WO2022052105A1 - Système et procédé d'échantillonnage pour modules photovoltaïques - Google Patents

Système et procédé d'échantillonnage pour modules photovoltaïques Download PDF

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Publication number
WO2022052105A1
WO2022052105A1 PCT/CN2020/115076 CN2020115076W WO2022052105A1 WO 2022052105 A1 WO2022052105 A1 WO 2022052105A1 CN 2020115076 W CN2020115076 W CN 2020115076W WO 2022052105 A1 WO2022052105 A1 WO 2022052105A1
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WIPO (PCT)
Prior art keywords
current
data
sampling
processing device
photovoltaic module
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PCT/CN2020/115076
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English (en)
Chinese (zh)
Inventor
孔宇航
俞石洪
刘懿莹
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华北电力大学扬中智能电气研究中心
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Publication of WO2022052105A1 publication Critical patent/WO2022052105A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present disclosure relates to the technical field of photovoltaic power generation, and in particular, to a current sampling system and method for photovoltaic components.
  • photovoltaic power generation technology With the popularization of photovoltaic power generation technology, the performance requirements of photovoltaic modules are gradually increasing. In order to improve the electrical energy obtained by photovoltaic power generation, multiple photovoltaic modules are usually combined and connected.
  • the specific implementation is to configure and install photovoltaic smart junction boxes for each photovoltaic module. , so that the photovoltaic modules can be connected through the photovoltaic intelligent junction box.
  • people determine the operation of each photovoltaic module by sampling each photovoltaic module.
  • a photovoltaic smart junction box is usually used to measure the output index of a photovoltaic module.
  • the photovoltaic smart junction box usually uses resistance sampling to sample and detect the current of the associated photovoltaic module, and determine the The voltage drop across the resistor is used to determine the current output by the corresponding photovoltaic module, and the relationship refers to that the photovoltaic smart junction box is installed on the photovoltaic module and the photovoltaic module is sampled.
  • Embodiments of the present invention provide a current sampling system and method for a photovoltaic module, so as to solve the problem in the prior art that the current generated by the photovoltaic module cannot be safely measured without loss.
  • a current sampling system for photovoltaic modules including:
  • a current transformer sampling current data in a current link, and transmitting the current data associated with the current link to an access gateway, wherein the current link includes at least one photovoltaic module connected in series;
  • Access the gateway receive the current data in the respective associated current links collected by at least one current transformer, use the collected current data as the current measurement value of each photovoltaic module on the associated current link, and use the obtained The current data is reported to the processing device;
  • the processing device receives and records the current data corresponding to the current link reported by each access gateway, marks the time stamp corresponding to the current data, and stores the marked current data.
  • the current sampling system further includes an intelligent junction box, and the intelligent junction box is used for:
  • the operation data of the photovoltaic module is collected, and the operation data is reported to the access gateway, wherein the operation data includes voltage data and temperature data of the photovoltaic module.
  • the access gateway is further used for:
  • processing device is further used for:
  • sampling data of each photovoltaic module sent by the access gateway is received, a corresponding timestamp is marked corresponding to each sampling data, and the marked sampling data is stored.
  • the processing device further includes:
  • processing device is further used for:
  • the photovoltaic modules whose temperature data in the sampling data exceeds the preset temperature threshold value are screened out, and the selected photovoltaic modules are regarded as abnormal photovoltaic modules, and corresponding abnormal information is displayed.
  • the deployment positions of the access gateway and the current transformer are not fixed, and the access gateway is connected to at least one current transformer through an extensible interface, and receives current data sampled by the at least one current transformer.
  • a current sampling method for photovoltaic modules including:
  • Each of the obtained current data is reported to the processing device, so that the processing device can receive the timestamp corresponding to the current data mark and store the marked current data.
  • an electronic device comprising:
  • a processor configured to read and execute executable instructions stored in the memory, so as to receive current data collected by at least one current transformer in the respective associated current links, and use the collected current data as the The current measurement value of each photovoltaic module on the associated current link; the obtained current data is reported to the processing device, so that the processing device can receive the timestamp corresponding to the current data mark and store the marked current data .
  • a computer-readable storage medium which, when an instruction in the computer-readable storage medium is executed by an electronic device, enables the electronic device to perform the above method.
  • the current sampling system of the photovoltaic module includes a current transformer, an access gateway, and a processing device, and the current transformer is used for sampling current data in the current link, and transmitting the current data associated with the current link to an access gateway, wherein the current link includes at least one photovoltaic module connected in series;
  • the access gateway is configured to receive at least one current mutual inductance the current data in the respective associated current links collected by the device, take the collected current data as the current measurement value of each photovoltaic module on the associated current link, and report the obtained current data to the processing device;
  • the processing device is configured to receive and record the current data corresponding to the current link reported by each access gateway, mark a timestamp corresponding to the current data, and store the marked current data.
  • the one-time sampling of the current link through the current transformer replaces the traditional method of measuring the current of photovoltaic modules, and realizes non-destructive testing without affecting the original circuit, which greatly reduces the power loss of current sampling.
  • the sampling efficiency and sampling accuracy of the current are improved, the measurement circuit is simplified, the measurement cost is reduced, and the power consumption is greatly reduced.
  • FIG. 1 is a schematic diagram of the composition of a current sampling system of a photovoltaic module in an embodiment of the disclosure
  • FIG. 2 is a schematic diagram of a current link in an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a current transformer in an embodiment of the present disclosure.
  • FIG. 4 is a schematic flowchart of a current sampling method for a photovoltaic module according to an embodiment of the disclosure
  • FIG. 5 is a schematic diagram of an entity structure of an access gateway in an embodiment of the present disclosure.
  • the present disclosure proposes a current sampling system for photovoltaic modules, which does not require current sampling in a smart junction box. It can effectively avoid the additional loss of electric energy caused by the use of resistance sampling method during current sampling, and does not interfere with the normal operation of photovoltaic modules.
  • the proposed current sampling system for photovoltaic modules includes a current transformer 101, an access gateway 102, a processing device 103, and an intelligent junction box 104, wherein the intelligent junction box is associated with There is a corresponding photovoltaic module for outputting the electrical energy generated by the photovoltaic module, and at least one smart junction box associated with the photovoltaic module is connected in series to form a current link, and the smart junction box does not sample current data.
  • the current transformer 101 samples the current data in the current link, and transmits the current data associated with the current link to the access gateway, wherein the current link includes at least one serial connection of photovoltaic modules.
  • the output of electrical energy generated by at least one photovoltaic module connected in series is realized through a smart junction box to obtain a corresponding current link, and then a current transformer is used for sampling at any position of the current link.
  • connection line of the secondary terminal of the current transformer is connected to the access gateway through a designated interface, and the sampled current data of the current link is sent to the access gateway, wherein one current transformer correspondingly collects one As for the current data in the current link, one current link includes at least one photovoltaic module connected in series, and different photovoltaic modules are connected in series through the corresponding intelligent junction box 104 .
  • n photovoltaic modules connected in series through the smart junction box on the current link 1, and the power generated by each photovoltaic module is transmitted through the smart junction box.
  • the number of photovoltaic modules and their associated smart junction boxes included on a current circuit can be configured according to actual configuration requirements, for example, n photovoltaic modules and their associated smart junction boxes can be configured.
  • the deployment positions of the current transformers on the sampled current links are not fixed, and the current transformers on different current links are connected to the access gateway through an extensible interface, and the current transformers on different current links are connected to the access gateway. Send the sampled current data.
  • the proposed current transformer is specifically a DC current transformer.
  • the closed iron cores I and II of the current transformer are made of ferromagnetic substances with very high permeability coefficients. (such as permalloy, etc.), the two primary coils are identical and connected in series, wherein through the DC current I1, the two secondary coils are identically connected in reverse series, connected to the auxiliary AC power supply through a bridge rectifier, and by measuring the bridge The current value output by the rectifier can correspond to the current value to be measured.
  • the two secondary windings are connected relative to each other, so in each half cycle when the auxiliary AC I2 is passed into the secondary winding, in an iron core, a secondary winding and a DC of the primary winding are generated.
  • the direction of the magnetic flux is opposite, and in the other core, a secondary winding produces the same direction of magnetic flux as the primary winding.
  • Access the gateway 102 receive the current data in the respective associated current links collected by at least one current transformer 101, and use the collected current data as the current measurement value of each photovoltaic module on the associated current link , and report the obtained current data to the processing device 103 .
  • the access gateway 102 receives current data on the current link correspondingly collected by at least one current transformer 101 through an extensible interface, determines the photovoltaic module information included in each current link, and converts the acquired current transformer The current data sampled 101 is used as the current measurement value of each photovoltaic module on the current link.
  • the deployment location of the access gateway 102 is not fixed, the access gateway 102 is configured with an expandable interface, and is connected with at least one current transformer through the expandable interface to obtain a current transformer Sampled current data.
  • the access gateway 102 can be deployed near an inverter that performs inversion processing on the current on the current link, so that the access gateway 102 can conveniently obtain current data of multiple different current links .
  • each photovoltaic module in the current link is connected in series, for a current link, the current value in the current link is not affected by the current sampling position, so the current mutual inductance
  • the current data in the current link sampled by the sensor at the deployed location can be used as the current measurement value of each photovoltaic module connected in series on the current link.
  • the access gateway 102 processes the obtained current data corresponding to different current links according to the specified data format, and transmits and reports it to the processing device 103, so that the processing device 103 can perform analysis and processing based on the obtained current data.
  • the access gateway 102 receives the operating data reported by each smart junction box 104, and uses the operating data and the measured current value corresponding to the photovoltaic module associated with the smart junction box 104 as each corresponding The sampling data of the photovoltaic modules is then reported to the processing device 103 after processing the obtained sampling data of the corresponding photovoltaic modules according to the specified data format.
  • the operation data includes the voltage data and temperature data of the photovoltaic module, and obtains the received location where the photovoltaic module is located. current data on the current link, and use the current data as the current measurement value of the photovoltaic module, and then associate the current measurement value with the voltage data and the temperature data as the sampling of the photovoltaic module
  • the data is processed according to the specified data format, it is transmitted to the processing device 103 .
  • the timing for the access gateway to report the sampling data to the processing device may be to report the current data of the photovoltaic module or other operating data immediately after receiving it, or to take the specified time length as the period , to report the received data.
  • the wiring gateway is deployed in the current transformer of the current link, and only detects the current at one position on the current link, which changes the sampling position of the current data of the photovoltaic modules, and does not need to use the smart junction box for current sampling, effectively avoiding the need for It reduces the power loss caused by the use of resistance sampling when the smart junction box uses resistance sampling, and improves the stability and high-efficiency operation of the current link without changing the original wiring mode of the photovoltaic modules.
  • the processing device 103 receives and records the current data of the corresponding current link reported by each access gateway 102, marks the corresponding timestamp corresponding to the current data, and stores the marked current data.
  • the processing device after receiving the current data of the corresponding current link reported by each access gateway 102, the processing device recognizes the current data included in the data of the specified data format sent by each access gateway , and determine the current time when the current data is received, mark the corresponding time stamp for the received current data, and then store the marked current data.
  • the processing device 103 receives the sampling data of each photovoltaic module sent by the access gateway, marks the corresponding time stamps for processing the respective sampling data, and stores the marked sampling data.
  • the sampled data includes current measurements, voltage data, and temperature data.
  • the processing device 103 obtains data associated with photovoltaic modules under different time stamps, and analyzes the operating status of the corresponding photovoltaic modules based on the associated data.
  • the associated data includes current measurements, voltage data, and temperature data for different photovoltaic modules pre-stored by the processing device.
  • the processing device may acquire current measurement values and voltage data sampled at different time points, analyze the operating conditions of photovoltaic modules, and analyze changes in current data and voltage data of a photovoltaic module.
  • the processing device 103 obtains the stored sampling data that is marked with the latest recorded timestamp and associated with each photovoltaic module, and filters out the temperature data in the sampling data that exceeds a preset temperature threshold.
  • the selected photovoltaic modules are regarded as abnormal photovoltaic modules, and corresponding abnormal information is displayed.
  • the processing device can determine whether the photovoltaic modules are abnormal according to the stored sampling data of each photovoltaic module marked with the latest recorded timestamp, and specifically, for the photovoltaic module.
  • a corresponding temperature threshold value is set for the temperature data, and photovoltaic modules whose temperature data exceeds the temperature threshold value are screened out as abnormal photovoltaic modules, and specific information of the abnormal photovoltaic modules is displayed.
  • the processing device determines that the newly recorded current measurement value of the photovoltaic module 1 is 1.5A, the voltage data at both ends of the photovoltaic module is 15V, the current temperature data is 50°C, and the set temperature threshold value is 45°C, it can be known that the photovoltaic The temperature data in the operating data of module 1 exceeds the set threshold, so the PV module 1 is an abnormal PV module. It is necessary to display that the PV module 1 is currently abnormal, and display the current link where the PV module 1 is located. and other information.
  • the smart junction box 104 outputs the electrical energy generated by the associated photovoltaic modules, and is connected in series with other smart junction boxes to form a current link; collects the operating data of the photovoltaic modules, and reports the operating data to the The access gateway, wherein the operation data includes voltage data and temperature data of the photovoltaic module.
  • the smart junction box 104 is installed corresponding to its associated photovoltaic modules, and different photovoltaic modules are connected in series by means of only the smart junction box, which can output the electrical energy generated by the photovoltaic modules, and collect the voltage data and voltage data of the associated photovoltaic modules. Temperature data, wherein the smart junction box does not sample the current data of the associated photovoltaic modules, and one smart junction box is associated with one photovoltaic module.
  • the smart junction box transmits the collected voltage data and temperature data to the access gateway by means of wired transmission or wireless transmission.
  • each smart junction box associated with photovoltaic modules can be used as each node on the current link, each node is equivalent to each DC power supply, and the entire current link can be regarded as each DC power supply string.
  • Each node has a corresponding positive terminal and a negative terminal. The node that is no longer connected to other nodes and whose positive terminal is directly connected to the inverter can be directly connected to the inverter as a sink node, and then selectively, the The current transformer is deployed on the transmission line between the sink node and the inverter.
  • Step 401 Receive current data in respective associated current links collected by at least one current transformer, and use the collected current data as a current measurement value of each photovoltaic module on the associated current link.
  • the current transformer is deployed on a current link formed by at least one photovoltaic module connected in series, samples the current data on the current link, and uses the current data as the current of each photovoltaic module on the current link Measurements.
  • the deployment position of the current transformer is not fixed, and one current transformer is used to sample the current data of one current link.
  • Step 402 Report each obtained current data to a processing device, so that the processing device can receive a timestamp corresponding to the current data mark and store the marked current data.
  • the processing device After obtaining the current data collected by the current transformer through the extensible interface, the obtained current data is reported to the processing device, so that the processing device can receive the corresponding current data, and mark the corresponding time stamp for the current data for subsequent analysis. deal with.
  • the present application proposes an electronic device including a processor 502 and a memory 501, wherein,
  • the processor 502 is configured to read the instructions in the memory 501 and perform the following operations:
  • an embodiment of the present disclosure proposes a computer-readable storage medium, which, when the instructions in the computer-readable storage medium are executed by an electronic device, enables the electronic device to perform: receiving at least one current transformer acquisition For the current data in the respective associated current links, the collected current data is used as the current measurement value of each photovoltaic module on the associated current link; the obtained current data is reported to the processing device for The processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
  • the current sampling system of the photovoltaic module includes a current transformer, an access gateway, and a processing device, and the current transformer is used for sampling current data in the current link, and transmitting the current data associated with the current link to an access gateway, wherein the current link includes at least one photovoltaic module connected in series;
  • the access gateway is configured to receive at least one current mutual inductance the current data in the respective associated current links collected by the device, take the collected current data as the current measurement value of each photovoltaic module on the associated current link, and report the obtained current data to the processing device;
  • the processing device is configured to receive and record the current data corresponding to the current link reported by each access gateway, mark a timestamp corresponding to the current data, and store the marked current data.
  • the one-time sampling of the current link through the current transformer replaces the traditional method of measuring the current of photovoltaic modules, and realizes non-destructive testing without affecting the original circuit, which greatly reduces the power loss of current sampling.
  • the sampling efficiency and sampling accuracy of the current are improved, the measurement circuit is simplified, the measurement cost is reduced, and the power consumption is greatly reduced.
  • embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions
  • the apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Un système et un procédé d'échantillonnage de courant pour des modules photovoltaïques qui permettent de résoudre le problème qui se pose lorsque le courant généré par les modules photovoltaïques ne peut pas être mesuré en toute sécurité sans causer de pertes. Le procédé comprend les étapes suivantes : un système comprend un transformateur de courant (101) pour échantillonner des données de courant dans une liaison de courant et transmettre les données de courant associées à la liaison de courant à une passerelle d'accès (102) ; une passerelle d'accès (102) pour recevoir les données de courant acquises par au moins un transformateur de courant (101) auprès de chaque liaison de courant associée et signaler les données de courant acquises à un dispositif de traitement (103), et un dispositif de traitement (103) pour recevoir et enregistrer les données actuelles de la liaison actuelle correspondante signalées par chaque passerelle d'accès (102), de telle sorte que l'échantillonnage des liaisons de courant soit effectué à un moment donné au moyen du transformateur de courant (101). Contrairement aux procédés classiques de mesure du courant de modules photovoltaïques, le présent procédé permet d'effectuer une mesure non destructive sans affecter le circuit d'origine, ce qui réduit considérablement la perte de puissance de l'échantillonnage de courant et améliore l'efficacité de l'échantillonnage de courant et la précision de l'échantillonnage.
PCT/CN2020/115076 2020-09-10 2020-09-14 Système et procédé d'échantillonnage pour modules photovoltaïques WO2022052105A1 (fr)

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CN202010949188.XA CN112198359A (zh) 2020-09-10 2020-09-10 一种光伏组件的电流采样系统及方法
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