WO2024056155A1 - Dispositif de commande et procédé de commande d'un convertisseur de puissance - Google Patents

Dispositif de commande et procédé de commande d'un convertisseur de puissance Download PDF

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Publication number
WO2024056155A1
WO2024056155A1 PCT/EP2022/075337 EP2022075337W WO2024056155A1 WO 2024056155 A1 WO2024056155 A1 WO 2024056155A1 EP 2022075337 W EP2022075337 W EP 2022075337W WO 2024056155 A1 WO2024056155 A1 WO 2024056155A1
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WIPO (PCT)
Prior art keywords
controller
reference signal
photovoltaic panel
mode
signal
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PCT/EP2022/075337
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English (en)
Inventor
Emanuel VALLARELLA
Roland Huempfner
Zhaohui Wang
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Huawei Technologies Duesseldorf Gmbh
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Priority to PCT/EP2022/075337 priority Critical patent/WO2024056155A1/fr
Publication of WO2024056155A1 publication Critical patent/WO2024056155A1/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
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • 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
    • H02S50/15—Testing of PV devices, e.g. of PV modules or single PV cells using optical means, e.g. using electroluminescence

Definitions

  • the present disclosure relates to the field of power converters for photovoltaic (PV) panels and inspection of PV panels by photoluminescence (PL) inspection techniques.
  • the disclosure relates to a controller and corresponding method for controlling an operation of such power converter.
  • the disclosure relates to a photoluminescence-enabled smart string inverter and a corresponding method.
  • PV modules also called PV panels
  • PV modules are the components that transform sunlight into direct electrical current.
  • PV modules are steadily improved in terms of performance, materials, robustness and costs, there seems a need for investigation and inspection of already deployed PV modules in the field.
  • Photoluminescence PL which is an inspection technique that applies sunlight as excitation source and inspects the normal operation principle of a PV module, namely that it creates charge carriers by irradiation with light.
  • This disclosure provides a solution for overcoming the manual, slow and inefficient inspection techniques for changing the operating point of a PV module (or PV string) for the PL inspection.
  • the disclosure presents a solution how to fulfill the requirements to deploy the PL (Photoluminescence) inspection.
  • the concept is based on controlling two predefined electrical operating points of the PV module (or PV string) with a configurable frequency via a dedicated communication channel (e.g., RS485). Accordingly, via the interface, the electrical points of the PV module (or PV string) are triggered, such that a specially designed camera can take according pictures of the PV modules.
  • a dedicated communication channel e.g., RS485
  • the control can be performed from an external host system.
  • LC mode low current mode
  • HC mode high current mode
  • the communication is necessary to start/stop and define the operating condition (i.e., voltage/current references) of the test sequence.
  • the system can select in an autonomous way the references for HC mode, LC mode, as well as the test frequency, how long the system should stay on the HC and LC mode; all of the mentioned before can be pre-defined.
  • the control only the start and stop is needed, while this can also be operated to PV array areas in an opposite behavior, which would lead to a constant power on the output side of the converter.
  • the disclosed method can be implemented in standard power converters and string inverters. It enables PL inspection and provides a user-friendly interface for the users/customers via newly developed dedicated registers, e.g., MODBUS registers, to freely operate the method and set the two predefined electrical operating points of interest.
  • dedicated registers e.g., MODBUS registers
  • an inverter-enabled cost-effective method that brings the PV string to two fixed electrical conditions.
  • the disclosed solution allows to temporarily switch-off the normal inverter MPPT (Maximum- power-point Tracking) operation for enabling switching between two voltage levels from two electrical points of the PV string:
  • MPP Maximum-power-point
  • the disclosure presents an inverter with a Photoluminescence (PL) interface, powered by a novel method, to control two predefined electrical operating points of the PV string at an adjustable frequency, via a communication channel.
  • PL Photoluminescence
  • This disclosure presents a commercially available photoluminescence-ready inverter version for which no additional hardware is needed and a specially designed camera may be used for capturing pictures of the PV string.
  • the PL operation that powers the PL interface, can be activated and deactivated on command based on the user’s needs.
  • a newly dedicated set of registers e.g., MODBUS registers, may be used to easily control the PL operation from a user’s/customer’s perspective.
  • the PL operation can be replicated and applied to existing utility-scale inverters as they share the same architecture of DC/DC (booster) and DC/AC (inverter) converters.
  • test conditions for the sequences can be selected via communication but can also be predefined as a default.
  • the on/off triggering of a diagnostic mode can also be automatically triggered when the recording device is supporting corresponding light emitting frequency range of the PV panel.
  • the disclosed controller and method is applicable to all Smart String Inverters, power converters and power inverters, in particular to all inverters that share the same architecture which is made up of a double-stage architecture consisting of a DC/DC converter and a DC/AC converter.
  • the disclosed controller and method is not limited to such structure of a two stage PV string inverter as primarily described herein. It will also work with a single stage inverter, i.e., no DC/DC, while the inverter is designed for a wide DC input voltage range.
  • Such an electrical grid is an interconnected network for delivering or distributing electricity from producers to consumers. It may comprise generating stations that produce electric power, electrical substations for stepping electrical voltage up for transmission or down for distribution, high voltage transmission lines that carry power from distant sources to demand centers and distribution lines that connect individual customers.
  • the diagnosis method as presented in this disclosure is not really dependent on the availability of the grid, it can also be used in an off-grid system.
  • Power converters as described in this disclosure are applied for converting electric energy from one form to another, such as converting between DC and DC, e.g. between high or medium voltage DC and low voltage DC. Power converters can also change the voltage or frequency or some combination of these. Power converters are based on power electronics switches that can be actively controlled by applying ON/OFF logic (i.e., PWM operation, usually commanded by a closed loop control operation).
  • ON/OFF logic i.e., PWM operation, usually commanded by a closed loop control operation.
  • MPPT Maximum Power Point Tracking
  • PV solar systems exist in many different configurations with regard to their relationship to inverter systems, external grids, battery banks, or other electrical loads.
  • the central problem addressed by MPPT is that the efficiency of power transfer from the solar cell depends on the amount of sunlight falling on the solar panels, the temperature of the solar panel and the electrical characteristics of the load. As these conditions vary, the load characteristic that gives the highest power transfer efficiency changes. The efficiency of the system is optimized when the load characteristic changes to keep the power transfer at highest efficiency. This load characteristic is called the maximum power point (MPP).
  • MPP maximum power point
  • MPPT is the process of finding this point and keeping the load characteristic there. Electrical circuits can be designed to present arbitrary loads to the photovoltaic cells and then convert the voltage, current, or frequency to suit other devices or systems, and MPPT solves the problem of choosing the best load to be presented to the cells in order to get the most usable power out.
  • a controller or controlling device as described in this disclosure is any device that can be utilized for regulation of voltage, currents or powers of a power converter.
  • a controller or controlling device can be a single micro-controller or processor or a multi-core processor or can include a set of micro-controllers or processors or can include means for controlling and/or processing.
  • the controller can perform specific control tasks, for example controlling a converter, according to a software, hardware or firmware application.
  • the disclosure relates to a controller for controlling an operation of a power converter to operate in an operation mode for power conversion of a voltage generated by a photovoltaic panel or to operate in a diagnosis mode for an inspection of the photovoltaic panel by setting the photovoltaic panel at a first operation point for taking a first image of the photovoltaic panel or at a second operation point for taking a second image of the photovoltaic panel, the controller comprising: an interface configured to receive a mode selection signal, the mode selection signal indicating either the operation mode or the diagnosis mode of the power converter, wherein the controller is configured to set the power converter in the operation mode if the mode selection signal indicates the operation mode, or to set the power converter in the diagnosis mode, if the mode selection signal indicates the diagnosis mode.
  • the interface can be an electrical interface, for example, or a signal interface, or any kind of interface for providing the mode selection signal to the controller.
  • Such a controller provides the technical advantage that there is no need to use external components, added costly electronics and manual solutions for the PL analysis.
  • the PL function can just be enabled to any power converter or power inverter via a simple software update.
  • the interface allows a comfortable and easy setting of the controller between operation mode and diagnosis mode. Inspecting the PV modules will be cheaper and technically less complex.
  • the first operating point corresponds to a high current state of the photovoltaic panel and the second operating point corresponds to a low current state of the photovoltaic panel.
  • the high current state of the photovoltaic panel also referred to as HC operating point corresponds to a high current and low voltage of the photovoltaic panel, e.g., according to a maximum power point (MPP).
  • MPP maximum power point
  • the low current state of the photovoltaic panel also referred to as LC operating point corresponds to a low current and high voltage of the photovoltaic panel, e.g., according to an open circuit (OC) point.
  • LC operating point corresponds to a low current and high voltage of the photovoltaic panel, e.g., according to an open circuit (OC) point.
  • the first operation point enables the photovoltaic panel to generate the first image, e.g., a background image.
  • the second operation point enables the photovoltaic panel to generate the second image, e.g., an image containing a luminescence signal.
  • a difference between the first image and the second image indicates an electrical characteristic of the photovoltaic panel that is suitable for the inspection, in particular optical inspection of the photovoltaic panel.
  • the controller further comprises: a reference signal interface configured to provide a first reference signal for controlling the first operation point of the photovoltaic panel and a second reference signal for controlling the second operation point of the photovoltaic panel.
  • the first reference signal comprises a first current reference signal indicative of a first current reference value and a first voltage reference signal indicative of a first voltage reference value
  • the second reference signal comprises a second current reference signal indicative of a second current reference value and a second voltage reference signal indicative of a second voltage reference value
  • the controller can temporarily switch-off the normal inverter’s MPPT operation to enable the switching between two voltage levels from two electrical points of the PV string.
  • the reference signal interface is configured to switch between providing the first reference signal and the second reference signal.
  • the reference signal interface is configured to receive a reference control signal, the reference control signal indicating either the provision of the first reference signal or the provision of the second reference signal, wherein the reference signal interface is configured to provide the first reference signal if the reference control signal indicates the provision of the first reference signal, or to provide the second reference signal if the reference control signal indicates the provision of the second reference signal.
  • the reference signal interface can be easily controlled by the reference control signal which can be provided from outside the controller or by a suitable PL method controlling the switching between the two operating points.
  • the reference control signal comprises a clock signal having a first state and a second state, wherein the first state indicates the provision of the first reference signal and the second state indicates the provision of the second reference signal.
  • clock signal can be flexible designed in order to define the switching period between the first and second operating points.
  • a frequency, by which the clock signal switches between the first state and the second state is configurable.
  • This provides the advantage that the switching period between the first and second operating points can be easily designed by a respective frequency of the clock signal.
  • the frequency configuration of the clock signal is based on a photoluminescence control scheme for controlling a switching between the first operation point and the second operation point of the photovoltaic panel.
  • the controller comprises: a communication channel configured to receive the reference control signal.
  • the reference control signal can be easily provided to the controller from an external device by a communication channel, for example an external device on which the PL method is implemented.
  • the communication channel is further configured to receive the mode selection signal.
  • the communication channel comprises an RS485 serial communication interface.
  • serial communication interface is a standard interface which can be easily implemented and integrated with the controller software.
  • the controller is configured to provide, in the diagnosis mode of the power converter, a current reference value for a current control stage of the controller, based on the first reference signal and the second reference signal.
  • the controller is configured to provide, in the diagnosis mode of the power converter, the current reference value based on a difference of the first voltage reference signal and the voltage generated by the photovoltaic panel or based on a difference of the second voltage reference signal and the voltage generated by the photovoltaic panel.
  • each point HC and LC is referred to by a preset voltage and current reference.
  • one point can be enough.
  • this one point can even be automatically chosen by the system itself.
  • the implementation suggested above provides only one way to optimize the transition from HC to LC point without restricting the manner this transition can be performed. It understands that a variety of different transition methods can be applied as well.
  • the controller is configured to provide, in the diagnosis mode of the power converter, the current reference value based on a control transfer function with respect to the first voltage reference signal, the second voltage reference signal and the voltage generated by the photovoltaic panel.
  • the controller is configured to perform, in the operation mode of the power converter, voltage control based on Maximum Power Point Tracking.
  • controller can efficiently switch between the operation mode, i.e., normal operation in which optimal voltage control can be performed based on MPPT and the diagnosis mode in which efficient inspection of the PV panels can be performed.
  • the disclosure relates to a method for controlling an operation of a power converter to operate in an operation mode for power conversion of a voltage generated by a photovoltaic panel or to operate in a diagnosis mode for an inspection of the photovoltaic panel by setting the photovoltaic panel at a first operation point for taking a first image of the photovoltaic panel or at a second operation point for taking a second image of the photovoltaic panel, the method comprising: receiving, by an interface, a mode selection signal, the mode selection signal indicating either the operation mode or the diagnosis mode of the power converter; and setting the power converter in the operation mode if the mode selection signal indicates the operation mode; or setting the power converter in the diagnosis mode if the mode selection signal indicates the diagnosis mode.
  • the same technical advantages also apply for this method, i.e., there is no need to use external components, added costly electronics and manual solutions for the PL analysis.
  • the PL function can just be enabled to any power converter or power inverter via a simple software update.
  • the interface allows a comfortable and easy setting of the controller between operation mode and diagnosis mode. Inspecting the PV modules will be cheaper and technically less complex.
  • the disclosure relates to a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the method according to the second aspect described above.
  • the computer program product may run on a controller for controlling the above-described power converter, e.g., a controller as shown in Figure 1.
  • the disclosure relates to a computer-readable medium, storing instructions that, when executed by a computer, cause the computer to execute the method according to the second aspect described above.
  • a computer readable medium may be a non-transient readable storage medium.
  • the instructions stored on the computer-readable medium may be executed by the controller as described in Figure 1 .
  • the solution described in this disclosure presents an inverter-integrated PL function to set the PV module (or PV string) at two predefined electrical operating points. These points are the requirement for the PL analysis. By using that inverter-integrated PL function there is no need to use external components, to add costly electronics and manual solutions for the PL analysis.
  • the disclosed method works for all kind of inverter structures.
  • the PL function can just be enabled via a simple software update of the controller software.
  • the solution is almost at zero cost (i.e., technical complexity) and inspection of the PV modules will be cheaper compared to existing solutions.
  • inverter and inverter solutions referring in technical terms to DC/AC converter for the power electronics supporting the operation point HC - LC toggling.
  • the solution described in this disclosure is not restricted to such inverter or inverter solution.
  • a power converter or power converter solution can be applied, e.g., a power converter that can feed directly into DC, such as PV systems with DC coupled battery storage systems.
  • Figure 1 shows a block diagram illustrating an exemplary system architecture for power conversion based on PV modules by using a power converter 120 and a controller 140 according to the disclosure for controlling the power converter 120;
  • Figure 2 shows a performance diagram of a PV module showing the two operating points of the PV panels.
  • Figure 3 shows a schematic diagram illustrating a method 300 for controlling an operation of a power converter according to the disclosure.
  • Figure 1 shows a block diagram illustrating an exemplary system architecture 100 for power conversion based on PV modules 110 by using a power converter 120 and a controller 140 according to the disclosure for controlling the power converter 120.
  • a PL method is shown with respect to the overall structure of a power conversion system 100 based on PV modules 110.
  • the power conversion system 100 comprises a plurality of PV modules or PV panels 110 which provide electrical energy from solar energy.
  • the PV panels 110 generate an actual string voltage 111 in the form of a DC voltage which is converted by the power converter 120 into AC power for supplying an electrical grid 130, i.e., an electrical power network.
  • the power converter 120 is controlled by a controller 140.
  • the power converter 120 comprises a sequential stage of a DC/DC converter 121 receiving the string voltage 111 of the PV panels 110 and a DC/AC converter 123 converting DC energy into AC energy for the electrical grid 130.
  • a DC link 122 is arranged between the DC/DC converter 121 and the DC/AC converter 123 and filters 124 are arranged between the DC/AC converter 123 and the electrical grid 130.
  • the controller 140 controls the power converter 120 by corresponding control signals, e.g., PWM signals.
  • the controller 140 comprises a first functional block 140a and a second functional block 140b.
  • the solution described in this disclosure relates to an inverter’s or power converter’s 140 interface to control two predefined electrical operating points of the PV string with configurable frequency via a communication channel (e.g. RS485).
  • a communication channel e.g. RS485
  • This interface is powered by a novel method that triggers electrical points of the PV strings 110.
  • This novel method is depicted in Figure 1 , and it can be seen how it interacts with the power converter, e.g., smart string inverter.
  • the architecture of the power converter 120 which is based upon receiving the direct power from the PV modules or panels 110 and transforming this into alternating power for the electrical grid 130, is depicted.
  • the disclosed PL method shown in the second functional block 140b of the controller 140 is then compared to the standard MPPT operation shown in the first functional block 140a of the controller 140.
  • the power converter 120 uses the "MPPT operation” 141 (“Normal Mode” 151) to control the DC/DC converter 121 which is one of the first building block of the overall inverter or power converter 120 as shown in the top of Figure 1. This operation in the normal mode 151 is implemented by the first functional block 140a of the controller 140.
  • a novel method is disclosed in order to perform the PL diagnosis.
  • This method is implemented by the second functional block 140b of the controller 140 as shown in Figure 1 when the power converter is in the “diagnosis mode” or “PL diagnosis” 152.
  • the main idea behind this disclosure is the usage of this PL method to temporarily stop the "Normal Mode” 151 of the MPPT operation and give voltage and current references to the controller 140 in the PL diagnosis 152 mode.
  • Once the "PL diagnosis” 152 is chosen over the "Normal Mode” 151 four possible current and voltage references can be given to the controller 140 to achieve the two electrical operating points, as illustrated in Figure 2:
  • LC operating point 202 low-current and high-voltage (e.g., open-circuit (OC) point)
  • HC operating point 201 high-current and low-voltage (e.g., maximum power point (MPP) point).
  • MPP maximum power point
  • the "PL diagnosis” mode 152 can be set according to these references that control the electrical operating points 201 , 202 of the PV module I PV string 110. Such references follow also a predefined and independent timing ("clock generation”).
  • the PV module (or PV string) 110 can be set to the two specific operating points 201 , 202 for the PL analysis. Once such analysis is complete, the power converter 120 goes back to the "Normal mode” 151.
  • controller 140 functionality of the controller 140 is described in detail.
  • the controller 140 is used for controlling an operation of the power converter 120 to operate in an operation mode 151 (also called normal mode) for power conversion of a voltage 111 generated by a photovoltaic panel 110 or to operate in a diagnosis mode 152 (also called PL diagnosis) for an inspection of the photovoltaic panel 110 by setting the photovoltaic panel 110 at a first operation point 201 for taking a first image of the photovoltaic panel 110 or at a second operation point 202 for taking a second image of the photovoltaic panel 110, e.g., as shown in Figure 2.
  • an operation mode 151 also called normal mode
  • diagnosis mode 152 also called PL diagnosis
  • the controller (140) comprises an interface 150 (or signal interface) configured to receive a mode selection signal 153.
  • the mode selection signal 153 indicates either the operation mode 151 (i.e., normal mode) or the diagnosis mode 152 (i.e. PL diagnosis) of the power converter 120.
  • the controller 140 is configured to set the power converter 120 in the operation mode 151 if the mode selection signal 153 indicates the operation mode 151 , or to set the power converter 120 in the diagnosis mode 152, if the mode selection signal indicates the diagnosis mode 152.
  • the interface 150 can be an electrical interface, for example, or a signal interface, or any kind of interface for providing the mode selection signal 153 to the controller 140.
  • the first operating point 201 may correspond to a high current state of the photovoltaic panel 110, e.g., as illustrated in Figure 2.
  • the second operating point 202 may correspond to a low current state of the photovoltaic panel 110, e.g., as illustrated in Figure 2.
  • the high current state of the photovoltaic panel also referred to as HC operating point corresponds to a high current and low voltage of the photovoltaic panel 110, e.g., according to a maximum power point MPP.
  • the low current state of the photovoltaic panel 110 also referred to as LC operating point corresponds to a low current and high voltage of the photovoltaic panel 110, e.g., according to an open circuit (OC) point.
  • LC operating point corresponds to a low current and high voltage of the photovoltaic panel 110, e.g., according to an open circuit (OC) point.
  • the controller 140 further comprises a reference signal interface 156 configured to provide a first reference signal 154a, 154b for controlling the first operation point 201 of the photovoltaic panel 110 and a second reference signal 155a, 155b for controlling the second operation point 202 of the photovoltaic panel 110.
  • the first operation point 201 enables the photovoltaic panel 110 to generate the first image, e.g., a background image, e.g., as described below with respect to Figure 2.
  • the second operation point 202 enables the photovoltaic panel 110 to generate the second image, e.g., an image containing a luminescence signal, e.g., as described below with respect to Figure 2.
  • a difference between the first image and the second image indicates an electrical characteristic of the photovoltaic panel 110 that is suitable for the inspection, in particular optical inspection of the photovoltaic panel 110.
  • the first reference signal 154a, 154b may comprise a first current reference signal 154a indicative of a first current reference value and a first voltage reference signal 154b indicative of a first voltage reference value.
  • the second reference signal 155a, 155b may comprise a second current reference signal 155a indicative of a second current reference value and a second voltage reference signal 155b indicative of a second voltage reference value.
  • the reference signal interface 156 may be configured to switch between providing the first reference signal 154a, 154b and the second reference signal 155a, 155b.
  • the above-described examples refer to a voltage and current reference for each point.
  • the system can work either with a voltage or a current reference on each of the operating points HC and LC, which may also be chosen from automatically derived references.
  • each point HC and LC can be referred to by a preset voltage and current reference. Automatically derived references are easy to implement while direct references offer more flexibility.
  • the reference signal interface 156 may be configured to receive a reference control signal 159 which indicates either the provision of the first reference signal 154a, 154b or the provision of the second reference signal 155a, 155b.
  • the reference signal interface 156 may be configured to provide the first reference signal 154a, 154b if the reference control signal 159 indicates the provision of the first reference signal 154a, 154b, or to provide the second reference signal 155a, 155b if the reference control signal 159 indicates the provision of the second reference signal 155a, 155b.
  • the reference control signal 159 may comprise, for example, a clock signal having a first state and a second state, wherein the first state indicates the provision of the first reference signal 154a, 154b and the second state indicates the provision of the second reference signal 155a, 155b.
  • the system can work either with a voltage or a current reference on each of the operating points HC and LC, which may also be chosen from automatically derived references.
  • Each point HC and LC can be referred to by a preset voltage and current reference. This does not exclude an operation of the system where only one reference per point can be used or the references can be selected in an automatic way.
  • a frequency by which the clock signal switches between the first state and the second state may be configurable.
  • the frequency configuration of the clock signal may be based on a photoluminescence control scheme for controlling a switching between the first operation point 201 and the second operation point 202 of the photovoltaic panel 110.
  • a photoluminescence control scheme for controlling a switching between the first operation point 201 and the second operation point 202 of the photovoltaic panel 110.
  • the controller 140 may comprise a communication channel configured to receive the reference control signal 159.
  • the communication channel may be further configured to also receive the mode selection signal 153 for switching between the operation mode 151 and the diagnosis mode 152.
  • the communication channel may comprise or may be implemented as an RS485 serial communication interface.
  • the controller 140 may be configured to provide, in the diagnosis mode 152 of the power converter 120, a current reference value 143 for a current control stage 145 of the controller 140, based on the first reference signal 154a, 154b and the second reference signal 155a, 155b as shown in the second functional block 140b of the controller 140.
  • the controller 140 may be configured to provide, in the diagnosis mode 152 of the power converter 120, the current reference value 143 based on a difference of the first voltage reference signal 154b and the voltage 111 generated by the photovoltaic panel 110 or based on a difference of the second voltage reference signal 155b and the voltage 111 generated by the photovoltaic panel 110.
  • the controller 140 may be configured to provide, in the diagnosis mode 152 of the power converter 120, the current reference value 143 based on a control transfer function 157 with respect to the first voltage reference signal 154b, the second voltage reference signal 155b and the voltage 111 generated by the photovoltaic panel 110.
  • the controller 140 may be configured to perform, in the operation mode 151 of the power converter 120, voltage control 142 based on Maximum Power Point Tracking 141.
  • Figure 2 shows a performance diagram 200 of a PV module showing the two operating points 201 , 202 of the PV panels 110.
  • the PL techniques exploits the luminescence signal created by recombination of carriers in the silicon (Si).
  • Si an indirect semiconductor
  • the share of radiative band-to-band recombination is low compared to other recombination processes. Nevertheless, if triggered, enough light is emitted to create an image about the conductive properties of solar cells made of Si. The latter gives knowledge about the performance and reliability of the solar cells (which make up a PV module).
  • the PL methodology works by setting the PV module or PV panels 110 as shown in Figure 1 at two different operating points 201 , 202 as can be seen in Figure 2, thus having two different images that can be taken each at their specific operating points.
  • a PV module such as the PV panels 110 shown in Figure 1
  • OC open-circuit
  • LC low-current
  • this operating point 201 is also called high-current (HC) state
  • HC high-current
  • the different pictures can be taken, e.g., by using a specifically designed camera.
  • Figure 3 shows a schematic diagram illustrating a method 300 for controlling an operation of a power converter according to the disclosure, e.g., the power converter 120 shown in Figure 1.
  • the method 300 can be used for controlling an operation of a power converter 120 to operate in an operation mode 151 for power conversion of a voltage 111 generated by a photovoltaic panel 110 or to operate in a diagnosis mode 152 for an inspection of the photovoltaic panel 110 by setting the photovoltaic panel 110 at a first operation point 201 (see Figure 2) for taking a first image of the photovoltaic panel 110 or at a second operation point 202 for taking a second image of the photovoltaic panel 110, e.g., as described above with respect to Figure 1.
  • the method 300 comprises: receiving 301 , by an interface 150, a mode selection signal 153, the mode selection signal 153 indicating either the operation mode 151 or the diagnosis mode 152 of the power converter 120, e.g., as described above with respect to Figure 1.
  • the method 300 comprises: setting 302 the power converter 120 in the operation mode 151 if the mode selection signal 153 indicates the operation mode 151 ; or setting the power converter 120 in the diagnosis mode 152 if the mode selection signal 153 indicates the diagnosis mode 152, e.g., as described above with respect to Figure 1.
  • the method 300 can be performed by a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the method 300.
  • the computer program product may run on a controller for controlling the above-described power converter 120, e.g., a controller 140 as shown in Figure 1.

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Abstract

La présente divulgation se rapporte à un dispositif de commande (140) permettant de commander le fonctionnement d'un convertisseur de puissance (120) pour fonctionner dans un mode de fonctionnement (151) pour la conversion de puissance d'une tension (111) générée par un panneau photovoltaïque (110) ou pour fonctionner dans un mode de diagnostic (152) pour une inspection du panneau photovoltaïque par le réglage du panneau photovoltaïque au niveau d'un premier point de fonctionnement (201) afin de prélever une première image du panneau photovoltaïque ou au niveau d'un second point de fonctionnement (202) afin de prélever une seconde image du panneau photovoltaïque, le dispositif de commande comprenant : une interface (150) configurée pour recevoir un signal de sélection de mode (153), le signal de sélection de mode indiquant le mode fonctionnement ou le mode diagnostic du convertisseur de puissance, le dispositif de commande étant configuré pour régler le convertisseur de puissance dans le mode fonctionnement si le signal de sélection de mode indique le mode fonctionnement, ou pour régler le convertisseur de puissance dans le mode diagnostic, si le signal de sélection de mode indique le mode diagnostic.
PCT/EP2022/075337 2022-09-13 2022-09-13 Dispositif de commande et procédé de commande d'un convertisseur de puissance WO2024056155A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160226252A1 (en) * 2015-02-02 2016-08-04 Technology Research, Llc Interface for renewable energy system
EP3447908A1 (fr) * 2017-08-25 2019-02-27 Electricité de France Procede d'analyse quantitative d'une installation comprenant un module electroluminescent

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160226252A1 (en) * 2015-02-02 2016-08-04 Technology Research, Llc Interface for renewable energy system
EP3447908A1 (fr) * 2017-08-25 2019-02-27 Electricité de France Procede d'analyse quantitative d'une installation comprenant un module electroluminescent

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