Three-phase balanced charging power distribution method and device for charging pile

Abstract

The application provides a charging pile three-phase balanced charging power distribution method and device, the method comprising: receiving a new charging request sent by a new terminal, the new charging request carrying a first correspondence relationship between a new terminal identifier, a new demand voltage and a new demand current; determining whether there is an idle AC-DC conversion module; if not, determining the number of AC-DC conversion modules to be redistributed, denoted as a first number; and determining a demand current sum to be redistributed, the demand current sum being the sum of the new demand current and an old demand current, the old demand current being the demand current of each terminal currently being charged; dividing the demand current sum to be redistributed equally into the first number of parts, and establishing a second correspondence relationship between each part of the demand current and an AC-DC conversion module identifier, a terminal identifier and a demand voltage, so that the charging power routing performs power distribution according to the second correspondence relationship. The application improves the stability of the receiving power grid.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging technology, and in particular to a method and device for three-phase balanced charging power distribution in a charging pile. Background Technology

[0002] Currently, charging pile systems on the market are broadly divided into AC charging piles and DC charging piles. AC charging piles operate by connecting to the power grid via single-phase or three-phase connection, directly outputting AC power to the electric vehicle. The on-board charger (OBC) module in the electric vehicle converts the AC power to DC power and outputs the DC power to the electric vehicle's battery. AC charging piles generally have a lower charging current and longer charging time, making them suitable for home use or individual users with fixed parking spaces. DC charging piles operate by connecting to the power grid via three-phase connection. The AC / DC converter module in the charging pile converts the AC power to DC power and then outputs the DC power to the electric vehicle. DC charging piles generally have a higher charging current and shorter charging time, making them suitable for public charging stations and some operational charging stations.

[0003] Recently, a type of low-power DC charging pile has emerged. Like AC charging piles, it connects to the power grid via a single-phase connection, completing the AC-to-DC conversion internally. Similar to traditional DC charging piles, it outputs DC power to the electric vehicle, communicating with the vehicle's Battery Management System (BMS) module to charge the battery. The power output of this low-power DC charging pile is comparable to that of an AC charging pile, but it eliminates the need for an on-board charger (OBC) within the electric vehicle. The size of this charging system is customizable; it can be designed as a large charging pile with multi-terminal power distribution or as a portable micro-charging pile carried by the vehicle. It can be used as a home charging pile or installed in public charging stations and operational charging stations.

[0004] However, since low-power DC group charging piles are connected to the power grid through single-phase AC, when one or more electric vehicles are charging, it is easy to cause phase imbalance at the input end of the charging pile, which in turn causes the power grid to rotate, resulting in low grid stability. Summary of the Invention

[0005] This application provides a three-phase balanced charging power distribution method and device for charging piles to solve the problems mentioned in the background art.

[0006] Firstly, this application provides a method for three-phase balanced charging power distribution in a charging pile, including:

[0007] Receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current;

[0008] Determine if there are any available AC / DC converter modules;

[0009] If not, determine the number of AC / DC conversion modules to be reallocated, denoted as the first number; and determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently charging.

[0010] The required current to be redistributed is divided into a first number of parts, and a second correspondence is established between each part of the required current and the AC / DC conversion module identifier, terminal identifier, and required voltage, so that the charging power routing allocates power according to the second correspondence.

[0011] Optionally, after determining whether there is an available AC / DC conversion module, the method further includes:

[0012] If there are available AC / DC converters, determine whether they can meet the new charging request;

[0013] If possible, establish a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage.

[0014] Optionally, establishing a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage includes:

[0015] Determine the sum of the new demand currents carried by the new charging request, and denot it as the sum of new demand currents;

[0016] The new required current is divided into three equal parts;

[0017] Establish a third correspondence between each new demand current, AC / DC conversion module identifier, new terminal identifier, and new demand voltage.

[0018] Optionally, determining the number of AC / DC conversion modules to be reallocated includes:

[0019] Determine the total number of AC / DC conversion modules, and denote it as the second quantity;

[0020] Determine the third number of terminals that are powered only by a single AC / DC conversion module;

[0021] Determine a first difference between the second quantity and the third quantity, and determine the first difference as the first quantity.

[0022] Optionally, after determining whether an idle AC / DC converter can meet a new charging request, the method further includes:

[0023] If an idle AC / DC converter cannot meet a new charging request, the process described above determines the number of AC / DC converters to be reallocated.

[0024] Secondly, this application provides a three-phase balanced charging power distribution device for a charging pile, comprising:

[0025] The receiving module is used to receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current;

[0026] The first determining module is used to determine whether there is an available AC / DC conversion module;

[0027] The second determining module is used to determine the number of AC / DC conversion modules to be reallocated if none exist, denoted as the first number; and to determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently being charged.

[0028] The first establishment module is used to divide the demand current to be redistributed into a first number of parts, and establish a second correspondence between each part of the demand current and the AC / DC conversion module identifier, terminal identifier, and demand voltage, so that the charging power routing performs power distribution according to the second correspondence.

[0029] Optionally, the device further includes:

[0030] The third determining module is used to determine whether an available AC / DC converter can meet a new charging request if there is an available AC / DC converter.

[0031] The second module is used to establish a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage, if possible.

[0032] Thirdly, embodiments of this application provide a computer electronic device, including:

[0033] One or more processors;

[0034] Memory, used to store one or more programs;

[0035] When one or more programs are executed by one or more processors, the one or more processors execute the method described in the first aspect above.

[0036] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being used to implement the method of the first aspect described above.

[0037] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect.

[0038] The three-phase balanced charging power distribution method for charging piles provided in this application determines the number of AC / DC conversion modules to be redistributed, denoted as the first quantity; and determines the demand current to be redistributed, where the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal currently charging; the demand current to be redistributed is divided equally into the first quantity parts; thus, each part of the demand current corresponds to an AC / DC conversion module, achieving the effect of basically evenly distributing the demand current to the three-phase power. Compared with the prior art, when one or more electric vehicles are charging, it is easy to cause phase imbalance at the input end of the charging pile, which causes grid instability and low grid stability; this application evenly distributes the demand current of one or more electric vehicles, making the three-phase power of the charging pile relatively stable, thereby improving the stability of the grid. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 An implementation environment architecture diagram of a three-phase balanced charging power distribution method for charging piles provided in this application embodiment;

[0041] Figure 2 A flowchart of a three-phase balanced charging power distribution method for a charging pile is provided as an embodiment of this application;

[0042] Figure 3 A flowchart of a three-phase balanced charging power distribution method for a charging pile is provided as another embodiment of this application;

[0043] Figure 4 A flowchart illustrating a method for establishing a third correspondence relationship provided in this application embodiment;

[0044] Figure 5 A block diagram of a three-phase balanced charging power distribution device for a charging pile provided in an embodiment of this application;

[0045] Figure 6 A block diagram of a three-phase balanced charging power distribution device for a charging pile provided in an embodiment of this application;

[0046] Figure 7 This application provides a schematic diagram of charging power allocation after a central control unit receives a charging request for the first time.

[0047] Figure 8 A schematic diagram of charging power allocation after the central control unit receives a second charging request, provided in an embodiment of this application;

[0048] Figure 9 A schematic diagram of charging power allocation after the central control unit receives a charging request for the third time, provided in an embodiment of this application;

[0049] Figure 10 This is a schematic diagram of the structure of a computer system according to an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application. In addition, it should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] Figure 1 This is an implementation environment architecture diagram of a three-phase balanced charging power distribution method for a charging pile, as shown in the embodiments of this application. The structures included in this architecture diagram are also key components inside the charging pile, such as... Figure 1 As shown, the implementation environment architecture includes: a three-phase AC power supply, an AC / DC conversion module, a central control unit, a charging power routing module, and a terminal.

[0052] The three-phase AC power supply is used to provide three-phase AC power to the charging pile, which can generally be referred to as phase A, phase B and phase C. Each phase is connected to one or more AC-DC conversion modules. The number of AC-DC conversion modules connected to each phase can be the same or different. This application describes the case of the same phase as an example.

[0053] The AC / DC conversion module, along with the three-phase AC power supply and charging power routing module (CPR), receives AC power from the three-phase AC power supply, converts it to DC power, and then outputs it to the charging power routing module. Further, the AC / DC conversion module includes multiple modules, for example, six: a first AC / DC conversion module, a second AC / DC conversion module, a third AC / DC conversion module, a fourth AC / DC conversion module, a fifth AC / DC conversion module, and a sixth AC / DC conversion module. Furthermore, the models of the AC / DC conversion modules can be the same or different; this application describes them as the same. Each AC / DC conversion module operates in horizontal power mode when its output voltage is within a certain range, such as 200V-800V. For example, the output power of the AC / DC conversion module within the horizontal power range is 7kW; with a 300V output voltage, the maximum output current is 23A; and with a 200V output voltage, the maximum output current is 35A.

[0054] The system typically includes multiple terminals, for example, six terminals: Terminal 1, Terminal 2, Terminal 3, Terminal 4, Terminal 5, and Terminal 6. Each terminal is connected to at least one charging gun. For instance, each terminal connects to one charging gun. Using the example above, the six charging guns corresponding to the six terminals are, in order, the first, second, third, fourth, fifth, and sixth charging guns. Each charging gun has a CAN interface, which connects to the electric vehicle's charging interface (i.e., the electric vehicle's CAN interface signal), thus achieving connection with the electric vehicle's BMS (Battery Management System).

[0055] The charging gun obtains the vehicle's charging requirements from the BMS via CAN communication. The charging gun then sends the obtained charging requirements to the terminal, which in turn forwards them to the central control unit. For example, if a user uses the first charging gun, the charging requirement it obtains from the BMS is 200V, 30A. The first charging gun sends this 200V, 30A charging requirement to the first terminal, which then forwards it to the central control unit.

[0056] The hardware structure of a terminal typically includes a processor, memory, and communication components.

[0057] The central control unit (CCU) receives charging requests from terminals, generates a charging plan based on these requests, and sends the plan to the charging power routing module. For example, using the previous example, all six AC / DC converters can meet the 200V, 30A charging requirement. However, using only one converter would lead to three-phase power imbalance. Therefore, one AC / DC converter can be selected from each phase to power the first terminal. For instance, the charging plan generated by the CCU could be that the first converter provides 200V, 10A, the third converter provides 200V, 10A, and the fifth converter provides 200V, 10A.

[0058] Furthermore, the structure of the central control unit generally includes a processor, memory, communication components, etc., and serves as the main component for data processing and command transmission and reception during the charging process.

[0059] The charging power routing module is connected to the central control unit and multiple AC / DC conversion modules. It receives charging plans from the central control unit, allocates and controls the output power of the multiple AC / DC conversion modules according to the charging plan, and sends the allocated DC power to the corresponding terminals. The terminals also receive the DC power from the charging power routing module and supply it to the electric vehicle's battery through the charging gun.

[0060] Furthermore, the charging power routing module uses various electrical components such as relays to distribute power. For further details on the power distribution implementation method, please refer to relevant content, which will not be elaborated here.

[0061] Additionally, it should be noted that in this application, the number and model of AC / DC conversion modules corresponding to each phase of electricity are the same. Furthermore, the number and model of AC / DC conversion modules corresponding to each phase of electricity, as well as the number of terminals, can be determined according to actual needs. This application is only used as an example where one phase of electricity corresponds to two AC / DC conversion modules, with a total of 6 terminals.

[0062] Figure 2 This is a flowchart illustrating a three-phase balanced charging power distribution method for a charging pile according to an embodiment of this application. Figure 2 The method shown can be derived from Figure 1 The central control unit in the middle executes, such as Figure 2 As shown, the method includes the following steps:

[0063] Step 201: Receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current.

[0064] In this context, a new charging request refers to a new charging request received by the central control unit from a terminal. The new terminal is the terminal that sent the new charging request.

[0065] For example, this application describes a scenario where each phase of electricity corresponds to two AC / DC conversion modules (a total of six AC / DC conversion modules). Further, assume that the first correspondence carried by a new charging request received at the current time is as shown in Table 1 below:

[0066] Table 1

[0067] New terminal logo Fifth Terminal Sixth Terminal New demand voltage 300V 300V New demand current 40A 30A

[0068] Additionally, it should be noted that the new charging request received at the current time may not be the first charging request received by the central control unit. That is, a charging request may have already been received before the central control unit received this new charging request, and the charging pile may have already provided power to the terminal based on the charging request. Further, the terminal currently charging is referred to as the old terminal, its corresponding required voltage as the old required voltage, and its corresponding required current as the old required current. For example, before receiving this new charging request, the central control unit may have already received two charging requests, denoted as the first charging request and the second charging request, and has provided power to the old terminal based on the first and second charging requests, and the power supply has not yet ended at the current time.

[0069] The first correspondence carried in the first charging request is shown in Table 2 below:

[0070] Table 2

[0071] Old terminal identifier First Terminal Old demand voltage 200V Old demand current 30A

[0072] As shown in Table 2 above, the first charging request is to provide 200V and 30A of power to the first terminal.

[0073] Furthermore, for the first charging request, the first charging plan generated for the first terminal is shown in Table 3 below:

[0074] Table 3

[0075]

[0076] See also Figure 7 Table 3 above means that the first terminal is provided by the first AC / DC conversion module, the third AC / DC conversion module and the fifth AC / DC conversion module, and the voltage and current provided by the three AC / DC conversion modules are all 200V and 10A.

[0077] Furthermore, the first correspondence carried in the second charging request is as shown in Table 4 below:

[0078] Table 4

[0079] New terminal logo Second terminal Third terminal New demand voltage 200V 200V New demand current 20A 30A

[0080] As shown in Table 4 above, the second charging request is to provide 200V, 20A of power to the second terminal and 200V, 30A of power to the third terminal.

[0081] Furthermore, for the second charging request, the first charging plan generated for the second and third terminals is shown in Table 5 below:

[0082] Table 5

[0083]

[0084]

[0085] See also Figure 8 Table 5 above means that the second terminal is powered through the second AC / DC conversion module, with a voltage and current of 200V and 20A. The third terminal is powered through the fourth and sixth AC / DC conversion modules, with a voltage and current of 200V and 15A for each module.

[0086] In this example, up to the current time, the central control unit has received three charging requests: the first charging request sent by the first terminal, the second charging request sent by the second and third terminals, and the third charging request sent by the fifth and sixth terminals. The third charging request is the new charging request mentioned in step 201.

[0087] Furthermore, the central control unit records each charging plan so that it can be retrieved promptly when needed. For example, the charging plans recorded by the central control unit up to the current time are shown in Table 6 below.

[0088] Table 6

[0089] AC / DC conversion module name Provided voltage and current Terminal Name First AC / DC transfer module 200V, 10A First Terminal Second AC / DC conversion module 200V, 20A Second terminal Third AC / DC conversion module 200V, 10A First Terminal Fourth AC / DC conversion module 200V, 15A Third terminal Fifth AC / DC conversion module 200V, 10A First Terminal Sixth AC / DC conversion module 200V, 15A Third terminal

[0090] Step 202: Determine if there are any available AC / DC conversion modules.

[0091] The central control unit queries the charging plan recorded up to the current time to determine whether the AC / DC conversion module identifier matches the terminal identifier. If there is a corresponding terminal identifier, the AC / DC conversion module is considered to be active. If there is no corresponding terminal identifier, the AC / DC conversion module is considered to be idle, thus determining whether there are any idle AC / DC conversion modules.

[0092] For example, taking the new charging request in step 201 as the central control unit receiving the third charging request, after receiving the new charging request, the central control unit queries Table 6 above and finds that all 6 AC / DC conversion modules are in use and there are no idle AC / DC conversion modules.

[0093] Step 203: If not, determine the number of AC / DC conversion modules to be reallocated, denoted as the first number; and determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently charging.

[0094] If there are no available AC / DC converter modules, it means that all AC / DC converter modules are in use. Therefore, when a new charging request is received, the charging demand will inevitably increase, so all AC / DC converter modules will still be used.

[0095] However, for terminals that are currently charging, there may be situations where they are powered only by a single AC / DC converter module. When redistributing AC / DC converter modules, it's possible that terminals powered only by this module will be disconnected from their corresponding modules. This would result in temporary power loss for the terminal, leading to unstable power supply and potentially damaging the electric vehicle's battery. Therefore, redistribution is no longer performed for terminals powered only by a single AC / DC converter module.

[0096] In step 203, determining the number of AC / DC conversion modules to be reallocated can be achieved through the following steps:

[0097] Step 1: Determine the total number of AC / DC conversion modules, denoted as the second quantity.

[0098] The total number of AC / DC conversion modules is the total number of AC / DC conversion modules corresponding to three-phase power.

[0099] Step two, determine the third number of terminals that are powered by only one AC / DC conversion module.

[0100] Step 3: Determine the first difference between the second quantity and the third quantity, and determine the first difference as the first quantity.

[0101] For example, taking the third charging request received by the central control unit as the new charging request mentioned above, the second quantity is 6; only the second terminal is powered by only one AC / DC conversion module, which is the second AC / DC conversion module as shown in Table 6, so the third quantity is 1; then the first difference is 5, that is, the number of AC / DC conversion modules to be redistributed is 5.

[0102] Since the second terminal is solely powered by the second AC / DC conversion module, there is no need to reallocate the AC / DC conversion module. Therefore, the current demand to be reallocated does not include the current demand required by the second terminal. Thus, the new current demand to be reallocated is 40A for the fifth terminal and 30A for the sixth terminal; the old current demand to be reallocated is 30A for the first terminal and 30A for the third terminal; therefore, the sum of the current demands to be reallocated is 130A.

[0103] Step 204: Divide the demand current to be redistributed into a first number of parts, and establish a second correspondence between each part of the demand current and the AC / DC conversion module identifier, terminal identifier, and demand voltage.

[0104] It should be noted here that the average score is not an absolute average, but rather an average score that is as even as possible while meeting charging needs as much as possible.

[0105] For example, continuing with the above example, since the second terminal does not need to be redistributed, the total current required by the first, third, fifth, and sixth terminals is 130A. This 130A current is supplied through five AC / DC conversion modules, so the 130A current is divided into five equal parts, each 26A. 26A is approximately equal to the current provided by one AC / DC conversion module, while the current required by the fifth terminal is 40A, which is close to the current provided by two AC / DC conversion modules. Therefore, the five current parts are: 30A for the first terminal, 30A for the third terminal, 20A for the fifth terminal, 20A for the sixth terminal, and 30A for the sixth terminal. Furthermore, since the first and third terminals are already charging, during redistribution, they can continue to be powered by one or more of the AC / DC conversion modules that originally supplied them. For example, if the AC / DC conversion modules that originally powered the first terminal were the first AC / DC conversion module, the third AC / DC conversion module, and the fifth AC / DC conversion module, then the first terminal can continue to be powered through one of them, such as the fifth AC / DC conversion module. Similarly, the third terminal can continue to be powered through the sixth terminal. Therefore, after the reallocation, the second correspondence can be as shown in Table 7 below:

[0106] Table 7

[0107]

[0108] When a charging gun is charging an electric vehicle, the output voltage of the AC / DC module matches the required voltage. Therefore, the actual charging current may not meet the required current, resulting in a discrepancy between the required current and the actual current supplied. For example, refer to Table 8 below or refer to... Figure 9For the sixth terminal, the required voltage is 300V and the required current is 30A. However, at a voltage of 300V, the maximum current that can be provided is only 23A, which cannot meet the required current of 30A.

[0109] Table 8

[0110]

[0111] The above example describes a scenario where the central control unit receives a new charging request but there is no available AC / DC converter module. However, if the central control unit receives a new charging request and there is an available AC / DC converter module, see [link to example]. Figure 3 The power distribution method also includes steps 205-207.

[0112] Step 205: If there are available AC / DC converter modules, determine whether the available AC / DC converter modules can meet the new charging request.

[0113] The following method can be used to determine whether an idle AC / DC converter can meet a new charging request: Determine the total current that the idle AC / DC converter can provide, and determine the total current required by the new charging request. If the total current that can be provided is approximately equal to the total current required, the new charging request can be met. If the second difference between the total current that can be provided and the total current required is large, the new charging request cannot be met.

[0114] Furthermore, the second difference can be determined using empirical values, for example, the second difference is 60A.

[0115] For example, taking the second charging request received by the central control unit as an example, when a new charging request is received, the charging status of the charging pile is as shown in Table 3. In Table 3, only the first AC / DC conversion module is used. The third and fifth AC / DC conversion modules are not used. Therefore, when the required voltage is 200V, the idle AC / DC conversion modules can provide a total current of 90A, while the total required current is 50A. Therefore, the idle AC / DC conversion modules can meet the charging request.

[0116] Step 206: If possible, establish a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage.

[0117] If an available AC / DC converter can meet the required current, the original power supply allocation can be kept unchanged, and the available AC / DC converter can be used directly to power the new terminal.

[0118] See Figure 4Step 206 can be achieved through the following steps 2061-2063:

[0119] Step 2061: Determine the sum of the new demand currents carried by the new charging request, and denot it as the sum of new demand currents.

[0120] For example, taking the example in step 205, the new charging request is described as the second charging request received by the central control unit. The new charging request carries the correspondence between the new terminal identifier, the new required voltage, and the new required current as shown in Table 4 above. The new required voltage and current are 20A and 30A, and the sum of the new required current is 50A.

[0121] Step 2062: Divide the new required current into three equal parts.

[0122] Similar to the "average distribution" mentioned in step 204, the average distribution is not an absolute average, but rather a distribution that is as even as possible while satisfying charging needs.

[0123] In this application, each time a new charging request is received and a new charging plan is generated, the charging plan ensures balanced output of the three-phase power. Therefore, when a new charging request is received as described in step 201, the three-phase power supply is already in a balanced charging state, meaning that the output power of each phase is basically the same. Thus, the newly received charging request must still be divided into three equal parts, one for each phase current, to ensure that the three-phase power supply continues to maintain a balanced output state.

[0124] For example, the 50A current is divided into three parts: 20A, 15A, and 15A.

[0125] Step 2063: Establish a third correspondence between each new demand current, AC / DC conversion module identifier, new terminal identifier, and new demand voltage.

[0126] For example, the third correspondence is shown in Table 5 above.

[0127] Step 207: If the idle AC / DC conversion module cannot meet the new charging request, then execute steps 203 and 204.

[0128] Furthermore, it should be noted that the three-phase equalization charging method described in this application is only used as an example for charging electric vehicles. The technical concept of this application can also be applied to power electronic systems related to three-phase equalization scheduling, such as energy storage systems related to electrical energy.

[0129] The three-phase balanced charging power distribution method for charging piles provided in this application determines the number of AC / DC conversion modules to be redistributed, denoted as the first quantity; and determines the demand current to be redistributed, where the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal currently charging; the demand current to be redistributed is divided equally into the first quantity parts; thus, each part of the demand current corresponds to an AC / DC conversion module, achieving the effect of basically evenly distributing the demand current to the three-phase power. Compared with the prior art, when one or more electric vehicles are charging, it is easy to cause phase imbalance at the input end of the charging pile, which causes grid instability and low grid stability; this application evenly distributes the demand current of one or more electric vehicles, making the three-phase power of the charging pile relatively stable, thereby improving the stability of the grid.

[0130] Figure 5 This is a block diagram of a three-phase equalization charging device for a charging pile, as shown in an embodiment of this application. Figure 5 As shown, the device includes:

[0131] The receiving module 501 is used to receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current;

[0132] The first determining module 502 is used to determine whether there is an available AC / DC conversion module;

[0133] The second determining module 503 is used to determine the number of AC / DC conversion modules to be reallocated if none exist, denoted as the first number; and to determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently being charged.

[0134] The first establishment module 504 is used to divide the demand current to be redistributed into a first number of parts, and establish a second correspondence between each part of the demand current and the AC / DC conversion module identifier, terminal identifier, and demand voltage, so that the charging power routing performs power distribution according to the second correspondence.

[0135] Optionally, see Figure 6 The device further includes:

[0136] The third determining module 505 is used to determine whether an available AC / DC converter module can meet a new charging request if there is an available AC / DC converter module.

[0137] The second module 506 is used to establish a third correspondence between the new required current, the AC / DC conversion module identifier, the new terminal identifier, and the new required voltage, if possible.

[0138] Optionally, the second establishment module 506 is further configured to:

[0139] Determine the sum of the new demand currents carried by the new charging request, and denot it as the sum of new demand currents;

[0140] The new required current is divided into three equal parts;

[0141] Establish a third correspondence between each new demand current, AC / DC conversion module identifier, new terminal identifier, and new demand voltage.

[0142] Optionally, the second determining module 503 is further configured to:

[0143] Determine the total number of AC / DC conversion modules, and denote it as the second quantity;

[0144] Determine the third number of terminals that are powered only by a single AC / DC conversion module;

[0145] Determine a first difference between the second quantity and the third quantity, and determine the first difference as the first quantity.

[0146] Optionally, the second establishment module 506 is further configured to:

[0147] If an idle AC / DC converter cannot meet a new charging request, the process described above determines the number of AC / DC converters to be reallocated.

[0148] Additionally, it should be noted that the relevant content in the device embodiment is described in the method embodiment, and will not be repeated here.

[0149] Figure 10 This is a schematic diagram of a charging pile according to an embodiment of this application. The charging pile includes a central processing unit (CPU) 1001, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage portion into a random access memory (RAM) 1003. The RAM 1003 also stores various programs and data required for system operation. The CPU 1001, ROM 1002, and RAM 1003 are interconnected via a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0150] The following components are connected to I / O interface 1005: input section 1006 including touch screen, card reader, emergency stop button, etc.; output section 1007 including cathode ray tube (CRT), liquid crystal display (LCD), etc.; storage section 1008 including hard disk, etc.; and communication section 1009 including network interface card, such as LAN card, modem, etc. Communication section 1009 performs communication processing via a network such as the Internet. Drives are also connected to I / O interface 1005 as needed. Removable media 1011, such as disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1010 as needed so that computer programs read from them can be installed into storage section 1008 as needed.

[0151] In particular, the processes described in the flowcharts of the embodiments of this application can be implemented as computer software programs. For example, the method embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts.

[0152] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to implement the methods described in the embodiments of this application.

[0153] It should be noted that the computer-readable medium shown in this application may be a computer-readable signal medium or a computer-readable storage medium or any combination thereof.

[0154] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself. The described units or modules can also be located in a processor. The names of these units or modules do not necessarily limit the specific unit or module itself.

[0155] In addition, it should be noted that the scope of this application includes feasible technical solutions formed by specific combinations of the above-mentioned technical features, and should also cover other feasible technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept.

[0156] Finally, it should be noted that any content not described in the technical solutions of this application can be implemented using existing technology. Furthermore, the above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for three-phase balanced charging power distribution in a charging pile, characterized in that, include: Receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current; Determine if there are any available AC / DC converter modules; If not, determine the number of AC / DC conversion modules to be reallocated, denoted as the first number; and determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently charging. The required current to be redistributed is divided into a first number of parts, and a second correspondence is established between each part of the required current and the AC / DC conversion module identifier, terminal identifier, and required voltage, so that the charging power routing allocates power according to the second correspondence. After determining whether there is an available AC / DC conversion module, the method further includes: If there are available AC / DC converters, determine whether they can meet the new charging request; If possible, establish a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage; The establishment of a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage includes: Determine the sum of the new demand currents carried by the new charging request, and denot it as the sum of new demand currents; The new required current is divided into three equal parts; Establish a third correspondence between each new demand current, AC / DC conversion module identifier, new terminal identifier, and new demand voltage; Determining the number of AC / DC conversion modules to be reallocated includes: Determine the total number of AC / DC conversion modules, and denote it as the second quantity; Determine the third number of terminals that are powered only by a single AC / DC conversion module; Determine a first difference between the second quantity and the third quantity, and determine the first difference as the first quantity.

2. The three-phase balanced charging power distribution method for charging piles according to claim 1, characterized in that, After determining whether an idle AC / DC converter module can meet a new charging request, the method further includes: If the available AC / DC converters cannot meet the new charging request, then the process of determining the number of AC / DC converters to be reallocated is performed.

3. A three-phase balanced charging power distribution device for a charging pile, characterized in that, include: The receiving module is used to receive a new charging request sent by a new terminal, wherein the new charging request carries a first correspondence between the new terminal identifier, the new required voltage, and the new required current; The first determining module is used to determine whether there is an available AC / DC conversion module; The second determining module is used to determine the number of AC / DC conversion modules to be reallocated if none exist, denoted as the first number; and to determine the demand current to be reallocated, wherein the demand current is the sum of the new demand current and the old demand current, and the old demand current is the demand current of each terminal that is currently being charged. The first establishment module is used to divide the demand current to be redistributed into a first number of parts, and establish a second correspondence between each part of the demand current and the AC / DC conversion module identifier, terminal identifier, and demand voltage, so that the charging power routing performs power distribution according to the second correspondence. The device further includes: The third determining module is used to determine whether an available AC / DC converter can meet a new charging request if there is an available AC / DC converter. The second module is used to establish a third correspondence between the new required current, AC / DC conversion module identifier, new terminal identifier, and new required voltage, if possible. The second establishment module is also used for: Determine the sum of the new demand currents carried by the new charging request, and denot it as the sum of new demand currents; The new required current is divided into three equal parts; Establish a third correspondence between each new demand current, AC / DC conversion module identifier, new terminal identifier, and new demand voltage; The second determining module is also used for: Determine the total number of AC / DC conversion modules, and denote it as the second quantity; Determine the third number of terminals that are powered only by a single AC / DC conversion module; Determine a first difference between the second quantity and the third quantity, and determine the first difference as the first quantity.

4. A computer electronic device, characterized in that, The device includes: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in claim 1 or 2.

5. A computer-readable storage medium, characterized in that, It stores a computer program that is used for: When the computer program is executed by a processor, it implements the method as described in claim 1 or 2.

6. A computer program product comprising a computer program that, when executed by a processor, implements the method as claimed in claim 1 or 2.

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