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WO2024205346A2 - Dispositif électronique de puissance de niveau de module, et procédé de fonctionnement de système de génération d'énergie solaire le comprenant - Google Patents

Dispositif électronique de puissance de niveau de module, et procédé de fonctionnement de système de génération d'énergie solaire le comprenant Download PDF

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Publication number
WO2024205346A2
WO2024205346A2 PCT/KR2024/004191 KR2024004191W WO2024205346A2 WO 2024205346 A2 WO2024205346 A2 WO 2024205346A2 KR 2024004191 W KR2024004191 W KR 2024004191W WO 2024205346 A2 WO2024205346 A2 WO 2024205346A2
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WIPO (PCT)
Prior art keywords
switch
power generation
mlpe
generation system
mode
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PCT/KR2024/004191
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English (en)
Korean (ko)
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WO2024205346A3 (fr
Inventor
박종현
박일규
신지원
최윤석
윤주환
Original Assignee
한화솔루션 주식회사
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Publication of WO2024205346A2 publication Critical patent/WO2024205346A2/fr
Publication of WO2024205346A3 publication Critical patent/WO2024205346A3/fr

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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
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • 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—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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 module unit power conversion device and an operating method of a solar power generation system including the same.
  • MLPE module-level power electronics
  • the purpose of the present invention is to provide a solar power generation system and method capable of comprehensively diagnosing conditions such as a decrease in power generation.
  • An object of the present invention is to provide a solar power generation system and method capable of extracting a current-voltage curve without additional configuration.
  • a method for operating a solar power generation system including a plurality of module level power electronics (MLPEs) including: performing a maximum power point tracking (MPPT) control in a first mode of the MLPEs; disconnecting power connections between output terminals of the plurality of MLPEs and an inverter to convert the first mode to a second mode; controlling a duty ratio of a DC-DC converter provided in the MLPE after conversion to the second mode; and extracting an output voltage and an output current of each PV module connected to the plurality of MLPEs in the second mode.
  • MPPT maximum power point tracking
  • the operation of switching the first mode to the second mode may be an operation of opening the output terminals of the plurality of MLPEs at a first time point to disconnect the power connection between the output terminals of the plurality of MLPEs and the inverter.
  • the DC-DC converter additionally includes a third switch that is connected in parallel to the output terminal and in series with the first resistor, and operates to form a current path by operating on for a predetermined period of time from a second time point after the first time point, thereby dissipating residual power existing at the first time point, and the third switch can be operated off in the first mode.
  • a method for operating a solar power generation system wherein the first switch and the second switch of the DC-DC converter of the MLPE are controlled from a third point in time after the second point in time, and the first switch and the second switch are controlled so that the duty ratio of the DC-DC converter gradually increases.
  • the DC-DC converter includes a first switch and a second switch that are complementarily turned on or off, and the first switch and the second switch can be turned on or off to adjust the duty ratio of the DC-DC converter.
  • the operation of controlling the duty ratio of the DC-DC converter can control the duty ratio of the DC-DC converter so that the duty ratio increases to a preset value each time the duty cycle of the DC-DC converter elapses.
  • the output voltage of the PV module can decrease and the output current can increase.
  • the DC-DC converter includes a capacitor connected in parallel with both output terminals of the solar module, a first switch and a second switch connected in parallel with the capacitor, and when the first switch is turned off, the second switch is turned on to open the DC-DC converter, and when the first switch is turned on, the second switch is turned off to short-circuit both output terminals of the PV module.
  • the slope of the I-V curve can correspond to the loss of the shunt resistance in the equivalent circuit diagram of the PV module.
  • the slope of the I-V curve when the open circuit voltage becomes 0 can correspond to the loss of the series resistance in the equivalent circuit diagram of the PV module.
  • a module level power electronics (MLPE) of the solar power generation system comprising: a DC-DC converter; and a processor that controls the MLPE to perform maximum power point tracking (MPPT) control by disconnecting power from an inverter connected to an output terminal in a first mode, extract a current (I)-voltage (V) curve in a second mode, and extract the I-V curve using output voltage and output current of a PV module measured while controlling the duty ratio of the DC-DC converter in the second mode.
  • MPPT maximum power point tracking
  • the processor can control the MLPE to switch the mode of the MLPE from the first mode to the second mode at a first time point, and to open the output terminals of the plurality of MLPEs at the first time point so that the power connection between the output terminals of the plurality of MLPEs and the inverter is released.
  • the DC-DC converter may include a first switch and a second switch that complementarily turn on or off.
  • the DC-DC converter may include a third switch connected in parallel to the output terminal and operating to form a current path, and a first resistor connected in series with the third switch.
  • the processor can control the third switch to operate on in the second mode.
  • the processor can control the duty ratio of the first switch to gradually increase from 0 to 1 from a third point in time, which is a predetermined time after the second point in time when the third switch is turned on.
  • the processor can identify output power using the output voltage and output current of the PV module in the second mode, and extract a power (P)-voltage (V) curve using the output voltage and output power.
  • the processor can identify the maximum value among the identified output powers as a maximum power point (MPP).
  • MPP maximum power point
  • the processor can diagnose the status of a PV module corresponding to the I-V curve extracted based on characteristic information of the I-V curve.
  • the present invention may be characterized in that the plurality of MLPEs are connected in series with each other, and each MLPE is connected to at least one PV module among the plurality of PV modules.
  • the I-V curve of a PV module can be extracted without changing the topology of the solar power generation system, it is economical because no additional cost is incurred, and through the status diagnosis of the solar power generation system, it is possible to prevent and respond before the power generation amount of the PV module is seriously deteriorated.
  • the system efficiency can be increased by preventing a decrease in power generation in advance, and the system can be operated without additional cost, thereby creating an effect of lowering the levelized cost of energy (LCOE) from a system perspective.
  • LCOE levelized cost of energy
  • the status of a solar power generation system can be efficiently diagnosed without affecting power generation.
  • FIG. 1a and FIG. 1b are schematic diagrams illustrating an example of a solar power generation system according to one embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating the configuration of an MLPE according to one embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an operation flow diagram of an MLPE according to one embodiment of the present invention.
  • FIG. 4 is a drawing illustrating an equivalent circuit diagram of a PV module according to one embodiment of the present invention.
  • FIG. 5 is a circuit diagram illustrating a DC-DC converter according to one embodiment of the present invention.
  • FIG. 6 is a drawing illustrating a timing diagram according to one embodiment of the present invention.
  • FIGS. 7a and 7b are diagrams illustrating current-voltage curves according to one embodiment of the present invention.
  • FIG. 1a and FIG. 1b are schematic diagrams illustrating an example of a solar power generation system according to one embodiment of the present invention.
  • a solar power generation system may be configured to include a plurality of PV modules (10), an inverter (400) including a main controller (100), a plurality of MLPEs (Module Level Power Electronics) (200), and a server (300).
  • a solar power generation system may be configured to include a plurality of PV modules (10), a main controller (100), a plurality of MLPEs (Module Level Power Electronics) (200), an inverter (400), and a server (300).
  • a solar power generation system may be configured to include a main controller (100) in an inverter (400) as in FIG. 1a, or according to another embodiment, may be configured to include an inverter (400) between the main controller (100) and the grid (20) as in FIG. 1b.
  • the inverter (400) may convert direct current power generated from a plurality of PV modules (10) into alternating current power and transmit the converted alternating current power to the grid (20).
  • the main controller (100) is included in the inverter (400) as in FIG. 1a.
  • the PV modules (10) and the MLPEs (200) are separate from each other and may be configured as different types or models.
  • each of the plurality of PV modules (10) may mean a solar power generation panel in module unit.
  • the plurality of suns and panels (10) may be connected in at least one of series and parallel, and the plurality of MLPEs (200) may be provided in each of the plurality of PV modules (10).
  • one MLPE (200) may be connected to one PV module (10), and one MLPE (200) may be connected to multiple PV modules (10).
  • the MLPE (200) may transmit power generation information including power generation amount, temperature, and failure information of the PV module (10) to the master controller (100), and receive an operation command for optimizing power efficiency from the master controller (100).
  • the MLPE (200) is connected to each PV module (10) and configured to optimize the output voltage of each connected PV module (10), and may be implemented as a DC optimizer.
  • the MLPE (200) is a device that is connected to each solar panel (10) and optimizes the output power (output voltage) of each connected solar panel (10), and the MLPE (200) may optimize and output the output voltage of each connected PV module through the MPPT operation described below.
  • the MLPE (200) may analyze various data received from the PV module (10), the inverter (400), the load, the grid (20), etc., and may monitor the status of the MLPE (200) by itself, or may be monitored by the inverter (400).
  • the MLPE (200) can optimize the output voltage of each connected PV module (10) through maximum power point tracking (MPPT) control that tracks the corresponding power and voltage when the solar power generation system (1) generates maximum power.
  • MPPT maximum power point tracking
  • the MPPT operation is an algorithm implemented to continuously adjust the impedance received by a PV module (10) or an array composed of multiple PV modules (10) so that the solar power generation system (1) operates near the maximum power point when conditions such as solar irradiance, temperature, and load change.
  • the specific configuration of the MLPE (200) is described with reference to FIG. 2.
  • one group consisting of n (n is a natural number greater than or equal to 2) PV modules and n MLPEs can be configured in a form in which multiple are connected in series.
  • MLPEs (200) are provided in multiple numbers and connected in series with each other, and an inverter (400) or a main controller (100) is connected to both ends of the multiple MLPEs (200) connected in series.
  • an inverter (400) is a configuration that is installed in a PCS (Power Conversion System) to perform power conversion in order to supply power generated from a PV module (10) to a load or a grid (20).
  • the inverter (400) may be provided to include a main controller (100) as shown in FIG. 1a, or may be provided separately from the main controller (100) as shown in FIG. 1b.
  • the inverter (400) includes a main controller (100) as shown in FIG. 1a will be described, and the operation of the inverter (400) may also be understood as the operation of the main controller (100).
  • An inverter (400) analyzes various data received from a PV module (10), an MLPE (200), a load, a grid (20), etc. to monitor the operating status of a solar power generation system (1).
  • the inverter (400) also performs MPPT operation like the MLPE (200) and can maximize the power production efficiency of the solar power generation system (1).
  • the status of the MLPE (200) itself can also be diagnosed using only the MLPE (200) without any additional configuration, but the status of the PV module (10) can also be diagnosed by extracting an I-V curve based on measurements of the output voltage and output current of the PV module (10).
  • the I-V curve can appear in various forms depending on the state of the solar power generation system (1), and the characteristics according to the shape of the curve have been established through many studies. Therefore, the I-V curve is an important factor necessary for diagnosing the state of the solar power generation system (1), and according to one embodiment of the present invention, the I-V curve can be extracted by the operation of the MLPE (200), and the state of the solar power generation system (1) can be diagnosed using the extracted curve and the curve characteristics according to the shape.
  • the extracted I-V curve can be used not only for diagnosing the status of a solar power generation system (1) but also for MPPT control.
  • extraction of the I-V curve of a PV module (10) is possible without changing the topology of various MLPEs (200) constituting a solar power generation system (1), so it is economical because no additional costs are incurred.
  • the system efficiency can be increased by preventing a decrease in power generation in advance, and the system can be operated without additional cost, thereby creating an effect of lowering the levelized cost of energy (LCOE) from a system perspective.
  • LCOE levelized cost of energy
  • FIG. 2 is a block diagram illustrating the configuration of an MLPE according to one embodiment of the present invention.
  • the MLPE (200) may include a DC-DC converter (210) and a processor (220).
  • the processor (220) may include, for example, an MCU (Microcontroller Unit) for power control.
  • the processor (220) may execute software such as a program to control at least one other component (e.g., hardware or software component) of the MLPE (200) and perform various data processing or operations.
  • the processor (220) can perform serial communication with the inverter (400) or power line communication (PLC) to receive control signals required for power optimization.
  • PLC power line communication
  • the processor (220) can control the duty ratio of the DC-DC converter (210) to adjust the output voltage of the PV module (10) and the output voltage of the MLPE (200).
  • the processor (220) can control the duty ratio of the DC-DC converter (210) according to a shutdown signal to convert (regulate) the output voltage of the MLPE (200).
  • the duty ratio control of the DC-DC converter (210) can be performed directly by the processor (220) or can be performed according to a command of the main controller (100) or the inverter (400).
  • FIG. 3 is a diagram illustrating an operation flow diagram of an MLPE according to one embodiment of the present invention.
  • the processor (220) switches from a first mode for performing MPPT control by disconnecting power from an inverter (400) connected to an output terminal of the MLPE (200) to a second mode for extracting a current (I)-voltage (V) curve (S10).
  • the first mode may be a mode in which the processor (220) performs MPPT control in a general situation
  • the second mode may be a mode in which the output terminals of the plurality of MLPEs and the power connection of the inverter are disconnected to extract the output voltage and output current of each PV module connected to the plurality of MLPEs.
  • the MLPE (200) basically performs MPPT control and is electrically connected to the inverter (400) for power transmission. Meanwhile, the MLPE (200) needs to block the current flow coming from the outside in order to measure the output voltage and output current of the PV module (10). Therefore, the processor (220) disconnects the power connection with the inverter (400) in order to switch from the first mode to the second mode. The processor (220) can disconnect the power connection with the inverter (400) by opening the output terminal of the MLPE (200).
  • the processor (220) extracts an I-V curve using the measured output voltage and output current of the PV module (10) while adjusting and controlling the duty ratio of the DC-DC converter (210) in the second mode (S20).
  • the processor (220) can receive measurement values in real time according to duty ratio control and extract the I-V curve in real time.
  • the output voltage and output current of the PV module (10) can be measured according to duty ratio control and then the measurement values can be received at once to extract the I-V curve.
  • the I-V curve can be extracted by PV module unit, array unit, etc., and an example of the extracted I-V curve is illustrated in FIG. 7 below.
  • the processor (220) can diagnose the state of a PV module corresponding to an extracted I-V curve based on characteristic information of an I-V curve including characteristics according to the shape of the I-V curve.
  • the accuracy of status diagnosis is high because the actual I-V curve for each PV module is extracted.
  • the output terminal of the PV module (10) is connected to the MLPE (200).
  • the voltage (V PV ) applied to the output terminal of the PV module (10) and the current (I PV ) flowing in the output terminal can be measured by the MLPE (200).
  • the shape of the I-V curve extracted by the MLPE (200) may be affected by the shunt resistance (Rsh) and the series resistance (Rs) shown in the equivalent circuit diagram of the PV module (10). Therefore, depending on the shape of the extracted I-V curve, it is possible to check whether there is an abnormality, such as deterioration of the shunt resistance (Rsh) and the series resistance (Rs). A specific example is described with reference to FIG. 7.
  • FIG. 5 is a circuit diagram illustrating a DC-DC converter according to one embodiment of the present invention.
  • the DC-DC converter (210) includes a first switch (S1) and a second switch (S2) that operate complementarily on or off.
  • the processor (220) can control the duty ratio of the first switch (S1) to increase stepwise from 0 to 1. At this time, the processor (220) controls the second switch (S2) to operate in the opposite direction to the first switch (S1).
  • the duty ratio can be controlled to increase to a constant value for each duty cycle.
  • the processor (220) can control the first switch (S1) to gradually increase the duty ratio to a constant value in the duty cycle after the third time point (t3, the time point at which extraction of the I-V curve starts) of the second mode, which will be described later.
  • the DC-DC converter (210) further includes a third switch (S3) that is connected in parallel to the output terminal of the MLPE (200) and connected in series with the first resistor (R1) to remove residual power of the inverter (400) as needed during normal operation.
  • the third switch (S3) is turned off and does not affect the operation of the DC-DC converter (210).
  • the processor (220) turns on the third switch (S3) to consume residual power through the resistor (R1).
  • the third switch (S3) can be turned on at a second point in time (t2, the point in time when the third switch is turned on) after a predetermined time has elapsed from the first point in time (t1, the point in time when the first mode is switched to the second mode) described below to form a current path and operate so as to consume the remaining power present at the first point in time (t1).
  • the present invention utilizes the third switch (S3) provided for this function to form a current path even after the first time point (t1) when the power connection with the inverter (400) is disconnected for the second mode transition.
  • the processor (220) controls the third switch (S3) to turn on to form a current path in the second mode.
  • the third switch (S3) turns on, current flows through the PV module (10), and the voltage (VPV) and current (IPV) that change as power is consumed through the resistor (R1) can be measured.
  • the DC-DC converter circuit is not limited to that shown in Fig. 5, and it is sufficient if it can form a current path even after the inverter and power connection are disconnected, and is designed so that the output voltage of the PV module (10) is regulated according to duty ratio control.
  • an I-V curve can be extracted without additional elements such as equipment, systems, and circuits, cost reduction is possible.
  • FIG. 6 is a drawing illustrating a timing diagram according to one embodiment of the present invention.
  • the timing diagram illustrated in Fig. 6 represents, from top to bottom, the gate voltage (VGS3) of the third switch (S3), the duty (D) of the first switch (S1), the output voltage (VPV) of the PV module (10), the output current (IPV) of the PV module (10), and the power (PPV) of the PV module (10) over time.
  • the first mode according to one embodiment of the present invention may be an MPPT mode, and the second mode may be an I-V mode.
  • the third switch (S3) is turned off, and when a voltage higher than the threshold value is applied to the gate, the third switch (S3) is turned on.
  • MLPE performs MPPT control in the first mode (MPPT mode). Accordingly, the output voltage (VPV), output current (IPV), and power (PPV) of the PV module (10) are all operating at the maximum power point (MPP), and the gate voltage (VGS3) of the third switch (S3) is in an off operation at 0 V.
  • the processor (220) opens the output terminal of the MLPE (200) at a first time point (t1) to disconnect the power connection with the inverter (400), thereby switching from the first mode (MPPT mode) to the second mode (I-V Curve Extracting mode) (Output open).
  • the processor (220) controls the third switch (S3) to turn on in the second mode at the second time point (t2) to form a current path (S3 on).
  • the processor (220) sets the duty ratio of the first switch (S1) to 0 to control the first switch (S1) to turn off, and controls the second switch (S2) to turn on as a complementary operation to the first switch (S1).
  • the DC-DC converter (210) is placed in an open state.
  • the output voltage (VPV) of the PV module (10) is measured at a constant value, but the output current (IPV) becomes 0. This output voltage is called the open circuit voltage (Voc).
  • the processor (220) performs duty ratio control while gradually increasing the duty ratio of the first switch (S1).
  • the processor (220) can control the duty ratio of the DC-DC converter so that the duty ratio increases to a preset value each time the duty cycle of the DC-DC converter elapses.
  • the processor (220) does not immediately perform the duty ratio control of the DC-DC converter (210) together with the on operation control of the third switch (S3), but sets a predetermined time interval (t2 to t3).
  • the processor (220) controls the duty ratio of the DC-DC converter (210) from a point in time (hereinafter referred to as a third point in time (t3)) a predetermined time after the point in time (hereinafter referred to as a second point in time (t2)) when the third switch (S3) is turned on (Start scan).
  • a point in time hereinafter referred to as a third point in time (t3)
  • a predetermined time after the point in time hereinafter referred to as a second point in time (t2)
  • the processor (220) can control the duty ratio of the first switch (S1) to gradually increase from 0 to 1 after the third time point (t3).
  • the duty ratio of the first switch (S1) is 1, the PV module (10) is short-circuited, the output voltage (VPV) is measured as 0, and the output current (IPV) reaches a limit value. This output current is called short-circuit current (Isc).
  • the measuring device can measure the output voltage (VPV) and output current (IPV) of the PV module (10) as shown in the timing diagram of FIG. 6.
  • the processor (220) can extract an I-V curve using the measured output voltage (VPV) and output current (IPV). As described above, when receiving the output voltage (VPV) and output current (IPV) values in real time, the processor (220) can extract an I-V curve from an open circuit voltage (Voc) point to a short circuit current (Isc) point.
  • Voc open circuit voltage
  • Isc short circuit current
  • the processor (220) can track the maximum power point (MPP) using a timing diagram. Specifically, the processor (220) can identify the output power using the output voltage and output current of the PV module (10), and identify the maximum value of the identified output power as the MPP.
  • MPP maximum power point
  • FIGS. 7A and 7B are diagrams illustrating current-voltage curves according to one embodiment of the present invention.
  • the processor (220) can diagnose the state of the PV module (10) corresponding to the extracted I-V curve based on the characteristic information of the I-V curve.
  • the present invention is not limited thereto, and the processor (220) can transmit the extracted I-V curve so that an external device such as a server or a monitoring electronic device can diagnose the state of the solar power generation system (1).
  • the monitoring electronic device can be implemented as, for example, a desktop, a laptop, a smart phone, or the like.
  • Fig. 7a is an example of an I-V curve extracted according to one embodiment of the present invention.
  • an I-V curve extracted from a third time point (t3) is illustrated, and the Scan direction may mean a time-series order direction of values extracted over time.
  • the output voltage is an open circuit voltage (Voc) and the output current is 0.
  • the duty ratio of the first switch (S1) of the DC-DC converter (210) gradually increases to 1 and finally the output voltage becomes 0, the output current when the output voltage becomes 0 is a short-circuit current and the output voltage becomes 0.
  • points on the graph may be points indicating the starting point of each duty cycle.
  • the output voltage and output current values of the PV module (10) may be obtained at the starting point or the ending point of each duty cycle to extract the I-V curve.
  • the intervals between points are shown to be spaced apart for convenience of explanation, but according to an embodiment of the present invention, the duty cycle for controlling the first switch (S1) of the DC-DC converter (210) may be sufficiently short so that an I-V curve close to continuous may be extracted.
  • the characteristics of the I-V curve are as follows.
  • the slope of the I-V curve may increase near the short-circuit current (Isc), just as a leakage current path is generated. Accordingly, when the slope of the I-V curve increases near the short-circuit current (Isc) (710), it can be seen that there is an abnormality, such as deterioration, in the shunt resistance (Rsh) of the PV module (10).
  • the fill factor (FF) decreases as if the flow of current is impeded, so the slope of the curve may decrease near the open circuit voltage (Voc). Accordingly, if the slope of the curve decreases near the open circuit voltage (Voc) (720), it can be seen that there is an abnormality, such as deterioration, in the series resistance (Rs) of the PV module (10).
  • the curve factor is the value obtained by dividing the product of voltage and current (Vmpp ⁇ Impp) at the maximum power point (MPP) by the product of open circuit voltage (Voc) and short circuit current (Isc). In other words, it can also be viewed as the value obtained by dividing the area (730) by the area (740). The closer the curve factor is to 1, the better the quality of the corresponding PV module (10) can be determined. The quality, such as the lifespan or efficiency, of the PV module (10) can be determined according to the curve factor value.
  • PV modules (10) can be identified based on the shape of the I-V curve near the MPP.
  • the characteristics of the I-V curve can be revealed through continuous research, and there can be various methods of diagnosing the status of a solar power generation system using the I-V curve.
  • the processor (220) can extract a power (P)-voltage (V) curve using the output voltage and output current of the PV module (10). Specifically, the processor (220) can identify the output power using the output voltage and output current of the PV module (10), and extract the P-V curve using the identified output voltage and output power.
  • P power
  • V voltage
  • the processor (220) can identify the maximum power point using the extracted I-V curve or P-V curve, thereby enabling MPPT control.
  • various functions such as MPPT control as well as status diagnosis can be implemented through the I-V curve.
  • an active pre-diagnosis function by identifying the characteristics of a PV module through an extracted I-V curve.

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

Abstract

Selon un mode de réalisation de la présente invention, l'invention concerne un procédé de fonctionnement d'un système de génération d'énergie solaire comprenant une pluralité de dispositifs électroniques de puissance de niveau de module (MLPE), le procédé comprenant les opérations consistant à : effectuer une commande de suivi de point de puissance maximale (MPPT) dans un premier mode des dispositifs MLPE ; commuter le premier mode vers un second mode par déconnexion d'une connexion d'alimentation entre un onduleur et des bornes de sortie de la pluralité de dispositifs MLPE ; commander un rapport cyclique d'un convertisseur CC-CC situé dans les dispositifs MLPE après commutation vers le second mode; et extraire une tension de sortie et un courant de sortie de chacun des modules PV connectés à la pluralité de dispositifs MLPE dans le second mode.
PCT/KR2024/004191 2023-03-30 2024-04-01 Dispositif électronique de puissance de niveau de module, et procédé de fonctionnement de système de génération d'énergie solaire le comprenant WO2024205346A2 (fr)

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KR1020230042085A KR20240146912A (ko) 2023-03-30 2023-03-30 모듈 단위 전력 변환 장치, 이를 포함하는 태양광 발전 시스템 및 이를 이용하는 전류-전압 곡선을 추출하는 방법
KR10-2023-0042085 2023-03-30

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JP5432937B2 (ja) * 2011-02-23 2014-03-05 株式会社日立パワーソリューションズ 太陽電池特性取得回路および太陽電池制御装置
KR101398679B1 (ko) * 2013-02-25 2014-05-27 호남대학교 산학협력단 전력계통 연계형 태양전지의 전력변환 시스템
KR101741020B1 (ko) * 2016-05-30 2017-05-30 인천대학교 산학협력단 빛 에너지 하베스팅을 이용한 최대전력점 추적 제어 기능을 갖는 배터리 충전 장치
KR20200063969A (ko) * 2018-11-28 2020-06-05 한국전자통신연구원 최대 전력점 추적 제어 방법 및 장치
KR102265804B1 (ko) * 2021-03-16 2021-06-16 에스디티 주식회사 태양전지패널 개방전압 추종형 실시간 mppt 제어시스템 및 이를 이용한 태양전지패널 개방전압 추종형 실시간 mppt 제어방법

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