Distributed optical storage and charging integrated system

Abstract

The invention provides a distributed light storage and charging integrated system. The system comprises a power supply cabinet, and a photovoltaic power generation unit, a commercial power supply grid, an energy storage unit and a charging unit which are electrically connected with the power supply cabinet. The power supply cabinet is used for controlling electric energy output objects and output states of the photovoltaic power generation unit, the commercial power supply grid and the energy storage unit, outputting residual electric energy of the photovoltaic power generation unit and the commercial power supply grid to the energy storage unit, and outputting electric energy of the energy storage unit to the charging unit. The photovoltaic storage and charging integrated power station can solve the problem that the power distribution capacity of a new energy automobile charging station is insufficient, energy storage is carried out through the night off-peak electricity price, power is supplied to the charging station through the stored energy and the mains supply in the charging peak period, the power utilization requirement in the peak period is met, peak load shifting is achieved, the power distribution capacity increase fee is saved, and the energy consumption is reduced. And the consumption of new energy is increased, the defect of discontinuity of solar power generation is overcome, the energy conversion efficiency is improved, and the method is a sustainable energy utilization mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage and charging, and in particular relates to a distributed photovoltaic storage and charging integrated system. Background Art

[0002] Photovoltaic and electric vehicle industries are currently popular industries, and electric vehicle charging has also become a key industry combining photovoltaics and electric vehicles. It is conducive to optimizing the energy consumption structure, reducing the contradiction between energy supply and demand, and promoting energy conservation and emission reduction.

[0003] Currently, electric vehicle charging mostly relies on direct power supply from the mains, or combined with photovoltaic power supply. Photovoltaic power generation is obviously limited by lighting conditions, while direct power supply from the mains will increase the burden on the power grid during peak hours of electricity consumption. At the same time, the economic benefits will be lower, which is not conducive to improving energy conversion efficiency. Summary of the invention

[0004] In response to the above technical problems, this application proposes a distributed photovoltaic storage and charging integrated system. The specific technical solutions are as follows:

[0005] A distributed photovoltaic storage and charging integrated system, including a power cabinet and a photovoltaic power generation unit electrically connected to the power cabinet, a city power supply grid, an energy storage unit and a charging unit;

[0006] The power supply cabinet is used to control the power output object and output status of the photovoltaic power generation unit, the mains power supply grid and the energy storage unit, output the surplus power of the photovoltaic power generation unit and the mains power supply grid to the energy storage unit, and output the power of the energy storage unit to the charging unit.

[0007] Furthermore, it also includes a microgrid energy management unit, which includes a battery management module, an energy management module and an energy storage inverter. The battery management module is used for monitoring, evaluating and protecting the battery, the energy management module is used for collecting data and energy scheduling, and the energy storage inverter is used to control the conversion of AC and DC during the charging and discharging process of the energy storage unit.

[0008] Furthermore, the energy management module includes: a city electricity price acquisition submodule, a photovoltaic power generation power monitoring submodule, a battery energy monitoring submodule, a charging status monitoring submodule, a calculation submodule and an adjustment execution submodule;

[0009] The mains price acquisition submodule is used to acquire real-time mains power supply price information;

[0010] The photovoltaic power generation monitoring submodule is used to monitor and provide photovoltaic power generation implementation power information;

[0011] The battery energy monitoring submodule is used to monitor the real-time energy information of the battery in the current state;

[0012] The charging status monitoring submodule is used to monitor and obtain the real-time usage status of the charging unit;

[0013] The calculation submodule is used to obtain the above information and perform relevant calculations to obtain intermediate values;

[0014] The adjustment execution submodule is used to execute relevant energy adjustment measures according to the result of the intermediate value.

[0015] Furthermore, the calculation submodule obtains the working power of the photovoltaic power generation unit, the mains power supply grid, the energy storage unit and the charging unit, and then calculates the current potential working gain of the system. The calculation method of the potential working gain is the working power of the photovoltaic power generation unit, the mains power supply grid, the energy storage unit and the working power of the charging unit minus the working power of the charging unit.

[0016] Furthermore, when the potential working gain is a positive gain, different energy adjustment measures are performed according to the change of the charging state of the charging unit.

[0017] Furthermore, the energy adjustment factor is calculated by the following formula:

[0018] U = a1b1c1 + a2b2c2 + a3b4c5;

[0019] In the above formula, b is the working state, which takes the value of 1 or 0, where 1 means working and 0 means not working; c is the output state, which takes the value of 1 or -1, where 1 means output to the charging unit and -1 means output to the energy storage unit; a is the energy mark, where a1 takes the value of 1, indicating photovoltaic power generation, a2 takes the value of 2, indicating mains power supply, and a3 takes the value of 3, indicating an energy storage unit;

[0020] Energy regulation and management are performed based on the calculated different U values ​​and the status changes of the charging unit.

[0021] Furthermore, when the charging power increases, the energy regulation and management methods include:

[0022] Reduce the charging power of the charging unit;

[0023] and / or temporarily close the interfaces of some charging units;

[0024] and / or increase the discharge power of photovoltaic power generation units, mains power supply, and energy storage units;

[0025] Access to energy storage unit and mains power supply grid for charging.

[0026] Furthermore, when the charging power is reduced, the energy regulation and management methods include:

[0027] Reduce or remove the energy supply from photovoltaic power generation units, energy storage units, and the mains power supply grid;

[0028] and / or maintain current job status.

[0029] Furthermore, when the charging power decreases, part of the idle energy is stored in the energy storage unit.

[0030] The beneficial effects of the present invention are as follows: the integrated photovoltaic storage and charging power station of the present application can solve the problem of insufficient power distribution capacity of new energy vehicle charging stations. It utilizes the low-peak electricity prices at night to store energy, and supplies power to the charging station together with the city electricity during the charging peak period to meet the peak electricity demand. It not only realizes peak shaving and valley filling, but also saves the cost of power distribution and capacity expansion, increases the consumption of new energy, makes up for the lack of discontinuity of solar power generation, and improves energy conversion efficiency. It is a sustainable energy utilization method. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure shows the topology of the distributed photovoltaic storage and charging integrated system. DETAILED DESCRIPTION

[0032] In the following description, certain specific details are set forth in order to provide a thorough understanding of various embodiments. However, it will be appreciated by those skilled in the art that the present invention may be practiced without these details. In other cases, well-known structures are not shown or described in detail to avoid unnecessarily obscuring the description of the embodiments. Unless the context otherwise requires, throughout the specification and the appended claims, the word "comprising" shall be interpreted in an open, inclusive sense, i.e., as "including but not limited to".

[0033] "One embodiment" or "embodiment" mentioned throughout this specification means that in at least one embodiment, specific features, structures or characteristics related to the embodiment are included. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout this specification do not necessarily all refer to the same embodiment. In addition, specific features, structures or characteristics can be combined in any suitable manner in one or more embodiments. In addition, as used in this specification and the appended claims, the singular forms "one / kind" and "the" include plural indicators unless the context clearly dictates otherwise. It should also be noted that the term "or" is generally used in its meaning that includes "and / or" unless the context clearly dictates otherwise.

[0034] The distributed integrated photovoltaic storage and charging system described in this application is an integrated comprehensive system including a photovoltaic power generation unit, an energy storage unit, a charging unit and a microgrid energy management unit. It aims to fully utilize energy conversion efficiency from the perspective of energy utilization efficiency and realize rational utilization and optimal allocation of energy.

[0035] Figure 1The figure shows the topology of a distributed photovoltaic storage and charging integrated system. In this system, photovoltaic power generation units are arranged in a distributed manner as the main power supply unit of the photovoltaic storage and charging integrated system. The power generated by the photovoltaic power generation unit is converted into AC power through a current converter and inverter, and then charged to electric vehicles or loads through charging piles.

[0036] As the main component of the charging unit, the charging pile is an energy supply facility to maintain the operation of electric vehicles. According to different charging technology classifications, the current common charging piles are divided into DC charging piles and AC charging piles. The DC charging pile first converts AC power into DC power, and then directly charges the battery through the charging socket, with an input voltage of 380V. The DC charging pile has a large output power, and the general specifications are 30, 60, 80, 120, 150, 180kW, etc. The AC charging pile charges the electric vehicle battery through the on-board motor. The AC charging pile only provides power output, has no charging function, and the input voltage is 220V. The output power of the AC charging pile will not be very large, generally 3.5, 7.0, 14.0kW, etc.

[0037] The energy storage unit consists of a storage battery and a bidirectional inverter, and has the characteristics of bidirectional variable power power transmission. The energy storage battery is installed and protected by a battery cabinet, and is the most flexible energy control unit in the integrated photovoltaic storage and charging system.

[0038] The installation of energy storage units reduces the system's dependence on the power grid, which can not only ensure the further consumption of renewable energy power generation, but also take advantage of the fluctuation of energy utilization status to smooth out the peak and fill the valley. Energy storage units usually use lithium iron phosphate batteries, which have the characteristics of long cycle life, low cost, high cost performance, large current charging and discharging, high temperature resistance, high energy density, no memory effect, safety and no pollution.

[0039] The energy sources of the energy storage unit include photovoltaic power generation of the photovoltaic power generation unit and power generation from the power grid. The power management is achieved by setting up a power cabinet. Photovoltaic power generation can charge the energy storage unit through the power cabinet, or directly power the charging unit through the power cabinet. The power generated by the power grid can be reduced to 380V AC through a transformer, which can then be used to charge the energy storage unit through the power cabinet, or directly power the charging unit through the power cabinet.

[0040] The microgrid energy management unit includes three major modules: battery management module, energy management module and energy storage inverter. The battery management module plays a sensing role and is mainly responsible for battery monitoring, evaluation, protection and balancing. The energy management module plays a decision-making role and is mainly responsible for data collection, network monitoring and energy scheduling. The energy storage inverter plays an executive role and its main function is to control the charging and discharging process of the energy storage battery group and perform AC / DC conversion.

[0041] In the implementation scheme, the energy management module can determine its functional design features based on the design requirements of the actual functions, especially the system power supply based on AC power supply, photovoltaic power generation and energy storage power supply in this application. More scientific management and control are required in the process of energy management to improve energy utilization efficiency and charging efficiency.

[0042] More specifically, the energy management module includes: a city electricity price acquisition submodule, a photovoltaic power generation power monitoring submodule, a battery energy monitoring submodule, a charging status monitoring submodule, a calculation submodule and an adjustment execution submodule.

[0043] The function of the energy management module is to regulate and manage the energy management when the state of the charging unit changes under the currently determined system state to achieve optimal energy utilization. The currently determined system state means that the working states of the photovoltaic power generation unit, the energy storage unit, the AC power supply and the charging unit are all determined. For example, the photovoltaic power generation unit and the energy storage unit are directly used to charge the charging unit. The AC power supply is not connected, and the working state of the charging unit is also determined.

[0044] Among them, the mains price acquisition submodule is used to obtain real-time mains power supply price information;

[0045] The photovoltaic power generation monitoring submodule is used to monitor and provide photovoltaic power generation implementation power information;

[0046] The battery energy monitoring submodule is used to monitor the real-time energy information of the battery in its current state;

[0047] The charging status monitoring submodule is used to monitor and obtain the real-time usage status of the charging unit;

[0048] The calculation submodule is used to obtain the above information and perform relevant calculations to obtain intermediate values;

[0049] The adjustment execution submodule is used to execute relevant energy adjustment measures according to the results of the intermediate values.

[0050] When the charging state of the charging unit changes, generally the change in charging state means an increase or decrease in charging power. Usually, when a new charging vehicle is added, the charging power increases, and when the vehicle is fully charged, the charging power decreases. The following state information needs to be determined:

[0051] The charging state change value of the charging unit, including the increase of charging power and the decrease of charging power;

[0052] The working state of the energy storage unit, including charging state, discharging state and non-working state;

[0053] The working status of the photovoltaic power generation unit, including power generation and charging status, power generation and energy storage status, and non-working status;

[0054] The working status of the mains power supply, including power supply charging status, power supply energy storage status, and non-working status;

[0055] At the same time, the current potential working gain of the entire system is judged, and P1+P2+P3-P4 is used to calculate the current potential working gain, where P1 refers to the power of power generation, P2 refers to the power of AC power supply, P3 refers to the energy storage working power, and P4 refers to the working power of the charging unit. The value of the potential working gain generally includes positive, 0 and negative values, where a positive value indicates a positive gain, 0 indicates no gain, and a negative value indicates a negative gain. More specifically, a positive gain indicates that the charging of the entire system is not saturated, 0 indicates that the charging of the entire system is in a saturated state, and a negative value indicates that the charging of the entire system is oversaturated. Since negative values ​​have an adverse effect on the operation of the entire system, timely processing should be made when negative gains occur, such as deactivating some charging piles or reducing the charging power of the entire charging unit to avoid charging overload.

[0056] When the current potential working gain is no gain, timely processing should also be made. The preferred method in this state is to lock the remaining non-working charging piles.

[0057] When the current potential working gain is positive, the working status of the photovoltaic power generation unit, energy storage unit, and mains power supply is unknown. Therefore, when the state of the charging unit changes, it is not conducive to energy regulation and management. It is necessary to further process the data and calculate the management reference factor through the following formula:

[0058] U = a1b1c1 + a2b2c2 + a3b4c5;

[0059] In the above formula, b is the working state, which takes the value of 1 or 0, where 1 means working and 0 means not working. c is the output state, which takes the value of 1 or -1, where 1 means output to the charging unit and -1 means output to the energy storage unit. These data can be directly collected and obtained through the power cabinet. a is the energy tag, and different energy tags have different values. a1 can take the value of 1, indicating photovoltaic power generation, a2 can take the value of 2, indicating AC power supply, and a3 can take the value of 3, indicating an energy storage unit.

[0060] Since the current potential working gain is a positive gain, it means that at least one energy source is supplying energy to the charging unit. Therefore, the working status of the photovoltaic power generation unit, energy storage unit, and mains power supply can be obtained based on the calculated U value:

[0061] When U is 6, it means that the photovoltaic power generation unit, energy storage unit, and mains power supply are all powered by the charging unit;

[0062] When U is 5, it means that the energy storage unit and the mains supply power to the charging unit, while the photovoltaic power generation unit is not working;

[0063] When U is 4, it means that the photovoltaic power generation unit and the energy storage unit supply energy to the charging unit, while the mains power supply unit is not working;

[0064] When U is 3, it means that the photovoltaic power generation unit and the mains power supply are supplying energy to the charging unit, while the energy storage unit is not working;

[0065] When U is 1, it means that the photovoltaic power generation unit supplies energy to the charging unit, and the energy storage unit and the mains power supply are not working;

[0066] When U is -4, it means that the photovoltaic power generation unit supplies energy to the charging unit, and the mains power supply supplies energy to the energy storage unit;

[0067] When U is 2, it means that the mains power supply is used to supply energy to the charging unit, and the energy storage unit and photovoltaic power generation unit are not working;

[0068] When U is -2, it means that the mains power supply is used to supply energy to the charging unit, and the photovoltaic power generation unit is used to supply energy to the energy storage unit. Generally, this situation can be ignored. In order to consider economic benefits, when the photovoltaic power generation unit can work normally, the photovoltaic power generation unit function will be selected first;

[0069] When U is 3, it means that the energy storage unit supplies energy to the charging unit, and the mains power supply and photovoltaic power generation unit are not working;

[0070] When U is 0, it means that the energy storage unit supplies energy to the charging unit, and the AC power supply and photovoltaic power generation unit supply energy to the energy storage unit. Generally, this situation can be ignored. The AC power supply and photovoltaic power generation unit supply energy to the energy storage unit, which itself has the problem of energy conversion rate. Then, the energy storage unit supplies energy to the charging unit, which is not conducive to maximizing the energy utilization efficiency.

[0071] It can be seen that after the U value is output, the working status of each energy can be directly judged, and then the energy can be regulated and managed according to the state change of the charging unit.

[0072] When the charging power increases, different energy regulation and management are performed according to different output U values:

[0073] When U is 6, the photovoltaic power generation unit, energy storage unit, and mains power supply are all powered by the charging unit. To avoid overload operation of the entire system, it is necessary to appropriately reduce the charging power of the charging unit or temporarily close some charging piles;

[0074] When U is 5, the energy storage unit and the mains supply power to the charging unit, while the photovoltaic power generation unit is not working. At this time, it should be considered that the photovoltaic power generation unit is working abnormally or there is no light condition or night condition, and the photovoltaic power generation unit cannot generate electricity or the power generation is small. Therefore, the charging power of the charging unit should be appropriately reduced or some charging piles should be temporarily closed;

[0075] When U is 4, the photovoltaic power generation unit and the energy storage unit supply energy to the charging unit, while the AC power supply unit is not working. This is a common working state. If the photovoltaic power generation unit and the energy storage unit have not reached their load limit, you can consider increasing the discharge power of the photovoltaic power generation unit and the energy storage unit. If the photovoltaic power generation unit and the energy storage unit have reached their load limit, you should consider connecting to the AC power supply to meet the power demand of the charging unit.

[0076] When U is 3, the photovoltaic power generation unit and the mains power supply provide energy for the charging unit, while the energy storage unit does not work. In this state, since the photovoltaic power generation unit can work normally, the night condition is excluded, and the condition that the mains power supply is in a low price state should also be excluded. At this time, the remaining energy of the energy storage unit itself is insufficient. If the photovoltaic power generation unit and the mains power supply have not reached the load limit, the discharge power of the photovoltaic power generation unit and the mains power supply can be increased. If the photovoltaic power generation unit and the energy storage unit have reached the load limit, the charging power of the charging unit should be reduced, or some charging piles should be temporarily closed;

[0077] When U is 1, the photovoltaic power generation unit supplies energy to the charging unit, and the energy storage unit and the mains power supply are not working. In this state, since the photovoltaic power generation unit can work normally, the night condition is excluded, and thus the condition that the mains power supply is in a low price state should also be excluded. At this time, the two situations of sufficient or insufficient remaining energy in the energy storage unit should be considered. When the remaining energy in the energy storage unit is sufficient, the energy storage unit is turned on to meet the power demand of the charging unit. When the remaining energy is insufficient, the mains power supply is connected to meet the power demand of the charging unit.

[0078] When U is -4, the photovoltaic power generation unit supplies energy to the charging unit, and the mains power supply supplies energy to the energy storage unit, indicating that the energy storage unit itself has insufficient remaining energy, and the mains power supply is connected to meet the power demand of the charging unit;

[0079] When U is 2, the mains power supply is used to supply energy to the charging unit, and the energy storage unit and photovoltaic power generation unit are not working. At this time, it should be considered that the photovoltaic power generation unit is working abnormally or there is no light condition or night condition, and the photovoltaic power generation unit cannot generate electricity or the power generation power is small. In addition, the mains power supply is used to supply energy to the charging unit first, and the energy storage unit is not enabled to supply energy to the charging unit. This indicates that the energy storage unit itself has insufficient remaining energy. Consider reducing the charging power of the charging unit, or temporarily closing some charging piles;

[0080] When U is 3, the energy storage unit supplies energy to the charging unit, and the AC power supply and photovoltaic power generation unit are not working. Since photovoltaic power generation is a direct energy source, when the energy storage unit is used to supply energy to the charging unit but photovoltaic power generation is not used, it should be considered that the photovoltaic power generation unit is working abnormally or there is no light condition or night condition. The photovoltaic power generation unit cannot generate electricity or the power generation capacity is small, then the AC power supply or photovoltaic power generation unit should be connected to supply energy to the charging unit.

[0081] When the charging power is reduced, different energy regulation and management are performed according to different output U values:

[0082] When U is 6, the photovoltaic power generation unit, energy storage unit, and mains power supply are all used to supply energy to the charging unit. In this case, the photovoltaic power generation unit, energy storage unit, and mains power supply should be reduced or removed to supply energy to the charging unit, and the priority of the photovoltaic power generation unit, energy storage unit, and mains power supply increases in turn;

[0083] When U is 5, the energy storage unit and the mains supply power to the charging unit, and the photovoltaic power generation unit is not working, then the energy storage unit and the mains supply power to the charging unit should be reduced or removed, and the priority of the mains supply power is lower than that of the energy storage unit;

[0084] When U is 4, the photovoltaic power generation unit and the energy storage unit supply energy to the charging unit, and the mains power supply unit is not working, then the photovoltaic power generation unit and the energy storage unit should be reduced or removed to supply energy to the charging unit, and the priority of the energy storage unit is higher than that of the photovoltaic power generation unit;

[0085] When U is 3, the photovoltaic power generation unit and the mains power supply provide energy for the charging unit, while the energy storage unit does not work. In this state, since the photovoltaic power generation unit can work normally, the night condition is excluded, and thus the condition that the mains power supply is in a low-price state should also be excluded. At this time, it should be considered that the energy storage unit itself has insufficient remaining energy, and the photovoltaic power generation unit and the mains power supply should be reduced or removed to provide energy for the charging unit, and the mains power supply has a higher priority than the photovoltaic power generation unit.

[0086] When U is 1, the photovoltaic power generation unit supplies energy to the charging unit, and the energy storage unit and the mains power supply are not working. In this state, the photovoltaic power generation unit can work normally, so the night condition is excluded, and the condition that the mains power supply is at a low price should also be excluded. At this time, the existing working state should be maintained;

[0087] When U is -4, the photovoltaic power generation unit supplies energy to the charging unit, and the mains power supply supplies energy to the energy storage unit, indicating that the energy storage unit itself has insufficient remaining energy, and the current working state should be maintained at this time;

[0088] When U is 2, the mains power supply is used to supply energy to the charging unit, and the energy storage unit and the photovoltaic power generation unit are not working. At this time, it should be considered that the photovoltaic power generation unit is working abnormally or there is no light condition or night condition, and the photovoltaic power generation unit cannot generate electricity or the power generation power is small. In addition, the mains power supply is used to supply energy to the charging unit first, and the energy storage unit is not enabled to supply energy to the charging unit, indicating that the energy storage unit itself has insufficient remaining energy, and the existing working state should be maintained at this time;

[0089] When U is 3, the energy storage unit supplies energy to the charging unit, and the AC power supply and photovoltaic power generation unit are not working. Since photovoltaic power generation is a direct energy source, when the energy storage unit is used to supply energy to the charging unit but photovoltaic power generation is not used, it should be considered that the photovoltaic power generation unit is working abnormally or there is no light condition or night condition. The photovoltaic power generation unit cannot generate electricity or the power generation capacity is small, and the current working state should be maintained.

[0090] In addition, when the charging power decreases, some idle energy can be stored in the energy storage unit according to the actual situation. The idle energy includes the surplus energy of photovoltaic power generation and the mains power supply energy at low prices at night.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Distributed photovoltaic storage and charging integrated system, characterized by: It includes a power cabinet and a photovoltaic power generation unit, a city power supply grid, an energy storage unit and a charging unit electrically connected to the power cabinet; The power supply cabinet is used to control the power output object and output status of the photovoltaic power generation unit, the mains power supply grid and the energy storage unit, output the surplus power of the photovoltaic power generation unit and the mains power supply grid to the energy storage unit, and output the power of the energy storage unit to the charging unit.

2. The distributed photovoltaic storage and charging integrated system according to claim 1 is characterized in that: It also includes a microgrid energy management unit, which includes a battery management module, an energy management module and an energy storage inverter. The battery management module is used for monitoring, evaluating and protecting the battery, the energy management module is used for collecting data and energy scheduling, and the energy storage inverter is used to control the conversion of AC and DC during the charging and discharging process of the energy storage unit.

3. The distributed photovoltaic storage and charging integrated system according to claim 2 is characterized in that: The energy management module includes: a city electricity price acquisition submodule, a photovoltaic power generation power monitoring submodule, a battery energy monitoring submodule, a charging status monitoring submodule, a calculation submodule and an adjustment execution submodule; The mains price acquisition submodule is used to acquire real-time mains power supply price information; The photovoltaic power generation monitoring submodule is used to monitor and provide photovoltaic power generation implementation power information; The battery energy monitoring submodule is used to monitor the real-time energy information of the battery in the current state; The charging status monitoring submodule is used to monitor and obtain the real-time usage status of the charging unit; The calculation submodule is used to obtain the above information and perform relevant calculations to obtain intermediate values; The adjustment execution submodule is used to execute relevant energy adjustment measures according to the result of the intermediate value.

4. The distributed photovoltaic storage and charging integrated system according to claim 3 is characterized in that: The calculation submodule obtains the working power of the photovoltaic power generation unit, the mains power supply grid, the energy storage unit and the charging unit, and then calculates the current potential working gain of the system. The calculation method of the potential working gain is the working power of the photovoltaic power generation unit, the mains power supply grid, the energy storage unit minus the working power of the charging unit.

5. The distributed photovoltaic storage and charging integrated system according to claim 4 is characterized in that: When the potential working gain is a positive gain, different energy adjustment measures are performed according to the change of the charging state of the charging unit.

6. The distributed photovoltaic storage and charging integrated system according to claim 5 is characterized in that: The energy adjustment factor is calculated by the following formula: U = a1b1c1 + a2b2c2 + a3b4c5; In the above formula, b is the working state, which takes the value of 1 or 0, where 1 means working and 0 means not working; c is the output state, which takes the value of 1 or -1, where 1 means output to the charging unit and -1 means output to the energy storage unit; a is the energy mark, where a1 takes the value of 1, indicating photovoltaic power generation, a2 takes the value of 2, indicating mains power supply, and a3 takes the value of 3, indicating an energy storage unit; Energy regulation and management are performed based on the calculated different U values ​​and the status changes of the charging unit.

7. The distributed photovoltaic storage and charging integrated system according to claim 6, characterized in that: When the charging power increases, the energy regulation and management methods include: Reduce the charging power of the charging unit; and / or temporarily close the interfaces of some charging units; and / or increase the discharge power of photovoltaic power generation units, mains power supply, and energy storage units; Access to energy storage unit and mains power supply grid for charging.

8. The distributed photovoltaic storage and charging integrated system according to claim 6, characterized in that: When the charging power is reduced, the energy regulation and management methods include: Reduce or remove the energy supply from photovoltaic power generation units, energy storage units, and the mains power supply grid; and / or maintain current job status.

9. The distributed photovoltaic storage and charging integrated system according to claim 8, characterized in that: When the charging power decreases, some of the idle energy is stored in the energy storage unit.

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