An energy optimization distribution system for adaptive photovoltaic power generation system

Abstract

The present invention provides an energy optimization distribution system for an adaptive photovoltaic power generation system, which belongs to the technical field of power systems. The distribution system includes a high-level energy storage unit, a low-level energy storage unit, a transportation device and a plurality of independent energy storage blocks. The high-level energy storage unit is charged by the photovoltaic power generation system and provides power for the transportation device; the energy storage block is lifted from the low-level energy storage unit to the high-level energy storage unit through a conveyor belt, and after charging is completed, it is returned to the low-level energy storage unit through the transportation device. In this process, the transportation device is equipped with an energy recovery unit, which can convert the gravitational potential energy of the energy storage block during the descent process into electrical energy and store it. In addition, the system uses a DC / DC converter to perform independent voltage and power control for each energy storage block, ensuring efficient management under different charging states, and flexible power distribution through constant power mode and droop mode, thereby realizing efficient management and energy storage of the photovoltaic power generation system.

Description

Technical Field

[0001] The present invention belongs to the field of digital information technology, and in particular relates to an energy optimization distribution system for an adaptive photovoltaic power generation system. Background Art

[0002] With the development of technology, photovoltaic power generation has been widely used in special environments such as remote areas or the seabed, especially for the charging needs of unmanned mobile devices. Usually, photovoltaic power generation systems are mostly set up on the top of a mountain or on the water surface at a high altitude to obtain better photovoltaic power generation conditions, but the working area of unmanned mobile devices may be located at the foot of a mountain or on the seabed at a lower altitude. Therefore, in order to charge these devices, it is necessary to solve the problem of geographical height difference between the charging facilities and the equipment. The traditional method is to move the unmanned equipment to a high-altitude area for charging. However, this requires the equipment to move a long distance, resulting in reduced efficiency. Another method is to transmit electricity to a lower altitude area through a long-distance cable, but because it is difficult to use high-voltage transmission, long-distance transmission will cause large energy loss. These problems show that how to achieve efficient and low-loss electricity transmission in special environments is a technical problem that needs to be solved urgently. The present invention provides a more efficient charging solution for unmanned mobile devices through intelligent energy storage and optimized energy distribution.

[0003] According to relevant public technologies, publication number CN113104216B proposes a lamp pole that can be used for charging drones, which allows the drone to be charged at the top of the lamp pole; the technical solution with publication number US20170029078A1 proposes an unmanned boat with a detachable battery, which achieves a longer cruising distance in a modular manner; the technical solution with publication number JP2010088215A proposes a charging solution suitable for unmanned vehicles, which enables unmanned vehicles to automatically complete the self-charging process by setting up charging stations.

[0004] The above technical solutions all propose several charging systems or methods for unmanned mobile work. However, for application scenarios where the power grid in remote areas is not well-equipped or only renewable energy is used as a way to obtain electricity, there are currently few technical solutions that propose systems with high adaptability and good charging effects.

[0005] The foregoing discussion of the background art is intended only to facilitate an understanding of the present invention. This discussion does not acknowledge or admit that any of the material referred to is part of the common general knowledge. Summary of the Invention

[0006] The purpose of the present invention is to provide an energy optimization distribution system for an adaptive photovoltaic power generation system, which belongs to the field of power system technology. The distribution system includes a high-level energy storage part, a low-level energy storage part, a transportation device and a plurality of independent energy storage blocks. The high-level energy storage part is charged by the photovoltaic power generation system and provides power for the transportation device; the energy storage block is lifted from the low-level energy storage part to the high-level energy storage part by a conveyor belt, and after charging is completed, it is returned to the low-level energy storage part by the transportation device. In this process, the transportation device is equipped with an energy recovery unit, which can convert the gravitational potential energy of the energy storage block during the descent process into electrical energy and store it. In addition, the system uses a DC / DC converter to perform independent voltage and power control for each energy storage block, ensuring efficient management under different charging states, and flexible power distribution through constant power mode and droop mode, realizing efficient management and energy storage of the photovoltaic power generation system.

[0007] The present invention adopts the following technical solution: an energy optimization distribution system for an adaptive photovoltaic power generation system, wherein the distribution system establishes a circuit connection with an existing photovoltaic power generation system and is capable of distributing the electric energy generated by the photovoltaic power generation system; the distribution system includes a high-level energy storage unit, a low-level energy storage unit, a transport device disposed between the high-level and low-level energy storage units, and a plurality of energy storage blocks;

[0008] The high-level energy storage unit is deployed at a higher altitude than the low-level energy storage unit and is connected to the existing photovoltaic power generation system circuit to receive the electric energy generated by the photovoltaic power generation system;

[0009] The low-level energy storage unit is deployed as a distribution center for energy storage blocks;

[0010] Each energy storage block is an independent entity and is equipped with a standard electrical interface. After being received by the low-level energy storage unit, the energy storage block enters the transport device according to a control instruction, and the transport device performs an ascending stroke to lift the multiple energy storage blocks to the high-level energy storage unit. The high-level energy storage unit uses the electricity generated by the photovoltaic power generation system to charge the energy storage block and provide electricity for the operation of the transport device.

[0011] The transport device includes a descending stroke to transport the plurality of energy storage blocks to the low-level energy storage portion; and the transport device is provided with an energy recovery unit for collecting the gravitational potential energy of the plurality of energy storage blocks during the descending stroke and converting the gravitational potential energy into electrical energy to be stored in the energy storage device located in the high-level energy storage portion and / or the low-level energy storage portion;

[0012] Preferably, the high-level energy storage unit includes:

[0013] A plurality of charging docking positions, each of which is used to charge one of the energy storage blocks and to temporarily store a plurality of energy storage blocks during charging;

[0014] A DC / DC converter (50), configured for each charging docking station, for monitoring the charging state of the energy storage block charged at the charging docking station;

[0015] A power conversion module (40) configured to implement power conversion between a plurality of DC / DC converters and a photovoltaic power generation system;

[0016] A power management module (30) configured to determine an operation mode and an output reference power value of the power conversion module (40) and the plurality of DC / DC converters (50) according to a state of the photovoltaic power generation system;

[0017] Preferably, the power management module (30) is configured to set the operating mode of the power conversion module (40) to a maximum power point tracking mode, and set the operating mode of the DC / DC converter (50) to a constant power mode when the photovoltaic power generation system is generating electricity;

[0018] Preferably, the power management module (30) is further configured to set the operating mode of the power conversion module (40) to a constant power mode and the operating mode of the DC / DC converter (50) to a droop mode when the photovoltaic power generation system is not generating power;

[0019] Preferably, the energy storage block comprises a housing, a plurality of energy storage units, an energy storage block management module (10), and a circuit electrically connecting the plurality of energy storage units to the energy storage block management module (10);

[0020] The housing is a structure having an external protection function and is provided with a standardized electrical interface for connecting the DC / DC converter (50);

[0021] The energy storage unit is a battery or a supercapacitor, each of which is independently packaged and electrically connected through a circuit;

[0022] The energy storage block management module (10) is configured to monitor the working status of each energy storage unit and the energy storage block;

[0023] Preferably, the energy storage block management module (10) is further configured to receive information about the operating mode of the DC / DC converter (50) and the output reference power value of the energy storage block in the constant power mode from the power management module (30), and control the output of the DC / DC converter (50);

[0024] Preferably, in the constant power mode, the energy storage block management module (10) is configured to determine the output reference power value of each DC / DC converter (50) according to the real-time state of each energy storage block, and provide the output reference power value of each DC / DC converter (50) to the corresponding DC / DC converter (50);

[0025] Preferably, in the droop mode, the energy storage block management module (10) is further configured to set a droop curve for each DC / DC converter (50) based on the state of each energy storage block, and provide data of the droop curve to the corresponding DC / DC converter (50) before the DC / DC converter (50) starts working.

[0026] The beneficial effects achieved by the present invention are:

[0027] 1. The distribution system of this technical solution installs an energy recovery unit between the high-level energy storage unit and the low-level energy storage unit. It uses the gravitational potential energy of the energy storage block during the descent process to recover energy, converting the gravitational potential energy into electrical energy and storing it. This improves the overall energy utilization efficiency of the system and is conducive to application scenarios with high-low height differences in power generation equipment and charging equipment.

[0028] 2. Compared to transmitting electricity to low-altitude areas via long-distance cables, this technology solution's distribution system achieves power distribution through the physical transportation of energy storage blocks, avoiding the energy loss problem associated with long-distance transmission. This presents a significant advantage, especially in scenarios where high-voltage transmission is unavailable.

[0029] 3. The distribution system of this technical solution can intelligently adjust the charge and discharge status of the energy storage blocks according to the real-time power generation status of the photovoltaic system, and flexibly adjust the energy distribution mode. When photovoltaic power generation is sufficient, the system prioritizes charging and improves energy storage efficiency. When photovoltaic power generation is insufficient, the system automatically switches to discharge mode to ensure power supply. The charging / discharging operating parameters of each energy storage block can be individually adjusted based on the status of each energy storage block to protect the service life of the energy storage block.

[0030] 4. The software and hardware parts of the distribution system of this technical solution adopt a modular design. The various working modules and components of the hardware part of the system, as well as the instructions, parameters, and algorithms of the software part can be easily replaced and / or upgraded at a later stage, thereby reducing the construction cost and maintenance cost of this system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but rather the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0032] Explanation of the accompanying drawings: 100 - energy storage block; 10 - energy storage block management module; 20 - power storage system controller; 30 - power management module; 40 - power conversion module; 50 - DC / DC converter; 52 - additional DC / DC converter; 70 - photovoltaic power generation system; 80 - DC path; 100 - high-level energy storage unit; 300 - low-level energy storage unit; 200 - transport device; 210 - transport assembly; 220 - carrier; 230 - second transport assembly; 400 - energy storage device; 500 - computing architecture; 502 - bus; 504 - processor; 506 - main memory; 508 - read-only memory; 510 - storage device; 512 - display; 514 - input device; 516 - cursor control device; 518 - network device;

[0033] Figure 1 Schematic diagram of the layout of the distribution system according to an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the architecture of the high-level energy storage unit in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the working mode of the power generation state conversion distribution system based on the photovoltaic power generation system in an embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of a sag curve in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of a transport device used in an embodiment of the present invention;

[0038] Figure 6 FIG. 1 is a schematic diagram of the architecture of a computer system used in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with its embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For those skilled in the art, other systems, methods and / or features of the present embodiment will become apparent after reviewing the following detailed description. It is intended that all such additional systems, methods, features and advantages are included in this specification. Included within the scope of the present invention and protected by the appended claims. Additional features of the disclosed embodiments are described in the following detailed description, and these features will be apparent from the following detailed description.

[0040] The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation. The terms used in the drawings to describe the positional relationship are only for illustrative purposes and cannot be understood as limiting this patent. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0041] Example 1: As an example, an energy optimization distribution system for an adaptive photovoltaic power generation system is proposed. The distribution system establishes a circuit connection with an existing photovoltaic power generation system and is capable of distributing the electrical energy generated by the photovoltaic power generation system. The distribution system includes a high-level energy storage unit, a low-level energy storage unit, a transport device disposed between the high-level and low-level energy storage units, and a plurality of energy storage blocks.

[0042] The high-level energy storage unit is deployed at a higher altitude than the low-level energy storage unit and is connected to the existing photovoltaic power generation system circuit to receive the electric energy generated by the photovoltaic power generation system;

[0043] The low-level energy storage unit is deployed as a distribution center for energy storage blocks;

[0044] Each energy storage block is an independent entity and is equipped with a standard electrical interface. After being received by the low-level energy storage unit, the energy storage block enters the transport device according to a control instruction, and the transport device performs an ascending stroke to lift the multiple energy storage blocks to the high-level energy storage unit. The high-level energy storage unit uses the electricity generated by the photovoltaic power generation system to charge the energy storage block and provide electricity for the operation of the transport device.

[0045] The transport device includes a descending stroke to transport the plurality of energy storage blocks to the low-level energy storage portion; and the transport device is provided with an energy recovery unit for collecting the gravitational potential energy of the plurality of energy storage blocks during the descending stroke and converting the gravitational potential energy into electrical energy to be stored in the energy storage device located in the high-level energy storage portion and / or the low-level energy storage portion;

[0046] Preferably, the high-level energy storage unit includes:

[0047] A plurality of charging docking positions, each of which is used to charge one of the energy storage blocks and to temporarily store a plurality of energy storage blocks during charging;

[0048] A DC / DC converter 50 is configured for each charging docking station, and is used to monitor the charging status of the energy storage block charged at the charging docking station;

[0049] The power conversion module 40 is configured to implement power conversion configuration between a plurality of DC / DC converters and a photovoltaic power generation system;

[0050] The power management module 30 is configured to determine the operation mode and output reference power value of the power conversion module 40 and the plurality of DC / DC converters 50 according to the state of the photovoltaic power generation system;

[0051] Preferably, the power management module 30 is configured to set the operating mode of the power conversion module 40 to the maximum power point tracking mode and the operating mode of the DC / DC converter 50 to the constant power mode when the photovoltaic power generation system is generating electricity;

[0052] Preferably, the power management module 30 is further configured to set the operating mode of the power conversion module 40 to a constant power mode and the operating mode of the DC / DC converter 50 to a droop mode when the photovoltaic power generation system is not generating electricity;

[0053] Preferably, the energy storage block includes a housing, a plurality of energy storage units, an energy storage block management module 10, and a circuit electrically connecting the plurality of energy storage units to the energy storage block management module 10;

[0054] The housing is a structure with an external protection function and is equipped with a standardized electrical interface for connecting the DC / DC converter 50;

[0055] The energy storage unit is a battery or a supercapacitor, each of which is independently packaged and electrically connected through a circuit;

[0056] The energy storage block management module 10 is configured to monitor the working status of each energy storage unit and the energy storage block;

[0057] Preferably, the energy storage block management module 10 is further configured to receive information about the operating mode of the DC / DC converter 50 and the output reference power value of the energy storage block in the constant power mode from the power management module 30, and control the output of the DC / DC converter 50;

[0058] Preferably, in the constant power mode, the energy storage block management module 10 is configured to determine the output reference power value of each DC / DC converter 50 according to the real-time status of each energy storage block, and provide the output reference power value of each DC / DC converter 50 to the corresponding DC / DC converter 50;

[0059] Preferably, in the droop mode, the energy storage block management module 10 is further configured to set a droop curve for each DC / DC converter 50 based on the state of each energy storage block, and provide the droop curve data to the corresponding DC / DC converter 50 before the DC / DC converter 50 starts working;

[0060] Before going into details, let's first clarify the basic definitions of several terms mentioned in this article:

[0061] The nominal capacity of an energy storage block refers to the theoretical available electrical energy capacity pre-set by the manufacturer of the energy storage block during the development process. The commonly used unit is Ah.

[0062] State of charge (SOC) refers to the current state of charge of the energy storage block, expressed as a percentage;

[0063] State of Health (SOH) refers to the health of the energy storage block's current state relative to its ideal or initial state, expressed as a percentage;

[0064] The energy storage block can be optimized by the manufacturer and includes a minimum single structural system assembled by connecting two or more energy storage units in series or parallel. The energy storage unit can refer to a single battery or other independent entity with energy storage function, such as a supercapacitor. The energy storage block can be monitored and controlled by the energy storage block management module. Each energy storage block may include multiple energy storage units and corresponding protection units or any other protection devices.

[0065] The power limit of an energy storage block refers to the upper limit of the input and output power of the energy storage block, which is pre-set by the manufacturer based on the electrical design of the energy storage block. The power limit of the energy storage block can be set individually according to the specifications of the energy storage units provided in each energy storage block, and can be set based on the state of charge and temperature of the energy storage block. In addition, the power limit can refer to a charging power limit or a discharging power limit, depending on whether the energy storage block is currently in the charging or discharging state.

[0066] The following describes in more detail the implementation of the dispensing system of the present disclosure.

[0067] In an exemplary embodiment, as shown in the attached Figure 1The figure is a schematic diagram of an application scenario of the distribution system; as shown in the figure, the high-level energy storage unit 100 is set at a relatively high altitude, such as on a mountain or at sea level; and the low-level energy storage unit 300 is set at a lower altitude, such as halfway up a mountain, at the foot of a mountain or on the seabed; electrical appliances used at the low-level energy storage unit, such as unmanned aircraft, unmanned vehicles, and unmanned submarines, can automatically dock with the low-level energy storage unit and remove energy storage blocks from the low-level energy storage unit or unload energy storage blocks to the low-level energy storage unit; electrical appliances can be used for surveys, inspections, monitoring, etc., and the low-level energy storage unit can be used as a distribution point for battery replacement; the above only points out an exemplary application scenario and is not a designated use of the technical solution disclosed in this disclosure;

[0068] Furthermore, in an exemplary embodiment, as shown in the attached Figure 2 FIG2 shows a block diagram of the components of the distribution system deployed in the high-level energy storage unit, abstractly illustrating the main functions of the high-level energy storage unit. An existing photovoltaic power generation system 70 is connected to the high-level energy storage unit. The output of the photovoltaic power generation system 70 is connected to the bidirectional input / output of each DC / DC converter 50 and the input of the power conversion module 40 via a DC path 80.

[0069] Preferably, the distribution system includes a plurality of DC / DC converters 50; the DC / DC converters 50 are used to independently control the input DC voltage / current for each energy storage block; by applying a DC / DC converter 50 to each charging docking station, even if there are differences in the SOC (state of charge), SOH (state of health) or capacity of the energy storage blocks connected to the charging docking station, existing protection control of the energy storage blocks and energy storage block power control based on the characteristics of each energy storage block can be achieved;

[0070] More specifically, the DC / DC converter 50 is used to convert DC voltages, and can convert one DC voltage level to another DC voltage level to meet the needs of different battery systems or loads. At the same time, the DC / DC converter 50 can adjust the charge and discharge power of the energy storage block 100 and independently control each energy storage block 100, including each energy storage unit within each energy storage block 100, according to the real-time needs of the distribution system. Preferably, the DC / DC converter 50 is configured to have a large-capacity bidirectional conversion capability, which can not only store the electrical energy generated by the photovoltaic system in the energy storage block 100, but also output the electrical energy in the energy storage block 100 to the load.

[0071] Preferably, the DC / DC converter 50 can adopt a full-bridge, half-bridge or flyback topology to adapt to different power levels and system requirements, and can be selected according to the specific needs of the distribution system and the energy storage block 100;

[0072] Preferably, the energy storage block 100 is used to store energy or electricity, and each energy storage block 100 is manufactured as an individual that can be transported independently; preferably, the energy storage block 100 includes a shell, multiple energy storage units inside, and a circuit for electrically connecting the energy storage units, and preferably also includes necessary protection circuits and control circuits; each of the energy storage units can be an independent battery or a combination of multiple batteries connected in series or parallel through a circuit; in the attached Figure 1 In the figure, the plurality of energy storage blocks 100 are independently numbered, exemplarily marked as 100 - a , 100 - b , etc., to distinguish each energy storage block;

[0073] Preferably, each energy storage block 100 is equipped with an energy storage block management module (BMS); Figure 2 As shown, each energy storage block 100 is configured with an energy storage block management module 10, and corresponding to the number of the energy storage block, each energy storage block management module 10 is identified by the number 10-a, 10-b to distinguish each other; each energy storage block management module 10 is used to monitor the corresponding energy storage block 100, including monitoring the current and voltage of each energy storage unit in each energy storage block 100, and the surface temperature and / or internal temperature of the energy storage block 100, and preferably calculates the state of charge (SOC) of the energy storage block 100 based on the monitoring results, and controls the charging and / or discharging of the energy storage block 100;

[0074] Exemplarily, the energy storage block 100 - a is connected to the DC / DC converter 50 - a , the energy storage block 100 - b is connected to the DC / DC converter 50 - b , and so on; the power output of the DC / DC converter 50 corresponding to each energy storage block 100 is connected to the power conversion module 40 through the DC path 80 ;

[0075] Preferably, the distribution system is equipped with a power storage system controller 20, which can be deployed as a circuit connected to multiple DC / DC converters 50 and further connected to multiple energy storage blocks 100; the power storage system controller 20 includes relevant peripheral circuits; the power storage system controller 20 can obtain relevant monitoring data of the energy storage blocks, such as voltage, current, temperature, and circuit breakers, from the energy storage block management module 10 of the energy storage block 100; and based on these energy storage block-related monitoring data, further control the operating parameters of the DC / DC converter 50;

[0076] Furthermore, the power conversion module 40 configured on the DC path 80 can be used to convert the DC power generated by the photovoltaic power generation system 70 into AC power, and the AC power is subsequently processed by the downstream power-consuming equipment; in some embodiments, the downstream power-consuming equipment may include the transportation device 60, as well as the components included in the high-level energy storage unit described in the embodiment; exemplarily, the power conversion module 40 may include a DC / AC inverter; exemplarily, the output of the DC / DC converter 50 may be connected to the power conversion module 40, so that the electrical energy of one or more energy storage blocks 100 can be output to the power conversion module 40 for conversion and then transmitted to the downstream power-consuming equipment at the back end; exemplarily, the power conversion module 40 preferably operates in a constant power mode; the power management module 30 connected to the power conversion module 40 can control the output of the power conversion module 40 based on the monitoring and control results of the energy storage block management module 10 and / or the power storage system controller 20;

[0077] It should be noted that, in a preferred exemplary embodiment, the high-level energy storage unit is further configured with an energy storage device 400 that provides a minimum guaranteed electric energy, and in some embodiments, the energy storage device 400 may be the same component as the energy storage block, or may be realized by combining one or more of the energy storage blocks, or may also be a separately designed energy storage device. The difference is that the energy storage device 400 is a fixed device and is fixedly configured in the high-level energy storage unit, thereby distinguishing it from the energy storage block as a conventional movable component. Preferably, the energy storage device 400 may have the same energy storage block management module 10 as the energy storage block and a similar working circuit, and may be configured with a dedicated additional DC / DC converter 52 to achieve the same charge / discharge function as the energy storage block.

[0078] In the following description, unless otherwise specified, the working process of the energy storage device 400 and the functions and principles of each component are the same as those of the energy storage block 100 and are not described separately here;

[0079] Exemplarily, the communication between the energy storage block management module 10, the power storage system controller 20, the power management module 30 and the power conversion module 40 can be achieved through a controller area network (CAN) or Ethernet;

[0080] For example, the power storage system controller 20 configured to manage the overall charging control for multiple energy storage blocks can report the status information of each energy storage block 100 to the power management module 30; the status information of each energy storage block 100 may include information such as the state of charge (SOC), state of health (SOH), voltage, and temperature; the power storage system controller 20 can provide the power management module 30 with information such as the power limit (P_limit) and actual power (P_real) of each energy storage block 100; the power management module 30 responsible for controlling the entire distribution system can issue charging or discharging commands to the power conversion module 40 during system operation;

[0081] Here, the power storage system controller 20 determines the output reference value of each DC / DC converter 50 while taking into account the state of each energy storage block. According to an embodiment of the present invention, the output reference value of a single DC / DC converter 50 can be set in different ways according to the droop mode or the constant power mode.

[0082] When the output mode of the DC / DC converter 50 is the droop mode, the power storage system controller 20 can set a droop curve for each DC / DC converter 50 according to the state of each energy storage block, and provide it to the corresponding DC / DC converter 50 before the system starts operating; at the same time, when the DC / DC converter 50 operates in the constant power mode, the power reference of the DC / DC converter 50 can be determined during the system operation and provided to the corresponding DC / DC converter;

[0083] During the actual operation of the distribution system, the power management module 30 can send charge / discharge commands to the power conversion module 40 and the power storage system controller 20. At this time, the power management module 30 can monitor the status of the photovoltaic power generation system 70, downstream power-consuming equipment, and each energy storage block in real time, and determine the operating mode and output reference value of each component in the distribution system according to the preset operating commands.

[0084] Further, if Figure 3 As shown, when the photovoltaic power generation system 70 is generating electricity, the power management module 30 operates in the maximum power point tracking mode (MPPT) and the DC / DC converter 50 operates in the constant power mode. The output power reference value Pp of the power management module 30 is determined by the MPPT value table of the power conversion module 40. Here, the maximum power point tracking control is a control method that obtains maximum power by appropriately adjusting the load according to external conditions. The point at which maximum power is transmitted is called the maximum power point, which may change depending on external conditions (such as solar radiation and temperature).

[0085] In addition, the output power reference value Pp of the energy storage block can be calculated and determined by the power management controller 30 and can be calculated based on the difference between the power required by the downstream power-consuming equipment and the power generation of the photovoltaic power generation system 60; if Pb is a negative value, the energy storage block can be charged according to the value; if Pb is a positive value, the energy storage block can be discharged according to the value;

[0086] On the other hand, when the photovoltaic system stops generating electricity or its generating capacity is lower than a preset threshold, such as at night or on cloudy days, the power conversion module can operate in constant power mode and the DC / DC converter 50 can operate in droop mode. In this case, the output power reference value Pp of the power conversion module 40 is equal to the target power value Pg required by the downstream power-consuming equipment. In this case, the total output of the multiple DC / DC converters 50 corresponding to the multiple energy storage blocks is controlled to be equal to Pp, but the output of each DC / DC converter can be determined and independently controlled based on the droop curve.

[0087] Preferably, the power storage system controller 20 can receive information about the operation mode and Pb value in the constant power mode from the power management module 30, and can execute the power distribution and energy storage block balanced charge / discharge algorithm proposed in this embodiment; in addition, the power storage system controller 20 can receive information related to multiple energy storage blocks from the multiple energy storage block management modules 10; the information related to these energy storage blocks may include the SOC, SOH, real-time current value, real-time voltage value, and temperature of each energy storage block;

[0088] The power storage system controller 20 can execute different DC / DC converter control strategies according to whether the operating mode received from the power management module 30 is a constant power mode or a droop mode. In the constant power mode, the power storage system controller 20 can determine the output power reference value of the DC / DC converter 50 in real time based on the energy storage block status information received from the multiple energy storage block management modules 10. In this case, each DC / DC converter 50 or its controller can adjust the output power of each energy storage block in real time according to the real-time received output power reference value.

[0089] On the other hand, in the droop mode, the power storage system controller 20 can set a droop curve for the DC / DC converter 50 based on the state of each energy storage block and provide it to each DC / DC converter 50; each DC / DC converter 50 can determine its own output reference value based on the real-time DC link voltage value Vdc; the DC / DC converter 50 can control the output power based on the determined output reference value and adjust and update the reference value in real time;

[0090] Furthermore, when the system operates in droop mode, the voltage Vdc of the DC path between the output of one or more DC / DC converters 50 and the input of the power conversion module 40 may fluctuate due to the power conversion module 40 performing operations according to the received charging or discharging instructions. In this case, each DC / DC converter 50 can sense this fluctuation and calculate an output reference power value of the DC / DC converter 50 by referring to a preset droop curve for the DC / DC converter 50. The DC / DC converter can control the power target based on the calculated output reference power value to track the output reference power value in real time.

[0091] In some embodiments, based on the power generation status of the photovoltaic power generation system 70, the energy charge levels of the multiple energy storage blocks, and the usage requirements of multiple electrical appliances, if the energy storage blocks are not fully charged, the high-level energy storage unit can be withdrawn to initiate a descending journey and transported to the low-level energy storage unit to urgently support the power needs of the electrical appliances.

[0092] Further, as attached Figure 4 , which is a schematic diagram of a droop curve for output control of a DC / DC converter 50 in an exemplary embodiment; as shown in the figure, the horizontal axis represents the voltage Vdc of the DC path, and the vertical axis represents the output power Pout of the DC / DC converter 50 corresponding to one energy storage board;

[0093] The power storage system controller 20 can control the output power of the DC / DC converter 50 according to the state of each energy storage block by controlling the slope of the droop curve; in addition, the power storage system controller 20 can also set the charging and discharging operating range by setting the maximum charging power 306 and the maximum discharging power 301;

[0094] exist Figure 3 In the droop curve shown, the “dead zone” where charging and discharging are not performed can be defined by the dead zone upper limit 304 and the dead zone lower limit 303; Figure 4 In the droop curve, a maximum charging voltage 305 may also be determined, indicating that charging is stopped when the maximum charging voltage 305 is reached; and a minimum discharging voltage 302 may be determined, indicating that discharging is stopped when the minimum discharging voltage 302 is reached.

[0095] As described above, the droop curve control shown is used to maintain the stability of the voltage of the DC link 80, while the dead band is used to prevent frequent charging / discharging operations caused by noise and sensor errors in the distribution system in the standby state. For example, the upper and lower limits of the dead band can be set between 450-550V, which is the voltage range of the DC link in the standby state.

[0096] Through the above exemplary embodiments, the distribution system of the disclosed technical solution has the function of efficiently adjusting power distribution in response to the power generation state of the photovoltaic power generation system being in the start or stop state;

[0097] That is, when the photovoltaic power generation system is in a qualified power generation state, it can balance charge the multiple energy storage blocks in the high-level energy storage unit, and provide the maximum operating power of the transport device based on the MPPT strategy to transport the charged energy storage blocks to the low-level energy storage unit, and continue to transport the energy storage blocks to be charged from the low-level energy storage unit;

[0098] At the same time, the energy storage device 400, which can serve as a power guarantee, is also charged in a timely manner to at least ensure the operation of the distribution system, for example, to at least transport all the energy storage blocks on the transport path of the moving device to the target energy storage unit, or to serve as a power supplement for the instantaneous high power demand when the transport device is initially started;

[0099] On the other hand, when the photovoltaic power generation system fails to reach a qualified power generation state or even stops generating power, a constant power mode can be set for downstream power-consuming equipment, and based on a droop curve strategy, multiple energy storage blocks that are still in the high-level energy storage part can be used for power output as a second power guarantee in addition to the energy storage device 400.

[0100] Embodiment 2: This embodiment should be understood to include at least all the features of any of the above embodiments and further improve upon them;

[0101] As attached Figure 5 As shown, and combined with the attached Figure 1 , exemplarily showing an embodiment of the transport device;

[0102] The transport device 200 is a transport component structure; Figure 5 Only a portion of the transport device is shown during the ascending stroke or the descending stroke;

[0103] The transport device 200 is composed of one or more cyclically operated conveying assemblies 210. The conveying assemblies 210 are arranged along a suitable path between the high-level energy storage section 100 and the low-level energy storage section 300. The conveying assemblies are supported and driven by drive wheels and guide wheels to ensure smooth operation of the conveying assemblies during the up and down strokes. The drive wheels are connected to an electric motor, which is powered by a photovoltaic power generation system to support the continuous operation of the conveying assemblies.

[0104] For example, during the ascending stroke, the conveying assembly 210 starts from the exit position of the low-level energy storage unit and drives the carrier 220 therein to sequentially receive energy storage blocks from the low-level energy storage unit through an automatic mechanical device; the conveying assembly 210 stably places the energy storage blocks on the charging docking position of the high-level energy storage unit through a guide rail or other positioning device provided at the entrance of the high-level energy storage unit;

[0105] Exemplarily, another part of the second conveying assembly 230 can be provided to implement the descending stroke; the second conveying assembly 230 used in the descending stroke can be similar to the conveying assembly 210 used in the ascending stroke; or a conveying assembly independently designed based on the energy recovery unit can be used to perform the descending stroke; Exemplarily, when the energy storage block is fully charged, the charged energy storage block is placed on the second conveying assembly 230 of the descending stroke by an automated device; The second conveying assembly 230 of the descending stroke can be configured with a power recovery device, which uses the gravitational potential energy of the energy storage block to drive the power recovery device during the descent process to realize the conversion of gravitational potential energy into electrical energy; Thereafter, the electrical energy generated by the power recovery device is recovered and stored in the energy storage device 400 for subsequent use;

[0106] Preferably, a plurality of carriers 220 are provided in the conveying assembly 210 and / or the second conveying assembly 230; preferably, the carrier 220 is a sturdy frame that can stably accommodate an energy storage block; the inner wall and the bottom of the carrier 220 are made of impact-resistant materials to prevent the energy storage block from shaking or being damaged during transportation; preferably, the carrier 220 is designed with a standardized docking device that can achieve precise docking with the outlet of the low-level energy storage part and the charging docking position of the high-level energy storage part; the energy storage block can be automatically loaded or unloaded by driving the docking device, thereby improving the degree of automation of the system; preferably, the carrier 220 is equipped with an electric locking and releasing mechanism to ensure that the energy storage block is stable and does not shift during transportation; when arriving at the high-level energy storage part or the low-level energy storage part, the energy storage block is automatically loaded or unloaded. When the load is complete, the locking device is automatically released, allowing the energy storage block to be safely unloaded; preferably, the conveying assembly 210 and the conveying assembly 220 are provided with a plurality of sensors along the way to monitor the status of the energy storage block in the carrier 220 in real time, including its position, weight, stability, moving speed, etc.; the sensors can also detect the operating status of the conveying assembly to ensure that when an abnormality is detected (such as a stuck belt or weight imbalance), the system automatically stops running and issues an alarm; preferably, the transport device 200 is configured with a control system; the control system can intelligently schedule the operation of the conveying assembly according to the charging status and transportation demand of the energy storage block; the system can give priority to transporting the energy storage block to be charged to the high-level energy storage part, or give priority to transporting the fully charged energy storage block to the low-level energy storage part for energy recovery;

[0107] Exemplarily, the low-level energy storage unit 300 is configured with a low-level energy storage device 420 that is the same as or similar to the energy storage device 400, and a docking station similar to the charging docking station configured for the high-level energy storage unit 100; the energy storage block after charging is used to replenish electric energy for the low-level energy storage device 420 to support the continuous operation of the low-level energy storage unit 300.

[0108] Embodiment 3: This embodiment should be understood to include at least all the features of any of the above embodiments and further improve upon them;

[0109] For example, as shown in the attached Figure 6 FIG. 5 illustrates an embodiment of a computer system 500 used by the power management module 30 or other working modules in the distribution system; the computer system 500 can be used to identify and determine the data storage, calculation, and result output processes of each working module in the system;

[0110] Illustratively, computer system 500 includes a bus 502 or other communication mechanism for communicating information, and one or more processors 504 coupled with bus 502 for processing information; processor 504 may be, for example, one or more general-purpose microprocessors;

[0111] The computer system 500 also includes a main memory 506, such as a random access memory (RAM), a cache, and / or other dynamic storage device, coupled to the bus 502 for storing information and instructions to be executed by the processor 504; the main memory 506 may also be used to store temporary variables or other intermediate information during execution of instructions to be executed by the processor 504; these instructions, when stored in a storage medium accessible to the processor 504, present the computer system 500 as a special-purpose machine customized to perform the operations specified in the instructions;

[0112] The computer system 500 may also include a read-only memory (ROM) 508 or other static storage device coupled to the bus 502 for storing static information and instructions for the processor 504; a storage device 510 such as a magnetic disk, an optical disk, or a USB drive (flash drive) is coupled to the bus 502 for storing information and instructions;

[0113] And further, coupled to the bus 502 may also include a display 122 for displaying various information, data, media, etc., an input device 514 for allowing a user of the computer system 500 to control, manipulate, and / or interact with the computer system 500;

[0114] A preferred way of interacting with the management system may be through a cursor control device 516, such as a computer mouse or similar control / navigation mechanism;

[0115] Furthermore, the computer system 500 may further include a network device 518 coupled to the bus 502; wherein the network device 518 may include, for example, a wired network card, a wireless network card, a switching chip, a router, a switch, and other components;

[0116] In general, the terms "engine," "component," "system," "database," and the like as used herein may refer to logic embodied in hardware or firmware, or to a collection of software instructions, possibly with entry and exit points, written in a programming language such as Java, C, or C++; software components may be compiled and linked into executable programs, installed in a dynamic link library, or may be written in an interpreted programming language (e.g., BASIC, Perl, or Python); it will be understood that software components may be callable from other components or from themselves, and / or may be called in response to detected events or interrupts;

[0117] Software components configured to execute on a computing device may be provided on a computer-readable medium, such as a compact disc, digital video disc, flash drive, magnetic disk, or any other tangible medium, or as a digital download (and may be initially stored in a compressed or installable format that requires installation, decompression, or decryption prior to execution); such software code may be stored in part or in whole on a memory device of the executing computing device for execution by the computing device; software instructions may be embedded in firmware, such as an EPROM; it will also be understood that hardware components may be composed of connected logic units (such as gates and flip-flops), and / or may be composed of programmable units (such as a programmable gate array or processor);

[0118] Computer system 500 includes a processor that can implement the techniques described herein using custom hard-wired logic, one or more ASICs or FPGAs, firmware, and / or program logic that, in combination with the computer system, renders computer system 500 a special-purpose computing device;

[0119] According to one or more embodiments, the techniques herein are performed by computer system 500 in response to processor 504 executing one or more sequences of one or more instructions contained in main memory 506; such instructions may be read into main memory 506 from another storage medium, such as storage device 510; execution of the sequences of instructions contained in main memory 506 causes processor 504 to perform the process steps described herein; in alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions;

[0120] As used herein, the term "non-transitory media" and similar terms refer to any media that store data and / or instructions that cause a machine to operate in a specific fashion; such non-transitory media may include non-volatile media and / or volatile media; non-volatile media include, for example, optical or magnetic disks, such as storage device 510; volatile media include dynamic memory, such as main memory 506;

[0121] Among these, common forms of non-transitory media include, for example, floppy disks, diskettes, hard disks, solid-state drives, magnetic tape or any other magnetic data storage medium, CD-ROMs, any other optical data storage medium, any physical medium having a pattern of holes, RAM, PROM and EPROM, FLASH-EPROM, NVRAM, any other memory chip or cartridge, and networked versions thereof;

[0122] Non-transient media are distinct from, but may be used in conjunction with, transmission media; transmission media participate in the transmission of information between non-transient media; for example, transmission media include coaxial cables, copper wires, and optical fibers, including the wires that comprise bus 502; transmission media may also take the form of sound or light waves, such as radio waves and infrared data communications.

[0123] Although the present invention has been described above with reference to various embodiments, it will be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, replace, or add various processes or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different from that described, and / or various components may be added, omitted, and / or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, such as different aspects and elements of the configurations may be combined in a similar manner. Furthermore, as technology develops, the elements therein may be updated, i.e., many of the elements are examples and do not limit the scope of the present disclosure or the claims.

[0124] Specific details are given in the description to provide a thorough understanding of the exemplary configurations, including implementations. However, the configurations can be practiced without these specific details. For example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail to avoid obscuring the configurations. This description provides only example configurations and does not limit the scope, applicability, or configurations of the claims. Instead, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made to the function and arrangement of the elements without departing from the spirit or scope of the present disclosure.

[0125] In summary, it is intended that the above detailed description be considered illustrative rather than restrictive, and it should be understood that the above embodiments are intended to be merely illustrative of the present invention and not to limit the scope of protection of the present invention. After reading the contents of the present invention, a skilled person may make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. An energy optimization distribution system for an adaptive photovoltaic power generation system, characterized in that: The distribution system establishes a circuit connection with the existing photovoltaic power generation system and is capable of distributing the electric energy generated by the photovoltaic power generation system; the distribution system includes a high-level energy storage unit, a low-level energy storage unit, a transportation device arranged between the high-level and low-level energy storage units, and multiple energy storage blocks; the high-level energy storage unit receives the electric energy generated by the photovoltaic power generation system; the low-level energy storage unit is deployed as a distribution center for the energy storage blocks; each energy storage block is an independent individual; after being received by the low-level energy storage unit, the energy storage block enters the transportation device according to the control instruction, and the transportation device performs an ascending stroke to lift multiple energy storage blocks to the high-level energy storage unit; the high-level energy storage unit uses the electric energy generated by the photovoltaic power generation system to charge the energy storage block and provide electric energy for the operation of the transportation device; the transportation device includes an execution The transport device is equipped with an energy recovery unit for collecting the gravitational potential energy of the multiple energy storage blocks during the descent and converting the gravitational potential energy into electrical energy for storage in the energy storage device located in the high-level energy storage unit and / or the low-level energy storage unit; the photovoltaic power generation system is connected to the high-level energy storage unit; the high-level energy storage unit is also equipped with an energy storage device for providing a minimum guaranteed electrical energy; the output power reference value of a single DC / DC converter is set in different ways according to the droop mode or the constant power mode; when in the droop mode, the power storage system controller sets a droop curve for each DC / DC converter according to the state of each energy storage block, and provides it to the corresponding DC / DC converter before the system starts operating; When operating in constant power mode, the power reference of the DC / DC converter is determined during system operation and provided to the corresponding DC / DC converter; The output power reference value of the power management module is determined by the MPPT value table of the power conversion module; the output power reference value of the energy storage block is calculated by the power management controller based on the difference between the power required by the downstream power-consuming equipment and the power generation of the photovoltaic power generation system; if the output power reference value is a negative value, the energy storage block is charged according to this value; if the output power reference value is a positive value, the energy storage block is discharged according to this value; when the photovoltaic system stops generating electricity or its power generation capacity is lower than a preset threshold, the power conversion module operates in constant power mode and the DC / DC converter operates in droop mode; otherwise, the power management module operates in maximum power point tracking mode and the DC / DC converter operates in constant power mode; At this time, the output power reference value of the power conversion module is equal to the required power target value Pg of the downstream power-consuming equipment; At this time, the total output of the multiple DC / DC converters corresponding to the multiple energy storage blocks is controlled to be equal to the output power reference value, but the output of each DC / DC converter is determined and independently controlled based on the droop curve. The power storage system controller receives information about the operating mode and output power reference value in the constant power mode from the power management module and executes the power distribution and energy storage block balanced charging / discharging algorithm. In the constant power mode, the power storage system controller determines the output power reference value of the DC / DC converter in real time based on the energy storage block status information received from the multiple energy storage block management modules. Each DC / DC converter or its controller adjusts the output power of each energy storage block in real time based on the received real-time output power reference value. Each DC / DC converter determines its own output power reference value based on the real-time DC link voltage value Vdc. The DC / DC converter controls the output power based on the determined output power reference value and adjusts and updates the output power reference value in real time. Based on the power generation status of the photovoltaic power generation system, the energy charge level of the multiple energy storage blocks, and the usage requirements of multiple electrical appliances, if the energy storage block is not fully charged, the high-level energy storage unit is withdrawn to initiate the descent journey to the low-level energy storage unit. The power storage system controller controls the output power of the DC / DC converter according to the status of each energy storage block by controlling the slope of the droop curve. In addition, the power storage system controller also sets the charging and discharging operating range by setting the maximum charging power and the maximum discharging power. In the droop curve, the area where charging and discharging are not performed is defined by the upper and lower limits of the dead zone, and the upper and lower limits of the dead zone are set between 450-550V. Charging stops when the maximum charging voltage is reached; discharging stops when the minimum discharge voltage is reached. When the photovoltaic power generation system fails to reach a qualified power generation state or even stops generating power, the lower limit is set. The mobile electrical equipment implements a constant power mode, and based on the droop curve strategy, uses multiple energy storage blocks that are still in the high-level energy storage part to output electricity; the transportation device is a conveying component structure, and multiple carriers are arranged in the conveying component; the carrier is a sturdy frame; the inner wall and bottom of the carrier are made of impact-resistant materials; the carrier is designed with a standardized docking device, which can be docked with the outlet of the low-level energy storage part and the charging docking position of the high-level energy storage part; the carrier is equipped with an electric locking and release mechanism; when reaching the high-level energy storage part or the low-level energy storage part, the locking device is automatically released; the energy storage blocks can be automatically loaded or unloaded by the drive of the docking device.

2. The dispensing system according to claim 1, wherein: The high-level energy storage unit includes: A plurality of charging docking positions, each of which is used to charge one of the energy storage blocks and to temporarily store a plurality of energy storage blocks during charging; A DC / DC converter (50), one DC / DC converter configured for each charging docking station, for monitoring the charging state of the energy storage block charged at the charging docking station; A power conversion module (40) configured to implement power conversion configuration between a plurality of DC / DC converters and a photovoltaic power generation system; The power management module (30) is configured to determine the operation mode and output reference of the power conversion module (40) and the plurality of DC / DC converters (50) according to the state of the photovoltaic power generation system.

3. The dispensing system according to claim 2, wherein: The power management module (30) is configured to set the working mode of the power conversion module (40) to the maximum power point tracking mode and the working mode of the DC / DC converter (50) to the constant power mode when the photovoltaic power generation system generates power.

4. The dispensing system according to claim 3, wherein: The power management module (30) is further configured to set the operating mode of the power conversion module (40) to a constant power mode and the operating mode of the DC / DC converter (50) to a droop mode when the photovoltaic power generation system is not generating power.

5. The dispensing system according to claim 4, wherein: The energy storage block comprises a housing, a plurality of energy storage units, an energy storage block management module (10), and a circuit electrically connecting the plurality of energy storage units to the energy storage block management module (10); The housing is a structure having an external protection function and is provided with a standardized electrical interface for connecting the DC / DC converter (50); The energy storage unit is a battery or a supercapacitor, each of which is independently packaged and electrically connected through a circuit; The energy storage block management module (10) is configured to monitor the working status of each energy storage unit and the energy storage block.

6. The dispensing system according to claim 5, wherein: The energy storage block management module (10) is further configured to receive information about the working mode of the DC / DC converter (50) and the output reference power value of the energy storage block in the constant power mode from the power management module (30), and to control the output of the DC / DC converter (50).

7. The dispensing system according to claim 6, wherein: In the constant power mode, the energy storage block management module (10) is configured to determine the output reference power value of each DC / DC converter (50) according to the real-time status of each energy storage block, and provide the output reference power value of each DC / DC converter (50) to the corresponding DC / DC converter (50).

8. The dispensing system according to claim 7, wherein: In the droop mode, the energy storage block management module (10) is further configured to set a droop curve for each DC / DC converter (50) based on the state of each energy storage block, and provide data of the droop curve to the corresponding DC / DC converter (50) before the DC / DC converter (50) starts working.

9. An electronic device comprising a processor and a memory, characterized in that: The memory stores computer instructions, and the processor is configured to execute the computer instructions stored in the memory. When the computer instructions are executed by the processor, the system implements the functions of the distribution system according to any one of claims 1 to 8.

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