CN115988003A - A Distributed Photovoltaic Data Mutual Transmission Complementary Transmission Method and System - Google Patents

Abstract

The invention relates to a distributed photovoltaic data mutual transmission and complement full transmission method, which comprises the following steps: s1: establishing data transmission connection for two of the plurality of distributed photovoltaic nodes based on the complementary transmission control field; s2: judging whether the data to be transmitted is received or not based on the complementary transmission control field, if not, transmitting the data between the two distributed photovoltaic nodes, and if so, ending the transmission; s3: and each distributed photovoltaic node and other distributed photovoltaic nodes complete data transmission according to the steps S1-S2. A distributed photovoltaic data mutual transmission and complementation complete transmission system is used for achieving a distributed photovoltaic data mutual transmission and complementation complete transmission method and comprises a main station layer, a communication layer and a terminal layer. The invention improves the transmission efficiency; the decentralized multi-node mutual transmission is realized, the reliability of data can be greatly improved, the occurrence probability that data cannot be transmitted due to the fact that transmission of individual equipment fails is greatly reduced, and the method is more economical and stable.

Description

A Distributed Photovoltaic Data Mutual Transmission Complementary Transmission Method and System

technical field

The invention relates to the field of photovoltaic data transmission, in particular to a distributed photovoltaic data mutual transmission complementary transmission method and system.

Background technique

The global energy shortage and environmental pollution are becoming more and more serious. As a clean energy that is safe and clean and has huge storage potential, people's utilization rate of solar energy is constantly improving. Among them, photovoltaic power generation is the most mainstream application method. Under the influence of my country's strategy, the development potential of distributed rooftop photovoltaic is huge. Unlike centralized photovoltaic power plants, distributed rooftop photovoltaics do not require additional land resources, have low economic costs, and are easy to install. Unlike centralized photovoltaic power plants, where operation and maintenance personnel can arrive at the site or monitor electrical parameters through unified equipment to detect possible faults, distributed rooftop photovoltaics usually rely on the monitoring of electrical parameters to detect faults. However, due to the small power generation of distributed rooftop photovoltaic cells and the scattered distribution locations, the quality requirements for data transmission are relatively high. The existing data transmission methods have certain limitations for the data transmission of rooftop photovoltaic electrical parameters, so improving the reliability and stability of distributed rooftop photovoltaic data transmission is of great significance for distributed rooftop photovoltaic power generation.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method and system for inter-complementary and complementary transmission of distributed photovoltaic data, improve the transmission efficiency, greatly improve the reliability of data, and greatly reduce the failure caused by the failure of individual equipment transmission. The probability of data failure to be transmitted is more economically stable.

The purpose of the present invention is achieved through the following technical solutions:

A distributed photovoltaic data mutual transmission complementary transmission method, comprising the following steps:

S1: Establish a data transmission connection for two of the multiple distributed photovoltaic nodes based on the mutual transmission completion control field;

S2: Determine whether the data to be transmitted has been received based on the mutual transmission completion control field. If not, perform data transmission between the two distributed photovoltaic nodes. If it has been received, end the transmission;

S3: Each distributed photovoltaic node completes data transmission with other distributed photovoltaic nodes according to steps S1-S2.

Further, the following steps are performed after step S3:

S4: Randomly select some distributed photovoltaic nodes to send data information to the relay gateway, and then the relay gateway uploads the data to the cloud platform.

Further, the data transmission connection is established through two handshakes and one hand wave.

Further, the intercommunication completion control field includes a flag bit layer, a sequence number layer, a sliding window layer and a data packet layer.

Further, the flag bit layer includes a connection status flag bit, a transmission status flag bit, a breakpoint and retransmission flag bit, a sending count flag bit, a reception confirmation flag bit, a time flag bit, a send/receive flag bit, and a transmission round completion flag bit.

Further, the format of the intercommunication completion control field is:

The first layer is the flag bit layer, and the 32 bits of the first layer are:

The flag bit T0 of the first character 1 bit indicates the connection status. When T0 is 0, there is no connection; T0 is the connection status flag bit;

The flag bit T1 of the second character 1 bit and the flag bit T2 of the third character 1 bit indicate the transmission status. When T0 is 1 and T1 is 0, it means that the transmission is in progress, and when T2 is 1, it means that the transmission is over; T1 and T2 are the transmission status flag;

The flag bit T3 of the 1st bit of the fourth character indicates the state of resuming transmission from breakpoints;

The fifth and sixth characters are 1-bit flags T4 and T5 respectively, indicating the breakpoint position. When T3 is 1, T4 and T5 record the breakpoint position;

The flag bit T6 of the 1st bit of the seventh character indicates the retransmission status, and the data is retransmitted when T6 is 1;

T3-T6 are breakpoint and retransmission flags;

The flag bit T7 of the eighth character 1 is used to indicate the number of times the current data is sent; T7 is the flag bit for the number of times sent;

The flag bit T8 of the 1st bit of the ninth character, if T8 is 1, it means that the receiver's confirmation is received;

The flag bit T9 of the tenth character 1, when T9 is 1, it means that the sending is completed but the receiver has not received confirmation; T8 and T9 are the receiving confirmation flags;

The eleventh and twelfth characters are respectively 1 flag bits T10, T11, which represent a time flag; T10 and T11 are time flag bits;

The flag bit T12 of the thirteenth character 1 bit, T12 is 1 is the sending end, and 0 is the receiving end; T12 is the sending/receiving flag bit;

The flag bit T13 of the fourteenth bit is 1, and T13 is 1 to indicate that a round of data transmission has been completed; T13 is the flag bit for the completion of the transmission round;

The remaining bits are reserved bits, indicating the user information that has received data;

The serial number layer includes the second layer and the third layer;

The second layer is a 36-bit serial number: mark the order of the electrical parameters and environmental parameter information of the sent data packet, mark the user included in the data, and the receiver compares with it to complete the data and update the flag;

The third layer is a 16-bit sequence number, which marks the sequence number of the data packet that needs to be retransmitted or resumed after the breakpoint;

The fourth layer is the sliding window layer, and the fourth layer is a 32-bit sliding window, which controls the sending and receiving of data according to the conversion of sending or receiving;

The fifth layer is the data packet layer, which sends all electrical parameters and environmental parameter data.

A distributed photovoltaic data mutual transmission complement transmission system is used to realize a distributed photovoltaic data mutual transmission supplementary transmission method, including a master station layer, a communication layer and a terminal layer.

Further, the terminal layer includes a data acquisition module, a data processing module, a data storage module and a data transmission module.

The beneficial effects of the present invention are:

By judging whether the data to be transmitted has been received, the amount of data transmission is reduced, data completion is realized, and transmission efficiency is improved; through two-two transmission between distributed photovoltaic nodes, decentralized multi-node mutual transmission is realized, which can be extremely Greatly improve the reliability of data, greatly reduce the probability of data transmission failure due to the failure of individual equipment transmission, and make it more economical and stable.

Description of drawings

Fig. 1 is the overall flowchart of the present invention;

Fig. 2 is a network structure diagram of the present invention;

Fig. 3 is a schematic diagram of the system of the present invention;

Fig. 4 is a schematic diagram of the control packet format of the present invention;

Fig. 5 is a schematic diagram of node transmission data completion in the present invention.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Embodiment one:

As shown in Figures 1 to 5, a distributed photovoltaic data mutual transmission complementary transmission method includes the following steps:

S1: Establish a data transmission connection for two of the multiple distributed photovoltaic nodes based on the mutual transmission completion control field;

The data transmission connection is established by two handshakes and one wave;

Take four distributed photovoltaic nodes ABCD as an example, A initiates a handshake to B, B initiates a wave to A, A is the sending end, B is the receiving end; check whether B is transmitting (that is, check the connection status flag of B bit), if idle, change the respective control flag bits and check the time, and then prepare for the connection to start transmission; A shakes hands with B again, at this time A and B establish a connection and start transmitting data;

S2: Determine whether the data to be transmitted has been received based on the mutual transmission completion control field. If not, perform data transmission between the two distributed photovoltaic nodes. If it has been received, end the transmission;

For example, after node A transmits to node B, B has the data of A and B, so after the transmission between B and C is completed, when A and C establish a connection to transmit data, they can complete the first layer flag bit of the control field by mutual transmission Information and the second-level serial number information know that the data information of A is duplicated, and you can choose to ignore the information of A and complete other information to speed up the efficiency of data transmission.

After the transmission starts, the system detects the received user information and records and changes the information of the first layer flag bit and the second layer serial number of the intertransmission completion control field, and sends and receives the confirmation data transmission through the fourth layer sliding window. After receiving, B sends a set of instructions to A to confirm the completion of the transmission, close the transmission channel with each other and prepare to start data transmission with other distributed photovoltaic nodes;

S3: Each distributed photovoltaic node completes data transmission with other distributed photovoltaic nodes according to steps S1-S2.

S4: Randomly select some distributed photovoltaic nodes to send data information to the relay gateway, and then the relay gateway uploads the data to the cloud platform.

After each distributed photovoltaic node of ABCD completes a data transmission process of sending and receiving with other distributed photovoltaic nodes, each distributed photovoltaic node has the data information of all distributed photovoltaic nodes. At this time, two distributed photovoltaic nodes are randomly selected. Photovoltaic nodes send data information to the relay gateway. Waiting for the data to be received, the relay gateway uploads the received two sets of data to the cloud platform, and the cloud platform receives the verification data to complete a complete transmission process.

By judging whether the data to be transmitted has been received, the amount of data transmission is reduced, data completion is realized, and transmission efficiency is improved; through two-two transmission between distributed photovoltaic nodes, decentralized multi-node mutual transmission is realized, which can be extremely Greatly improve the reliability of data, greatly reduce the probability of data transmission failure due to the failure of individual equipment transmission, and make it more economical and stable.

The mutual completion control field includes a flag bit layer, a sequence number layer, a sliding window layer and a data packet layer.

The flag bit layer includes a connection status flag, a transmission status flag, a breakpoint and retransmission flag, a sending times flag, a reception confirmation flag, a time flag, a send/receive flag, and a transmission round completion flag.

The format of the mutual completion control field is:

The first layer is the flag bit layer, and the 32 bits of the first layer are:

The flag bit T0 of the first character 1 bit indicates the connection status. When T0 is 0, there is no connection; T0 is the connection status flag bit;

The flag bit T1 of the second character 1 bit and the flag bit T2 of the third character 1 bit indicate the transmission status. When T0 is 1 and T1 is 0, it means that the transmission is in progress, and when T2 is 1, it means that the transmission is over; T1 and T2 are the transmission status flag;

The flag bit T3 of the 1st bit of the fourth character indicates the state of resuming transmission from breakpoints;

The fifth and sixth characters are 1-bit flags T4 and T5 respectively, indicating the breakpoint position. When T3 is 1, T4 and T5 record the breakpoint position;

The flag bit T6 of the 1st bit of the seventh character indicates the retransmission status, and the data is retransmitted when T6 is 1;

T3-T6 are breakpoint and retransmission flags;

The flag bit T7 of the eighth character 1 is used to indicate the number of times the current data is sent; T7 is the flag bit for the number of times sent;

The flag bit T8 of the 1st bit of the ninth character, if T8 is 1, it means that the receiver's confirmation is received;

The flag bit T9 of the tenth character 1, when T9 is 1, it means that the sending is completed but the receiver has not received confirmation; T8 and T9 are the receiving confirmation flags;

The eleventh and twelfth characters are respectively 1 flag bits T10, T11, which represent a time flag; T10 and T11 are time flag bits;

The flag bit T12 of the thirteenth character 1 bit, T12 is 1 is the sending end, and 0 is the receiving end; T12 is the sending/receiving flag bit;

The flag bit T13 of the fourteenth bit is 1, and T13 is 1 to indicate that a round of data transmission has been completed; T13 is the flag bit for the completion of the transmission round;

The remaining bits are reserved bits, indicating the user information that has received data;

The serial number layer includes the second layer and the third layer;

The second layer is a 36-bit serial number: mark the order of the electrical parameters and environmental parameter information of the sent data packet, mark the user included in the data, and the receiver compares with it to complete the data and update the flag;

The third layer is a 16-bit sequence number, which marks the sequence number of the data packet that needs to be retransmitted or resumed after the breakpoint;

The fourth layer is a sliding window layer, and the fourth layer is a 32-bit sliding window, which controls the sending and receiving of data according to the conversion of sending or receiving.

The fifth layer is the data packet layer, which sends all electrical parameters and environmental parameter data.

The format shown in Figure 4 is formed after the mutual transmission completion control field is added to the protocol header.

By setting up the mutual completion control field of the connection-oriented transmission protocol based on the data parameter message, the mutual completion of data transmission is realized. The new protocol header is a connection-oriented, message packet-based transmission protocol formed by adding some mutual transmission and completion control fields in the protocol header, forming a reliable transmission mechanism and improving data transmission efficiency.

In the reliable transmission mechanism, the transmission confirmation mechanism is used to confirm the transmission status, confirm the length of the received data, ensure the reliability of data transmission and save transmission time. Under this mechanism, the sender and the receiver will confirm that they are idle and successfully establish a connection. Data will start Transmission, compared with the stop waiting mechanism, saves the waiting time and improves the efficiency of transmission; adopts the data mutual transmission mechanism to reduce the probability of transmission failure due to problems in individual transmission processes, and further improves the reliability of data transmission. Mutual transmission of data to avoid the loss of individual data; adopt the data completion mechanism to save the number of sensors, reduce unnecessary data collection process, reduce the frequency of repeated transmission process, speed up the transmission efficiency and transmission reliability, and effectively reduce repeated information The collection reduces the possibility of error reporting due to data loss during node transmission, and effectively improves data reliability.

By adding a connection-oriented transmission protocol between the application layer and the transmission layer to complete the control field, a distributed photovoltaic data transmission protocol is established, and its security, reliability, and stability are guaranteed.

A distributed photovoltaic data mutual transmission complement transmission system is used to realize a distributed photovoltaic data mutual transmission supplementary transmission method, including a master station layer, a communication layer and a terminal layer.

The overall architecture of a distributed photovoltaic data mutual transmission complementary transmission system is divided into three layers from top to bottom, including the main station layer, communication layer and terminal layer.

Master station layer: It is composed of IoT cloud platform or upper computer, which has the functions of managing equipment, visualizing information, and data analysis.

Communication layer: composed of relay gateways, which process terminal data transmitted through lora communication, and then send it to the host computer through 4G communication, receive instructions from the host computer, and send them to the terminal after analysis.

Terminal layer: It is composed of terminal equipment, which processes, stores and transmits the data information of each node upwards, and executes the control instructions of the master station.

The terminal layer includes a data acquisition module, a data processing module, a data storage module and a data transmission module.

Data acquisition module: collect electrical data and meteorological data of photovoltaic modules.

Data processing module: analyze and process the acquired data according to the set parameters.

Data storage module: store the processed data information.

Data transmission module: transmit the processed data to the relay gateway through lora communication.

First, each terminal at the terminal layer creates an account, and each terminal collects the electrical data of the photovoltaic module and some meteorological data through the data collection module, and then analyzes and processes the acquired data through the data processing module to obtain the processed data, and then passes The data storage module stores, checks the transmission status, each user verifies the identity information, checks the stability of the channel, and establishes a transmission node. At the same time, each node transmits the processed data to each other through the method to complement each other and verify the integrity of the data. Each node stores all the data, and a random number of nodes is selected to transmit the data to the relay gateway through lora communication, and then the data collected and uploaded by the gateway is transmitted to the cloud platform server of the monitoring master station through 4G communication.

The workflow of a distributed photovoltaic data mutual transmission complementary transmission system includes: ① Create an account. ② Collect data. ③Transfer data. ④Complete the data. ⑤ Upload data.

Before data transmission, create an account at each terminal device, enter device information and location information, and sensors collect electrical parameter data and meteorological parameter data. Two nodes shake hands twice to establish a connection, confirm the sender and receiver, change their respective control flags and adjust the time, ignore repeated information transmission after starting transmission, and complete other information so that each node has all Node information. Randomly select two nodes to send data information to the relay gateway. Waiting for the data to be received, the relay gateway uploads the received two sets of data to the cloud platform, and the cloud platform receives the verification data to complete a complete transmission process.

The above-mentioned embodiments only express the specific implementation manner of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (8)

1. A distributed photovoltaic data mutual transmission complementary transmission method, characterized in that: comprising the following steps: S1: Establish a data transmission connection for two of the multiple distributed photovoltaic nodes based on the mutual transmission completion control field; S2: Determine whether the data to be transmitted has been received based on the mutual transmission completion control field. If not, perform data transmission between the two distributed photovoltaic nodes. If it has been received, end the transmission; S3: Each distributed photovoltaic node completes data transmission with other distributed photovoltaic nodes according to steps S1-S2. 2. A distributed photovoltaic data mutual transmission and complementary transmission method according to claim 1, characterized in that: After step S3, the following steps are performed: S4: Randomly select some distributed photovoltaic nodes to send data information to the relay gateway, and then the relay gateway uploads the data to the cloud platform. 3. A distributed photovoltaic data mutual transmission and complementary transmission method according to claim 1, characterized in that: The data transmission connection is established through two handshakes and one wave. 4. A distributed photovoltaic data mutual transmission and complementary transmission method according to claim 1, characterized in that: The mutual completion control field includes a flag bit layer, a sequence number layer, a sliding window layer and a data packet layer. 5. A distributed photovoltaic data mutual transmission and complementary transmission method according to claim 4, characterized in that: The flag bit layer includes a connection status flag, a transmission status flag, a breakpoint and retransmission flag, a sending times flag, a reception confirmation flag, a time flag, a send/receive flag, and a transmission round completion flag. 6. A distributed photovoltaic data mutual transmission and complementary transmission method according to claim 5, characterized in that: The format of the mutual completion control field is: The first layer is the flag bit layer, and the 32 bits of the first layer are: The flag bit T0 of the first character 1 bit indicates the connection status. When T0 is 0, there is no connection; T0 is the connection status flag bit; The flag bit T1 of the second character 1 bit and the flag bit T2 of the third character 1 bit indicate the transmission status. When T0 is 1 and T1 is 0, it means that the transmission is in progress, and when T2 is 1, it means that the transmission is over; T1 and T2 are the transmission status flag; The flag bit T3 of the 1st bit of the fourth character indicates the state of resuming transmission from breakpoints; The fifth and sixth characters are 1-bit flags T4 and T5 respectively, indicating the breakpoint position. When T3 is 1, T4 and T5 record the breakpoint position; The flag bit T6 of the 1st bit of the seventh character indicates the retransmission status, and the data is retransmitted when T6 is 1; T3-T6 are breakpoint and retransmission flags; The flag bit T7 of the eighth character 1 is used to indicate the number of times the current data is sent; T7 is the flag bit for the number of times sent; The flag bit T8 of the 1st bit of the ninth character, if T8 is 1, it means that the receiver's confirmation is received; The flag bit T9 of the tenth character 1, when T9 is 1, it means that the sending is completed but the receiver has not received confirmation; T8 and T9 are the receiving confirmation flags; The eleventh and twelfth characters are respectively 1 flag bits T10, T11, which represent a time flag; T10 and T11 are time flag bits; The flag bit T12 of the thirteenth character 1 bit, T12 is 1 is the sending end, and 0 is the receiving end; T12 is the sending/receiving flag bit; The flag bit T13 of the fourteenth bit is 1, and T13 is 1 to indicate that a round of data transmission has been completed; T13 is the flag bit for the completion of the transmission round; The remaining bits are reserved bits, indicating the user information that has received data; The serial number layer includes the second layer and the third layer; The second layer is a 36-bit serial number: mark the order of the electrical parameters and environmental parameter information of the sent data packet, mark the user included in the data, and the receiver compares with it to complete the data and update the flag; The third layer is a 16-bit sequence number, which marks the sequence number of the data packet that needs to be retransmitted or resumed after the breakpoint; The fourth layer is the sliding window layer, and the fourth layer is a 32-bit sliding window, which controls the sending and receiving of data according to the conversion of sending or receiving; The fifth layer is the data packet layer, which sends all electrical parameters and environmental parameter data. 7. A distributed photovoltaic data mutual transmission and complementary transmission system, which is used to realize a distributed photovoltaic data mutual transmission and complementary transmission method according to any one of claims 1-6, characterized in that it includes a main Station layer, communication layer and terminal layer. 8. A distributed photovoltaic data mutual transmission complementary transmission system according to claim 1, characterized in that: The terminal layer includes a data acquisition module, a data processing module, a data storage module and a data transmission module.

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