WO2016085010A1 - Système et procédé pour diagnostiquer efficacement si une anomalie existe dans chaque module solaire - Google Patents

Système et procédé pour diagnostiquer efficacement si une anomalie existe dans chaque module solaire Download PDF

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Publication number
WO2016085010A1
WO2016085010A1 PCT/KR2014/011542 KR2014011542W WO2016085010A1 WO 2016085010 A1 WO2016085010 A1 WO 2016085010A1 KR 2014011542 W KR2014011542 W KR 2014011542W WO 2016085010 A1 WO2016085010 A1 WO 2016085010A1
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module
string
output voltage
modules
specific
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PCT/KR2014/011542
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English (en)
Korean (ko)
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송기택
이철송
오지환
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(주)대은
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    • 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
    • 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
    • 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • 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 invention relates to a system and method for efficiently diagnosing abnormalities of photovoltaic modules in a photovoltaic power generation system. More specifically, the present invention relates to string stages based on measured current values measured at string stages in which modules are connected in series. After checking whether or not an error occurred in the module, check whether or not the error occurred based on the measured voltage value measured for each module only for the string in which the error was diagnosed, thereby ensuring the accuracy as well as the speed of failure diagnosis by module.
  • the module In diagnosing abnormality of each module in the module, if a module whose output voltage value exceeds the effective voltage is separated by 2 or more in one string, the module located between modules whose output voltage value exceeds the effective voltage Specified by the module, or a module whose output voltage exceeds the effective voltage If it appears from the module in succession by a specific module for the particular front end of the module to at least generation module, to a module at least whether the diagnostic system and method that can accurately specify a specific string within the error occurrence module.
  • Solar cells are devices that convert light energy from sunlight into electrical energy.
  • a solar cell is a cell that generates electricity from light energy of sunlight (the smallest unit that generates electricity, hereinafter referred to as a 'cell'), a combination of the cells, and a cell module that sends electricity generated from each cell to the outside (extracting electricity Minimum unit, hereinafter referred to as a module), and a cell array defined as a combination of the above modules (hereinafter referred to as an 'array').
  • the technology of the photovoltaic device that is the background of the present invention is Republic of Korea Patent Publication No. 10-0455250 (2004.10.22), 10-1028159 (2011,04,01) and 10-1049786 (2011, 07,11).
  • the photovoltaic device further comprises a solar cell module, a storage battery, and a power conversion inverter in a power generation method using a solar cell that generates electricity.
  • Patent Publication No. KR10-0930132 (Registered Nov. 27, 2009) "Solar connection panel with monitoring function"
  • Patent Document 1 discloses a configuration for detecting a current flowing in a solar cell string and transmitting the same, and the content disclosed in (Patent Document 2) measures an output current value and an output voltage value and diagnoses it.
  • Patent Document 2 measures an output current value and an output voltage value and diagnoses it.
  • a configuration for monitoring is disclosed, this is merely a conceptual level of using a voltage value or a current value as a variable of the judgment on the abnormal module.
  • the present invention has been made to solve the above problems,
  • An object of the present invention is to first check whether an error occurs in the string stage based on the measured current value measured at the string stage in which the modules are connected in series, and then measure the measured voltage value of each module only for the string in which the fault is diagnosed. By checking whether or not an abnormality is generated based on the above, it is to provide a system and method for diagnosing abnormality of each module that can secure the accuracy as well as the speed of failure diagnosis by module.
  • Another object of the present invention in diagnosing whether there is an error for each module in the string end, a module whose output voltage value exceeds the effective voltage when the module whose output voltage value exceeds the effective voltage is separated by two or more in one string.
  • a system and method for efficiently diagnosing abnormalities of solar modules for achieving the above object of the present invention include the following configurations.
  • a system for efficiently diagnosing abnormalities of solar modules includes an array including one or more strings connected in series with one or more solar modules for converting solar energy into electrical energy; An output voltage sensing unit measuring an output voltage value of each module of the array; An output current sensing unit measuring the output current value of each string; And an abnormality diagnosis unit for diagnosing whether an abnormality occurs in a specific module in the string based on the measured values measured by the output current detection unit and the output voltage detection unit, wherein the abnormal diagnosis unit is measured by the output current detection unit. Diagnose the abnormality of each string based on the output current value, and then diagnose the abnormality of each module in the corresponding string based on the output voltage value measured by the output voltage detector for the string diagnosed as an abnormal state. Characterized in that.
  • the abnormality diagnosis unit compares the output current value of a specific string measured by the output current sensing unit with a reference value or an average value of output current values of another string.
  • An error string specific module for diagnosing an abnormal module based on an abnormal string specific module for diagnosing an abnormal condition first and an output voltage value of a specific module in the corresponding string measured by the output voltage sensing unit for the string diagnosed as an abnormal condition. It characterized in that it comprises a module.
  • the abnormal module specific module has an output voltage value exceeding an effective voltage value when the module whose output voltage value exceeds an effective voltage in a string is two or more apart. It characterized in that the module located between the modules to be identified as the error generating module.
  • the abnormal module specific module is a module in front of the specific module when a module whose output voltage value exceeds an effective voltage in a string is continuously present from the specific module. It is characterized in that it is specified as an error generation module.
  • a method for efficiently diagnosing an abnormality for each solar module includes output voltage sensing for measuring an output voltage value of each module of an array including one or more strings in which one or more solar modules are connected in series. step; An output current sensing step of measuring an output current value of each string; And an abnormality diagnosis step of diagnosing whether an abnormality occurs in a specific module in a string based on the measured values measured in the output current detection step and the output voltage detection step, wherein the abnormal diagnosis step is performed in the output current detection step.
  • the abnormal diagnosis step may be performed by comparing the output current value of a specific string measured in the output current detection step with a reference value or an average value of output current values of another string.
  • An abnormal string specific step of diagnosing an abnormality of a specific string first, and an abnormality diagnosing an abnormal module based on an output voltage value of a specific module in the corresponding string measured in the output voltage sensing step for the string diagnosed as an abnormal condition. Characterized in that the module comprises a specific step.
  • the abnormal module specific step may include outputting an effective voltage value when an output voltage value exceeds an effective voltage within a string and two or more modules are separated from each other. It is characterized by specifying a module located between the excess modules as an error generating module.
  • the abnormal module specifying step may be performed when a module whose output voltage value exceeds an effective voltage in a string continuously appears from a specific module. It is characterized by specifying a module as an abnormality generating module.
  • the present invention can obtain the following effects by the configuration, combination, and use relationship described above with the present embodiment.
  • the present invention first checks whether an error occurs in the string stage based on the measured current value measured at the string stage in which the modules are connected in series, and then based on the measured voltage value measured for each module only for the string in which the fault is diagnosed. By checking the occurrence, it is possible to ensure the accuracy as well as the speed of failure diagnosis for each module.
  • the output voltage value when diagnosing an abnormality for each module at a string end, when an output voltage value exceeding an effective voltage within two strings is separated by two or more, the output voltage value is positioned between modules exceeding an effective voltage. If a module is specified as an error module or if a module whose output voltage value exceeds the effective voltage in one string is continuously displayed from a specific module, an error occurs in the string by specifying the module in front of the specific module as an error module. This has the effect of accurately specifying the module.
  • 1 is a reference diagram showing a remote monitoring system of the photovoltaic device
  • FIG. 2 is a block diagram showing the configuration of a system for efficiently diagnosing abnormalities of solar modules according to an embodiment of the present invention.
  • 3 is a reference diagram illustrating a case where two or more modules having an output voltage value exceeding an effective voltage in one string are separated from each other and measured by two or more;
  • FIG. 4 is a reference diagram illustrating a case in which a module whose output voltage value exceeds an effective voltage in one string is continuously displayed from a specific module.
  • FIG. 5 is a block diagram illustrating a method for efficiently diagnosing abnormalities of solar modules according to an embodiment of the present invention.
  • coordinator 70 output voltage detection unit
  • abnormal diagnosis part 810 abnormal string specific module
  • the photovoltaic device includes an array 20 (a plurality of modules 10 in an array) in which a plurality of photovoltaic modules 10, which are the smallest units that actually transmit electricity generated (generated), are gathered together. They comprise one or more strings 12 connected in series, and in the case of large-scale photovoltaic power generation, at least tens, hundreds or more arrays 20 are installed and operated. Equipment such as a van 30, an inverter 40, a sensor 50 for monitoring, a coordinator 60 for transmitting / receiving, etc. will be included).
  • the voltage of the photovoltaic module 10 is lowered (in other words, the efficiency of the module is lowered). At this time, the module 10 in which the voltage drop has occurred is accurately identified and When the cause of the voltage drop is notified to the operator, countermeasures such as replacement, repair, and cleaning of the module 10 are taken.
  • a monitoring system of a photovoltaic device simply diagnoses that an output (voltage) is lowered at an array 20 stage, and then an inspector manually measures each module of the array in such an array so that an abnormality occurs.
  • modules have been used to specify or have been used to diagnose output (voltage) degradation in the strings 12 in which the modules 10 are connected in series, the modules 10 may be connected in series.
  • the output (voltage) of one module 10 decreases, the output (voltage) of the other modules 10 around it increases complementarily, so that the output (voltage) of the string 12 is equal to some extent.
  • the present invention first checks whether or not an error occurs in the string 12 stage based on the measured current value measured at the string 12 stage in which the modules 10 are connected in series. Only the diagnosed string 12 is checked for abnormality on the basis of the measured voltage value measured for each module 10, and thus the module for diagnosing abnormality for each module which can ensure the accuracy as well as the accuracy of the fault diagnosis for each module and I would like to present a way.
  • the fault module diagnosis system in a series connected solar module string includes one or more solar modules 10 for converting solar energy into electrical energy in series.
  • An output voltage sensing unit 70 measuring an output voltage value of each module 10 in the array 20 including one or more strings 12 connected to each other;
  • An output current sensing unit 90 measuring an output current value of each of the strings 12;
  • an abnormality diagnosis unit 80 for diagnosing whether an abnormality has occurred in a specific module 10 in the string 12 based on the measured values measured by the output current detection unit 90 and the output voltage detection unit 70.
  • the abnormality diagnosis unit 80 first diagnoses whether the string 12 is abnormal based on the output current value measured by the output current detecting unit 90, and then diagnoses the string 12 as an abnormal state. With respect to the output voltage value measured by the output voltage detection unit 70, characterized in that for diagnosing whether the abnormality for each module 10 in the string (12).
  • the output voltage detecting unit 70 is configured to measure and provide an output voltage value for each module 10 with respect to the plurality of modules 10 located in the array 20.
  • the voltage mounted for each module 10 is provided. Sensors and the like can be utilized.
  • the data measured by the output voltage detection unit 70 is provided to the abnormality diagnosis unit 80 to be described later through wired and wireless communication means.
  • the output current sensing unit 90 is configured to measure and provide an output current value for each string 12 at a string 12 terminal in which the modules 10 are connected in series, and the current mounted at the end of the string 12. Sensors and the like can be utilized. It is difficult to measure current for each module 10 in the string 12 connected in series, and measuring voltage and current for each module 10 is inefficient in terms of cost.
  • the output current value is measured only for each of the strings 12 through the output current detection unit 90, and the measured data is provided to the abnormal diagnosis unit 80 to be described later through wired and wireless communication means.
  • the abnormality diagnosis unit 80 is configured to diagnose whether or not an abnormality occurs in the specific module 10 in the string 12 based on the measured values measured by the output current detection unit 90 and the output voltage detection unit 70.
  • the abnormality diagnosis unit 80 first diagnoses an abnormality of each of the strings 12 based on the output current value measured by the output current detecting unit 90, and then diagnoses the abnormal state of the string. (12) is characterized in that the diagnosis for each module 10 in the string 12 on the basis of the output voltage value measured by the output voltage detecting unit 70, for this purpose
  • the diagnosis unit 80 compares an output current value of the specific string 12 measured by the output current detection unit 90 with a reference value or an average value of output current values of the other strings 12 to determine an abnormality of the specific string 12.
  • An abnormal string specific module 810 for diagnosing whether or not, an abnormal state The fault module specific module for diagnosing the fault generating module 10 based on the output voltage value of the specific module 10 in the corresponding string 12 measured by the output voltage detecting unit 70 with respect to the diagnosed string 12. 820.
  • the abnormal string specifying module 810 compares the output current value of the specific string 12 measured by the output current sensing unit 90 with a reference value or an average value of output current values of the other strings 12. As described above, as described above, it is difficult to measure current for each module 10 in the string 12 in which the modules 10 are connected in series, and voltage and current for each module 10. It is inefficient to measure all of them. Also, if the module 10 has an abnormality in any one of the modules 10 in the string 12 connected in series and the output is reduced or eliminated, the corresponding string 12 An abnormality occurs in the current value output from the stage (the current value falls). In the present invention, the string 12 stage in which the modules 10 are connected in series rather than the individual modules 10 is focused on this point.
  • Output current value only It is possible to diagnose the presence or absence of abnormality in the string 12 stage only by measuring the value, and only measure the output current value for each string 12 through the output current sensing unit 90 only at the string 12 stage. Compared to diagnosing abnormality individually for a large number of modules 10 individually, only the string 12 diagnosed as abnormal by first diagnosing abnormality for each of the strings 12 in the string 12 The diagnosis of each module 10 is performed so that a quick and accurate diagnosis can be made.
  • the abnormal string specifying module 810 may diagnose the abnormality of the specific string 12 by comparing the output current value of the specific string 12 with a reference value or an average value of the output current values of the other string 12.
  • the abnormal module specific module 820 is abnormal based on the output voltage value of the specific module 10 in the corresponding string 12 measured by the output voltage detecting unit 70 for the string 12 diagnosed as an abnormal state. This is a configuration for diagnosing the generation module 10.
  • the abnormal module specific module 820 is the output voltage value of the corresponding module 10 is lowered when an error occurs in the specific module 10 in the string 12 in which the modules 10 are connected in series.
  • it is used to increase the measured output voltage value of the peripheral module 10 of the module 10 in which the abnormality occurs compared to the effective voltage in the normal case (for example, in the string 12 as shown in FIG. 3).
  • the abnormal module specific module 820 is, for example, a module in which the output voltage value exceeds the effective voltage when the module 10 whose output voltage value exceeds the effective voltage is spaced apart from each other in one string 12.
  • Module 10 located between the (10) is specified as the fault generating module (10). That is, referring to FIG. 3, the modules 10-1 to 10-2, 10 spaced apart from each other by the specific modules 10-3, 10-4, and 10-5 in the string 12 therebetween.
  • the abnormal module measuring module 10 includes a specific module 10 between them. -3, 10-4, 10-5) can be specified as the module in which the error occurs, so that the location of the error module can be accurately presented.
  • the specific module 10 when the module 10 whose output voltage value exceeds the effective voltage in one string 12 appears continuously from the specific module 10, the specific module 10 may be used.
  • the module 10 immediately before is identified as the abnormality generating module 10. That is, referring to FIG. 4, when the output voltage value is continuously higher than the effective voltage range (for example, about 15 to 20 V) from the specific module 10-5 in the string 12 thereafter.
  • the module 10-4 immediately preceding the specific module 10-5 may be identified as the module in which the abnormality has occurred so that the position of the abnormality module 10-4 can be accurately presented. Since the modules 10 are connected to the string 12 in series, the actual voltage value actually measured and displayed is high in the left and right sides of the module 10 in which the error occurs. In the case of appearing higher from the rear end of the abnormal module-specific module 820, even in such a case (reflecting the case), it is possible to accurately specify the position of the error generating module 10.
  • a method for efficiently diagnosing abnormalities of solar modules includes an array including one or more strings 12 connected in series with one or more solar modules 10.
  • An output voltage sensing step of measuring an output voltage value of each module of step 20;
  • An output current sensing step (S20) of measuring output current values for each of the strings 12;
  • an abnormality diagnosing step (S30) for diagnosing whether or not an abnormality has occurred in a specific module 10 in the string 12 based on the measured values measured in the output current detecting step (S20) and the output voltage detecting step (S10).
  • the abnormality diagnosing step (S30) may first diagnose whether or not each of the strings 12 is abnormal based on the output current value measured in the output current detecting step (S20), and then diagnose the abnormal state of the string 12. It is characterized in that for diagnosing whether there is an error for each module 10 in the string 12 on the basis of the output voltage value measured in the output voltage detection step (S10).
  • the output voltage sensing step S10 is a step of measuring and providing an output voltage value for each module 10 with respect to the plurality of modules 10 located in the array 20, and the voltage mounted for each module 10. Measuring using a sensor, etc., the measured data is provided to the abnormality diagnosis unit 80 through a wired, wireless communication means.
  • the output current sensing step (S20) is a process of measuring and providing an output current value for each string 12 at a string 12 terminal in which the modules 10 are connected in series, and the current mounted at the end of the string 12. Use sensors. Since it is difficult to measure current for each module 10 in the string 12 connected in series, and measuring voltage and current for each module 10 is inefficient in terms of cost, in the output current sensing step S20, The output current value is measured only for each of the strings 12 through the output current detection unit 90 only at the string 12 end, and the measured data is provided to the abnormality diagnosis unit 80 through wired or wireless communication means.
  • the abnormal diagnosis step (S30) is a process of diagnosing whether an error occurs in a specific module 10 in the string 12 based on the measured values measured in the output current detection step (S20) and the output voltage detection step (S10). In more detail, whether the specific string 12 is abnormal is compared with the average value of the output current values of the specific string 12 measured in the output current sensing step S20 with reference values or the output current values of the other strings 12.
  • the abnormal string specifying step S31 may be performed by comparing the output current value of the specific string 12 measured by the output current sensing unit 90 with a reference value or an average value of output current values of the other strings 12. As described above, as described above, it is difficult to measure the current for each module 10 in the string 12 in which the modules 10 are connected in series, and also to measure the voltage and current for each module 10. Measuring all is inefficient in terms of cost, and if the module 10 is connected to a string 12 connected in series, an error occurs in any one module 10 and the output is reduced or eliminated. An abnormality occurs in the current value outputted from the current value (the current value falls). In the abnormal string specific step (S31), the module 10 is connected in series instead of the individual modules 10 by focusing on this point.
  • the abnormal module specifying step (S32) is more abnormal than the output voltage value of the corresponding module 10 is lowered when an error occurs in the specific module 10 in the string 12 in which the modules 10 are connected in series.
  • the measured output voltage value in the peripheral module 10 of the generated module 10 rises relative to the effective voltage in a normal case (for example, as shown in FIG. 3, the specific module 10-10 in the string 12 is used. 3, 10-4, 10-5)
  • the measured voltage measured in the peripheral modules 10-1, 10-2, 10-6 ⁇ 10-9 The value is measured higher than the effective voltage range (for example, about 15 to 20 V) to enable accurate diagnosis of the presence of the abnormality generating module 10 in the string 12.
  • the output voltage when the module 10 whose output voltage value exceeds the effective voltage in the string 12 is specified as the fault generating module 10. That is, referring to FIG. 3, the modules 10-1 to 10-2, 10 spaced apart from each other by the specific modules 10-3, 10-4, and 10-5 in the string 12 therebetween.
  • the specific module 10 therebetween. -3, 10-4, 10-5) can be specified as the module in which the error occurs, so that the location of the error module can be accurately presented.
  • the module 10 immediately before the specific module 10 Is specified as the abnormality generation module 10. That is, referring to FIG. 4, when the output voltage value is continuously higher than the effective voltage range (for example, about 15 to 20 V) from the specific module 10-5 in the string 12 thereafter.
  • the module 10-4 immediately preceding the specific module 10-5 may be identified as the module in which the abnormality has occurred so that the position of the abnormality module 10-4 can be accurately presented. Since the modules 10 are connected to the string 12 in series, the actual voltage value actually measured and displayed is high in the left and right sides of the module 10 in which the error occurs.
  • the position of the abnormality generating module 10 can be accurately specified even in this case (also reflecting the case).

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Abstract

L'invention concerne un système et un procédé pour diagnostiquer si une anomalie existe dans chaque module solaire d'un système de génération d'énergie solaire, et plus particulièrement un système et un procédé pour diagnostiquer si oui ou non une anomalie existe dans chaque module dans lequel, sur la base de la valeur de courant actuelle mesurée pour chaque chaîne de modules montés en série, chaque chaîne est vérifiée pour savoir si une anomalie existe à l'intérieur de celle-ci, puis seuls les modules des chaînes diagnostiquées comme ayant une anomalie sont vérifiés quant à l'existence d'une anomalie sur la base des valeurs de tension mesurées actuelles, ce qui permet d'assurer le diagnostic précis et rapide de défauts, et par rapport au diagnostic d'anomalies par module de chaque chaîne, si les modules pour lesquels les valeurs de tension de sortie dépassent la tension efficace sont séparés en deux modules ou plus à l'intérieur d'une chaîne unique, les modules situés entre les modules pour lesquels les valeurs de tension de sortie dépassent la tension efficace sont spécifiés comme étant des modules anormaux, ou si les modules pour lesquels les valeurs de tension de sortie dépassent la tension efficace apparaissent successivement à partir d'un module particulier dans une chaîne unique, alors le module précédent correspondant au module particulier est désigné comme étant le module anormal, ce permet de spécifier précisement les modules anormaux à l'intérieur d'une chaîne.
PCT/KR2014/011542 2014-11-28 2014-11-28 Système et procédé pour diagnostiquer efficacement si une anomalie existe dans chaque module solaire WO2016085010A1 (fr)

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KR102187383B1 (ko) * 2020-05-11 2020-12-04 주식회사 주왕산업 태양광 모듈별 발전전류를 관리하는 태양광 발전 시스템
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JP2012109504A (ja) * 2010-11-15 2012-06-07 Japan Solar Co Ltd 太陽電池パネル監視システム
KR20130052137A (ko) * 2011-11-11 2013-05-22 박동균 태양전지판의 고장진단 원격감시 시스템
JP2013120803A (ja) * 2011-12-06 2013-06-17 Ntt Facilities Inc 太陽光発電装置の故障検出装置
US20130201027A1 (en) * 2012-02-03 2013-08-08 Charles E. Bucher Apparatus and Method for Detecting Faults in a Solar Module

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