions to turn on and off the electrical connection between the inverter circuit and the AC network.

[0108] The power converter can further be provided with a communication unit and a control unit connected to each other, the communication unit is in communication connection with the charging device and the communication stick respectively, and the control unit is connected to the inverter circuit and is also in communication connection with the charging device. The communication unit is used to interact with the charging device and the communication stick to obtain information such as voltage, current, power and operating state. The control unit is used to perform real-time operation and control on the inverter circuit to generate a switching driving signal, which is used to control the on-off of the switching device in the inverter circuit, so as to realize the voltage and current regulation and power flow control of the inverter circuit. The communication unit can be an ARM (Advanced RISC Machine) communication unit, and the control unit can be a DSP (Digital Signal Processor) control unit.

[0109] The above embodiments do not limit the communication stick, which can be an external communication module for example, used to expand the communication capability between the power converter and external devices. The communication stick can adopt one or more of wireless communication modes (such as Wi-Fi, 4G / 5G, Bluetooth or ZigBee) and wired communication modes (such as RS485, CAN or Ethernet) to realize uploading of the running data of the power converter and receiving of remote scheduling instructions, so as to improve the remote monitoring and operation and maintenance capability of the light storage and charging system. Wi-Fi stands for Wireless Fidelity, which is a wireless fidelity. ZigBee is also called purple bee, which is a low-speed short-distance transmission wireless network protocol. RS485 stands for Recommended Standard 485, which is a serial communication standard. CAN stands for Controller Area Network, which is a controller local area network.

[0110] For example, Figure 7As shown, the power converter can include an ARM communication unit and a DSP control unit, and the charging device can include a TCU (Telematics Control Unit) and a CCU (Charging Control Unit). The TCU includes a first storage unit, a first communication unit, an encryption unit, a billing unit, a control unit, and an authentication unit, for realizing identity authentication, encryption processing, billing management, and communication with an external platform of the charging device. The CCU includes a second storage unit, a second communication unit, and a charging control unit, for controlling the DC output voltage and current of the charging device. The charging device can further be provided with an insulation detection circuit, which can be connected to the CCU, for detecting the insulation state of the DC loop of the charging device. As an example, when it is detected that the insulation resistance between the charging device and the electric vehicle is lower than a preset safety threshold, the insulation detection circuit can output an insulation fault signal to the CCU, so that the CCU controls the first bidirectional DC conversion module to stop charging or disconnect the output, thereby reducing the risk of electric shock, arc or fire caused by insulation failure. The insulation detection circuit can be arranged in a resistance voltage division manner or a signal injection manner, which is not limited in the embodiments of the application.

[0111] Among them, the ARM communication unit and the TCU can be connected in series (for example, RS485 communication connection). The DSP control unit and the TCU can be connected by CAN communication. The TCU and the CCU can be connected by ETH (Ethernet) communication. The TCU and the platform (for example, operation platform) or EMS (Energy Management System) can be connected by 4G or ETH communication. The CCU and the vehicle-mounted BMS (Battery Management System) can be connected by CAN communication. The first bidirectional DC conversion module and the TCU can be connected by CAN communication, and the first bidirectional DC conversion module and the CCU can be connected by CAN communication.

[0112] The above embodiments do not limit the voltage amplitude between the first bidirectional DC conversion module and the electric vehicle (for example, EV), which can be, for example, 150V to 1000V. Among them, EV stands for Electric Vehicle, electric vehicle.

[0113] Referring to Figure 8 , Figure 9 and Figure 10 , Figure 8 is a green electricity fast charging mode schematic diagram provided by an embodiment of the application, Figure 9 is a super-fast charging mode schematic diagram provided by an embodiment of the application, Figure 10is a V2X mode schematic diagram provided by an embodiment of the present application. In the figure, PV is an example of a photovoltaic module, BAT is an example of an energy storage module, INV is an example of an inverter circuit in a power converter, K1 and K2 are switching devices, CT is a current sensor, the power grid is an example of an alternating current network, Home Load is a household load, EPS Load is an EPS load, and the electric vehicle (referred to as "vehicle" in the figure) is an example of an electric vehicle. The direct current side of the inverter circuit is connected to the photovoltaic module through a BOOST (voltage boosting circuit), and the direct current side of the inverter circuit is connected to the energy storage module through a BDC. The alternating current side of the inverter circuit is connected to the power grid and the household load through the first switching device K1 and the second switching device K2 and the electric meter, respectively, and the alternating current side of the inverter circuit is also connected to the EPS load through the first switching device K1. The power converter has a Grid port for connecting with the electric meter, and an EPS port for connecting with the EPS load. The power converter also has a monitoring interface for communicatively connecting with a monitoring part of the charging device (in the figure, "communication" is equivalent to "communication").

[0114] It can be seen that the above-mentioned photovoltaic energy storage and charging system does not limit the energy scheduling mode that can be achieved by the power converter.

[0115] As shown in Figure 8 , in the green electricity fast charging mode, the electric energy provided by the photovoltaic module and the energy storage module can be transmitted to the electric vehicle through the first bidirectional direct current conversion module in the charging device. As an example, the first bidirectional direct current conversion module can charge the electric vehicle through the charging gun, and the monitoring part in the charging device can be communicatively connected with the charging gun. Among them, the charging path of the energy storage module is, for example: photovoltaic module→first bidirectional direct current conversion module→charging gun→electric vehicle; and the charging path of the photovoltaic module is, for example: photovoltaic module→BOOST→BDC→first bidirectional direct current conversion module→charging gun→electric vehicle.

[0116] As shown in Figure 9 , in the super-fast charging mode, the electric energy provided by the photovoltaic module, the energy storage module and the alternating current network can be transmitted to the electric vehicle through the first bidirectional direct current conversion module in the charging device. Among them, the charging path of the alternating current network is, for example: alternating current network→electric meter→inverter circuit→BDC→first bidirectional direct current conversion module→charging gun→electric vehicle; and the charging paths of the energy storage module and the photovoltaic module can be similar to the green electricity fast charging mode, which will not be described again.

[0117] As shown in Figure 10As shown, in the off-grid operation mode, the electric energy provided by the electric vehicle can be transmitted to the load through the first bidirectional DC conversion module in the charging device. The discharge path of the electric vehicle is, for example: electric vehicle → charging gun → first bidirectional DC conversion module → BDC → inverter circuit → EPS load.

[0118] Still as Figure 10 shown, in the on-grid operation mode, the electric energy provided by the electric vehicle can be transmitted to the alternating current network (for example, an alternating current power grid) through the first bidirectional DC conversion module in the charging device, which can also be referred to as a V2G mode. The discharge path of the electric vehicle is, for example: electric vehicle → charging gun → first bidirectional DC conversion module → BDC → inverter circuit → electric meter → alternating current network.

[0119] Referring to Figure 11 , Figure 12 and Figure 13 , Figure 11 is a structural schematic diagram of a light storage and charging system provided by an embodiment of the present application, Figure 12 is a structural schematic diagram of another light storage and charging system provided by an embodiment of the present application, Figure 13 is a structural schematic diagram of still another light storage and charging system provided by an embodiment of the present application. In the diagram, the battery is an example of an energy storage module, the inverter is an example of a power converter, the grid is an example of an alternating current network, and the EV Charge (electric vehicle charging device) is an example of a charging device. The full name of WiNet is Wisdom NetWork, which means intelligent network.

[0120] The above embodiments do not limit the number of charging devices in the light storage and charging system, which can be, for example, one or more.

[0121] As Figure 11 shown, in some embodiments, the charging device is connected between the energy storage module and the power converter, and the number of charging devices is one. At this time, the light storage and charging system can be regarded as a single-machine single-device system, where single machine refers to one power converter and single device refers to one charging device. The power cable (or power cable) of the charging device can be connected to the connection between the power converter and the energy storage module, and the cable length can cover household and commercial scenarios. The power converter and the charging device are in communication connection, and energy scheduling between four ports (alternating current network, energy storage module, photovoltaic module, and charging device) is realized according to the energy transmission path. The system can realize bidirectional charging and discharging function, support on-grid operation and off-grid operation. The charging device can have, for example, current detection and arc detection control function, which can detect arc fault between the charging device and the electric vehicle, between the charging device and the power converter, and perform corresponding arc extinguishing protection operation.

[0122] As shown in Figure 12 In other embodiments, the charging device is connected between the energy storage module and the power converter, and the number of charging devices is multiple. At this time, the optical energy storage and charging system can be regarded as a single-machine multi-device system, where single-machine refers to one power converter, and multi-device refers to multiple charging devices. The multiple charging devices can be multiple charging gun heads in one charging pile, or the multiple charging devices can be multiple independent charging piles. The single-machine multi-device system can cope with more power scenarios. The cable connection, energy flow, and arc detection function in the single-machine multi-device system are similar to those in the single-machine single-device system. The different charging devices can be connected through CAN or ETH.

[0123] As shown in Figure 13 In still other embodiments, the charging device is connected between the photovoltaic module and the power converter, and the number of charging devices can be one or multiple. The power converter can be provided with a direct current bus and a second bidirectional direct current conversion module, and the second bidirectional direct current conversion module is arranged between the direct current bus and the photovoltaic module.

[0124] Referring to Figure 14 , Figure 14 is a flowchart of a control method of an optical energy storage and charging system provided by an embodiment of the present application.

[0125] The present application also provides a control method of an optical energy storage and charging system, which comprises a charging device, an energy storage module, a photovoltaic module, and a power converter.

[0126] The charging device comprises a first bidirectional direct current conversion module; the first bidirectional direct current conversion module is used to be connected between the energy storage module and the power converter, or the first bidirectional direct current conversion module is used to be connected between the photovoltaic module and the power converter; and the first bidirectional direct current conversion module is also used to be connected to an electric vehicle.

[0127] The energy storage module is used to store electric energy.

[0128] The photovoltaic module is used to collect solar energy and convert it into electric energy.

[0129] The power converter is used to be connected to the energy storage module, the photovoltaic module, and an alternating current network respectively, and the power converter is also used to be in communication connection with the charging device. The power converter is used to control the energy scheduling among the charging device, the energy storage module, the photovoltaic module, and the alternating current network.

[0130] The method comprises the step S101 of controlling the energy scheduling among the charging device, the energy storage module, the photovoltaic module, and the alternating current network by the power converter.

[0131] The charging device, the energy storage module and the power converter are arranged in a split type.

[0132] To precisely control the energy scheduling between the charging device and other devices, the output voltage and output current of the first bidirectional DC conversion module can be adjusted. In some embodiments, the method of controlling the energy scheduling between the charging device, the energy storage module, the photovoltaic module and the AC network through the power converter can include: determining the target voltage and / or target current of the charging device in response to the charging and discharging working condition of the charging device through the power converter; generating a scheduling instruction based on the target voltage and / or the target current and providing it to the charging device; wherein the charging device is configured to adjust the output voltage and / or output current of the first bidirectional DC conversion module in response to the scheduling instruction, so that the output voltage and / or output current of the charging device is equal to the target voltage and / or the target current.

[0133] Referring to Figure 15 , Figure 15 is a structural block diagram of a controller provided by an embodiment of the present application.

[0134] The embodiment of the present application further provides a controller used for executing any of the above methods.

[0135] In some embodiments, the controller comprises a memory and a processor, the memory stores a computer program, and the processor implements the method provided by the above embodiments when executing the computer program.

[0136] The controller can comprise a memory 110, a processor 120 and a communication interface 130. The memory 110, the processor 120 and the communication interface 130 are connected through an internal connection path.

[0137] The memory 110 is configured to store a computer program. In some implementations, the computer program can include codes for implementing the method of the embodiments of the present application.

[0138] The processor 120 is configured to execute the computer program stored in the memory 110 to control the communication interface 130 to receive input data and information, output operation results and the like. In some implementations, when the scheme of the embodiments of the present application is implemented by software or firmware, the computer program for implementing the scheme of the embodiments of the present application can be saved in the processor 120 and executed by the processor 120.

[0139] The memory 110 can be a volatile memory or a nonvolatile memory, or can include both volatile and nonvolatile memory. Among them, the nonvolatile memory can be a read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM). It should be noted that the memory 110 described herein is intended to include, but not limited to, any memory of these and other suitable types. As an example, the memory 110 includes a random access memory (RAM), a cache memory, and a read only memory (ROM). Among them, the memory 110 stores a computer program, which can be executed by the processor 120, so that the processor 120 implements the steps of any of the above methods.

[0140] The processor 120 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor 120 can also be any conventional processor.

[0141] In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor 120 or the instruction in the form of software. The method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by hardware and software modules in the processor 120. The software module can be located in the storage medium mature in the art such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory 110, and the processor 120 reads the information in the memory 110, and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0142] In some implementations, the controller can include, in addition to the hardware units described above, software modules, which can be, for example, an operating system, a Basic Input Output System (BIOS), application software, and the like.

[0143] The operating system is used to manage one or more of the hardware and software resources of the controller, and is the kernel and cornerstone of the controller. The operating system needs to handle basic transactions such as managing and configuring memory, determining the priority of system resource supply and demand, controlling input and output devices, operating the network, and managing the file system. In order to facilitate user operation, most operating systems will provide an operation interface for users to interact with the system.

[0144] The BIOS is used to run hardware initialization during the power-on boot stage, and to provide runtime services for the operating system and application programs. In some implementations, the BIOS can also monitor the display processor temperature and perform temperature protection strategies, and the like.

[0145] The application software, also known as the application program, can be understood as software written for a certain special application purpose of the user, and is one of the main classifications of computer software. For example, the application software can be a program for implementing power control, temperature management, and the like.

[0146] The embodiment of the present application further provides a computer readable storage medium, the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method provided by the above embodiment.

[0147] The embodiment of the present application further provides a computer program product, the computer program product includes a computer program, and the computer program is executed by a processor to implement the method provided by the above embodiment.

[0148] The computer program product can adopt a portable compact disc read-only memory (CD-ROM) and include a program code, and can run on a terminal device, such as a personal computer. However, the computer program product of the present application is not limited thereto, and the computer program product can adopt any combination of one or more computer readable media.

[0149] The embodiment of the present application further provides a chip, which is used to execute the method provided by the above embodiment.

[0150] It can be understood that the specific examples in the present application are only to help those skilled in the art better understand the embodiments of the present application, and not to limit the protection scope of the present application.

[0151] It can be understood that, in various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the present application.

[0152] It can be understood that the various embodiments described in the present application can be implemented alone or in combination, and the present application does not limit this.

[0153] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the scope of the present application. The term "one or more" used in the present application includes any and all combinations of one or more related listed items. The singular forms "a", "an" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0154] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be realized in electronic hardware, or in a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0155] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes and beneficial effects of the above-described embodiments can refer to the corresponding processes and beneficial effects in other embodiments, which will not be repeated here.

[0156] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the above-described device embodiments are only schematic, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed mutual ones can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0157] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the technical solutions of the present application.

[0158] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0159] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the present application that essentially contribute to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium, including a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and various program code storage media.

[0160] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A light storage and charging system, characterized by, The light storage and charging system comprises a charging device, an energy storage module, a photovoltaic module and a power converter; The charging device comprises a first bidirectional DC conversion module; the first bidirectional DC conversion module is used to be connected between the energy storage module and the power converter, or the first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter; the first bidirectional DC conversion module is also used to be connected to an electric vehicle; The energy storage module is used to store electric energy; The photovoltaic module is used to collect solar energy and convert it into electric energy; The power converter is used to be connected to the energy storage module, the photovoltaic module and an alternating current network respectively, and is also used to be communicatively connected with the charging device; the power converter is used to control energy scheduling among the charging device, the energy storage module, the photovoltaic module and the alternating current network; The charging device, the energy storage module and the power converter are installed in a split type, and the electric vehicle comprises an electric vehicle and / or an electric bicycle; The charging device further comprises a second current detection unit and an arc detection control unit; the second current detection unit is used to detect a second current between the charging device and the power converter, and provide a detected second current signal to the arc detection control unit; the arc detection control unit is used to perform corresponding arc extinguishing protection operation when the received second current signal indicates that an arc fault occurs; The charging device further comprises a second breaking device connected between the first bidirectional DC conversion module and the power converter; the power converter comprises a DC bus, an inverter circuit and a third breaking device; the DC bus is used to be connected to the energy storage module, the photovoltaic module and a DC side of the inverter circuit respectively; an AC side of the inverter circuit is used to be connected to the alternating current network through the third breaking device; the arc detection control unit is used to control the second breaking device to be disconnected to disconnect the electrical connection between the first bidirectional DC conversion module and the power converter, and send arc fault information to the power converter when the received second current signal indicates that an arc fault occurs; the power converter is used to control the third breaking device to be disconnected to disconnect the electrical connection between the inverter circuit and the alternating current network, and / or stop outputting a switch driving signal to the inverter circuit in response to the arc fault information.

2. The optical storage and charging system of claim 1, wherein, The first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter; The power converter comprises an inverter circuit, a DC bus and a second bidirectional DC conversion module; an AC side of the inverter circuit is used to be connected to the alternating current network; a DC side of the inverter circuit is used to be connected to the DC bus; the DC bus is also used to be connected to the energy storage module; and the DC bus is also used to be connected to the photovoltaic module through the second bidirectional DC conversion module.

3. The optical storage and charging system of claim 1, wherein, The first bidirectional DC conversion module is used to be connected between the energy storage module and the power converter; The power converter comprises an inverter circuit, a DC bus and a boost-buck module, the AC side of the inverter circuit is used to be connected to the AC network, the DC side of the inverter circuit is used to be connected to the DC bus, the DC bus is further used to be connected to the energy storage module, and the DC bus is further used to be connected to the photovoltaic module through the boost-buck module.

4. The optical storage and charging system of claim 1, wherein, The charging device further comprises a first current detection unit and an arc detection control unit; The first current detection unit is used to detect a first current between the charging device and the electric vehicle, and provide a detected first current signal to the arc detection control unit; The arc detection control unit is used to perform corresponding arc extinguishing protection operation when the received first current signal indicates that an arc fault occurs.

5. The optical storage and charging system of claim 4, wherein, The charging device further comprises a first breaking device connected between the first bidirectional DC conversion module and the electric vehicle; The arc detection control unit is used to control the first breaking device to be disconnected to disconnect the electrical connection between the first bidirectional DC conversion module and the electric vehicle when the received first current signal indicates that an arc fault occurs.

6. The optical storage and charging system of claim 1, wherein, The first bidirectional DC conversion module is used to transmit the electrical energy provided by at least one of the energy storage module, the photovoltaic module and the AC network to the electric vehicle, and transmit the electrical energy provided by the electric vehicle to the AC network and / or a load.

7. The optical storage and charging system of claim 1, wherein, The power converter and the charging device are connected through serial communication and / or controller area network communication.

8. A control method of a light storage and charge system characterized by, The light storage and charging system comprises a charging device, an energy storage module, a photovoltaic module and a power converter; The charging device comprises a first bidirectional DC conversion module, the first bidirectional DC conversion module is used to be connected between the energy storage module and the power converter, or the first bidirectional DC conversion module is used to be connected between the photovoltaic module and the power converter, and the first bidirectional DC conversion module is further used to be connected to an electric vehicle; The energy storage module is used to store electrical energy; The photovoltaic module is used to collect solar energy and convert it into electrical energy; The power converter is used to be connected to the energy storage module, the photovoltaic module and an AC network respectively, the power converter is further used to be communicatively connected to the charging device, and the power converter is used to control the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the AC network; The method comprises: controlling the energy scheduling among the charging device, the energy storage module, the photovoltaic module and the AC network through the power converter; The charging device, the energy storage module and the power converter are installed in a split type, and the electric vehicle comprises an electric vehicle and / or an electric bicycle. The charging device further comprises a second current detection unit and an arc detection control unit; the second current detection unit is configured to detect a second current between the charging device and the power converter, and provide a detected second current signal to the arc detection control unit; the arc detection control unit is configured to perform corresponding arc extinguishing protection operation when the received second current signal indicates that an arc fault occurs. The charging device further comprises a second breaking device connected between the first bidirectional DC conversion module and the power converter; the power converter comprises a DC bus, an inverter circuit and a third breaking device; the DC bus is configured to be connected to the energy storage module, the photovoltaic module and a DC side of the inverter circuit respectively; an AC side of the inverter circuit is configured to be connected to the AC network through the third breaking device; the arc detection control unit is configured to control the second breaking device to be disconnected to disconnect the electrical connection between the first bidirectional DC conversion module and the power converter, and send arc fault information to the power converter when the received second current signal indicates that an arc fault occurs; the power converter is configured to control the third breaking device to be disconnected to disconnect the electrical connection between the inverter circuit and the AC network, and / or stop outputting a switch driving signal to the inverter circuit in response to the arc fault information.

9. The control method of the optical storage and supply system according to claim 8, wherein The energy scheduling between the charging device, the energy storage module, the photovoltaic module and the AC network through the power converter comprises: The power converter performs the following processing: In response to the charging and discharging working condition of the charging device, the target voltage and / or the target current of the charging device are determined; Based on the target voltage and / or the target current, a scheduling instruction is generated and provided to the charging device; The charging device is configured to adjust the output voltage and / or the output current of the first bidirectional DC conversion module in response to the scheduling instruction, so that the output voltage and / or the output current of the charging device are equal to the target voltage and / or the target current.

10. A controller characterized by comprising: The controller is configured to perform the method of claim 8 or 9. The controller is configured to perform the method of claim 8 or 9.

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