Photovoltaic system

Abstract

The utility model provides a photovoltaic system, and relates to the field of photovoltaic technology, the system comprises a digital / analog signal converter and a photovoltaic device, the digital / analog signal converter and the photovoltaic device are arranged correspondingly, and the photovoltaic device is connected with the corresponding digital / analog signal converter; the digital / analog signal converters are connected through analog signal lines; digital signals are transmitted between the photovoltaic devices and the corresponding digital / analog signal converters, analog signals are transmitted between the two digital / analog signal converters through analog signal lines, and the digital / analog signal converters are used for modulating the digital signals into analog signals or modulating the analog signals into the digital signals. The two digital / analog signal converters can be far away from each other, analog signals are transmitted between the two digital / analog signal converters through the analog signal line, the communication is stable, the transmission speed is higher than the transmission speed of digital signals, and the response speed of the whole photovoltaic system is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaic technology, and more particularly, to a photovoltaic system. Background Art

[0002] In a photovoltaic power generation system, it is usually necessary to collect and monitor the operation data of the devices in the photovoltaic power generation system. Information interaction is required between various devices, and the data is aggregated to a monitoring system for centralized management of the devices.

[0003] Since the photovoltaic power generation system is large in scale and may sometimes operate across regions, the devices are far apart from each other, and various communication methods are adopted. When the communication distance is far, the signal transmission is greatly affected by environmental factors, the signal transmission quality is reduced, and the transmission rate becomes slower. Summary of the Utility Model

[0004] In view of this, the present disclosure provides a photovoltaic system, including a digital / analog signal converter and a photovoltaic device. The digital / analog signal converter is correspondingly arranged with the photovoltaic device, and each photovoltaic device is connected to the corresponding digital / analog signal converter; two adjacent digital / analog signal converters are connected by an analog signal line; a digital signal is transmitted between the photovoltaic device and the corresponding digital / analog signal converter, and an analog signal is transmitted between the two digital / analog signal converters through the analog signal line. The digital / analog signal converter is used to modulate the digital signal into the analog signal or modulate the analog signal into the digital signal.

[0005] Optionally, the digital / analog signal converter is connected to the corresponding photovoltaic device through a digital signal line.

[0006] Optionally, the distance between the digital / analog signal converter and the corresponding photovoltaic device is less than a first preset threshold.

[0007] Optionally, the digital / analog signal converter is correspondingly arranged with at least one photovoltaic device.

[0008] Optionally, the photovoltaic system further includes a data collector and the digital / analog signal converter corresponding to the data collector. The data collector is connected to the corresponding digital / analog signal converter, and the digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to the photovoltaic device through an analog signal line.

[0009] Optionally, the data collector is connected to the corresponding digital / analog signal converter through a digital signal line.

[0010] Optionally, the distance between the digital / analog signal converter corresponding to the data collector and the data collector is less than a second preset threshold.

[0011] Optionally, data uplink transmission and data downlink transmission are performed between the photovoltaic device and the data collector;

[0012] The data uplink transmission includes: the photovoltaic device transmits a digital signal to the corresponding digital / analog signal converter, the digital / analog signal converter corresponding to the photovoltaic device modulates the digital signal into an analog signal, and transmits the analog signal to the digital / analog signal converter corresponding to the data collector through an analog signal line, and the digital / analog signal converter corresponding to the data collector demodulates the analog signal into a digital signal and then sends it to the data collector;

[0013] The data downlink transmission includes: the data collector transmits a digital signal to the digital / analog signal converter corresponding to the data collector, the digital / analog signal converter corresponding to the data collector modulates the digital signal into an analog signal, and transmits the analog signal to the digital / analog signal converter corresponding to the photovoltaic device through an analog signal line, and the digital / analog signal converter corresponding to the photovoltaic device demodulates the analog signal into a digital signal and then sends it to the photovoltaic device.

[0014] Optionally, the photovoltaic device is a photovoltaic inverter.

[0015] Optionally, the photovoltaic device is an integrated photovoltaic energy storage device.

[0016] The photovoltaic systems provided by multiple embodiments of the present application, the system includes a digital / analog signal converter and a photovoltaic device, the digital / analog signal converter is correspondingly arranged with the photovoltaic device, and the photovoltaic device is connected to the corresponding digital / analog signal converter; the digital / analog signal converters are connected by an analog signal line. The two digital / analog signal converters can be far apart, and the analog signal is transmitted between the two digital / analog signal converters through the analog signal line, with stable communication and a faster transmission speed compared to transmitting digital signals, improving the response speed of the entire photovoltaic system. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a photovoltaic system in a photovoltaic grid-connected scenario provided by the embodiment;

[0018] Figure 2 It is a schematic structural diagram of another photovoltaic system in a photovoltaic energy storage scenario provided by the embodiment;

[0019] Figure 3Schematic diagram of a photovoltaic system in a photovoltaic energy storage scenario provided for an embodiment;

[0020] Figure 4 Schematic diagram of another photovoltaic system in a photovoltaic energy storage scenario provided for an embodiment. Detailed implementation manners

[0021] To make the above objects, features, and advantages of the present disclosure more obvious and understandable, the following will describe the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0022] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependent relationships.

[0023] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0024] In the photovoltaic scenario, the distance between multiple inverters is relatively far; in the photovoltaic energy storage scenario, the distance between the main machine and the slave machine of the integrated photovoltaic and energy storage machine is also relatively far. When the communication distance is relatively far, the communication rate will become very slow, and the digital signal transmission is greatly affected by environmental factors, resulting in a reduction in the digital signal transmission quality and further reducing the digital signal transmission rate.

[0025] In view of the problems existing in the above related technologies, this embodiment provides a photovoltaic system.

[0026] As Figure 1As shown in the figure, a photovoltaic system provided by an embodiment of the present disclosure includes a digital / analog signal converter and a photovoltaic device. The digital / analog signal converter is correspondingly arranged with the photovoltaic device, and each photovoltaic device is connected to the corresponding digital / analog signal converter; the digital / analog signal converters are connected by an analog signal line; a digital signal is transmitted between the photovoltaic device and the corresponding digital / analog signal converter, and an analog signal is transmitted between two digital / analog signal converters through the analog signal line. The digital / analog signal converter is used to modulate the digital signal into the analog signal or modulate the analog signal into the digital signal.

[0027] Specifically, a digital / analog signal converter is an electronic device used to convert a digital signal into an analog signal or convert an analog signal into a digital signal. The digital / analog signal converter may include a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC). The DAC converts a digital signal into an analog signal, and the ADC converts an analog signal into a digital signal. The digital / analog signal converter modulates the digital signal into an analog signal, and the modulation method may be modulation methods such as FSK, BPSK, QPSK, OFDM, etc. Other modulation methods that can modulate a digital signal into an analog signal can also be used as the modulation method of the digital / analog signal converter. The modulation methods listed above do not limit the modulation method of the digital / analog signal converter. These digital / analog signal converters can be single-channel or multi-channel, and different precisions and speeds can be selected according to needs. An analog signal line is a communication line for transmitting analog signals. The analog signal line has a shielding layer. For example, a coaxial cable contains a braided mesh made of copper as the shielding layer, which helps shield the cable from electromagnetic interference (EMI). At the same time, the surrounding shielding layer prevents any signal loss (also known as attenuation loss) and ensures stable signal transmission. Shielded twisted pair has a metal shielding layer between the twisted pair and the outer insulating jacket, which can shield electromagnetic interference. During the transmission of analog signals, using a dedicated analog signal line can improve the stability of communication and the transmission process is not easily interfered.

[0028] As Figure 1 shown, multiple photovoltaic devices may be inverter 1#, inverter 2#, inverter 3#,..., inverter n-2#, inverter n-1# and inverter n#; as Figure 3 shown, the photovoltaic device may also be integrated energy storage unit 1#, integrated energy storage unit 2#, integrated energy storage unit 3#,..., integrated energy storage unit n-2#, integrated energy storage unit n-1# and integrated energy storage unit n#. The digital / analog signal converter is correspondingly arranged with at least one of the photovoltaic devices. As Figure 1 or Figure 3 shown, for example, the photovoltaic device can be connected to a digital / analog signal converter in a one-to-one correspondence; asFigure 2 or Figure 4 As shown, when two or more photovoltaic devices are in close proximity to a digital / analog signal converter, these photovoltaic devices can also be connected to the same digital / analog signal converter. The above example is only for illustrative purposes, and the number of photovoltaic devices corresponding to the digital / analog signal converter is not limited and can be adjusted adaptively according to actual needs. Two digital / analog signal converters are connected, and one of the digital / analog signal converters sends an analog signal to the other digital / analog signal converter through an analog signal line. All digital / analog signal converters are connected in sequence, as Figure 1 or Figure 3 shown, all the digital / analog signal converters corresponding to the photovoltaic devices are connected in sequence from beginning to end, as Figure 1 shown. For example, the digital / analog signal converter corresponding to Inverter 1# is connected to the digital / analog signal converter corresponding to Inverter 2#, the digital / analog signal converter corresponding to Inverter 2# is connected to the digital / analog signal converter corresponding to Inverter 3#,..., the digital / analog signal converter corresponding to Inverter n-2# is connected to the digital / analog signal converter corresponding to Inverter n-1#, and the digital / analog signal converter corresponding to Inverter n-1# is connected to the digital / analog signal converter corresponding to Inverter n#. The connection methods of the above-listed multiple digital / analog signal converters are only for illustrative purposes. The digital / analog signal converters can also be connected at intervals. As long as analog signal transmission is required between two digital / analog signal converters, the two digital / analog signal converters can be connected through an analog signal line, and the connection sequence of the digital / analog signal converters is not limited.

[0029] In this embodiment, the digital / analog signal converter is set corresponding to the photovoltaic device. Each photovoltaic device is connected to the corresponding digital / analog signal converter. The photovoltaic device that emits a digital signal serves as the sending end, and the photovoltaic device that receives the digital signal serves as the receiving end. The sending end transmits the digital signal to its corresponding digital / analog signal converter. The digital / analog signal converter corresponding to the sending end modulates the digital signal into an analog signal and transmits the analog signal to the digital / analog signal converter corresponding to the receiving end through the analog signal line. The digital / analog signal converter corresponding to the receiving end demodulates the analog signal into the digital signal and transmits the digital signal to the receiving end, thereby achieving the purpose of transmitting the digital signal sent by one photovoltaic device to another photovoltaic device. During this process, the two digital / analog signal converters can be far apart, and the analog signal is transmitted between the two digital / analog signal converters through the analog signal line. The communication is stable, and the transmission speed is relatively fast compared to transmitting digital signals, improving the response speed of the entire photovoltaic system.

[0030] Optionally, the digital / analog signal converter is connected to the corresponding photovoltaic device via a digital signal line.

[0031] Specifically, digital signal lines are often used to transmit digital signals to remote locations. These lines can be buses such as UART and RS485. They can also be cables of different types, such as coaxial cables, twisted pairs, and optical fibers. The examples above do not limit the specific type of digital signal line; any cable capable of transmitting digital signals can serve as a digital signal line.

[0032] Optionally, the distance between the digital / analog signal converter and the corresponding photovoltaic device is less than a first preset threshold. For example, the first preset threshold can be set between 0 and 50 meters. The specific value of the first preset threshold can be set according to actual needs to limit the digital / analog signal converter to be arranged around the photovoltaic device. For example, the distance between the digital / analog signal converter and the corresponding photovoltaic device is less than 50 meters. The value range and specific value of the first preset threshold can be set according to actual needs. The ranges and values listed in the above examples are only for ease of understanding and are not intended to limit the first preset threshold. When the digital / analog signal converter is arranged in close proximity to the photovoltaic device, the digital signal transmission distance is short and the propagation speed is fast.

[0033] Optionally, the photovoltaic system further includes a data collector and a digital / analog signal converter corresponding to the data collector, the data collector is connected to the corresponding digital / analog signal converter, and the digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to the photovoltaic device.

[0034] Specifically, if Figure 1 As shown, the data collector is connected to the digital / analog signal converter, and the digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to inverter 1#. The digital / analog signal converter corresponding to the data collector converts the digital signal into an analog signal, and the digital / analog signal converter corresponding to the data collector sends the converted analog signal to the digital / analog signal converter corresponding to inverter 1#, so as to transmit the analog signal over a long distance. Then, the digital / analog signal converter corresponding to inverter 1# converts the analog signal into a digital signal and sends it to inverter 1#, so as to transmit the digital signal over a short distance, thereby improving the speed of data transmission. In addition, at least one data collector is set corresponding to a digital / analog signal converter, such as Figure 1 As shown, a data collector is set up corresponding to a digital / analog signal converter, or it can be set up as follows Figure 2As shown, two or more data collectors are correspondingly arranged with a digital / analog signal converter. The number of data collectors corresponding to the digital / analog signal converter is not limited and can be adaptively adjusted according to the requirements for the data collectors.

[0035] In this embodiment, the digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to the photovoltaic device through an analog signal line. Data upstream transmission and data downstream transmission are performed between the photovoltaic device and the data collector; the data upstream transmission includes: the photovoltaic device transmits a digital signal to the corresponding digital / analog signal converter, the digital / analog signal converter corresponding to the photovoltaic device modulates the digital signal into an analog signal, and transmits the analog signal through the analog signal line to the digital / analog signal converter corresponding to the data collector, and the digital / analog signal converter corresponding to the data collector demodulates the analog signal into a digital signal and then sends it to the data collector; the data downstream transmission includes: the data collector transmits a digital signal to the digital / analog signal converter corresponding to the data collector, the digital / analog signal converter corresponding to the data collector modulates the digital signal into an analog signal, and transmits the analog signal through the analog signal line to the digital / analog signal converter corresponding to the photovoltaic device, and the digital / analog signal converter corresponding to the photovoltaic device demodulates the analog signal into a digital signal and then sends it to the photovoltaic device.

[0036] Optionally, the data collector is connected to the corresponding digital / analog signal converter through a digital signal line. The distance between the digital / analog signal converter corresponding to the data collector and the data collector is less than a second preset threshold. Exemplarily, the second preset threshold can be set within the range of 0 - 100 m, and the specific value of the second preset threshold can be set according to actual requirements to limit the layout of the digital / analog signal converter around the data collector. For example, if the distance between the digital / analog signal converter and the corresponding data collector is less than 30 m, the digital / analog signal converter can be set at any position within 30 m around the data collector. The value range and specific value of the second preset threshold can be set according to actual requirements. The ranges and values listed in the above examples are only for easy understanding and do not limit the second preset threshold. Since the data collector and the digital / analog signal converter are relatively close, a dedicated digital signal line is used, and the digital signal transmission process is less affected by interference, enabling stable signal transmission. The digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to a photovoltaic device through an analog signal line, and the analog signal is transmitted between the digital / analog signal converter corresponding to the data collector and the digital / analog signal converter corresponding to a photovoltaic device through the analog signal line. By using a dedicated analog signal line with a shielding layer, the shielding layer can shield the electromagnetic interference around the cable, enabling stable transmission of the analog signal and reducing the loss of the analog signal, thereby increasing the stability of the transmission.

[0037] Optionally, as Figure 1 shown, the photovoltaic device can be a photovoltaic inverter.

[0038] Specifically, the communication data is divided into uplink data and downlink data. In the scenario of photovoltaic grid connection, the uplink data is defined as the data initiated by the photovoltaic inverter and transmitted to the data collector, and the downlink data is defined as the data initiated by the data collector and transmitted to the photovoltaic inverter.

[0039] Process of downlink data communication: The data collector transmits the data to be transmitted in the form of a digital signal to the digital / analog signal converter. The digital / analog signal converter modulates the digital signal into an analog signal. The modulation method can be modulation methods such as FSK, BPSK, QPSK, OFDM, etc. Other modulation methods that can modulate digital signals into analog signals can also be used as the modulation method of the digital / analog signal converter. The modulation methods listed above do not limit the modulation method of the digital / analog signal converter. The analog signal is transmitted in the analog signal line, and the digital / analog signal converter corresponding to the photovoltaic inverter demodulates the analog signal into a digital signal and then transmits it to the photovoltaic inverter for processing, so as to achieve the purpose of communication between the data collector and the photovoltaic inverter.

[0040] Process of realizing upstream data communication: The PV inverter transmits the data to be transmitted in the form of digital signals to the digital / analog signal converter. The digital / analog signal converter modulates the digital signals into analog signals. The analog signals are transmitted in the analog signal lines. The digital / analog signal converter corresponding to the data collector demodulates the analog signals into digital signals and then sends them to the data collector for processing, so as to achieve the purpose of communication between the PV inverter and the data collector. When the data is transmitted from one PV inverter to another adjacent PV inverter, the same data transmission process is also used.

[0041] In addition, when the data collected by the data collector is transmitted to other PV inverters through a PV inverter (Inverter 1#), for example, the data of the data collector is transmitted to Inverter 2#. At this time, the devices through which the data is transmitted are the data collector, the digital / analog signal converter corresponding to the data collector, the digital / analog signal converter corresponding to Inverter 1#, the digital / analog signal converter corresponding to Inverter 2#, and Inverter 2#. The data collector sends out digital signals, which are converted into analog signals when reaching the digital / analog signal converter corresponding to the data collector, and reach the digital / analog signal converter corresponding to Inverter 1#. The digital / analog signal converter corresponding to Inverter 1# converts the analog signals into digital signals and sends them to Inverter 1#, and then sends the analog signals to the digital / analog signal converter corresponding to Inverter 2#. The digital / analog signal converter corresponding to Inverter 2# converts the analog signals into digital signals and sends them to Inverter 2#, thus completing the communication between the data collector and Inverter 2#.

[0042] Optionally, as Figure 3 shown, the PV device can be an integrated PV and energy storage device, which refers to a device that integrates PV power generation components and an energy storage system, reducing the floor area. Select one of the multiple integrated PV and energy storage devices as the master device, and the rest of the integrated PV and energy storage devices as slave devices. For example Figure 3 in, the integrated PV and energy storage device 1# is used as the master device, and the rest of the integrated PV and energy storage devices are used as slave devices. This is an exemplary illustration, not a limitation that it must be the integrated PV and energy storage device 1# as the master device. Other integrated PV and energy storage devices can also be selected as the master device, and the integrated PV and energy storage devices other than the master device are slave devices.

[0043] Specifically, the communication data is divided into upstream data and downstream data. In the PV energy storage scenario, the upstream data is defined as the data initiated by the slave integrated PV and energy storage device and transmitted to the master integrated PV and energy storage device, and the downstream data is defined as the data initiated by the master integrated PV and energy storage device and transmitted to the slave integrated PV and energy storage device.

[0044] Downlink data communication implementation process: The host of the integrated PV energy storage system transmits the data to be transmitted in the form of digital signals to the digital / analog signal converter. The digital / analog signal converter modulates the digital signals into analog signals. The modulation methods can be FSK, BPSK, QPSK, OFDM, etc. Other modulation methods that can modulate digital signals into analog signals can also be used as the modulation methods of the digital / analog signal converter. The modulation methods listed above do not limit the modulation methods of the digital / analog signal converter. The analog signals are transmitted in the analog signal line. The digital / analog signal converter corresponding to the slave of the integrated PV energy storage system demodulates the analog signals into digital signals, and then the digital / analog signal converter sends the digital signals to the corresponding slave of the integrated PV energy storage system for processing, so as to achieve the purpose of communication between the host and the slave.

[0045] Uplink data communication implementation process: The slave of the integrated PV energy storage system transmits the data to be transmitted in the form of digital signals to the digital / analog signal converter. The digital / analog signal converter converts and modulates the digital signals into analog signals. The analog signals are transmitted in the analog signal line. The digital / analog signal converter corresponding to the host of the integrated PV energy storage system demodulates the analog signals into digital signals, and then the digital / analog signal converter sends the digital signals to the corresponding host of the integrated PV energy storage system for processing, so as to achieve the purpose of communication between the slave and the host.

[0046] In the present disclosure, by using the solution in the above embodiment, the problem of slow signal transmission rate can be solved. Each of the photovoltaic devices is connected to the corresponding digital / analog signal converter. For example, two photovoltaic devices are respectively connected to a digital / analog signal converter. One photovoltaic device transmits digital signals to a digital / analog signal converter. The digital / analog signal converter converts the digital signals into analog signals and transmits the analog signals to another digital / analog signal converter through the analog signal line. The other digital / analog signal converter converts the analog signals into digital signals and transmits the digital signals to another photovoltaic device, thus achieving the purpose of transmitting the digital signals sent by one photovoltaic device to another photovoltaic device. In this process, the two digital / analog signal converters can be far apart. The analog signals are transmitted between the two digital / analog signal converters through the analog signal line. The communication is stable and the transmission speed is faster than that of transmitting digital signals, improving the response speed of the entire photovoltaic system. When the above digital / analog signal converter is applied to the photovoltaic grid-connected scenario or the industrial and commercial photovoltaic energy storage scenario, the analog signals are not easily interfered by the outside world during transmission in the analog signal line.

[0047] Although the present disclosure is disclosed as above, the present disclosure is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A photovoltaic system, characterized in that, It includes a digital / analog signal converter and a photovoltaic device. The digital / analog signal converter is correspondingly arranged with the photovoltaic device, and the photovoltaic device is connected to the corresponding digital / analog signal converter; the digital / analog signal converters are connected by analog signal lines; digital signals are transmitted between the photovoltaic device and the corresponding digital / analog signal converter, and analog signals are transmitted between two digital / analog signal converters through the analog signal line. The digital / analog signal converter is used to modulate the digital signal into the analog signal or modulate the analog signal into the digital signal.

2. The photovoltaic system according to claim 1, wherein The digital / analog signal converter is connected to the corresponding photovoltaic device through a digital signal line.

3. The photovoltaic system according to claim 1, characterized in that, The distance between the digital / analog signal converter and the corresponding photovoltaic device is less than a first preset threshold.

4. The photovoltaic system according to claim 1, characterized in that The digital / analog signal converter is correspondingly arranged with at least one photovoltaic device.

5. The photovoltaic system according to claim 1, wherein It further includes a data collector and the digital / analog signal converter corresponding to the data collector. The data collector is connected to the corresponding digital / analog signal converter, and the digital / analog signal converter corresponding to the data collector is connected to the digital / analog signal converter corresponding to the photovoltaic device through an analog signal line.

6. The photovoltaic system according to claim 5, characterized in that, The data collector is connected to the corresponding digital / analog signal converter through a digital signal line.

7. The photovoltaic system according to claim 5, characterized in that, The distance between the digital / analog signal converter corresponding to the data collector and the data collector is less than a second preset threshold.

8. The photovoltaic system according to claim 5, wherein Data uplink transmission and data downlink transmission are carried out between the photovoltaic device and the data collector; The data uplink transmission includes: the photovoltaic device transmits a digital signal to the corresponding digital / analog signal converter, the digital / analog signal converter corresponding to the photovoltaic device modulates the digital signal into an analog signal, and transmits the analog signal through the analog signal line to the digital / analog signal converter corresponding to the data collector. The digital / analog signal converter corresponding to the data collector demodulates the analog signal into a digital signal and then sends it to the data collector; The data downlink transmission includes: the data collector transmits a digital signal to the digital / analog signal converter corresponding to the data collector. The digital / analog signal converter corresponding to the data collector modulates the digital signal into an analog signal, and transmits the analog signal through the analog signal line to the digital / analog signal converter corresponding to the photovoltaic device. The digital / analog signal converter corresponding to the photovoltaic device demodulates the analog signal into a digital signal and then sends it to the photovoltaic device.

9. The photovoltaic system according to claim 1, characterized in that, The photovoltaic device is a photovoltaic inverter.

10. The photovoltaic system according to claim 1, wherein, The photovoltaic device is an integrated energy storage and photovoltaic system.

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