A new energy store V2G system

Abstract

The present invention discloses a new energy store V2G system, which includes a regional main transformer, a charging stack power distribution cabinet, an EMS management platform, and a plurality of V2G charging stacks; the regional main transformer is used to step down the externally connected high-voltage commercial power to obtain grid-side AC electric energy; the charging stack power distribution cabinet is used to respectively measure the electric energy conditions of the new energy vehicles connected to each V2G charging stack and the electric energy conditions of the new energy store, and obtain charge and discharge control signals according to the control strategy; the EMS management platform is used to obtain the control strategy according to the electric energy conditions of the new energy vehicles connected to each V2G charging stack and the electric energy conditions of the new energy store; the V2G charging stack is used to convert the grid-side AC electric energy into grid DC electric energy according to the charge and discharge control signals and store it through the vehicle battery, or to convert the DC electric energy of the vehicle battery into AC electric energy according to the charge and discharge control signals. The present invention solves the problems of large power consumption in the new energy store and reduced battery life of idle new energy electric vehicles.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicles, and particularly relates to a V2G system for a new energy vehicle sales venue. Background Art

[0002] In a new energy vehicle sales venue, there are electrical loads such as elevators, air conditioners, water pumps, advertisements, and lighting. Especially in summer, the power consumption is very large. Energy conservation and emission reduction are social responsibilities under the national sustainable development policy.

[0003] Most enterprises reduce power consumption by purchasing and installing low-energy-consuming electrical equipment such as energy-saving air conditioners and lighting, and manually adjusting the working hours of electrical equipment according to seasons. In contrast, new energy vehicle sales venues have idle self-produced products that other enterprises do not have - electric vehicles, and the quantity is objective.

[0004] In addition, for idle electric vehicles, the batteries will decay after a long time of parking. Because when the vehicle is not used for a long time, since the vehicle's in-vehicle computer, anti-theft system, etc. are still working, the power battery will slowly self-discharge, thus affecting the vehicle's performance range and battery life. When the battery level drops to 0%, the battery will be permanently damaged. Summary of the Invention

[0005] Aiming at the above deficiencies in the prior art, a V2G system for a new energy vehicle sales venue provided by the present invention solves the problems of large power consumption in the new energy vehicle sales venue and reduced battery life of idle new energy electric vehicles.

[0006] In order to achieve the above invention purpose, the technical solution adopted by the present invention is: a V2G system for a new energy vehicle sales venue, including a regional main transformer, a charging pile power distribution cabinet, an EMS management platform, and a plurality of V2G charging piles;

[0007] The regional main transformer is used to step down the externally connected high-voltage mains power to obtain grid-side alternating current electrical energy;

[0008] The charging pile power distribution cabinet is used to respectively measure the electrical energy conditions of the new energy vehicles connected to each V2G charging pile and the electrical energy conditions of the new energy vehicle sales venue, and obtain charge and discharge control signals according to the control strategy;

[0009] The EMS management platform is used to obtain a control strategy according to the electrical energy conditions of the new energy vehicles connected to each V2G charging pile and the electrical energy conditions of the new energy vehicle sales venue;

[0010] The V2G charging pile is used to convert grid-side alternating current electrical energy into grid-side direct current electrical energy according to the charge and discharge control signal and store it through the vehicle battery, or to convert the vehicle battery direct current electrical energy into alternating current electrical energy according to the charge and discharge control signal for use in the new energy vehicle sales venue.

[0011] The beneficial effects of the present invention are as follows: The present invention uses the EMS management platform (the English abbreviation of Energy Management System) to communicate the V2G charging stack with the power grid system and participate in power grid dispatching. The system can use a large number of new energy electric vehicles and its own energy storage devices as energy storage carriers. When the power grid load is too high or during peak electricity consumption periods, the batteries of new energy electric vehicles feed power to the load in the power grid area; when the power grid load is low or during off-peak electricity consumption periods, the batteries of new energy electric vehicles are charged in an orderly manner to achieve bidirectional charging and discharging between electric vehicles and the power grid, playing roles such as peak shaving and valley filling, participating in the power market, and participating in the ancillary service market, solving the problem of large power consumption in new energy stores. At the same time, by activating new energy electric vehicles, the problem of reduced battery life of idle new energy electric vehicles is solved.

[0012] Further, the charging stack power distribution cabinet includes an EMS controller, a first bidirectional watt-hour meter, and a second bidirectional watt-hour meter; the EMS controller is connected to the first bidirectional watt-hour meter and the second bidirectional watt-hour meter; the EMS management platform is connected to the EMS controller through wireless communication;

[0013] The EMS controller is used to obtain charge and discharge control signals according to the control strategy;

[0014] The first bidirectional watt-hour meter is connected to the second bidirectional watt-hour meter and each V2G charging stack through power cables, and the first bidirectional watt-hour meter is used to measure the power consumption of the new energy vehicles connected to the V2G charging stack;

[0015] The second bidirectional watt-hour meter is connected to the regional main transformer through power cables, and the second bidirectional watt-hour meter is used to measure the power consumption of the new energy store.

[0016] The beneficial effects of the above further solution are as follows: By using the first bidirectional watt-hour meter and the second bidirectional watt-hour meter to measure the power consumption of each V2G charging stack and the new energy store respectively, the precondition data for the control strategy is obtained, preparing for controlling the charge and discharge of each V2G charging stack.

[0017] Further, the V2G charging stack is connected to a number of new energy electric vehicles through charging guns respectively;

[0018] The new energy electric vehicle is used to store the electric energy of the power grid or release the electric energy of the vehicle battery.

[0019] The beneficial effects of the above further solution are as follows: Flexible scheduling of new energy electric vehicles is achieved according to the charge and discharge control signals.

[0020] Further, the control strategy includes the following steps:

[0021] S1. Obtain the battery capacity C of each new energy electric vehicle connected in each V2G charging pile according to the power conditions of the new energy vehicles connected to each V2G charging pile and the power conditions of the new energy sales site ij , the upper battery charge limit SoC_max ij and the lower battery charge limit SoC_min ij ; Calculate the available battery capacity Q of each vehicle based on the above three quantities ij

[0022] S2. Obtain the sum of battery capacities ∑Q of the new energy vehicles connected to each V2G charging pile according to the available battery capacity Q of the new energy vehicles connected to each V2G charging pile ij ; j ;

[0023] S3. Sort the sum of battery capacities ∑Q of the new energy vehicles connected to each V2G charging pile from large to small to obtain the first numbered sorting vector order_stack; j

[0024] S4. Sort the available battery capacity Q of the new energy vehicles connected to each V2G charging pile from large to small to obtain the numbered sorting matrix order_EV; ij

[0025] S5. Obtain the peak time period t_peak, valley time period t_valley and normal time period t_plain respectively;

[0026] S6. Obtain the number of guns num_charger of each V2G charging pile i , the number of charge and discharge modules num_module i , the maximum charging power of a single module p_charging_max i and the maximum discharging power of a single module p_discharging_max i ;

[0027] S7. Calculate the maximum dischargeable electricity Q_peak_max of a single pile during peak hours, the maximum chargeable electricity Q_valley_max of a single pile during valley hours of each V2G charging pile respectively according to the peak time period t_peak, valley time period t_valley, normal time period t_plain, the number of charge and discharge modules num_module of each V2G charging pile i , the maximum charging power of a single module p_charging_max of each V2G charging pile i and the maximum discharging power of a single module p_discharging_max of each V2G charging pile i , i the maximum chargeable electricity Q_valley_max of a single pile during valley hours i ​​, The maximum rechargeable power of a single stack during normal times Q_plain_charging_max i and the maximum dischargeable power of a single stack during normal times Q_plain_discharging_max i :

[0028] Q_peak_max i = num_module i ·p_discharging_max i ·t_peak

[0029] Q_valley_max i = num_module i ·p_charging_max i ·t_valley

[0030] Q_plain_charging_max i = num_module i ·p_charging_max i ·t_plain

[0031] Q_plain_discharging_max i = num_module i ·p_discharging_max i ·t_plain

[0032] Among them, Q_peak_max i is the maximum dischargeable power of a single stack at peak time of the i-th V2G charging stack; Q_valley_max i is the maximum rechargeable power of a single stack at valley time of the i-th V2G charging stack; Q_plain_charging_max i is the maximum rechargeable power of a single stack during normal times of the i-th V2G charging stack; Q_plain_discharging_max i is the maximum dischargeable power of a single stack during normal times of the i-th V2G charging stack; num_module i is the number of charge-discharge modules of the i-th V2G charging stack; p_discharging_max i is the maximum discharge power of the charge-discharge module of the i-th V2G charging stack; p_charging_max i is the maximum charging power of the charge-discharge module of the i-th V2G charging stack; i is the number of the V2G charging stack;

[0033] S8. Respectively, for each V2G charging pile, obtain the maximum chargeable power of a single pile during normal times \(Q_{\text{plain charging max}}\) i and the maximum dischargeable power of a single pile during normal times \(Q_{\text{plain discharging max}}\) i Sort them from largest to smallest to obtain the second numbered sorting vector \(order_{\text{plain C}}\) and the third numbered sorting vector \(order_{\text{plain D}}\);

[0034] S9. Respectively, according to the maximum dischargeable power of a single pile during peak times \(Q_{\text{peak max}}\) of each V2G charging pile i , the maximum chargeable power of a single pile during valley times \(Q_{\text{valley max}}\) of each V2G charging pile i and the sum of the battery capacities of the new energy vehicles connected to each V2G charging pile \(\sum Q\) j , obtain the total maximum dischargeable power during peak times \(\sum Q_{\text{peak max}}\) i , the total maximum chargeable power during valley times \(\sum Q_{\text{valley max}}\) i and the total sum of battery capacities \(\sum Q\) ij ;

[0035] S10. Determine whether the minimum value among the total maximum dischargeable power during peak times \(\sum Q_{\text{peak max}}\) i , the total maximum chargeable power during valley times \(\sum Q_{\text{valley max}}\) i and the total sum of battery capacities \(\sum Q\) ij is the total maximum dischargeable power during peak times \(\sum Q_{\text{peak max}}\) i . If so, according to the number of guns \(num_{\text{charger}}\) of each V2G charging pile i , the third numbered sorting vector \(order_{\text{plain D}}\), the numbered sorting matrix \(order_{\text{EV}}\), the first numbered sorting vector \(order_{\text{stack}}\), the battery charge upper limit \(SoC_{\text{max}}\) ij and the battery charge lower limit \(SoC_{\text{min}}\) ij , execute the first strategy. Otherwise, according to the number of guns \(num_{\text{charger}}\) of each V2G charging pile i , the numbered sorting matrix \(order_{\text{EV}}\), the first numbered sorting vector \(order_{\text{stack}}\), the second numbered sorting vector \(order_{\text{plain C}}\), the battery charge upper limit \(SoC_{\text{max}}\) ij and the battery charge lower limit \(SoC_{\text{min}}\) ij , execute the second strategy.

[0036] The beneficial effects of the above further solution are as follows: By analyzing the battery conditions of each new energy electric vehicle under each charging pile through a control strategy, and taking the pile as a unit, overall allocation of each new energy electric vehicle is carried out to maximize the utilization degree of the batteries of each new energy electric vehicle, effectively reducing the power cost of the new energy sales area. At the same time, by activating the batteries of idle new energy electric vehicles, the attenuation rate of the battery life of new energy electric vehicles is reduced.

[0037] Further, the specific content of the first strategy in step S10 is as follows:

[0038] A1. Determine the current time period. If it is the valley time period t_valley, each V2G charging pile, according to the number of charging guns num_charger of each V2G charging pile i , the number sorting matrix order_EV, and the upper limit of battery charge SoC_max ij , uses the value of the maximum chargeable power Q_valley_max per pile during valley hours i as the charging amount of all V2G charging piles, and charges according to the charging strategy;

[0039] If it is the peak time period t_peak, each V2G charging pile, according to the number of charging guns num_charger of each V2G charging pile i , the number sorting matrix order_EV, and the lower limit of battery charge SoC_min ij , uses the value of the maximum dischargeable power Q_peak_max per pile during peak hours i as the discharge amount of all V2G charging piles, and discharges according to the discharge strategy;

[0040] If it is the normal time period t_plain, go to step A2;

[0041] A2. Calculate the discharge amount Q_plain_discharging during normal hours:

[0042]

[0043] Among them, Q_plain_discharging is the discharge amount during normal hours; x is the formula selection symbol identifier. When x = 1, it means that the battery capacity and the total amount ∑Q ij are less than or equal to the total amount ∑Q_valley_max of the maximum chargeable power during valley hours i , and when x = 2, it means that the battery capacity and the total amount ∑Q ij are greater than the total amount ∑Q_valley_max of the maximum chargeable power during valley hours i ;

[0044] A3. Sort the discharge stack set according to the third number sorting vector order_plain_D, with the first number sorting vector order_stack as the secondary order; the discharge stack set is the first n stacks in the third number sorting vector order_plain_D, and the discharge stack set is the smallest set that satisfies the sum of the maximum discharge powers Q_plain_discharging_max of n stacks not less than the discharge power Q_plain_discharging during normal periods. i The sum is not less than the minimum set of the discharge amount Q_plain_discharging during the normal period;

[0045] A4. Calculate the discharge amount Q_discharging of each V2G charging stack according to the discharge stack set i :

[0046]

[0047] Among them, Q_discharging i is the discharge amount of the i-th V2G charging stack; ∑Q_plain_discharging_max order_plain_D[1～n-1] is the sum of the discharge amounts of the V2G charging stacks with serial numbers [1, (n - 1)] in the third number sorting vector order_plain_D, and Q_plain_discharging_max order_plain_D[1～n-1] is the discharge amount of the V2G charging stack with the serial number order_plain_D[1~n - 1] in the third number sorting vector order_plain_D, and order_plain_D[1~n - 1] is the serial number of the V2G charging stack in the third number sorting vector order_plain_D;

[0048] A5. According to the number of guns num_charger i of each V2G charging stack, the number sorting matrix order_EV and the lower limit of the battery charge SoC_min ij , each V2G charging stack discharges each new energy electric vehicle according to the discharge strategy according to the discharge amount Q_discharging i of each V2G charging stack.

[0049] The beneficial effects of the above further solution are as follows: Based on the total available battery capacity of the battery stacks, the total maximum discharge power during peak hours, and the total maximum charge power during valley hours, further analyze the situation of each new energy electric vehicle in each stack, select the charging strategy and discharge strategy, and make overall allocation of each new energy electric vehicle according to the third numbered sorting vector, numbered sorting matrix, first numbered sorting vector, upper battery charge limit, and lower battery charge limit, so as to maximize the utilization degree of the batteries of each new energy electric vehicle, effectively reduce the power cost of the new energy sales lot, and at the same time, by activating the batteries of idle new energy electric vehicles, reduce the attenuation rate of the battery life of new energy electric vehicles.

[0050] Further, the charging strategy in step A1 is specifically as follows:

[0051] B1. According to the number of guns num_charger of each V2G charging stack i , obtain the number of unused charging guns connected to the V2G charging stack;

[0052] B2. Determine whether the number of unused charging guns in the V2G charging stack is 0. If so, go to step B4; otherwise, go to step B3;

[0053] B3. According to the numbered sorting matrix order_EV, start the charging guns in sequence according to the number of unused charging guns, and successively determine whether each new energy electric vehicle connected to the V2G charging stack reaches the upper battery charge limit SoC_max ij . If so, stop charging this new energy electric vehicle; otherwise, go to step B4;

[0054] B4. Read the cumulative charge Q_r_charging of the charging gun in the V2G charging stack;

[0055] B5. Determine whether the cumulative charge Q_r_charging of the charging gun reaches the charge amount Q_charging of this V2G charging stack i . If so, end the charging; otherwise, return to step B2.

[0056] The beneficial effects of the above further solution are as follows: Through the charging strategy, make overall allocation of each new energy electric vehicle in a single stack, complete the charge amount of a single stack, realize the charging of the batteries of each new energy electric vehicle, obtain energy storage, prepare for subsequent discharging, and at the same time, by activating the batteries of idle new energy electric vehicles, reduce the attenuation rate of the battery life of new energy electric vehicles.

[0057] Further, the discharge strategy in step A1 or A5 is specifically as follows:

[0058] C1. According to the number of guns num_charger of each V2G charging stack i, obtain the number of charging guns with V2G charging pile connection not enabled;

[0059] C2. Determine whether the number of charging guns not enabled in the V2G charging pile is 0. If so, go to step C4; otherwise, go to step C3;

[0060] C3. According to the number sorting matrix order_EV, start the charging guns in sequence according to the number of charging guns not enabled, and sequentially determine whether the battery state of charge (SoC) of each new energy electric vehicle connected to the V2G charging pile reaches the lower limit SoC_min ij , if so, this new energy electric vehicle stops discharging; otherwise, go to step C4;

[0061] C4. Read the cumulative discharge amount Q_r_discharging of the charging guns in the V2G charging pile;

[0062] C5. Determine whether the cumulative discharge amount Q_r_discharging of the charging gun reaches the discharge amount Q_discharging of this V2G charging pile i , if so, end the discharging; otherwise, return to step C2.

[0063] The beneficial effects of the above further solution are as follows: Through the discharging strategy, the new energy electric vehicles in a single pile are coordinated and allocated to complete the discharge amount of a single pile, realizing the discharging of the batteries of new energy electric vehicles and supplying power to the new energy sales site, effectively reducing the power cost of the new energy sales site. At the same time, by activating the batteries of idle new energy electric vehicles, the attenuation rate of the battery life of new energy electric vehicles is reduced.

[0064] Further, the second strategy in step S10 is specifically as follows:

[0065] D1. Determine the current time period. If it is the valley period t_valley, then each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the number sorting matrix order_EV and the upper limit of battery state of charge SoC_max ij , uses the value of the maximum chargeable amount per pile during valley hours Q_valley_max i as the charge amount of all V2G charging piles and charges according to the charging strategy;

[0066] If it is the peak period t_peak, then each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the number sorting matrix order_EV and the lower limit of battery state of charge SoC_min ij , uses the value of the maximum dischargeable amount per pile during peak hours Q_peak_max iUse the value as the discharge amount of all V2G charging piles and discharge according to the discharge strategy;

[0067] If it is the normal period t_plain, go to step B2;

[0068] D2. Calculate the charging amount Q_plain_charging during the normal period:

[0069]

[0070] Among them, Q_plain_charging is the charging amount during the normal period; y is the formula selection symbol identifier. When y = 1, it represents the minimum value among the battery capacity and the total amount ∑Q ij which is the total amount of the maximum dischargeable electricity during the peak period ∑Q_peak_max i the total amount of the maximum chargeable electricity during the valley period ∑Q_valley_max i and the battery capacity and the total amount ∑Q ij When y = 2, it represents the total amount of the maximum chargeable electricity during the valley period ∑Q_valley_max i which is the total amount of the maximum dischargeable electricity during the peak period ∑Q_peak_max i the total amount of the maximum chargeable electricity during the valley period ∑Q_valley_max i and the battery capacity and the total amount ∑Q ij and the total amount of the maximum dischargeable electricity during the peak period ∑Q_peak_max i is not less than the battery capacity and the total amount ∑Q ij When y = 3, it represents the total amount of the maximum chargeable electricity during the valley period ∑Q_valley_max i which is the total amount of the maximum dischargeable electricity during the peak period ∑Q_peak_max i the total amount of the maximum chargeable electricity during the valley period ∑Q_valley_max i and the battery capacity and the total amount ∑Q ij and the total amount of the maximum dischargeable electricity during the peak period ∑Q_peak_max i is less than the battery capacity and the total amount ∑Q ij ; min is the minimum value function; ∑Q_resi ij is the sum of the remaining available battery capacities of each new energy electric vehicle connected to all V2G charging piles, Q_resi ij is the remaining available battery capacity of the jth new energy electric vehicle connected to the ith pile, and j is the new energy electric vehicle number;

[0071] D3. According to the second-number sorting vector order_plain_C, with the first-number sorting vector order_stack as the secondary order, obtain the charging pile set; the charging pile set is the first m piles in the second-number sorting vector order_plain_C, and the charging pile set is the smallest set that satisfies the sum of the maximum chargeable power Q_plain_charging_max of m piles not less than the charging amount Q_plain_charging during normal periods. i The sum is not less than the minimum set of the charging amount Q_plain_charging during normal periods;

[0072] D4. According to the charging pile set, calculate the charging amount Q_charging of each V2G charging pile i :

[0073]

[0074] Among them, Q_charging i is the charging amount of the i-th V2G charging pile; ∑Q_plain_charging_max order_plain_C[1～m-1] is the sum of the charging amounts of the V2G charging piles with serial numbers [1, (m - 1)] in the second-number sorting vector order_plain_C, and Q_plain_charging_max order_plain_C[1～m-1] is the charging amount of the V2G charging pile with the serial number order_plain_C[1~m - 1] in the second-number sorting vector order_plain_C, and order_plain_C[1~m - 1] is the serial number of the V2G charging pile in the second-number sorting vector order_plain_C;

[0075] D5. According to the number of guns num_charger of each V2G charging pile i , the number sorting matrix order_EV and the battery charge lower limit SoC_min ij , each V2G charging pile charges each new energy electric vehicle according to the charging strategy according to the charging amount Q_charging i of each V2G charging pile.

[0076] The beneficial effects of the above further solution are as follows: Based on the total available battery capacity of the total stack, the total maximum discharge power during peak hours, and the total maximum charge power during valley hours, further analyze the situation of each new energy electric vehicle in each stack, select the charging strategy and discharge strategy, and according to the number sorting matrix, the first number sorting vector, the second number sorting vector, the upper limit of battery charge and the lower limit of battery charge, make overall allocation of each new energy electric vehicle, maximize the utilization degree of the batteries of each new energy electric vehicle, effectively reduce the power cost of the new energy sales field, and at the same time, by activating the batteries of idle new energy electric vehicles, reduce the attenuation speed of the battery life of new energy electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is the system structure diagram of the present invention.

[0078] Figure 2 It is the electric energy flow diagram of the charging scenario of the power system in the present invention.

[0079] Figure 3 It is the electric energy flow diagram of the discharging scenario of the power system in the present invention.

[0080] Figure 4 It is the network topology diagram of the wireless communication system scenario in the present invention.

[0081] Figure 5 It is the network topology diagram of the second scenario of the wired communication system in the present invention.

[0082] Figure 6 It is the control strategy flow chart in the present invention.

[0083] Figure 7 It is the first strategy flow chart in the present invention.

[0084] Figure 8 It is the charging strategy flow chart in the present invention.

[0085] Figure 9 It is the discharging strategy flow chart in the present invention.

[0086] Figure 10 It is the second strategy flow chart in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0087] The following describes the specific implementation manners of the present invention to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation manners. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions made using the inventive concept of the present invention are within the scope of protection.

[0088] Such as Figure 1As shown in the figure, in an embodiment of the present invention, a new energy store V2G system includes a regional main transformer, a charging stack power distribution cabinet, an EMS management platform, and a number of V2G charging stacks;

[0089] The regional main transformer is used to step down the externally connected high-voltage mains power to obtain grid-side AC electrical energy;

[0090] The charging stack power distribution cabinet is used to separately measure the electrical energy conditions of the new energy vehicles connected to each V2G charging stack and the electrical energy conditions of the new energy store, and obtain charge and discharge control signals according to the control strategy;

[0091] The EMS management platform is used to obtain the control strategy according to the electrical energy conditions of the new energy vehicles connected to each V2G charging stack and the electrical energy conditions of the new energy store;

[0092] The V2G charging stack is used to convert the grid-side AC electrical energy into grid DC electrical energy according to the charge and discharge control signal and store it through the vehicle battery, or to convert the DC electrical energy of the vehicle battery into AC electrical energy according to the charge and discharge control signal for use in the new energy store.

[0093] In this embodiment, the present invention charges the electric vehicle to full capacity through the V2G charging stack during the valley period of the electricity price according to the local peak-valley electricity price period, and feeds the electrical energy of the electric vehicle into the store's electricity load through the V2G charging stack during the peak period of the electricity price, reducing the store's power consumption. At the same time, it activates the new energy electric vehicle and reduces the battery life attenuation rate of the new energy electric vehicle.

[0094] In this embodiment, the system includes equipment such as new energy electric vehicles, V2G charging stacks, bidirectional electric energy meters, cloud control EMS controllers, and charging stack power distribution cabinets; the system is connected from the 10kV high-voltage mains to the regional main transformer (10kV / 0.4kV) within the access area. The main transformer is divided into multiple feeders to different enterprises, providing AC380V three-phase AC mains power for enterprise use. Each enterprise may have corresponding main switch cabinets and incoming and outgoing line switch cabinets;

[0095] The new energy electric vehicles are inherently produced by the store enterprises and are most new energy electric vehicles on the market. A very small number of electric vehicles may not support the V2G function due to their relatively old production years, and the corresponding brand vehicle enterprises can be consulted.

[0096] The V2G charging stack includes a charging stack main cabinet, a charging terminal cabinet, and a bidirectional AC / DC module, a control unit, a DC contactor, a molded case circuit breaker, a system power supply installed in the main cabinet, and other necessary functional devices for the charging stack. The rated power of the V2G charging stack is divided into two specifications: 30kW / 60kW, and the number of charging terminals is 2 / 4 / 6 (optional). The power, quantity, and number of charging terminals of the V2G charging stack are customized according to the actual needs of the enterprise.

[0097] The bidirectional AC / DC module consists of multiple bidirectional high-frequency switching rectifier modules, which can be flexibly configured according to the charging demand of electric vehicles. It can convert the AC power on the grid side into the DC power required for electric vehicle charging to charge the electric vehicle, and can also convert the DC power of the electric vehicle battery into AC power and feed it back to the AC grid to achieve an orderly power interaction between the AC grid and the electric vehicle.

[0098] In the new energy store, the feeder is divided into two types: V2G charging pile power distribution and power distribution for other electrical loads in the store such as elevators, air conditioners, and lighting. The V2G charging pile power distribution is in a separate cabinet, which contains a main circuit breaker, branch circuit breakers for each V2G charging pile, a bidirectional power meter, current transformers, a cloud control EMS controller and other devices and equipment. There may be corresponding control switch cabinets for other electrical loads in the store;

[0099] Devices such as each V2G charging pile and the bidirectional power meter are connected to the cloud control EMS controller through network integration, and the cloud control EMS controller communicates wirelessly with the cloud EMS management platform. The platform reads the data of each power meter according to the strategy operation and controls and allocates the status of the V2G charging pile;

[0100] The power, quantity of V2G charging piles, and the number of charging terminals are selected according to the actual needs of the store. In this figure, n represents the number of V2G charging piles, and 4 charging terminals controlled by each V2G charging pile are taken as an example.

[0101] The cloud control EMS controller is used to communicate with devices such as V2G charging piles and power meters in the system, coordinate and control the orderly operation of V2G charging piles and the switching of charge and discharge functions, and realize the power interaction management between electric vehicles and store loads, as well as the AC grid.

[0102] The charging pile power distribution cabinet includes an EMS controller, a first bidirectional power meter, and a second bidirectional power meter; the EMS controller is connected to the first bidirectional power meter and the second bidirectional power meter; the EMS management platform is connected to the EMS controller through wireless communication;

[0103] The EMS controller is used to obtain charge and discharge control signals according to the control strategy;

[0104] The first bidirectional power meter is connected to the second bidirectional power meter and each V2G charging pile through power cables. The first bidirectional power meter is used to measure the power situation of the new energy vehicles connected to the V2G charging pile;

[0105] The second bidirectional power meter is connected to the regional main transformer through power cables. The second bidirectional power meter is used to measure the power situation of the new energy store.

[0106] In this embodiment, the first or second two-way power acquisition meter is mainly used to measure the three-phase active power of the low-voltage network, including forward and reverse directions, with small size and high precision, supporting multiple communication methods such as RS485, 4G, and Wifi, and can meet the requirements of sub-item power metering, operation and maintenance supervision, and power monitoring for different regions and different loads.

[0107] The V2G charging pile is respectively connected to a number of new energy electric vehicles through charging guns;

[0108] The new energy electric vehicle is used to store the electric energy of the power grid or release the electric energy of the vehicle battery.

[0109] The EMS controller is connected to the first two-way power meter and the second two-way power meter; the EMS management platform is connected to the EMS controller through wireless communication;

[0110] In actual use, the system is configured with two communication methods: wireless communication and wired communication, which can prevent the operation failure of the system caused by communication cable faults or poor wireless signals, and improve the operation stability of the system.

[0111] In this embodiment, according to the differences between the power system and the communication system, the present invention is mainly divided into the following scenarios:

[0112] The first is the power system charging scenario:

[0113] The power consumption scenario when the V2G charging pile charges the electric vehicle at the valley price of the electricity price. The power flow of the system in this scenario is as shown in the appendix Figure 2 As shown. In this scenario, the electric energy flows from the 10kV high-voltage municipal power supply, through the 10kV / 0.4kV regional main transformer for step-down, to the shopping mall power consumption load and the charging pile power distribution cabinet. The charging pile power distribution cabinet distributes the electric energy according to the power demand of each V2G charging pile to charge the electric vehicle. Among them, the main function of the first two-way power meter is to measure the electric energy used by the V2G charging pile; the main function of the second two-way power meter is to measure the total electric energy used by the new energy shopping mall.

[0114] The second is the power system discharging scenario

[0115] The power consumption scenario when the V2G charging pile discharges the electric vehicle at the peak price of the electricity price. The electric energy released by the new energy vehicle is jointly consumed by the shopping mall load and other power-consuming enterprises in the regional main transformer. The power flow of the system in this scenario is as shown in the appendix Figure 3 As shown. In this scenario, the V2G charging pile is controlled by a strategy to discharge the electric vehicle at the peak price of the electricity price. The released electric energy passes through the charging pile power distribution cabinet and is jointly consumed by the shopping mall load and other power-consuming enterprises in the power grid area. Among them, the main function of the first two-way power meter is to measure the electric energy fed back by the V2G charging pile at the peak price; the main function of the second two-way power meter is to measure the total electric energy fed into the grid by the new energy shopping mall. This electric energy measurement value is used for calculating the selling electricity fee income.

[0116] The third type is the wireless communication system scenario

[0117] The new energy store parking lot is built on the ground with an open environment and no serious obstruction, and the 4G / 5G communication signal is good. In this scenario, the V2G charging pile and the two-way electricity meter communicate with the cloud EMS management platform through the 4G / 5G signal. The network topology of this scenario system is as attached Figure 4 shown

[0118] The fourth type is the wired communication system scenario

[0119] The new energy store parking lot is built on the ground but has serious obstruction, and the 4G / 5G communication signal is poor, or the parking lot is built underground. In this scenario, the V2G charging pile and the two-way electricity meter communicate with the cloud control EMS controller through the connected network cable, and the cloud control EMS controller connects to the external network (wireless network) and docks with the MES management cloud platform. The network topology of this scenario system is as attached Figure 5 shown

[0120] As Figure 6 shown, the control strategy includes the following steps

[0121] S1. According to the power conditions of the new energy vehicles connected to each V2G charging pile and the power conditions of the new energy store, obtain the available battery capacity Q ij , the upper battery charge limit SoC_max ij and the lower battery charge limit SoC_min ij of each new energy electric vehicle connected in each V2G charging pile

[0122] S2. According to the available battery capacity Q ij of the new energy vehicles connected to each V2G charging pile, obtain the sum of the battery capacities ∑Q j of the new energy vehicles connected to each V2G charging pile

[0123] S3. Sort the sum of the battery capacities ∑Q j of the new energy vehicles connected to each V2G charging pile from large to small to obtain the first numbered sorting vector order_stack

[0124] S4. Sort the available battery capacity Q ij of the new energy vehicles connected to each V2G charging pile from large to small to obtain the numbered sorting matrix order_EV

[0125] S5. Obtain the peak period t_peak, the valley period t_valley and the normal period t_plain respectively

[0126] S6. Obtain the number of guns num_charger of each V2G charging pile i, the number of charge and discharge modules num_module i , the maximum charging power per module p_charging_max i and the maximum discharging power per module p_discharging_max i ;

[0127] S7. According to the peak time period t_peak, valley time period t_valley, normal time period t_plain, the number of charge and discharge modules num_module of each V2G charging pile i , the maximum charging power per module p_charging_max of each V2G charging pile i and the maximum discharging power per module p_discharging_max of each V2G charging pile i , calculate respectively the maximum dischargeable electricity Q_peak_max of each V2G charging pile during peak hours i , the maximum chargeable electricity Q_valley_max of each V2G charging pile during valley hours i , the maximum chargeable electricity Q_plain_charging_max of each V2G charging pile during normal hours i and the maximum dischargeable electricity Q_plain_discharging_max of each V2G charging pile during normal hours i :

[0128] Q_peak_max i = num_module i · p_discharging_max i · t_peak

[0129] Q_valley_max i = num_module i · p_charging_max i · t_valley

[0130] Q_plain_charging_max i = num_module i · p_charging_max i · t_plain

[0131] Q_plain_discharging_max i = num_module i · p_discharging_max i · t_plain

[0132] Among them, Q_peak_max iis the maximum dischargeable power of the i-th V2G charging pile during peak hours; Q_valley_max i is the maximum chargeable power of the i-th V2G charging pile during valley hours; Q_plain_charging_max i is the maximum chargeable power of the i-th V2G charging pile during normal hours; Q_plain_discharging_max i is the maximum dischargeable power of the i-th V2G charging pile during normal hours; num_module i is the number of charge-discharge modules of the i-th V2G charging pile; p_discharging_max i is the maximum discharge power of the charge-discharge module of the i-th V2G charging pile; p_charging_max i is the maximum charge power of the charge-discharge module of the i-th V2G charging pile; i is the number of the V2G charging pile;

[0133] S8. Respectively, sort the maximum chargeable power Q_plain_charging_max of each V2G charging pile during normal hours i and the maximum dischargeable power Q_plain_discharging_max of each V2G charging pile during normal hours i in descending order to obtain the second numbered sorting vector order_plain_C and the third numbered sorting vector order_plain_D;

[0134] S9. Respectively, according to the maximum dischargeable power Q_peak_max of each V2G charging pile during peak hours i , the maximum chargeable power Q_valley_max of each V2G charging pile during valley hours i and the battery capacity sum ∑Q of the new energy vehicles connected to each V2G charging pile j , obtain the total maximum dischargeable power ∑Q_peak_max during peak hours i , the total maximum chargeable power ∑Q_valley_max during valley hours i and the total battery capacity sum ∑Q ij ;

[0135] S10. Judge whether the minimum value among the total maximum dischargeable power ∑Q_peak_max during peak hours i , the total maximum chargeable power ∑Q_valley_max during valley hours i and the total battery capacity sum ∑Q ij is the total maximum dischargeable power ∑Q_peak_max during peak hours i , if so, then according to the number of guns num_charger of each V2G charging pile i, the third numbered sorting vector order_plain_D, the numbered sorting matrix order_EV, the first numbered sorting vector order_stack, the upper battery charge limit SoC_max ij and the lower battery charge limit SoC_min ij , execute the first strategy; otherwise, according to the number of guns num_charger of each V2G charging pile i , the numbered sorting matrix order_EV, the first numbered sorting vector order_stack, the second numbered sorting vector order_plain_C, the upper battery charge limit SoC_max ij and the lower battery charge limit SoC_min ij , execute the second strategy.

[0136] As Figure 7 shown, the specific content of the first strategy in step S10 is as follows:

[0137] A1. Determine the current time period. If it is the valley period t_valley, then each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the numbered sorting matrix order_EV and the upper battery charge limit SoC_max ij , uses the value of the maximum chargeable power per pile Q_valley_max i during the valley period as the charge amount of all V2G charging piles, and charges according to the charging strategy;

[0138] If it is the peak period t_peak, then each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the numbered sorting matrix order_EV and the lower battery charge limit SoC_min ij , uses the value of the maximum dischargeable power per pile Q_peak_max i during the peak period as the discharge amount of all V2G charging piles, and discharges according to the discharge strategy;

[0139] If it is the normal period t_plain, then go to step A2;

[0140] A2. Calculate the discharge amount Q_plain_discharging during the normal period:

[0141]

[0142] Among them, Q_plain_discharging is the discharge amount during the normal period; x is the formula selection symbol identifier. When x = 1, it means that the battery capacity and the total amount ∑Q ij is less than or equal to the total amount of the maximum chargeable power during the valley period ∑Q_valley_maxi , when x = 2, it represents the battery capacity and the total amount ∑Q ij is greater than the maximum rechargeable power total amount ∑Q_valley_max at the valley i ;

[0143] A3. According to the third-number sorting vector order_plain_D, with the first-number sorting vector order_stack as the secondary order, obtain the discharge stack set; the discharge stack set is the first n stacks in the third-number sorting vector order_plain_D, and the discharge stack set is the smallest set that satisfies the sum of the maximum single-stack discharge powers Q_plain_discharging_max of n stacks is not less than the normal-time discharge power Q_plain_discharging i ;

[0144] A4. According to the discharge stack set, calculate the discharge power Q_discharging of each V2G charging stack i :

[0145]

[0146] where Q_discharging i is the discharge power of the i-th V2G charging stack; ∑Q_plain_discharging_max order_plain_D[1～n-1] is the sum of the discharge powers of the V2G charging stacks with serial numbers [1, (n - 1)] in the third-number sorting vector order_plain_D, Q_plain_discharging_max order_plain_D[1～n-1] is the discharge power of the V2G charging stacks with serial numbers order_plain_D[1~n - 1] in the third-number sorting vector order_plain_D, and order_plain_D[1~n - 1] is the serial numbers of the V2G charging stacks in the third-number sorting vector order_plain_D

[0147] A5. According to the number of guns num_charger i of each V2G charging stack, the number sorting matrix order_EV and the battery charge lower limit SoC_min ij , each V2G charging stack discharges each new energy electric vehicle according to the discharge strategy according to the discharge power Q_discharging i of each V2G charging stack

[0148] As Figure 8 shown, the charging strategy in step A1 is specifically as follows

[0149] B1. Obtain the number of unactivated charging guns connected to the V2G charging pile according to the number of guns num_charger of each V2G charging pile i , and obtain the number of unactivated charging guns connected to the V2G charging pile;

[0150] B2. Determine whether the number of unactivated charging guns in the V2G charging pile is 0. If so, go to step B4; otherwise, go to step B3;

[0151] B3. According to the number sorting matrix order_EV, start the charging guns in sequence according to the number of unactivated charging guns, and sequentially determine whether the battery state of charge (SoC) of each new energy electric vehicle connected to the V2G charging pile reaches the upper limit SoC_max ij , if so, the new energy electric vehicle stops charging; otherwise, go to step B4;

[0152] B4. Read the cumulative charging amount Q_r_charging of the charging guns in the V2G charging pile;

[0153] B5. Determine whether the cumulative charging amount Q_r_charging of the charging gun reaches the charging amount Q_charging of the V2G charging pile i , if so, end the charging; otherwise, return to step B2.

[0154] As Figure 9 shown, the specific discharging strategy in step A1 or A5 is as follows:

[0155] C1. Obtain the number of unactivated charging guns connected to the V2G charging pile according to the number of guns num_charger of each V2G charging pile i , and obtain the number of unactivated charging guns connected to the V2G charging pile;

[0156] C2. Determine whether the number of unactivated charging guns in the V2G charging pile is 0. If so, go to step C4; otherwise, go to step C3;

[0157] C3. According to the number sorting matrix order_EV, start the charging guns in sequence according to the number of unactivated charging guns, and sequentially determine whether the battery state of charge (SoC) of each new energy electric vehicle connected to the V2G charging pile reaches the lower limit SoC_min ij , if so, the new energy electric vehicle stops discharging; otherwise, go to step C4;

[0158] C4. Read the cumulative discharging amount Q_r_discharging of the charging guns in the V2G charging pile;

[0159] C5. Determine whether the cumulative discharging amount Q_r_discharging of the charging gun reaches the discharging amount Q_discharging of the V2G charging pile i , if so, end the discharging; otherwise, return to step C2.

[0160] As Figure 10 shown, the specific second strategy in step S10 is as follows:

[0161] D1. Judge the current time period. If it is the valley period t_valley, each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the number sorting matrix order_EV and the upper limit of battery state of charge SoC_max ij , uses the value of the maximum chargeable amount per pile Q_valley_max i during the valley period as the charge amount of all V2G charging piles and charges according to the charging strategy;

[0162] If it is the peak period t_peak, each V2G charging pile, according to the number of guns num_charger of each V2G charging pile i , the number sorting matrix order_EV and the lower limit of battery state of charge SoC_min ij , uses the value of the maximum dischargeable amount per pile Q_peak_max i during the peak period as the discharge amount of all V2G charging piles and discharges according to the discharge strategy;

[0163] If it is the normal period t_plain, go to step B2;

[0164] D2. Calculate the charging amount Q_plain_charging during the normal period:

[0165]

[0166] Among them, Q_plain_charging is the charging amount during the normal period; y is the formula selection symbol identifier. When y = 1, it means that the battery capacity and the total amount ∑Q ij is the total amount of the maximum dischargeable amount ∑Q_peak_max i during the peak period, the total amount of the maximum chargeable amount ∑Q_valley_max i during the valley period, and the minimum value among the battery capacity and the total amount ∑Q ij . When y = 2, it means that the total amount of the maximum chargeable amount ∑Q_valley_max i during the valley period is the total amount of the maximum dischargeable amount ∑Q_peak_max i during the peak period, the total amount of the maximum chargeable amount ∑Q_valley_max i during the valley period, and the minimum value among the battery capacity and the total amount ∑Q ij , and the total amount of the maximum dischargeable amount ∑Q_peak_max i during the peak period is not less than the battery capacity and the total amount ∑Q ij, when y = 3, it represents the total maximum chargeable energy during valley period ∑Q_valley_max i is the total maximum dischargeable energy during peak period ∑Q_peak_max i , the total maximum chargeable energy during valley period ∑Q_valley_max i and the sum of battery capacities ∑Q ij is the minimum value among them, and the total maximum dischargeable energy during peak period ∑Q_peak_max i is less than the sum of battery capacities ∑Q ij ; min is the minimum value function; ∑Q_resi ij is the sum of the remaining available battery capacities of all new energy electric vehicles connected to the V2G charging stations, Q_resi ij is the remaining available battery capacity of the j-th new energy electric vehicle connected to the i-th charging station, and j is the number of the new energy electric vehicle;

[0167] D3. According to the second-number sorting vector order_plain_C, with the first-number sorting vector order_stack as the secondary order, obtain the set of charging stations; the set of charging stations is the first m charging stations in the second-number sorting vector order_plain_C, and the set of charging stations is the smallest set that satisfies the sum of the maximum chargeable energy of each charging station during normal period Q_plain_charging_max i is not less than the charging amount during normal period Q_plain_charging;

[0168] D4. According to the set of charging stations, calculate the charging amount Q_charging of each V2G charging station i :

[0169]

[0170] where Q_charging i is the charging amount of the i-th V2G charging station; ∑Q_plain_charging_max order_plain_C[1～m-1] is the sum of the charging amounts of the V2G charging stations with serial numbers [1, (m - 1)] in the second-number sorting vector order_plain_C, Q_plain_charging_max order_plain_C[1～m-1] is the charging amount of the V2G charging station with the serial number order_plain_C[1~m - 1] in the second-number sorting vector order_plain_C, and order_plain_C[1~m - 1] is the serial number of the V2G charging station in the second-number sorting vector order_plain_C;

[0171] D5. According to the number of guns num_charger of each V2G charging stationi , the numbered sorting matrix order_EV and the lower limit of battery charge SoC_min ij , each V2G charging stack charges each new energy electric vehicle according to the charging strategy and the charging amount Q_charging of each V2G charging stack i .

[0172] In this embodiment, the control strategy is divided into 3 levels in total. Among them, the first level is responsible for reading the data of each stack and overallocating the control strategy. The second level is responsible for allocating the charging and discharging tasks to specific stacks according to the time period. The third level is responsible for executing the charging and discharging of each stack in the stack according to the specific charging task of a single stack.

[0173] The overall idea of the control strategy is to first read the relevant parameters of each vehicle and each stack and calculate the quantities required for control, and then allocate 2 major categories and 5 sub-categories of control strategies according to the size relationship between the maximum dischargeable electricity quantity (∑Q_peak_max i ) during the peak period, the maximum chargeable electricity quantity (∑Q_valley_max i ) during the valley period, and the battery capacity and total quantity (∑Q ij ) of each vehicle.

[0174] Q_peak_max i = num_module i ·p_discharging_max i ·t_peak

[0175] Q_valley_max i = num_module i ·p_charging_max i ·t_valley

[0176] Q_plain_charging_max i = num_module i ·p_charging_max i ·t_plain

[0177] Q_plain_discharging_max i = num_module i ·p_discharging_max i ·t_plain

[0178] Both Strategy 1_1 and Strategy 1_2 are strategies for discharging during normal periods. The overall idea is to first judge the current time period: if it is in the valley period, each stack charges with the maximum power to the maximum charging amount during the valley period (∑Q_valley_maxi ); If it is the peak period, each stack discharges at the maximum discharge amount during the peak time with the maximum power (∑Q_peak_max i ); If it is the normal period, calculate the discharge amount required during the normal period:

[0179]

[0180] Then find the first n stacks that can meet the discharge amount requirement during the normal period among the stacks sorted by the maximum available discharge amount during the normal period, and calculate the discharge amount of each stack:

[0181]

[0182] In the formula, N is the total number of charging stacks. Finally, send the discharge tasks of each stack to the specific charging stack.

[0183] Similarly, Strategy 2_1, Strategy 2_2, and Strategy 2_3 are all strategies for charging during the normal period. The general idea is to first judge the current period: If it is the valley period, each stack charges at the maximum charging amount during the valley time with the maximum power (∑Q_valley_max i ); If it is the peak period, each stack discharges at the maximum discharge amount during the peak time with the maximum power (∑Q_peak_max i ); If it is the normal period, calculate the charging amount required during the normal period:

[0184]

[0185] Then find the first n stacks that can meet the charging amount requirement during the normal period among the stacks sorted by the maximum available charging amount during the normal period, and calculate the charging amount of each stack:

[0186]

[0187] In the formula, N is the total number of charging stacks. Finally, send the charging tasks of each stack to the specific charging stack.

[0188] The general idea of each stack's time-sharing multiplexing for charging vehicles is that after the charging and discharging stack receives the specific charging task, it starts all the charging and discharging modules in the stack and charges each vehicle one by one according to the sorting of the available power until the charging amount issued in the charging task is completed.

[0189] Similarly, the general idea of each stack's time-sharing multiplexing for discharging vehicles is that after the charging and discharging stack receives the specific discharge task, it starts all the charging and discharging modules in the stack and discharges each vehicle one by one according to the sorting of the available power until the discharge amount issued in the discharge task is completed.

Claims

1. A new energy store V2G system, characterized in that, It includes a regional main transformer, a charging pile power distribution cabinet, an EMS management platform, and several V2G charging piles; The regional main transformer is used to step down the externally connected high-voltage municipal power supply to obtain grid-side AC electrical energy; The charging pile power distribution cabinet is used to respectively measure the electrical energy conditions of the new energy vehicles connected to each V2G charging pile and the electrical energy conditions of the new energy sales site, and obtain charge and discharge control signals according to the control strategy; The EMS management platform is used to obtain the control strategy according to the electrical energy conditions of the new energy vehicles connected to each V2G charging pile and the electrical energy conditions of the new energy sales site; the control strategy includes the following steps: S1. Obtain the battery capacity, the upper battery charge limit, and the lower battery charge limit of each new energy electric vehicle connected in each V2G charging pile according to the electric energy conditions of the new energy vehicles connected to each V2G charging pile and the electric energy conditions of the new energy sales site; calculate the available battery capacity of each new energy electric vehicle based on the above three quantities , the upper battery charge limit and the lower battery charge limit ; calculate the available battery capacity of each new energy electric vehicle based on the above three quantities S2. Obtain the sum of the battery capacities of the new energy vehicles connected to each V2G charging pile according to the available battery capacity of the new energy vehicles connected to each V2G charging pile ; ; S3. Sort the battery capacities of the new energy vehicles connected to each V2G charging pile in descending order to obtain the first numbered sorting vector ; ; S4. The available battery capacity of the new energy vehicles connected to each V2G charging pile is sorted from large to small to obtain a numbered sorting matrix ; S5. Obtain the peak period, valley period, and normal period respectively; S6. Obtain the number of charging guns for each V2G charging pile , the number of charge and discharge modules , the maximum charging power of a single module and the maximum discharging power of a single module ; S7. According to the peak period , valley period , normal period , the number of charge and discharge modules of each V2G charging stack , the maximum charging power of a single module of each V2G charging stack and the maximum discharge power of a single module of each V2G charging stack , calculate the maximum dischargeable electricity of a single stack during the peak period , the maximum chargeable electricity of a single stack during the valley period , the maximum chargeable electricity of a single stack during the normal period and the maximum dischargeable electricity of a single stack during the normal period respectively: Among them, is the maximum discharge power of the th V2G charging pile during peak hours; is the maximum charge power of the th V2G charging pile during valley hours; is the maximum charge power of the th V2G charging pile during normal hours; is the maximum discharge power of the th V2G charging pile during normal hours; is the number of charge and discharge modules of the th V2G charging pile; is the maximum discharge power of the charge and discharge modules of the th V2G charging pile; is the maximum charge power of the charge and discharge modules of the th V2G charging pile; is the number of the V2G charging pile; S8. Respectively sort the maximum chargeable power of each V2G charging pile during normal times and the maximum dischargeable power of each V2G charging pile during normal times from large to small to obtain a second numbered sorting vector and a third numbered sorting vector ; ; ; S9. Respectively according to the peak-time single-pile maximum discharge power of each V2G charging pile , the valley-time single-pile maximum charge power of each V2G charging pile and the sum of the battery capacities of the new energy vehicles connected to each V2G charging pile , obtain the total peak-time maximum discharge power , the total valley-time maximum charge power and the total sum of battery capacities ; S10. Determine the total maximum dischargeable power at peak times and the total maximum chargeable power at valley times and the total battery capacity to check if the minimum value among them is the total maximum dischargeable power at peak times . If so, according to the number of guns of each V2G charging pile , the third numbered sorting vector , the numbered sorting matrix , the first numbered sorting vector , the upper battery charge limit and the lower battery charge limit , execute the first strategy. Otherwise, according to the number of guns of each V2G charging pile , the numbered sorting matrix , the first numbered sorting vector , the second numbered sorting vector , the upper battery charge limit and the lower battery charge limit , execute the second strategy; The V2G charging pile is used to convert grid-side AC electrical energy into grid DC electrical energy and store it through the vehicle battery according to the charge and discharge control signal, or to convert the DC electrical energy of the vehicle battery into AC electrical energy for use by the new energy sales site according to the charge and discharge control signal.

2. The new energy store V2G system according to claim 1, characterized in that, The charging pile power distribution cabinet includes an EMS controller, a first two-way electricity meter, and a second two-way electricity meter; the EMS controller is connected to the first two-way electricity meter and the second two-way electricity meter; the EMS management platform is connected to the EMS controller through wireless communication; The EMS controller is used to obtain the charge and discharge control signal according to the control strategy; The first two-way electricity meter is connected to the second two-way electricity meter and each V2G charging pile through power cables, and the first two-way electricity meter is used to measure the electrical energy conditions of the new energy vehicles connected to the V2G charging pile; The second two-way electricity meter is connected to the regional main transformer through a power cable, and the second two-way electricity meter is used to measure the electrical energy conditions of the new energy sales site.

3. The new energy store V2G system according to claim 1, characterized in that, The V2G charging pile is respectively connected to several new energy electric vehicles through charging guns; The new energy electric vehicle is used to store grid electrical energy or release the electrical energy of the vehicle battery.

4. The new energy store V2G system according to claim 1, characterized in that, The specific content of the first strategy in step S10 is: A1. Determine the current time period. If it is the valley period , then each V2G charging pile, according to the number of guns of each V2G charging pile , the number sorting matrix and the upper limit of battery charge , uses the value of the maximum chargeable power of a single pile during valley hours as the charging amount of all V2G charging piles and charges according to the charging strategy; If it is the peak period , then each V2G charging pile, according to the number of guns of each V2G charging pile , number sorting matrix and the lower limit of battery charge , uses the value of the maximum dischargeable power of a single pile during peak hours as the discharge amount of all V2G charging piles and discharges according to the discharge strategy; If it is the normal period , then go to step A2; A2. Calculate the discharge amount during normal periods : Among them, is the discharge capacity during normal periods; is the formula selection symbol identifier. When , it means that the battery capacity and total amount are less than or equal to the total maximum rechargeable capacity during valley periods . When , it means that the battery capacity and total amount are greater than the total maximum rechargeable capacity during valley periods ; A3. Sort according to the third numbered sorting vector , with the first numbered sorting vector as the secondary order to obtain a set of discharge stacks; the set of discharge stacks is the first n stacks in the third numbered sorting vector n , and the set of discharge stacks is the minimum set that satisfies the sum of the maximum discharge power of each single stack during normal times of stacks is not less than the discharge amount during normal periods; A4. Calculate the discharge amount of each V2G charging stack according to the discharge stack set : Among them, is the discharge amount of the th V2G charging stack; is the sum of the discharge amounts of the V2G charging stacks with the serial numbers in the third numbered sorting vector ; is the discharge amount of the V2G charging stack with the serial number in the third numbered sorting vector ; is the serial number of the V2G charging stack in the third numbered sorting vector . A5. According to the number of guns of each V2G charging pile , the numbering sorting matrix and the lower limit of battery charge , each V2G charging pile discharges each new energy electric vehicle according to the discharge strategy and the discharge amount of each V2G charging pile .

5. The new energy store V2G system according to claim 4, wherein The specific content of the charging strategy in step A1 is: B1. According to the number of guns of each V2G charging pile , obtain the number of unactivated charging guns connected to the V2G charging pile; B2. Judge whether the number of unused charging guns in the V2G charging pile is 0. If so, go to step B4; otherwise, go to step B3; B3. Sort the matrix according to the number Start the charging guns in sequence according to the number of unactivated charging guns, and then judge in sequence whether the battery charge of each new energy electric vehicle connected to the V2G charging stack has reached the upper limit If so, stop charging for this new energy electric vehicle; otherwise, proceed to step B4 B4. Read the cumulative charging amount of the charging gun in the V2G charging pile ; B5. Determine the cumulative charging amount of the charging gun Whether it reaches the charging amount of this V2G charging pile If so, end the charging; otherwise, return to step B2.

6. The new energy store V2G system according to claim 4, characterized in that The specific content of the discharge strategy in step A1 or A5 is: C1. According to the number of guns of each V2G charging pile , obtain the number of unactivated charging guns connected to the V2G charging pile; C2. Judge whether the number of unused charging guns in the V2G charging pile is 0. If so, go to step C4; otherwise, go to step C3; C3. Sort the matrix according to the numbers Start the charging guns in sequence according to the number of unactivated charging guns, and then determine in sequence whether the battery charge of each new energy electric vehicle connected to the V2G charging pile has reached the lower limit of the battery charge If so, the new energy electric vehicle stops discharging; otherwise, proceed to step C4 C4. Read the cumulative discharge amount of the charging gun in the V2G charging pile ; C5. Determine the cumulative discharge amount of the charging gun Whether it has reached the discharge amount of this V2G charging pile , if so, end the discharge; otherwise, return to step C2.

7. The new energy store V2G system according to claim 1, characterized in that, The specific content of the second strategy in step S10 is: D1. Determine the current time period. If it is the valley period , then each V2G charging pile, according to the number of guns of each V2G charging pile , number sorting matrix and the upper limit of battery charge , uses the value of the maximum chargeable power of a single pile during valley hours as the charging amount of all V2G charging piles and charges according to the charging strategy; If it is the peak period , then each V2G charging pile, according to the number of guns of each V2G charging pile , the number sorting matrix and the lower limit of battery charge , takes the value of the maximum dischargeable power of a single pile during peak hours as the discharge amount of all V2G charging piles, and discharges according to the discharge strategy; If it is the normal period , then go to step B2; D2. Calculate the charging amount during normal periods :[[]]END]] Among them, is the charging amount during normal periods; is the formula selection symbol identifier. When , it represents the minimum value among the battery capacity and total amount , the total maximum dischargeable power during peak hours , the total maximum chargeable power during valley hours , and the battery capacity and total amount . When , it represents the total maximum chargeable power during valley hours is the total maximum dischargeable power during peak hours , the total maximum chargeable power during valley hours , and the battery capacity and total amount . And the total maximum dischargeable power during peak hours is not less than the battery capacity and total amount . When , it represents the total maximum chargeable power during valley hours is the total maximum dischargeable power during peak hours , the total maximum chargeable power during valley hours , and the battery capacity and total amount . And the total maximum dischargeable power during peak hours is less than the battery capacity and total amount ; is the minimum value function; is the sum of the remaining available battery capacities of each new energy electric vehicle connected to all V2G charging piles, is the remaining available battery capacity of the th vehicle connected to the th V2G charging pile, is the new energy electric vehicle number; D3. Sort according to the second numbered sorting vector , using the first numbered sorting vector as the secondary order to obtain a charging pile set; the charging pile set is the first m piles in the second numbered sorting vector , and the charging pile set is the minimum set that satisfies the sum of the maximum rechargeable power of each pile in the m piles not less than the charging amount during normal periods ; ​ D4. Calculate the charging amount of each V2G charging pile according to the charging pile set : Among them, is the charging amount of the th V2G charging stack; is the sum of the charging amounts of the V2G charging stacks with the sequence numbers in the second numbered sorting vector ; is the charging amount of the V2G charging stack with the sequence number in the second numbered sorting vector ; is the sequence number of the V2G charging stack in the second numbered sorting vector . D5. According to the number of charging guns of each V2G charging pile , the number sorting matrix and the lower limit of battery charge , each V2G charging pile charges each new energy electric vehicle according to the charging strategy and the charging amount of each V2G charging pile .

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