CN110797882B - Direct current charging station and control method thereof - Google Patents

Direct current charging station and control method thereof Download PDF

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Publication number
CN110797882B
CN110797882B CN201911093893.8A CN201911093893A CN110797882B CN 110797882 B CN110797882 B CN 110797882B CN 201911093893 A CN201911093893 A CN 201911093893A CN 110797882 B CN110797882 B CN 110797882B
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charging
current
compensation current
charging pile
output
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CN110797882A (en
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王新宇
陶磊
邹海晏
张�杰
吴云
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The direct current charging station at least comprises a composite charging pile with a reactive compensation function, at least comprises a basic charging pile without the reactive compensation function and a harmonic current compensation function, and a system controller, wherein the system controller is used for controlling a target composite charging pile to output reactive compensation current. According to the direct current charging station, the composite charging pile with the reactive compensation function is arranged, a reactive compensation device and a harmonic current compensation device do not need to be arranged independently, and the composite charging pile and the basic charging pile are arranged in a mixed mode, so that the overall construction cost and the operation and maintenance cost of the direct current charging station are reduced.

Description

Direct current charging station and control method thereof
Technical Field
The invention relates to the technical field of direct current power supply, in particular to a direct current charging station and a control method thereof.
Background
A dc charging station often is provided with many dc charging stake, fills electric pile through the dc and for the object of charging, for example electric automobile, carries out quick charge. In the operation process of the direct current charging station, reactive compensation needs to be carried out on the direct current charging station, so that efficient operation of related equipment such as a direct current charging pile in the direct current charging station is guaranteed, and meanwhile, the influence of the direct current charging station on the power factor of a public power grid connected with the direct current charging station is reduced.
In the prior art, reactive power compensation is mostly realized by providing an independent reactive power compensation device in a dc charging station, for example, using an SVG (Static Var Generator) to perform reactive power compensation on the dc charging station.
However, the use of a separate reactive power compensation device will undoubtedly increase the overall construction cost and operation and maintenance cost of the dc charging station.
Disclosure of Invention
The invention provides a direct current charging station and a control method thereof.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present invention provides a dc charging station, comprising: at least one hybrid charging pile, at least one basic charging pile, and a system controller,
the composite charging pile has a reactive compensation function;
the basic charging pile does not have a reactive compensation function and a harmonic current compensation function;
the system controller is at least used for controlling target compound type charging piles to output reactive compensation current, and the target compound type charging piles are one or more of the compound type charging piles.
Optionally, the dc charging station provided in the first aspect of the present invention further includes: the detection device is used for detecting the input current and the input voltage of the direct current charging station and sending the input current and the input voltage to the system controller;
and the system controller is used for controlling the target composite charging pile to output reactive compensation current according to the input current and the input voltage.
Optionally, the system controller is configured to obtain a reactive output instruction including a reactive compensation current value, and control the target composite charging pile to output a reactive compensation current according to the reactive output instruction.
Optionally, the composite charging pile further has a harmonic current compensation function;
and the system controller is also used for controlling the target composite charging pile to output harmonic compensation current according to the input current.
Optionally, the charging module of the composite charging pile is one of an AC/DC charging module based on a T-type three-level rectifier, an AC/DC charging module based on an I-type NPC rectifier, an AC/DC charging module based on an ANPC rectifier, and an AC/DC charging module based on a flying capacitor rectifier.
Optionally, the basic charging pile adopts one of an AC/DC charging module based on a T-type Vienna rectifier and an AC/DC charging module based on an I-type Vienna rectifier.
Optionally, the system controller is further configured to control the basic charging pile and/or the compound charging pile to output a charging current.
Optionally, the dc charging station according to any one of the first aspect of the present invention further includes: a transformer, wherein,
the input end of the transformer is connected with a power supply, and the output end of the transformer is respectively connected with the power supply input ends of the basic charging piles and the compound charging piles.
In a second aspect, the present invention provides a method for controlling a dc charging station, which is applied to a system controller in the dc charging station according to any one of the first aspect of the present invention, and includes:
acquiring a reactive compensation current value of the direct current charging station;
determining a target composite charging pile according to a preset screening rule; the target composite charging piles are one or more of the composite charging piles;
and controlling the target composite charging pile to output reactive compensation current based on the reactive compensation current value.
Optionally, the obtaining of the reactive compensation current value of the dc charging station includes:
acquiring a reactive output instruction;
and analyzing the reactive output instruction to obtain a reactive compensation current value.
Optionally, if the dc charging station includes a detection device, the obtaining of the reactive compensation current value of the dc charging station includes:
acquiring input current and input voltage of the direct current charging station;
and calculating to obtain the reactive compensation current value of the direct current charging station according to the input current and the input voltage.
Optionally, the method for controlling a dc charging station according to the second aspect of the present invention further includes:
calculating to obtain a harmonic compensation current value of the direct current charging station according to the input current;
and controlling the target composite charging pile to output a harmonic compensation current based on the harmonic compensation current value.
Optionally, the controlling the target composite charging pile to output reactive compensation current based on the reactive compensation current value includes:
distributing the reactive compensation current values according to a first preset distribution rule to obtain reactive compensation current values corresponding to the target composite charging piles;
and controlling each target composite charging pile to output reactive compensation current according to the corresponding reactive compensation current value.
Optionally, the controlling the target composite charging pile to output a harmonic compensation current based on the harmonic compensation current value includes:
if the harmonic compensation current value is larger than a preset threshold value, distributing the reactive compensation current value according to a second preset distribution rule to obtain a harmonic compensation current value corresponding to each target composite charging pile;
and controlling each target composite charging pile to output a harmonic compensation current according to the corresponding harmonic compensation current value.
Optionally, the method for controlling a dc charging station according to any one of the second aspect of the present invention further includes:
and controlling each composite charging pile and/or each basic charging pile to output charging current.
The direct current charging station at least comprises a composite charging pile with a reactive compensation function, at least comprises a basic charging pile without the reactive compensation function and a harmonic current compensation function, and a system controller, wherein the system controller is used for controlling a target composite charging pile to output reactive compensation current. According to the direct current charging station, reactive compensation current is provided through the composite charging pile with the reactive compensation function, a reactive compensation device does not need to be arranged independently, operation and maintenance tasks can be simplified, operation and maintenance cost is reduced, meanwhile, the composite charging pile and the basic charging pile are arranged in a mixed mode, and the overall construction cost of the direct current charging station is lower than that of the reactive compensation device and the harmonic current compensation device which are arranged independently.
Furthermore, the composite charging pile and the basic charging pile have the same volume, but the direct current charging station provided by the invention is not provided with an independent reactive power compensation device and an independent harmonic compensation device, so that the construction land of the direct current charging station can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a dc charging station according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an AC/DC charging module based on a T-type three-level rectifier according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an ANPC rectifier based AC/DC charging module according to an embodiment of the present invention;
fig. 4 is a block diagram of another dc charging station according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method of a dc charging station according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Optionally, referring to fig. 1, fig. 1 is a block diagram of a dc charging station according to an embodiment of the present invention. The embodiment of the invention provides a direct current charging station, which comprises: at least one hybrid charging pile 10, at least one base type charging pile 20, and a system controller 30. It should be noted that, in the embodiment shown in fig. 1, one composite charging pile 10 and one basic charging pile 20 are shown, which only serve to simplify the illustration content and facilitate description of the dc charging station provided in the embodiment of the present invention, and are not used to limit the number of composite charging piles and basic charging piles.
Specifically, as shown in fig. 1, a power input end of the hybrid charging pile 10 is connected to a power source 40 (shown by a solid line in the figure), and the hybrid charging pile 10 has a reactive compensation function and can output a reactive compensation current according to a control command of the system controller 30. Of course, it is conceivable that the hybrid charging pile 10 has a reactive power compensation function and a charging current output function, and can charge the charging target when necessary.
Optionally, the composite charging pile 10 may select any one of an AC/DC charging module based on a T-type three-level rectifier as shown in fig. 2, an AC/DC charging module based on an ANPC rectifier as shown in fig. 3, and of course, an AC/DC charging module based on an I-type NPC rectifier and an AC/DC charging module based on a flying capacitor rectifier. The various types of charging modules can ensure that the composite charging pile 10 has a reactive power compensation function.
Accordingly, the power input terminal of the basic charging pile 20 is also connected to the power source 40 (shown by a solid line in the figure), and the basic charging pile 20 does not have the reactive compensation function and the harmonic current compensation function, and can only output the charging current according to the control command of the system controller 30 to charge the charging object.
Optionally, the basic charging pile 20 may adopt any one of an AC/DC charging module based on a T-type Vienna rectifier and an AC/DC charging module based on an I-type Vienna rectifier.
Based on the above, it is conceivable that both the composite charging pile 10 and the basic charging pile 20 have the function of outputting the charging current, and compared with the basic charging pile 20, the composite charging pile 10 further has the function of outputting the reactive compensation current, so that the composite charging pile 10 is higher than the basic charging pile 20 in terms of the production cost of a single unit, which is one of the reasons why the composite charging pile and the basic charging pile are simultaneously installed in the dc charging station provided by the embodiment of the present invention.
The system controller 30 is used for controlling the target composite charging pile 10 to output reactive compensation current so as to replace the function of SVG equipment in the prior art and realize reactive compensation of a connected power supply network. Further, a charging current output control function can be integrated into the system controller 30 provided in the embodiment of the present invention, that is, the system controller 30 controls the composite charging pile 10 and the basic charging pile 20 to output the charging current according to the connection condition of the charging object, specifically, when the composite charging pile 10 is connected to the charging object, the corresponding composite charging pile 10 is controlled to charge the charging object; when the basic charging pile 20 is connected with the charging object, the corresponding basic charging pile 20 is controlled to charge the charging object.
In summary, according to the dc charging station provided by the embodiment of the present invention, the reactive compensation current is provided through the composite charging pile with the reactive compensation function, and a reactive compensation device does not need to be separately arranged, so that the operation and maintenance task can be simplified, and the operation and maintenance cost can be reduced. Meanwhile, considering that the manufacturing cost of the composite charging pile is higher than that of the basic charging pile, the direct-current charging station provided by the embodiment of the invention mixes the composite charging pile and the basic charging pile, and the overall construction cost of the direct-current charging station can be lower than that of a reactive power compensation device which is independently arranged.
Furthermore, the composite charging pile and the basic charging pile are the same in size, but an independent reactive power compensation device is not arranged in the direct current charging station provided by the embodiment of the invention, so that the construction land of the direct current charging station can be saved.
Optionally, the system controller 30 may control the hybrid charging pile 10 to output the reactive compensation current in two ways. First, the system controller 30 may control the reactive compensation current output from the composite charging pile according to a control command input from the outside. Specifically, the system controller 30 can perform high-speed real-time communication with each of the composite charging piles 10, and after a reactive output instruction including a reactive compensation current value is acquired, the system controller 30 sends the obtained reactive output instruction to the corresponding target composite charging pile through the high-speed real-time communication so as to control the corresponding target composite charging pile to output the reactive compensation current.
And secondly, a detection device is arranged in the direct current charging station, the input current and the input voltage of the direct current charging station are fed back to a system controller through the detection device, the system controller calculates the reactive compensation current value required to be output by the direct current charging station in real time according to the obtained input voltage and input current, and the output reactive compensation current of the target composite charging pile is controlled according to the reactive compensation current value.
Optionally, referring to fig. 4, fig. 4 is a block diagram of another dc charging station according to an embodiment of the present invention, and on the basis of the embodiment shown in fig. 1, the dc charging station further includes: the detection device 50 is configured to, among other things,
the detection device 50 is configured to detect an input current and an input voltage of the dc charging station, and transmit the detected input current and input voltage to the system controller 30. As shown, the connection between the detection device 50 and the dc charging station detection point, and the information transmission relationship between the detection device and the system controller 30 are shown by dotted lines.
Alternatively, for the detection of the input current of the dc charging station, when the power supply 40 does not supply power to other load devices other than the dc charging station, the output current of the power supply 40 may be directly detected, and the output current of the power supply 40 may be used as the input current of the dc charging station. Accordingly, the output voltage of the power source 40 can be used as the input voltage of the dc charging station on the premise that the voltage drop generated from the power source 40 to the dc charging station is within the allowable range. Of course, the detection points of the detection device 50 may be set in the dc charging station, so as to more accurately obtain the total input current and the total input voltage of the dc charging station. Any setting mode capable of accurately acquiring the total input current and the total input voltage of the direct current charging station is optional, and the setting mode also belongs to the protection scope of the invention on the premise of not exceeding the core thought scope of the invention.
The system controller 30 controls the target composite charging pile 10 to output the reactive compensation current according to the input current and the input voltage of the direct current charging station fed back by the detection device 50, that is, the system controller 30 calculates according to a preset algorithm based on the input current and the input voltage fed back by the detection device 50, generates a control instruction according with the current working condition of the direct current charging station, and controls the target composite charging pile to output the reactive compensation current.
Further, the composite charging pile 10 can also have a harmonic current compensation function on the basis of having a reactive compensation function. In this case, the system controller 30 may further calculate a harmonic compensation current that the dc charging station needs to output, based on the input current of the dc charging station fed back by the detection device 50, and control the target hybrid charging pile 10 to output the harmonic compensation current, if necessary.
Therefore, the target hybrid charging pile 10 can output the reactive compensation current, the harmonic compensation current, or both the reactive compensation current and the harmonic compensation current according to the control instruction of the system controller 30.
Of course, under the condition that the dc charging station does not need to output the reactive compensation current and the harmonic compensation current, the system controller 30 provided in the embodiment of the present invention may also control the target composite charging pile to stop outputting the reactive compensation current or the harmonic compensation current, or stop outputting the reactive compensation current and the harmonic compensation current at the same time.
It is conceivable that, due to the difference between the input current and the input voltage of the dc charging station, the reactive compensation current value and the harmonic compensation current value that the dc charging station needs to output are also different, and thus the number of the composite charging piles that need to output the reactive compensation current and the harmonic compensation current changes, and therefore, the target composite charging pile mentioned in any of the above embodiments of the present invention refers to one or more of all the composite charging piles included in the dc charging station.
Further, in the dc charging station provided in the embodiment shown in fig. 4, a transformer 60 is further provided. The input end of the transformer 60 is connected to the power source 40, and the output end of the transformer 60 is connected to the power input ends of the basic charging pile 20 and the composite charging pile 10, respectively, for converting the output voltage and the output current of the power source 40. In the embodiment of the present invention, when the detection device 50 detects the input current and the input voltage of the dc charging station, the detection point may be set at the output end of the transformer 60.
According to the direct current charging station provided by the embodiment of the invention, the transformer is additionally arranged on the basis of the direct current charging station shown in fig. 1, so that the direct current charging station can be ensured to obtain more stable electric energy supply, meanwhile, the electromagnetic isolation with a power supply is realized to a certain extent, and the mutual influence between the direct current charging station and the power supply in the working process is reduced. Harmonic current compensation can be carried out, a harmonic current compensation device independently arranged in the prior art is replaced, and the construction cost and the operation and maintenance cost of the direct current charging station are further reduced.
It should be noted that, in any of the above embodiments, whether it is a hybrid charging pile or a basic charging pile, it is possible to output a corresponding charging current only when a charging object is connected to the charging interface, and it is not possible to output a charging current when no charging object is connected. However, for the composite charging pile, even if the charging interface is not connected with a charging object, the system controller can also control the composite charging pile to output corresponding reactive compensation current and harmonic compensation current or simultaneously output the reactive compensation current and the harmonic compensation current according to needs. For example, in practical application, the user chooses for use the basic type to fill electric pile for electric automobile charging, and the basic type fills electric pile output charging current, and the compound type fills electric pile can not output charging current because do not connect the object of charging, but whole direct current charging station still need output reactive compensation current, and under this kind of circumstances, system controller can control the compound type of target of choosing and fill electric pile output reactive compensation current.
Optionally, as described above, the dc charging station provided in the embodiment of the present invention is provided with the composite charging pile and the basic charging pile at the same time, but in practical application, a reactive compensation capacity required by one dc charging station is relatively limited, for example, a reactive compensation capacity of 10% of a total capacity is provided, so that the set number of the composite charging pile and the basic charging pile can be matched according to a ratio of the reactive compensation capacity to an active capacity of the dc charging station, so as to further reduce the overall construction cost of the dc charging station and the later operation and maintenance cost while meeting the basic reactive compensation capacity.
A control method of a dc charging station according to an embodiment of the present invention is described below, and the control method of a dc charging station according to an embodiment of the present invention is applied to a system controller of a dc charging station according to any one of the embodiments described above.
Optionally, referring to fig. 5, fig. 5 is a flowchart of a control method of a dc charging station according to an embodiment of the present invention, where the flowchart may include:
and S100, obtaining a reactive compensation current value of the direct current charging station.
In order to realize control of the composite charging pile, a system controller of the direct current charging station first needs to acquire a reactive compensation current value to be output by the direct current charging station.
Optionally, the system controller may receive an external reactive output instruction, where the reactive output instruction includes a reactive compensation current value of the dc charging station, and after receiving the reactive output instruction, the system controller analyzes the reactive output instruction to obtain the reactive compensation current value included therein.
Optionally, if the dc charging station is provided with a detection device, the system controller is connected to the detection device of the dc charging station, in this case, the system controller may further obtain the input current and the input voltage of the dc charging station through the detection device.
After the input current and the input voltage of the direct current charging station are obtained, the system controller can calculate the reactive compensation current value required to be provided by the direct current charging station according to the obtained input current and the input voltage. It is conceivable that the reactive compensation current value calculated here is relative to the dc charging station, and the reactive compensation current specifically output by each composite charging pile needs to be further determined in the subsequent step.
As described above, if the hybrid charging pile in the dc charging station further has a harmonic current compensation function, the system controller further needs to calculate a harmonic compensation current value that needs to be output by the dc charging station according to a preset algorithm. Specifically, in the process of calculating the reactive compensation current value of the direct current charging station, the input current and the input voltage of the direct current charging station need to be combined, and for the calculation of the harmonic compensation current value of the direct current charging station, the input current of the direct current charging station only needs to be combined to calculate the harmonic compensation current value. As for the specific calculation process of the reactive compensation current and the harmonic compensation current, the calculation process can be realized by referring to the calculation method in the prior art, the present invention is not particularly limited to this, and any calculation method in the prior art that can calculate the reactive compensation current value and the harmonic compensation current value of the dc charging station according to the input current and the input voltage of the dc charging station is also optional.
As for the data transmission mode and the data transmission process between the system controller and the detection device, the implementation mode in the prior art can be referred to, and the present invention is not particularly limited to this.
And S110, determining the target composite charging pile according to a preset screening rule.
The target composite charging pile in the embodiment of the invention is one or more of all composite charging piles of a direct current charging station.
Optionally, there may be multiple ways to select the target composite charging pile. For example, the historical time length of reactive compensation current output or harmonic compensation current output of each composite charging pile can be counted, the composite charging piles are sorted according to the historical time length, and then the composite charging piles are selected as target composite charging piles according to the sequence of the historical time lengths from short to long.
Or setting corresponding state identification for each composite charging pile, marking the state of each composite charging pile, and screening the composite charging piles which have not output reactive compensation current or harmonic compensation current as target composite charging piles according to the state identification of each composite charging pile. And when all the compound charging piles in the direct-current charging station output reactive compensation current or harmonic compensation current, updating the state identifications of all the compound charging piles in the direct-current charging station so as to select the compound charging piles at the next time.
Or, the system controller may determine whether each of the composite charging piles is connected to a charging object, and preferentially select a target composite charging pile from the composite charging piles connected to the charging object.
It should be noted that, for the case that the system controller controls the composite charging pile to output the reactive compensation current according to the received reactive output instruction, more control information may be added to the reactive output instruction. For example, a composite charging pile specifically executing the reactive output instruction may be specified, and after the system controller obtains the reactive output instruction of this type, it is not necessary to determine a target composite charging pile according to the preset screening rule, and it is only necessary to directly control a corresponding composite charging pile to output reactive compensation current according to the obtained reactive output instruction.
Further, the reactive power output instruction can further specify the reactive power current value and the like specifically output by each target composite charging pile.
It is conceivable that no matter what kind of preset screening rule is adopted to screen the target composite charging pile, a precondition must be satisfied, that is, the selected target composite charging pile can output the reactive compensation current value of the dc charging station obtained in S100, and an overload phenomenon does not occur.
It should be noted that other manners for obtaining the target composite charging pile through screening are also optional, and the present invention also belongs to the protection scope of the present invention without departing from the scope of the core idea of the present invention.
And S120, controlling the working state of the target composite charging pile based on the reactive compensation current value.
After the reactive compensation current required to be output by the direct-current charging station and the target composite charging pile are determined, the obtained reactive compensation current value needs to be distributed according to a first preset distribution rule to obtain a reactive compensation current value corresponding to each target composite charging pile.
Optionally, as the simplest distribution mode, the reactive compensation current value required to be output by the direct-current charging station can be evenly distributed to each target composite charging pile; and reactive compensation current values required to be output by the direct-current charging stations can be distributed to the target composite charging piles in proportion according to a preset distribution proportion. Of course, the allocation may be performed in other allocation manners, and the allocation is also within the protection scope of the present invention without departing from the scope of the core idea of the present invention.
After the reactive compensation current value corresponding to each target composite charging pile is determined, each target composite charging pile can be controlled to output reactive compensation current according to the corresponding reactive compensation current value.
In summary, the dc charging station control method provided in the embodiments of the present invention controls the dc charging station having both the composite charging pile and the basic charging pile, so that the composite charging pile can provide reactive compensation current without separately providing a reactive compensation device, thereby simplifying operation and maintenance tasks and reducing operation and maintenance costs.
Optionally, for the harmonic compensation current, after the harmonic compensation current value of the dc charging station is calculated according to the input current of the dc charging station, it is first determined whether the harmonic compensation current value is greater than a preset threshold value, for example, 5% of the total current, if the harmonic compensation current value of the dc charging station is greater than the preset threshold value, similar to the reactive current compensation mode, the harmonic compensation current value obtained by calculation needs to be distributed according to a second preset distribution rule, so as to obtain the harmonic compensation current value corresponding to each target composite charging pile, and then each target composite charging pile is controlled to output the harmonic compensation current according to the corresponding harmonic compensation current value.
Optionally, for the second preset allocation rule, the same allocation manner as the first preset allocation rule may be selected, and of course, an allocation manner different from the first preset allocation rule may also be selected.
Correspondingly, if the calculated harmonic compensation current value is smaller than or equal to the preset threshold value, the harmonic current compensation can be temporarily not performed, and the system controller directly prohibits each target composite charging pile from outputting the harmonic compensation current.
Therefore, for the composite charging pile with the reactive current compensation function and the harmonic current compensation function, the control method provided by the embodiment of the invention can control the target composite charging pile to output the reactive compensation current and the harmonic compensation current or simultaneously output the reactive compensation current and the harmonic compensation current. Certainly, for the composite charging pile which is not selected as the target composite charging pile, the reactive compensation current and the harmonic compensation current are not output.
Optionally, the control method provided in the embodiment of the present invention may further control the composite charging pile and the basic charging pile according to a specific condition that the dc charging station is connected to the charging object, or simultaneously control the composite charging pile and the basic charging pile to charge the charging object, that is, output the charging current.
Furthermore, when the direct current charging station is controlled to perform reactive current compensation and harmonic current compensation, one or more target compound charging piles can be appointed to execute corresponding functions, so that when the number of the charging piles which are actually connected with charging objects in the direct current charging station is reduced, reactive compensation current which needs to be output by the direct current charging station can be reduced.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A direct current charging station, comprising: at least one hybrid charging pile, at least one basic charging pile, and a system controller,
the composite charging pile has a reactive compensation function and a harmonic current compensation function, wherein the volume of the composite charging pile is the same as that of a basic charging pile, so that the construction area of the direct current charging station is saved;
the basic charging pile does not have a reactive compensation function and a harmonic current compensation function;
the system controller is at least used for controlling a target composite charging pile to output reactive compensation current and/or harmonic compensation current, wherein the target composite charging pile is one or more of the composite charging piles;
the system controller is further used for controlling the target composite charging pile to output reactive compensation current and/or harmonic compensation current according to actual needs when a charging interface of the target composite charging pile is not connected with a charging object.
2. The direct current charging station of claim 1, further comprising: a detection device, wherein,
the detection device is used for detecting the input current and the input voltage of the direct current charging station and sending the input current and the input voltage to the system controller;
and the system controller is used for controlling the target composite charging pile to output reactive compensation current according to the input current and the input voltage.
3. The dc charging station according to claim 1, wherein the system controller is configured to obtain a reactive output command including a reactive compensation current value, and control the target hybrid charging pile to output a reactive compensation current according to the reactive output command.
4. The DC charging station of claim 2, wherein the system controller controls the target hybrid charging pile to output a harmonic compensation current according to the input current.
5. The direct current charging station of claim 1, wherein the charging module of the hybrid charging post is one of a T-type three-level rectifier based AC/DC charging module, an I-type NPC rectifier based AC/DC charging module, an ANPC rectifier based AC/DC charging module, and a flying capacitor rectifier based AC/DC charging module.
6. The direct current charging station of claim 1, wherein the base charging post employs one of a T-type Vienna rectifier based AC/DC charging module and an I-type Vienna rectifier based AC/DC charging module.
7. The direct current charging station according to any one of claims 1 to 6, wherein the system controller is further configured to control the base charging pile and/or the hybrid charging pile to output a charging current.
8. The direct current charging station according to any one of claims 1 to 6, further comprising: a transformer, wherein,
the input end of the transformer is connected with a power supply, and the output end of the transformer is respectively connected with the power supply input ends of the basic charging piles and the compound charging piles.
9. A method for controlling a dc charging station, the method being applied to a system controller in the dc charging station according to any one of claims 1 to 8, the method comprising:
acquiring a reactive compensation current value and a harmonic compensation current value of the direct current charging station;
determining a target composite charging pile according to a preset screening rule; the target composite charging piles are one or more of the composite charging piles;
controlling the target composite charging pile to output reactive compensation current based on the reactive compensation current value;
and controlling the target composite charging pile to output the harmonic compensation current based on the harmonic compensation current value.
10. The method according to claim 9, wherein the obtaining the reactive compensation current value of the dc charging station includes:
acquiring a reactive output instruction;
and analyzing the reactive output instruction to obtain a reactive compensation current value.
11. The method of claim 9, wherein if the dc charging station includes a detection device, the obtaining the value of the reactive compensation current of the dc charging station comprises:
acquiring input current and input voltage of the direct current charging station;
and calculating to obtain the reactive compensation current value of the direct current charging station according to the input current and the input voltage.
12. The method of controlling a dc charging station according to claim 11, further comprising:
and calculating to obtain the harmonic compensation current value of the direct current charging station according to the input current.
13. The method according to claim 9, wherein the controlling the target hybrid charging pile to output a reactive compensation current based on the reactive compensation current value includes:
distributing the reactive compensation current values according to a first preset distribution rule to obtain reactive compensation current values corresponding to the target composite charging piles;
and controlling each target composite charging pile to output reactive compensation current according to the corresponding reactive compensation current value.
14. The method of claim 12, wherein the controlling the target hybrid charging post to output a harmonic compensation current based on the harmonic compensation current value comprises:
if the harmonic compensation current value is larger than a preset threshold value, distributing the reactive compensation current value according to a second preset distribution rule to obtain a harmonic compensation current value corresponding to each target composite charging pile;
and controlling each target composite charging pile to output harmonic compensation current according to the corresponding harmonic compensation current value.
15. The method for controlling a dc charging station according to any one of claims 9 to 14, further comprising:
and controlling each composite charging pile and/or each basic charging pile to output charging current.
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