WO2020111336A1 - Procédé de suivi du point de puissance maximum d'un appareil de conversion d'énergie photovoltaïque - Google Patents

Procédé de suivi du point de puissance maximum d'un appareil de conversion d'énergie photovoltaïque Download PDF

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Publication number
WO2020111336A1
WO2020111336A1 PCT/KR2018/015039 KR2018015039W WO2020111336A1 WO 2020111336 A1 WO2020111336 A1 WO 2020111336A1 KR 2018015039 W KR2018015039 W KR 2018015039W WO 2020111336 A1 WO2020111336 A1 WO 2020111336A1
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WIPO (PCT)
Prior art keywords
value
voltage value
maximum power
current
power
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Ceased
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PCT/KR2018/015039
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English (en)
Korean (ko)
Inventor
민준기
최원석
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Industry Academic Cooperation Foundation of Hanbat National University
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Industry Academic Cooperation Foundation of Hanbat National University
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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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • 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
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the present invention relates to a maximum power tracking method of a solar power conversion device, and more particularly, it detects the voltage, current and temperature of the solar cell, and is characterized in that it follows the maximum power, the maximum power of the solar power conversion device. It is about following method.
  • MPPT maximum power point tracking
  • the maximum power tracking control method is a method for operating the operating point of the solar module to follow the maximum power point, and a method of tracking the output voltage by solar radiation is generally used.
  • the control method of following the maximum power by the amount of insolation has been raised to be insensitive to temperature changes and thus the case of not being able to follow the maximum power has been raised.
  • the general maximum power tracking method follows the voltage and power measured in units of sampling cycles, which operates regardless of the temperature change of the solar cell module.
  • the maximum power tracking point moves to the second position of S2 as the temperature changes at the maximum power point, and to the third position of S3 according to a larger change in temperature.
  • the maximum power point in S2 is position 4, and the maximum power point in S3 is position 5. Accordingly, in the S2 graph situation where the temperature change occurred In the S3 graph situation where there is a lot of loss and the temperature change is more severe As much as the loss has occurred, there is a need to solve the above problems.
  • Patent No. 10-1550227 discloses a grid-connected power storage system and method for controlling maximum power point tracking using ambient temperature.
  • the registered patent retrieves the outside temperature and solar radiation from the energy management system and the energy management system that retrieves the outdoor temperature and solar radiation at the location of the solar panel and transmits it to the maximum power point tracking device.
  • It includes a grid-connected power storage system and a method including a maximum power follow-up device that predicts a maximum power section by using the system, searches for the maximum power section, and controls the maximum power point tracking.
  • the registered patent is to measure and use the outside temperature, and it is judged to be a completely different invention from the method and operation of the present invention using the temperature of the solar cell module.
  • Patent No. 10-1458363 discloses a maximum power tracking method of a solar power system for tracking maximum power in response to a change in solar radiation.
  • the above registered patent relates to an existing maximum power tracking method using solar radiation fluctuation, and is considered to be a completely different invention from the method and operation using the temperature of the solar cell module.
  • the present invention is a method for solving the problems of the prior art as described above, by sensing the voltage, current and temperature of the solar cell module to be able to follow the maximum power, the maximum power tracking of the solar power converter
  • the purpose is to provide a method.
  • the present invention corrects the voltage value compensated by the temperature value measured in the solar cell module according to the voltage and power fluctuation of the solar cell module, thereby correcting the maximum power tracking voltage value, thereby obtaining the highest output value of the solar cell module in the power converter. You can make them follow.
  • FIG. 1 is a view for explaining a change in the maximum power value of the power conversion device according to the heat value of the conventional solar cell module.
  • FIG. 2 is a block diagram showing a solar power conversion device according to an embodiment of the present invention.
  • Figure 3 is a flow chart showing a maximum power tracking method of the solar power conversion apparatus according to an embodiment of the present invention.
  • the present invention for solving the above problems relates to a maximum power tracking method of a photovoltaic power conversion device, in more detail, receiving the temperature (T), current (I) and voltage (V) measured in the solar cell module Measurement step; And the current temperature of the solar cell module measured in the measurement step ( Compensation voltage according to) Computation value calculation step of calculating); And the current of the solar cell module measured in the measuring step ( ) And voltage ( Power according to) Calculated, calculated power ( ) And voltage ( ), the maximum power tracking voltage value in the power converter ( It is characterized in that it comprises a; following step of calculating).
  • the compensation voltage value ( ) Is characterized by being calculated by Equation 1 below.
  • the compensation voltage value ( ) Is the measured current temperature ( ) Compares the reference temperature (a) and the reference temperature (a), and the current voltage value ( ) To the measured current temperature ( ) And the absolute value of the difference between the reference temperature (a) is multiplied by a value multiplied by the compensation constant (k).
  • the compensation voltage value ( ) Is the measured current temperature ( ) Is less than or equal to the reference temperature (a)
  • the absolute value of the difference between the reference temperature (a) is multiplied by the value multiplied by the compensation constant (k).
  • the calculated current power value ( ) Is the power value calculated at the previous point ( ) If greater than or less than, the measured current voltage value ( ), the maximum power tracking voltage value at the previous point ( ) To the following voltage value ( It is characterized by adding or subtracting.
  • the calculated current power value ( ) Is the power value calculated at the previous point ( ), and the current voltage value ( ) Is the voltage value at the previous point ( ), or the calculated current power value ( ) Is the power value calculated at the previous point ( ), the current voltage value ( ) Is the voltage value at the previous point ( ) Or less than, the maximum power tracking voltage value ( ) Is the maximum power tracking voltage value from the previous point ( ) To the following voltage value ( It is characterized by subtracting.
  • the calculated current power value ( ) Is the power value calculated at the previous point ( ), and the current voltage value ( ) Is the voltage value at the previous point ( ), or the calculated current power value ( ) Is the power value calculated at the previous point ( ), the current voltage value ( ) Is the voltage value at the previous point ( ) Or less than, the maximum power tracking voltage value ( ) Is the maximum power tracking voltage value from the previous point ( ) To the following voltage value ( It is characterized by increasing or decreasing.
  • the calculated current power value ( ) Is the power value calculated at the previous point ( )
  • the maximum power tracking voltage value ( ) Is the maximum power tracking voltage value from the previous point ( It is characterized by maintaining.
  • FIG. 2 is a structural diagram of a solar power system to which the maximum power tracking method of the present invention is applied.
  • the components of the solar power system to which the maximum power tracking method of the present invention is applied will be described with reference to FIG. 2.
  • the photovoltaic system to which the present invention is applied measures the module temperature of each of the solar cell unit 100 including one or more solar cell modules (C) and one or more solar cell modules (C) in the solar cell unit 100. It includes a temperature sensing unit 200 and a power conversion unit 300 and a control unit 400 for converting the electric power produced by the solar cell unit 100, the power supply unit 500.
  • the power conversion unit 300 includes general components such as a converter for converting the power produced by the solar cell unit 100
  • the control unit 400 also includes the solar cell unit 100 ), including the general components for controlling the power conversion unit 300 and the power supply unit 500, but controls the characteristic temperature sensing unit 200 of the present invention and the temperature measured from the temperature sensing unit 200 ( T) value is received to realize the maximum power tracking method of the present invention.
  • the power supply unit 500 is also a general component for providing power to the remaining components.
  • the temperature sensing unit 200 includes at least one infrared image camera to individually measure the temperature of each solar cell module C, and measures the temperature of each solar cell module C in real time. It is preferred.
  • the reason why the temperature sensing unit 200 selects an infrared image camera as a means for measuring the temperature of the solar cell modules C is that the temperature of the plurality of solar cell modules C is efficiently used by using a thermal image. This is because it can be measured.
  • thermometer to each solar cell module (C).
  • FIG. 3 is a flow chart showing the maximum power tracking method of the present invention.
  • a maximum power tracking method of the present invention will be described with reference to FIG. 3.
  • temperatures T indicated in FIG. 3 and described below are all expressed in degrees Celsius (Celsius).
  • the compensation constant (k), which will be described below, is a value determined by the product of the voltage and the temperature coefficient of the solar cell module C, and varies depending on the type and performance of the Taeyoung battery module C. Even the same solar cell module C may fluctuate as the temperature of the solar cell module C changes according to an operation or an external environment.
  • the compensation constant (k) value of the most used silicon solar cell is-0.3%/°C.
  • the maximum power tracking method of the present invention includes a measurement step in which the control unit 400 measures voltage (V), current (I), and temperature (T) of each module (C) ( S1).
  • the measurement of the voltage (V) and the current (I) may be performed in a conventional manner, and the measurement of the temperature (T) is provided by the temperature sensing unit 200 to the control unit 400.
  • control unit 400 receives the temperature (T), current (I), and voltage (V) values measured by the solar cell module, calculates the output power (P) from the solar cell module, and calculates it Detecting the variation of the output power P, the maximum power tracking voltage value in the power converter 300 ( ) Is repeated, and the following describes in more detail the maximum power tracking method of the solar power converter of the present invention.
  • the maximum power tracking voltage value ( ) Is a reference value for controlling the output voltage value of the solar cell module in the power conversion unit 300 so that the solar cell module can output at maximum power, according to the maximum power tracking method of the present invention, Considering the phenomenon that the maximum power value that can be output decreases as the internal temperature increases, the above-described reference value should be appropriately corrected.
  • the maximum power tracking method of the present invention the current temperature of the solar cell module measured in the measurement step (S1) ( Compensation voltage value according to) ) Computation value calculation step (D1 and S2 ⁇ S3) to calculate the current value of the solar cell module measured in the measurement step (S1) ( ) And voltage value ( Power value according to) ), and the calculated power value ( ) And voltage value ( ), the maximum power tracking voltage value in the power converter ( ) To perform following steps (D2 to D5 and S4 to S7) to correct.
  • the compensation voltage value ( ) Can be calculated by Equation 1 below,
  • ⁇ Compensation voltage value
  • Current voltage value Current voltage value
  • Measured current temperature k
  • compensation constant a: reference temperature ⁇ .
  • the compensation voltage value ( ) Is the measured current temperature ( ) Compares the reference temperature (a) and the reference temperature (a), and the current voltage value ( ) To the measured current temperature ( ) And the absolute value of the difference between the reference temperature (a) multiplied by the value multiplied by the compensation constant (k), and the compensation voltage value ( ) Is calculated or updated.
  • Equation 1-2
  • the compensation coefficient (k) is a value determined by multiplying the voltage and the temperature coefficient at the reference temperature (a) by the solar cell module (C), and may vary depending on the type of the Taeyoung battery module (C).
  • the reference temperature (a) means the optimal temperature at which the solar cell module can output the maximum efficiency.
  • the solar cell module C can generate the maximum efficiency at 25 degrees Celsius.
  • the compensation constant (k) may vary depending on the type and performance of the solar cell module according to the reference temperature (a). In the case of a silicon solar cell having 25 degrees Celsius as the reference temperature for testing the characteristics as the reference temperature (a), the compensation constant (k) value is calculated as -0.3%/°C.
  • the maximum power tracking method is the current value of the solar cell module measured in the measurement step (S1) ( ) And voltage value ( Power value according to) ), and the calculated power value ( ) And voltage value ( ), the maximum power tracking voltage value in the power converter ( ) To perform the following steps (D2 ⁇ D5 and S4 ⁇ S7), wherein the maximum power tracking voltage value ( ) Can be calculated by Equation 2 below.
  • the following step is the calculated current power value ( ) Is the power value calculated at the previous point ( ) If greater than or less than, the measured current voltage value ( ), the maximum power tracking voltage value at the previous point ( ) To the following voltage value ( ), and the calculated current power value ( ) Is the power value calculated at the previous point ( ), the maximum power tracking voltage value ( ) Is the maximum power tracking voltage value from the previous point ( ).
  • the output power (P(t)) at the current point in time and the output at the immediately preceding point Compare the power (P(t-1)).
  • the maximum power tracking voltage value ( ) Is the current maximum power tracking voltage value and the following voltage value ( The maximum power tracking voltage value (S4) through updating (S4) and saving the value by subtracting) ) And proceeds to the next time interval.
  • the maximum power tracking voltage value ( ) Is the current maximum power tracking voltage value and the following voltage value ( ) Is updated and stored with the added value (S5), and the maximum power tracking voltage value ( ) And proceeds to the next time interval.
  • the maximum power tracking voltage value ( ) Is the current maximum power tracking voltage value and the following voltage value ( The maximum power tracking voltage value (S6) through updating (S6) and saving the value by subtracting) ) And proceeds to the next time interval.
  • the maximum power tracking voltage value ( ) Is the current maximum power tracking voltage value and the following voltage value ( ) Is updated and stored with the added value (S7), and the maximum power tracking voltage value ( ) And proceeds to the next time interval.
  • the present invention relates to a method for following the maximum power of a solar power conversion device, and it is possible to follow the maximum power point by following the maximum power point using the temperature of the solar cell module, thereby preventing burnout due to the hot spot phenomenon of the solar cell module. By doing so, it is possible to extend the lifespan of the solar cell module, and to prevent the loss that may occur due to the power conversion unit bringing the power rather than the maximum power, and accordingly send a signal to the upper control circuit to ensure the safety. There is potential for industrial use in the photovoltaic field.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
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Abstract

La présente invention concerne un procédé de suivi d'un point de puissance maximum d'un appareil de conversion d'énergie photovoltaïque, dans lequel le point de puissance maximum est suivi par détection de la tension, du courant et de la température de cellules solaires et, plus précisément, un procédé de suivi d'un point de puissance maximum d'un appareil de conversion d'énergie photovoltaïque, dans lequel, par suivi du point de puissance maximum à l'aide de la température d'un module de cellule solaire, un suivi précis de point de puissance maximum est possible et, par conséquent, un endommagement d'un feu provoqué par l'apparition de points chauds dans un module de cellule solaire peut être empêché, conduisant à l'extension de la durée de vie du module de cellule solaire et dans lequel une unité de conversion de puissance peut empêcher une perte qui peut se produire à la suite d'un suivi de puissance, non une puissance maximum, et par conséquent, peut transmettre un signal à un circuit de commande de niveau supérieur, ce qui permet d'assurer la sécurité.
PCT/KR2018/015039 2018-11-28 2018-11-30 Procédé de suivi du point de puissance maximum d'un appareil de conversion d'énergie photovoltaïque Ceased WO2020111336A1 (fr)

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KR10-2018-0150059 2018-11-28
KR1020180150059A KR20200063850A (ko) 2018-11-28 2018-11-28 태양광 전력변환장치의 최대전력 추종방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025028994A1 (fr) * 2023-08-02 2025-02-06 한화솔루션 주식회사 Procédé de prédiction de tension de point de fonctionnement optimal, et dispositif de conversion de puissance le mettant en œuvre

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN116559524B (zh) * 2023-05-18 2025-11-25 湖南恩智测控技术有限公司 光伏逆变器mppt效率评价方法、系统及存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580090A (en) * 1983-09-16 1986-04-01 Motorola, Inc. Maximum power tracker
KR20120138184A (ko) * 2011-06-14 2012-12-24 삼성전자주식회사 전자 장치 및 전원 공급 방법
KR101458363B1 (ko) * 2013-10-22 2014-11-06 공주대학교 산학협력단 일사량의 변동에 대응하여 최대전력을 추종하기 위한 태양광 발전시스템의 최대전력 추종방법
KR101550227B1 (ko) * 2012-11-28 2015-09-11 에스케이 주식회사 외기 온도를 이용한 최대 전력점 추종을 제어하는 계통 연계형 전력 저장 시스템 및 방법
KR101729217B1 (ko) * 2016-07-28 2017-05-02 주식회사 케이디티 태양광 발전 시스템의 인버터 mppt 성능 진단 장치 및 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580090A (en) * 1983-09-16 1986-04-01 Motorola, Inc. Maximum power tracker
KR20120138184A (ko) * 2011-06-14 2012-12-24 삼성전자주식회사 전자 장치 및 전원 공급 방법
KR101550227B1 (ko) * 2012-11-28 2015-09-11 에스케이 주식회사 외기 온도를 이용한 최대 전력점 추종을 제어하는 계통 연계형 전력 저장 시스템 및 방법
KR101458363B1 (ko) * 2013-10-22 2014-11-06 공주대학교 산학협력단 일사량의 변동에 대응하여 최대전력을 추종하기 위한 태양광 발전시스템의 최대전력 추종방법
KR101729217B1 (ko) * 2016-07-28 2017-05-02 주식회사 케이디티 태양광 발전 시스템의 인버터 mppt 성능 진단 장치 및 방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025028994A1 (fr) * 2023-08-02 2025-02-06 한화솔루션 주식회사 Procédé de prédiction de tension de point de fonctionnement optimal, et dispositif de conversion de puissance le mettant en œuvre

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