Intelligent charger system and method based on multi-bus cooperation

Abstract

The invention relates to the technical field of chargers, and discloses an intelligent charger system and method based on multi-bus cooperation, and the system comprises a multi-bus setting module, a multi-bus cooperation module, a flexible selection module, and a charging output module. The method corresponds to the system. According to the application, through the collaborative design of arranging multiple groups of direct current buses, successively accessing to match the load power, flexibly selecting the power supply source and directionally converting the output, not only is the adaptation problem of fixed power of the traditional single bus solved, but also the commercial power and the energy storage power supply can be flexibly allocated, and the dual optimization of power dynamic response and economy is realized; and the scene adaptability of the charger is greatly improved.

Description

Technical Field

[0001] This application relates to the field of charger technology, specifically an intelligent charger system and method based on multi-bus coordination. Background Technology

[0002] With the increasing popularity of rechargeable vehicles such as new energy vehicles and agricultural machinery, higher demands are being placed on the power adaptability, economy, and safety of chargers. Most existing chargers adopt a single DC bus design with fixed power output, making it difficult to dynamically match the real-time power demands of different loads. This results in either insufficient power to meet fast charging requirements or energy waste due to power redundancy.

[0003] Meanwhile, the choice of power source is rigid, relying mostly on mains power or single energy storage, and cannot be flexibly adjusted according to cost and load. Furthermore, the external port has poor compatibility and lacks targeted safety protection, making it easy for equipment to be damaged due to voltage mismatch or sudden failure.

[0004] In addition, multiple chargers cannot share energy storage devices, resulting in high system deployment costs and difficulty in meeting the needs of large-scale charging scenarios.

[0005] Chinese invention patent application CN105576772A discloses an energy storage charging system, but it uses a single DC bus, and the energy storage is only passively supplemented when the mains power is insufficient. It cannot dynamically match the power demand of multiple loads, and it lacks a wide voltage compatibility port and modular expansion design. The power source selection is not flexible enough, and it is difficult to balance economy and multi-scenario adaptability.

[0006] In conclusion, there is an urgent need for a new technical solution for intelligent chargers based on multi-bus collaboration. Summary of the Invention

[0007] The purpose of this application is to provide an intelligent charger system and method based on multi-bus collaboration to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, this application discloses the following technical solutions:

[0009] In a first aspect, this application discloses an intelligent charger system based on multi-bus coordination, the system comprising:

[0010] A multi-bus setting module is used to set up multiple sets of DC buses. The DC buses are connected to a DC power supply, which includes the energy storage DC power supply output by the energy storage device and the mains rectified power supply obtained by converting mains power.

[0011] The multi-bus coordination module is used to monitor the real-time power demand of the load and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected buses meets the real-time power demand.

[0012] The flexible selection module is used to select the corresponding power supply source for each group of DC buses that have been connected to the power supply circuit. The power supply source is the energy storage DC power supply or the mains rectifier power supply.

[0013] The charging output module is used to convert the electrical energy output from each DC bus into electrical energy that is adapted to the load, and output it through the charging output terminal to charge the load.

[0014] Preferably, the DC bus is connected to the DC power supply through an independent DC external port. Each DC external port corresponds to one DC bus. Each set of DC external ports can be connected to the energy storage DC power supply or the mains rectifier power supply, and supports power supply access in the voltage range of 200 to 1200V to adapt to different types of energy storage devices.

[0015] Preferably, the DC external port is equipped with a safety protection circuit, which includes at least an anti-reverse circuit, an anti-surge circuit, and an overcurrent protection circuit.

[0016] Preferably, the system is equipped with a modular interface for connecting the system to at least one other charger so that multiple chargers can share the same set of energy storage devices.

[0017] Preferably, the system also includes an energy storage charging control module, which controls the charging process of the mains rectifier power supply for the energy storage device. When it is during off-peak hours, the energy storage charging control module starts the charging program and connects the mains rectifier power supply to the energy storage device through the DC bus until the energy storage device reaches the preset power level.

[0018] Preferably, the energy storage charging control module adjusts charging parameters based on the stability of the mains voltage and the status of the energy storage device, including:

[0019] When the mains voltage fluctuation is within the allowable range and the energy storage device has a low power level, multiple sets of the DC bus are connected based on the multi-bus coordination module to improve the charging power.

[0020] When the mains voltage fluctuation is outside the allowable range or the energy storage device’s power is close to the preset power, the number of connected DC buses is reduced based on the multi-bus coordination module to reduce the charging power.

[0021] Preferably, the flexible selection module further includes an index determination unit, which is used to calculate the matching index between comprehensive cost and power.

[0022] The matching index is a weighted combination of cost ratio and power ratio; wherein, the cost ratio is the ratio of the cost of using the mains rectifier power supply per unit time to the cost of using the energy storage DC power supply, and the power ratio is the ratio of the current load's real-time power demand to the maximum total output power. The weighted combination is to combine the cost ratio and the power ratio into a single index based on preset weights, and define the balance state between cost and power demand based on this single index.

[0023] Preferably, the cost of using the mains rectifier power supply per unit time is determined based on the mains electricity price and the real-time output power of the mains rectifier power supply; wherein, the mains electricity price is determined based on the power company's peak-valley-normal periods.

[0024] The cost of using the energy storage DC power supply per unit time is determined based on the unit energy cost of the energy storage device and the real-time output power of the energy storage DC power supply; wherein, the unit energy cost is determined based on the purchase cost, maintenance cost and charge / discharge loss of the energy storage device.

[0025] Preferably, the flexible selection module adjusts the power supply source ratio of the DC bus based on the matching index, including:

[0026] When the matching index is biased towards lower cost, increase the number of DC buses connected to the mains rectifier power supply;

[0027] When the matching index is biased towards higher power demand, the number of DC buses connected to the energy storage DC power supply is increased.

[0028] Secondly, this application discloses a method for a smart charger based on multi-bus cooperation, applied to the smart charger system based on multi-bus cooperation as described above. The method includes the following steps:

[0029] Step 1: Set up multiple DC buses, which are connected to a DC power supply. The DC power supply includes the energy storage DC power output from the energy storage device and the mains rectified power supply obtained by converting mains power.

[0030] Step 2: Monitor the real-time power demand of the load, and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected bus meets the real-time power demand.

[0031] Step 3: For each group of DC buses that have been connected to the power supply circuit, select the corresponding power supply source, wherein the power supply source is the energy storage DC power supply or the mains rectifier power supply;

[0032] Step 4: Convert the electrical energy output from each DC bus into electrical energy suitable for the load, and output it through the charging output terminal to charge the load.

[0033] Beneficial Effects: The intelligent charger system and method based on multi-bus collaboration in this application achieves dynamic matching of the real-time power demand of the load through the successive connection of multiple DC buses, solving the problem that traditional chargers with fixed power cannot adapt to diverse charging scenarios, and supporting output from low power to megawatt-level high power; the DC external port is compatible with a wide voltage range of 200-1200V and integrates multiple safety protections, improving equipment compatibility and operational safety; the modular interface enables multiple units to share energy storage devices, reducing system deployment costs; the energy storage charging control module combines peak-valley electricity pricing for charging; the flexible selection module dynamically adjusts the power supply source based on cost and power matching indicators, significantly reducing electricity costs and achieving a balance between peak shaving and valley filling and power response; thus, through multi-dimensional collaborative optimization, it achieves a balance between charger charging efficiency, economy, and safety. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A structural block diagram of a smart charger system based on multi-bus coordination provided in an embodiment of this application;

[0036] Figure 2 A flowchart illustrating the intelligent charger method based on multi-bus collaboration provided in this application embodiment. Detailed Implementation

[0037] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Example 1

[0040] In the field of chargers, such as charging piles and charging stacks, traditional equipment often adopts a single DC bus architecture with fixed power output, making it difficult to cope with real-time power fluctuations under different loads, such as rechargeable transportation vehicles like new energy vehicles and agricultural machinery. When the load power suddenly increases, insufficient power can easily lead to charging interruptions; when the load power is low, power redundancy can result in energy waste. Meanwhile, the power source selection of existing equipment is rigid, often relying on mains power or a single energy storage source, unable to flexibly switch according to the scenario. This makes it difficult to adapt to a wide range of load demands and also fails to balance electricity costs and charging efficiency. This embodiment, through a collaborative design of setting up multiple DC buses, connecting them sequentially to match load power, flexibly selecting power sources, and directional output conversion, not only solves the adaptation problem of the fixed power of traditional single buses but also flexibly allocates mains power and energy storage power, achieving dual optimization of dynamic power response and economy, and significantly improving the charger's scenario adaptability.

[0041] like Figure 1 As shown, this embodiment discloses an intelligent charger system based on multi-bus coordination, the system comprising:

[0042] The multi-bus setting module is used to set up multiple DC buses. The DC buses are connected to DC power supplies, which include the energy storage DC power output from the energy storage device and the mains rectified power supply obtained by converting mains power.

[0043] The multi-bus coordination module is used to monitor the real-time power demand of the load and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected buses meets the real-time power demand.

[0044] The flexible selection module is used to select the corresponding power source for each group of DC buses that have been connected to the power supply circuit. The power source is either an energy storage DC power supply or a mains rectified power supply.

[0045] The charging output module is used to convert the electrical energy output from each DC bus into electrical energy that is adapted to the load, and output it through the charging output terminal to charge the load.

[0046] Existing chargers often suffer from insufficient compatibility with their DC power input ports. On one hand, the ports and buses are often not designed in a one-to-one correspondence, leading to confusion regarding power input. On the other hand, the narrow voltage range of the ports makes it difficult to accommodate the output voltages of different types of energy storage devices, such as 200V low-voltage energy storage and 1200V high-voltage energy storage, thus limiting the applicable scenarios for the devices. Furthermore, some ports only support a single type of power input, such as mains power only or energy storage only, making flexible switching impossible and reducing the system's power supply flexibility. This embodiment addresses this by using independent external DC ports with a one-to-one correspondence to the DC bus, and each set of ports supports energy storage DC power or mains rectified power input within a wide voltage range of 200–1200V. This avoids confusion in power input and significantly broadens the power compatibility range, enabling the system to be compatible with various energy storage devices and mains input, thus improving the device's versatility. By connecting an external DC energy storage port, the charger's output power can be easily increased, readily reaching megawatt-level or higher charging gun output power, meeting the demands of high-power fast charging.

[0047] Specifically, the DC bus is connected to the DC power supply through independent DC external ports. Each DC external port corresponds to a DC bus, and each set of DC external ports can be connected to either an energy storage DC power supply or a mains rectifier power supply. It also supports power supply access in the voltage range of 200 to 1200V to adapt to different types of energy storage devices.

[0048] In one specific application of this embodiment, the rectifier module and inverter module of the charger are designed separately. The DC external port power supply voltage is basically the same as the mains rectified voltage of the charger, so when the DC power supply (including energy storage DC power supply and mains rectified power supply) of the charger is connected, it can be smoothly connected to the charger system. At the same time, the charger is equipped with micro-voltage rectification measures to ensure that the voltage used for inverter is consistent with the voltage connected to the charger, thus ensuring the stability and compatibility of the power conversion process.

[0049] In large-scale charging scenarios, such as charging stations, configuring energy storage devices independently for multiple chargers leads to redundant investment, low utilization of energy storage resources, and increased system deployment costs. Existing chargers lack standardized collaborative interfaces, making it difficult to share energy storage devices among multiple chargers, and resource waste easily occurs when each device operates independently. This embodiment addresses this by setting up a modular interface, allowing multiple chargers to physically connect and share the same set of energy storage devices, while simultaneously enabling the exchange of information such as energy storage status and load requirements. This design not only reduces the cost of repeatedly purchasing energy storage devices but also improves energy storage utilization through resource coordination, meeting the cost reduction and efficiency improvement needs of large-scale charging scenarios.

[0050] Specifically, the system is equipped with a modular interface, which allows the system to connect to at least one other charger so that multiple chargers can share the same set of energy storage devices.

[0051] The charging cost of energy storage devices is a key factor affecting the economic efficiency of charger operation. Existing chargers often do not differentiate between electricity price periods, frequently charging during peak hours (when electricity prices are higher), leading to persistently high energy storage costs. Furthermore, some devices lack precise control over the amount of energy stored, easily resulting in overcharging or undercharging, affecting the lifespan of the energy storage device and the stability of the power supply. This embodiment adds an energy storage charging control module that can identify off-peak hours (when electricity prices are lower) and initiate the charging program during these periods. The mains rectified power supply is connected to the energy storage device via the DC bus until the preset amount of energy is reached. This design utilizes low-priced electricity to reduce energy storage costs while preventing overcharging through preset amount control, thus balancing economic efficiency and energy storage device protection.

[0052] Specifically, the system also includes an energy storage charging control module, which controls the process of the mains rectified power supply charging the energy storage device. When it is during off-peak hours, the energy storage charging control module starts the charging program and connects the mains rectified power supply to the energy storage device through the DC bus until the energy storage device reaches the preset power level.

[0053] When selecting a power source, chargers need to balance cost and power requirements. However, existing technologies lack quantitative indicators and rely heavily on experience-based judgments, which can easily lead to an imbalance between cost and power requirements. For example, considering only the mains electricity price may result in wasted power redundancy during peak hours, while focusing solely on power requirements may overlook the surge in energy storage costs. In this embodiment, an indicator determination unit of the flexible selection module is added. This unit aims to calculate a comprehensive cost-power matching index, merging the cost ratio and power ratio into a single index with preset weights. This provides a quantitative basis for power source selection, accurately defining the balance between cost and power, avoiding the subjectivity of experience-based judgments, and making the power supply strategy more scientific.

[0054] Specifically, the flexible selection module also includes an index determination unit, which is used to calculate the matching index between overall cost and power.

[0055] The matching index is a weighted combination of cost ratio and power ratio; where cost ratio is the ratio of the cost of using mains rectifier power supply per unit time to the cost of using energy storage DC power supply, and power ratio is the ratio of the current load's real-time power demand to the maximum total output power. The weighted combination means that the cost ratio and power ratio are combined into a single index based on preset weights, and the balance between cost and power demand is defined based on this single index.

[0056] In practical applications, when a charger is connected to a DC power source, it is prone to damage or even safety accidents due to incorrect external power polarity, instantaneous power surges, or circuit overcurrent. Existing protection measures are often quite limited. This embodiment integrates an anti-reverse phase circuit, an anti-surge circuit, and an overcurrent protection circuit at the DC external port. The anti-reverse phase circuit detects and blocks incorrectly polarized power input, the anti-surge circuit absorbs instantaneous high voltage, and the overcurrent protection circuit cuts off the circuit after the current exceeds the limit. This triple protection comprehensively reduces the safety risks associated with power connection and ensures stable equipment operation.

[0057] Specifically, the DC external port is equipped with a safety protection circuit, which includes at least a reverse phase protection circuit, a surge protection circuit, and an overcurrent protection circuit.

[0058] In practical applications, existing chargers often use a fixed power mode when charging energy storage devices, which is difficult to handle complex operating conditions. When the mains voltage fluctuates significantly, fixed high-power charging may cause circuit overload; when the energy storage device is close to full charge, fixed power charging is prone to overcharging; and when the energy storage device has a low charge, fixed low-power charging will prolong charging time and reduce efficiency. In this embodiment, the energy storage charging control module can dynamically adjust the number of connected DC buses based on the mains voltage stability and the energy storage device status through a multi-bus coordination module. When the voltage is stable and the energy storage capacity is low, multiple sets of buses are connected to increase power and shorten the time; when the voltage fluctuates or the energy storage is close to full charge, fewer buses are connected to reduce power and avoid risks. This dynamic adjustment mechanism significantly improves charging efficiency and safety.

[0059] Specifically, the energy storage charging control module adjusts charging parameters based on the stability of the mains voltage and the status of the energy storage device, including:

[0060] When the mains voltage fluctuation is within the allowable range and the energy storage device has a low power level, multiple DC buses can be connected based on the multi-bus collaborative module to improve the charging power.

[0061] When the mains voltage fluctuations are outside the allowable range or the energy storage device's power is close to the preset power, the number of connected DC buses is reduced based on the multi-bus collaborative module to reduce charging power.

[0062] Based on the aforementioned design that balances cost and power requirements, this embodiment addresses the issue of unclear cost structure in existing chargers when calculating power supply costs by clarifying the cost calculation basis for both the mains rectifier power supply and the energy storage DC power supply per unit time. This detailed cost structure design ensures the accuracy of the overall cost and power matching indicators, providing a reliable data foundation for flexibly selecting power sources and avoiding strategy deviations caused by rough cost calculations.

[0063] Specifically, the cost of using a mains rectifier power supply per unit time is determined based on the mains electricity price and the real-time output power of the mains rectifier power supply; whereby the mains electricity price is determined based on the power company's peak-valley-normal-time periods.

[0064] The cost of using a DC power storage device per unit time is determined based on the unit energy cost of the energy storage device and the real-time output power of the DC power storage device; wherein, the unit energy cost is determined based on the purchase cost, maintenance cost and charge / discharge loss of the energy storage device.

[0065] Furthermore, existing technologies often rely on manual settings or simple thresholds when adjusting the power supply ratio of the DC bus, making it difficult to accurately optimize based on dynamic changes in cost and power demand. For example, a fixed 60% mains power and 40% energy storage ratio may not be sufficient to reduce costs when mains power prices change, or to compensate for power surges when load power increases. In this embodiment, the flexible selection module adjusts the ratio based on matching indicators. When the indicators favor low cost, the number of buses connected to the mains rectifier power supply is increased; when the indicators favor high power demand, the number of buses connected to the energy storage DC power supply is increased. This dynamic adjustment mechanism allows the power supply ratio to adapt to changes in the scenario in real time, further improving the system's operational economy and power response capability.

[0066] Specifically, the flexible selection module adjusts the power supply source ratio of the DC bus based on matching indicators, including:

[0067] When the matching indicators are biased towards lower costs, increase the number of DC buses connected to the mains rectifier power supply;

[0068] When the matching index is biased towards higher power demand, increase the number of DC buses connected to the energy storage DC power supply.

[0069] In one specific application of this embodiment, the initial weights for the cost ratio and power ratio are set to 0.5 and 0.5, respectively. These weights can be dynamically adjusted based on the scenario. For example, the cost weight can be increased when electricity prices switch time periods, and the power weight can be increased when the rechargeable transport vehicle can handle higher load power, thus adapting to different priority requirements.

[0070] When the cost ratio is higher in the weighted combination, causing the value of the matching indicator to be less than the preset balance threshold, it is judged as biased towards low cost. At this time, the cost advantage of the mains power is more significant, and the trend should be to reduce the overall cost by increasing the number of mains power supply buses.

[0071] When the power ratio accounts for a higher proportion in the weighted combination, causing the value of the matching index to exceed the preset balance threshold, it is judged as biased towards high power demand. At this time, the load has a more urgent need for power, and the trend should be to prioritize increasing the number of energy storage power supply buses to quickly match the power demand.

[0072] Example 2

[0073] like Figure 2 As shown, this embodiment discloses a method for a smart charger based on multi-bus cooperation, applied to the smart charger system based on multi-bus cooperation as described above. The method includes the following steps:

[0074] Step 1: Set up multiple DC buses, and connect the DC buses to a DC power supply. The DC power supply includes the energy storage DC power output from the energy storage device and the mains rectified power supply obtained by converting mains power.

[0075] Step 2: Monitor the real-time power demand of the load, and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected bus meets the real-time power demand.

[0076] Step 3: For each DC bus that has been connected to the power supply circuit, select the corresponding power supply source, which can be either an energy storage DC power supply or a mains rectifier power supply.

[0077] Step 4: Convert the electrical energy output from each DC bus into electrical energy suitable for the load, and output it through the charging output terminal to charge the load.

[0078] It should be noted that the intelligent charger method based on multi-bus coordination in this embodiment corresponds to the aforementioned intelligent charger system based on multi-bus coordination. Therefore, any content not specifically described in the intelligent charger system based on multi-bus coordination in this embodiment, including but not limited to functional definitions, working principles, and technical effects, can be referred to the description in the aforementioned intelligent charger system based on multi-bus coordination, and will not be repeated here.

[0079] In summary, the intelligent charger system and method based on multi-bus collaboration in this embodiment achieves dynamic matching of the real-time power demand of the load through the successive connection of multiple DC buses, solving the problem that traditional chargers with fixed power cannot adapt to diverse charging scenarios, and supporting output from low power to megawatt-level high power; the DC external port is compatible with a wide voltage range of 200-1200V and integrates multiple safety protections, improving equipment compatibility and operational safety; the modular interface enables multiple units to share energy storage devices, reducing system deployment costs; the energy storage charging control module combines peak-valley electricity pricing for charging; the flexible selection module dynamically adjusts the power supply source based on cost and power matching indicators, significantly reducing electricity costs and achieving a balance between peak shaving and valley filling and power response; thus, through multi-dimensional collaborative optimization, it achieves a balance between charger charging efficiency, economy, and safety.

[0080] In the embodiments provided in this application, it should be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For hardware implementation, the processor may be implemented in one or more of the following: application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to implement the functions described herein, or combinations thereof. For software implementation, some or all of the processes of the embodiments may be performed by a computer program instructing the associated hardware. During implementation, the program may be stored in a computer-readable storage medium or transmitted as one or more instructions or code on a computer-readable storage medium. Computer-readable storage media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media may be any available medium accessible to a computer. Computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code having the form of instructions or data structures and accessible to a computer.

[0081] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A smart charger system based on multi-bus coordination, characterized in that, The system includes: A multi-bus setting module is used to set up multiple sets of DC buses. The DC buses are connected to a DC power supply, which includes the energy storage DC power supply output by the energy storage device and the mains rectified power supply obtained by converting mains power. The multi-bus coordination module is used to monitor the real-time power demand of the load and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected buses meets the real-time power demand. The flexible selection module is used to select the corresponding power supply source for each group of DC buses that have been connected to the power supply circuit. The power supply source is the energy storage DC power supply or the mains rectifier power supply. The charging output module is used to convert the electrical energy output from each DC bus into electrical energy that is adapted to the load, and output it through the charging output terminal to charge the load.

2. The intelligent charger system based on multi-bus coordination according to claim 1, characterized in that, The DC bus is connected to the DC power supply through an independent DC external port. Each DC external port corresponds to a DC bus. Each set of DC external ports can be connected to the energy storage DC power supply or the mains rectifier power supply, and supports power supply access in the voltage range of 200 to 1200V to adapt to different types of energy storage devices.

3. The intelligent charger system based on multi-bus coordination according to claim 2, characterized in that, The DC external port is equipped with a safety protection circuit, which includes at least an anti-reverse circuit, an anti-surge circuit, and an overcurrent protection circuit.

4. The intelligent charger system based on multi-bus coordination according to claim 1, characterized in that, The system is equipped with a modular interface that allows the system to connect to at least one other charger so that multiple chargers can share the same set of energy storage devices.

5. The intelligent charger system based on multi-bus coordination according to claim 1, characterized in that, The system also includes an energy storage charging control module, which controls the charging process of the mains rectifier power supply for the energy storage device. When it is during off-peak hours, the energy storage charging control module starts the charging program and connects the mains rectifier power supply to the energy storage device through the DC bus until the energy storage device reaches the preset power level.

6. The intelligent charger system based on multi-bus coordination according to claim 5, characterized in that, The energy storage charging control module adjusts charging parameters based on the stability of the mains voltage and the status of the energy storage device, including: When the mains voltage fluctuation is within the allowable range and the energy storage device has a low power level, multiple sets of the DC bus are connected based on the multi-bus coordination module to improve the charging power. When the mains voltage fluctuation is outside the allowable range or the energy storage device’s power is close to the preset power, the number of connected DC buses is reduced based on the multi-bus coordination module to reduce the charging power.

7. The intelligent charger system based on multi-bus coordination according to claim 1, characterized in that, The flexible selection module also includes an index determination unit, which is used to calculate the matching index between comprehensive cost and power. The matching index is a weighted combination of cost ratio and power ratio; wherein, the cost ratio is the ratio of the cost of using the mains rectifier power supply per unit time to the cost of using the energy storage DC power supply, and the power ratio is the ratio of the current load's real-time power demand to the maximum total output power. The weighted combination is to combine the cost ratio and the power ratio into a single index based on preset weights, and define the balance state between cost and power demand based on this single index.

8. The intelligent charger system based on multi-bus coordination according to claim 7, characterized in that, The cost of using the mains rectifier power supply per unit time is determined based on the mains electricity price and the real-time output power of the mains rectifier power supply; wherein, the mains electricity price is determined based on the power company's peak-valley-normal period. The cost of using the energy storage DC power supply per unit time is determined based on the unit energy cost of the energy storage device and the real-time output power of the energy storage DC power supply; wherein, the unit energy cost is determined based on the purchase cost, maintenance cost and charge / discharge loss of the energy storage device.

9. The intelligent charger system based on multi-bus coordination according to claim 8, characterized in that, The flexible selection module adjusts the power supply source ratio of the DC bus based on the matching index, including: When the matching index is biased towards lower cost, increase the number of DC buses connected to the mains rectifier power supply; When the matching index is biased towards higher power demand, the number of DC buses connected to the energy storage DC power supply is increased.

10. A method for a smart charger based on multi-bus cooperation, applied to the smart charger system based on multi-bus cooperation as described in any one of claims 1-9, characterized in that, The method includes the following steps: Step 1: Set up multiple DC buses, which are connected to a DC power supply. The DC power supply includes the energy storage DC power output from the energy storage device and the mains rectified power supply obtained by converting mains power. Step 2: Monitor the real-time power demand of the load, and connect the DC bus to the power supply circuit one by one based on the real-time power demand until the total power of the connected bus meets the real-time power demand. Step 3: For each group of DC buses that have been connected to the power supply circuit, select the corresponding power supply source, wherein the power supply source is the energy storage DC power supply or the mains rectifier power supply; Step 4: Convert the electrical energy output from each DC bus into electrical energy suitable for the load, and output it through the charging output terminal to charge the load.

Images