CN112519624A - Electric automobile charging load studying and judging system - Google Patents

Electric automobile charging load studying and judging system Download PDF

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Publication number
CN112519624A
CN112519624A CN202011302047.5A CN202011302047A CN112519624A CN 112519624 A CN112519624 A CN 112519624A CN 202011302047 A CN202011302047 A CN 202011302047A CN 112519624 A CN112519624 A CN 112519624A
Authority
CN
China
Prior art keywords
charging
data
voltage signal
charging pile
current signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011302047.5A
Other languages
Chinese (zh)
Inventor
张敬雯
司刚
李颖
王敬朋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, State Grid Tianjin Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN202011302047.5A priority Critical patent/CN112519624A/en
Publication of CN112519624A publication Critical patent/CN112519624A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60Monitoring or controlling charging stations
    • B60L53/62Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30Constructional details of charging stations
    • B60L53/31Charging columns specially adapted for electric vehicles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/12Electric charging stations
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles
    • Y02T90/167Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12Remote or cooperative charging

Abstract

The invention discloses a system for studying and judging charging load of an electric automobile, which comprises a plurality of data acquisition units and a data server, wherein: each data acquisition unit is used for acquiring voltage signal and current signal data on a charging loop of each resident personal charging pile in real time and then sending the data to the data server; and the data server is used for storing a charging load characteristic library in advance, wherein the charging load characteristic library comprises preset qualified voltage signal waveforms and current signal waveforms, receiving voltage signal data and current signal data on a charging loop of each resident personal charging pile, processing and forming voltage signal waveforms and current signal waveforms which are changed along with time and are possessed by each resident personal charging pile, comparing the voltage signal waveforms and the current signal waveforms, and judging that suspected default electricity utilization problems exist when the waveform differences are large. The method is suitable for the resident personal charging pile, can quickly and reliably judge whether suspected default power utilization problems exist, and can further enable workers to check and verify the power utilization problems through field inspection.

Description

Electric automobile charging load studying and judging system
Technical Field
The invention relates to the technical field of new energy comprehensive services, in particular to an electric vehicle charging load studying and judging system which is suitable for resident personal charging piles.
Background
With the increase of the market share of electric vehicles, the residential area and the vehicle owner applying for installing the resident personal charging pile are increased day by day, however, since most charging piles are installed outdoors, centralized management cannot be performed, and meanwhile, since the electricity price of the resident personal charging pile is lower than the commercial electricity price (for example, the electricity price of the charging pile is 0.51 yuan/degree, which is lower than the commercial electricity price), there is a case that other electric loads of other properties are privately connected for other purposes (such as merchants), so that the risk of default electricity utilization exists.
To current power consumption information acquisition system, can monitor only that the smart meter steals electric, but can't monitor whether more than exist the behavior of using electricity of breaching.
Disclosure of Invention
The invention aims to provide a system for studying and judging the charging load of an electric automobile, aiming at the technical defects in the prior art.
Therefore, the invention provides a system for studying and judging the charging load of an electric automobile, which comprises a plurality of data acquisition units and a data server, wherein:
each data acquisition unit is installed on a charging loop of each resident personal charging pile, is used for acquiring voltage signal and current signal data on the installed charging loop of each resident personal charging pile in real time, and then sends the data to the data server;
and the data server is connected with each data acquisition unit through a signal line and is used for storing a charging load characteristic library in advance, the charging load characteristic library comprises preset qualified voltage signal waveforms and current signal waveforms, the data server is used for receiving voltage signal data and current signal data on a charging loop of each resident personal charging pile in real time and processing the voltage signal waveforms and the current signal waveforms which are formed on each resident personal charging pile and change along with time, then the voltage signal waveforms and the current signal waveforms are respectively compared with the preset qualified voltage signal waveforms and the current signal waveforms, and when the waveform difference obtained by comparison is large, the suspected default electricity utilization problem is judged.
Wherein, the waveform difference of comparing each other before and after is great, specifically is: the voltage amplitude of the voltage signal waveform which changes along with time and is possessed by the resident personal charging pile is smaller than the amplitude of the voltage signal waveform which is qualified in the presetting, and the smaller proportion is larger than the presetting proportion.
Wherein, the waveform difference of comparing each other before and after is great, specifically is: the voltage amplitude of the current signal waveform which changes along with time and is possessed by the resident personal charging pile is larger than the amplitude of the preset qualified current signal waveform, and the excess proportion is larger than the preset proportion.
Wherein, a current transformer and a voltage transformer are installed on a connecting line between the data acquisition unit and a charging loop of the resident personal charging pile.
The charging loop of each resident individual charging pile is connected with the transformer through a bus special for the charging pile;
and an alternating current contactor is arranged on a power supply loop of each resident individual charging pile.
Compared with the prior art, the charging load studying and judging system for the electric automobile is suitable for the resident individual charging pile, the voltage signal data and the current signal data on the charging loop of the resident individual charging pile are collected in real time by the data collecting unit, then the voltage signal waveform and the current signal waveform which change along with time are formed by processing of the data server, and then the voltage signal waveform and the current signal waveform are compared with the pre-stored charging load characteristic library, the charging load characteristic library comprises the preset qualified voltage signal waveform and the current signal waveform, and when the waveform difference of the current comparison and the later comparison is large, the suspected default electricity utilization problem is judged, so that workers can further pass field inspection and verification, and the charging load studying and judging system has important practical application significance.
Drawings
Fig. 1 is a block diagram of an embodiment of a system for studying and determining a charging load of an electric vehicle according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the invention provides an electric vehicle charging load studying and judging system, which is suitable for a resident personal charging pile, and comprises a plurality of data acquisition units and a data server, wherein:
each data acquisition unit is installed on a charging loop (namely a charging load) of a resident personal charging pile, is used for acquiring voltage signal and current signal data on the installed charging loop of the resident personal charging pile in real time and then sending the data to a data server;
a data server connected with each data acquisition unit through a signal line and used for pre-storing a charging load characteristic library, the charging load feature library comprises preset qualified voltage signal waveforms and current signal waveforms (voltage signal waveforms and current signal waveforms which change along with time), and is used for receiving the voltage signal and the current signal data on the charging loop of each resident personal charging pile in real time, and processes and forms a voltage signal waveform and a current signal waveform which each resident's personal charging post has over time, then comparing with the preset qualified voltage signal waveform and current signal waveform, when the waveform difference between the current and the later compared waveforms is large, then the suspected default electricity utilization problem (namely the situation that other property electricity loads are privately connected for other purposes) exists, and at this time, the staff can be further verified through field inspection.
It should be noted that each resident charging pile is connected to a bus bar dedicated to the charging pile through a charging controller, and the bus bar dedicated to the charging pile is connected to a station transformer (i.e., a cell distribution transformer). The station transformer (i.e., the cell distribution transformer) also needs to be responsible for the residential life electricity. Charging controller and resident's individual charging pile are the battery charging outfit that current electric automobile used, for prior art, do not give unnecessary details here.
In the present invention, in terms of specific implementation, the waveform difference between the front and the back compared with each other is large, and specifically, the waveform difference may be: the voltage amplitude of the voltage signal waveform which changes along with time and is possessed by the resident personal charging pile is smaller than the amplitude of the preset qualified voltage signal waveform, and the smaller proportion is larger than the preset proportion (for example, 10%); at this time, when the electric load is connected privately, there is a behavior of privately connecting electricity in series with the charging circuit of the resident individual charging pile.
For example, when the standard charging voltage (i.e., the amplitude of the voltage signal waveform that is qualified by the preset) of the ac charging post is 220V, if the preset proportion is 10%, the voltage amplitude of the voltage signal waveform that the resident's personal charging post has with time is less than 200V.
In the present invention, in terms of specific implementation, the waveform difference between the front and the back compared with each other is large, and specifically, the waveform difference may be: the voltage amplitude of the current signal waveform which changes along with time and is possessed by the resident personal charging pile is larger than the amplitude of the preset qualified current signal waveform, and the over proportion is larger than the preset proportion (for example, 10%); at this time, when the private power load is connected, there is a private power connection behavior in parallel with both ends of the charging circuit of the resident individual charging pile.
For example, when the standard charging voltage (i.e., the amplitude of the voltage signal waveform that is qualified by the preset) of the ac charging post is 220V, if the preset proportion is 10%, the voltage amplitude of the voltage signal waveform that the resident's personal charging post has with time is less than 200V. This is achieved by
For example, when the standard charging current (i.e., the amplitude of the current signal waveform that is qualified by the presetting) of the ac charging post is 15A, if the presetting proportion is 10%, the resident's personal charging post has a current amplitude of the current signal waveform that changes with time greater than 16.5A.
In the invention, a current transformer and a voltage transformer are installed on a connecting line between the data acquisition unit and a charging loop of the resident personal charging pile.
In the invention, in particular, a charging loop of each resident individual charging pile is connected with a transformer (a transformer with a transformer load control unit) through a bus special for the charging pile;
and an alternating current contactor is arranged on a power supply loop of each resident individual charging pile and used for controlling the on-off action of the charging loop of each resident individual charging pile.
It should be noted that, for the present invention, a data acquisition unit is installed at the charging load (i.e. the charging loop of the resident charging post), and acquires the data such as the current and voltage of the charging load in real time, and transmits the data to the data server and the raspberry embedded processor on the data server, through data extraction and integration, real-time current and voltage waveforms (current signal waveform and voltage signal waveform changing along with time) are formed and compared with a charging load characteristic library prestored in a system, if the waveform difference is large, the electricity consumption is suspected to be violated, after the verification and the confirmation on site, a cut-off signal (through the alternating current contactor) can be triggered through manual intervention, the alternating current contactor is controlled to be disconnected, therefore, the charging loop is disconnected, the default electricity utilization behavior is stopped, and after the rectification is finished, the alternating current contactor can be controlled to be closed to continue the charging behavior.
In the concrete implementation, a mutual inductor is additionally arranged on a charging loop (namely a power supply loop comprising a power supply voltage line and a load current line) of each resident personal charging pile.
In the concrete implementation, each state node is wired (wired, wireless or carrier communication), and data is acquired and accessed to a data server.
In the present invention, in a specific implementation, the data acquisition unit is an existing data acquisition unit, for example, a data acquisition unit of model 16 manufactured by baoding Yuxin electrical technology limited may be adopted, and the data acquisition unit may acquire 16-way analog quantity and 8-way input quantity simultaneously, and has an IRIGB code timing and an Ethernet interface.
For the invention, the data acquisition unit is used for acquiring voltage signal and current signal data on the charging loop of each resident personal charging pile in real time.
In the invention, in concrete implementation, the data server can adopt the existing data server, for example, the data server with the model number YX-SE-20 produced by the Baoding Yuxin electric technology limited company can be adopted, the whole data server adopts a compact design and is suitable for being installed in a narrow space, and the installation bars at the bottom and the side surface of the box body can be conveniently installed at any position; the data server adopts a firm and durable steel structure box body and a shockproof driver frame design, so that the data server can bear the impact and vibration of an industrial field.
For the invention, the data server is used for a pre-stored charging load characteristic library, the charging load characteristic library comprises preset qualified voltage signal waveforms and current signal waveforms, voltage signal data and current signal data on a charging loop of each resident personal charging pile are received, and the voltage signal waveforms and the current signal waveforms which are changed along with time and are possessed by each resident personal charging pile are processed and formed.
It should be noted that, for the invention, a set of electric vehicle charging load research and judgment system is developed by mainly adopting a data acquisition unit and a data server of the Baoding Yuxin electrical equipment company and utilizing a raspberry type embedded module based on a non-invasive load identification technology, and the purpose is to reduce the risks of electricity default and electricity stealing.
Through practical tests, the system can accurately study and judge the property of the charging load, reduces the default power utilization risk to zero, and ensures good power utilization environment and power utilization management of the electric automobile.
In summary, compared with the prior art, the invention provides a system for studying and judging the charging load of the electric vehicle, which utilizes a data acquisition unit to acquire voltage signal data and current signal data on a charging loop of a resident personal charging pile in real time, then a data server processes the data to form voltage signal waveforms and current signal waveforms which change along with time, and then the voltage signal waveforms and the current signal waveforms are compared with a pre-stored charging load characteristic library, wherein the charging load characteristic library comprises preset qualified voltage signal waveforms and current signal waveforms, and when the current waveforms compared with each other later are different greatly, the suspected default electricity utilization problem is judged, so that workers can further pass field inspection and verification, and the system has important practical application significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides an electric automobile loads of charging studies and judges system which characterized in that, includes a plurality of data acquisition units and data server, wherein:
each data acquisition unit is installed on a charging loop of each resident personal charging pile, is used for acquiring voltage signal and current signal data on the installed charging loop of each resident personal charging pile in real time, and then sends the data to the data server;
and the data server is connected with each data acquisition unit through a signal line and is used for storing a charging load characteristic library in advance, the charging load characteristic library comprises preset qualified voltage signal waveforms and current signal waveforms, the data server is used for receiving voltage signal data and current signal data on a charging loop of each resident personal charging pile in real time and processing the voltage signal waveforms and the current signal waveforms which are formed on each resident personal charging pile and change along with time, then the voltage signal waveforms and the current signal waveforms are respectively compared with the preset qualified voltage signal waveforms and the current signal waveforms, and when the waveform difference obtained by comparison is large, the suspected default electricity utilization problem is judged.
2. The system of claim 1, wherein the waveform differences between the previous and subsequent comparison are large, specifically: the voltage amplitude of the voltage signal waveform which changes along with time and is possessed by the resident personal charging pile is smaller than the amplitude of the voltage signal waveform which is qualified in the presetting, and the smaller proportion is larger than the presetting proportion.
3. The system of claim 1, wherein the waveform differences between the previous and subsequent comparison are large, specifically: the voltage amplitude of the current signal waveform which changes along with time and is possessed by the resident personal charging pile is larger than the amplitude of the preset qualified current signal waveform, and the excess proportion is larger than the preset proportion.
4. The system for studying and judging the charging load of the electric vehicle as claimed in any one of claims 1 to 3, wherein a current transformer and a voltage transformer are installed on a connection line between the data acquisition unit and the charging loop of the resident personal charging post.
5. The system for studying and judging the charging load of the electric vehicle as claimed in any one of claims 1 to 3, wherein the charging loop of each residential personal charging pile is connected to the transformer through a bus dedicated to the charging pile;
and an alternating current contactor is arranged on a power supply loop of each resident individual charging pile.
CN202011302047.5A 2020-11-19 2020-11-19 Electric automobile charging load studying and judging system Pending CN112519624A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150183333A1 (en) * 2014-01-02 2015-07-02 Causam Energy, Inc. Systems and methods for electric vehicle charging and user interface therefor
US20160214535A1 (en) * 2011-04-22 2016-07-28 Angel A. Penilla Vehicle contact detect notification system and cloud services system for interfacing with vehicle
CN109532545A (en) * 2019-01-08 2019-03-29 唐山智通仪表技术有限公司 A kind of electric motor intelligent charging pile
CN109934473A (en) * 2019-02-28 2019-06-25 深圳智链物联科技有限公司 Charge health index methods of marking, device, terminal device and storage medium
CN111002859A (en) * 2019-12-11 2020-04-14 深圳猛犸电动科技有限公司 Method and device for identifying private patch board of charging pile, terminal equipment and storage medium
CN111027741A (en) * 2019-10-28 2020-04-17 国网天津市电力公司电力科学研究院 Method for constructing space-time dimension-oriented generalized load model analysis library
CN111290304A (en) * 2020-03-11 2020-06-16 上海电器科学研究所(集团)有限公司 Charging system evidence data acquisition platform between electric automobile and charging pile

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160214535A1 (en) * 2011-04-22 2016-07-28 Angel A. Penilla Vehicle contact detect notification system and cloud services system for interfacing with vehicle
US20150183333A1 (en) * 2014-01-02 2015-07-02 Causam Energy, Inc. Systems and methods for electric vehicle charging and user interface therefor
CN109532545A (en) * 2019-01-08 2019-03-29 唐山智通仪表技术有限公司 A kind of electric motor intelligent charging pile
CN109934473A (en) * 2019-02-28 2019-06-25 深圳智链物联科技有限公司 Charge health index methods of marking, device, terminal device and storage medium
CN111027741A (en) * 2019-10-28 2020-04-17 国网天津市电力公司电力科学研究院 Method for constructing space-time dimension-oriented generalized load model analysis library
CN111002859A (en) * 2019-12-11 2020-04-14 深圳猛犸电动科技有限公司 Method and device for identifying private patch board of charging pile, terminal equipment and storage medium
CN111290304A (en) * 2020-03-11 2020-06-16 上海电器科学研究所(集团)有限公司 Charging system evidence data acquisition platform between electric automobile and charging pile

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