Low-carbon building energy distribution system

Abstract

A low-carbon building energy distribution system provided by the present invention comprises an external power grid, a photovoltaic module, a charging pile, an electric energy distribution module and an electricity load, the external power grid, the photovoltaic module and the electricity load are connected with the electric energy distribution module, one end of the charging pile is connected with the electric energy distribution module, and the other end of the charging pile is connected with the electricity load. And the other end of the charging pile is selectively and electrically connected with the mobile energy storage equipment, and the charging pile can perform bidirectional power transmission between the electric energy distribution module and the mobile energy storage equipment. Electric energy of photovoltaic or mobile energy storage equipment does not need to be fed back to a power grid, the equipment cost is low, electric energy loss is reduced, complex cost calculation corollary equipment is not needed, and line transformation of an existing building is facilitated; compared with a large-capacity fixed battery, the mobile energy storage equipment is low in cost, more flexible and safer, and is particularly suitable for low-carbon emission reduction of family residential buildings.

Description

Technical Field

[0001] The invention relates to a low-carbon building, in particular to a low-carbon building energy distribution system. Background Art

[0002] Providing electricity to buildings through photovoltaic power generation, thereby reducing building electricity consumption and achieving low-carbon and environmental protection goals is the main technical path for low-carbon buildings. In order to maximize the use of photovoltaic energy, it is usually necessary to increase electricity or energy storage equipment. Prior art CN115173466A discloses a power grid system used in buildings, in which photovoltaic power generation facilities are connected to a DC bus, which is converted by DC / DC to power charging piles, and at the same time, AC / DC modules are used to power electrical loads such as lighting in the building. There are four working modes: photovoltaic power supply to the vehicle (equivalent to energy storage equipment); buildings and photovoltaic power supply to the vehicle together; photovoltaic power supply to the vehicle and the building; photovoltaic power supply to the vehicle and the building, and photovoltaic power supply to part of the light.

[0003] However, the above technology has the following problems: (1) When the photovoltaic modules are not working (for example, at night), the power loads in the building still need to be powered by the external power grid; (2) It is suitable for buildings with distributed photovoltaics and electric new energy vehicle charging piles. In other words, only when a large number of charging piles are used can a large amount of electricity generated by photovoltaics be consumed. If the charging piles are used for home use and new energy vehicles are used during the day, the photovoltaic modules can only be abandoned, wasting energy. Although the excess electricity generated by photovoltaics can be fed back to the power grid, the cost of the solution is relatively high due to the instability of photovoltaic power generation.

[0004] At present, the reverse charging technology of using new energy vehicles as a storage device to feed electric energy back to the grid has been studied and piloted. It mainly provides emergency backup power for the grid when the grid demand is peak. However, this reverse charging technology also needs to solve the problem of grid connection, and in order to make users accept it, a series of policies need to be formulated, and the market prospects are limited. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a low-carbon building energy distribution system, including an external power grid, a photovoltaic component, a charging pile, an electric energy distribution module, and an electric load, wherein the external power grid, the photovoltaic component, and the electric load are respectively connected to the electric energy distribution module, one end of the charging pile is connected to the electric energy distribution module, and the other end of the charging pile is selectively electrically connected to a mobile energy storage device, and the charging pile can perform bidirectional power transmission between the electric energy distribution module and the mobile energy storage device.

[0006] Further, the power distribution module includes a load power comparison module. The charging pile has three working states: drawing power from the mobile energy storage device, supplying power to the mobile energy storage device, and stopping power supply and power drawing. The load power comparison module is used to calculate and compare the total power supply Qs and the total load consumption power Qe, and determine the working mode of the system according to the comparison result. Among them, the total power supply Qs is determined by the power generation power of the photovoltaic module and the working state of the charging pile, and the total load consumption power Qe is determined by the electrical load and the working state of the charging pile.

[0007] Further, the working modes of the system include: external power grid power supply, photovoltaic module power supply, charging pile power supply, external power grid and photovoltaic module power supply, photovoltaic module and charging pile power supply, external power grid and charging pile power supply, external power grid, photovoltaic module and charging pile power supply.

[0008] Further, the method for selecting the working mode of the system is as follows:

[0009] Obtain the power generation power Q1 of the photovoltaic module and the total power Q2 of the electrical load.

[0010] Obtain the working state of the charging pile. When the working state of the charging pile is drawing power from the mobile energy storage device, obtain the discharge power Q3 of the mobile energy storage device. The total power supply Qs = Q1 + Q3, and the total load consumption power Qe = Q2. If 0 < Q1 < Qe ≤ Qs, the working mode is photovoltaic module and charging pile power supply; if Q1 > 0 and Qs < Qe, the working mode is external power grid, photovoltaic module and charging pile power supply; if Q1 = 0 and Qs ≥ Qe, the working mode is charging pile power supply; if Q1 = 0 and Qs < Qe, the working mode is external power grid and charging pile power supply.

[0011] When the working state of the charging pile is supplying power to the mobile energy storage device, obtain the power consumption power Q4 of the mobile energy storage device. The total power supply is Qs = Q1, and the total load consumption power Qe = Q2 + Q4. If Q1 > 0 and Qs ≥ Qe, the working mode is photovoltaic module power supply; if Q1 > 0 and Qs < Qe, the working mode is external power grid and photovoltaic module power supply; if Q1 = 0, the working mode is external power grid power supply.

[0012] When the working state of the charging pile is stopping power supply and power drawing, the total power supply is Qs = Q1, and the total load consumption power Qe = Q2. If Qs ≥ Qe, the working mode is photovoltaic module power supply; if 0 < Qs < Qe, the working mode is external power grid and photovoltaic module power supply; if 0 = Qs < Qe, the working mode is external power grid power supply.

[0013] In the above method, Qe is greater than 0.

[0014] Furthermore, the charging pile includes a charging pile mode setting module, and the charging pile mode setting module includes three working modes: drawing power from a mobile energy storage device, supplying power to a mobile energy storage device, and automatic. In the working mode of drawing power from a mobile energy storage device, the working state of the charging pile is drawing power from the mobile energy storage device; in the working mode of supplying power to a mobile energy storage device, the working state of the charging pile is supplying power to the mobile energy storage device; in the automatic working mode, according to the set parameters, the working state of the charging pile is one of the three working states of drawing power from the mobile energy storage device, supplying power to the mobile energy storage device, and stopping supplying power.

[0015] Furthermore, the charging pile working mode and setting parameters are set through the charging pile operation interface and / or remotely set through a mobile phone APP.

[0016] Furthermore, the mobile energy storage device is a new energy vehicle.

[0017] According to the low-carbon building energy distribution system of the present invention, there is no need to feed back the electric energy of photovoltaic or mobile energy storage equipment to the power grid, the equipment cost is low, the power loss is reduced, and complicated cost calculation supporting equipment is not required, which is conducive to the line transformation of existing buildings; the use of mobile energy storage equipment is low in cost and more flexible and safe than large-capacity fixed batteries; the number of charging piles and photovoltaic components in the building does not need to be too large, and the charging piles do not need to have a certain degree of concentration, so as to realize true distributed energy utilization, which is particularly suitable for low-carbon emission reduction in residential buildings; the charging pile has three working modes and three working states, and users can choose different working modes, so that the charging pile is in different working states, thereby achieving the purpose of saving electricity bills. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an electrical connection structure diagram of the low-carbon building energy distribution system of the present invention;

[0019] Figure 2 It is a schematic diagram of the control structure of the low-carbon building energy distribution system of the present invention;

[0020] Figure 3 This is a flow chart of working mode 1 of the charging pile of the present invention in automatic mode;

[0021] Figure 4 This is a flow chart of the second working mode of the charging pile of the present invention in the automatic mode;

[0022] Figure 5 This is a flow chart of working mode 3 of the charging pile of the present invention in automatic mode.

[0023] Description of reference numerals:

[0024] 1-External power grid; 2-PV panels; 3-Charging piles; 4-Power distribution module; 5-Power load. DETAILED DESCRIPTION

[0025] See also Figure 1 The low-carbon building energy distribution system includes an external power grid 1, a photovoltaic module 2, a charging pile 3, an electric energy distribution module 4, and an electric load 5, wherein the external power grid 1, the photovoltaic module 2, and the electric load 5 are respectively connected to the electric energy distribution module 4, one end of the charging pile 3 is connected to the electric energy distribution module 4, and the other end is selectively electrically connected to the mobile energy storage device, and the charging pile 3 can perform bidirectional power transmission between the electric energy distribution module 4 and the mobile energy storage device. The direction of the arrow in the figure is the direction of power transmission. Among them, common electric loads are household appliances, such as lighting equipment, air conditioners, refrigerators, televisions, computers, etc. The most typical mobile energy storage device is a new energy vehicle, and "new energy vehicle" is also used for description below.

[0026] According to the source of electricity, the working modes of the above system include:

[0027] (1) Power supply from external grid. When the photovoltaic module 2 is not working (for example, on a cloudy day or at night), the external grid supplies power to the power load and / or the charging pile 3 to meet the power demand; (2) Power supply from photovoltaic modules. When the photovoltaic modules are working and can meet the load demand (including the charging pile and the power load), the photovoltaic modules provide power; (3) Power supply from the charging pile. When the charging pile is connected to a new energy vehicle and the user requires the new energy vehicle to supply power to the power load, the charging pile supplies the power in the new energy vehicle battery to the power load; (4) Power supply from external grid and photovoltaic modules. The external grid and photovoltaic modules jointly supply power to the power load and / or the charging pile; (5) Power supply from photovoltaic modules and charging pile. The photovoltaic modules and charging pile jointly supply power to the power load; (6) Power supply from external grid and charging pile. The external grid and charging pile jointly supply power to the power load; (7) Power supply from external grid, photovoltaic modules and charging pile. The external grid, photovoltaic modules and charging pile jointly supply power to the power load.

[0028] To implement the above working mode, see Figure 2 , the electric energy distribution module includes a load power comparison module and multiple AC / DC, DC / AC conversion modules (used for conversion of AC and DC currents, belonging to the prior art, not shown), and the charging pile includes a charging pile mode setting module, which has three working states: supplying power to the mobile energy storage device, drawing power from the mobile energy storage device, and stopping supplying and drawing power. The load power comparison module is used to calculate and compare the total power supply Qs and the total load consumption Qe, and determine the working mode of the system according to the comparison result; wherein the total power supply Qs is determined by the power generation power of the photovoltaic module and the working state of the charging pile, and the total load consumption Qe is determined by the power load and the working state of the charging pile. In the present invention, the total power supply Qs does not include the actual power supply of the external power grid.

[0029] The method for selecting the working mode of the system is as follows:

[0030] Obtain the power generation power Q1 of the photovoltaic module and the total power Q2 of the electrical load.

[0031] Obtain the working state of the charging pile. When the working state of the charging pile is to draw power from the mobile energy storage device, obtain the discharge power Q3 of the mobile energy storage device. The total power supply Qs = Q1 + Q3, and the total power consumption of the load Qe = Q2. If 0 < Q1 < Qe ≤ Qs, the working mode is power supply by the photovoltaic module and the charging pile; if Q1 > 0 and Qs < Qe, the working mode is power supply by the external power grid, the photovoltaic module and the charging pile; if Q1 = 0 and Qs ≥ Qe, the working mode is power supply by the charging pile; if Q1 = 0 and Qs < Qe, the working mode is power supply by the external power grid and the charging pile.

[0032] When the working state of the charging pile is to supply power to the mobile energy storage device, obtain the power consumption power Q4 of the mobile energy storage device. The total power supply Qs = Q1, and the total power consumption of the load Qe = Q2 + Q4. If Q1 > 0 and Qs ≥ Qe, the working mode is power supply by the photovoltaic module; if Q1 > 0 and Qs < Qe, the working mode is power supply by the external power grid and the photovoltaic module; if Q1 = 0, the working mode is power supply by the external power grid.

[0033] When the working state of the charging pile is to stop power supply and power taking, the total power supply Qs = Q1, and the total power consumption of the load Qe = Q2. If Qs ≥ Qe, the working mode is power supply by the photovoltaic module; if 0 < Qs < Qe, the working mode is power supply by the external power grid and the photovoltaic module; if 0 = Qs < Qe, the working mode is power supply by the external power grid.

[0034] In the above method, Qe is greater than 0.

[0035] The charging pile includes a charging pile mode setting module. The charging pile mode setting module includes three working modes: drawing power from the mobile energy storage device, supplying power to the mobile energy storage device, and automatic. In the working mode of drawing power from the mobile energy storage device, the working state of the charging pile is to draw power from the mobile energy storage device; in the working mode of supplying power to the mobile energy storage device, the working state of the charging pile is to supply power to the mobile energy storage device; in the automatic working mode, according to the set parameters, the working state of the charging pile is one of the three working states: drawing power from the mobile energy storage device, supplying power to the mobile energy storage device, and stopping power supply and power taking. The working mode and set parameters of the charging pile are set through the charging pile operation interface and / or remotely set through the mobile phone APP.

[0036] The following is a detailed description of the switching of the working state of the charging pile in the automatic mode:

[0037] Method 1: The set parameter is the power supply threshold T.

[0038] See Figure 3 , the method for determining the working state of the charging pile includes the following steps:

[0039] S1: Determine whether the charging pile is connected to a mobile energy storage device. If so, go to S2; if not, switch to the stop power supply and power take - up working state;

[0040] S2: Obtain the power generation power Q1 of the photovoltaic module and the total power Q2 of the electrical load;

[0041] S3: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to the state of supplying power to the mobile energy storage device; otherwise, enter S4;

[0042] S4: Obtain the battery percentage C of the mobile energy storage device and the power supply threshold T;

[0043] S5: Determine the relationship between the battery percentage C of the mobile energy storage device and the power supply threshold T. If C = T, switch to the stop power supply and power take - up working state; if C>T, switch to the state of taking power from the mobile device; if C<T, switch to the state of supplying power to the mobile energy storage device.

[0044] In Method 1, the system mainly determines the working state of the charging pile through the battery power and power supply threshold of the mobile energy storage device. For example, the power supply threshold of a new - energy vehicle is set to 80%. If the current battery power is greater than 80%, the new - energy vehicle provides additional electrical energy until the battery power drops to 80%. If the current battery power is less than 80%, the new - energy battery needs to be charged. Specifically, the user can flexibly set the power supply threshold according to the distance from home to work and whether there is a charging pile at the unit, etc.

[0045] Method 2: Set the parameter as the charging and power - taking time period.

[0046] In some areas, time - of - use electricity prices with fluctuations are adopted. For example, from 6:00 to 22:00 is the peak electricity consumption period with a higher electricity price; from 22:00 to 6:00 the next day is the low - electricity - consumption period with a lower electricity price. The charging pile can be set to adopt different working states at different times of the day. For example, during the peak electricity consumption period, take power from the new - energy vehicle, and during the low - electricity - consumption period, supply power to the new - energy vehicle.

[0047] See Figure 4 , the method for determining the working state of the charging pile includes the following steps:

[0048] S11: Determine whether the charging pile is connected to a mobile energy storage device. If so, go to S12; if not, switch to the stop power supply and power take - up working state;

[0049] S12: Obtain the power generation power Q1 of the photovoltaic module and the total power Q2 of the electrical load;

[0050] S13: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to a state of supplying power to the mobile energy storage device. Otherwise, enter S14.

[0051] S14: Determine whether the current time is in the power supply time period. If yes, switch to the power supply state from the mobile device. If no, proceed to step S15.

[0052] S15: Determine whether the current time period is a charging time period. If so, switch to a state of supplying power to the mobile energy storage device; otherwise, switch to a state of stopping power supply and extraction.

[0053] Method 3: Set the parameters as power supply threshold T and charging power time period

[0054] See also Figure 5 , the method for determining the working state of the charging pile includes the following steps:

[0055] S31: Determine whether the charging pile is connected to the mobile energy storage device, if so, enter S32, if not, switch to the power supply and withdrawal working state;

[0056] S32: Obtain the power generation power Q1 of the photovoltaic module and the total power Q2 of the power load;

[0057] S33: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to a state of supplying power to the mobile energy storage device. Otherwise, enter S34.

[0058] S34: Determine whether the current time is in the power supply time period, if yes, proceed to step S35, if no, proceed to step S38;

[0059] S35: Obtaining the power percentage C and power supply threshold T of the mobile energy storage device;

[0060] S36: Determine the relationship between the power percentage C of the mobile energy storage device and the power supply threshold T. If C≥T, switch to the state of drawing power from the mobile device and enter step S37, otherwise switch to the state of stopping power supply and drawing;

[0061] S37: Determine whether C is equal to T. If so, switch to the power supply and draw work state, otherwise return to step S36;

[0062] S38: Determine whether the current time is in the charging time period. If so, switch to the state of supplying power to the mobile energy storage device; otherwise, switch to the state of stopping power supply and extraction.

[0063] In the present invention, the charging pile has three working modes: taking power from a mobile energy storage device, supplying power to a mobile energy storage device, and automatic, which can adapt to the different needs of users. For example, if you plan to go on a long journey the next day, the charging pile will be switched to the mode of supplying power to the mobile energy storage device, and there is no need to obtain electricity from new energy vehicles to ensure the power demand. For example, when there are charging piles with cheap electricity prices at work, or when there is a power outage at home and electricity is urgently needed, the mode of taking power from a mobile energy storage device can be adopted. In areas with time-sharing power supply, or when it is expected that the car will not be used the next day, the automatic mode can be adopted and corresponding settings can be made, so as to achieve the purpose of both ensuring travel and saving household electricity bills. The working mode of the charging pile can be remotely controlled through the APP, which is convenient for switching at any time.

[0064] In addition to the above advantages, the present invention has the following advantages over the prior art:

[0065] (1) In the prior art, when the power of the photovoltaic module exceeds the load, in order to avoid wasting energy, the power of the photovoltaic module is fed back to the power grid. This is usually used in large photovoltaic power plants with large power generation, and requires a special inverter module and complex cost calculation, which is not suitable for home users. The present invention does not need to feed back power to the power grid, greatly saving costs and facilitating the line transformation of existing buildings.

[0066] (2) Some current projects that use new energy vehicles as energy storage carriers and reverse charge to supply electricity to the power grid are suitable for areas with a large number of charging piles. They are not cost-effective for home users, especially private charging piles. Moreover, even if certain subsidies can be obtained for reverse power supply in parking lots, it will occupy limited charging pile resources and will also reduce the mileage of new energy vehicles. This is not ideal in terms of technical complexity and commercial prospects. In the present invention, the power supply of new energy vehicles does not need to be fed back to the power grid, but is directly fed back to the household power load, so the equipment cost is low and users are more likely to accept it.

[0067] (3) Using new energy vehicles as energy storage carriers is more flexible and safer. In the prior art, when the electric energy generated by photovoltaic modules is greater than the load demand, in addition to feeding back to the power grid, some also use batteries as energy storage carriers. However, such batteries are fixed facilities, large in size, and have high maintenance costs. In addition, large-capacity fixed batteries themselves have certain dangers. Once thermal runaway of the battery occurs, it will cause huge losses. The charging pile in the present invention does not need to occupy too much area, and does not have an energy storage function. The energy storage battery is in a mobile new energy vehicle, which is not only low in cost but also more flexible and safe.

[0068] (4) The present invention realizes the real distributed energy utilization. The "distributed" in the prior art, whether it is distributed photovoltaic or distributed charging piles, is essentially to feed back the electricity of photovoltaic power generation or new energy vehicles to the power grid, and then the power grid distributes the electricity, which requires the central node of "power grid" as a transit, which is a pseudo-distributed architecture. For example, a new energy vehicle performs reverse power supply on a charging pile and outputs electricity to the power grid. The user gets the fee (equivalent to selling electricity). When the user needs to charge, he still draws electricity from the power grid (equivalent to buying electricity). The cost of buying electricity must be greater than the cost of selling electricity. This involves the cost of power grid operation. Because of the existence of the central node of the power grid, the pseudo-distributed architecture must have power loss.

[0069] In the present invention, there is no need to feed back any electric energy to the power grid, thus achieving true distributed energy utilization. For example, when a new energy vehicle is charged in an energy distribution system A with photovoltaic modules, when the power of the photovoltaic modules not only meets the normal load demand, but also has surplus electric energy to charge the new energy vehicle, at this time, the new energy vehicle is equivalent to obtaining photovoltaic electric energy from the power supply system A. Subsequently, when the new energy vehicle is powered on the energy distribution system B, it is equivalent to "moving" the photovoltaic electric energy obtained from the power supply system A to the load of the system B, reducing the burden of the photovoltaic modules on the load B. In general, the photovoltaic modules on the systems A and B basically meet the power supply demand. If there are tens of thousands of such energy distribution systems, tens of millions of new energy vehicles become the "path" connecting these systems, so that all energy distribution systems are distributed "nodes", thus achieving true distributed energy utilization.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-carbon building energy distribution system, comprising an external power grid (1), a photovoltaic module (2), a charging pile (3), an electric energy distribution module (4), and an electric load (5), wherein the external power grid (1), the photovoltaic module (2), and the electric load (5) are respectively connected to the electric energy distribution module (4), characterized in that: One end of the charging pile (3) is connected to the power distribution module (4), and the other end of the charging pile (3) is selectively electrically connected to the mobile energy storage device. The charging pile (3) can perform bidirectional power transmission between the power distribution module (4) and the mobile energy storage device.

2. The system according to claim 1, characterized in that The power distribution module (4) includes a load power comparison module. The charging pile (3) has three working states: taking power from the mobile energy storage device, supplying power to the mobile energy storage device, and stopping power supply and taking. The load power comparison module is used to calculate and compare the total power Qs of power supply and the total power Qe of load consumption, and determine the working mode of the system according to the comparison result. Among them, the total power Qs of power supply is determined by the power generation power of the photovoltaic module (2) and the working state of the charging pile (3), and the total power Qe of load consumption is determined by the electrical load (5) and the working state of the charging pile (3).

3. The system according to claim 2, characterized in that The working modes of the system include: power supply from the external power grid (1), power supply from the photovoltaic module (2), power supply from the charging pile (3), power supply from the external power grid (1) and the photovoltaic module (2), power supply from the photovoltaic module (2) and the charging pile (3), power supply from the external power grid (1) and the charging pile (3), power supply from the external power grid (1), the photovoltaic module (2) and the charging pile (3).

4. The system according to claim 3, characterized in that The selection method of the working mode of the system is as follows: Obtain the power generation power Q1 of the photovoltaic module (2) and the total power Q2 of the electrical load (5). Obtain the working state of the charging pile (3). When the working state of the charging pile (3) is taking power from the mobile energy storage device, obtain the discharge power Q3 of the mobile energy storage device. The total power Qs of power supply = Q1 + Q3, and the total power Qe of load consumption = Q2. If 0 < Q1 < Qe ≤ Qs, the working mode is power supply from the photovoltaic module (2) and the charging pile (3); if Q1 > 0 and Qs < Qe, the working mode is power supply from the external power grid (1), the photovoltaic module (2) and the charging pile (3); if Q1 = 0 and Qs ≥ Qe, the working mode is power supply from the charging pile (3); if Q1 = 0 and Qs < Qe, the working mode is power supply from the external power grid (1) and the charging pile (3). When the working state of the charging pile (3) is supplying power to the mobile energy storage device, obtain the power consumption power Q4 of the mobile energy storage device. The total power of power supply is Qs = Q1, and the total power Qe of load consumption = Q2 + Q4. If Q1 > 0 and Qs ≥ Qe, the working mode is power supply from the photovoltaic module (2); if Q1 > 0 and Qs < Qe, the working mode is power supply from the external power grid (1) and the photovoltaic module (2); if Q1 = 0, the working mode is power supply from the external power grid (1). When the working state of the charging pile (3) is stopping power supply and taking, the total power of power supply is Qs = Q1, and the total power Qe of load consumption = Q2. If Qs ≥ Qe, the working mode is power supply from the photovoltaic module (2); if 0 < Qs < Qe, the working mode is power supply from the external power grid (1) and the photovoltaic module (2); if 0 = Qs < Qe, the working mode is power supply from the external power grid (1). In the above method, Qe is greater than 0.

5. The system according to any one of claims 2 to 4, characterized in that: The charging pile (3) includes a charging pile mode setting module. The charging pile mode setting module includes three working modes: taking power from the mobile energy storage device, supplying power to the mobile energy storage device, and automatic. In the working mode of taking power from the mobile energy storage device, the working state of the charging pile (3) is to take power from the mobile energy storage device; in the working mode of supplying power to the mobile energy storage device, the working state of the charging pile (3) is to supply power to the mobile energy storage device; in the automatic working mode, according to the set parameters, the working state of the charging pile (3) is one of the three working states: taking power from the mobile energy storage device, supplying power to the mobile energy storage device, and stopping power supply and taking.

6. The system according to claim 5, characterized in that The set parameter is the power supply threshold T. In the automatic working mode, the method for determining the working state of the charging pile (3) includes the following steps: S1: Determine whether the charging pile (3) is connected to the mobile energy storage device. If so, enter S2; if not, switch to the working state of stopping power supply and taking. S2: Obtain the power generation power Q1 of the photovoltaic module (2) and the total power Q2 of the electrical load (5). S3: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to the state of supplying power to the mobile energy storage device; otherwise, enter S4. S4: Obtain the battery percentage C of the mobile energy storage device and the power supply threshold T. S5: Determine the relationship between the battery percentage C of the mobile energy storage device and the power supply threshold T. If C = T, switch to the working state of stopping power supply and taking; if C>T, switch to the state of taking power from the mobile device; if C<T, switch to the state of supplying power to the mobile energy storage device.

7. The system according to claim 5, characterized in that The set parameter is the charging and taking power time period. In the automatic working mode, the method for determining the working state of the charging pile (3) includes the following steps: S11: Determine whether the charging pile (3) is connected to the mobile energy storage device. If so, enter S12; if not, switch to the working state of stopping power supply and taking. S12: Obtain the power generation power Q1 of the photovoltaic module (2) and the total power Q2 of the electrical load (5). S13: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to the state of supplying power to the mobile energy storage device; otherwise, enter S14. S14: Determine whether the current time is within the power taking time period. If so, switch to the state of taking power from the mobile device; if not, enter step S15. S15: Determine whether the current time is within the charging time period. If so, switch to the state of supplying power to the mobile energy storage device; otherwise, switch to the state of stopping power supply and taking.

8. The system according to claim 5, characterized in that The set parameter is the power supply threshold T and the charging and taking power time period. In the automatic working mode, the method for determining the working state of the charging pile (3) includes the following steps: S31: Determine whether the charging pile (3) is connected to the mobile energy storage device. If so, enter S32; if not, switch to the working state of stopping power supply and taking. S32: Obtain the power generation power Q1 of the photovoltaic module (2) and the total power Q2 of the electrical load (5). S33: Determine the relationship between Q1 and Q2. If Q1≥Q2, switch to the state of supplying power to the mobile energy storage device; otherwise, enter S34. S34: Determine whether the current time is within the power taking time period. If so, execute step S35; if not, enter step S38. S35: Obtain the battery percentage C of the mobile energy storage device and the power supply threshold T. S36: Determine the relationship between the power percentage C of the mobile energy storage device and the power supply threshold T. If C≥T, switch to the state of drawing power from the mobile device and enter step S37, otherwise switch to the state of stopping power supply and drawing; S37: Determine whether C is equal to T. If so, switch to the power supply and draw work state, otherwise return to step S36; S38: Determine whether the current time is in the charging time period. If so, switch to the state of supplying power to the mobile energy storage device; otherwise, switch to the state of stopping power supply and extraction.

9. The system according to claim 5, characterized in that: The working mode and setting parameters of the charging pile (3) are set via the charging pile (3) operation interface and / or remotely set via a mobile phone APP.

10. The system according to claim 1, characterized in that The mobile energy storage device is a new energy vehicle.

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