Direct current charging pile power control system and control method

Abstract

The invention discloses a direct-current charging pile power control system and method, and relates to the technical field of direct-current charging pile power control, and the system comprises a first charging module, a second charging module, a third charging module, a fourth charging module and a charging control system, and the first charging module and the second charging module are connected through a first relay. The second charging module and the third charging module are connected through a second relay, and the third charging module and the fourth charging module are connected through a third relay; the first charging module is also connected with the first charging gun through a fourth relay, and the fourth charging module is connected with the second charging gun through a fifth relay; the charging control system comprises a charging control module, a power regulation and control module and a relay control module. The system overcomes the defects in the prior art, and by dynamically adjusting the distribution power of the modules, the use efficiency of the power is improved, the service life of the modules is prolonged, and the use energy consumption of the charging pile is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of DC charging pile power control, and in particular to a DC charging pile power control system and control method. Background Art

[0002] DC charging piles can be divided into two types: split-type and integrated. A dual-charger DC integrated charging pile houses all components, including the charging module, meter, charging port, LCD screen, and card reader, within a single cabinet. The charger is equipped with two DC charging guns, which can output current simultaneously and feature dynamic DC output power distribution.

[0003] Current power distribution technologies are primarily focused on group-controlled, split-type charging stations, lacking an adaptive solution for power distribution in dual-charger, integrated charging stations. The main technical difficulty lies in the fact that when dual-chargers coordinate output, power distribution is constrained by hardware topology and control strategies, leaving each charger permanently in a "half-released" state (e.g., a 160kW device only outputs 120kW), resulting in approximately 20% of rated power wasted. Furthermore, the power distribution logic for group charging lacks a solution to address power fluctuations caused by power reduction when modules are switched out. When load reduction necessitates the active switching out of redundant modules, there is no mechanism to suppress transient power surges (e.g., 60kW step drops). These millisecond-level output fluctuations are directly transmitted to the EV battery, adversely affecting it. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a DC charging pile power control system and control method, which overcomes the shortcomings of the existing technology and has a reasonable design. By dynamically adjusting the distributed power of the module, the power utilization efficiency is improved, the module service life is extended, and the energy consumption of the charging pile is reduced.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A DC charging pile power control system and control method includes a first charging module, a second charging module, a third charging module, a fourth charging module, and a charging control system. The first charging module and the second charging module are connected via a first relay, the second charging module and the third charging module are connected via a second relay, and the third charging module and the fourth charging module are connected via a third relay. The first charging module is also connected to a first charging gun via a fourth relay, and the fourth charging module is connected to a second charging gun via a fifth relay.

[0007] The charging control system includes a charging control module, a power regulation module and a relay control module;

[0008] The charging control module is connected to the vehicle-side BMS for receiving the vehicle's charging requirements and is connected to the power control module for transmitting the charging requirement information to the power control module;

[0009] The power control module is used to dynamically control the power distribution of the first charging module, the second charging module, the third charging module and the fourth charging module according to the charging demand information. The power control module is connected to the relay control module and is used to control the on and off states of the first relay, the second relay, the third relay, the fourth relay and the fifth relay according to the power distribution instruction;

[0010] The relay control module is used to control the on and off of the first relay, the second relay, the third relay, the fourth relay and the fifth relay, and receive feedback status of the relay and transmit the feedback status back to the charging control module.

[0011] The present invention also discloses a DC charging pile power control method, which adopts the above-mentioned DC charging pile power control system; the control method comprises the following steps:

[0012] Step S1: Divide the charging module into four independent power distribution units, corresponding to the first charging module, the second charging module, the third charging module, and the fourth charging module respectively;

[0013] Step S2: Send the vehicle charging demand information to the charging control module, analyze the demand and pass it to the power control module;

[0014] Step S3: The power control module dynamically allocates the output of each charging module based on the charging demand information. When the charging demand power is higher than the rated power of a group of power distribution units, an adjacent group of power distribution units is activated and the charging demand power is evenly distributed to each power distribution unit for output.

[0015] Step S4: When the charging demand power is lower than the total power of the currently-input power distribution unit, the power between the power distribution unit to be switched out and the power distribution unit to be continued is dynamically adjusted;

[0016] Step S5: When the power distribution unit is switched on or off, the power control module adjusts the on / off status of each relay in real time through the relay control module to ensure accurate power distribution, and feeds back the adjusted status to the charging control module.

[0017] Preferably, in step S3, when a group of adjacent power distribution units are put into use, the newly added power distribution unit first outputs according to the required voltage, and then the relay control module is used to control the relay between the two power distribution units to be attracted.

[0018] Preferably, in step S3, after the adjacent power distribution units are put into operation and the corresponding relays are energized, the total output power of the newly added power distribution units and the original power distribution units is equal to the charging demand power and remains unchanged for a period of time, and then the power of all the put-in-power distribution units is evenly divided.

[0019] Preferably, in step S4, when the required charging power decreases, the power distribution units that have been put into use are firstly divided equally, and then the redundant power distribution units are gradually cut out according to actual demand.

[0020] Preferably, the charging power required by the first charging gun is allocated in sequence according to the priority calling order of the first charging module, the second charging module, the third charging module and the fourth charging module, and the charging power required by the second charging gun is allocated in sequence according to the priority calling order of the fourth charging module, the third charging module, the second charging module and the first charging module; the first charging gun and the second charging gun are prioritized according to the first-come-first-served or the larger charging power allocation logic.

[0021] Preferably, in step S4, when the charging demand power decreases, the power distribution units that have been put into use are firstly divided equally, and when When the outermost power distribution unit is Power adjustment is performed, while the other inner power distribution units follow Perform power adjustments;

[0022] in, The power required for charging is is the output power of each power distribution unit after equal distribution, n is the number of power distribution units put into use, and i is the buffer coefficient; is the output power of the outermost power distribution unit after adjustment, is the output power of the remaining inner power distribution units after adjustment; Parameter value for dynamically adjusting power.

[0023] Preferably, The value is dynamically adjusted according to the size of the power delivered by the outermost power distribution unit.

[0024] Preferably, in step S4, the cut-out time of the outermost power distribution unit is based on The value is adjusted dynamically.

[0025] This invention provides a DC charging pile power control system and method, which achieves the following beneficial effects: by dynamically adjusting the module's allocated power, it improves power utilization efficiency, extends module service life, and reduces the charging pile's energy consumption. This dynamic adjustment strategy ensures that the module's output power always matches the required power during switching, preventing abnormal power reductions and protecting the battery, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for describing the present invention or the prior art.

[0027] Figure 1 A schematic diagram of the electrical structure of the present invention;

[0028] Figure 2 Dynamic control logic diagram of the charging module when the charging demand power increases in the present invention;

[0029] Figure 3 Dynamic control logic diagram of the charging module when the charging demand power decreases in the present invention;

[0030] Description of the numbers in the figure:

[0031] 1. First charging module; 2. Second charging module; 3. Third charging module; 4. Fourth charging module; 5. Charging control system; 6. First relay; 7. Second relay; 8. Third relay; 9. Fourth relay; 10. First charging gun; 11. Fifth relay; 12. Second charging gun; 51. Charging control module; 52. Power control module; 53. Relay control module. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0033] Examples, such as Figure 1-3 As shown, the present invention discloses a DC charging pile power control system and control method, including a first charging module 1, a second charging module 2, a third charging module 3, a fourth charging module 4 and a charging control system 5. The first charging module 1 and the second charging module 2 are connected via a first relay 6, the second charging module 2 and the third charging module 3 are connected via a second relay 7, and the third charging module 3 and the fourth charging module 4 are connected via a third relay 8; the first charging module 1 is also connected to a first charging gun 10 via a fourth relay 9, and the fourth charging module 4 is connected to a second charging gun 12 via a fifth relay 11;

[0034] The charging control system 5 includes a charging control module 51, a power regulation module 52 and a relay control module 53;

[0035] The charging control module 51 is connected to the vehicle-side BMS for receiving the vehicle's charging requirements and is connected to the power control module 52 for transmitting the charging requirement information to the power control module 52;

[0036] The power control module 52 is used to dynamically control the power distribution of the first charging module 1, the second charging module 2, the third charging module 3 and the fourth charging module 4 according to the charging demand information. The power control module 52 is connected to the relay control module 53 and is used to control the on and off states of the first relay 6, the second relay 7, the third relay 8, the fourth relay 9 and the fifth relay 11 according to the power distribution instruction;

[0037] The relay control module 53 is used to control the on and off of the first relay 6 , the second relay 7 , the third relay 8 , the fourth relay 9 and the fifth relay 11 , and receives feedback status of the relays and transmits the feedback status back to the charging control module 51 .

[0038] Working principle:

[0039] In the present invention, the first charging module 1, the second charging module 2, the third charging module 3, and the fourth charging module 4 are all AC / DC modules, used to convert alternating current (AC) into direct current (DC) for output. The charging control system 5 controls the entire charging process. It connects to all hardware units, processes information transmitted from the vehicle-side BMS and each module, including electrical sampling information and charging messages, and controls the operation of each electrical component to ensure normal charging and power output according to vehicle-side requirements. This allows for dynamic power regulation and module switching. The charging control module 51 regulates the charging process, interacting with the vehicle-side BMS and sending charging requests to the power control module 52. The power control module 52 dynamically allocates power to each charging module based on the received requests. Upon receiving the requests from the charging control module, the power control module allocates power to the modules according to the charging requirements and sends relay closure requests to the relay control module based on the module's activation status, ensuring charging efficiency and safety. The relay control module 53 executes on / off commands, providing real-time status feedback to ensure stable system operation. Through the coordinated operation of these modules, the system can monitor and adjust the charging status in real time, effectively preventing overcharging or undercharging.

[0040] The present invention also discloses a DC charging pile power control method, which adopts the above-mentioned DC charging pile power control system; the control method comprises the following steps:

[0041] Step S1: Divide the charging module into four independent power distribution units, corresponding to the first charging module 1, the second charging module 2, the third charging module 3, and the fourth charging module 4 respectively; each charging module is a group of power distribution units;

[0042] Step S2: Send the vehicle charging demand information to the charging control module 51, which analyzes the demand and passes it to the power control module 52;

[0043] Step S3: The power control module 52 dynamically allocates the output of each charging module according to the charging demand information; when the charging demand power is higher than the rated power of a group of power distribution units, an adjacent group of power distribution units is activated and the charging demand power is evenly distributed to each power distribution unit for output;

[0044] Specifically, when the charging demand power is less than or equal to the rated power of a group of power distribution units (i.e. ), enable one group of power distribution units, and keep the other units in standby mode to ensure charging efficiency and safety and avoid resource waste. When the charging power requirement is between the rated power of one to two groups of power distribution units (i.e. ), enable two groups of power distribution units and distribute power in proportion to ensure balanced load on each unit. When the charging demand power is between the rated power of two to three groups of power distribution units (i.e. ) Activate three power distribution units and distribute power proportionally to ensure load balance and avoid overloading of a single unit. When the charging power demand exceeds the rated power of the three power distribution units, fully activate all four power distribution units and distribute power proportionally to ensure load balance among the units and avoid overload risks;

[0045] Step S4: When the charging demand power is lower than the total power of the currently invested power distribution unit, the module will not be cut out immediately. Instead, the power between the power distribution unit to be cut out and the power distribution unit that continues to be invested is dynamically adjusted at this time; to achieve a smooth transition of power, a gradual adjustment strategy can be adopted to gradually increase or decrease the output power of each unit to ensure stable operation of the system and avoid damage to the equipment caused by instantaneous power fluctuations.

[0046] Specifically, when the required power is reduced, in order to prevent the power distribution unit from being repeatedly switched on and off due to the required power jitter, the output power of each power distribution unit is first reduced so that the output power of each power distribution unit is . And when When the outermost power distribution unit is Power adjustment is performed, while the other inner power distribution units follow Perform power adjustments;

[0047] in, The power required for charging is is the output power of each power distribution unit after equal distribution, n is the number of power distribution units put into use, and i is the buffer coefficient; is the output power of the outermost power distribution unit after adjustment, is the output power of the remaining inner power distribution units after adjustment; Parameter value for dynamically adjusting power. The value of is dynamically adjusted according to the size of the power delivered by the outermost power distribution unit. The greater the output power, the The value will also increase accordingly. The smaller the output power, the The value will decrease accordingly.

[0048] In addition, in order to ensure that the outermost power distribution unit can be switched out faster, the present invention is provided with a switch-out time mechanism. The value is determined when The values ​​in different ranges correspond to different cut-out times.

[0049] Step S5: When the power distribution unit is switched on or off, the power control module 52 adjusts the on / off status of each relay in real time through the relay control module 53 to ensure accurate power distribution, and feeds back the adjusted status to the charging control module 51.

[0050] Among them, in step S3, when a group of adjacent power distribution units are put into use, the newly added power distribution unit first outputs according to the required voltage, and then the relay control module 53 is used to control the relay between the two power distribution units to be attracted.

[0051] After the adjacent power distribution units are put into operation and the corresponding relays are energized, the total output power of the newly added power distribution units and the original power distribution units is equal to the charging demand power and remains unchanged for a period of time, and then the power of all the put-in-power distribution units is evenly divided.

[0052] In addition, the present invention also sets up a power anti-shake mechanism to avoid the difference in the rate when the power unit increases and decreases the power. According to the actual situation of the charging module, the rate when increasing the power is slower than the rate when decreasing the power. Therefore, a dynamic adjustment strategy is adopted, and the faster-changing power follows the slower-changing power to achieve real-time regulation, and at the same time ensure that the total output power of the charging distribution unit is equal to the charging demand power.

[0053] In the present invention, the charging power required by the first charging gun 10 is allocated in the order of priority of the first charging module 1, the second charging module 2, the third charging module 3, and the fourth charging module 4. Specifically, the power required by the first charging gun 10 is allocated in the order of priority of the first charging module 1 > the second charging module 2 > the third charging module 3 > the fourth charging module 4. The power required by the second charging gun 12 is allocated in the order of priority of the fourth charging module 4, the third charging module 3, the second charging module 2, and the first charging module 1. Specifically, the power required by the second charging gun 12 is allocated in the order of priority of the fourth charging module 4 > the third charging module 3 > the second charging module 2 > the first charging module 1. Priority is assigned between the first and second charging guns 10, 12 based on either a first-come, first-served or a higher power priority logic. First-come, first-served prioritizes the power required by the earlier charging start, while power priority prioritizes the power required by the higher power.

[0054] like Figure 2 The figure illustrates the dynamic control of the power distribution unit's allocated power as the power demand increases. The red line represents the charging power demand, the blue line represents the allocated power for the first charging module 1, and the green line represents the allocated power for the second charging module 2. As can be seen from the figure, the module power allocation can be divided into three stages when the charging power demand increases. The first stage is when the output power of the first charging module 1 meets the entire power demand. The second stage is when the first charging module 1 outputs full power, and the second charging module 2 begins to output power. The power demand is met by the combined power of the first charging module 1 and the second charging module 2. The third stage is when the power demand stabilizes, and the output power of the first charging module 1 and the second charging module 2 is redistributed evenly.

[0055] like Figure 3The figure illustrates the dynamic control of the power distribution unit's power allocation when the charging power demand decreases. The red line represents the charging power demand, the blue line represents the power allocated to the first charging module 1, and the green line represents the power allocated to the second charging module 2. As can be seen from the figure, when the charging power demand decreases, the module power allocation can be divided into four stages. The first stage is before the charging power demand decreases, when the output power of the first and second charging modules 1 and 2 meet the charging power demand. The second stage is when the charging power demand begins to decrease. At this time, the output power of the first and second charging modules 1 and 2 decreases together, ensuring that the output power of the first and second charging modules 1 and 2 meet the charging power demand. The third stage is when the charging power demand continues to decrease to a certain percentage below the rated output power of each module. At this time, the output of the second charging module 2 gradually decreases to zero over a certain period of time, while the first charging module 1 dynamically adjusts its power to ensure that the output power of the first and second charging modules 1 and 2 meet the charging power demand. The fourth stage is when the charging power demand stabilizes at a low level, and the first charging module 1 independently maintains its output to meet the charging power demand. This ensures efficient and stable system operation and avoids resource waste. When the system detects a further increase in the required charging power, it restarts the second charging module 2, gradually increasing its output power as needed until it, along with the first charging module 1, meets the new required power, ensuring charging efficiency and system stability. This dynamic adjustment mechanism allows the system to flexibly respond to varying charging demands, optimize resource allocation, and improve overall charging efficiency. The modules work together to ensure efficient and stable operation under varying power demands, extending equipment life and reducing energy consumption.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A DC charging pile power control system, characterized by: The invention comprises a first charging module (1), a second charging module (2), a third charging module (3), a fourth charging module (4) and a charging control system (5), wherein the first charging module (1) and the second charging module (2) are connected via a first relay (6), the second charging module (2) and the third charging module (3) are connected via a second relay (7), and the third charging module (3) and the fourth charging module (4) are connected via a third relay (8); the first charging module (1) is further connected to a first charging gun (10) via a fourth relay (9), and the fourth charging module (4) is connected to a second charging gun (12) via a fifth relay (11); The charging control system (5) comprises a charging control module (51), a power regulation module (52) and a relay control module (53); The charging control module (51) is connected to the vehicle-side BMS for receiving the vehicle charging demand, and is connected to the power control module (52) for transmitting the charging demand information to the power control module (52); The power control module (52) is used to dynamically control the power distribution of the first charging module (1), the second charging module (2), the third charging module (3) and the fourth charging module (4) according to the charging demand information. The power control module (52) is connected to the relay control module (53) and is used to control the on / off state of the first relay (6), the second relay (7), the third relay (8), the fourth relay (9) and the fifth relay (11) according to the power distribution instruction; The relay control module (53) is used to control the on / off of the first relay (6), the second relay (7), the third relay (8), the fourth relay (9) and the fifth relay (11), and receives feedback status of the relays and transmits the feedback status back to the charging control module (51).

2. A DC charging pile power control method, characterized by: The DC charging pile power control system according to claim 1 is adopted; the control method comprises the following steps: Step S1: Divide the charging module into four independent power distribution units, corresponding to the first charging module (1), the second charging module (2), the third charging module (3), and the fourth charging module (4); Step S2: Sending the vehicle charging demand information to the charging control module (51), analyzing the demand and passing it to the power control module (52); Step S3: The power control module (52) dynamically allocates the output of each charging module according to the charging demand information; when the charging demand power is higher than the rated power of a group of power distribution units, an adjacent group of power distribution units is put into use, and the charging demand power is evenly distributed to each power distribution unit for output; Step S4: When the charging demand power is lower than the total power of the currently-input power distribution unit, the power between the power distribution unit to be switched out and the power distribution unit to be continued is dynamically adjusted; Step S5: When the power distribution unit is switched on or off, the power control module (52) adjusts the on / off status of each relay in real time through the relay control module (53) to ensure accurate power distribution, and feeds back the adjusted status to the charging control module (51).

3. A DC charging pile power control method according to claim 2, characterized in that: In step S3, when a group of adjacent power distribution units are put into operation, the newly added power distribution unit first outputs according to the required voltage, and then controls the relay between the two power distribution units to be attracted through the relay control module (53).

4. A DC charging pile power control method according to claim 1, characterized in that: In step S3, after the adjacent power distribution units are put into operation and the corresponding relays are energized, the total output power of the newly added power distribution units and the original power distribution units is equal to the charging demand power and remains unchanged for a period of time, and then the power of all the put-in-power distribution units is evenly divided.

5. A DC charging pile power control system and control method according to claim 1, characterized in that: In step S4, when the charging demand power decreases, the power distribution units that have been put into use are firstly divided equally, and then the redundant power distribution units are gradually switched out according to actual demand.

6. A DC charging pile power control method according to claim 1, characterized in that: The charging power required by the first charging gun (10) is allocated in sequence according to the priority calling order of the first charging module (1), the second charging module (2), the third charging module (3) and the fourth charging module (4); the charging power required by the second charging gun (12) is allocated in sequence according to the priority calling order of the fourth charging module (4), the third charging module (3), the second charging module (2) and the first charging module (1); priority is allocated between the first charging gun (10) and the second charging gun (12) according to a first-come-first-served or a larger charging power allocation logic.

7. A DC charging pile power control method according to claim 1, characterized in that: In step S4, when the charging demand power decreases, the power distribution units that have been put into use are firstly divided equally, and when When the outermost power distribution unit is Power adjustment is performed, while the other inner power distribution units follow Perform power adjustments; in, The power required for charging is is the output power of each power distribution unit after equal distribution, n is the number of power distribution units put into use, and i is the buffer coefficient; is the output power of the outermost power distribution unit after adjustment, is the output power of the remaining inner power distribution units after adjustment; Parameter value for dynamically adjusting power.

8. A DC charging pile power control method according to claim 7, characterized in that: The value is dynamically adjusted according to the size of the power delivered by the outermost power distribution unit.

9. A DC charging pile power control method according to claim 7, characterized in that: In step S4, the cut-out time of the outermost power distribution unit is based on The value is adjusted dynamically.

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