A vehicle storage system supporting external compensation

Abstract

This invention relates to an on-board energy storage system supporting external compensation, belonging to the technical field of intelligent charging systems. The system includes an energy storage battery, a V2G module, an AC / DC module, a DC / DC module, an AC bus, a DC bus, a supplementary power interface, and multiple electric vehicle interfaces. The system can dynamically select the start / stop states of the energy storage battery, V2G module, AC / DC module, and DC / DC module based on the access status of the external power source and the charging power request of the electric vehicle, and achieve flexible energy flow management through contactor switching. This invention improves the utilization efficiency of distributed power sources and ensures charging and discharging stability and system adaptability under off-grid conditions.

Description

Technical Field

[0001] This invention belongs to the field of intelligent charging system technology, and in particular relates to an on-board storage system that supports external compensation. Background Technology

[0002] Vehicle-mounted energy storage systems are solutions that integrate vehicle mobility with energy storage and charging functions. Through onboard energy storage batteries and bidirectional power conversion technology, they enable the mobility of energy storage units and the flexibility of charging services. Vehicle-mounted energy storage systems can be moved to temporary sites, remote areas, or emergency scenarios, making them suitable for exhibitions, construction sites, disaster relief, field operations, and more.

[0003] In vehicle systems, weight and volume are key design constraints that directly affect the vehicle's energy consumption, range, and overall system performance. Although the subsystem can connect to distributed power sources such as photovoltaics and wind power, its energy scheduling mechanism is imperfect and cannot flexibly switch or effectively coordinate various power sources, resulting in the external supplementary power source not being able to play its full role.

[0004] Based on this, an on-board storage system that supports external compensation is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an in-vehicle storage system that supports external compensation, thereby improving the efficiency of the in-vehicle storage system.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] An on-board storage system supporting external compensation includes: an AC bus, a DC bus, a V2G module, and a supplementary power supply;

[0008] The AC bus is provided with an AC input terminal and an electric vehicle interface at both ends, and an AC / DC module is provided between the AC input terminal and the electric vehicle interface;

[0009] The DC bus is equipped with energy storage batteries and electric vehicle interfaces at both ends, and a DC / DC module is provided between the energy storage batteries and the electric vehicle interfaces.

[0010] The V2G module is electrically connected to the AC bus and the DC bus;

[0011] Supplemental power supply, electrically connected to the DC bus, with its connection point located on the side of the DC / DC module closest to the energy storage battery;

[0012] The DC / DC module is provided with an unloaded circuit at both ends. The two ends of the unloaded circuit are respectively connected to the DC bus on the side of the supplementary power supply near the energy storage battery and the DC bus on the other side of the DC / DC module.

[0013] The system is equipped with contactors for controlling the connection or disconnection between the AC input terminal, energy storage battery, electric vehicle interface no-load circuit, supplementary power supply and the system.

[0014] Furthermore, the supplementary power source includes one or more of photovoltaic power sources, wind turbines, or external vehicle batteries.

[0015] Furthermore, a contactor is provided between the unloaded circuit and the DC bus connection point near the energy storage battery side, and between the supplementary power supply and the DC bus connection point.

[0016] Furthermore, the system is provided with a first electric vehicle interface and a second electric vehicle interface;

[0017] The first electric vehicle interface is connected to the AC bus via the seventh contactor;

[0018] The second electric vehicle interface is connected to the DC bus via the eighth contactor;

[0019] The AC bus and the DC bus are connected by a wire harness equipped with a sixth contactor. The connection point of the wire harness and the AC bus is located on the side of the seventh contactor closer to the AC / DC module; the connection point of the wire harness and the DC bus is located on the side of the eighth contactor closer to the DC / DC module.

[0020] Furthermore, the system is equipped with a monitoring unit for real-time monitoring of the SOC status of the energy storage battery, the load status of the electric vehicle interface, and the output power of the supplementary power supply, and for controlling the connection or disconnection of the contactor based on the monitoring results.

[0021] Furthermore, the application scenarios of the vehicle-mounted storage system include:

[0022] Energy storage battery charging scenario: When the supplementary power supply is connected to an external distributed power supply, the supplementary power supply is used first to charge the energy storage battery; when the supplementary power supply cannot meet the charging needs of the energy storage battery, the energy storage battery is charged via the AC input terminal through the AC / DC module and / or the V2G module.

[0023] Vehicle battery charging scenario: When the supplementary power source is connected to the vehicle battery, it provides power to the vehicle battery through the V2G module and / or AC / DC module.

[0024] Electric vehicle charging scenario: Electric vehicles are charged through one or more of the DC / DC module, AC / DC module, and V2G module;

[0025] Discharging into the grid, or discharging into the grid via supplemental power sources and / or energy storage batteries.

[0026] Furthermore, the specific execution steps of the energy storage battery charging scenario are as follows;

[0027] Set the charging power and charge the energy storage battery.

[0028] When the supplementary power supply is connected to a distributed power source, the distributed power source charges the energy storage battery, and the charging power is guaranteed by the V2G module and / or AC / DC module.

[0029] When there is no external distributed power source for the supplementary power supply, the charging power is guaranteed through the V2G module and / or AC / DC module.

[0030] Furthermore, when the supplementary power source is connected to an external vehicle battery, the energy storage battery is charged via a V2G module and / or AC / DC.

[0031] Furthermore, the electric vehicle charging scenario includes;

[0032] When the power grid is available:

[0033] When the supplementary power interface is connected to a distributed power source, the distributed power source should be used first to charge the electric vehicle through the DC / DC module.

[0034] When the distributed power supply is insufficient, the AC / DC module and / or V2G module are activated to supplement the power.

[0035] When the system goes offline

[0036] The supplementary power supply connects to the vehicle battery first through the energy storage battery and then through the DC / DC module to charge the electric vehicle, and provides charging power through the V2G module and AC / DC module; when the energy storage battery SOC reaches the discharge threshold, it switches to the vehicle battery.

[0037] When supplementing power is connected to distributed power, the requested charging power, the output power of the distributed power, the rated output power of the DC / DC module, the efficiency of the V2G module, and the efficiency of the AC / DC module are determined based on the charging power request of one or more electric vehicles.

[0038] When the output power of the distributed power source is lower than or equal to the charging demand and efficiency loss threshold, the energy storage battery is used to enable the DC-DC module to charge the electric vehicle, and the power is guaranteed by the V2G module and AC / DC module.

[0039] When the output power of the distributed power source is higher than the charging demand and efficiency loss threshold but lower than the rated power of the DC-DC module, the DC-DC module is activated by the distributed power source to charge the electric vehicle. When the power of the distributed power source is insufficient, it is supplemented by the energy storage battery through the V2G module and the AC / DC module. When the SOC of the energy storage battery reaches the discharge threshold, it switches to the vehicle battery.

[0040] When the output power of the distributed power source exceeds the rated power of the DC-DC module, the distributed power source and the energy storage battery work together to charge the electric vehicle, activating the DC-DC, V2G and AC / DC modules.

[0041] Furthermore, when the system discharges to the power grid, the specific steps are as follows:

[0042] When the supplementary power source is connected to a distributed power source, the distributed power source discharges to the grid through the DC / DC module, and discharges to the grid through the energy storage battery and / or the external vehicle battery via the V2G module to ensure power.

[0043] Beneficial effects:

[0044] This disclosure addresses the issue of insufficient power supply in current vehicle-mounted storage systems after they are disconnected from the grid by using an external power source for compensation. Simultaneously, by streamlining the system and reducing its weight, the battery life of the vehicle-mounted system is further improved.

[0045] This disclosure integrates various external supplementary power sources, including vehicle batteries, photovoltaic or wind power, and defines the scheduling methods of external power sources and storage systems in different scenarios to improve the endurance of vehicle-mounted mobile storage systems.

[0046] This disclosure uses a hybrid AC / DC design, employing multiple types of power modules to increase the reusability of components in different scenarios, reduce system components, thereby reducing the weight and size of the vehicle system and balancing system conversion efficiency and cost.

[0047] This disclosure uses a V2G module to replace the conventional PCS, which is small in size, light in weight, easy to install in the vehicle system, and has a high degree of system integration.

[0048] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a block diagram of the module structure of an embodiment of this disclosure;

[0051] Figure 2 This is a control flowchart of an embodiment of the present disclosure. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Current on-board energy storage systems are integrated solutions combining vehicles and energy storage units, typically consisting of on-board energy storage batteries, energy conversion modules, and external interfaces. These systems, through the combination of on-board energy storage batteries and bidirectional power conversion technology, enable bidirectional energy flow, thus charging electric vehicles.

[0054] The aforementioned vehicle-mounted energy storage system solution mainly relies on vehicle-mounted energy storage batteries for power. Once the battery capacity is insufficient, the system's range is limited in off-grid scenarios, making it difficult to continuously provide stable power to loads or electric vehicles.

[0055] An on-board energy storage system supporting external compensation introduces an external supplementary power interface on the basis of traditional on-board energy storage structures. Through the coordinated control of AC / DC modules, DC / DC modules, and V2G modules, it realizes flexible switching and energy interaction between energy storage batteries, electric vehicles, the power grid, and external supplementary power sources. This system can not only introduce photovoltaic, wind power, or other on-board batteries as supplementary power sources when battery capacity is insufficient, thereby extending driving range, but also automatically select the optimal energy path according to different scenarios, avoiding redundant energy conversion, improving overall operating efficiency, and ensuring stable power supply in both off-grid and grid-connected environments.

[0056] The following will combine Figure 1 This application provides a detailed description of an on-board storage system that supports external compensation.

[0057] like Figure 1 As shown, the vehicle-mounted storage system includes an AC bus and a DC bus;

[0058] An AC input terminal 101 and a first electric vehicle interface 102 are respectively provided at both ends of the AC bus.

[0059] An AC / DC module 204 is provided between the AC input terminal 101 and the first electric vehicle interface 102;

[0060] The AC / DC module 204 is used to realize bidirectional conversion between alternating current and direct current to ensure that the system can operate stably under different power supply conditions.

[0061] The DC bus is equipped with an energy storage battery 202 and a second electric vehicle interface 103 at both ends.

[0062] A DC / DC module 205 is provided between the energy storage battery 202 and the second electric vehicle interface 103;

[0063] The DC / DC module 205 is used to achieve matching and stabilization between different DC voltage levels, ensuring power regulation between the energy storage battery, electric vehicle and external power source.

[0064] The first electric vehicle interface 102 and the second electric vehicle interface 103 are electrically connected, and a sixth contactor 306 is provided between them to control the energy flow between the two interfaces.

[0065] The system includes a V2G module 201, which is electrically connected to the AC bus and DC bus. The V2G module 201 enables bidirectional energy exchange between the on-board energy storage battery and the power grid, thus supporting multi-mode operation of the system in grid-connected, off-grid, and grid dispatch scenarios. With this configuration, the system can serve as a charging port for electric vehicles and can also feed energy back to the grid when needed, improving the flexibility and utilization efficiency of the energy storage system.

[0066] The AC input terminal 101, the energy storage battery 202, the first electric vehicle interface 102, and the second electric vehicle interface 103 are respectively equipped with a first contactor 301, a second contactor 302, a seventh contactor 307, and an eighth contactor 308. With this configuration, the corresponding circuits can be selectively connected or disconnected according to different operating scenarios, thereby realizing flexible switching and safe control of the system power flow.

[0067] A no-load circuit is connected in parallel across the two ends of the DC / DC module 205, and a third contactor 303 is provided on the no-load circuit. A supplementary power supply 203 is connected in parallel to the DC bus, and the connection point of the supplementary power supply 203 and the bus is located on the side of the DC / DC module 205 near the energy storage battery 202, specifically between the DC / DC module 205 and the connection point of the no-load circuit and the DC bus; a fifth contactor 305 is provided on the access circuit of the supplementary power supply 203 to control the connection status between the supplementary power supply and the DC bus.

[0068] A fourth contactor 304 is also provided on the DC bus. The fourth contactor 304 is located between the connection point of the no-load circuit and the DC bus and the connection point of the supplementary power supply 203 and the DC bus. The fourth contactor 304 is used to switch the energy flow relationship between the DC bus and the supplementary power supply under different operating conditions, thereby ensuring the stability of the bus voltage and the rationality of energy dispatch.

[0069] The supplementary power supply 203 is used to provide additional power to the DC bus when the energy storage battery capacity is insufficient, so as to enhance the system's continuous power supply capability in off-grid or high-load scenarios, thereby effectively improving the system's reliability and endurance performance.

[0070] Furthermore, in some public designs, multiple electric vehicle interfaces can be set up and connected in parallel to the bus, with individual contactors installed.

[0071] Furthermore, in some disclosures, the system is equipped with a monitoring unit for real-time monitoring of the SOC status of the energy storage battery, the load status of the electric vehicle interface, and the output power of the supplementary power supply, and for controlling the connection or disconnection of the contactor based on the monitoring results.

[0072] Furthermore, such as Figure 2 As shown, the vehicle-mounted energy storage system disclosed herein supports external compensation and is applicable to various application scenarios such as energy storage battery charging, vehicle-mounted battery charging, electric vehicle charging, and discharging to the grid.

[0073] Energy storage battery charging scenarios

[0074] During the charging process of the energy storage battery, the system can dynamically select the charging strategy based on the external power supply access:

[0075] When the supplementary power source is connected to an external distributed power source (such as photovoltaic or wind power), the supplementary power source is used first to charge the energy storage battery. When the charging power is insufficient to meet the demand, the power can be supplemented through the AC input terminal via the AC / DC module and / or V2G module to ensure the charging power and charging efficiency of the energy storage battery.

[0076] When the supplementary power source is not connected to an external distributed power source, the system can still charge the energy storage battery through the AC / DC module and / or V2G module to maintain the charging power.

[0077] Onboard battery charging scenario

[0078] When an external vehicle battery is connected as a supplemental power source, the system provides the necessary power to the vehicle battery through a V2G module and / or an AC / DC module, enabling reliable charging of the vehicle battery.

[0079] Electric vehicle charging scenarios

[0080] The system can charge one or more electric vehicles, specifically including the following modes:

[0081] When the power grid is available:

[0082] When the supplementary power source is connected to the distributed power source, the distributed power source should be used first to charge the electric vehicle through the DC / DC module.

[0083] When the power of the distributed power source is insufficient to meet the charging demand, the system automatically activates the AC / DC module and / or V2G module to supplement the power.

[0084] Offline status:

[0085] When the supplemental power supply is connected to the vehicle battery, the system first charges the electric vehicle through the energy storage battery and the DC / DC module, while providing charging power through the V2G module and / or AC / DC module; when the energy storage battery reaches the discharge threshold, it switches to the vehicle battery to continue supplying power.

[0086] When the supplementary power supply is connected to the distributed power supply, the system determines the requested power, the output power of the distributed power supply, the rated output power of the DC / DC module, and the efficiency of each module based on the charging power request of one or more electric vehicles.

[0087] If the output power of the distributed power source is lower than or equal to the charging demand and efficiency loss threshold, the system uses the energy storage battery to activate the DC / DC module to charge the electric vehicle, and ensures the required power through the V2G module and AC / DC module.

[0088] If the output power of the distributed power source is higher than the charging demand and efficiency loss threshold but lower than the rated power of the DC / DC module, the system will only use the distributed power source to enable the DC / DC module to charge the electric vehicle. When the distributed power source is insufficient, it will be supplemented by the energy storage battery and V2G / AC / DC module. When the SOC of the energy storage battery reaches the discharge threshold, it will switch to the vehicle battery to continue to supply power.

[0089] If the output power of the distributed power source is greater than the rated power of the DC / DC module, the distributed power source and the energy storage battery work together to charge the electric vehicle, and the DC / DC, V2G and AC / DC modules are activated at the same time.

[0090] Discharging into the power grid

[0091] When the system discharges to the grid, when the supplementary power supply is connected to an external distributed power source, the distributed power source supplies power to the grid through a DC / DC module. At the same time, the energy storage battery and / or the external vehicle battery provide supplementary power through a V2G module to ensure that the overall discharge power meets the grid demand.

[0092] In some embodiments, the system operates as follows: Through the coordinated control of the AC bus, DC bus, and various power modules and contactors, the system achieves flexible energy scheduling across multiple scenarios. The specific operating logic includes the following typical scenarios:

[0093] 1) Energy storage battery 202 charging scenario:

[0094] If the supplementary power supply 203 is connected to an external distributed power source, including photovoltaic or wind power, this portion of the electrical energy will be used preferentially to charge the energy storage battery 202. The DC / DC module 205 will be activated, and the second contactor 302, third contactor 303, and fifth contactor 305 will close to charge the energy storage battery 202. The remaining modules of the system will be deactivated, and the remaining contactors will be open.

[0095] If the supplemental power supply cannot meet the charging power of the energy storage battery, and the AC input copper plate 101 is connected to the power grid and the power grid is in a normal power supply state, the V2G module 201 is used to increase the charging power of the energy storage battery. That is, the first contactor 301 is closed, the V2G module 201 is activated, and the second contactor 302 is closed to charge the energy storage battery. The other modules of the system are not activated, and the other contactors of the system are open.

[0096] If the V2G module 201 still cannot meet the current charging power of the energy storage battery, the first contactor 301 closes, the V2G module 201 is activated, and the second contactor 302 closes; the AC / DC module 204 is activated, and the sixth contactor 306 and the third contactor 303 (DC contactors) close to charge the energy storage battery. The remaining modules of the system are not activated, and the remaining contactors of the system are open.

[0097] 2) If the supplemental power source is connected to the vehicle battery, the corresponding vehicle battery charging scenario is as follows:

[0098] If V2G module 201 can meet the current charging power of the vehicle battery, and AC input copper plate 101 is connected to the power grid and the power grid is in a normal power supply state, the first contactor 301 closes, V2G module 201 is activated, and the fourth contactor 304 and the fifth contactor 305 close to charge the vehicle battery. The other modules in the system are not activated, and the other contactors in the system are open.

[0099] If the V2G module 201 cannot meet the current charging power of the vehicle battery, and the AC input copper plate 101 is connected to the power grid and the power grid is in a normal power supply state, the first contactor 301 closes, the V2G module 201 is activated, and the fourth contactor 304 and the fifth contactor 305 (DC contactors) close; the AC / DC module 204 is activated, and the sixth contactor 306 and the third contactor 303 (DC contactors) close to charge the energy storage battery 202. The remaining modules of the system are not activated, and the remaining contactors of the system are open.

[0100] 3) Primarily powered by AC mains electricity, for electric vehicle charging scenarios:

[0101] If a single electric vehicle is being charged, and the supplementary power supply 203 is connected to an external photovoltaic or wind power source, this portion of the electrical energy will be used preferentially to charge the electric vehicle. DC / DC module 205 will be activated, and the fifth contactor 305 (DC contactor) will be closed. If the electric vehicle is connected to the first electric vehicle interface 102, the sixth contactor 306 and the seventh contactor 307 will be closed, the remaining modules in the system will be deactivated, and the remaining contactors in the system will be open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 will be closed, the remaining modules in the system will be deactivated, and the remaining contactors in the system will be open.

[0102] If a single electric vehicle is being charged, and the supplemental power supply is insufficient to meet the charging power requirements, and the AC input copper plate 101 is connected to the power grid, with the grid in normal power supply mode, an AC / DC module is used to boost the charging power of the electric vehicle. AC / DC module 204 and DC / DC module 205 are activated, the first contactor 301 is closed, and the fifth contactor 305 and the sixth contactor 306 (DC contactors) are closed. If the electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 is closed, the remaining modules in the system are not activated, and the remaining contactors are open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 is closed, the remaining modules in the system are not activated, and the remaining contactors are open.

[0103] If a single electric vehicle is being charged, and the charging power is insufficient even after using the AC / DC module, the V2G module 201 is used to further increase the charging power. When V2G module 201, AC / DC module 204, and DC / DC module 205 are activated, the first contactor 301 closes, and the third, fifth, and sixth DC contactors 303, 305, and 306 close. If the electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 closes, the remaining modules in the system are not activated, and the remaining contactors in the system are open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 closes, the remaining modules in the system are not activated, and the remaining contactors in the system are open.

[0104] If two electric vehicles are charging, and the supplementary power supply 203 is connected to an external photovoltaic or wind power source, this electrical energy can charge the electric vehicle connected to the second electric vehicle interface 103. When the first contactor 301 closes, the AC / DC module 204 and DC / DC module 205 are activated, and the fifth contactor 305, seventh contactor 307, and eighth contactor 308 are closed. The remaining modules in the system are not activated, and the remaining contactors are open. The AC / DC module 204 provides charging power to the electric vehicle connected to the first electric vehicle interface 102.

[0105] If two electric vehicles are charging, and the supplemental power supply cannot meet the charging needs of the electric vehicle connected to the second electric vehicle interface 103, then the V2G module 201 is used to increase the charging power. The first contactor 301 closes, the V2G module 201 is activated, the AC / DC module 204 is activated, the DC / DC module 205 is activated, the third contactor 303, the fifth contactor 305, the seventh contactor 307, and the eighth contactor 308 are closed, the remaining modules of the system are not activated, and the remaining contactors of the system are open.

[0106] 4) Scenario of discharging into the power grid:

[0107] If the supplementary power supply 203 is connected to external photovoltaic or wind power, this portion of the power will be used for grid connection first. When the first contactor 301 is closed, the V2G module 201 is activated, the fourth contactor 304 and the fifth contactor 305 (DC contactors) are closed, the remaining modules of the system are not activated, and the remaining contactors of the system are open.

[0108] If the supplementary power supply cannot meet the grid-connected power, the energy storage battery 202 is added to discharge to the grid, the second contactor 302 is closed, the V2G module 201 is activated, the DC-DC module 205 is activated, the second contactor 302, the third contactor 303 and the fifth contactor 305 are closed, the other modules of the system are not activated, and the other contactors of the system are opened.

[0109] If the supplementary power supply 203 is connected to the vehicle battery, after the energy storage battery 202 discharges and reaches the SOC threshold, the vehicle battery will discharge to the grid. The first contactor 301 will close, the V2G module 201 will be activated, and the fourth contactor 304 and the fifth contactor 305 (DC contactors) will close. The remaining modules in the system will not be activated, and the remaining contactors will be open. This process continues until the vehicle battery's SOC reaches the discharge threshold.

[0110] 5) Off-grid scenario: If the supplementary power supply 203 is connected to the vehicle battery to charge the electric vehicle:

[0111] When charging a single electric vehicle, the charging power is preferentially provided by the DC / DC module 205. When the DC / DC module 205 is activated, the second contactor 302 and the fourth contactor 304 (DC contactors) are closed. If the electric vehicle is connected to the first electric vehicle interface 102, the sixth contactor 306 and the seventh contactor 307 are closed, the remaining modules in the system are not activated, and the remaining contactors are open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 is closed, the remaining modules in the system are not activated, and the remaining contactors are open. After the SOC of the energy storage battery 202 reaches the discharge threshold, the system switches to the on-board battery 203. The second contactor 302 and the fourth contactor 304 (DC contactors) are open, the fifth contactor 305 is closed, and the remaining modules and contactors remain unchanged until the SOC of the energy storage battery reaches the discharge threshold.

[0112] If a single electric vehicle is charging and the charging power exceeds the output power limit of the DC / DC module, the V2G module 201, AC / DC module 204, and DC / DC module 205 are activated, and the second contactor 302 and the fourth contactor 304 (DC contactors) are closed. If the electric vehicle is connected to the first electric vehicle interface 102, the sixth contactor 306 and the seventh contactor 307 are closed, the remaining modules in the system are not activated, and the remaining contactors in the system are open. If the electric vehicle is connected to the second electric vehicle interface 103, the sixth contactor 306 and the eighth contactor 308 are closed, the remaining modules in the system are not activated, and the remaining contactors in the system are open. When the SOC of the energy storage battery exceeds the discharge threshold, the system switches to the energy storage battery 202, the second contactor 302 and the fourth contactor 304 (DC contactors) are open, the seventh contactor 307 is closed, and the remaining modules and contactors in the system remain unchanged until the SOC of the energy storage battery reaches the discharge threshold.

[0113] If two electric vehicles are charging, component 320 and the fourth contactor 304 (DC contactor) close, DC / DC module 205 is activated, and the eighth contactor 308 closes to charge the electric vehicle connected to the second electric vehicle interface 103. V2G module 201 and AC / DC module 204 are activated, and the seventh contactor 307 closes to charge the electric vehicle connected to the first electric vehicle interface 102. Once the energy storage battery's SOC reaches the discharge threshold, the system switches to the energy storage battery. The second contactor 302 and the fourth contactor 304 (DC contactor) open, and the seventh contactor 307 closes. The remaining modules and contactors in the system remain unchanged until the energy storage battery's SOC reaches the discharge threshold.

[0114] 6) Off-grid scenario: If supplementary power is connected to external photovoltaic or wind power for charging electric vehicles:

[0115] If a single electric vehicle is being charged, let the electric vehicle request charging power. Photovoltaic or wind power output power DC / DC module rated output power V2G module efficiency AC / DC module efficiency .

[0116] like If the photovoltaic or wind power generation capacity is low, below the efficiency loss of charging via V2G and AC / DC modules, then photovoltaic or wind power is abandoned, and energy storage battery 202 is used to charge the electric vehicle. DC / DC module 205 is activated, and the second and fifth contactors 302 and 305 (DC contactors) are closed. If the electric vehicle is connected to the first electric vehicle interface 102, the sixth and seventh contactors 306 and 307 are closed, the remaining modules of the system are not activated, and the remaining contactors are open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 is closed, the remaining modules of the system are not activated, and the remaining contactors are open.

[0117] like When using photovoltaic or wind power to charge electric vehicles, DC / DC module 205 is activated, and the fifth contactor 305 (DC contactor) closes. If the electric vehicle is connected to the first electric vehicle interface 102, the sixth contactor 306 and the seventh contactor 307 close, the remaining modules in the system are not activated, and the remaining contactors in the system are open. If the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 closes, the remaining modules in the system are not activated, and the remaining contactors in the system are open. When the photovoltaic or wind power charging power cannot meet the charging needs of the electric vehicle, energy storage batteries are used for supplementation. V2G module 201 is activated, AC / DC module 204 is activated, and the second contactor 302 closes.

[0118] like If the photovoltaic or wind power generation capacity is low, photovoltaic or wind power will be abandoned. V2G module 201 will be activated, AC / DC module 204 will be activated, DC / DC module 205 will be activated, and DC contactors 302, 304, and 306 will be closed. If an electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 will be closed; if an electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 will be closed. The remaining modules in the system will not be activated, and the remaining contactors in the system will be open.

[0119] like When using photovoltaic or wind power to charge an electric vehicle, V2G module 201 is activated, AC / DC module 204 is activated, DC / DC module 205 is activated, and DC contactors 302, 305, and 306 are closed. If the electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 is closed; if the electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 is closed. The remaining modules in the system are not activated, and the remaining contactors in the system are open.

[0120] If two electric vehicles are charging simultaneously, and the output power of the photovoltaic or wind power is less than or equal to the charging threshold, the photovoltaic or wind power will be deactivated. V2G module 201 will be activated, AC / DC module 204 will be activated, DC / DC module 205 will be activated, and DC contactors 302, 304, and 306 will close. If an electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 will close; if an electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 will close. The remaining modules in the system will not be activated, and the remaining contactors will be open.

[0121] If two electric vehicles are charging simultaneously, and the output power of the photovoltaic or wind power exceeds the charging threshold, the photovoltaic or wind power will be used preferentially. V2G module 201 is activated, AC / DC module 204 is activated, DC / DC module 205 is activated, and DC contactors 302, 305, and 306 are closed. If an electric vehicle is connected to the first electric vehicle interface 102, the seventh contactor 307 is closed; if an electric vehicle is connected to the second electric vehicle interface 103, the eighth contactor 308 is closed. The remaining modules in the system are not activated, and the remaining contactors are open.

[0122] In this description, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0123] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vehicle-mounted storage system supporting external compensation, characterized in that, The system includes: AC bus, DC bus, V2G module and supplementary power supply; The AC bus is provided with an AC input terminal and an electric vehicle interface at both ends, and an AC / DC module is provided between the AC input terminal and the electric vehicle interface; The DC bus is equipped with energy storage batteries and electric vehicle interfaces at both ends, and a DC / DC module is provided between the energy storage batteries and the electric vehicle interfaces. The V2G module is electrically connected to the AC bus and the DC bus; Supplemental power supply, electrically connected to the DC bus, with its connection point located on the side of the DC / DC module closest to the energy storage battery; The DC / DC module is provided with an unloaded circuit at both ends. The two ends of the unloaded circuit are respectively connected to the DC bus on the side of the supplementary power supply near the energy storage battery and the DC bus on the other side of the DC / DC module. The system includes a sixth contactor disposed on a jumper harness between the AC bus and the DC bus, a seventh contactor disposed on the first electric vehicle interface and the second electric vehicle interface, and an eighth contactor disposed between the second electric vehicle interface and the DC bus. The sixth, seventh, and eighth contactors are used to control the electrical connection status between the AC bus, DC bus, first electric vehicle interface, and second electric vehicle interface, so as to realize the bridging connection or disconnection between the AC bus and the DC bus. When the system is off-grid, the supplementary power supply connects to the vehicle battery, first charging the electric vehicle through the energy storage battery and DC / DC module, and providing charging power through the V2G module and AC / DC module; when the energy storage battery SOC reaches the discharge threshold, it switches to the vehicle battery. When supplementing power is connected to distributed power, the requested charging power, the output power of the distributed power, the rated output power of the DC / DC module, the efficiency of the V2G module, and the efficiency of the AC / DC module are determined based on the charging power request of one or more electric vehicles. When the output power of the distributed power source is lower than or equal to the charging demand and efficiency loss threshold, the energy storage battery is used to enable the DC / DC module to charge the electric vehicle, and the power is guaranteed by the V2G module and AC / DC module. When the output power of the distributed power source is higher than the charging demand and efficiency loss threshold but lower than the rated power of the DC / DC module, the DC / DC module is activated only by the distributed power source to charge the electric vehicle; when the power of the distributed power source is insufficient, it is supplemented by the energy storage battery through the V2G module and the AC / DC module; when the SOC of the energy storage battery reaches the discharge threshold, it switches to the vehicle battery. When the output power of the distributed power source exceeds the rated power of the DC / DC module, the distributed power source and the energy storage battery work together to charge the electric vehicle, activating the DC / DC, V2G and AC / DC modules.

2. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, The types of supplementary power sources include one or more of photovoltaic power sources, wind turbines, or external vehicle batteries.

3. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, A contactor is provided between the unloaded circuit and the DC bus connection point near the energy storage battery side, and between the supplementary power supply and the DC bus connection point.

4. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, The system is equipped with a monitoring unit for real-time monitoring of the SOC status of the energy storage battery, the load status of the electric vehicle interface, and the output power of the supplementary power supply, and controls the connection or disconnection of the contactor based on the monitoring results.

5. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, The application scenarios for the vehicle-mounted storage system include: In the scenario of charging an energy storage battery, when the supplementary power supply is connected to an external distributed power supply, the supplementary power supply is used first to charge the energy storage battery. When the supplementary power supply cannot meet the charging requirements of the energy storage battery, the energy storage battery is charged via the AC input terminal through the AC / DC module and / or the V2G module. In the scenario of charging a vehicle battery, when the supplementary power source is connected to the vehicle battery, it provides power to the vehicle battery through the V2G module and / or AC / DC module; In the scenario of discharging into the grid, the power is discharged into the grid through supplementary power supply and / or energy storage batteries; In electric vehicle charging scenarios, electric vehicles are charged through one or more of the DC / DC module, AC / DC module, and V2G module. When the power grid is available, and a distributed power source is connected to the supplementary power interface, the distributed power source is used first to charge the electric vehicle through the DC / DC module. When the power of the distributed power source is insufficient, the AC / DC module and / or V2G module are activated to supplement the power.

6. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, The specific execution steps for the energy storage battery charging scenario are as follows: Set the charging power and charge the energy storage battery. When the supplementary power supply is connected to a distributed power source, the distributed power source charges the energy storage battery, and the charging power is guaranteed by the V2G module and / or AC / DC module. When there is no external distributed power source for the supplementary power supply, the charging power is guaranteed through the V2G module and / or AC / DC module.

7. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, When the supplementary power supply is connected to an external vehicle battery, it charges the energy storage battery through a V2G module and / or AC / DC.

8. The vehicle-mounted storage system supporting external compensation according to claim 1, characterized in that, When the system discharges to the grid, the specific steps are as follows: when the supplementary power source is connected to a distributed power source, the distributed power source discharges to the grid through a DC / DC module, and discharges to the grid through a storage battery and / or an external vehicle battery via a V2G module to ensure power.

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