Photovoltaic string and photovoltaic system
The photovoltaic string design using series connection and magnetic ring control solves the problem of high voltage danger in photovoltaic strings under emergency conditions, improves stability and cost-effectiveness, and ensures safe rapid power outage.
Patent Information
- Application Number
- CN202423106498.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing photovoltaic strings cannot be quickly disconnected in case of emergencies such as fires, leading to high voltage hazards. Furthermore, the parallel-connected shutdown components cannot function properly on cloudy or rainy days or in low light conditions, increasing costs and complexity.
The circuit adopts a series connection method, sends an AC signal through a magnetic ring to control the switching module, and uses a carrier extraction module to extract electrical signals from the inter-board connection line to supply power, thereby achieving stable operation of the shutdown component. The DC circuit can be remotely disconnected through the host computer.
It reduces production costs, improves system stability and installation efficiency, and ensures that the voltage can be quickly reduced to a safe range in case of emergencies, thus avoiding disruption to normal power generation.
Smart Images
Figure CN223567579U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic safety technical field especially relates to a photovoltaic group string and photovoltaic system. BACKGROUND
[0002] Safety is very important in photovoltaic system, photovoltaic group string is connected to the later stage inverter and other power generation equipment by photovoltaic component through photovoltaic terminal and DC cable series connection, usually single photovoltaic component voltage is 10~80V, whole photovoltaic group string voltage is 1000V~1500V, belongs to high voltage direct current, if special condition such as fire occurs, photovoltaic group string does not disconnect one by one, high voltage still exists, it is very dangerous to fireman, often misses the first time of fire fighting.
[0003] In order to quickly disconnect photovoltaic group string, it is necessary to be equipped with shutdown component in photovoltaic power generation system, and the photovoltaic group string is disconnected by controlling the shutdown component to disconnect, so that the voltage of the whole photovoltaic group string is reduced to the human body safety voltage range, at present, the connection mode of the shutdown component and the photovoltaic component mainly adopts parallel mode, however, since the shutdown component connected with the photovoltaic component in parallel mode is powered by the photovoltaic component, the shutdown component cannot work normally in rainy days or weak light, and the power consumption of the shutdown component itself also affects the power generation capacity of the whole photovoltaic system, and a shutdown component needs to be installed under each photovoltaic component, which further increases the cost and the complexity of installation and maintenance. SUMMARY
[0004] The utility model discloses a photovoltaic group string and photovoltaic system, can reduce production cost and do not consume the power generation capacity of photovoltaic system, and improve the stability of operation.
[0005] In the first aspect, the utility model discloses a photovoltaic group string, is applied to photovoltaic system, the photovoltaic system includes inverter and transmitter, the input of inverter is connected with photovoltaic group string, and the output is connected with power grid, the photovoltaic group string includes: a plurality of photovoltaic components, two adjacent photovoltaic components are connected in series through the inter -plate connecting wire, the first magnetic ring is set on the connecting wire of the first end photovoltaic component or the last end photovoltaic component in the photovoltaic group string and the inverter, the transmitter is electrically connected with the first magnetic ring, and the transmitter is used to send the alternating current signal of the preset frequency to the photovoltaic group string through the first magnetic ring, a plurality of shutdown components are arranged in the inter -plate connecting wire, and the shutdown component includes carrier wave extraction module and switch control module for controlling the on-off of the direct current loop of the inter -plate connecting wire, and the carrier wave extraction module is used to extract the alternating current signal from the inter -plate connecting wire and power supply for the switch control module.
[0006] The photovoltaic string has at least the following beneficial effects: the input end of the inverter is connected with the photovoltaic string, the output end is connected with the power grid, two adjacent photovoltaic modules in the photovoltaic string are connected in series through an inter-board connecting line, a shutdown module is arranged on the inter-board connecting line, a first magnetic ring is arranged on the connecting line between the first end photovoltaic module or the last end photovoltaic module in the photovoltaic string and the inverter, the emitter is electrically connected with the first magnetic ring, the emitter is used for sending an alternating current signal of a preset frequency to the photovoltaic string through the first magnetic ring, a carrier extraction module in each shutdown module extracts the alternating current signal from the inter-board connecting line, each carrier extraction module supplies power to the switch control module, the switch control module controls the direct current loop of the inter-board connecting line to be conducted, so that the entire photovoltaic string has electricity, and the rear-end power generation equipment starts to work normally; since the switch control module can control the on-off of the direct current loop of the inter-board connecting line, when an emergency occurs, the switch control modules of all the shutdown modules control the direct current loop of the inter-board connecting line to be disconnected, and the voltage of the entire photovoltaic string can be quickly reduced to a safe voltage range acceptable by human bodies, so that timely measures can be taken to handle the emergency; compared with a scheme in which the photovoltaic module and the shutdown module are connected in parallel, on the one hand, each shutdown module is connected with the photovoltaic module in series, only two cables need to be arranged, the overall cost is saved, the complexity of installation and maintenance is reduced, the installation efficiency is improved, and on the other hand, the shutdown module extracts the alternating current signal from the inter-board connecting line through the carrier extraction module to realize power supply, and does not need to obtain energy from the photovoltaic module, so that the power generation capacity of the photovoltaic system is not consumed, and the situation that the shutdown module cannot work normally due to unstable power generation of part of the photovoltaic modules is avoided, the stability of the photovoltaic system is improved, and compared with the scheme in which each photovoltaic module is installed below one shutdown module and one shutdown module is connected between two adjacent photovoltaic modules, the use of the shutdown module is reduced, and the cost is further saved.
[0007] According to some embodiments of the utility model, a photovoltaic string is provided, the switch control module comprises a power supply module, a control module and a switch module, the carrier extraction module is connected with the input end of the power supply module, the output end of the power supply module is connected with the input end of the control module, the output end of the control module is connected with the switch module, and the switch module is connected with the inter-board connecting line to form the direct current loop.
[0008] The utility model provides a photovoltaic array according to some embodiments of the utility model, the switch module includes drive module and first MOS pipe, the output of control module is connected with the input of drive module, the output of drive module is connected with the first input of first MOS pipe, the inter -plate connecting wire is connected with the first output of first MOS pipe and the second output of first MOS pipe and constitutes the direct current loop.
[0009] The utility model provides a photovoltaic array according to some embodiments of the utility model, the carrier wave extraction module includes second magnetic ring, first filter module, the second magnetic ring is sleeved in the inter -plate connecting wire, the second magnetic ring is connected with the input of first filter module, and the output of first filter module is connected with the switch control module.
[0010] The utility model provides a photovoltaic array according to some embodiments of the utility model, the carrier wave extraction module includes first inductance, second filter module, and the first inductance is connected with the inter -plate connecting wire, and the first inductance is connected with the input of second filter module, and the output of second filter module is connected with the switch control module.
[0011] The utility model provides a photovoltaic array according to some embodiments of the utility model, when the transmitter is powered off or the transmitter stops sending the preset frequency AC signal, the direct current loop of the inter -plate connecting wire is disconnected.
[0012] The utility model provides a photovoltaic array according to some embodiments of the utility model, when the output of control module is high level, the direct current loop that the switch module is connected with the inter -plate connecting wire constitutes and is conducted.
[0013] The utility model provides a photovoltaic array according to some embodiments of the utility model, when the output of drive module is high level, the direct current loop that the inter -plate connecting wire is connected with the first output of first MOS pipe and the second output of first MOS pipe constitutes and is conducted.
[0014] Secondly, the utility model provides a photovoltaic system, the photovoltaic system includes inverter, transmitter and the photovoltaic array of any one of the first aspect embodiment, and the output of inverter is connected with the power grid.
[0015] The utility model provides a photovoltaic system according to some embodiments of the utility model, still include host computer, first communication module, and the first communication module is connected with the transmitter, and the first communication module is connected with host computer communication.
[0016] The utility model provides a photovoltaic system according to some embodiments of the utility model, when the first control instruction is sent to the transmitter by the first communication module of host computer, the transmitter is powered off.
[0017] According to the photovoltaic system provided by some embodiments of the present application, when the upper computer sends a second control instruction to the transmitter through the first communication module, the transmitter stops sending the preset frequency AC signal. BRIEF DESCRIPTION OF DRAWINGS
[0018] The drawings are used to provide a further understanding of the technical scheme of the present application, and form a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.
[0019] The present application will be further described below in combination with the drawings and embodiments;
[0020] Figure 1 is a structural diagram of a photovoltaic system provided by an embodiment of the present application;
[0021] Figure 2 is a structural diagram of a photovoltaic module and a shutdown device connected in parallel provided by an embodiment of the present application;
[0022] Figure 3 is a structural diagram of another photovoltaic system provided by an embodiment of the present application;
[0023] Figure 4 is a structural diagram of a first form of shutdown device in a photovoltaic string provided by an embodiment of the present application;
[0024] Figure 5 is a structural diagram of a second form of shutdown device in a photovoltaic string provided by an embodiment of the present application;
[0025] Figure 6 is a structural diagram of a third form of shutdown device in a photovoltaic string provided by an embodiment of the present application;
[0026] Figure 7 is a structural diagram of a fourth form of shutdown device in a photovoltaic string provided by an embodiment of the present application;
[0027] Figure 8 is a structural diagram of a fifth form of shutdown device in a photovoltaic string provided by an embodiment of the present application. DETAILED DESCRIPTION
[0028] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the drawings, and the role of the drawings is to supplement the description of the text part of the specification with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.
[0029] In the description of the utility model, if it is described to first, second only for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0030] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.
[0031] Safety is very important in photovoltaic system, photovoltaic module is connected in series with direct current cable through photovoltaic terminal and connected to the later stage inverter and other power generation equipment, usually the voltage of single photovoltaic module is 10-80V, the voltage of whole photovoltaic string is 1000V-1500V, which belongs to high voltage direct current, if fire and other special conditions occur, photovoltaic string cannot be disconnected one by one, high voltage still exists, which is very dangerous to firefighters, and the first time of fire fighting is often missed.
[0032] In order to quickly disconnect photovoltaic string, it is necessary to equip with shutdown module RSD in photovoltaic power generation system, the photovoltaic string is disconnected by controlling the shutdown module to disconnect, and then the voltage of whole photovoltaic string is reduced to the range of human body safe voltage, at present, the connection mode of shutdown module and photovoltaic module mainly adopts parallel mode, referring to Figure 1 、 Figure 2 Specifically, a power supply module, a control module, a MOS tube and a communication module are arranged in the shutdown module, the power supply module obtains power supply from the photovoltaic module, the control module is connected with the power supply module, the communication module and the MOS tube, the on-off of adjacent photovoltaic modules is controlled through the MOS tube, so that the photovoltaic string can be quickly disconnected in the event of an emergency, however, since the shutdown module connected with photovoltaic panel in parallel mode is provided with power supply by the photovoltaic module, on the one hand, the shutdown module needs to be provided with four direct current cables, two of which are connected with the positive and negative terminals of the photovoltaic module respectively, and the other two are used to connect two adjacent shutdown modules, which increases the cost of the whole machine; on the other hand, affected by the energy supply of the photovoltaic module, the power supply of the photovoltaic module is insufficient in rainy days or weak light, so that the shutdown module cannot work normally in rainy days or weak light, and the power consumption of the shutdown module itself also affects the power generation of the whole photovoltaic system; in addition, a shutdown module needs to be installed below each photovoltaic panel, which further increases the cost and increases the complexity of installation and maintenance.
[0033] Based on this, the utility model embodiment provides a kind of photovoltaic string and photovoltaic system, which can reduce production cost and not consume the power generation of photovoltaic system, and improve the stability of photovoltaic system operation.
[0034] The embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0035] Reference Figure 3 , Figure 4 The first aspect of this utility model provides a photovoltaic string for use in a photovoltaic system. The photovoltaic system includes an inverter and a transmitter 300. The input end of the inverter is connected to the photovoltaic string, and the output end is connected to the power grid. The photovoltaic string includes: multiple photovoltaic modules 100, with adjacent photovoltaic modules 100 connected in series via inter-panel connection lines 101; a first magnetic ring 310, sleeved on the connection line between the first photovoltaic module 110 or the last photovoltaic module 120 in the photovoltaic string and the inverter; the transmitter 300 is electrically connected to the first magnetic ring 310, and the transmitter 300 is used to send an AC signal of a preset frequency to the photovoltaic string through the first magnetic ring 310; and multiple shutdown components 200, respectively disposed on the inter-panel connection lines 101. Each shutdown component 200 includes a carrier extraction module 210 and a switch control module 220 for controlling the on / off state of the DC circuit of the inter-panel connection lines 101. The carrier extraction module 210 is used to extract AC signals from the inter-panel connection lines 101 and supply power to the switch control module 220.
[0036] According to the photovoltaic string provided by the embodiment of the utility model, the input end of the inverter is connected with the photovoltaic string, the output end is connected with the power grid, the adjacent two photovoltaic components 100 in the photovoltaic string are connected in series through the interboard connecting line 101, the shutdown component 200 is arranged on the interboard connecting line 101, the first magnetic ring 310 is sleeved on the connecting line between the first end photovoltaic component 110 or the last end photovoltaic component 120 in the photovoltaic string and the inverter, the emitter 300 is electrically connected with the first magnetic ring 310, the emitter 300 is used for sending the alternating current signal of preset frequency to the photovoltaic string through the first magnetic ring 310, the carrier extraction module 210 in each shutdown component 200 extracts the alternating current signal from the interboard connecting line 101, each carrier extraction module 210 supplies power to the switch control module 220, the switch control module 220 controls the direct current loop of the interboard connecting line 101 to be conducted, so that the whole photovoltaic string has electricity, and the rear end power generation equipment starts to work normally; Because the switch control module 220 can control the on-off of the direct current loop of the interboard connecting line 101, when the emergency situation is encountered, the switch control module 220 of all shutdown components 200 controls the direct current loop of the interboard connecting line 101 to be disconnected, the voltage of the whole photovoltaic string can be quickly reduced to the safe voltage range acceptable by human body, and the timely measures for handling the emergency event are not affected; Compared with the scheme that the photovoltaic component 100 and the shutdown component 200 are connected in parallel, on the one hand, each shutdown component 200 is connected with the photovoltaic component 100 in series, only two cables need to be arranged, the whole machine cost is saved, and the installation and maintenance complexity is reduced, which is beneficial to improve the installation efficiency, on the other hand, the shutdown component 200 extracts the alternating current signal from the interboard connecting line 101 through the carrier extraction module 210 to realize power supply, and does not need to obtain energy from the photovoltaic component 100, and will not consume the power generation capacity of the photovoltaic system, at the same time, the situation that the shutdown component 200 cannot work normally due to unstable power generation of part of the photovoltaic components 100 is avoided, the stability of the photovoltaic system operation is improved, and compared with the scheme that each photovoltaic component 100 is installed below one shutdown component 200 and the shutdown component 200 is connected between the adjacent two photovoltaic components 100, the use of the shutdown component 200 is reduced, and the cost is further saved.
[0037] It should be noted that the emitter 300 can be powered by the power generation equipment on the inverter side or by the power module itself.
[0038] It should be noted that the emitter 300 is used for sending the alternating current signal of preset frequency to the photovoltaic string through the first magnetic ring 310, that is, the emitter 300 is used for sending the carrier signal of preset frequency to the photovoltaic string through the first magnetic ring 310.
[0039] It should be noted that the inter-board connecting line 101 is connected with part of the devices in the switch control module 220 to constitute a direct current loop of the inter-board connecting line 101, and the on-off of the direct current loop can be further controlled by controlling the on-off of the part of the devices in the switch control module 220 connected with the inter-board connecting line 101, and the carrier extraction module 210 is connected with the switch control module 220 and supplies power to the switch control module 220.
[0040] It should be noted that the inter-board connecting line 101 is connected with part of the devices in the switch control module 220 to constitute a direct current loop of the inter-board connecting line 101, and the on-off of the direct current loop can be further controlled by controlling the on-off of the part of the devices in the switch control module 220 connected with the inter-board connecting line 101, and the carrier extraction module 210 is connected with the switch control module 220 and supplies power to the switch control module 220.
[0041] According to some embodiments of the utility model, when the emitter 300 is powered off or the emitter 300 stops sending the preset frequency alternating current signal, the direct current loop of the inter-board connecting line 101 is disconnected.
[0042] It can be understood that when the emitter 300 is powered off, the emitter 300 cannot send the preset frequency alternating current signal to the photovoltaic string through the first magnetic ring 310.
[0043] It should be noted that when the emitter 300 is powered off or the emitter 300 stops sending the preset frequency alternating current signal, the carrier extraction module 210 cannot extract the alternating current signal from the inter-board connecting line 101, and the carrier extraction module 210 cannot supply power to the switch control module 220, thereby making the switch control module 220 unable to control the direct current loop of the inter-board connecting line 101 to be turned on.
[0044] According to some embodiments of the utility model, a photovoltaic string is provided. Figure 5 The switch control module 220 includes a power supply module 221, a control module 222 and a switch module 223, the carrier extraction module 210 is connected with the input end of the power supply module 221, the output end of the power supply module 221 is connected with the input end of the control module 222, the output end of the control module 222 is connected with the switch module 223, and the switch module 223 is connected with the inter-board connecting line 101 to constitute a direct current loop.
[0045] It should be noted that the carrier extraction module 210 is used for extracting the alternating current signal from the inter-board connecting line 101 and supplying power to the power supply module 221, the power supply module 221 is connected with the control module 222, the power supply module 221 is used for providing stable voltage meeting the needs of the control module 222, ensuring that the control module 222 can obtain the required power, thereby keeping the stable operation of the shut-off assembly 200.
[0046] According to some embodiments of the utility model, when the output end of the control module 222 outputs a high level, the switch module 223 and the inter-board connecting line 101 are connected to form a direct current loop conduction.
[0047] It should be noted that the control module 222 is used for controlling the on-off of the switch module 223, when the switch module 223 is on, the switch module 223 and the inter-board connecting line 101 are connected to form a direct current loop conduction, when the switch module 223 is off, the switch module 223 and the inter-board connecting line 101 are connected to form a direct current loop disconnection; when the output end of the control module 222 outputs a high level, the switch module 223 is on, therefore, the switch module 223 and the inter-board connecting line 101 are connected to form a direct current loop conduction; when the emitter 300 is powered off or the emitter 300 stops sending the preset frequency of alternating current signal, the carrier extraction module 210 cannot extract the alternating current signal from the inter-board connecting line 101, the carrier extraction module 210 cannot power the power supply module 221, the control module 222 connected with the power supply module 221 stops working, the output end of the control module 222 cannot output a high level, the switch module 223 is off, the switch module 223 and the inter-board connecting line 101 are connected to form a direct current loop disconnection, so that the photovoltaic string is disconnected, and the voltage of the whole photovoltaic string can be quickly reduced to the safe voltage range acceptable by human body, without affecting the timely measures to deal with the emergency.
[0048] According to some embodiments of the utility model, a photovoltaic string is provided, referring to Figure 6 The switch module 223 comprises a driving module 10 and a first MOS tube Q1, the output end of the control module 222 is connected with the input end of the driving module 10, the output end of the driving module 10 is connected with the first input end of the first MOS tube Q1, and the inter-board connecting line 101 is connected with the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 to form a direct current loop.
[0049] Optionally, the first MOS tube Q1 can be an NMOS tube, the output end of the driving module 10 is connected with the first input end of the first MOS tube Q1, i.e. the gate of the NMOS tube, and the inter-board connecting line 101 is connected with the first output end of the first MOS tube Q1, i.e. the source of the NMOS tube, and the second output end of the first MOS tube Q1, i.e. the drain of the NMOS tube, to form a direct current loop.
[0050] It should be noted that the carrier extraction module 210 is used to extract the alternating current signal from the inter-board connection line 101 and supply power to the power supply module 221, and the power supply module 221 is connected with the control module 222, and the power supply module 221 is used to provide a stable voltage meeting the needs of the control module 222, so as to ensure that the control module 222 can obtain the required power, and the control module 222 is connected with the driving module 10, and the driving module 10 is used to control the conduction and cutoff of the first MOS tube Q1; when the first MOS tube Q1 is conducted, the inter-board connection line 101 and the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 are connected to constitute a direct current loop conduction; when the first MOS tube Q1 is cut off, the inter-board connection line 101 and the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 are connected to constitute a direct current loop disconnection.
[0051] It can be understood that the driving module 10 is arranged between the control module 222 and the first MOS tube Q1, on the one hand, the driving module 10 can effectively improve the driving current of the MOS tube, so as to ensure that the MOS tube can be quickly and reliably turned off, and the MOS tube is protected; on the other hand, the driving module 10 has overcurrent and overvoltage protection functions, and can protect the MOS tube from being damaged in abnormal conditions.
[0052] According to the photovoltaic string provided by some embodiments of the utility model, when the output end of the driving module 10 outputs a high level, the direct current loop formed by the inter-board connection line 101 and the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 is conducted.
[0053] It should be noted that when the output end of the driving module 10 outputs a high level, the first MOS tube Q1 is conducted, and the direct current loop formed by the inter-board connection line 101 and the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 is conducted; when the emitter 300 is powered off or the emitter 300 stops sending the alternating current signal of the preset frequency, the carrier extraction module 210 cannot extract the alternating current signal from the inter-board connection line 101, and the carrier extraction module 210 cannot power the power supply module 221, the control module 222 connected with the power supply module 221 stops working, the output end of the control module 222 cannot output a high level, the driving module 10 connected with the control module 222 stops working, the first MOS tube Q1 is cut off, and the direct current loop formed by the inter-board connection line 101 and the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 is disconnected, so that the photovoltaic string is disconnected, and the voltage of the entire photovoltaic string can be quickly reduced to a safe voltage range acceptable by the human body, without affecting the timely measures to deal with the emergency.
[0054] According to the photovoltaic string provided by some embodiments of the utility model, referring to Figure 7The carrier extraction module 210 comprises a second magnetic ring 211, a first filter module 212, the second magnetic ring 211 is sleeved on the inter-board connecting line 101, the second magnetic ring 211 is connected with the input end of the first filter module 212, and the output end of the first filter module 212 is connected with the switch control module 220.
[0055] It should be noted that the second magnetic ring 211 is sleeved on the inter-board connecting line 101, the second magnetic ring 211 in the carrier extraction module 210 is used for extracting an alternating current signal of a preset frequency from the inter-board connecting line 101, the second magnetic ring 211 is connected with the input end of the first filter module 212, the output end of the first filter module 212 is connected with the switch control module 220, the first filter module 212 is used for filtering the alternating current signal extracted by the second magnetic ring 211, and high-frequency noise and interference in the signal suppressed by the second magnetic ring 211 are filtered out, energy is decoupled out through the filtering of the first filter module 212, and the switch control module 220 is powered.
[0056] According to some embodiments of the utility model, a photovoltaic module string is provided, the carrier extraction module 210 comprises a second magnetic ring 211, a first filter module 212, the second magnetic ring 211 is sleeved on the inter-board connecting line 101, the second magnetic ring 211 is connected with the input end of the first filter module 212, the output end of the first filter module 212 is connected with the input end of the power supply module 221, the output end of the power supply module 221 is connected with the input end of the control module 222, the output end of the control module 222 is connected with the switch module 223, and the switch module 223 is connected with the inter-board connecting line 101 and constitutes a direct current loop.
[0057] According to some embodiments of the utility model, a photovoltaic module string is provided, referring to Figure 7 , the carrier extraction module 210 comprises a second magnetic ring 211, a first filter module 212, the second magnetic ring 211 is sleeved on the inter-board connecting line 101, the second magnetic ring 211 is connected with the input end of the first filter module 212, the output end of the first filter module 212 is connected with the input end of the power supply module 221, the output end of the power supply module 221 is connected with the input end of the control module 222, the output end of the control module 222 is connected with the input end of the drive module 10, the output end of the drive module 10 is connected with the first input end of the first MOS tube Q1, and the inter-board connecting line 101 is connected with the first output end of the first MOS tube Q1 and the second output end of the first MOS tube Q1 and constitutes a direct current loop.
[0058] According to some embodiments of the utility model, a photovoltaic module string is provided, referring to Figure 8The carrier extraction module 210 includes a first inductor L1 and a second filter module 213. The first inductor L1 is connected to the inter-board connection line 101 and the input terminal of the second filter module 213 is connected to the output terminal of the second filter module 213.
[0059] The first inductor L1 in the carrier extraction module 210 is connected to the inter-board connection line 101. The first inductor L1 is used to extract an AC signal of a preset frequency from the inter-board connection line 101. The first inductor L1 is connected to the input terminal of the second filtering module 213. The output terminal of the second filtering module 213 is connected to the switch control module 220. The second filtering module 213 is used to filter the AC signal extracted by the first inductor L1. Through the filtering process of the second filtering module 213, energy is decoupled and supplied to the switch control module 220.
[0060] According to some embodiments of the present invention, a photovoltaic string includes a carrier extraction module 210 comprising a first inductor L1 and a second filter module 213. The first inductor L1 is connected to the inter-board connection line 101 and the input terminal of the second filter module 213 is connected to the input terminal of the power supply module 221. The output terminal of the power supply module 221 is connected to the input terminal of the control module 222 and the output terminal of the control module 222 is connected to the switch module 223. The switch module 223 is connected to the inter-board connection line 101 to form a DC circuit.
[0061] A photovoltaic string according to some embodiments of the present invention, with reference to... Figure 8 The carrier extraction module 210 includes a first inductor L1 and a second filter module 213. The first inductor L1 is connected to the inter-board connection line 101 and the input terminal of the second filter module 213. The output terminal of the second filter module 213 is connected to the input terminal of the power supply module 221. The output terminal of the power supply module 221 is connected to the input terminal of the control module 222. The output terminal of the control module 222 is connected to the input terminal of the drive module 10. The output terminal of the drive module 10 is connected to the first input terminal of the first MOSFET Q1. The inter-board connection line 101 is connected to the first output terminal and the second output terminal of the first MOSFET Q1 to form a DC circuit.
[0062] According to some embodiments of the present invention, a photovoltaic string is provided, and the shutdown component 200 further includes a data acquisition module and a second communication module. The data acquisition module is connected to the switch control module 220 and is used to acquire current data of the photovoltaic module 100. The second communication module is connected to the switch control module 220 and is used to send current data to the transmitter 300.
[0063] It can be understood that the transmitter 300 receives the current data sent by the second communication module, for example, when the photovoltaic module 100 is connected in poor condition, the processing module built-in the transmitter 300 will detect that the current data is lower than the preset parameter, generate a prompt information, so that the maintenance personnel can quickly go to the location of a photovoltaic module 100 to repair.
[0064] In the second aspect, the utility model embodiment provides a photovoltaic system, photovoltaic system includes inverter, transmitter 300 and like any one of photovoltaic module string in the first aspect embodiment, the output of inverter is connected with power grid.
[0065] According to some embodiments of the utility model provide a kind of photovoltaic system, refer to Figure 3 Further comprising host computer, first communication module 400, first communication module 400 is connected with transmitter 300, first communication module 400 is connected with host computer.
[0066] It needs to be explained that host computer sends control instruction to transmitter 300 by first communication module 400, realizes remote control transmitter 300 work, when emergent situation appears, such as special situation such as fire, user can realize remote control transmitter 300 by host computer and stop sending the alternating current signal of preset frequency to photovoltaic module string by first magnetic ring 310, so that the switch control module 220 control panel of shutdown module 200 in photovoltaic module string controls that direct current loop of interconnection line 101 is disconnected, the voltage of entire photovoltaic module string can quickly reduce to the safe voltage range that human body can accept, does not affect timely measures to handle emergent event.
[0067] According to some embodiments of the utility model provide a kind of photovoltaic system, when host computer sends first control instruction to transmitter 300 by first communication module 400, transmitter 300 is powered off.
[0068] It can be understood that when host computer sends first control instruction to transmitter 300 by first communication module 400, transmitter 300 is powered off, when transmitter 300 is powered off, transmitter 300 cannot send the alternating current signal of preset frequency to photovoltaic module string by first magnetic ring 310.
[0069] According to some embodiments of the utility model provide a kind of photovoltaic system, when host computer sends second control instruction to transmitter 300 by first communication module 400, transmitter 300 stops sending the alternating current signal of preset frequency.
[0070] It should be noted that when the host computer sends the first control instruction to the transmitter 300 through the first communication module 400, the transmitter 300 is powered off, or the host computer sends the second control instruction to the transmitter 300 through the first communication module 400, the transmitter 300 stops sending the preset frequency of the alternating current signal, the carrier extraction module 210 of the shutdown assembly 200 cannot extract the alternating current signal from the inter-board connection line 101, the carrier extraction module 210 cannot power the switch control module 220, and the switch control module 220 cannot control the direct current loop of the inter-board connection line 101 to be turned on, so that the switch control module 220 of the shutdown assembly 200 in the photovoltaic module string controls the direct current loop of the inter-board connection line 101 to be turned off, and the voltage of the entire photovoltaic module string can be quickly reduced to a safe voltage range acceptable to the human body, without affecting the timely measures to handle the emergency.
[0071] According to some embodiments of the photovoltaic system provided by the utility model, the shutdown assembly 200 in the photovoltaic module string further comprises a collection module and a second communication module, the collection module is connected with the switch control module 220, the collection module is used for collecting current data of the photovoltaic module 100, the second communication module is connected with the switch control module 220, the second communication module is used for sending the current data to the transmitter 300, the first communication module 400 is connected with the transmitter 300, and the first communication module 400 is in communication connection with the host computer.
[0072] It can be understood that the transmitter 300 receives the current data sent by the second communication module, for example, when the photovoltaic module 100 is connected in a poor way, the processing module built-in the transmitter 300 will detect that the current data is lower than the preset parameter, generate a prompt information and send it to the host computer through the first communication module 400, so that the maintenance personnel can quickly go to the place where the photovoltaic module 100 is located to repair.
[0073] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the utility model.
Claims
1. A photovoltaic string, used in a photovoltaic system, characterized in that, The photovoltaic system comprises an inverter and a transmitter; an input end of the inverter is connected with the photovoltaic string, and an output end of the inverter is connected with a power grid; the photovoltaic string comprises: a plurality of photovoltaic components, two adjacent photovoltaic components are connected in series through an inter-board connecting line; a first magnetic ring, which is sleeved on a connecting line between a first-end photovoltaic component or a last-end photovoltaic component in the photovoltaic string and the inverter, the transmitter is electrically connected with the first magnetic ring, and the transmitter is used for transmitting an alternating-current signal of a preset frequency to the photovoltaic string through the first magnetic ring; a plurality of shut-off components, which are respectively arranged on the inter-board connecting lines, the shut-off component comprises a carrier extraction module and a switch control module used for controlling on-off of a direct-current loop of the inter-board connecting line, and the carrier extraction module is used for extracting the alternating-current signal from the inter-board connecting line and supplying power to the switch control module.
2. The photovoltaic string of claim 1, wherein, The switch control module comprises a power supply module, a control module and a switch module, the carrier extraction module is connected with an input end of the power supply module, an output end of the power supply module is connected with an input end of the control module, an output end of the control module is connected with the switch module, and the switch module is connected with the inter-board connecting line to form the direct-current loop.
3. The photovoltaic string of claim 2, wherein, The switch module comprises a driving module and a first MOS tube, an output end of the control module is connected with an input end of the driving module, an output end of the driving module is connected with a first input end of the first MOS tube, and the inter-board connecting line is connected with a first output end of the first MOS tube and a second output end of the first MOS tube to form the direct-current loop.
4. The photovoltaic string of claim 1, wherein, The carrier extraction module comprises a second magnetic ring and a first filter module, the second magnetic ring is sleeved on the inter-board connecting line, the second magnetic ring is connected with an input end of the first filter module, and an output end of the first filter module is connected with the switch control module.
5. The photovoltaic string of claim 1, wherein, The carrier extraction module comprises a first inductor and a second filter module, the first inductor is connected with the inter-board connecting line, the first inductor is connected with an input end of the second filter module, and an output end of the second filter module is connected with the switch control module.
6. The photovoltaic string of claim 1, wherein, When the transmitter is powered off or the transmitter stops transmitting the alternating-current signal of the preset frequency, the direct-current loop of the inter-board connecting line is disconnected.
7. The photovoltaic string of claim 2, wherein, When an output end of the control module outputs a high level, the direct-current loop formed by the switch module and the inter-board connecting line is turned on.
8. The photovoltaic string of claim 3, wherein, When an output end of the driving module outputs a high level, the direct-current loop formed by the inter-board connecting line, the first output end of the first MOS tube and the second output end of the first MOS tube is turned on.
9. A photovoltaic system characterized by, The photovoltaic system comprises an inverter, a transmitter and the photovoltaic string according to any one of claims 1 to 8, and an output end of the inverter is connected with a power grid.
10. The photovoltaic system of claim 9, wherein, Further comprising a host computer and a first communication module, the first communication module is connected with the transmitter, and the first communication module is in communication connection with the host computer.
11. The photovoltaic system of claim 10, wherein, When the host computer sends a first control instruction to the transmitter through the first communication module, the transmitter is powered off.
12. The photovoltaic system of claim 10, wherein, When the host computer sends a second control instruction to the transmitter through the first communication module, the transmitter stops sending the preset frequency of alternating current signals.