Photovoltaic inverter monitoring and metering device, system and method

Abstract

The invention provides a photovoltaic inverter monitoring and metering device, which is arranged on the side of a photovoltaic inverter, and comprises a communication module which comprises at least one input interface and at least two output interfaces, the input interface is connected with the photovoltaic inverter, and the at least two output interfaces are respectively connected with a first 4G module and a second 4G module, the first 4G module is in communication connection with a photovoltaic monitoring platform, and the second 4G interface is in communication connection with a photovoltaic metering platform; the control module is in communication connection with the communication module and is used for acquiring data of the photovoltaic inverter and reversely regulating and controlling the photovoltaic inverter; wherein the control module controls the at least one input interface to perform single-line or parallel communication with the at least two output interfaces; and the power supply module is arranged at the input interface end, is connected with the communication module, the control module and the storage module, and is used for voltage conversion and power supply.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic grid-connected inverter monitoring and metering, and in particular to a photovoltaic inverter monitoring and metering device, system and monitoring and metering method. Background Art

[0002] Photovoltaic power generation systems are mostly grid-connected systems, which are composed of photovoltaic cells and photovoltaic grid-connected inverters. As one of the core components, the photovoltaic grid-connected inverter converts the DC power output by the photovoltaic cells into AC power that meets the requirements of the power grid, and then inputs it into the power grid. The photovoltaic grid-connected inverter is connected to the power grid, and the power quality of the AC signal at its output end will directly affect the safe operation of the power grid. The performance of the photovoltaic grid-connected inverter determines the operation status and service life of the entire photovoltaic grid-connected system.

[0003] Therefore, it is necessary to study and design a photovoltaic grid-connected inverter status monitoring system to monitor the output AC signal and its power quality, and provide a powerful technical platform for the stable operation of photovoltaic power stations. Summary of the invention

[0004] In view of this, the purpose of the present application is to propose a method to overcome the above problems or at least partially solve the above problems.

[0005] Based on the above purpose, the first aspect provided by the present application provides a photovoltaic inverter monitoring and metering device, which is arranged on the photovoltaic inverter side, and the device includes:

[0006] A communication module, comprising at least one input interface and at least two output interfaces, wherein the input interface is connected to a photovoltaic inverter, and the at least two output interfaces are respectively connected to a first 4G module and a second 4G interface, wherein the first 4G module is communicatively connected to a photovoltaic monitoring platform, and the second 4G interface is communicatively connected to a photovoltaic metering platform;

[0007] A control module, which is in communication connection with the communication module, and is used to collect data of the photovoltaic inverter and reversely regulate the photovoltaic inverter; wherein the control module controls the at least one input interface to communicate with the at least two output interfaces in a single line or in parallel;

[0008] The power supply module is arranged at the input interface end and is respectively connected to the communication module, the control module and the storage module for performing voltage conversion and supplying power.

[0009] Optionally, it further includes a storage module and an encryption module, wherein the storage module is connected to the control module and the power module respectively and is used to store data of the photovoltaic inverter;

[0010] The encryption module is connected to the control module and the power module respectively, and is used to encrypt the data of the photovoltaic inverter, and to perform identity authentication between the photovoltaic monitoring platform and the first 4G module and between the photovoltaic metering platform and the second 4G module.

[0011] Optionally, the power module includes a first branch and a second branch, the first branch isolates the first voltage input by the photovoltaic inverter, and inputs the isolated first voltage into the circuit voltage side of the input interface and the output interface;

[0012] The second branch is used to convert the first voltage into a second voltage, and the second voltage is used to power the communication module and the control module, and is input into the working voltage side of the input interface and the output interface.

[0013] Optionally, the first branch includes an isolation module, which includes a first capacitor, a second capacitor, a field effect transistor and a resistor, the drain of the field effect transistor is connected to the output end of the first capacitor, the source of the field effect transistor is connected to the input end of the second capacitor, and the output end of the second capacitor is connected to the resistor.

[0014] Optionally, the input interface and the output interface are RS485 interfaces.

[0015] Optionally, the RS485 interface includes:

[0016] An interface chip, the interface chip comprising an RXD interface, a TXD interface, a first digital circuit and a second digital circuit, the interface chip being connected to the control module via the RXD interface and the TXD interface to perform data transmission of the photovoltaic inverter and transmission of reverse control instructions of the photovoltaic inverter;

[0017] A first digital interface, a first inductor is connected between the first digital circuit and the first digital interface, and a first resistor is connected in parallel with the first inductor;

[0018] A second digital interface, a second inductor is connected between the second digital circuit and the second digital interface, a second resistor is provided in parallel with the second inductor, and one end of the second resistor close to the second interface is grounded.

[0019] Optionally, the power module is connected to the first 4G module and the second 4G module respectively through the first branch, so as to supply power to the first 4G module and the second 4G module.

[0020] Optionally, the first 4G module and the second 4G module are respectively hot-pluggably connected to at least two of the output interfaces;

[0021] The input interface is hot-swappable connected to the photovoltaic inverter.

[0022] A second aspect of the present application provides a photovoltaic power station data monitoring and metering system, including the photovoltaic inverter monitoring and metering device as described in the first aspect;

[0023] A photovoltaic monitoring platform, which communicates with the first 4G module of the photovoltaic inverter monitoring and metering device, and is used to monitor and summarize the operating parameters of the photovoltaic inverter, and issue reverse control instructions based on the summary results;

[0024] A photovoltaic metering platform, which communicates data with the second 4G module of the photovoltaic inverter monitoring and metering device, and is used to monitor and store the electric energy parameters of the photovoltaic inverter.

[0025] A third aspect of the present application provides a photovoltaic power station data monitoring and metering method, which is applied to the photovoltaic power station data monitoring and metering system according to the second aspect, and the method includes:

[0026] Using the control module to collect the operating parameters of the photovoltaic inverter through the input interface, and sending them to the photovoltaic monitoring platform through the first 4G module of the output interface for aggregation, and issuing reverse control instructions according to the aggregation results;

[0027] The control module is used to collect the electric energy parameters of the photovoltaic inverter through the input interface and send them to the photovoltaic metering platform for storage through the second 4G module of the output interface.

[0028] As can be seen from the above, the photovoltaic inverter monitoring and metering device, system and monitoring and metering method provided by the present application utilize the photovoltaic inverter monitoring and metering device to adapt the photovoltaic inverter to have only one northbound communication interface for collecting operating parameters, while realizing the collection of electric energy parameters on the photovoltaic inverter side at the same time. Further, there is no need to connect an external collection device to the photovoltaic inverter grid-connected point, avoiding the need for an external collection device at the photovoltaic inverter grid-connected point, avoiding the problem of inconvenient installation, difficult installation, and the need for power outages or live operations. The 4G communication method of the second 4G module is used to meet the communication needs while improving the network transmission rate and response speed, and expanding the capacity and link coverage of the entire photovoltaic inverter monitoring and metering system. It avoids the need to lay optical cables for wired communication, which is too costly, as well as the problem of unstable GPRS and Wi-Fi wireless communications and small coverage.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of a photovoltaic inverter monitoring and metering device 100 according to an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a power supply scheme for a power module according to an embodiment of the present application;

[0033] Figure 3a This is a schematic diagram of the first branch principle of an embodiment of the present application;

[0034] Figure 3b This is a schematic diagram of the principle of the second branch of the embodiment of the present application;

[0035] Figure 4 A schematic diagram of the input interface and output interface circuit principles of an embodiment of the present application;

[0036] Figure 5 This is a schematic diagram of the encryption module principle of an embodiment of the present application;

[0037] Figure 6 A schematic diagram of a software solution based on the MQTT message bus according to an embodiment of the present application;

[0038] Figure 7 A schematic diagram of a photovoltaic inverter monitoring and metering system 200 according to an embodiment of the present application;

[0039] Figure 8 This is a flow chart of a photovoltaic power station data monitoring and metering method according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0041] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In order to realize the status monitoring of photovoltaic inverters, it is necessary to collect the data of the inverters in real time. However, different data requires different processing platforms to process. The inverter has only one communication interface to the north. In the related technology, the photovoltaic monitoring platform uses GPRS or Wi-Fi wireless communication to connect to the communication interface of the inverter to read the inverter data, and then upload the operating parameters of the inverter by GPRS or Wi-Fi wireless communication, so as to realize the centralized real-time monitoring of the scattered photovoltaic power stations, store the data of each photovoltaic power station, and centrally manage the data after analysis and processing, so as to provide data services for the photovoltaic monitoring platform and provide data support for intelligent power dispatching.

[0043] As for the collection of electric energy parameters, since the inverter has only one northbound communication interface, the relevant technology installs an external collection device capable of collecting electric energy parameters at the grid connection point of the inverter, such as a sensor, a power generation meter, a power receiving meter, a power quality monitoring device, etc. The electric energy parameters are collected using an external collection device, and then the electric energy parameters collected from the site are transmitted to the terminal device through a carrier / wireless / carrier wireless dual-mode communication method. The terminal device summarizes the converted electric energy parameters and transmits them to the photovoltaic metering cloud platform. The photovoltaic metering cloud platform stores, views and displays the real-time and historical operating data of each photovoltaic power station and all equipment in the power station, and uses the interactive interface of the platform to realize functions such as analysis and management of electric energy parameters.

[0044] However, for the collection of electric energy parameters, the grid-connected point of the inverter uses an external collection device and a terminal device to achieve two-way communication using wired or GPRS, Wi-Fi wireless communication. Wired communication methods include RS485 bus, CAN bus, fiber optic communication and power line PLC communication. Although RS485 and light have reliable physical connections, they both require laying cables and manual maintenance, which has high operating costs. When problems occur, they need to be checked bit by bit, which also requires a high time cost. Power line PLC communication uses power lines as the transmission medium of carrier signals and does not require additional cables, but is easily interfered by external signals. Among wireless communication methods, GPRS technology is limited by low transmission rates and there is a risk of network withdrawal. Wi-Fi access requires the participation of mobile hotspots. Deploying a Wi-Fi network covering the entire photovoltaic power station requires high costs and it is difficult to ensure the reliability of the signal.

[0045] In addition, sensors, power generation meters, power receiving meters, power quality monitoring devices, etc. are all load devices. Their installation requires power outage, which is inconvenient. They need to draw electricity from the grid during operation, which will bring additional operating costs.

[0046] Therefore, the present application provides a photovoltaic inverter monitoring and metering device, the purpose of which is to simultaneously realize real-time monitoring of the photovoltaic inverter and the collection of operating parameters and electric energy parameters of the photovoltaic inverter when the inverter has only one communication interface. While completing the collection of electric energy parameters, the transmission rate and operation of the electric energy parameters are further improved, and the operation cost of the power grid is reduced.

[0047] refer to Figure 1 As shown, an embodiment of the present application provides a photovoltaic inverter monitoring and metering device, which is arranged on the photovoltaic inverter side, and the device includes:

[0048] The communication module includes at least one input interface and at least two output interfaces, the input interface is connected to the photovoltaic inverter, and the at least two output interfaces are respectively connected to the first 4G module and the second 4G module, the first 4G module is communicatively connected to the photovoltaic monitoring platform, and the second 4G interface is communicatively connected to the photovoltaic metering platform.

[0049] At least one input interface is connected to the only northbound communication interface of the photovoltaic inverter to achieve connection with the photovoltaic inverter, one output interface is connected to the first 4G module, and communication connection with the photovoltaic monitoring platform is achieved through the 4G communication method of the first 4G module, and another output interface is connected to the second 4G module, and communication connection with the photovoltaic metering platform is achieved through the 4G communication method of the second 4G module.

[0050] Among them, the second output interface and the second 4G module are used to collect the power parameters of the photovoltaic inverter. Furthermore, there is no need to connect an external collection device to the grid connection point of the photovoltaic inverter, which avoids the inconvenience and difficulty of installation and the need for power outages or live operations. Furthermore, the 4G communication method of the second 4G module not only meets the communication requirements, but also improves the network transmission rate and response speed, and expands the capacity and link coverage of the entire photovoltaic inverter monitoring and metering system. Avoid the cost problem of wired communication and the problem of unstable wireless communication in related technologies.

[0051] It also includes a control module, which is connected to the communication module for collecting data of the photovoltaic inverter and reversely regulating the photovoltaic inverter; the control module controls the at least one input interface to communicate with at least two output interfaces in a single line or in parallel. A power module is arranged at the input interface end, and is respectively connected to the communication module, the control module and the storage module for voltage conversion and power supply.

[0052] In this embodiment, the data of the photovoltaic inverter includes the operating parameters and power parameters of the photovoltaic inverter, wherein the operating parameters include the status parameters of the photovoltaic strings, the combiner box and the photovoltaic inverter itself, and the power parameters include the power, voltage, current, active power and power factor of the photovoltaic power station.

[0053] As the control core of the photovoltaic inverter monitoring and metering device, the control module also controls the operation of the entire photovoltaic inverter monitoring and metering device. By controlling the input interface and the output interface to communicate in single or parallel, the operation parameters or the electric energy parameters can be collected separately, or the operation parameters and the electric energy parameters can be collected simultaneously. The power module needs to provide the working voltage for the communication module and the control module, and also needs to provide the circuit voltage for the photovoltaic inverter monitoring and metering device.

[0054] In some embodiments, a storage module and an encryption module are also included. The storage module is connected to the control module and the power module respectively, and is used to store the data of the photovoltaic inverter. The encryption module is connected to the control module and the power module respectively, and is used to encrypt the data of the photovoltaic inverter, and to authenticate the identity between the photovoltaic monitoring platform and the first 4G module and the identity between the photovoltaic metering platform and the second 4G module. After authentication, the first 4G module only communicates bidirectionally with the authenticated photovoltaic monitoring platform, and the second 4G module only communicates bidirectionally with the authenticated photovoltaic metering platform to prevent information leakage.

[0055] The function of the storage module is to store the collected operating parameters and electric energy parameters. Figure 5 As shown, the encryption module performs security operations such as encryption, decryption, and authentication on the collected operating parameters and electric energy parameters. The power module further provides working voltage to the storage module and the encryption module.

[0056] In some embodiments, reference Figure 2 As shown, the power module includes a first branch and a second branch. The first branch isolates the first voltage input by the photovoltaic inverter and inputs the isolated first voltage into the circuit voltage side of the input interface and the output interface. The second branch is used to convert the first voltage into a second voltage, and the second voltage is used to power the communication module and the control module, and is input into the working voltage side of the input interface and the output interface.

[0057] In some exemplary embodiments, the first voltage is 5V and the second voltage is 3.3V. The communication is external and is easily interfered by interference signals, thereby interfering with the photovoltaic inverter monitoring and metering device, further interfering with the collected data of the photovoltaic inverter, and failing to achieve real-time monitoring of the photovoltaic power station. By isolating the first voltage, interference is eliminated, and a stable circuit voltage is provided for the input interface and the output interface.

[0058] Exemplary, reference Figure 3a and Figure 3b As shown, Figure 3a A schematic diagram of the first branch is shown in FIG. Figure 3b A schematic diagram of the second branch is shown.

[0059] In some embodiments, the first branch includes an isolation module, which includes a first capacitor, a second capacitor, a field effect transistor and a resistor, the drain of the field effect transistor is connected to the output end of the first capacitor, the source of the field effect transistor is connected to the input end of the second capacitor, and the output end of the second capacitor is connected to the resistor.

[0060] When Vin (5V) is applied, the first capacitor C1 is charged to the input voltage. The charged first capacitor C1 is then discharged to the second capacitor C2 through the field effect transistor Q1 (n-channel MOSFET). The voltage on C2 is then divided by the resistor R1 to obtain the output voltage Vout. The output voltage Vout is the isolated voltage and is also 5V. C1 and C2 provide isolation between the input and output, while Q1 acts as a switch to control the charge flow between the two capacitors.

[0061] In some embodiments, the input interface and the output interface are RS485 interfaces. The physical form of the northbound communication interface of the inverters of different manufacturers is different, and 90% of the inverter interfaces of photovoltaic power stations are RS485 interfaces. This application will use the RS485 interface as the input interface, which is more universal. In addition, the output interface is an RS485 interface, which is the same as the input interface mode, reducing the difficulty of the manufacturing process and saving costs.

[0062] In some embodiments, reference Figure 4As shown, the RS485 module includes an interface chip, the interface chip includes an RXD interface, a TXD interface, a first digital circuit (A) and a second digital circuit (B), and the interface chip is connected to the control module through the RXD interface and the TXD interface to perform data transmission of the photovoltaic inverter and transmission of reverse control instructions of the photovoltaic inverter;

[0063] A first digital interface, a first inductor is connected between the first digital circuit and the first digital interface, and a first resistor is connected in parallel with the first inductor;

[0064] A second digital interface, a second inductor is connected between the second digital circuit and the second digital interface, a second inductor is provided in parallel with a second resistor, and one end of the second resistor close to the second interface is grounded, wherein the first inductor and the second inductor have the same specifications, and the first resistor and the second resistor have the same specifications.

[0065] In the wired communication between the photovoltaic inverter monitoring and metering device and the photovoltaic inverter in the embodiment of the present application, the control module communicates with the interface chip through the RXD interface and the TXD interface, and the first digital interface (485_A) and the second digital interface (485_B) are connected to the photovoltaic inverter to realize communication with the photovoltaic inverter. In the communication between the photovoltaic inverter monitoring and metering device and the first 4G module and the second 4G module, the control module also communicates with the interface chip through the RXD interface and the TXD interface, and the 485_A and 485_B in the two output interfaces are respectively connected to the first 4G module and the second 4G module to realize communication.

[0066] In some embodiments, the control module includes a protocol conversion module for converting the communication protocol of the photovoltaic inverter into a preset communication protocol. The control module is used to perform protocol conversion on the northbound communication interface of inverters from different manufacturers, thereby realizing data collection and direction control of the photovoltaic inverter.

[0067] In some embodiments, the power module is connected to the first 4G module and the second 4G module respectively through the first branch, and is used to supply power to the first 4G module and the second 4G module. The first branch uses the isolated first voltage to provide circuit voltage to the input interface and the output interface, and also supplies power to the first 4G module and the second 4G module. The second 4G module uses 4G wireless communication to communicate with the photovoltaic metering platform, which is convenient to install compared to the traditional external collection device at the grid connection point of the photovoltaic inverter. There is no need for power outage or live operation, which saves the high power demand of the external collection equipment, and at the same time has high transmission rate and good stability.

[0068] In some embodiments, the first 4G module and the second 4G module are hot-plugged with at least two output interfaces respectively; the input interface is hot-plugged with the photovoltaic inverter. Through the above embodiments, compared with wired communication, the 4G wireless communication method does not need to lay cables and invest in manual maintenance, is not easily interfered by external signals, and reduces costs overall. Compared with GPRS and Wi-Fi wireless communications, the network transmission rate and response speed are faster, the cost of covering the entire photovoltaic power station is lower, and the signal reliability is higher. On this basis, in order to avoid higher maintenance costs, the first 4G module and the second 4G module are hot-plugged with the output interface. When the 4G module is damaged or the signal is unstable, it can be directly replaced, which is simple to operate and further reduces the cost of manual maintenance. Further, when the photovoltaic inverter monitoring and metering device cannot communicate between the input interface end and the photovoltaic inverter, or cannot communicate with the first 4G module or the second 4G module at the output interface end, it is judged that the photovoltaic inverter monitoring and metering device is damaged, it is directly replaced by using the hot-plug connection between the input interface and the photovoltaic inverter, which can also be directly replaced, which is simple to operate and further reduces the cost of manual maintenance.

[0069] Based on the same inventive concept, Figure 7 As shown, the present application provides a photovoltaic power station data monitoring and metering system, including a photovoltaic inverter monitoring and metering device of any of the above embodiments;

[0070] Photovoltaic monitoring platform, the first 4G module data communication between the photovoltaic monitoring platform and the photovoltaic inverter monitoring and metering device is used to monitor and summarize the operating parameters of the photovoltaic inverter, and issue reverse control instructions based on the summary results.

[0071] The photovoltaic metering platform communicates data with the second 4G module of the photovoltaic inverter monitoring and metering device, and is used to monitor and store the electric energy parameters of the photovoltaic inverter.

[0072] In some embodiments, the photovoltaic monitoring platform includes a first cloud platform. The operating parameters collected by the photovoltaic inverter monitoring and metering device from the photovoltaic inverter are transmitted to the first cloud platform through the first 4G module. The first cloud platform provides data support for the intelligent scheduling of the photovoltaic power station through real-time monitoring and summary of the operating parameters. For example, if the power load in the operating parameters is too high, the power scheduling is improved.

[0073] The photovoltaic metering platform includes a fusion terminal and a second cloud platform. The photovoltaic inverter monitoring and metering device transmits the electric energy parameters collected from the photovoltaic inverter to the fusion terminal through the second 4G module. The fusion terminal summarizes the electric energy parameters and uploads them to the second cloud platform. The second cloud platform stores, views and displays the real-time and historical electric energy data of each photovoltaic power station and all equipment in the power station.

[0074] In some optional embodiments, the second cloud platform includes an interactive interface, which is used to analyze and manage different power parameters.

[0075] In some optional embodiments, the photovoltaic power station data monitoring and metering system of the present application implements different application software designs based on the MQTT message bus, referring to Figure 6 As shown, the software includes photovoltaic inverter collection, fusion terminal interaction, 4G module (first 4G module and second 4G module) data forwarding, fusion terminal collection, 4G management, data storage, edge computing and security management applications. The functions of each application and process are briefly described as follows:

[0076] Photovoltaic inverter collection application: According to the application layer transmission protocol of the northbound interface of the photovoltaic inverter, according to the subject of the interactive application of the fusion terminal or the data forwarding and publishing of the first 4G module, the data of the photovoltaic inverter is collected periodically, and the collected data is sent to the fusion terminal, the first 4G module according to the source, or periodically reported to the fusion terminal or the first 4G module.

[0077] Fusion terminal interactive application: Use MQTT protocol to establish a long connection with the fusion terminal, interact with the 4G management application when the connection is abnormal, complete the network reconstruction, and actively report the collected data to the fusion terminal according to the fusion terminal instructions or periodically. It can be understood that the 4G management application mainly manages the 4G wireless network.

[0078] The first 4G module data forwarding application: according to the photovoltaic inverter transmission protocol, the collected data or instructions are sent to the photovoltaic inverter collection application, or the data collected by the photovoltaic inverter is forwarded to the first 4G module data forwarding application.

[0079] Converged terminal collection application: According to the architecture of the converged terminal, a server application is developed to receive the connection request of the second 4G module for protocol and interface conversion as the server, and send the converged terminal collection instructions and control instructions to the second 4G module according to the model, and receive the data periodically reported by the second 4G module. At the same time, the data reported by the second 4G module is stored in the data center in a model. If the converged terminal has a control APP, the subject of the control APP is received and sent to the corresponding second 4G module.

[0080] 4G management application: It is necessary to register the 4G network and manage the connection and network status.

[0081] Data storage application: store inverter operating parameters and power parameters separately, including grid status data, photovoltaic cell module status data, energy storage battery status data, inverter working status data, error and fault information, and photovoltaic power generation power prediction data.

[0082] Edge computing applications: Analyze and process the collected data from photovoltaic inverters to form control or early warning reports;

[0083] Security management application: Since the second 4G module interacts with the converged terminal, in order to prevent information leakage, it is necessary to encrypt and decrypt the communication data and authenticate the identity of the access converged terminal.

[0084] Based on the same inventive concept, Figure 8 As shown, the present application provides a photovoltaic power station data monitoring and metering method, including:

[0085] S10, using the control module to collect the operating parameters of the photovoltaic inverter through the input interface and send them to the photovoltaic monitoring platform through the first 4G module of the output interface for aggregation, and issuing reverse control instructions according to the aggregation results;

[0086] S20, using the control module to collect the electric energy parameters of the photovoltaic inverter through the input interface and sending them to the photovoltaic metering platform through the second 4G module of the output interface for storage.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0088] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0089] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0090] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A photovoltaic inverter monitoring and metering device, characterized in that: Set on the photovoltaic inverter side, the device includes: A communication module, comprising at least one input interface and at least two output interfaces, wherein the input interface is connected to a photovoltaic inverter, and the at least two output interfaces are respectively connected to a first 4G module and a second 4G interface, wherein the first 4G module is communicatively connected to a photovoltaic monitoring platform, and the second 4G interface is communicatively connected to a photovoltaic metering platform; A control module, which is in communication connection with the communication module, and is used to collect data of the photovoltaic inverter and reversely regulate the photovoltaic inverter; wherein the control module controls the at least one input interface to communicate with the at least two output interfaces in a single line or in parallel; The power supply module is arranged at the input interface end and is respectively connected to the communication module, the control module and the storage module for performing voltage conversion and supplying power.

2. The photovoltaic inverter monitoring and metering device according to claim 1, characterized in that: It also includes a storage module and an encryption module, wherein the storage module is connected to the control module and the power module respectively and is used to store data of the photovoltaic inverter; The encryption module is connected to the control module and the power module respectively, and is used to encrypt the data of the photovoltaic inverter, and to perform identity authentication between the photovoltaic monitoring platform and the first 4G module and between the photovoltaic metering platform and the second 4G module.

3. The photovoltaic inverter monitoring and metering device according to claim 1, characterized in that: The power module comprises a first branch and a second branch, the first branch isolating a first voltage input by the photovoltaic inverter, and inputting the isolated first voltage into the circuit voltage side of the input interface and the output interface; The second branch is used to convert the first voltage into a second voltage, and the second voltage is used to power the communication module and the control module, and is input into the working voltage side of the input interface and the output interface.

4. The photovoltaic inverter monitoring and metering device according to claim 3, characterized in that: The first branch includes an isolation module, which includes a first capacitor, a second capacitor, a field effect transistor and a resistor, the drain of the field effect transistor is connected to the output end of the first capacitor, the source of the field effect transistor is connected to the input end of the second capacitor, and the output end of the second capacitor is connected to the resistor.

5. The photovoltaic inverter monitoring and metering device according to claim 1, characterized in that: The input interface and the output interface are RS485 interfaces.

6. The photovoltaic inverter monitoring and metering device according to claim 5, characterized in that: The RS485 interface includes: An interface chip, the interface chip comprising an RXD interface, a TXD interface, a first digital circuit and a second digital circuit, the interface chip being connected to the control module via the RXD interface and the TXD interface to perform data transmission of the photovoltaic inverter and transmission of reverse control instructions of the photovoltaic inverter; A first digital interface, a first inductor is connected between the first digital circuit and the first digital interface, and a first resistor is connected in parallel with the first inductor; A second digital interface, a second inductor is connected between the second digital circuit and the second digital interface, a second resistor is provided in parallel with the second inductor, and one end of the second resistor close to the second interface is grounded.

7. The photovoltaic inverter monitoring and metering device according to claim 3, characterized in that: The power module is connected to the first 4G module and the second 4G module respectively through the first branch, and is used to supply power to the first 4G module and the second 4G module.

8. The photovoltaic inverter monitoring and metering device according to claim 1, characterized in that: The first 4G module and the second 4G module are respectively hot-pluggably connected to at least two of the output interfaces; The input interface is hot-swappable connected to the photovoltaic inverter.

9. A photovoltaic power station data monitoring and metering system, characterized in that: A photovoltaic inverter monitoring and metering device comprising any one of claims 1 to 8; A photovoltaic monitoring platform, which communicates with the first 4G module of the photovoltaic inverter monitoring and metering device, and is used to monitor and summarize the operating parameters of the photovoltaic inverter, and issue reverse control instructions based on the summary results; A photovoltaic metering platform, which communicates data with the second 4G module of the photovoltaic inverter monitoring and metering device, and is used to monitor and store the electric energy parameters of the photovoltaic inverter.

10. A photovoltaic power station data monitoring and metering method, characterized in that: Applied to the photovoltaic power station data monitoring and metering system according to claim 9, the method comprises: Using the control module to collect the operating parameters of the photovoltaic inverter through the input interface, and sending them to the photovoltaic monitoring platform through the first 4G module of the output interface for aggregation, and issuing reverse control instructions according to the aggregation results; The control module is used to collect the electric energy parameters of the photovoltaic inverter through the input interface and send them to the photovoltaic metering platform for storage through the second 4G module of the output interface.

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