CN108340805B - Alternating-current charging pile and power distribution method thereof - Google Patents
Alternating-current charging pile and power distribution method thereof Download PDFInfo
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- CN108340805B CN108340805B CN201810259751.3A CN201810259751A CN108340805B CN 108340805 B CN108340805 B CN 108340805B CN 201810259751 A CN201810259751 A CN 201810259751A CN 108340805 B CN108340805 B CN 108340805B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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- H02J7/0027—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention relates to an alternating current charging pile and a power distribution method thereof, wherein the alternating current charging pile comprises: the charging system comprises a plurality of charging guns with different power levels, a control module connected with the charging guns, and a power distribution module in communication connection with the control module, wherein the power distribution module is used for acquiring the state of each charging gun from the control module, determining the output current of each online charging gun by combining the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset distribution strategy, and sending the output current of the corresponding charging gun to the control module; and the control module is used for determining the duty ratio of the PWM signal of the corresponding charging gun according to the received output current and outputting the PWM signal with the corresponding duty ratio to the electric automobile connected with the corresponding charging gun. By implementing the technical scheme of the invention, one pile can be filled more.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to an alternating-current charging pile and a power distribution method thereof.
Background
The alternating-current charging is a charging mode which is beneficial to prolonging the service life of the battery of the electric automobile, is a relatively good charging mode for the property of a district or an owner of the automobile with a fixed parking space, and meets the actual use requirements of users in view of charging cost and service life of the battery especially in a time period when the users do not need emergency charging.
The traditional alternating-current charging piles are one pile and one charge, after the charging requirement of one electric automobile is met, the charging requirement of more electric automobiles cannot be met, and under the background that the national policy is to push the cell to build the charging piles, how to build an alternating-current group charging system in a residential area or a parking space dense area by utilizing limited power resources (wiring resources) is a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an alternating current charging pile and a power distribution method thereof.
The technical scheme adopted for solving the technical problems is as follows: an ac charging stake is constructed, comprising: a plurality of charging guns with different power levels, a control module connected with the charging guns, and a power distribution module in communication connection with the control module,
the power distribution module is used for acquiring the state of each charging gun from the control module, combining the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset distribution strategy, determining the output current of each online charging gun, and sending the output current of the corresponding charging gun to the control module;
the control module is used for acquiring the state of the corresponding charging gun and sending the state to the power distribution module; and the device is also used for determining the duty ratio of the PWM signal of the corresponding charging gun according to the received output current and outputting the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun.
Preferably, the charging gun comprises three single-phase alternating-current charging guns of a first power level and one three-phase alternating-current charging gun of a second power level, wherein the second power level is greater than the first power level.
Preferably, the single phase ac charging gun of the first power class is a 7kw single phase ac charging gun and the three phase ac charging gun of the second power class is a 40kw three phase ac charging gun.
Preferably, the preset allocation policy is a priority allocation policy, and the charging gun with low power level has a higher priority than the charging gun with high power level.
Preferably, the power distribution module includes:
the communication unit is used for receiving the state and the maximum output power of each charging gun from the control module and sending the output current of the corresponding charging gun to the control module; and the system is also used for receiving the maximum power allowed by the current system and the maximum current allowed by the current system from the centralized control equipment;
the power determining unit is used for determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy;
the current calculation unit is used for determining the maximum output current of each online charging gun according to the output power of each online charging gun;
and the current determining unit is used for determining the output current of the online charging gun according to the maximum output current of the online charging gun, the maximum current allowed by the current system and a preset distribution strategy.
Preferably, the number of the control modules is one; or alternatively, the process may be performed,
the number of the control modules is multiple, and each control module is correspondingly connected with a charging gun.
The invention also constructs a power distribution method of the alternating current charging pile, which comprises the following steps:
s10, acquiring the state of each charging gun from a control module, wherein an alternating-current charging pile comprises: a plurality of charging guns with different power levels and a control module connected with the charging guns;
s20, determining the output current of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset allocation strategy;
s30, sending output current of the corresponding charging gun to the control module, so that the control module determines the duty ratio of the PWM signal of the corresponding charging gun according to the received output current, and outputting the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun.
Preferably, the step S20 includes the steps of:
s21, determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy;
s22, determining the maximum output current of the corresponding charging gun according to the output power of each online charging gun;
s23, determining the output current of the corresponding charging gun according to the maximum output current of the corresponding charging gun, the maximum current allowed by the current system and a preset distribution strategy.
Preferably, when the charging gun includes three single-phase ac charging guns of 7kw and one three-phase ac charging gun of 40kw, the step S21 includes the steps of:
s211, if only 40kw of three-phase alternating current charging guns are in an on-line state, determining the output power of the 40kw of three-phase alternating current charging guns according to a formula 1.1:
s212, if the three-phase alternating current charging gun with the power of 40kw is in an off-line state and at least one single-phase alternating current charging gun with the power of 7kw is in an on-line state, determining the output power of each on-line single-phase alternating current charging gun with the power of 7kw according to a formula 1.2:
s213, if the three-phase alternating current charging gun with the power of 40kw is in an on-line state and at least one single-phase alternating current charging gun with the power of 7kw is in an on-line state, distributing power to the single-phase alternating current charging guns with the power of 7kw on-line preferentially, and specifically determining the output power of each on-line charging gun according to the formula 1.3 and the formula 1.4:
also, p20#max=p11#max b+p12#max c+p13#max D,
P00#max＝P10#max+P20#max，
wherein P10#max is the maximum output power of a 40kw three-phase alternating current charging gun, P11#max, P12#max and P13#max are the maximum output power of three 7kw single-phase alternating current charging guns, pmax is the maximum power allowed by the current system, P10#is the output power of a 40kw three-phase alternating current charging gun, P20#is the output power of a 7kw single-phase alternating current charging gun on line, B, C, D is the state values of three 7kw single-phase alternating current charging guns, and 1 time represents on-line and 0 time represents off-line.
Preferably, the step S23 includes the steps of:
s231, if only the three-phase alternating current charging gun with the power of 40kw is in an on-line state, determining the output current of the three-phase alternating current charging gun with the power of 40kw according to a formula 2.1:
s232, if the three-phase alternating current charging gun with the power of 40kw is in an off-line state and at least one single-phase alternating current charging gun with the power of 7kw is in an on-line state, determining the output current of each on-line single-phase alternating current charging gun with the power of 7kw according to a formula 2.2:
s213, if the three-phase alternating current charging gun with the power of 40kw is in an on-line state and at least one single-phase alternating current charging gun with the power of 7kw is in an on-line state, determining the output current of each on-line charging gun according to the formulas 2.3 and 2.4:
further, i00#max=i10#max a+i20#max E,
wherein i10#max is the maximum output current of the 40kw three-phase alternating current charging gun, i20#max is the maximum output current of the on-line 7kw single-phase alternating current charging gun, imax is the maximum current allowed by the current system, i10#is the output current of the 40kw three-phase alternating current charging gun, i20# is the output current of the on-line 7kw single-phase alternating current charging gun, a is the state value of the 40kw three-phase alternating current charging gun, a is on-line in 1 epoch, a is off-line in 0 epoch, and e=1 if b+c+d is equal to or greater than 1; if b+c+d=0, e=0.
By implementing the technical scheme of the invention, one pile can be used for realizing multi-charging, and the states of a plurality of charging guns, the output capacities of power and current can be analyzed and calculated, and the power output value and the current output value distributed by each charging gun can be finally determined, so that the requirement of simultaneously charging a plurality of electric vehicles in a residential area or a parking space dense area can be realized by utilizing limited power resources and wiring resources.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a logical block diagram of a first embodiment of an AC charging stake of the present invention;
FIG. 2 is a logical block diagram of a second embodiment of an AC charging stake of the present invention;
FIG. 3 is a flow chart of a first embodiment of a power distribution method for an AC charging stake according to the present invention;
FIG. 4 is a flowchart of a first embodiment of step S20 in FIG. 3;
fig. 5 is a flowchart of a second embodiment of a power distribution method of an ac charging pile according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a logical block diagram of an embodiment of an ac charging stake of the present invention, the ac charging stake including: the power distribution module 30, a plurality of charging guns 11, 12, …, 1N and the control module 20, wherein the control module 20 is connected with the charging guns 11, 12, …, 1N, and the power distribution module 30 is in communication connection with the control module 20. Among the plurality of charging guns 11, 12, …, 1N, at least two types of charging guns of different power classes are included, and the power input ends of the charging guns are also connected with alternating current through cables of corresponding power classes. In addition, the power distribution module 30 is configured to obtain the status of each charging gun 11, 12, …, 1N from the control module 20, where the status includes online or offline, and determine the output current of each online charging gun in combination with the maximum output power of each charging gun 11, 12, …, 1N, the maximum power allowed by the current system, the maximum current allowed by the current system, and a preset distribution policy, and send the output current of the corresponding charging gun to the control module 20. The control module 20 is configured to obtain a state of a corresponding charging gun, and send the state to the power distribution module 30; and the device is also used for determining the duty ratio of the PWM signal of the corresponding charging gun according to the received output current and outputting the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun.
The alternating current charging pile of the embodiment can realize one pile with multiple charges, and can analyze and calculate the on-line/off-line states of a plurality of charging guns and the output capacities of power and current, and finally determine the current output value distributed by each charging gun, so that the requirement of simultaneously charging a plurality of electric vehicles in a residential area or a parking space dense area can be realized by utilizing limited electric power resources and wiring resources.
With respect to the control module 20, in an alternative embodiment, the control module 20 is an integrated control module and is simultaneously connected to the plurality of charging guns 11, 12, …, 1N, which saves space and cost. In another alternative embodiment, the control module 20 may be a plurality of discrete control modules, and each control module is correspondingly connected to a charging gun, so that the control modules and the charging guns corresponding to the control modules can be integrated together, which is convenient for assembly and maintenance in practical application.
In a specific embodiment, the preset allocation policy is a priority allocation policy, and the charging gun with a low power level has a higher priority than the charging gun with a high power level.
In one embodiment, in combination with the logic structure diagram of a second embodiment of the ac charging stake of the present invention as illustrated in fig. 2, the ac charging stake of the present embodiment includes: the power distribution module 30, the four charging guns 10, 11, 12, 13 and the four control modules 21, 22, 23, 24, wherein the four control modules 21, 22, 23, 24 are in one-to-one correspondence connection with the four charging guns 10, 11, 12, 13, and the power distribution module 30 is in communication connection with the four control modules 21, 22, 23, 24 through a CAN bus. Also, it is preferable that the ac charging stake is provided at a central position of four parking spaces arranged in a field shape, so that four charging guns can charge electric vehicles on four parking spaces around the ac charging stake at the same time, and long wiring is not required.
In this embodiment, the system power supply line is a three-phase five-wire system, and the five wires are three phase wires (L1, L2, L3), a neutral wire (N), and a ground wire (PE), respectively. The four charging guns 10, 11, 12, 13 include: three 7KW single-phase ac charging guns and one 40KW three-phase ac charging gun, and, in view of three-phase balance, the live power input end of the 7KW single-phase ac charging gun 11 is connected to the L1 phase line, the live power input end of the 7KW single-phase ac charging gun 12 is connected to the L2 phase line, the live power input end of the 7KW single-phase ac charging gun 13 is connected to the L3 phase line, and the three live power input ends of the 40KW three-phase ac charging gun 10 are respectively connected to the L1, L2, and L3 phase lines, and the cables are all configured in accordance with the 40KW power cable standard. This configuration of the ac charging stake of this embodiment ensures that even when three single phase ac charging stakes 11, 12, 13 are turned on simultaneously, the three phase ac charging stake 10 is still guaranteed to charge at about 20kw of power, with the four charging guns charging at a relatively even rate.
It should be noted that the above is only a preferred embodiment, and of course, in other embodiments, other configurations may be selected when designing the ac charging pile, for example, selecting other numbers of charging guns or charging guns of other power levels. According to the power requirement of the charging gun in the national standard, the charging gun can be selected from the following: 2.2kw of single-phase ac charging guns, 3.5kw of single-phase ac charging guns, 7kw of single-phase ac charging guns, 11kw of three-phase ac charging guns, 22kw of three-phase ac charging guns, 40kw of three-phase ac charging guns, and the like. For example, when the number of charging guns is four, the four charging guns may be three single-phase ac charging guns of a first power level and one three-phase ac charging gun of a second power level, where the second power level is greater than the first power level, and the live power input ends of the three single-phase ac charging guns are respectively connected to the three-phase live wires, and the three live power input ends of the three-phase ac charging guns are respectively connected to the three-phase live wires. In one specific example, the ac charging stake is configured with 3 single-phase ac charging guns of 7kw and 1 three-phase ac charging gun of 22 kw. In one specific example, the ac charging stake is configured with 3 single-phase ac charging guns of 3.5kw and 1 three-phase ac charging gun of 40 kw. In one specific example, the ac charging stake is configured with 3 single phase ac charging guns of 3.5kw and 1 three phase ac charging gun of 22 kw.
In addition, in one particular embodiment, the power distribution module 30 includes a communication unit, a power determination unit, a current calculation unit, and a current determination unit. Wherein:
the communication unit is, for example, a CAN communication unit, and may be communicatively connected to a centralized control device (not shown) and a plurality of control modules via a CAN bus for data interaction, specifically: receiving the state (online or offline) and the maximum output power (rated power), rated current of each charging gun from a plurality of control modules; the output current of the charging gun is sent to a control module corresponding to the online charging gun; receiving the maximum power allowed by the current system and the maximum current allowed by the current system from the centralized control equipment; and sending the running load of the online charging gun to the centralized control equipment.
In addition, the power determining unit is used for determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy. The current calculation unit is used for determining the maximum output current of each online charging gun according to the output power of each online charging gun. The current determining unit is used for determining the output current of the online charging gun according to the maximum output current of the online charging gun, the maximum current allowed by the current system and a preset distribution strategy.
Fig. 3 is a flowchart of a first embodiment of a power distribution method of an ac charging pile according to the present invention, the power distribution method of the embodiment including the steps of:
s10, acquiring the state of each charging gun from a control module, wherein an alternating-current charging pile comprises: a plurality of charging guns with different power levels and a control module connected with the charging guns;
s20, determining the output current of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset allocation strategy;
s30, sending output current of the corresponding charging gun to the control module, so that the control module determines the duty ratio of the PWM signal of the corresponding charging gun according to the received output current, and outputting the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun.
Further, with reference to fig. 4, step S20 includes the steps of:
s21, determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy;
s22, determining the maximum output current of the corresponding charging gun according to the output power of each online charging gun;
s23, determining the output current of the corresponding charging gun according to the maximum output current of the corresponding charging gun, the maximum current allowed by the current system and a preset distribution strategy.
Fig. 5 is a flowchart of a second embodiment of the power distribution method of the ac charging stake of the present invention, in which the charging gun includes three 7kw single-phase ac charging guns and one 40kw three-phase ac charging gun, and, in conjunction with fig. 2, the following settings are made: p10#max is the maximum output power of the 40kw three-phase ac charging gun 10, p11#max, p12#max, p13#max are the maximum output powers of the three 7kw single-phase ac charging guns 11, 12, 13, respectively, pmax is the maximum power allowed by the current system, p10#is the output power of the 40kw three-phase ac charging gun 10, p20#is the output power of the 7kw single-phase ac charging gun on line, A, B, C, D is the state values of the charging guns 10, 11, 12, 13, respectively, A, B, C, D is on line in 1 era, A, B, C, D is off line in 0 era. I10#max is the maximum output current of the three-phase ac charging gun 10 of 40kw, i20#max is the maximum output current of the on-line 7kw single-phase ac charging gun, imax is the maximum current allowed by the current system, i10#is the output current of the three-phase ac charging gun 10 of 40kw, i20#is the output current of the on-line 7kw single-phase ac charging gun, Δp is the surplus distribution power, and Δi is the surplus distribution current. In addition, set up: if b+c+d is equal to or greater than 1, e=1, and if b+c+d=0, e=0. F=a+b+c+d, i.e. F represents the number of charging guns on line. P20#max=p11#max×b+p12#max×c+p13#max×d, p00#max=p10#max+p20#max. I00#max=i10#max×a+i20#max×e.
In this embodiment, when the ac charging pile starts to operate, first, pmax and Imax are obtained, and it is to be noted that if the ac charging pile is set in a parking area of a cell, a market, or the like, and electricity is taken from a transformer system of the cell or the market, the step may obtain Pmax and Imax from a centralized control device of the cell, where Pmax is a power value obtained by subtracting the current power of the cell or the market from the rated power of the cell transformer, and Imax is a current value obtained by subtracting the current power of the cell or the market from the rated current of the cell transformer; if the ac charging stake is provided at an independent charging station, the Pmax, imax may be fixed values stored in advance.
Then, the states of the respective charging guns 10, 11, 12, 13, that is, the values of A, B, C, D are obtained by CAN communication with the respective control modules, and the maximum output power values (that is, rated power values) p10#max, p11#max, p12#max, p13#max of the respective charging guns 10, 11, 12, 13 are also obtained, and here, p10#max, p11#max, p12#max, p13#max may be written in advance in the power distribution module.
Then, calculating the value of F according to the obtained value of A, B, C, D, judging whether F is equal to 0, if so, indicating that the charging gun is not on line currently, and further keeping a standby state; if not, further judging which of the following three working conditions is:
for the first operating mode: a=1, e=0, representing that only 40kw of the three-phase ac charging gun 10 is in an on-line state, and the other three 7kw of the single-phase ac charging guns 11, 12, 13 are all in an off-line state, at which time, in step S211, the output power of the 40kw of the three-phase ac charging gun 10 can be determined according to equation 1.1:
when p10#max is equal to or greater than Pmax, Δp=0; when p10#max < Pmax, Δp=pmax—p10#max.
For the second operating mode: a=0, e=1, representing that the three-phase ac charging gun 10 of 40kw is off-line and at least one single-phase ac charging gun of 7kw is on-line, at which time the output power of each on-line single-phase ac charging gun of 7kw may be determined according to equation 1.2 in step S212:
when p20#max is equal to or greater than Pmax, Δp=0;
when p20#max < Pmax, Δp=pmax—p20#max.
For the third operating mode: a=1, e=1, representing that the three-phase ac charging gun 10 of 40kw is in an on-line state, and at least one single-phase ac charging gun of 7kw is in an on-line state, since the three-phase ac charging gun of 40kw can use up resources at one time, the priority of the single-phase ac charging gun of 7kw is higher, when the single-phase ac charging gun of 7kw is on-line, the three-phase ac charging gun 10 of 40kw needs to be used with reduced power, and when the single-phase ac charging gun of 7kw is off-line, the three-phase ac charging gun 10 of 40kw is used again with rated power, so that at this time, power can be preferentially allocated to the single-phase ac charging gun of 7kw on-line in step S213, specifically, the output power of each on-line charging gun is determined according to the formula 1.3 and the formula 1.4:
when p20#max is equal to or greater than Pmax, Δp=0; when p20#max < Pmax < p00#max, Δp=0; when Pmax is equal to or greater than p00#max, Δp=pmax—p00#max.
And then, calculating the corresponding maximum output current according to the output power corresponding to the online charging gun. Taking a star-star junction method as an example, for single-phase equipment, the calculation formula of the power of the single-phase equipment is p=u×i×cos θ; for a three-phase device, the power calculation formula is p=3×u×i×cos θ, where U is a phase voltage, I is a phase current (in the star connection, the line current is equal to the phase current), and cos θ is a power factor, and is generally taken to be 0.85. Therefore, in calculating the output current, the following calculation can be made according to the above formula:
I10#max＝P10#/U/3/cosθ，
I20#max＝P20#/U/cosθ。
then, the determination process of the output current under three working conditions is described respectively:
for the first operating mode: a=1, e=0, and in step S231, the output current of the 40kw three-phase ac charging gun 10 may be determined according to the formula 2.1:
when i10#max is equal to or greater than Imax, Δi=0; when i10#max < Imax, Δi=imax—i10#max.
For the second operating mode: a=0, e=1, and the output current of each online 7kw single-phase ac charging gun can be determined according to equation 2.2 in step S232:
when i20#max is equal to or greater than Imax, Δi=0; when i20#max < Imax, Δi=imax—i20#max.
For the third operating mode: a=1, e=1, and in step S233, the output current of each online charging gun can be determined according to the formula 2.3 and the formula 2.4:
when i20#max is equal to or greater than Imax, Δi=0; Δi=0 when i20#max < Imax < I00#max; when I max is equal to or greater than I00# max, Δi=i max-I00# max.
And finally, sending the calculated output current to a corresponding control module. And after receiving the output current, the control module determines the duty ratio of the PWM signal of the corresponding charging gun according to the received output current, and outputs the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun.
The above disclosure is illustrative of the preferred embodiments of the present invention and, of course, should not be taken as limiting the scope of the invention, and those skilled in the art will recognize that all or part of the procedures described above can be performed without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. An ac charging stake, comprising: a plurality of charging guns with different power levels, a control module connected with the charging guns, and a power distribution module in communication connection with the control module,
the power distribution module is used for acquiring the state of each charging gun from the control module, combining the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset distribution strategy, determining the output current of each online charging gun, and sending the output current of the corresponding charging gun to the control module;
the power distribution module includes: the power determining unit is used for determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy, wherein the state of the charging gun is an online state or an offline state;
the current calculation unit is used for determining the maximum output current of each online charging gun according to the output power of each online charging gun;
the current determining unit is used for determining the output current of the online charging gun according to the maximum output current of the online charging gun, the maximum current allowed by the current system and a preset distribution strategy;
the control module is used for acquiring the state of the corresponding charging gun and sending the state to the power distribution module; the device is also used for determining the duty ratio of the PWM signal of the corresponding charging gun according to the received output current and outputting the PWM signal of the corresponding duty ratio to the electric automobile connected with the corresponding charging gun;
the charging gun comprises three single-phase alternating-current charging guns with first power levels and one three-phase alternating-current charging gun with second power levels, wherein the second power levels are larger than the first power levels;
the power distribution module is specifically configured to: if only the three-phase ac charging gun of the second power class is in an on-line state, determining the output power of the three-phase ac charging gun of the second power class according to equation 1.1:
if the three-phase ac charging guns of the second power class are off-line and the single-phase ac charging guns of the at least one first power class are on-line, determining the output power of each on-line single-phase ac charging gun of the first power class according to equation 1.2:
if the three-phase ac charging gun of the second power level is in an on-line state and the single-phase ac charging gun of the at least one first power level is in an on-line state, preferentially distributing power to the single-phase ac charging guns of the first power level on-line, specifically, determining the output power of each on-line charging gun according to the formulas 1.3 and 1.4:
also, p20#max=p11#max b+p12#max c+p13#max D,
P00#max＝P10#max+P20#max，
wherein p10#max is the maximum output power of the three-phase ac charging gun of the second power level, p11#max, p12#max, p13#max are the maximum output power of the single-phase ac charging gun of the three first power levels, pmax is the maximum power allowed by the current system, p10# is the output power of the three-phase ac charging gun of the second power level, p20# is the output power of the single-phase ac charging gun of the first power level on line, B, C, D is the state value of the single-phase ac charging gun of the three first power levels, and 1 time represents on line, and 0 time represents off line.
2. The ac charging stake of claim 1, wherein the single phase ac charging gun of the first power level is a 7kw single phase ac charging gun and the three phase ac charging gun of the second power level is a 40kw three phase ac charging gun.
3. The ac charging stake of claim 1 or 2, wherein the power distribution module further includes:
the communication unit is used for receiving the state and the maximum output power of each charging gun from the control module and sending the output current of the corresponding charging gun to the control module; and is also used for receiving the maximum power allowed by the current system and the maximum current allowed by the current system from the centralized control equipment.
4. The ac charging stake of claim 3, wherein the number of control modules is one; or alternatively, the process may be performed,
the number of the control modules is multiple, and each control module is correspondingly connected with a charging gun.
5. A method of distributing power to an ac charging pile, comprising the steps of:
s10, acquiring the state of each charging gun from a control module, wherein an alternating-current charging pile comprises: the charging guns are in an on-line state or an off-line state;
s20, determining the output current of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system, the maximum current allowed by the current system and a preset allocation strategy;
s30, sending output current of a corresponding charging gun to the control module, so that the control module determines the duty ratio of a PWM signal of the corresponding charging gun according to the received output current, and outputting the PWM signal of the corresponding duty ratio to an electric automobile connected with the corresponding charging gun;
wherein, the step S20 includes the following steps:
s21, determining the output power of each online charging gun according to the state of each charging gun, the maximum output power of each charging gun, the maximum power allowed by the current system and a preset distribution strategy;
s22, determining the maximum output current of the corresponding charging gun according to the output power of each online charging gun;
s23, determining the output current of the corresponding charging gun according to the maximum output current of the corresponding charging gun, the maximum current allowed by the current system and a preset allocation strategy;
wherein, when the charging gun includes three single-phase ac charging guns of a first power level and a three-phase ac charging gun of a second power level, and the second power level is greater than the first power level, the step S21 includes the steps of:
s211, if only the three-phase alternating current charging gun with the second power level is in an on-line state, determining the output power of the three-phase alternating current charging gun with the second power level according to a formula 1.1:
s212, if the three-phase alternating current charging gun with the second power level is in an off-line state and the single-phase alternating current charging gun with at least one first power level is in an on-line state, determining the output power of the single-phase alternating current charging gun with each on-line first power level according to a formula 1.2:
s213, if the three-phase alternating current charging gun with the second power level is in an on-line state and the single-phase alternating current charging gun with at least one first power level is in an on-line state, distributing power to the single-phase alternating current charging gun with the first power level on-line preferentially, and specifically determining the output power of each on-line charging gun according to the formula 1.3 and the formula 1.4:
also, p20#max=p11#max b+p12#max c+p13#max D,
P00#max＝P10#max+P20#max，
wherein p10#max is the maximum output power of the three-phase ac charging gun of the second power level, p11#max, p12#max, p13#max are the maximum output power of the single-phase ac charging gun of the three first power levels, pmax is the maximum power allowed by the current system, p10# is the output power of the three-phase ac charging gun of the second power level, p20# is the output power of the single-phase ac charging gun of the first power level on line, B, C, D is the state value of the single-phase ac charging gun of the three first power levels, and 1 time represents on line, and 0 time represents off line.
6. The power allocation method according to claim 5, wherein said step S23 comprises the steps of:
s231, if only the three-phase alternating current charging gun with the second power level is in an on-line state, determining the output current of the three-phase alternating current charging gun with the second power level according to a formula 2.1:
s232, if the three-phase alternating current charging gun with the second power level is in an off-line state and at least one single-phase alternating current charging gun with the first power level is in an on-line state, determining the output current of each on-line single-phase alternating current charging gun with the first power level according to a formula 2.2:
s213, if the three-phase alternating current charging gun with the second power level is in an on-line state and the single-phase alternating current charging gun with at least one first power level is in an on-line state, determining the output current of each on-line charging gun according to the formulas 2.3 and 2.4:
further, i00#max=i10#max a+i20#max E,
wherein i10#max is the maximum output current of the three-phase ac charging gun of the second power level, i20#max is the maximum output current of the single-phase ac charging gun of the first power level on line, imax is the maximum current allowed by the current system, i10#is the output current of the three-phase ac charging gun of the second power level, i20#is the output current of the single-phase ac charging gun of the first power level on line, a is the state value of the three-phase ac charging gun of the second power level, a is online in 1 time, a is offline in 0 time, and e=1 if b+c+d is equal to or greater than 1; if b+c+d=0, e=0.
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| CN110816357B (en) * | 2019-10-30 | 2021-04-13 | 恒大智慧充电科技有限公司 | Charging method, computer device and storage medium |
| CN113315183A (en) | 2020-02-27 | 2021-08-27 | 台达电子企业管理（上海）有限公司 | Charging pile, power distribution system and power distribution method thereof |
| CN111864872B (en) * | 2020-07-28 | 2023-08-29 | 深圳英驱新能源有限公司 | Readable storage medium, charging module and power distribution method thereof |
| CN112193096B (en) * | 2020-09-24 | 2022-01-28 | 洛阳光法电气科技有限公司 | Distributed charging management system and management method for electric vehicle |
| GB2621139A (en) * | 2022-08-02 | 2024-02-07 | 3Ti Energy Hubs Ltd | A controller |
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