Solar power generation system and operating method thereof

Abstract

The present invention relates to a solar power generation system and an operating method thereof. The solar power generation system according to the present embodiment may comprise a module level power electronics (MLPE) device connected to a solar module so as to optimize the output power source of the solar module, wherein the MLPE device includes: an RSD module for rapidly shutting down the output power source of the solar module from being output to a power conversion unit which converts the power source optimized by the MLPE device into a power source that can be supplied to a load and a system or converts a power source supplied from the system into a power source that can be stored in a battery; and a processor which monitors the state of the solar module so as to control that the output power source of the solar module is optimized, and which dynamically controls an RSD function of the RSD module in correspondence to an initial driving time of the MLPE device and a control signal of the power conversion unit.

Description

Solar power generation system and its operating method

[0001] The present invention relates to a solar power generation system and an operating method thereof.

[0002] In existing solar power systems, the rapid shutdown function of MLPE devices has made it impossible to utilize the sunlight backup function to meet household loads or charge batteries during grid outages or battery overdischarges. While the rapid shutdown function is used to cut power to solar panels to ensure the safety of firefighters and installers, it also prevents solar power systems from delivering power when needed.

[0003] The background technology described above is technical information that the inventor possessed for the purpose of deriving the present invention or acquired in the process of deriving the present invention, and cannot necessarily be considered as publicly known technology disclosed to the general public prior to the application for the present invention.

[0004] Prior art document: Korean Patent Publication No. 10-2016-0001249 (January 6, 2016)

[0005] One object of the present invention is to enable a solar power generation system to continuously supply solar power without being shut down even in a situation of a power outage in the system or over-discharge of a battery.

[0006] The problems addressed by the present invention are not limited to those mentioned above. Other problems and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through embodiments of the present invention. Furthermore, it will be appreciated that the problems and advantages addressed by the present invention can be realized by the means and combinations thereof set forth in the claims.

[0007] A solar power generation system according to the present embodiment includes a solar module and an MLPE (module level power electronics) device connected to the solar module to optimize the output power of the solar module, and the MLPE device may include an RSD module for rapidly shutting down the output power of the solar module from being output to a power conversion unit that converts the optimized power from the MLPE device into power that can be supplied to a load and a grid or converts power supplied from the grid into power that can be stored in a battery, and a processor that monitors the status of the solar module to control the output power of the solar module to be optimized, and dynamically controls an RSD function of the RSD module in response to an initial operation time of the MLPE device and a control signal of the power conversion unit.

[0008] A method of operating a solar power generation system according to the present embodiment is a method of operating a solar power generation system including a solar module and an MLPE (module level power electronics) device connected to the solar module to optimize the output power of the solar module, the method including: a step of allowing the MLPE device to monitor the status of the solar module and control the output power of the solar module to be optimized; and a step of dynamically controlling an RSD function of an RSD module to rapidly shut down the output power of the solar module from being output to the power conversion unit in response to an initial operation time and a control signal of a power conversion unit that converts the optimized power from the MLPE device into power that can be supplied to a load and a grid or converts power supplied from the grid into power that can be stored in a battery.

[0009] In addition, other methods for implementing the present invention, other systems, and computer-readable recording media storing a computer program for executing the method may be further provided.

[0010] Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims and detailed description of the invention.

[0011] According to the present invention, even in situations of a power outage or battery over-discharge that could not be handled when the MLPE device was installed, the solar power generation system is not shut down and continues to supply solar power, thereby maintaining the stability of the MLPE device and increasing the efficiency of solar power generation.

[0012] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0013] Figure 1 is an exemplary diagram of a solar power generation system according to the present embodiment.

[0014] Figure 2 is a detailed drawing of a string in the solar power generation system illustrated in Figure 1.

[0015] FIG. 3 is a block diagram schematically illustrating the configuration of an MLPE device according to one embodiment.

[0016] FIG. 4 is a waveform diagram illustrating the operation of the MLPE device illustrated in FIG. 3.

[0017] FIG. 5 is a block diagram schematically illustrating the configuration of an MLPE device according to another embodiment.

[0018] Figures 6 and 7 are flowcharts for explaining the operation method of the solar power generation system according to the present embodiment.

[0019] Figures 8 and 9 are exemplary diagrams for explaining the operation method of the solar power generation system of Figure 7.

[0020] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments presented below, but may be implemented in various different forms, and it should be understood that it includes all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. The embodiments presented below are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. In describing the present invention, if a detailed description of a related known technology is judged to obscure the gist of the present invention, the detailed description thereof will be omitted.

[0021] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used solely for the purpose of distinguishing one component from another.

[0022] Additionally, in the present application, a “part” may be a hardware component such as a processor or circuit, and / or a software component executed by a hardware component such as a processor.

[0023] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are assigned the same drawing numbers, and redundant descriptions thereof will be omitted.

[0024] In the following examples, the terms first, second, etc. are not used in a limiting sense, but are used for the purpose of distinguishing one component from another.

[0025] In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0026] In the following examples, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not preclude the possibility that one or more other features or components may be added.

[0027] In some embodiments, where the implementation is otherwise feasible, a particular process sequence may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0028] FIG. 1 is an exemplary diagram of a solar power generation system according to the present embodiment, and FIG. 2 is a detailed diagram of a string in the solar power generation system illustrated in FIG. 1. Referring to FIGS. 1 and 2, the solar power generation system may include a string (100), a battery (200), a power conversion unit (300), a load (400), and a system (500).

[0029] A string (100) may be configured by connecting multiple solar modules (110) in series via power lines. For example, multiple strings (100) may be connected in parallel to each other.

[0030] A solar module (110) is a unit made up of a collection of PV (photovoltaic) cells (111), and can directly convert sunlight (light energy) into electrical energy (direct current, DC). A solar module (110) is configured by connecting a plurality of such PV cells (111), and the voltage and current output of the system can be adjusted depending on the connection method (series or parallel).

[0031] The MLPE device (120) performs an optimization function for maximum power production, and monitors the status of the solar module (110) and provides it to the power conversion unit (300), and can perform optimization according to the control of the power conversion unit (300). Here, monitoring the status of the solar module (110) may include monitoring the status of a plurality of PV cells (111) included in the solar module (110).

[0032] The MLPE device (120) is a device for the purpose of increasing the efficiency of DC power generated from a solar module (110), and can block or supply power to an inverter (330) through control. In addition, the MLPE device (120) can perform a quick blocking function to lower the output of the MLPE device (120) below a certain voltage for a certain period of time.

[0033] The MLPE device (120) can optimize and monitor the performance of a solar module (110). The maximum power points of the plurality of PV cells (111) included in the solar module (110) may vary depending on the amount of sunlight, temperature, etc. The MLPE device (120) can perform maximum power point tracking (MPPT) control on a module-by-module basis to operate the solar module (110) at the maximum power point.

[0034] In the present embodiment, the MLPE device (120) may be replaced with an optimizer (not shown) or a micro inverter (not shown). As an example, when the MLPE device (120) is an optimizer, the optimizer can control the power generated by the solar module (110) and output it to the inverter (330). The current converted (e.g., converted from direct current to alternating current) by the inverter (330) can be output to the load (400) or the grid (500). As another example, when the MLPE device (120) is a micro inverter, the micro inverter can convert the power generated by the solar module (110). The power converted by the micro inverter can be output to the load (400) or the grid (500). In this embodiment, for the convenience of explanation, an example will be given in which the MLPE device (120) is in the form of an optimizer.

[0035] The battery (200) can store the output power of the solar module (110) optimized by the MLPE device (120). Here, storing the output power of the solar module (110) may include storing power output from a plurality of PV cells (111).

[0036] The power conversion unit (300) converts the output power (source power, direct current, DC) of the solar module (110) optimized by the MLPE device (120) into AC power (AC power) and supplies it to the load (400), and adjusts the converted AC power to match the voltage and frequency of the power grid and supplies it to the grid (500). In addition, the power conversion unit (300) can convert AC power supplied from the grid (500) into DC power and store it in the battery (200).

[0037] In this embodiment, the power conversion unit (300) may include a PLC communication unit (310), a converter (320), an inverter (330), and a control unit (340).

[0038] The PLC communication unit (310) can supply the output power of the solar module (110) optimized by the MLPE device (120) to the inverter (330) through boosting of the converter (320). This can be applied when the solar power generation system is operated independently in a state separated from the grid (500) (e.g., when a power outage occurs). In addition, the PLC communication unit (310) can supply AC power supplied from the grid (500) to the inverter (330).

[0039] In this embodiment, the PLC communication unit (310) can operate when the output power of the solar module (110) is supplied to the inverter (330) or AC power is supplied to the inverter (330) from the system (500). The PLC communication unit (310) cannot operate when the output power of the solar module (110) is not supplied to the inverter (330) or AC power is not supplied to the inverter (330) from the system (500).

[0040] The converter (320) can boost the output power of the solar module (110) optimized by the MLPE device (120) or the output power stored in the battery (200). The converter (320) can be installed in front of the inverter (330) and boost the DC power input to the inverter (330). The converter (320) can include, for example, a boost converter, but is not limited thereto.

[0041] The inverter (330) can convert the DC power boosted by the converter (320) into AC power and supply it to the load (400) and the grid (500). In addition, the inverter (330) can convert the AC power supplied from the grid (500) into DC power and store it in the battery (200).

[0042] The control unit (340) can receive monitoring information detected from the MLPE device (120) and control the operation of the PLC communication unit (310), converter (320), and inverter (330).

[0043] In a system (500) connected solar power generation system, if a power outage occurs in the system (500) and over-discharge of the battery (200), power is not supplied to the inverter (330), and the RSD function, which rapidly cuts off solar power generation in an emergency, may be deactivated. This may be because the MLPE device (120) receives an RSD operation control signal from the inverter (330) and turns the RSD function on and off. As the inverter (330) is deactivated due to a power outage in the system (500) and over-discharge of the battery (200), the solar power generation system may cut off power supply to the load (400) without being connected to the system (500).

[0044] The MLPE device (120) includes an RSD function to satisfy the National Electrical Code (NEC) regulations, and the RSD function can be set as a priority function for solar power generation to safely block solar power. When the solar power rises in the morning and the MLPE device (120) starts initial operation, the RSD module (122 in FIG. 3) can first activate the RSD function to block the solar power generation. This may be to quickly disable the solar power generation system in accordance with fire safety regulations, etc., to quickly respond to safety issues.

[0045] If the MLPE device (120) does not receive a signal from the inverter (330) to deactivate the RSD function, the RSD function may remain activated, thereby blocking solar power generation. Accordingly, in a state of power outage in the system (500) and over-discharge of the battery (200), the sunlight backup function corresponding to the load (400) through solar power generation may be lost.

[0046] In the event of a power outage in the system (500) and over-discharge of the battery (200), if the amount of solar radiation is insufficient, the solar power generation system may be shut down. At this time, when the amount of solar radiation increases, such as at sunrise, and solar power is generated, the MLPE device (1200) may not be able to transmit solar power to the inverter (330) through the MLPE device (120) because the RSD function remains activated. In this case, the MLPE device (120) may not be able to transmit an RSD release signal, and a situation may occur in which solar power cannot be used until the system (500) is connected.

[0047] In order to solve these problems, the present embodiment can enable the MLPE device (120) to continuously supply solar power without the solar power generation system being shut down even in a power outage of the system (500) and an over-discharge of the battery (200).

[0048] FIG. 3 is a block diagram schematically illustrating the configuration of an MLPE device according to an embodiment. In the following description, any part that overlaps with the descriptions of FIGS. 1 and 2 will be omitted. Referring to FIG. 3, an MLPE device (120) according to an embodiment may include a monitoring unit (121), an RSD module (122), a communication unit (123), and a processor (124).

[0049] The monitoring unit (121) can generate monitoring information including information such as voltage, current, temperature, and power generation of the solar module (110).

[0050] The RSD module (122) can perform an RSD function to rapidly shut down the output power of the solar module (110) from being output to the power conversion unit (300). In the present embodiment, the on / off of the RSD module (122) can be controlled by the processor (124). In the present embodiment, turning on the RSD module (122) may include that the RSD function has been activated, and turning off the RSD module (122) may include that the RSD function has been deactivated.

[0051] The communication unit (123) can transmit monitoring information to the processor (124). The communication unit (123) can perform various types of communication with the processor (124), and for example, can use a serial communication method in addition to power line communication.

[0052] The processor (124) can receive monitoring information from the monitoring unit (121) and control the output power of the solar module (110) to be optimized. The processor (124) can dynamically control the RSD function of the RSD module (122) in response to the initial operating time of the MLPE device (120) and the control signal of the power conversion unit (300) while being separated from the system (500).

[0053] The processor (124) may disable the RSD function of the RSD module (122) for a first time as the initial operation of the MLPE device (120) begins. When the RSD function of the RSD module (122) is disabled, the output power of the solar module (110) is transmitted to the power conversion unit (300), and the converter (320, for example, a boost converter) provided in the power conversion unit (300) may be boosted. The inverter (330) may start operating by the boosting power (DC power) of the converter (320) and may convert the boosting power of the converter (320) into AC power.

[0054] In this embodiment, a link capacitor (not shown) is provided in front of the converter (320), and the link capacitor can be charged with the output power of the solar module (110). When the charging voltage of the link capacitor reaches the operating range, the converter (320) is boosted, and the boosted power can be input to the inverter (330) and converted into AC power.

[0055] The processor (124) can control the RSD function of the RSD module in response to an RSD operation control signal received from the power conversion unit (300) within a second time period after the initial operation of the MLPE device (120) has started, i.e., after the first time period has elapsed. The processor (124) can maintain the release of the RSD function of the RSD module (122) by receiving the RSD operation control signal from the power conversion unit (300) within the second time period. The processor (124) can activate the RSD function of the RSD module (122) by not receiving the RSD operation control signal from the power conversion unit (300) within the second time period.

[0056] In this embodiment, the first time period may be longer than the second time period. Similarly, the second time period may be shorter than the first time period. Furthermore, the sum of the first time period and the second time period may be within a preset time period (e.g., 10 seconds). Accordingly, the first time period may be, for example, within 6 seconds, but is not limited thereto. The second time period may be, for example, within 4 seconds, but is not limited thereto.

[0057] The processor (124) may be implemented as a central processing unit (CPU), a graphics processing unit (GPU), an application processor (AP), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP) provided in the MLPE device (120), but is not limited thereto.

[0058] Fig. 4 is a waveform diagram illustrating the operation of the MLPE device illustrated in Fig. 3. In the following description, any part that overlaps with the description of Figs. 1 to 3 will be omitted. Fig. 4 specifically illustrates an output-side voltage-time waveform diagram of the MLPE device (120). Referring to Fig. 4, in the output-side voltage-time waveform diagram of the MLPE device (120), the horizontal axis may represent time (s) and the vertical axis may represent voltage (V).

[0059] As the MLPE device (120) is initially powered up when the sun rises in the morning, the processor (124) disables the RSD function for a first time, so that the output power of the MLPE device (120) can be charged to the link capacitor. When the charging voltage reaches the operating range, the link capacitor begins to discharge, and the inverter (330) can be operated by boosting the converter (320) with this discharge voltage.

[0060] The specific safety standard of the Canadian Standards Association (CSA) is designed to ensure that the time for activating the RSD function is within 10 seconds. Since the on / off time is different for each MLPE device (120), if the output of the MLPE device (120) is maintained for the sum of the first time and the second time during which the inverter (330) can operate by boosting the converter (320), an RSD operation control signal (a signal for deactivating the RSD function) can be transmitted to the MLPE device (120) through the PLC communication unit (310).

[0061] In the present embodiment, the first time period may include a time period during which the link capacitor begins to charge and reaches the operating range, and then the switched-mode power supply (SMPS) of the converter (320) discharges to the minimum operating voltage. During the first time period, the SMPS of the converter (320) may be in an ON state. In addition, the second time period may include a time period within 10 seconds from the time period during which the SMPS of the converter (320) discharges below the minimum operating voltage until the RSD function of the CSA standard is activated. During the second time period, the SMPS of the converter (320) may be in an OFF state.

[0062] The MLPE device (120) can release the RSD function upon receiving the RSD operation control signal and transmit the output power of the MLPE device (120) to the power conversion unit (300). The converter (320) of the power conversion unit (300) can boost the output power to charge the battery (200) or input the converted AC power to the inverter (330) to supply the load (400) and the system (500).

[0063] FIG. 5 is a block diagram schematically illustrating a configuration of an MLPE device according to another embodiment. In the following description, any part that overlaps with the description of FIGS. 1 to 4 will be omitted. Referring to FIG. 5, an MLPE device (120) according to another embodiment may include a monitoring unit (121), an RSD module (122), a communication unit (123), a processor (124), and an MPPT control unit (125). In the present embodiment, the operations of the monitoring unit (121), the RSD module (122), the communication unit (123), and the processor (124) are the same as those described above, and therefore will be omitted.

[0064] The MPPT control unit (125) can optimize the output voltage of the connected solar modules (110) through maximum power point tracking (MPPT) control that tracks the corresponding power and voltage when the solar power generation system generates maximum power. The MPPT operation can include an algorithm implemented to continuously adjust the impedance received by the solar module (110) or an array composed of multiple solar modules (110) so that the solar power generation system operates near the maximum power point when conditions such as irradiance, temperature, and load change. In the present embodiment, the processor (124) can control the operation of the MPPT control unit (125) using monitoring information.

[0065] Figure 6 is a flowchart illustrating the operation method of a solar power generation system according to one embodiment. In the following description, any portions that overlap with the descriptions of Figures 1 to 5 will be omitted. The operation method of the solar power generation system according to this embodiment will be described assuming that the MLPE device (120) performs the operation in the processor (124) with the assistance of peripheral components.

[0066] Referring to FIG. 6, in step S610, the processor (124) can monitor the status of the solar module (110) and control the output power of the solar module (110) to be optimized.

[0067] At step S620, the processor (124) can dynamically control the RSD function of the RSD module (122) in response to the initial driving time and the control signal of the power conversion unit (300) while being separated from the system (500).

[0068] In this embodiment, when the processor (124) dynamically controls the RSD function of the RSD module (122), the processor (124) can release the RSD function of the RSD module (122) for a first time as the initial operation of the MLPE device (120) is initiated.

[0069] In this embodiment, when the processor (124) dynamically controls the RSD function of the RSD module (122), the output power of the solar module (110) can be transmitted to the power conversion unit (300) for a first time, thereby operating the inverter (330) by boosting the converter (320) provided in the power conversion unit (300).

[0070] When dynamically controlling the RSD function of the RSD module (122), the processor (124) can control the RSD function of the RSD module (122) in response to an RSD operation control signal received from the power conversion unit (300) within a second time period after the initial operation of the MLPE device (120) is initiated. The processor (124) can maintain the RSD function disabled by receiving the RSD operation control signal from the power conversion unit (300) within the second time period. The processor (124) can activate the RSD function by not receiving the RSD operation control signal from the power conversion unit (300) within the second time period.

[0071] In this embodiment, the second time is shorter than the first time, and the sum of the first time and the second time may be within a preset time (e.g., 10 seconds).

[0072] As an optional embodiment, the MLPE device (120) can perform Maximum Power Point Tracking (MPPT) control to optimize the output power of the solar module (110).

[0073] Fig. 7 is a flowchart for explaining an operating method of a solar power generation system according to another embodiment, and Figs. 8 and 9 are exemplary diagrams for explaining the operating method of the solar power generation system of Fig. 7. In the following description, any part that overlaps with the description of Figs. 1 to 6 will be omitted. The operating method of the solar power generation system according to the present embodiment will be explained assuming that the MLPE device (120) performs the operation in the processor (124) with the help of peripheral components.

[0074] Referring to FIGS. 7 to 9, in step S710, the processor (124) may disable the RSD function of the RSD module (122) for a first time period after the initial operation of the MLPE device (120) is initiated. When the MLPE device (120) is initially operated when the sun rises in the morning, if the processor (124) disables the RSD function for the first time period, the output power of the MLPE device (120) may be charged by the link capacitor. When the charging voltage reaches the operating range, the link capacitor begins to discharge, and the inverter (330) may be operated by the boosting of the converter (320) with this discharge voltage.

[0075] In step S720, the processor (124) can determine whether an RSD release signal has been received from the power converter (300) within the second time period. Since the on / off time is different for each MLPE device (120), if the output of the MLPE device (120) is maintained for the sum of the first time period and the second time period during which the inverter (330) can operate by boosting the converter (320), an RSD operation control signal (a signal for releasing the RSD function) can be transmitted to the MLPE device (120) through the PLC communication unit (310).

[0076] In steps S730 and S740, the processor (124) may activate the RSD function (RSD ON) when it does not receive an RSD operation control signal from the power conversion unit (300) within the second time period. As the RSD function is activated (RSD ON), the output power of the MLPE device (120) cannot be transmitted to the power conversion unit (300).

[0077] Fig. 8 is an exemplary diagram explaining the state of a solar power generation system according to the activation of the RSD function (RSD ON). Referring to Fig. 8, when the amount of solar radiation is insufficient in a power outage or battery (200) over-discharge situation, the solar power generation system may be put into a shut down state. At this time, when the amount of solar radiation increases, such as at sunrise, and solar power is generated, since the MLPE device (120) is in a state where the RSD function is maintained (RSD ON), solar power may not be transmitted to the inverter (330) through the MLPE device (120). In this case, the PLC communication unit (310) of the power conversion unit (300) may not be able to transmit an RSD release signal to the MLPE device (120) (OFF), and a situation may occur in which solar power cannot be used until the ON-grid situation occurs.

[0078] In steps S750 and S760, the processor (124) may maintain the RSD function disabled (RSD OFF) upon receiving an RSD operation control signal from the power conversion unit (300) and transmit the output power of the MLPE device (120) to the power conversion unit (300). The converter (320) of the power conversion unit (300) may boost the output power to charge the battery (200) or input the converted AC power to the inverter (330) to supply the load (400) and the system (500).

[0079] FIG. 9 is an exemplary diagram illustrating the state of a solar power generation system according to the release of the RSD function (RSD OFF). Referring to FIG. 9, when the MLPE device (120) is initially driven when the sun rises in the morning, if the processor (124) releases the RSD function for a first time, the output power of the MLPE device (120) can be charged to the link capacitor. When the charging voltage reaches the operating range, the link capacitor starts operating, and the inverter (330) can be operated by boosting the converter (320) with this discharge voltage. When the output of the MLPE device (120) is maintained for the sum of the first and second times during which the inverter (330) can operate by boosting the converter (320), an RSD operation control signal (a signal for releasing the RSD function, ON) can be transmitted to the MLPE device (120) through the PLC communication unit (310) of the power conversion unit (300). In the present embodiment, when one of the converter (320) and the inverter (330) operates, the PLC communication unit (310) can start operation and transmit a signal to the MLPE device (120). The MLPE device (120) that receives the RSD function release signal (ON) from the PLC communication unit (310) releases the RSD (RSD OFF) to continue outputting solar power, and the inverter (330) can convert this power to respond to an OFF-grid situation or charge a battery (200).

[0080] The embodiments of the present invention described above may be implemented in the form of a computer program that can be executed through various components on a computer, and such a computer program may be recorded on a computer-readable medium. At this time, the medium may include a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, an optical recording medium such as a CD-ROM and a DVD, a magneto-optical medium such as a floptical disk, and a hardware device specifically configured to store and execute program instructions, such as a ROM, a RAM, a flash memory, etc.

[0081] Meanwhile, the computer program may be specifically designed and constructed for the present invention, or may be one known and available to those skilled in the computer software field. Examples of computer programs may include not only machine language code, such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

[0082] The use of the term "above" and similar referential terms in the specification of the present invention (especially in the claims) may refer to both singular and plural. Furthermore, when a range is described in the present invention, it is intended that the invention encompasses inventions that apply individual values ​​falling within the range (unless otherwise stated), and is equivalent to describing each individual value constituting the range in the detailed description of the invention.

[0083] Unless the steps constituting the method according to the present invention are explicitly described in a specific order or are not described to the contrary, the steps may be performed in any appropriate order. The present invention is not necessarily limited to the order in which the steps are described. The use of all examples or exemplary terms (e.g., "for example," etc.) in the present invention is merely intended to illustrate the present invention in detail, and the scope of the present invention is not limited by the examples or exemplary terms unless otherwise defined by the claims. Furthermore, those skilled in the art will appreciate that various modifications, combinations, and variations can be configured according to design conditions and factors within the scope of the appended claims or their equivalents.

[0084] Therefore, the idea of ​​the present invention should not be limited to the embodiments described above, and all scopes equivalent to or equivalently modified from the following claims as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. Solar modules; and Includes a module level power electronics (MLPE) device connected to the solar module to optimize the output power of the solar module, The above MLPE device, An RSD module that rapidly shuts down the output power of the solar module from being output to a power conversion unit that converts the optimized power from the MLPE device into power that can be supplied to a load and a grid, or converts the power supplied from the grid into power that can be stored in a battery; and A processor that monitors the status of the solar module to control the output power of the solar module to be optimized, and dynamically controls the RSD function of the RSD module in response to the initial operation time of the MLPE device and the control signal of the power conversion unit. Solar power generation system.

2. In paragraph 1, The above processor, As the initial operation of the MLPE device is initiated, the RSD function of the RSD module is disabled for a first time period. Solar power generation system.

3. In paragraph 2, The above processor, During the first time, the output power of the solar module is transmitted to the power conversion unit, and the inverter is operated by boosting the converter provided in the power conversion unit. Solar power generation system.

4. In paragraph 2, The above processor, Controlling the RSD function of the RSD module in response to an RSD operation control signal received from the power conversion unit within a second time after the initial operation of the MLPE device is initiated. Solar power generation system.

5. In paragraph 4, The above processor, Maintaining the release of the RSD function upon receiving the RSD operation control signal from the power converter within the second time period; Activating the RSD function when the RSD operation control signal is not received from the power conversion unit within the second time period. Solar power generation system.

6. In paragraph 4, The second time is shorter than the first time, The sum of the first time and the second time is within the preset time, Solar power generation system.

7. In paragraph 1, The above MLPE device, Further comprising an MPPT control unit that performs maximum power point tracking (MPPT) control to optimize the output power of the solar module. Solar power generation system.

8. A method of operating a solar power generation system including a solar module and an MLPE (module level power electronics) device connected to the solar module to optimize the output power of the solar module, A step of the MLPE device monitoring the status of the solar module and controlling the output power of the solar module to be optimized; and The MLPE device comprises a step of dynamically controlling the RSD function of the RSD module to rapidly shut down the output power of the solar module from being output to the power conversion unit in response to the initial operation time and the control signal of the power conversion unit that converts the optimized power from the MLPE device into power that can be supplied to the load and the system, or converts the power supplied from the system into power that can be stored in the battery. How a solar power generation system works.

9. In paragraph 8, The step of dynamically controlling the RSD function of the above RSD module is: Comprising the step of disabling the RSD function of the RSD module for a first time as the initial operation of the MLPE device is initiated, How a solar power generation system works.

10. In paragraph 9, The step of dynamically controlling the RSD function of the above RSD module is: A step of transmitting the output power of the solar module to the power conversion unit during the first time period, thereby operating the inverter by boosting the converter provided in the power conversion unit. How a solar power generation system works.

11. In paragraph 9, The step of dynamically controlling the RSD function of the above RSD module is: A step of controlling the RSD function of the RSD module in response to an RSD operation control signal received from the power conversion unit within a second time after the initial operation of the MLPE device is initiated, How a solar power generation system works.

12. In paragraph 11, The step of dynamically controlling the RSD function of the above RSD module is: A step of maintaining the release of the RSD function upon receiving the RSD operation control signal from the power conversion unit within the second time; and Including a step of activating the RSD function upon not receiving the RSD operation control signal from the power conversion unit within the second time period. How a solar power generation system works.

13. In paragraph 11, The second time is shorter than the first time, The sum of the first time and the second time is within the preset time, How a solar power generation system works.

14. In paragraph 8, The MLPE device further comprises a step of performing Maximum Power Point Tracking (MPPT) control to optimize the output power of the solar module. How a solar power generation system works.

15. A computer-readable recording medium storing a computer program for executing any one of the methods of clauses 8 to 14 using a computer.

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