Anti-reflux system

Abstract

The invention provides an anti-backflow system, and the system comprises a storage and charging integrated cabin which is used for storing electric energy; the storage and charging integrated cabin comprises a charging pile, an energy storage module, an intermediate relay and a switch which are electrically connected; the control module is configured to obtain static data and dynamic data; determining the output power of the energy storage module and the charging pile based on the static data and the dynamic data; acquiring power supply data; and based on the power supply data, adjusting the power supply condition among the energy storage module, the charging pile and the commercial power, and determining the opening or closing of a first switch node, a second switch node, a third switch node, a fourth switch node, a fifth switch node and an anti-countercurrent contactor, so as to solve the problems that the utilization rate of distributed energy is greatly reduced due to a current anti-countercurrent control scheme; and equipment loss is accelerated, the service life of equipment is shortened, and the operation and maintenance cost is increased.

Description

Technical Field

[0001] This application relates to the field of power grid equipment technology, and in particular to an anti-backflow system. Background Technology

[0002] With the rapid development of renewable energy power generation technologies, the large-scale grid connection of distributed photovoltaic systems, energy storage systems, and electric vehicle charging facilities poses a severe challenge to the stable operation of the distribution network. Among these challenges, backflow prevention control is a core requirement for ensuring grid security. When the discharge of distributed energy sources (such as energy storage) exceeds local load demand, excess electricity may flow back into the upstream grid through the grid connection point, causing problems such as grid voltage fluctuations, frequency deviations, and equipment overloads, and even triggering malfunctions of grid protection devices or electrical fire risks. Furthermore, some regions explicitly prohibit backflow of electricity due to policy restrictions or transformer capacity saturation, further enhancing the necessity of backflow prevention technology.

[0003] To address the aforementioned issues, several anti-backflow control schemes have been proposed: One is a direct disconnection control scheme, which installs anti-backflow protection devices at the grid connection point to monitor power direction in real time. Once backflow is detected, the grid connection switch is immediately disconnected, thereby preventing excess power from flowing back into the upstream grid. Another is a price-incentive-based dynamic adjustment scheme. This scheme constructs a price model and dynamically adjusts user electricity prices according to different time periods, guiding users to adjust their electricity demand to match their power generation as closely as possible, thus reducing the occurrence of backflow.

[0004] However, while direct disconnection control schemes can quickly and effectively block backflow, they lead to a significant decrease in the utilization rate of distributed energy resources. Frequent switching operations also accelerate equipment wear and tear, shorten equipment lifespan, and increase maintenance costs. Electricity price incentive-based dynamic adjustment schemes, on the other hand, rely excessively on user behavior responses, have long adjustment cycles, and struggle to quickly respond to sudden load changes such as electric vehicle charging in integrated energy storage and charging systems. Furthermore, this scheme requires the construction of complex data prediction models, resulting in high implementation costs and making its widespread adoption in practical applications difficult. Summary of the Invention

[0005] This application provides an anti-backflow system to solve the technical problems that existing anti-backflow control schemes lead to a significant decrease in the utilization rate of distributed energy, accelerate equipment wear and tear, shorten equipment lifespan, and increase operation and maintenance costs.

[0006] This application provides an anti-backflow system, comprising: An integrated energy storage and charging compartment is connected to the mains power circuit; the integrated energy storage and charging compartment is used to store electrical energy. The integrated storage and charging compartment includes: The system includes an electrically connected charging pile, an energy storage module, an intermediate relay, and a switch. The charging pile and the energy storage module are connected to the mains power circuit via a main circuit. An anti-reverse current contactor is installed on the main circuit, positioned near the charging pile and the energy storage module. A first branch is established between the anti-reverse current contactor and the energy storage module, and the intermediate relay is located on this first branch. A first switching node is also installed on the main circuit, positioned near the mains power circuit. A second branch is established between the first switching node and the charging pile and the energy storage module, and the switch is located on this second branch. The energy storage module includes: a first energy storage unit, a second energy storage unit, and a third energy storage main control unit; the charging pile is connected to the main circuit through a second switching node; the first energy storage unit is connected to the main circuit through a third switching node; the second energy storage unit is connected to the main circuit through a fourth switching node; and the third energy storage main control unit is connected to the main circuit through a fifth switching node. The control module is configured to: Acquire static and dynamic data; the static data includes: the rated power and upper limit of the operating power of the transformer between the integrated energy storage and charging compartment and the mains power circuit, the rated power of the charging pile, the rated power of the energy storage module, and the peak and off-peak electricity consumption periods in the area where the integrated energy storage and charging compartment is located; the dynamic data includes: the remaining power on the busbar where the integrated energy storage and charging compartment is located, the remaining capacity of the energy storage module, and the required power and actual power of the charging pile. Based on the static and dynamic data, the output power of the energy storage module and the charging pile is determined; Acquire power supply data; the power supply data includes: the voltage and power values ​​of the energy storage module, the power value of the charging pile, and the mains power value; Based on the power supply data, the power supply status between the energy storage module, the charging pile, and the mains power is adjusted, and the opening or closing of the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor is determined.

[0007] In some embodiments, the step of determining the output power of the energy storage module and the charging pile based on the static data and dynamic data includes: If the remaining power is greater than 0, the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile is greater than or equal to 0, then the charging pile enters the charging state, and the energy storage module enters the discharging state; the discharging output power of the energy storage module is: P strdisout =P chrreq -Pchrreal -P busrem ; In the formula, P strdisout P is the discharge output power of the energy storage module; chrreq P represents the required power of the charging pile. chrreal P represents the actual power of the charging pile; busrem The remaining power on the busbar where the integrated storage and charging compartment is located; If the discharge output power of the energy storage module is greater than the rated power of the energy storage module, then the output power of the charging pile and the output power of the energy storage module are determined according to the set rules; the output power of the charging pile is: P chrout = P strrate + P busrem The discharge output power of the energy storage module is: P strdisout = P strrate ; In the formula, P strrate The rated power of the energy storage module; If the discharge output power of the energy storage module is less than or equal to the rated power of the energy storage module, then the output power of the charging pile is: P chrout =P chrreq The discharge output power of the energy storage module is: P strdisout = P chrreq -P chrreal -P busrem ; In the formula, P chrout The output power of the charging pile.

[0008] In some embodiments, the step of determining the output power of the energy storage module and the charging pile based on the static data and dynamic data includes: If the remaining power is greater than 0, the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile is less than 0, then the energy storage module and the charging pile enter the charging state; the charging output power of the energy storage module is: P strchrout = P busrem ; In the formula, P strchrout The charging output power of the energy storage module; If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the required power and the actual power of the charging pile is greater than or equal to 0, then the charging pile enters the charging state; and the output power of the charging pile and the output power of the energy storage module are determined according to the set rules. If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the power demanded by the charging pile and the actual power is less than 0, then the charging pile enters the charging state, and the output power of the energy storage module is 0. If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the required power and the actual power of the charging pile is greater than or equal to 0, then the charging pile enters the charging state, and the energy storage module enters the standby state; the output power of the charging pile is: P chrout = P chrreal +P busrem The output power of the energy storage module is 0. If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the required power and the actual power of the charging pile is less than the remaining power on the busbar where the integrated energy storage and charging module is located, then the charging pile enters the charging state; and the output power of the charging pile and the output power of the energy storage module are determined according to the set rules.

[0009] In some embodiments, the step of determining the output power of the energy storage module and the charging pile based on the static data and dynamic data includes: If the remaining power is less than or equal to 0, the actual power of the charging pile is 0, and the charging output power of the energy storage module is 0, then the output power of the energy storage module is 0. If the remaining power is less than or equal to 0, and the sum of the actual power of the charging pile and the charging output power of the integrated storage and charging compartment is greater than the absolute value of the remaining power on the bus where the integrated storage and charging compartment is located, then the charging output power of the integrated storage and charging compartment is reduced to 0. If the remaining power is less than or equal to 0, and the charging output power of the energy storage module is equal to the absolute value of the remaining power on the busbar where the integrated energy storage and charging module is located, then the output power of the charging pile is: P chrout = P chrout The output power of the energy storage module is 0. If the remaining power is less than or equal to 0, and the charging output power of the energy storage module is greater than the absolute value of the remaining power on the busbar where the integrated energy storage and charging compartment is located, then the discharging output power of the energy storage module is: P strdisout =P strchrout -abs(P busrem ); In the formula, abs(P) busrem ) represents the absolute value of the remaining power on the busbar where the integrated storage and charging compartment is located; If the discharge output power of the energy storage module is less than or equal to the rated power of the energy storage module, then the output power of the charging pile is: P chrout = P chroutThe discharge output power of the energy storage module is: P strdisout =P strchrout -abs(P busrem ); If the discharge output power of the energy storage module is greater than the rated power of the energy storage module, then the output power of the charging pile is: P chrout = P strrate +abs(P busrem The discharge output power of the energy storage module is: P strdisout =P strrate .

[0010] In some embodiments, the step of adjusting the power supply status between the energy storage module, the charging pile, and the mains power based on the power supply data includes: When both the energy storage module and the charging pile are simultaneously powered by mains electricity: The charging stack is given priority in power supply; if the voltage value of the energy storage module is greater than the charging cut-off voltage value of the energy storage module, the mains power supply to the energy storage module is stopped. If the voltage value of the energy storage module is less than the discharge cutoff voltage value of the energy storage module, then the energy storage module stops supplying power to the charging pile. If the power value of the charging pile is less than the mains power value and the voltage value of the energy storage module is less than the charging cut-off voltage value of the energy storage module, then the mains power supplies the charging pile, and if there is any remaining power, it supplies the energy storage module, until the voltage value of the energy storage module is greater than or equal to the charging cut-off voltage value of the energy storage module, at which point the mains power stops supplying the energy storage module. If the power value of the charging pile is less than the mains power value and the voltage value of the energy storage module is greater than the charging cutoff voltage value of the energy storage module, then the mains power is supplied to the charging pile and the power supply to the energy storage module is stopped. If the power value of the charging pile is equal to the mains power value, then the mains power is supplied to the charging pile.

[0011] In some embodiments, after the step of simultaneously supplying power to the energy storage module and the charging pile using mains power, the following is included: During peak and off-peak electricity hours in the area where the integrated energy storage and charging module is located, if the mains power is less than the power of the charging pile and the power of the charging pile is less than or equal to the sum of the power of the charging pile and the mains power, then the energy storage module and the mains power supply the charging pile simultaneously until the voltage of the energy storage module is less than or equal to the discharge cutoff voltage of the energy storage module. At this point, the energy storage module stops supplying power to the charging pile and reduces the output power of the charging pile until the power of the charging pile is less than or equal to the mains power. During peak and off-peak electricity hours in the area where the integrated energy storage and charging module is located, if the power value of the charging pile is greater than the sum of the power value of the energy storage module and the mains power value, the output power of the charging pile will be reduced until the power value of the charging pile is less than or equal to the sum of the power value of the energy storage module and the mains power value.

[0012] In some embodiments, the step of determining whether the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are open or closed includes: When the mains power supply is simultaneously supplied to the energy storage module and the charging pile, the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are closed; When the mains power supply is supplied to the energy storage module, the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are closed.

[0013] In some embodiments, the step of adjusting the power supply status between the energy storage module, the charging pile, and the mains power based on the power supply data includes: When the energy storage module is used to power the charging pile: If the charging pile is not in use, the mains power is supplied to the energy storage module; When the mains power supply is supplied to the charging pile, if the remaining capacity is greater than or equal to 10% when the mains power is overloaded, the energy storage module supplies power to the charging pile; if the remaining capacity is less than 10%, the output power value of the charging pile is reduced until it is less than or equal to the mains power value. If the power value of the charging pile is less than the mains power value and the voltage value of the energy storage module is less than the charging cut-off voltage value of the energy storage module, then the mains power supplies the charging pile, and if there is any remaining power, it supplies the energy storage module, until the voltage value of the energy storage module is greater than or equal to the charging cut-off voltage value of the energy storage module, at which point the mains power stops supplying the energy storage module. If the power value of the charging pile is less than the mains power value and the voltage value of the energy storage module is greater than the charging cutoff voltage value of the energy storage module, then the mains power is supplied to the charging pile and the power supply to the energy storage module is stopped. If the mains power value is less than the power value of the charging pile and the power value of the charging pile is less than the sum of the power value of the energy storage module and the mains power value, and the voltage value of the energy storage module is greater than the discharge cutoff voltage of the energy storage module, then the energy storage module and the mains power supply the charging pile simultaneously. If the mains power value is less than the power value of the charging pile and the power value of the charging pile is equal to the sum of the power value of the energy storage module and the mains power value, and the voltage value of the energy storage module is greater than the discharge cutoff voltage of the energy storage module, then the energy storage module and the mains power supply simultaneously to the charging pile.

[0014] In some embodiments, after the step of supplying power to the charging pile using the energy storage module, the following is included: If the mains power value is less than the power value of the charging pile and the power value of the charging pile is less than or equal to the sum of the power value of the energy storage module and the mains power value, then the energy storage module and the mains power supply the charging pile simultaneously; when the voltage value of the energy storage module is less than or equal to the discharge cutoff voltage of the energy storage module, the energy storage module stops supplying power to the charging pile and reduces the output power of the charging pile until the power value of the charging pile is less than or equal to the mains power value. If the power value of the charging pile is greater than the sum of the power value of the energy storage module and the mains power value, the output power of the charging pile is reduced until the power value of the charging pile is less than or equal to the sum of the power value of the energy storage module and the mains power value; when the voltage value of the energy storage module is less than or equal to the discharge cutoff voltage of the energy storage module, the output power of the charging pile is reduced until the power value of the charging pile is less than or equal to the mains power value.

[0015] In some embodiments, the step of determining whether the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are open or closed includes: When the energy storage module and the mains power supply are supplied to the charging pile, the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are closed; When the energy storage module supplies power to the charging pile, the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor are closed.

[0016] This application provides an anti-backflow system, comprising: an integrated charging and storage compartment connected to the mains power circuit; the integrated charging and storage compartment for storing electrical energy; the integrated charging and storage compartment including: a charging pile, an energy storage module, an intermediate relay, and a switch, all electrically connected; the charging pile and the energy storage module are connected to the mains power circuit via a main circuit; an anti-backflow contactor is provided on the main circuit, the anti-backflow contactor being located near the charging pile and the energy storage module; a first branch is provided between the anti-backflow contactor and the energy storage module, and the intermediate relay is located on the first branch; the main circuit... The system also includes a first switching node, located on the side closest to the mains power circuit; a second branch is established between the first switching node and the charging pile and energy storage module, and the switch is located on the second branch; the energy storage module includes: a first energy storage unit, a second energy storage unit, and a third energy storage main control unit; the charging pile is connected to the main circuit via the second switching node; the first energy storage unit is connected to the main circuit via the third switching node; the second energy storage unit is connected to the main circuit via the fourth switching node; and the third energy storage main control unit is connected to the main circuit via the fifth switching node. Main circuit connection; control module, configured to: acquire static data and dynamic data; the static data includes: the rated power and upper limit of the operating power of the transformer between the integrated energy storage and charging compartment and the mains power circuit, the rated power of the charging pile, the rated power of the energy storage module, and the peak and off-peak electricity consumption periods in the area where the integrated energy storage and charging compartment is located; the dynamic data includes: the remaining power on the busbar where the integrated energy storage and charging compartment is located, the remaining capacity of the energy storage module, the required power and actual power of the charging pile; based on the static data and dynamic data, determine the energy storage module and the charging pile... Output power; acquire power supply data; the power supply data includes: the voltage and power values ​​of the energy storage module, the power value of the charging pile, and the mains power value; based on the power supply data, adjust the power supply status between the energy storage module, the charging pile, and the mains power, and determine the opening or closing of the first switch node, the second switch node, the third switch node, the fourth switch node, the fifth switch node, and the anti-reverse current contactor, so as to realize the integrated energy storage and charging compartment and the mains power grid operation, while the power supply can be cut off to realize the whole compartment anti-reverse current function of the integrated energy storage and charging compartment, which reduces operating costs and improves the stability and operational reliability of the system. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the anti-backflow system in this application; Figure 2 This is the first schematic diagram of the energy flow in the integrated storage and charging chamber of this application; Figure 3 This is a second schematic diagram of the energy flow in the integrated storage and charging chamber of this application; Figure 4 This is the third schematic diagram of the energy flow in the integrated storage and charging chamber of this application; Figure 5 This is the fourth schematic diagram of the energy flow in the integrated storage and charging chamber of this application.

[0019] Explanation of reference numerals in the attached figures: 1-Integrated energy storage and charging compartment; 11-Charging stack; 111-Second switching node; 12-Energy storage module; 121-First energy storage unit; 1211-Third switching node; 122-Second energy storage unit; 1221-Fourth switching node; 123-Third energy storage main control unit; 1231-Fifth switching node; 13-Intermediate relay; 14-Switch; 15-Anti-reverse current contactor; 16-First switching node. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0021] In some technologies, anti-reverse flow control schemes can lead to a significant decrease in the utilization rate of distributed energy, accelerate equipment wear and tear, shorten equipment lifespan, and increase operation and maintenance costs. To address this technical problem, this application provides an anti-reverse flow system to prevent the integrated energy storage and charging module 1 from feeding back (reverse flow) to the power grid (mains power), ensuring that electrical energy flows only from the power grid to the load (charging pile 11) or from the energy storage module 12 to the load. The structure of each part of the anti-reverse flow system is described below: like Figure 1 The diagram shown is a schematic diagram of the anti-backflow system in this application.

[0022] This application provides an anti-backflow system, comprising: The integrated energy storage and charging compartment 1 is connected to the circuit where the mains power is located; the integrated energy storage and charging compartment 1 is used to store electrical energy.

[0023] The integrated storage and charging compartment 1 includes: The circuit includes an electrically connected charging pile 11, an energy storage module 12, an intermediate relay 13, and a switch 14. The charging pile 11 and the energy storage module 12 are connected to the mains power circuit via a main circuit. An anti-reverse current contactor 15 is installed on the main circuit, positioned near the charging pile 11 and the energy storage module 12. A first branch is established between the anti-reverse current contactor 15 and the energy storage module 12, and the intermediate relay 13 is located on this first branch. A first switching node 16 is also installed on the main circuit, positioned near the mains power circuit. A second branch is established between the first switching node 16 and the charging pile 11 and the energy storage module 12, and the switch 14 is located on this second branch. Figure 1 As shown.

[0024] The energy storage module 12 includes: a first energy storage unit 121, a second energy storage unit 122, and a third energy storage main control unit 123; the charging pile 11 is connected to the main circuit through a second switching node 111; the first energy storage unit 121 is connected to the main circuit through a third switching node 1211; the second energy storage unit 122 is connected to the main circuit through a fourth switching node 1221; and the third energy storage main control unit 123 is connected to the main circuit through a fifth switching node 1231.

[0025] For example, such as Figure 1 As shown, an anti-reverse current meter (including a CT sensor) is installed at the grid connection point (PCC2) to monitor the current direction in real time. If power is detected flowing back to the grid (reverse current), the protection action is triggered through the control module. The energy storage module 12 dynamically adjusts its charging and discharging power according to the load demand, ensuring that the energy storage module 12 only discharges when the load power demand is greater than the grid power. When the load power demand decreases, the energy storage module 12 automatically reduces its output power to avoid reverse current.

[0026] Specifically, the energy storage module 12 adjusts its output power to ensure that the energy storage output power is ≤ (load demand - grid supply). If the reverse current continues for more than a set time (e.g., 2 seconds), the power of the energy storage module 12 is adjusted to 0, and the anti-reverse current contactor 15 is disconnected. Reverse power is not allowed at PCC2. A load measuring meter is added to the main circuit PCC2, and the third energy storage main control unit 123 monitors the load power in real time and controls the output power of the energy storage module 12 to match the load demand, ensuring that the system does not experience reverse current to the grid. At the same time, an anti-reverse current contactor 15 (i.e., KM1) is added to the main circuit. If reverse current is detected within 2 seconds, the anti-reverse current contactor 15 is triggered to disconnect the grid within 100ms to prevent power supply to the grid. Meanwhile, the energy storage module 12 enters a shutdown mode based on the anti-islanding function and does not output power externally. After the grid is restored, the anti-reverse current contactor 15 closes, and the energy storage module 12 reconnects to the system after detecting phase synchronization with the grid.

[0027] The control module is configured to: Acquire static and dynamic data; the static data includes: the rated power P of the transformer between the integrated storage and charging compartment 1 and the mains power circuit. trsrate and the upper limit of operating power P upmax The rated power P of the charging pile 11 chrrate The rated power P of the energy storage module 12 strrate The peak and off-peak electricity consumption periods in the area where the integrated storage and charging compartment 1 is located.

[0028] The dynamic data includes: the remaining power P on the busbar where the integrated storage and charging tank 1 is located. busrem (This is determined by collecting the voltage of the busbar); whereby a positive remaining power of the busbar indicates that the busbar still has remaining power; a negative remaining power of the busbar indicates that the busbar is already in a power over-limit state. The remaining capacity SOC of the energy storage module 12 and the required power P of the charging pile 11 are also considered. chrreqAnd the actual power. The required power is not the power demanded by the onboard BMS, but rather the "required power" calculated by the TCU based on changes in charging operations. When a new electric vehicle enters the pre-charging stage (i.e., a new electric vehicle connects to the charging pile 11 and starts charging via card swiping / scanning, etc., through the TCU, the TCU can determine that charging is about to begin); when a new electric vehicle enters the stage of nearing the end of charging (i.e., an electric vehicle that is already charging is about to finish charging, such as when the charging pile 11 enters the final stage of "trickle charging," or stops charging via card swiping / App, etc., through the TCU, the TCU can determine that charging is about to end). When the power value is an integer, it represents discharging (i.e., providing electrical energy as a power source); when the power value is 0, it represents standby (neither charging nor discharging); when the power value is negative, it represents charging (i.e., consuming electrical energy as a load).

[0029] If the required power is greater than the actual power, it means that the charging pile 11 needs to start a new charging cycle; if the required power is less than the actual power, it means that the charging pile 11 needs to terminate a charging cycle; if the required power is equal to the actual power, it means that the charging pile 11 is charging normally.

[0030] In principle, transformers are not allowed to operate under overload conditions, meaning that the real-time power of a transformer is not allowed to exceed its rated power. In actual operation, however, the power must be flexibly configured according to the specific requirements of the project. For example, it is not allowed to exceed 80% of the transformer's rated power (adjustable), or it is not allowed to exceed a certain fixed power value (the specific power value will be specified by the project).

[0031] When the energy storage module 12 is charging, the SOC is not allowed to exceed the upper limit (the upper limit of SOC is configurable and is not necessarily 100%, depending on the project requirements). When discharging, the SOC is not allowed to exceed the lower limit (the lower limit of SOC is configurable and is not necessarily 0%, depending on the project requirements). Under no circumstances is reverse current allowed, that is, the energy storage module 12 cannot discharge to the grid. In other words, the discharge power of the energy storage module 12 is not allowed to exceed the actual charging power of the charging pile 11, ensuring that the power generation of the energy storage module 12 will not use loads other than charging.

[0032] Based on the static and dynamic data, the output power of the energy storage module 12 and the charging pile 11 is determined.

[0033] Specifically, the step of determining the output power of the energy storage module 12 and the charging pile 11 based on the static and dynamic data includes the following sub-steps: If the remaining power is greater than 0 (i.e., there is still remaining power on the current bus), the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile 11 is greater than or equal to 0 (i.e., the charging pile 11 is about to enter a higher power charging state and the remaining power on the bus is insufficient), then the charging pile 11 enters the charging state, and the energy storage module 12 enters the discharging state; the discharging output power of the energy storage module 12 is: P strdisout =P chrreq -P chrreal -P busrem ; In the formula, P strdisout P is the discharge output power of the energy storage module 12; chrreq The required power of the charging pile 11; P chrreal P represents the actual power of the charging pile 11; busrem This refers to the remaining power on the busbar where the integrated storage and charging compartment 1 is located.

[0034] If the discharge output power of the energy storage module 12 is greater than the rated power of the energy storage module 12, then the output power of the charging pile 11 and the output power of the energy storage module 12 are determined according to the set rules; the output power of the charging pile 11 is: P chrout = P strrate + P busrem The discharge output power of the energy storage module 12 is: P strdisout = P strrate ; In the formula, P strrate The rated power of the energy storage module 12; If the discharge output power of the energy storage module 12 is less than or equal to the rated power of the energy storage module 12, then the output power of the charging pile 11 is: P chrout =P chrreq The discharge output power of the energy storage module 12 is: P strdisout =P chrreq -P chrreal -P busrem ; In the formula, P chrout The output power of the charging pile 11.

[0035] If the remaining power is greater than 0, the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile 11 is less than 0 (i.e., the charging pile 11 is about to enter a lower power charging state (meaning there will be more remaining power on the bus)), then the energy storage module 12 and the charging pile 11 enter the charging state; the charging output power of the energy storage module 12 is: Pstrchrout = P busrem (The energy storage module 12 first uses up the current available power of the bus. In the next cycle, the power of the charging pile 11 decreases, and then according to P...) busrem Adjust the charging power P of the energy storage module 12 strchrout ); In the formula, P strchrout This refers to the charging output power of the energy storage module 12.

[0036] If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the required power and the actual power of the charging pile 11 is greater than or equal to 0 (i.e., the charging pile 11 is about to enter a charging state with higher power), then the charging pile 11 enters the charging state; and the output power of the charging pile 11 and the output power of the energy storage module 12 are determined according to the set rules.

[0037] If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the required power and the actual power of the charging pile 11 is less than 0 (i.e., the charging pile 11 is about to enter a charging state with lower power), then the charging pile 11 enters the charging state, and the output power of the energy storage module 12 is 0.

[0038] If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the power demand and actual power of the charging pile 11 is greater than or equal to 0 (i.e., the charging pile 11 is about to enter a higher power charging state, and the current energy storage module 12 cannot provide power, so the power of the charging pile 11 must be limited), then the charging pile 11 enters the charging state, and the energy storage module 12 enters the standby state; the output power of the charging pile 11 is: P chrout = P chrreal +P busrem (Charging stack 11 operates with limited power); the output power of the energy storage module 12 is 0 (energy storage module 12 is in standby mode).

[0039] If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the required power and the actual power of the charging pile 11 is less than the remaining power on the busbar where the integrated energy storage and charging compartment 1 is located (i.e., the charging pile 11 is about to enter a charging state with lower power, which means that there will be more remaining power on the busbar), then the charging pile 11 enters the charging state; and the output power of the charging pile 11 and the output power of the energy storage module 12 are determined according to the set rules.

[0040] If the remaining power is less than or equal to 0 (i.e., there is no remaining power on the current bus), the actual power of the charging pile 11 is 0, and the charging output power of the energy storage module 12 is 0, then the output power of the energy storage module 12 is 0. The entire energy storage module 12 is in standby mode. Therefore, the current insufficient power on the bus is not caused by the energy storage module 12, and the integrated charging and energy storage compartment 1 is prohibited from operating. Starting the charging pile 11 or the energy storage module 12 will have a greater impact on the bus. If the energy storage module 12 is started discharging first, and then the charging pile 11 is started charging, then during the interval, there will definitely be a backflow (the electrical energy released by the energy storage module 12 before the charging pile 11 is started will be fed back to the bus). In this case, the integrated charging and energy storage compartment 1 will no longer operate.

[0041] If the remaining power is less than or equal to 0, and the sum of the actual power of the charging pile 11 and the charging output power of the integrated charging and storage tank 1 is greater than the absolute value of the remaining power on the bus where the integrated charging and storage tank 1 is located (the current insufficient power of the bus is caused by the integrated charging and storage tank 1), then the charging output power of the integrated charging and storage tank 1 is reduced to 0. In this case, P does not exist. strchrout <abs(P busrem In the case of adjusting P, strchrout During this period, if P appears strchrout <abs(P busrem ), then P strchrout It should not be adjusted to 0.

[0042] If the remaining power is less than or equal to 0, and the charging output power of the energy storage module 12 is equal to the absolute value of the remaining power on the busbar where the integrated energy storage and charging chamber 1 is located (i.e., when the charging power of the energy storage module 12 is 0, the charging power of the charging pile 11 is exactly the same as the busbar power), then the output power of the charging pile 11 is: P chrout = P chrout (The power of the charging pile 11 does not need to be adjusted); the output power of the energy storage module 12 is 0 (energy storage module 12 is in standby mode).

[0043] If the remaining power is less than or equal to 0, and the charging output power of the energy storage module 12 is greater than the absolute value of the remaining power on the busbar where the integrated energy storage and charging chamber 1 is located (i.e., when the charging power of the energy storage module 12 is 0, the charging power of the charging pile 11 is still greater than the busbar power), the discharging output power of the energy storage module 12 is: P strdisout =P strchrout -abs(P busrem ); In the formula, abs(P) busrem ) represents the absolute value of the remaining power on the busbar where the integrated storage and charging compartment 1 is located; If the discharge output power of the energy storage module 12 is less than or equal to the rated power of the energy storage module 12, then the output power of the charging pile 11 is: P chrout = P chrout (The power of the charging pile 11 does not need to be adjusted); the discharge output power of the energy storage module 12 is: P strdisout =P strchrout -abs(P busrem (The energy storage module 12 discharges according to the calculated value).

[0044] If the discharge output power of the energy storage module 12 is greater than the rated power of the energy storage module 12, then the output power of the charging pile 11 is: P chrout = P strrate +abs(P busrem (Charging stack 11 operates at limited power, and no further charging power is allowed); the discharge output power of the energy storage module 12 is: P strdisout = P strrate (Energy storage module 12 discharges at its rated power).

[0045] Acquire power supply data; the power supply data includes: the voltage and power values ​​of the energy storage module 12, the power value of the charging pile 11, and the mains power value.

[0046] Based on the power supply data, the power supply status between the energy storage module 12, the charging pile 11, and the mains power is adjusted, and the opening or closing of the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-reverse current contactor 15 is determined.

[0047] Specifically, the step of adjusting the power supply status between the energy storage module 12, the charging pile 11, and the mains power based on the power supply data includes the following sub-steps: When both the energy storage module 12 and the charging pile 11 are simultaneously powered by mains electricity: Power is preferentially supplied to the charging stack 11; if the voltage value of the energy storage module 12 is greater than the charging cut-off voltage value of the energy storage module 12 (the charging cut-off voltage of a single cell is 3.55V, and the charging cut-off voltage of the energy storage module 12 is 923V), then the mains power supply to the energy storage module 12 is stopped.

[0048] If the voltage of the energy storage module 12 is less than the discharge cutoff voltage of the energy storage module 12 (discharge cutoff voltage of a single cell is 2.8V, and discharge cutoff voltage of the energy storage module 12 is 728V), then the energy storage module 12 stops supplying power to the charging pile 11.

[0049] If the power value of the charging pile 11 is less than the mains power value and the voltage value of the energy storage module 12 is less than the charging cut-off voltage value of the energy storage module 12, then the mains power supplies the charging pile 11. If there is any remaining power, it supplies the energy storage module 12 until the voltage value of the energy storage module 12 is greater than or equal to the charging cut-off voltage value of the energy storage module 12, at which point the mains power stops supplying the energy storage module 12.

[0050] If the power value of the charging pile 11 is less than the mains power value and the voltage value of the energy storage module 12 is greater than the charging cut-off voltage value of the energy storage module 12, then the mains power is supplied to the charging pile 11 and the power supply to the energy storage module 12 is stopped.

[0051] If the power value of the charging pile 11 is equal to the mains power value, then the mains power is supplied to the charging pile 11.

[0052] During peak and off-peak hours in the area where the integrated energy storage and charging module 1 is located, if the mains power is less than the power of the charging pile 11 and the power of the charging pile 11 is less than or equal to the sum of the power of the charging pile 11 and the mains power, then the energy storage module 12 and the mains power supply the charging pile 11 simultaneously until the voltage of the energy storage module 12 is less than or equal to the discharge cutoff voltage of the energy storage module 12. At this point, the energy storage module 12 stops supplying power to the charging pile 11 and reduces the output power of the charging pile 11 or delays non-emergency charging tasks until the power of the charging pile 11 is less than or equal to the mains power.

[0053] During peak and off-peak hours in the area where the integrated energy storage and charging module 1 is located, if the power value of the charging pile 11 is greater than the sum of the power value of the energy storage module 12 and the mains power value, the output power of the charging pile 11 will be reduced or non-emergency charging tasks will be delayed until the power value of the charging pile 11 is less than or equal to the sum of the power value of the energy storage module 12 and the mains power value.

[0054] The step of determining whether the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-backflow contactor 15 are open or closed includes the following sub-steps: When the mains power supply simultaneously powers both the energy storage module 12 and the charging pile 11, the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-reverse current contactor 15 close, allowing energy to flow from the public grid transformer to the energy storage module 12 and the charging pile 11. Figure 2 As shown.

[0055] When the mains power supply is applied to the energy storage module 12, the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-reverse current contactor 15 are closed, and energy flows from the public grid transformer to the charging pile 11. The energy storage module 12 remains stationary. Figure 3 As shown.

[0056] The step of adjusting the power supply status between the energy storage module 12, the charging pile 11, and the mains power based on the power supply data includes the following sub-steps: When the energy storage module 12 supplies power to the charging stack 11: If the charging pile 11 is not in use, the mains power is supplied to the energy storage module 12.

[0057] When the mains power supply is supplied to the charging pile 11, if the mains power is overloaded and the remaining capacity is greater than or equal to 10%, the energy storage module 12 supplies power to the charging pile 11; if the remaining capacity is less than 10%, the output power value of the charging pile 11 is reduced until it is less than or equal to the mains power value, or non-emergency charging tasks are delayed.

[0058] If the power value of the charging pile 11 is less than the mains power value and the voltage value of the energy storage module 12 is less than the charging cut-off voltage value of the energy storage module 12, then the mains power supplies the charging pile 11. If there is any remaining power, it supplies the energy storage module 12 until the voltage value of the energy storage module 12 is greater than or equal to the charging cut-off voltage value of the energy storage module 12, at which point the mains power stops supplying the energy storage module 12.

[0059] If the power value of the charging pile 11 is less than the mains power value and the voltage value of the energy storage module 12 is greater than the charging cut-off voltage value of the energy storage module 12, then the mains power is supplied to the charging pile 11 and the power supply to the energy storage module 12 is stopped.

[0060] If the mains power value is less than the power value of the charging pile 11 and the power value of the charging pile 11 is less than the sum of the power value of the energy storage module 12 and the mains power value, and the voltage value of the energy storage module 12 is greater than the discharge cutoff voltage of the energy storage module 12, then the energy storage module 12 and the mains power supply simultaneously to the charging pile 11.

[0061] If the mains power value is less than the power value of the charging pile 11 and the power value of the charging pile 11 is equal to the sum of the power value of the energy storage module 12 and the mains power value, and the voltage value of the energy storage module 12 is greater than the discharge cutoff voltage of the energy storage module 12, then the energy storage module 12 and the mains power supply simultaneously to the charging pile 11.

[0062] If the mains power value is less than the power value of the charging pile 11 and the power value of the charging pile 11 is less than or equal to the sum of the power value of the energy storage module 12 and the mains power value, then the energy storage module 12 and the mains power supply the charging pile 11 simultaneously; when the voltage value of the energy storage module 12 is less than or equal to the discharge cutoff voltage of the energy storage module 12, the energy storage module 12 stops supplying power to the charging pile 11, and reduces the output power of the charging pile 11 or delays non-emergency charging tasks until the power value of the charging pile 11 is less than or equal to the mains power value.

[0063] If the power value of the charging pile 11 is greater than the sum of the power value of the energy storage module 12 and the mains power value, then the output power of the charging pile 11 is reduced or the non-emergency charging task is delayed until the power value of the charging pile 11 is less than or equal to the sum of the power value of the energy storage module 12 and the mains power value; when the voltage value of the energy storage module 12 is less than or equal to the discharge cutoff voltage of the energy storage module 12, the output power of the charging pile 11 is reduced until the power value of the charging pile 11 is less than or equal to the mains power value.

[0064] The step of determining whether the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-backflow contactor 15 are open or closed includes the following sub-steps: When the energy storage module 12 and the mains power supply are supplied to the charging pile 11, the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-reverse current contactor 15 are closed, and energy flows from the public grid transformer and the energy storage module 12 to the charging pile 11. Figure 4 As shown.

[0065] When the energy storage module 12 supplies power to the charging pile 11, the first switch node 16, the second switch node 111, the third switch node 1211, the fourth switch node 1221, the fifth switch node 1231, and the anti-reverse current contactor 15 are closed, and energy flows from the energy storage module 12 to the charging pile 11. Figure 5 As shown.

[0066] For example, if there are no anti-backflow measures during the charging process of an electric vehicle, when the mains power and energy storage power of the integrated storage and charging unit 1 exceed the charging power demand of the charging pile 11, it may cause current to flow back to the grid (mains power), i.e., current backflow phenomenon, which will interfere with the normal operation of the grid, affect the power balance and stability of the grid, and may even cause grid faults, such as voltage fluctuations and frequency abnormalities, thereby affecting the normal power consumption of other users.

[0067] If the integrated energy storage and charging module 1 continues to supply power to the grid during a power grid failure or outage, an islanding effect will occur. This islanding effect could lead to electric shock for grid maintenance personnel during repairs, endangering their personal safety, and could also damage grid equipment. The anti-reverse current device can detect the islanding phenomenon in a timely manner and quickly disconnect the grid connection switch, disconnecting the integrated energy storage and charging module 1 from the grid and ensuring the safety of equipment and personnel.

[0068] The anti-reverse current control of the integrated energy storage and charging module 1 can flexibly adjust the charging and discharging power of the energy storage module 12 according to the grid load, achieving peak shaving and valley filling effects. During peak grid load periods, the discharging power of the energy storage module 12 is increased to supply power to the charging pile 11, reducing the power supply pressure on the grid; during off-peak grid load periods, the charging power of the energy storage module 12 is increased to utilize off-peak electricity prices for charging, thereby improving the grid load factor and optimizing the operating efficiency of the power system.

[0069] This application provides an anti-reverse current system. The third energy storage main control unit 123, as the main energy controller of the integrated energy storage and charging compartment 1, dynamically adjusts the output power of the liquid-cooled supercharging terminal (energy storage module 12) by controlling the charging stack 11. It also dynamically adjusts the charging and discharging power of the energy storage module 12 according to the charging power required by the liquid-cooled supercharging terminal and the remaining available power of the grid. The third energy storage main control unit 123 outputs a DO signal (dry contact) to control the opening and closing of the anti-reverse current contactor 15 of the main incoming line of the integrated energy storage and charging compartment 1. QF1 remains normally closed. When a reverse current occurs or the public power grid fails, the integrated energy storage and charging compartment 1, based on the anti-islanding protection function, remotely controls the anti-reverse current contactor 15 to open based on the third energy storage main control unit 123. After the public power grid is restored, the bidirectional multi-function meter detects the grid voltage and transmits the signal to the third energy storage main control unit 123. The third energy storage main control unit 123 then controls the anti-reverse current contactor 15 to close, thereby enabling the integrated energy storage and charging compartment 1 to operate normally. This application provides dual protection against backflow in the integrated energy storage and charging module 1, and through the coordinated control of the multi-level energy storage modules 12, it ensures full utilization of grid energy by the integrated energy storage and charging module 1, prioritizing load charging and ensuring that the grid fully charges the energy storage modules 12. This achieves grid-connected operation without disconnecting the power supply, thus reducing operating costs and improving system stability and operational reliability.

[0070] This application provides an anti-backflow system based on dual anti-backflow protection technology; (1) First layer of protection: The energy storage module 12 dynamically adjusts the output power of the energy storage module 12 and the output power of the charging pile 11 through the third energy storage main control unit 123. At the same time, a load detection meter is added at the main circuit PCC1. The third energy storage main control unit 123 formulates the anti-reverse current threshold according to relevant strategies, collects meter data in real time, and performs data analysis and processing. The third energy storage main control unit 123 controls the energy storage module 12 to dynamically adjust the charging and discharging power according to the load demand power and the available mains power, ensuring that the energy storage module 12 does not flow back to the grid when discharging, and ensuring that the energy storage module 12 can only discharge when the load power demand is greater than the grid power supply. When the load power demand decreases, the energy storage module 12 automatically reduces the output power to avoid reverse current. That is, the third energy storage main control unit 123 monitors the mains power at PCC1 in real time. The third energy storage main control unit 123 coordinates and controls the charging pile 11 and the energy storage module 12 so that the output power of the energy storage module is ≤ the output power of the charging pile 11 – the mains output power, ensuring that the integrated storage and charging compartment 1 will not experience reverse current.

[0071] (2) Second layer of protection: When the grid power is insufficient (the load demand exceeds 80% of the grid power) (i.e., the mains power < the output power of the charging pile 11), the insufficient power is supplemented by the energy storage module 12. The tracking speed of the energy storage module 12 to the load is maintained at the level of hundreds of milliseconds. An anti-reverse current device (bidirectional multi-function meter and CT sensor) is installed at the grid connection point PCC2 to realize bidirectional power monitoring and monitor the power direction of PCC2 in real time. The main circuit adds an anti-reverse current contactor 15 and an intermediate relay 13. If reverse power (500W, duration exceeding 2 seconds (adjustable)) is detected flowing to the grid (reverse current), the protection action is triggered. Within 100ms, the anti-reverse current contactor 15 is triggered to disconnect from the grid to prevent power from being sent to the grid. The energy storage module 12 enters the shutdown mode based on the anti-islanding function and does not output externally, thus realizing the function of anti-reverse current protection. When the grid voltage is restored, the bidirectional meter at PCC2 detects the mains voltage and transmits the signal to the third energy storage main control unit 123. The third energy storage main control unit 123 outputs a DO signal (dry contact) to control the anti-reverse current contactor 15 to close. The energy storage module 12 is connected to the system after it is detected that it is in phase synchronization with the grid.

[0072] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A backflow prevention system, characterized in that, include: The integrated storage and charging compartment (1) is connected to the mains power circuit; The integrated storage and charging compartment (1) is used to store electrical energy; The integrated storage and charging compartment (1) includes: The circuit includes an electrically connected charging pile (11), an energy storage module (12), an intermediate relay (13), and a switch (14); the charging pile (11) and the energy storage module (12) are connected to the mains circuit via a main circuit; an anti-reverse current contactor (15) is provided on the main circuit, and the anti-reverse current contactor (15) is located on the side close to the charging pile (11) and the energy storage module (12); a first branch is provided between the anti-reverse current contactor (15) and the energy storage module (12), and the intermediate relay (13) is located on the first branch; a first switch node (16) is also provided on the main circuit, and the first switch node (16) is located on the side close to the mains circuit; a second branch is provided between the first switch node (16) and the charging pile (11) and the energy storage module (12), and the switch (14) is located on the second branch; The energy storage module (12) includes: a first energy storage unit (121), a second energy storage unit (122), and a third energy storage main control unit (123); the charging pile (11) is connected to the main circuit through a second switching node (111); the first energy storage unit (121) is connected to the main circuit through a third switching node (1211); the second energy storage unit (122) is connected to the main circuit through a fourth switching node (1221); and the third energy storage main control unit (123) is connected to the main circuit through a fifth switching node (1231). The control module is configured to: Acquire static and dynamic data; the static data includes: the rated power and upper limit of the operating power of the transformer between the integrated energy storage and charging compartment (1) and the mains power circuit, the rated power of the charging pile (11), the rated power of the energy storage module (12), and the peak and valley periods of electricity consumption in the area where the integrated energy storage and charging compartment (1) is located; the dynamic data includes: the remaining power on the busbar where the integrated energy storage and charging compartment (1) is located, the remaining capacity of the energy storage module (12), the required power and actual power of the charging pile (11); Based on the static and dynamic data, the output power of the energy storage module (12) and the charging pile (11) is determined; Obtain power supply data; the power supply data includes: the voltage and power values ​​of the energy storage module (12), the power value of the charging pile (11), and the mains power value; Based on the power supply data, adjust the power supply status between the charging pile (11), the energy storage module (12), and the mains power, and determine whether the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are open or closed.

2. The anti-backflow system according to claim 1, characterized in that, The step of determining the output power of the energy storage module (12) and the charging pile (11) based on the static and dynamic data includes: If the remaining power is greater than 0, the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile (11) is greater than or equal to 0, then the charging pile (11) enters the charging state, and the energy storage module (12) enters the discharging state; the discharging output power of the energy storage module (12) is: P strdisout =P chrreq -P chrreal -P busrem ; In the formula, P strdisout P is the discharge output power of the energy storage module (12); chrreq The required power of the charging pile (11); P chrreal The actual power of the charging pile (11); P busrem The remaining power on the busbar where the integrated storage and charging compartment (1) is located; If the discharge output power of the energy storage module (12) is greater than the rated power of the energy storage module (12), then the output power of the charging pile (11) and the output power of the energy storage module (12) are determined according to the set rules; the output power of the charging pile (11) is: P chrout = P strrate + P busrem The discharge output power of the energy storage module (12) is: P strdisout =P strrate ; In the formula, P strrate The rated power of the energy storage module (12); If the discharge output power of the energy storage module (12) is less than or equal to the rated power of the energy storage module (12), then the output power of the charging pile (11) is: P chrout =P chrreq The discharge output power of the energy storage module (12) is: P strdisout = P chrreq -P chrreal -P busrem ; In the formula, P chrout The output power of the charging pile (11).

3. The anti-backflow system according to claim 2, characterized in that, The step of determining the output power of the energy storage module (12) and the charging pile (11) based on the static and dynamic data includes: If the remaining power is greater than 0, the remaining capacity is greater than or equal to 10% and less than or equal to 90%, and the difference between the required power and the actual power of the charging pile (11) is less than 0, then the energy storage module (12) and the charging pile (11) enter the charging state; the charging output power of the energy storage module (12) is: P strchrout = P busrem ; In the formula, P strchrout The charging output power of the energy storage module (12); If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the required power and the actual power of the charging pile (11) is greater than or equal to 0, then the charging pile (11) enters the charging state; and the output power of the charging pile (11) and the output power of the energy storage module (12) are determined according to the set rules. If the remaining power is greater than 0, the remaining capacity is greater than 90%, and the difference between the required power and the actual power of the charging pile (11) is less than 0, then the charging pile (11) enters the charging state, and the output power of the energy storage module (12) is 0. If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the required power and the actual power of the charging pile (11) is greater than or equal to 0, then the charging pile (11) enters the charging state, and the energy storage module (12) enters the standby state; the output power of the charging pile (11) is: P chrout = P chrreal +P busrem The output power of the energy storage module (12) is 0. If the remaining power is greater than 0, the remaining capacity is less than 10%, and the difference between the required power and the actual power of the charging pile (11) is less than the remaining power on the busbar where the integrated storage and charging compartment (1) is located, then the charging pile (11) enters the charging state; and the output power of the charging pile (11) and the output power of the energy storage module (12) are determined according to the set rules.

4. The anti-backflow system according to claim 3, characterized in that, The step of determining the output power of the energy storage module (12) and the charging pile (11) based on the static and dynamic data includes: If the remaining power is less than or equal to 0, the actual power of the charging pile (11) is 0, and the charging output power of the energy storage module (12) is 0, then the output power of the energy storage module (12) is 0. If the remaining power is less than or equal to 0, and the sum of the actual power of the charging pile (11) and the charging output power of the integrated storage and charging compartment (1) is greater than the absolute value of the remaining power on the busbar where the integrated storage and charging compartment (1) is located, then the charging output power of the integrated storage and charging compartment (1) is reduced to 0. If the remaining power is less than or equal to 0, and the charging output power of the energy storage module (12) is equal to the absolute value of the remaining power on the busbar where the integrated energy storage and charging chamber (1) is located, then the output power of the charging pile (11) is: P chrout = P chrout The output power of the energy storage module (12) is 0. If the remaining power is less than or equal to 0, and the charging output power of the energy storage module (12) is greater than the absolute value of the remaining power on the busbar where the integrated energy storage and charging chamber (1) is located, then the discharging output power of the energy storage module (12) is: P strdisout =P strchrout -abs(P busrem ); In the formula, abs(P) busrem ) is the absolute value of the remaining power on the busbar where the integrated storage and charging compartment (1) is located; If the discharge output power of the energy storage module (12) is less than or equal to the rated power of the energy storage module (12), then the output power of the charging pile (11) is: P chrout = P chrout The discharge output power of the energy storage module (12) is: P strdisout =P strchrout -abs(P busrem ); If the discharge output power of the energy storage module (12) is greater than the rated power of the energy storage module (12), then the output power of the charging pile (11) is: P chrout = P strrate +abs(P busrem The discharge output power of the energy storage module (12) is: P strdisout = P strrate .

5. The anti-backflow system according to claim 1, characterized in that, The step of adjusting the power supply status between the energy storage module (12), the charging pile (11), and the mains power based on the power supply data includes: When both the energy storage module (12) and the charging pile (11) are simultaneously powered by mains electricity: Power is preferentially supplied to the charging stack (11); if the voltage value of the energy storage module (12) is greater than the charging cut-off voltage value of the energy storage module (12), the mains power supply to the energy storage module (12) is stopped. If the voltage value of the energy storage module (12) is less than the discharge cutoff voltage value of the energy storage module (12), then the energy storage module (12) stops supplying power to the charging pile (11). If the power value of the charging pile (11) is less than the mains power value and the voltage value of the energy storage module (12) is less than the charging cut-off voltage value of the energy storage module (12), then the mains power supplies the charging pile (11), and if there is any remaining power, it supplies the energy storage module (12) until the voltage value of the energy storage module (12) is greater than or equal to the charging cut-off voltage value of the energy storage module (12), at which point the mains power stops supplying the energy storage module (12). If the power value of the charging pile (11) is less than the mains power value and the voltage value of the energy storage module (12) is greater than the charging cut-off voltage value of the energy storage module (12), then the mains power is supplied to the charging pile (11) and the power supply to the energy storage module (12) is stopped. If the power value of the charging pile (11) is equal to the mains power value, then the mains power is supplied to the charging pile (11).

6. The anti-backflow system according to claim 5, characterized in that, Following the step of simultaneously supplying power to the energy storage module (12) and the charging pile (11) using mains power, the following steps are included: During the peak and valley periods of electricity consumption in the area where the integrated energy storage and charging chamber (1) is located, if the mains power value is less than the power value of the charging pile (11) and the power value of the charging pile (11) is less than or equal to the sum of the power value of the charging pile (11) and the mains power value, then the energy storage module (12) and the mains power supply the charging pile (11) simultaneously until the voltage value of the energy storage module (12) is less than or equal to the discharge cutoff voltage value of the energy storage module (12), then the energy storage module (12) stops supplying power to the charging pile (11); and reduces the output power of the charging pile (11) until the power value of the charging pile (11) is less than or equal to the mains power value; During the peak and valley periods of electricity consumption in the area where the integrated energy storage and charging module (1) is located, if the power value of the charging pile (11) is greater than the sum of the power value of the energy storage module (12) and the mains power value, the output power of the charging pile (11) will be reduced until the power value of the charging pile (11) is less than or equal to the sum of the power value of the energy storage module (12) and the mains power value.

7. The anti-backflow system according to claim 1, characterized in that, The steps of determining whether the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are open or closed include: When the mains power supply is simultaneously supplied to the energy storage module (12) and the charging pile (11), the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are closed. When the mains power supply is supplied to the energy storage module (12), the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are closed.

8. The anti-backflow system according to claim 1, characterized in that, The step of adjusting the power supply status between the energy storage module (12), the charging pile (11), and the mains power based on the power supply data includes: When the energy storage module (12) supplies power to the charging pile (11): If the charging pile (11) is not in use, the mains power is supplied to the energy storage module (12). When the mains power supply is supplied to the charging pile (11), if the mains power is overloaded, and the remaining capacity is greater than or equal to 10%, the energy storage module (12) supplies power to the charging pile (11); if the remaining capacity is less than 10%, the output power value of the charging pile (11) is reduced until it is less than or equal to the mains power value. If the power value of the charging pile (11) is less than the mains power value and the voltage value of the energy storage module (12) is less than the charging cut-off voltage value of the energy storage module (12), then the mains power supplies the charging pile (11), and if there is any remaining power, it supplies the energy storage module (12) until the voltage value of the energy storage module (12) is greater than or equal to the charging cut-off voltage value of the energy storage module (12), at which point the mains power stops supplying the energy storage module (12). If the power value of the charging pile (11) is less than the mains power value and the voltage value of the energy storage module (12) is greater than the charging cut-off voltage value of the energy storage module (12), then the mains power is supplied to the charging pile (11) and the power supply to the energy storage module (12) is stopped. If the mains power value is less than the power value of the charging pile (11) and the power value of the charging pile (11) is less than the sum of the power value of the energy storage module (12) and the mains power value, and the voltage value of the energy storage module (12) is greater than the discharge cutoff voltage of the energy storage module (12), then the energy storage module (12) and the mains power supply simultaneously to the charging pile (11). If the mains power value is less than the power value of the charging pile (11) and the power value of the charging pile (11) is equal to the sum of the power value of the energy storage module (12) and the mains power value, and the voltage value of the energy storage module (12) is greater than the discharge cutoff voltage of the energy storage module (12), then the energy storage module (12) and the mains power supply simultaneously to the charging pile (11).

9. The anti-backflow system according to claim 8, characterized in that, After the steps of supplying power to the charging pile (11) using the energy storage module (12), the following steps are included: If the mains power value is less than the power value of the charging pile (11) and the power value of the charging pile (11) is less than or equal to the sum of the power value of the energy storage module (12) and the mains power value, then the energy storage module (12) and the mains power supply simultaneously to the charging pile (11); when the voltage value of the energy storage module (12) is less than or equal to the discharge cutoff voltage of the energy storage module (12), the energy storage module (12) stops supplying power to the charging pile (11) and reduces the output power of the charging pile (11) until the power value of the charging pile (11) is less than or equal to the mains power value; If the power value of the charging pile (11) is greater than the sum of the power value of the energy storage module (12) and the mains power value, the output power of the charging pile (11) is reduced until the power value of the charging pile (11) is less than or equal to the sum of the power value of the energy storage module (12) and the mains power value; when the voltage value of the energy storage module (12) is less than or equal to the discharge cutoff voltage of the energy storage module (12), the output power of the charging pile (11) is reduced until the power value of the charging pile (11) is less than or equal to the mains power value.

10. The anti-backflow system according to claim 1, characterized in that, The steps of determining whether the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are open or closed include: When the energy storage module (12) and the mains power supply are supplied to the charging pile (11), the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are closed. When the energy storage module (12) supplies power to the charging pile (11), the first switch node (16), the second switch node (111), the third switch node (1211), the fourth switch node (1221), the fifth switch node (1231), and the anti-reverse current contactor (15) are closed.

Images