Low-voltage distributed photovoltaic grid-connected device and control method

Abstract

The invention relates to the technical field of distributed photovoltaic, in particular to a low-voltage distributed photovoltaic grid-connected device and a control method, and the device comprises a distributed photovoltaic grid-connected device, a photovoltaic inverter and a power distribution network; the distributed photovoltaic monitoring control device comprises a protocol conversion unit and a central control unit, the protocol conversion unit is respectively connected with the photovoltaic inverter and the central control unit, and the central control unit is connected with the distribution automation edge device; the distributed photovoltaic monitoring control device is arranged, the protocol conversion unit recognizes and collects the running state of distributed photovoltaic through the photovoltaic inverter, the recognized and collected data are analyzed by the central control unit and then uploaded to the power distribution network, a power grid enterprise can monitor, control and the like on the distributed photovoltaic in an internal network, and meanwhile, the distributed photovoltaic monitoring control device has the advantages of being simple in structure, convenient to operate and high in practicability. And the power distribution network can issue a control instruction to perform scheduling control on the distributed photovoltaic system, so that the effect of monitoring and controlling the running state of the distributed photovoltaic system in the distributed photovoltaic grid-connected device is realized.

Description

Technical Field

[0001] The present invention relates to the field of distributed photovoltaic technology, and in particular to a low-voltage distributed photovoltaic grid-connected device and a control method. Background Art

[0002] With the large-scale access of low-voltage distributed photovoltaics, the distribution network is gradually transforming from a power network that simply receives and distributes electricity to users to a power network with coordinated interaction between source, grid, load and storage. It is crucial to accurately monitor and control the operating status of low-voltage distributed photovoltaics.

[0003] At present, the construction of intelligent fusion terminals is being vigorously carried out in the construction and transformation of domestic distribution substations, and the distribution substations are being made "observable, measurable, adjustable and controllable" based on intelligent fusion terminals. At this stage, low-voltage distributed photovoltaics mainly transmit the collected distributed photovoltaic operation data to the external network system built by each manufacturer through photovoltaic inverters to realize the monitoring of low-voltage distributed photovoltaics. Grid companies cannot realize the monitoring of distributed photovoltaics through photovoltaic inverters; in terms of dispatching and control, most low-voltage distributed photovoltaics do not support direct grid regulation after being connected to the distribution network. At the same time, due to the differences in communication ports and communication protocols of photovoltaic inverters from different manufacturers, it is difficult to carry out the direct procurement and control mode of low-voltage distributed photovoltaics based on intelligent fusion terminals. As a result, the grid companies are in a state of blind monitoring, blind control and blind management of distributed photovoltaic operation management, which is not conducive to the orderly development of low-voltage distributed photovoltaics and cannot meet the needs of coordinated dispatching and operation management of distribution network sources, grids, loads and storage under the new situation.

[0004] Therefore, it is necessary to realize the integration and standardization of distributed photovoltaic information collection, control, metering and other functions through various new technologies and methods, reduce investment costs and improve the level of information transparency, and promote the construction of new distribution networks. Summary of the invention

[0005] The present invention provides a low-voltage distributed photovoltaic grid-connected device and a control method, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing low-voltage distributed photovoltaic grid-connected device cannot monitor the operating status of the distributed photovoltaic.

[0006] To solve the above problems, one of the technical solutions of the present invention is achieved in the following way: a low-voltage distributed photovoltaic grid-connected device, including a distributed photovoltaic grid-connected device, a photovoltaic inverter and a distribution network; the distribution network includes a distribution automation edge device, a marketing electricity information collection system and a distribution automation master station, and the marketing electricity information collection system and the distribution automation master station are both connected to the distribution automation edge device; the distributed photovoltaic grid-connected device includes a box and a distributed photovoltaic monitoring and control device installed in the box, the distributed photovoltaic monitoring and control device includes a protocol conversion unit and a central control unit, the protocol conversion unit is respectively connected to the photovoltaic inverter and the central control unit, and the central control unit The element is connected to the distribution automation edge device; the distributed photovoltaic monitoring and control device is connected to the photovoltaic inverter and the distribution network. The protocol conversion unit of the distributed photovoltaic monitoring and control device identifies and collects the operating status of the distributed photovoltaic via the photovoltaic inverter, and the identified and collected data is parsed by the central control unit and uploaded to the distribution network. The data is output to the distribution automation master station and the marketing electricity information collection system through the distribution automation edge device of the distribution network. The power grid company can monitor and control the distributed photovoltaic on the intranet, and the distribution network can issue control instructions to the distributed photovoltaic monitoring and control device. The distributed photovoltaic monitoring and control device realizes the dispatching control of the distributed photovoltaic via the photovoltaic inverter.

[0007] The above-mentioned protocol conversion unit includes a protocol conversion module, a data acquisition module, a protocol identification module and a communication switching module. The communication switching module is connected to the photovoltaic inverter. The communication switching module, the protocol identification module, the data acquisition module and the protocol conversion module are connected in sequence. The protocol conversion module is connected to the central control unit.

[0008] A mounting plate is provided on the inside of the box, on which a mutual inductor, a grounding copper busbar and a metering unit are respectively mounted, and the metering unit includes a meter and a meter connector; the mutual inductor is respectively connected to the distribution network and the isolation switch, the isolation switch is connected to the distributed photovoltaic monitoring and control device, the meter, the meter connector and the distributed photovoltaic monitoring and control device are connected in sequence, the meter is connected to the distribution network, and the grounding copper busbar is grounded.

[0009] The above-mentioned distributed photovoltaic monitoring and control device also includes a remote communication unit, a data storage unit and a human-computer interaction unit. The data storage unit and the human-computer interaction unit are both connected to the central control unit, and the remote communication unit is respectively connected to the central control unit and the distribution automation edge device; it also includes a power supply unit, which is connected to the distributed photovoltaic monitoring and control device.

[0010] The second technical solution of the present invention is achieved by the following method: a low-voltage distributed photovoltaic grid-connected control method, comprising the following steps: Photovoltaic inverters collect distributed photovoltaic operation data; The protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data with unified protocol; The central control unit receives data in a unified protocol, summarizes and analyzes the data, and outputs it in the form of power line carrier / micropower; The distribution automation edge device receives data output in the form of power line carrier / micropower and uploads it to the marketing power consumption information collection system and the distribution automation master station; The marketing electricity information collection system and the distribution automation master station issue dispatching control instructions to the distribution automation edge device based on the distributed photovoltaic operation data. After being transmitted to the central control unit by the distribution automation edge device, they are sent to the photovoltaic inverter by the protocol conversion unit to dispatch and control the distributed photovoltaic.

[0011] The protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data with a unified protocol, including: The communication adapter module transmits the distributed photovoltaic operation data collected by the photovoltaic inverter; The protocol recognition module recognizes and compares the communication protocol used by the distributed photovoltaic operation data, and outputs the recognition result and the distributed photovoltaic operation data; The data acquisition module collects the identification results and distributed photovoltaic operation data and uploads them to the protocol conversion module; The protocol conversion module converts the received identification results and distributed photovoltaic operation data into data with unified protocols and outputs them to the central control unit.

[0012] The above also includes the following steps: The metering unit collects the voltage and current on the user side, calculates the power consumption of distributed photovoltaic power generation users, and outputs the calculation results; The distribution automation edge device receives the calculation results and determines whether the user is in arrears based on the calculation results; In response to "yes", a signal for tripping the switch due to overdue payment is output to the central control unit, and the central control unit performs the user-side tripping operation; In response to "no", the marketing electricity consumption information collection system determines whether a user payment signal is received; In response to this, the marketing electricity consumption information collection system outputs the user payment signal to the metering unit; after receiving the user payment signal, the metering unit sends a payment closing pulse signal to the central control unit to control the user side closing; If the response is no, the marketing electricity consumption information collection system outputs a user non-payment signal to the distribution automation edge device, and the distribution automation edge device outputs an arrears trip signal to the central control unit to control the user-side trip.

[0013] The third technical solution of the present invention is implemented in the following manner: a storage medium storing a computer program that can be read by a computer, wherein the computer program is configured to execute a low-voltage distributed photovoltaic grid-connected control method when running.

[0014] The fourth technical solution of the present invention is implemented in the following manner: a terminal includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing steps in the low-voltage distributed photovoltaic grid-connected control method.

[0015] The fifth technical solution of the present invention is implemented in the following manner: an electronic device includes a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement a low-voltage distributed photovoltaic grid-connected control method.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets a distributed photovoltaic monitoring and control device, which is connected to the photovoltaic inverter and the distribution network. The protocol conversion unit of the distributed photovoltaic monitoring and control device identifies and collects the operating status of the distributed photovoltaic via the photovoltaic inverter, and the identified and collected data is parsed by the central control unit and uploaded to the distribution network, and output to the distribution automation master station and the marketing electricity information collection system via the distribution automation edge device of the distribution network. The power grid company can realize the monitoring and control of the distributed photovoltaic in the intranet. At the same time, the distribution network can issue control instructions to the distributed photovoltaic monitoring and control device, and the distributed photovoltaic monitoring and control device realizes the dispatching control of the distributed photovoltaic via the photovoltaic inverter. Therefore, the present invention realizes the effect of monitoring the operating status of the distributed photovoltaic in the distributed photovoltaic grid-connected device, which is convenient for the research and management of the distributed photovoltaic comprehensive device.

[0017] 2. The device of the present invention has a simple structure and is easy to install. Through the distributed photovoltaic grid-connected device, the distributed photovoltaic status monitoring and metering are integrated to realize the status monitoring of distributed photovoltaics, save equipment investment, and improve the convenience of on-site installation.

[0018] 3. The present invention can be compatible with various types of photovoltaic inverters and communicate normally with them by setting a protocol conversion unit, thereby improving the convenience of distributed photovoltaic operation data collection and facilitating large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the device structure of Example 1 of the present invention.

[0021] Figure 2 This is a flowchart of Example 1 of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation location of the distributed photovoltaic grid-connected device in Example 1 of the present invention.

[0023] Figure 4 This is a flow chart of the low-voltage distributed photovoltaic grid-connected control method in Example 3 of the present invention.

[0024] Figure 5 This is a flow chart of the method for converting data by the protocol conversion unit in Example 3 of the present invention.

[0025] Figure 6 This is a method flow chart of the metering unit in Example 3 of the present invention.

[0026] In the figure: 1- box, 2- mounting plate, 3- mutual inductor, 4- grounding copper busbar, 5- isolating knife switch, 6- meter, 7- meter connector, 8- distributed photovoltaic monitoring and control device. DETAILED DESCRIPTION

[0027] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0028] Example 1: Figure 1-3 As shown, an embodiment of the present invention discloses a low-voltage distributed photovoltaic grid-connected device, including a distributed photovoltaic grid-connected device, a photovoltaic inverter and a distribution network; the distribution network includes a distribution automation edge device, a marketing electricity information collection system and a distribution automation master station, and the marketing electricity information collection system and the distribution automation master station are both connected to the distribution automation edge device; the distributed photovoltaic grid-connected device includes a box 1 and a distributed photovoltaic monitoring and control device 8 installed in the box 1, the distributed photovoltaic monitoring and control device 8 includes a protocol conversion unit and a central control unit, the protocol conversion unit is respectively connected to the photovoltaic inverter and the central control unit, and the central control unit is connected to the distribution automation edge Device connection; the distributed photovoltaic monitoring and control device 8 is connected to the photovoltaic inverter and the distribution network. The protocol conversion unit of the distributed photovoltaic monitoring and control device 8 identifies and collects the operating status of the distributed photovoltaic via the photovoltaic inverter, and the identified and collected data is parsed by the central control unit and uploaded to the distribution network, and output to the distribution automation master station and the marketing electricity information collection system via the distribution automation edge device of the distribution network. The power grid company can monitor and control the distributed photovoltaic on the intranet, and the distribution network can issue control instructions to the distributed photovoltaic monitoring and control device 8. The distributed photovoltaic monitoring and control device 8 realizes the dispatching control of the distributed photovoltaic via the photovoltaic inverter.

[0029] Among them, the functions of the central control unit are as follows: 1. Collect the data output by the protocol conversion unit, analyze, organize, identify abnormalities and report the collected data, and upload the data to the distribution automation edge device; the collected data includes the voltage, current, electric energy and action alarm signals on the distributed photovoltaic side and the distribution network side; 2. Receive the instructions output by the distribution automation edge device, and adjust the operating data of the photovoltaic inverter according to the output instructions; the instructions include remote opening and closing, parameter configuration, data retrieval, timing, software upgrade, etc.; that is, the central control unit can adjust the operating data such as the power generation power and voltage of the photovoltaic inverter according to the instructions of the parameter configuration; the central control unit can control the opening and closing operations on the user side according to the remote opening and closing instructions.

[0030] Among them, the distribution automation edge device can be an intelligent fusion terminal for the substation.

[0031] Among them, the functions of the protocol conversion unit are as follows: 1. Adaptively identify the communication protocol of the photovoltaic inverter, and convert the distributed photovoltaic operation data collected by photovoltaic inverters using different communication protocols into data with a unified protocol, and output it to the central control unit to realize data collection, automatic identification and output of communication protocols; 2. Receive the control signal output by the central control unit, adjust the power generation power, voltage, etc. of the photovoltaic inverter, and realize the regulation of distributed photovoltaic by the power grid.

[0032] like Figure 2 As shown, the protocol conversion unit includes a protocol conversion module, a data acquisition module, a protocol identification module and a communication switching module. The communication switching module is connected to the photovoltaic inverter, the communication switching module, the protocol identification module, the data acquisition module and the protocol conversion module are connected in sequence, and the protocol conversion module is connected to the central control unit.

[0033] Among them, the communication adapter module: 1. Connected to the photovoltaic inverter through RS485, RS232, USB, RJ45, 4-core aviation plug and other interfaces to adapt to the communication interfaces of photovoltaic inverters of different models; 2. Connected to the protocol identification module through the UART serial port to transmit the distributed photovoltaic operation data collected by the photovoltaic inverter.

[0034] Among them, the protocol identification module stores various photovoltaic inverter communication protocols such as Modbus, which is used to identify and compare the communication protocols used by the distributed photovoltaic operation data transmitted through the communication adapter module, and transmit the identification results and distributed photovoltaic operation data to the data acquisition module.

[0035] Among them, the data acquisition module collects the identification results and distributed photovoltaic operation data, and uploads them to the protocol conversion module. The collected distributed photovoltaic operation data include: three-phase voltage, current, active power, reactive power, apparent power, power factor, harmonic voltage, harmonic current, interharmonic voltage content rate, interharmonic current content rate, frequency deviation, three-phase voltage / current imbalance, voltage fluctuation, flicker, equipment operation status, etc.

[0036] Among them, the protocol conversion module converts the distributed photovoltaic operation data into unified protocols such as DL / T645 and DL / T698.45 according to the distributed photovoltaic operation data transmitted by the data acquisition module and uploads it to the central control unit.

[0037] like Figure 1 As shown, a mounting plate 2 is provided on the inner side of the box body 1, on which a mutual inductor 3, a grounding copper busbar 4 and a metering unit are respectively mounted, and the metering unit includes a meter 6 and a meter connector 7; the mutual inductor 3 is respectively connected to the distribution network and the isolating knife switch 5, the isolating knife switch 5 is connected to the distributed photovoltaic monitoring and control device 8, the meter 6, the meter connector 7 and the distributed photovoltaic monitoring and control device 8 are connected in sequence, the meter 6 is connected to the distribution network, and the grounding copper busbar 4 is grounded.

[0038] When in use, the outgoing cable of the distribution network area enters the top of the isolation switch 5 through the mutual inductor 3, and the bottom of the isolation switch 5 is connected to the top of the distributed photovoltaic monitoring and control device 8 through a cable, and the grounding copper bus 4 is connected to the ground through the grounding body; the meter 6 is connected to the meter connector 7, the meter connector 7 is connected to the distributed photovoltaic monitoring and control device 8 through a cable, and the distributed photovoltaic monitoring and control device 8 is connected to the photovoltaic inverter; the secondary line of the mutual inductor 3 is connected to the meter connector 7.

[0039] During operation, the DC power generated by the low-voltage distributed photovoltaic power generation is converted into AC power by the photovoltaic inverter, and flows into the bottom of the isolation switch 5 through the distributed photovoltaic monitoring and control device 8, flows out from the top of the isolation switch 5 through the mutual inductor 3 and finally flows into the low-voltage distribution network, wherein the distributed photovoltaic monitoring and control device 8 is mainly used to realize the monitoring of voltage, current and other information of the low-voltage distributed photovoltaic power generation, short-circuit, anti-islanding and other protection, as well as control and other functions; the isolation switch 5 is mainly used to isolate the distribution network side and the low-voltage distributed power supply side to ensure the safe maintenance of the line and equipment; the mutual inductor 3 mainly converts large current into small current for subsequent measurement and monitoring.

[0040] Among them, meter 6 is used to collect voltage and current, calculate the power consumption of low-voltage distributed photovoltaic power generation users, and output the calculation results of user power consumption to the distribution automation edge device; and after receiving the user payment signal output by the marketing electricity consumption information collection system, it sends a payment closing pulse signal to the central control unit.

[0041] Among them, the specific protection logic for realizing island protection is: when the swing range of the collected voltage amplitude within the set time exceeds the threshold set by the central control unit, or when the swing range of the collected voltage frequency within the set time exceeds the threshold set by the central control unit, it is judged that the low-voltage distributed photovoltaic island operation is in progress, and the anti-island protection is started to disconnect the connection between the distributed photovoltaic monitoring and control device 8 and the isolation switch 5, so that the low-voltage distributed photovoltaic is quickly disconnected from the distribution network side, thereby ensuring the life safety of the low-voltage distributed photovoltaic related equipment and related maintenance personnel.

[0042] like Figure 2 As shown, the distributed photovoltaic monitoring and control device 8 also includes a remote communication unit, a data storage unit and a human-computer interaction unit. The data storage unit and the human-computer interaction unit are both connected to the central control unit, and the remote communication unit is respectively connected to the central control unit and the distribution automation edge device.

[0043] Among them, the remote communication unit is connected to the central control unit through a USB interface, and has power line carrier / micro-power wireless communication functions, which uploads the data information recorded by the central control unit to the distribution automation edge device.

[0044] Among them, the data storage unit can locally store the collected historical data, including voltage, current, electric energy, harmonics, fault events, SOE, etc.

[0045] Among them, the human-machine interaction unit is connected to the central control unit through an FC serial data line. Through the LCD screen of the human-machine interaction unit, various data information in the central control unit can be intuitively displayed. At the same time, the setting parameters can be modified on-site through the operation buttons on the human-machine interaction unit.

[0046] like Figure 2 As shown, it also includes a power supply unit, which is connected to the distributed photovoltaic monitoring and control device 8.

[0047] Among them, the power supply unit includes a direct power supply and a super capacitor, and can power the modules of the distributed photovoltaic monitoring and control device 8 by connecting to an external power supply or directly supplying power through the super capacitor when the external power supply disappears.

[0048] When working, the power supply unit is connected with the central control unit, protocol conversion unit, remote communication unit, data storage unit, and human-machine interaction unit to provide working power for each module. When the circuit on the distribution network side is normally energized, the DC power supply converts the 220V AC voltage into 12V DC voltage through the voltage conversion circuit to power all modules, and at the same time energizes the supercapacitor to keep it in the power storage state; when the distribution network side line is out of power, the supercapacitor acts as a backup power supply to provide temporary power supply for all modules.

[0049] Embodiment 2: The embodiment of the present invention discloses a method for converting Modbus protocol into DL / T645 protocol, wherein a protocol identification module stores a Modbus protocol summary table of multiple photovoltaic inverters, and uses information objects such as function codes, high bytes of register addresses, low bytes of register addresses, high bytes of register quantities, low bytes of register quantities, and total number of data bytes in different Modbus protocols as identification features, and identifies the Modbus protocol used by the photovoltaic inverter by constructing a request data structure and a response data structure message of the Modbus protocol summary table.

[0050] Among them, the Modbus protocol identification principle is as follows: After the photovoltaic inverter communicates normally with the protocol conversion module through the communication adapter module, the protocol identification module constructs a Modbus read request data structure with the Modbus protocol master table of multiple photovoltaic inverters stored, and sends the read request message to the photovoltaic inverter through the communication adapter module, and at the same time receives the Modbus response data structure message responded by the photovoltaic inverter, and determines whether the protocol identification module can correctly parse the Modbus response data structure. If the response is yes, it is determined that the Modbus communication protocol of the photovoltaic inverter is one of the ones stored in the Modbus protocol master table. If the response is no, it is determined that the Modbus communication protocol of the photovoltaic inverter is not one of the ones stored in the Modbus protocol master table. At this time, the Modbus protocol cannot be converted into the DL / T645 protocol.

[0051] Among them, the Modbus protocol conversion principle is as follows: The protocol conversion module constructs a mapping table of conversion logic according to the relationship between the Modbus protocol and the DL / T645 protocol, and is responsible for completing the conversion between the Modbus protocol and the DL / T645 protocol according to the mapping relationship. Specifically, when the protocol identification module identifies that the Modbus communication protocol of the photovoltaic inverter is one of the protocols stored in the Modbus protocol master table, the function code, high byte of register address, low byte of register address, high byte of register number, low byte of register number, total number of data bytes, high bit of data, low bit of data and other information objects of the photovoltaic inverter transmission data are parsed according to the corresponding Modbus protocol, and transmitted to the data acquisition module; the data acquisition module transmits the Modbus protocol identification result and the parsed data to the protocol conversion module, and the protocol conversion module converts the register address, total number of data bytes, data and other information objects into the information objects corresponding to the DL / T645 protocol according to the conversion logic mapping table between the Modbus protocol and the DL / T645 protocol, and uses the verification rule to complete the integrity verification of the converted data, and finally transmits the information object of the DL / T645 protocol to the central control unit.

[0052] Example 3: Figure 4As shown, the embodiment of the present invention discloses a low-voltage distributed photovoltaic grid-connected control method, comprising the following steps: S101, photovoltaic inverter collects distributed photovoltaic operation data; S102, a protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data with a unified protocol; S103, the central control unit receives the data in the unified protocol, summarizes and analyzes the data, and outputs it in the form of power line carrier / micro-power; S104, the distribution automation edge device receives the data output in the form of power line carrier / micropower, and uploads it to the marketing power consumption information collection system and the distribution automation master station; S105, the marketing electricity information collection system and the distribution automation master station send dispatch control instructions to the distribution automation edge device based on the distributed photovoltaic operation data. After being transmitted to the central control unit by the distribution automation edge device, it is sent to the photovoltaic inverter by the protocol conversion unit to perform dispatch control on the distributed photovoltaic.

[0053] like Figure 5 As shown, the protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data of a unified protocol, including: S1021, the communication adapter module transmits the distributed photovoltaic operation data collected by the photovoltaic inverter; S1022, the protocol identification module identifies and compares the communication protocol used by the distributed photovoltaic operation data, and outputs the identification result and the distributed photovoltaic operation data; S1023, the data acquisition module collects the identification results and distributed photovoltaic operation data, and uploads them to the protocol conversion module; S1024, the protocol conversion module converts the received identification results and distributed photovoltaic operation data into data with a unified protocol, and outputs the data to the central control unit.

[0054] like Figure 6 As shown, a low-voltage distributed photovoltaic grid-connected control method also includes the following steps: S201, the metering unit collects the voltage and current at the user side, calculates the power consumption of the distributed photovoltaic power generation user, and outputs the calculation result; S202, the distribution automation edge device receives the calculation result and determines whether the user is in arrears based on the calculation result; S203, in response to "yes", outputting a power-off signal for arrears to the central control unit, and the central control unit performs a power-off operation on the user side; S204, in response to "no", the marketing electricity consumption information collection system determines whether a user payment signal is received; S205, in response to "yes", the marketing electricity consumption information collection system outputs the user payment signal to the metering unit; after receiving the user payment signal, the metering unit sends a payment closing pulse signal to the central control unit to control the user side to close the switch; S206, in response to "no", the marketing electricity consumption information collection system outputs a user non-payment signal to the distribution automation edge device, and the distribution automation edge device outputs an arrears trip signal to the central control unit to control the user-side trip.

[0055] In summary, the present invention sets a distributed photovoltaic monitoring and control device 8, which is connected to the photovoltaic inverter and the distribution network. The protocol conversion unit of the distributed photovoltaic monitoring and control device 8 identifies and collects the operating status of the distributed photovoltaic via the photovoltaic inverter, and the identified and collected data is parsed by the central control unit and uploaded to the distribution network, and output to the distribution automation master station and the marketing electricity information collection system via the distribution automation edge device of the distribution network. The power grid company can realize the monitoring and control of the distributed photovoltaic in the intranet. At the same time, the distribution network can issue control instructions to the distributed photovoltaic monitoring and control device 8, and the distributed photovoltaic monitoring and control device 8 realizes the dispatching control of the distributed photovoltaic via the photovoltaic inverter. Therefore, the above-mentioned embodiment of the present invention realizes the effect of monitoring the operating status of the distributed photovoltaic in the distributed photovoltaic grid-connected device, which is convenient for the research and management of the distributed photovoltaic comprehensive device.

[0056] The device of the present invention has a simple structure and is easy to install. Through the distributed photovoltaic grid-connected device, distributed photovoltaic state monitoring and metering are integrated to achieve distributed photovoltaic state monitoring, save equipment investment, and improve the convenience of on-site installation.

[0057] The present invention can be compatible with various photovoltaic inverters and communicate normally with them by setting a protocol conversion unit, thereby improving the convenience of distributed photovoltaic operation data collection and facilitating large-scale promotion and application.

[0058] Embodiment 4: The embodiment of the present invention discloses a storage medium, on which a computer program readable by a computer is stored, and the computer program is configured to execute a low-voltage distributed photovoltaic grid-connected control method when running.

[0059] The above storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory, a mobile hard disk, a magnetic disk, or an optical disk.

[0060] Example 5: An embodiment of the present invention discloses a terminal, including a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing steps in a low-voltage distributed photovoltaic grid-connected control method.

[0061] Embodiment 6: The embodiment of the present invention discloses an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement a low-voltage distributed photovoltaic grid-connected control method.

[0062] The electronic device mentioned above further includes a transmission device and an input / output device, wherein the transmission device and the input / output device are both connected to the processor.

[0063] The above processor may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. It may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The memory may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk.

[0064] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0065] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0066] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0067] The embodiment of the present application also provides a computer program product, the computer program product includes a non-transitory computer-readable storage medium storing a computer program, the computer program is operable to cause a computer to execute some or all of the steps of any method described in the method embodiment. The computer program product may be a software installation package, and the computer includes an electronic device.

[0068] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A low voltage distributed photovoltaic grid-connected device, characterized in that: It includes a distributed photovoltaic grid-connected device, a photovoltaic inverter and a distribution network; the distribution network includes a distribution automation edge device, a marketing electricity information collection system and a distribution automation master station, and the marketing electricity information collection system and the distribution automation master station are both connected to the distribution automation edge device; the distributed photovoltaic grid-connected device includes a box and a distributed photovoltaic monitoring and control device installed in the box, and the distributed photovoltaic monitoring and control device includes a protocol conversion unit and a central control unit, and the protocol conversion unit is connected to the photovoltaic inverter and the central control unit respectively, and the central control unit is connected to the distribution automation edge device; the distributed photovoltaic monitoring and control device is connected to the photovoltaic inverter and the distribution network, and the protocol conversion unit of the distributed photovoltaic monitoring and control device identifies and collects the operating status of the distributed photovoltaic through the photovoltaic inverter, and the identified and collected data is parsed by the central control unit and uploaded to the distribution network, and output to the distribution automation master station and the marketing electricity information collection system through the distribution automation edge device of the distribution network. The power grid company can realize the monitoring and control of the distributed photovoltaic in the intranet, and the distribution network can issue control instructions to the distributed photovoltaic monitoring and control device, and the distributed photovoltaic monitoring and control device realizes the dispatching control of the distributed photovoltaic through the photovoltaic inverter.

2. A low-voltage distributed photovoltaic grid-connected device according to claim 1, characterized in that: The protocol conversion unit includes a protocol conversion module, a data acquisition module, a protocol identification module and a communication switching module. The communication switching module is connected to the photovoltaic inverter. The communication switching module, the protocol identification module, the data acquisition module and the protocol conversion module are connected in sequence. The protocol conversion module is connected to the central control unit.

3. A low-voltage distributed photovoltaic grid-connected device according to claim 1, characterized in that: A mounting plate is provided inside the box, on which mutual inductors, grounding copper busbars and metering units are respectively installed. The metering unit includes a meter and a meter connector. The mutual inductors are respectively connected to the distribution network and the isolating switch, the isolating switch is connected to the distributed photovoltaic monitoring and control device, the meter, the meter connector and the distributed photovoltaic monitoring and control device are connected in sequence, the meter is connected to the distribution network, and the grounding copper busbar is grounded.

4. A low-voltage distributed photovoltaic grid-connected device according to claim 1, characterized in that: The distributed photovoltaic monitoring and control device also includes a remote communication unit, a data storage unit and a human-computer interaction unit. The data storage unit and the human-computer interaction unit are both connected to the central control unit, and the remote communication unit is respectively connected to the central control unit and the distribution automation edge device; it also includes a power supply unit, which is connected to the distributed photovoltaic monitoring and control device.

5. A low voltage distributed photovoltaic grid-connected control method, characterized in that: The following steps are involved: Photovoltaic inverters collect distributed photovoltaic operation data; The protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data with unified protocol; The central control unit receives data in a unified protocol, summarizes and analyzes the data, and outputs it in the form of power line carrier / micropower; The distribution automation edge device receives data output in the form of power line carrier / micropower and uploads it to the marketing power consumption information collection system and the distribution automation master station; The marketing electricity information collection system and the distribution automation master station issue dispatching control instructions to the distribution automation edge device based on the distributed photovoltaic operation data. After being transmitted to the central control unit by the distribution automation edge device, they are sent to the photovoltaic inverter by the protocol conversion unit to dispatch and control the distributed photovoltaic.

6. A low voltage distributed photovoltaic grid-connected control method according to claim 5, characterized in that: The protocol conversion unit identifies the distributed photovoltaic operation data and converts it into data of a unified protocol, including: The communication adapter module transmits the distributed photovoltaic operation data collected by the photovoltaic inverter; The protocol recognition module recognizes and compares the communication protocol used by the distributed photovoltaic operation data, and outputs the recognition result and the distributed photovoltaic operation data; The data acquisition module collects the identification results and distributed photovoltaic operation data and uploads them to the protocol conversion module; The protocol conversion module converts the received identification results and distributed photovoltaic operation data into data with unified protocols and outputs them to the central control unit.

7. A low voltage distributed photovoltaic grid-connected control method according to claim 5, characterized in that: The following steps are also included: The metering unit collects the voltage and current on the user side, calculates the power consumption of distributed photovoltaic power generation users, and outputs the calculation results; The distribution automation edge device receives the calculation results and determines whether the user is in arrears based on the calculation results; In response to "yes", a signal for tripping the switch due to overdue payment is output to the central control unit, and the central control unit performs the user-side tripping operation; In response to "no", the marketing electricity consumption information collection system determines whether a user payment signal is received; In response to this, the marketing electricity consumption information is collected and output to the metering unit a user payment signal; After receiving the user's payment signal, the metering unit sends a payment closing pulse signal to the central control unit to control the user-side closing; If the response is no, the marketing electricity consumption information collection system outputs a user non-payment signal to the distribution automation edge device, and the distribution automation edge device outputs an arrears trip signal to the central control unit to control the user-side trip.

8. A storage medium, characterized in that: The storage medium stores a computer program that can be read by a computer, and the computer program is configured to execute the low-voltage distributed photovoltaic grid-connected control method according to any one of claims 5 to 7 when running.

9. A terminal, characterized in that: It includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the processor, and the program includes instructions for executing the steps in the low-voltage distributed photovoltaic grid-connected control method as described in any one of claims 5 to 7.

10. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the low-voltage distributed photovoltaic grid-connected control method as described in any one of claims 5 to 7.

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