Header box communication system based on HPLC high-speed power line carrier communication

Abstract

The invention discloses a combiner box communication system based on HPLC (High Performance Liquid Chromatography) high-speed power line carrier communication. The combiner box communication system comprises a signal isolation processing module, a filter circuit, a power amplification circuit, an HPLC chip and a microprocessor, when a box transformer substation system needs parameters in each combiner box system, a query instruction is sent out according to an agreed communication protocol format, and data is sent out through a magnetic ring and a power line; after the combiner box communication system of the corresponding address receives the instruction of inquiring the voltage value, data signal processing and filtering processing are carried out in the combiner box communication system, instruction information is transmitted to the microprocessor through the HPLC chip, and the microprocessor analyzes the received instruction and sends out a parameter value appointed to be inquired through the HPLC chip; and the magnetic ring on the power line of the box transformer substation system receives the data signal and analyzes the data signal through the internal HPLC module. The system is suitable for occasions such as a photovoltaic power station and a wind power plant where a plurality of distributed energy devices need to be remotely monitored, the operation and maintenance efficiency can be effectively improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power communication, in particular to a combiner box communication system based on HPLC high-speed power line carrier communication. Background Art

[0002] In recent years, the global photovoltaic industry has developed well. With the continuous advancement of photovoltaic technology and the continuous decline in costs, more and more countries and regions have begun to vigorously develop the photovoltaic industry, which has led to increasingly fierce competition in the international market.

[0003] At present, most of the combiner box monitoring systems on the market use traditional wired and wireless communication methods. In the wired communication method, separate communication lines need to be set up between combiner boxes, and between combiner boxes and inverters, box transformers, and communication management machines in order to communicate and control data. This not only brings difficulties to construction, but also increases the line failure rate and various maintenance costs.

[0004] Meanwhile, the maximum transmission distance of traditional RS-485 communication using cables is mainly affected by the transmission rate. At a transmission rate of 100kb / s, RS-485 communication can reach its maximum transmission distance, which is about 1200 meters. However, when the transmission rate increases, the transmission distance will decrease accordingly. For example, at a higher transmission rate, such as 10Mb / s, the transmission distance will be significantly shortened.

[0005] Wireless transmission is more easily affected by the environment, and the transmission distance is also restricted. Data transmission between devices is easily interfered by the same frequency signal, and cannot work stably and reliably in extreme weather and adverse terrain environments. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of existing traditional wired and wireless transmission technologies, and to provide a junction box communication system based on HPLC high-speed power line carrier communication, in which data transmission between the system and external devices is carried out through on-site power lines, thereby reducing on-site wiring links and improving the efficiency of installation and commissioning; at the same time, the flexibility and mobility of the installation operation are improved, and the ability to resist external interference is also improved.

[0007] According to the technical solution provided by the present invention, the combiner box communication system based on HPLC high-speed power line carrier communication includes: a signal isolation processing module, a filter circuit, a power amplifier circuit, a high-speed power line carrier communication chip and a microprocessor;

[0008] The signal isolation processing module is connected to the power line between the combiner box and the box-type transformer system, and is used to obtain the carrier signal from the power line, isolate the high-voltage signal, and process the signal; the signal isolation processing module is connected to the high-speed power line carrier communication chip through the filter circuit and the power amplifier circuit respectively, and the high-speed power line carrier communication chip is connected to the microprocessor of the combiner box monitoring system;

[0009] The filtering circuit is used to further filter the carrier signal processed by the signal isolation processing module and transmit it to the high-speed power line carrier communication chip;

[0010] The power amplifier circuit is used to amplify the signal sent by the high-speed power line carrier communication chip, and then transmit it to the power line through the signal isolation processing module;

[0011] The high-speed power line carrier communication chip is used to modulate the information data in the microprocessor to a suitable carrier frequency, or demodulate the carrier signal on the power line to achieve communication and control between data terminals;

[0012] When the box-type transformer system needs the parameters in each combiner box system, it will issue a query command in accordance with the agreed communication protocol format, and send the data through the magnetic ring and power line; after the combiner box communication system with the corresponding address receives the command to query the voltage value, it will perform data signal processing and filtering internally, and pass the command information to the microprocessor through the high-speed power line carrier communication chip. The microprocessor parses the received command, confirms that the address in the command is consistent with the address set by this system, and after the check code information is correct, the specified queried parameter value is sent out through the high-speed power line carrier communication chip; the magnetic ring on the power line of the box-type transformer system receives the data signal and parses it through the internal high-speed power line carrier communication module.

[0013] Among them, the box transformer system serves as the HPLC master node, and each junction box communication system serves as the HPLC slave node. The data output between the HPLC master and slave nodes adopts a fixed-point transmission and reception mode. The node needs to add the target line number and the slave node device address before sending the data packet. Only the slave node whose target line number and slave node device address match can receive the data sent by the master node.

[0014] Specifically, the communication protocol format of the master node query instruction is: target line number + slave node device address + function code + register address + number of registers + check code, and the communication protocol format of the slave node sending data instruction is: target line number + slave node device address + function code + number of bytes + register data + check code; here the function code is the "read" function code, and the number of bytes is the number of registers occupied by the specific data value when the slave node replies to the query instruction.

[0015] The function codes in the communication protocol of the present invention are divided into: "read" function code, "set" function code, "wake up" function code, "alarm" function code, "IV curve scanning" function code, "current detection" function code, and "arc detection" function code.

[0016] The "read" function code is divided into: 0x50 represents reading a single bit, 0x60 represents reading multiple bits, 0x51 represents reading a single word, and 0x61 represents reading multiple words.

[0017] The "setting" function code is divided into: 0x70 represents setting a single bit, 0x80 represents setting multiple bits, 0x71 represents setting a single word, and 0x81 represents setting multiple word.

[0018] The register address refers to the register address agreed to store the specified parameters or data. The parameters include: circuit breaker status, lightning arrester status, bus voltage warning value status, current warning value status, temperature warning status. The data includes: bus voltage, current value of each photovoltaic string, temperature value, humidity value, total current value, total power value, and total power generation value;

[0019] The registers are divided into registers with bit or word as units according to different function codes. The number of registers refers to the number of stored data or parameter values. The number of occupied registers varies according to the different stored content values.

[0020] Furthermore, the high-speed power line carrier communication chip module integrates a radio frequency communication module and supports dual-mode and single-mode communication protocol modes. In the dual-mode mode, the system parameters can be remotely configured or read through the matching wireless remote control; enter the setting mode on the remote control, enter the parameter value, slave node device address and power line number in the system parameter interface, and send the setting instruction through the radio frequency signal. After the junction box communication system receives the instruction, it parses the instruction and changes the local parameters; when it is necessary to read the system parameters of a certain node, directly select the query object in the remote control interface and click the read or query button. After the queried node receives the query instruction, it immediately sends the return value to the remote control for display through the wireless radio frequency signal.

[0021] The system supports two signal coupling modes, namely high-voltage direct coupling and magnetic ring coupling. The master and slave nodes can use the same coupling mode or different coupling modes. There are three combinations in total: ⑴ Both the master and slave nodes use high-voltage direct coupling, ⑵ Both the master and slave nodes use magnetic ring coupling, ⑶ One end uses high-voltage direct coupling and the other end uses magnetic ring coupling.

[0022] The present invention has strong expansibility. When it is necessary to add an entire array of photovoltaic strings, the array is connected to the magnetic ring coupling interface reserved by the master node; when it is necessary to add a node in the existing array, a new slave node is connected in parallel to the existing slave node of the target line number, and the new slave node can monitor the working conditions of other slave nodes in the array or the domain control, and the new slave node device address is different from the existing slave node device address; when it is necessary to move the existing slave node to other arrays, it is only necessary to modify the corresponding line number of the slave node end or the master node end to the new line number, so as to form a new communication network topology.

[0023] The advantages of the present invention are:

[0024] 1. The present invention adopts broadband power line carrier communication chip to realize the transmission and control of signal data on the photovoltaic field PV busbar, and transmits data in real time between the combiner box end and the inverter end without other physical line connections, reducing the complexity and cost of wiring. Broadband power line carrier technology supports low-power long-distance communication, and the slave node can transmit the operation data of the combiner box to the HPLC master node in real time.

[0025] The present invention supports a transmission distance of 1500 meters for point-to-point communication between master and slave nodes. The signal quality of broadband power carrier is usually better than that of narrowband power carrier communication, which means a longer transmission distance and less signal attenuation. If long-distance transmission is required or the stability of signal quality needs to be ensured, broadband power carrier communication is a better choice.

[0026] The present invention supports a communication rate range of 115Kbps to 200Kbps between master and slave nodes, adapts to most existing field communication speed and data transmission time requirements, and greatly improves the response requirements of slave nodes, master nodes and customer backgrounds.

[0027] The present invention supports a power carrier frequency range of 0.7-12MHz between master and slave nodes, which belongs to a medium-high frequency broadband power carrier. Different from narrowband power carrier communication technology, the system can transmit more data or services at the same time, making it more suitable for occasions requiring high-speed transmission. The data transmission protocol is more complex and not easily interfered or attacked.

[0028] 2. The present invention supports direct access of high voltage within 2500V DC to the master-slave module. The signal input end of the system is equipped with a high-voltage isolation circuit module and a signal processing circuit, which can safely isolate high and low voltages and process clutter signals, ensuring that the master-slave module can be used in DC high-voltage application locations.

[0029] 3. The present invention supports dual-mode and single-mode communication protocol modes, and the single-mode and dual-mode protocols support interconnection. In the dual-mode communication mode, the monitoring center or cloud platform can remotely control the junction box to perform parameter configuration, troubleshooting and other operations to improve operation and maintenance efficiency.

[0030] 4. The present invention supports the domain control gateway networking mode. A single domain control master node can access 200 slave nodes at the same time. The data packet loss rate of communication between the master and slave nodes is no more than 1%, ensuring normal data communication between domain control nodes.

[0031] In summary, the present invention is applicable to occasions such as photovoltaic power stations and wind farms where multiple distributed energy devices need to be remotely monitored, and can effectively improve operation and maintenance efficiency and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of electrical connection between the HPLC combiner box communication system and the box transformer system of the present invention.

[0033] Figure 2 It is a hardware block diagram of the present invention applied in a combiner box monitoring system.

[0034] Figure 3 This is the master-slave node domain control network topology diagram. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The present invention is a combiner box communication system based on high-speed power line carrier communication, referred to as HPLC combiner box communication system, which is an intelligent system that uses power line carrier technology to achieve remote monitoring and data transmission of combiner boxes. The system aims to achieve real-time monitoring and management of multiple combiner boxes in photovoltaic power plants, and achieve remote, efficient and stable data transmission through power line carrier communication technology, thereby improving the operation and maintenance efficiency and safety of photovoltaic power plants. Figure 2 As shown, the system includes a signal isolation processing module 1, a filter circuit 2, a power amplifier circuit 3, a high-speed power line carrier communication chip 4 and a single-chip computer 5 (microprocessor). The microprocessor is the single-chip computer 5 of the original combiner box monitoring system. The signal isolation processing module 1 is installed inside the combiner box monitoring system and connected to the power line between the combiner box and the box transformer system. It is used to obtain the carrier signal from the power line, isolate the high-voltage signal, and process the signal; the signal isolation processing module 1 is connected to the high-speed power line carrier (HPLC) communication chip 4 through the filter circuit 2 and the power amplifier circuit 3 respectively, and the high-speed power line carrier communication chip 4 is connected to the single-chip computer 5 of the combiner box monitoring system. The high-speed power line carrier communication chip 4 is connected to the external antenna to ensure that the wireless communication distance between the master and slave nodes can reach more than 2KM.

[0037] The filtering circuit 2 is used to further filter the carrier signal processed by the signal isolation processing module 1, filter out the clutter signal, and transmit the useful signal to the high-speed power line carrier communication chip 4; the power amplifier circuit 3 is used to amplify the signal sent by the high-speed power line carrier communication chip 4, and then transmit it to the power line through the signal isolation processing module 1; the high-speed power line carrier communication chip 4 is used to modulate the information data in the single-chip computer 5 to a suitable carrier frequency, or demodulate the carrier signal on the power line, to realize communication and control between data terminals.

[0038] The single-chip computer 5 of the combiner box monitoring system is also connected to an LCD display module 6, a power module 7, a touch button 8, an RS485 communication module 9, a signal detection module 10, and an energy storage tripping module 11. The single-chip computer 5 is used to monitor the bus voltage, the current of each branch, temperature, humidity, the state of the circuit breaker, the state of the lightning arrester, etc., detect whether there is a key signal input, drive the LCD screen display, communicate with the communication chip in real time, handle data transmission and reception problems, and send instructions to the energy storage tripping module 11 to perform a tripping action when the system detects an abnormal situation. The LCD display module 6 is used to display the bus voltage, the current of each branch, temperature, humidity, and various state values ​​in real time. The touch button 8 is used to set various system parameters, such as the upper and lower limits of the bus voltage warning, the upper and lower limits of the current warning, the baud rate value, etc. The signal detection module 10 is used to detect the state of the circuit breaker and the lightning arrester in real time, and also includes a temperature and humidity sensor, etc. In addition to the HPLC power carrier communication function, the system also retains the RS485 communication circuit and interface for access to other detection equipment or modules.

[0039] Figure 1 There are n photovoltaic strings ZC1~ZCn, which are connected to the magnetic rings C1~Cn of the box transformer system through power lines PV1~PVn respectively. n HPLC combiner box communication systems S1~Sn are connected to the photovoltaic power lines PV1~PVn respectively.

[0040] When the box-type transformer system or the customer backend queries the data or status of the combiner box through power line carrier communication, this system will immediately reply the data information to the box-type transformer system or the customer backend through the power line. The specific communication process is:

[0041] When the box-type transformer system needs the voltage, current, temperature, power and other parameters in each junction box system, it will issue a command to query a parameter in a junction box at a specific address according to the agreed communication protocol format. For example, the command to query the voltage of the junction box at the address "01" is: 01 (target line number) 01 (slave node device address) 51 (function code) 01 04 (register address) 00 01 (number of registers) 76 20 (check code), and the signal is sent out through the coupling magnetic ring and power line. 51 represents the "read" function code, and 01 04 is the register address for storing the voltage value. Registers are divided into registers in bit or word units according to different function codes. According to different stored content values, the number of registers can be 1 or more, and the number of registers is the number of stored data and parameter values. After receiving the query command, the HPLC combiner box communication system corresponding to the line number and address performs data signal processing and filtering internally, and transmits the command information to the single-chip microcomputer 5 through the high-speed power line carrier communication chip 4. The single-chip microcomputer 5 analyzes the received command, confirms that the slave node device address 01 is consistent with the address set by the system, and the command content is to query the register address storing the voltage value. After the check code information is correct, the system sends the voltage value at that time through the high-speed power line carrier communication chip 4. The sending protocol format is: 01 (target line number) 01 (slave node device address) 51 (function code) 02 (byte number) 02BC (register data) 8D E7 (check code). The number of bytes is the number of registers occupied by the specific data value or status value when replying to the query command. For example, the status flag (0 or 1) can use a 1 BIT register, and the bus voltage value (1500V) can use a WORD register. The coupled magnetic ring in the box transformer system receives the data signal and analyzes the carrier signal through the internal main HPLC module, and transmits the voltage value 0x02bc to the inverter through the RS485 protocol.

[0042] There are 13 function codes, including query / read (0x50 for reading a single bit, 0x60 for reading multiple bits, 0x51 for reading a single word, 0x61 for reading multiple words), set (0x70 for setting a single bit, 0x80 for setting multiple bits, 0x71 for setting a single word, 0x81 for setting multiple words), wake-up (0x30), alarm (0x50), IV curve scan (0x80), current arc detection (current detection 0x90, arc detection 0x91).

[0043] The register address refers to the register address agreed to store the specified parameters or data. The data includes bus voltage, current value of each photovoltaic string, temperature value, humidity value, total current value, total power value, total power generation value, etc.; the parameters include circuit breaker status, lightning arrester status, bus voltage warning value status, current warning value status, temperature warning status, etc.

[0044] In the present invention, the box transformer system is used as the HPLC master node, and each combiner box communication system is used as the HPLC slave node. The data output between the HPLC master and slave nodes adopts a fixed-point transmission and reception mode. Before sending data, each node adds the target line number and the slave node device address before the data. Only the slave module whose target line number and the slave node device address match can receive the data sent by the master node.

[0045] The present invention adopts power line carrier modulation and demodulation technology, which brings a longer communication distance and stronger anti-interference ability. In addition, the high-speed power line carrier chip module of the present invention also has a radio frequency communication module. The HPLC communication chip has two working modes: dual-mode and single-mode. The carrier supports a wide range of working frequency bands of 0.7-12MHz, and the radio frequency supports 470M-510M (domestic) and 800M-900M (foreign) working frequency bands. The system can set the communication carrier frequency band and the radio frequency band according to the actual application scenario. The dual-mode and single-mode communication protocol modes support interconnection. In the dual-mode communication mode, the monitoring center or cloud platform can remotely control the junction box to perform parameter configuration, troubleshooting and other operations. Troubleshooting refers to the ability to quickly discover whether a node is online (online status), packet loss, transmission delay, communication rate and other parameters on the monitoring center or cloud platform. Whether the expected value is reached.

[0046] In dual-mode mode, the system parameters (such as slave node device address, number of strings, bus voltage warning value, current (overcurrent) warning value, etc.) can be remotely configured or read through the matching wireless remote control, avoiding the need to disconnect the power supply and unpack the configuration parameters on site. For example, if the channel current (overcurrent) warning value is set to 32A, the system will enter the warning protection state when the value exceeds this value. The method is: press the setting button on the matching remote control to enter the setting mode, then enter the channel current overcurrent upper limit setting interface, adjust the upper limit to 32, change the target line number and slave node device address to the value to be set, and then press the setting function key to send the setting instruction information through the wireless radio frequency signal. The setting instruction is: 01 (target line number) 01 (slave node device address) 71 ("setting" function code) 02 3C (storage current overcurrent value register address) 00 23 (channel current overcurrent value) F6 77 (check code). After receiving the instruction, the corresponding slave node's combiner box communication system parses the relevant information in the instruction and changes the local channel current overcurrent value to 32A.

[0047] Before system configuration or during subsequent maintenance, if you need to read the system parameters of a certain node, you can directly click the read (or query, which have the same meaning in the present invention) button in the remote control interface. After the queried node receives the query command, it will promptly send the return value to the remote control interface through a wireless radio frequency signal and display it.

[0048] The present invention has strong scalability, and the system supports flexible multi-node access, which is convenient for expanding the monitoring range and functions in the future. The number of slave nodes can be increased, decreased, or the position of slave nodes can be adjusted according to the actual operation of the power station. There are three situations in the later maintenance. One is that the capacity of the photovoltaic string needs to be increased on site, and an entire array of photovoltaic strings will be added; the second is to add monitoring system nodes to an existing array; the third is to divide the original monitoring system nodes into other arrays. If the above situations are encountered, the system can be flexibly constructed on site, and the installation location is convenient and flexible, and is not restricted by communication lines and communication addresses.

[0049] like Figure 3 As shown, in case 1, the master node module on the box-type transformer system side has the function of connecting up to 16 slave nodes at the same time, and 16 coupling magnetic rings need to be configured. During normal use, 7-10 slave nodes are connected. If the entire array PVx needs to be temporarily increased, it can be connected to the remaining reserved magnetic ring coupling interface, corresponding to the power line PVx.

[0050] Case 2: If a system node is added to the existing matrix, a new slave node can be connected in parallel to the slave node Sx at the end of the target line number PVx to monitor the working conditions of other slave nodes in this matrix or domain control. However, the address of the new slave node cannot be the same as the address of Sx.

[0051] Case 3: If one or some existing slave nodes are moved to other arrays, it is only necessary to change the corresponding line number PVx at the slave node end or the master node end to PVy to form a new communication network topology without excessive debugging and installation. x, y represent any positive integers, and x is not equal to y.

[0052] The present invention can realize wireless signal wake-up in the air, and wake up the high-speed power line carrier chip, which also wakes up the entire combiner box monitoring system. When the system is in a dormant state, the radio frequency communication module of other authorized nodes (domain control master node or handheld remote control) can issue a wake-up command to allow the system to enter a normal working state from a dormant state.

[0053] The high-speed power line carrier communication chip module of the present invention adopts leading orthogonal frequency division multiplexing modulation and demodulation (OFDM) technology, efficient and reliable forward error correction technology, and flexible and configurable transmission mode, and can achieve adaptive and reliable communication in power line environments with severe signal attenuation and strong interference.

[0054] When the power supply is isolated, the environment is shielded, there is no competition, the master-slave node ratio is 1:1, and the physical layer data packet size is tested to be 512 and 1024 bytes, the communication rate is not less than 1Mbps, and the maximum communication rate of the present invention can reach 10Mbps.

Claims

1. A combiner box communication system based on HPLC high-speed power line carrier communication, characterized in that: It comprises a signal isolation processing module (1), a filter circuit (2), a power amplifier circuit (3), a high-speed power line carrier communication chip (4) and a microprocessor; The signal isolation processing module (1) is connected to the power line between the combiner box and the box-type transformer system, and is used to obtain a carrier signal from the power line, isolate the high-voltage signal, and process the signal; the signal isolation processing module (1) is connected to a high-speed power line carrier communication chip (4) through a filter circuit (2) and a power amplifier circuit (3), respectively, and the high-speed power line carrier communication chip (4) is connected to a microprocessor of the combiner box monitoring system; The filtering circuit (2) is used to further filter the carrier signal processed by the signal isolation processing module (1) and transmit it to the high-speed power line carrier communication chip (4); The power amplifier circuit (3) is used to amplify the signal sent by the high-speed power line carrier communication chip (4), and then transmit it to the power line through the signal isolation processing module (1); The high-speed power line carrier communication chip (4) is used to modulate information data in the microprocessor onto a suitable carrier frequency, or demodulate the carrier signal on the power line, to achieve communication and control between data terminals; When the box-type transformer system needs the parameters in each junction box system, it will issue a query command in accordance with the agreed communication protocol format, and send the data through the magnetic ring and the power line; after the junction box communication system with the corresponding address receives the command to query the voltage value, it performs data signal processing and filtering internally, and transmits the command information to the microprocessor through the high-speed power line carrier communication chip (4); the microprocessor parses the received command, confirms that the address in the command is consistent with the address set by the system, and after the check code information is correct, the parameter value specified for query is sent out through the high-speed power line carrier communication chip (4); the magnetic ring on the power line of the box-type transformer system receives the data signal and parses it through the internal high-speed power line carrier communication module.

2. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 1, characterized in that: The box-type transformer system serves as the HPLC master node, and each combiner box communication system serves as the HPLC slave node. The data output between the HPLC master and slave nodes adopts a fixed-point transmission and reception mode. The node needs to add the target line number and the slave node device address before sending the data packet. Only the slave node whose target line number and slave node device address match can receive the data sent by the master node.

3. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 2, characterized in that: The communication protocol format of the master node query instruction is: target line number + slave node device address + function code + register address + number of registers + check code. The communication protocol format of the slave node sending data instruction is: target line number + slave node device address + function code + number of bytes + register data + check code. Here the function code is the "read" function code, and the number of bytes is the number of registers occupied by the specific data value when the slave node replies to the query instruction.

4. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 3, characterized in that: The function codes in the communication protocol are divided into: "read" function code, "set" function code, "wake up" function code, "alarm" function code, "IV curve scan" function code, "current detection" function code, and "arc detection" function code.

5. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 4, characterized in that: The "read" function code is divided into: 0x50 represents reading a single bit, 0x60 represents reading multiple bits, 0x51 represents reading a single word, and 0x61 represents reading multiple words.

6. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 4, characterized in that: The "setting" function code is divided into: 0x70 represents setting a single bit, 0x80 represents setting multiple bits, 0x71 represents setting a single word, and 0x81 represents setting multiple word.

7. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 3, characterized in that: The register address refers to the register address agreed to store the specified parameters or data. The parameters include: circuit breaker status, lightning arrester status, bus voltage warning value status, current warning value status, temperature warning status. The data includes: bus voltage, current value of each photovoltaic string, temperature value, humidity value, total current value, total power value, and total power generation value; The registers are divided into registers with bit or word as units according to different function codes. The number of registers refers to the number of stored data or parameter values. The number of occupied registers varies according to the different stored content values.

8. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 1, characterized in that: The high-speed power line carrier communication chip (4) module integrates a radio frequency communication module and supports dual-mode and single-mode communication protocol modes. In the dual-mode mode, the system parameters can be remotely configured or read through a matching wireless remote controller. The remote controller enters the setting mode, inputs the parameter value, the slave node device address and the power line number in the system parameter interface, and sends the setting instruction through a radio frequency signal. After receiving the instruction, the combiner box communication system parses the instruction and changes the local parameters. When it is necessary to read the system parameters of a certain node, the query object is directly selected in the remote controller interface and the read or query button is clicked. After the queried node receives the query instruction, the returned value is immediately sent to the remote controller for display through a wireless radio frequency signal.

9. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 2, characterized in that: The system supports two signal coupling modes, namely high-voltage direct coupling and magnetic ring coupling. The master and slave nodes can use the same coupling mode or different coupling modes. There are three combinations in total: ⑴ Both the master and slave nodes use high-voltage direct coupling, ⑵ Both the master and slave nodes use magnetic ring coupling, ⑶ One end uses high-voltage direct coupling and the other end uses magnetic ring coupling.

10. The combiner box communication system based on HPLC high-speed power line carrier communication as claimed in claim 2, characterized in that: When it is necessary to add an entire array of photovoltaic strings, the array is connected to the magnetic ring coupling interface reserved by the master node; when it is necessary to add a node to the existing array, a new slave node is connected in parallel to the existing slave node of the target line number. The new slave node can monitor the working conditions of other slave nodes in the array or domain control, and the new slave node device address is different from the existing slave node device address; when it is necessary to move the existing slave node to other arrays, it is only necessary to modify the corresponding line number of the slave node end or the master node end to the new line number, and a new communication network topology is formed.

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