Photovoltaic remote control device based on edge computing gateway

Abstract

The utility model discloses a photovoltaic remote control device based on an edge computing gateway, which is characterized in that a photovoltaic operation and maintenance system is in communication connection with the edge computing gateway, the edge computing gateway is respectively in communication connection with a photovoltaic inverter and network IO equipment, and the network IO equipment is electrically connected with a contactor; the edge computing gateway is used for sending photovoltaic data of the photovoltaic inverter to the photovoltaic operation and maintenance system; the photovoltaic operation and maintenance system is used for sending a contactor control instruction to the network IO equipment through the edge computing gateway according to the photovoltaic data; and the network IO equipment is used for controlling a contact switch of the contactor according to the contactor control instruction so as to remotely control the three-phase loop state of the photovoltaic power station. According to the utility model, through the combination of the characteristics of the edge computing gateway, the network IO equipment and the field traditional equipment and the electrical control theory, the turn-off sequence of the relays of the network IO equipment is set so as to realize the remote turn-on or turn-off of the main loop of the photovoltaic system, thereby avoiding the replacement of the equipment and reducing the reconstruction cost.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic control, and in particular to a photovoltaic remote control device based on an edge computing gateway. Background Art

[0002] At present, as the country has put forward various support policies for photovoltaic systems, the installed capacity of distributed photovoltaic systems is increasing. There are many equipment manufacturers, and data fragmentation exists, resulting in the inability to unify operation and maintenance and remote scheduling, and high transformation costs.

[0003] Traditional distributed photovoltaic system operations and maintenance rely on software provided by each PV manufacturer to receive data from individual PV devices, making it impossible to remotely control inverters and peripheral equipment. To achieve remote control, most solutions replace traditional peripheral devices with those equipped with communication interfaces. However, these solutions suffer from high replacement costs, a wide variety of communication protocols, and complex device access management, hindering centralized scheduling and management by operators. Therefore, achieving intelligent remote control for photovoltaic operations and maintenance while ensuring low costs, simple protocol integration, and device access has become a pressing issue.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of this utility model is to provide a photovoltaic remote control device based on edge computing gateway, aiming to solve the technical problem of how to achieve intelligent remote control of photovoltaic operation and maintenance while ensuring low cost, protocol integration and simple device access.

[0006] To achieve the above objectives, the present invention provides a photovoltaic remote control device based on an edge computing gateway, which includes a photovoltaic operation and maintenance system, an edge computing gateway, a photovoltaic inverter, a network IO device, and a contactor;

[0007] The photovoltaic operation and maintenance system is communicatively connected to the edge computing gateway, the edge computing gateway is communicatively connected to the photovoltaic inverter and the network IO device respectively, and the network IO device is electrically connected to the contactor;

[0008] The edge computing gateway is used to send the photovoltaic data of the photovoltaic inverter to the photovoltaic operation and maintenance system; the photovoltaic operation and maintenance system is used to send contactor control instructions to the network IO device through the edge computing gateway according to the photovoltaic data; the network IO device is used to control the contact switch of the contactor according to the contactor control instruction to realize remote control of the three-phase circuit state of the photovoltaic power station.

[0009] Optionally, the network IO device includes a first relay and a second relay, and the contactor includes a contactor coil;

[0010] The first relay, the second relay and the contactor coil are connected in series; the first relay is used to control the contactor coil to be powered off, and the second relay is used to control the contactor coil to be powered on.

[0011] Optionally, the contactor further includes a contactor normally open contact and a contactor main contact;

[0012] The second relay is connected in parallel with the normally open contact of the contactor; the main contact of the contactor is arranged on the three-phase circuit of the photovoltaic power station.

[0013] Optionally, the photovoltaic operation and maintenance system is used to send parameter adjustment instructions to the photovoltaic inverter through the edge computing gateway according to the photovoltaic data, so that the photovoltaic inverter adjusts the inverter parameters according to the parameter adjustment instructions.

[0014] Optionally, the contactor control instruction includes a contactor shut-off instruction;

[0015] The network IO device is used to disconnect the normally closed contact of the first relay according to the contactor shutdown instruction to de-energize the coil of the contactor, disconnect the normally open contact of the contactor and the main contact of the contactor, and close the normally closed contact of the first relay after a preset time, so as to realize remote control of the three-phase circuit disconnection of the photovoltaic power station.

[0016] Optionally, the contactor control instruction further includes a contactor closing instruction;

[0017] The network IO device is used to close the normally open contact of the second relay according to the contactor closing instruction, so as to energize the coil of the contactor, close the normally open contact of the contactor and the main contact of the contactor, and open the normally open contact of the second relay within a preset time range, so as to realize remote control of the three-phase circuit closure of the photovoltaic power station.

[0018] Optionally, the photovoltaic operation and maintenance system establishes a communication connection with the edge computing gateway through a preset communication protocol interface, and the edge computing gateway establishes a communication connection with the photovoltaic inverter and the network IO device through the preset communication protocol interface respectively.

[0019] In the present invention, the photovoltaic operation and maintenance system is communicatively connected to the edge computing gateway, which is communicatively connected to the photovoltaic inverter and the network IO device respectively, and the network IO device is electrically connected to the contactor. First, the edge computing gateway is used to send the photovoltaic data of the photovoltaic inverter to the photovoltaic operation and maintenance system. Then, the photovoltaic operation and maintenance system is used to send the contactor control instructions to the network IO device through the edge computing gateway according to the photovoltaic data. Thereafter, the network IO device is used to control the contactor switch according to the contactor control instructions to achieve remote control of the three-phase circuit state of the photovoltaic power station. In the prior art, the data of each photovoltaic device is received based on the software provided by each photovoltaic manufacturer, and the inverter and peripheral devices cannot be remotely controlled. However, in the present invention, by combining the characteristics of the edge computing gateway, the network IO device, the traditional on-site equipment and the electrical control theory, different switching sequences of multiple relays of the network IO device are set to achieve the goal of remotely closing and shutting down the main circuit of the photovoltaic system, avoiding equipment replacement and reducing transformation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the first embodiment of the photovoltaic remote control device based on the edge computing gateway of the utility model;

[0021] Figure 2 This is a schematic diagram of the connection between the edge computing gateway and the network IO module of the first embodiment of the photovoltaic remote control device based on the edge computing gateway of the utility model;

[0022] Figure 3 This is a schematic diagram of the contactor control circuit of the first embodiment of the photovoltaic remote control device based on edge computing gateway of the utility model.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The present invention provides a photovoltaic remote control device based on an edge computing gateway. Figure 1 , Figure 1 This is a flow chart of the first embodiment of the photovoltaic remote control device based on edge computing gateway of the present utility model.

[0026] In specific implementation, the utility model is applied to the operation and maintenance project of distributed photovoltaic power stations. Distributed photovoltaic power stations are scattered in various remote mountain villages in the local city. There are many inverter brands. Viewing power generation data and adjusting the operating status of equipment depend on on-site inspection and operation by operation and maintenance personnel, and the operation and maintenance costs are extremely high.

[0027] In this embodiment, the photovoltaic remote control device based on the edge computing gateway includes a photovoltaic operation and maintenance system 1001, an edge computing gateway 1002, a photovoltaic inverter 1003, a network IO device 1004 and a contactor 1005: the photovoltaic operation and maintenance system 1001 is communicatively connected to the edge computing gateway 1002, the edge computing gateway 1002 is communicatively connected to the photovoltaic inverter 1003 and the network IO device 1004 respectively, and the network IO device 1004 is electrically connected to the contactor 1005.

[0028] In the specific implementation, the device model of the edge computing gateway in the distributed photovoltaic power station operation and maintenance project is DTU-DP600R, the device model of the network IO device is ZS-DIO-R-10A, the device model of the contactor is CJ20-63, and the device model of the photovoltaic inverter is GW60KS-MT.

[0029] It should be understood that the edge computing gateway, network IO devices, contactors and photovoltaic inverters can be replaced with devices of different models having the same functions.

[0030] It should also be noted that the photovoltaic operation and maintenance system establishes a communication connection with the edge computing gateway through a preset communication protocol interface, and the edge computing gateway establishes a communication connection with the photovoltaic inverter and the network IO device through a preset communication protocol interface respectively.

[0031] The preset communication protocol interface may be a Modbus RS485 interface or another communication protocol interface.

[0032] In this implementation, reference Figure 2 , Figure 2 This is a schematic diagram of the connection between the edge computing gateway and the network IO module of the first embodiment of the photovoltaic remote control device based on the edge computing gateway of the utility model. The photovoltaic operation and maintenance system communicates with the edge computing gateway through the 4G network. The edge computing gateway is connected to the Modbus RS485 interface of the photovoltaic inverter through its own Modbus RS485 interface. The network IO device is connected to the Modbus RS485 interface of the edge computing gateway through its own Modbus RS485 interface. The edge computing gateway unifies the transmission protocol to achieve efficient data management. The contactor is connected to the relay interface of the network IO device through its own auxiliary contact.

[0033] refer to Figure 3 , Figure 3This is a schematic diagram of the contactor control circuit of the first embodiment of the photovoltaic remote control device based on the edge computing gateway of the utility model. In the figure, the network IO device includes a first relay (i.e., relay No. 1) and a second relay (i.e., relay No. 2), and the contactor includes a contactor coil. The first relay, the second relay and the contactor coil are connected in series; the first relay is used to control the power off of the contactor coil, and the second relay is used to control the power on of the contactor coil; the contactor also includes a contactor normally open contact and a contactor main contact; the contactor normally open contact is connected in parallel on the second relay; the contactor main contact is arranged on the three-phase circuit of the photovoltaic power station, and the three-phase circuit is connected to the photovoltaic inverter.

[0034] The edge computing gateway 1002 is used to send the photovoltaic data of the photovoltaic inverter 1003 to the photovoltaic operation and maintenance system 1001; the photovoltaic operation and maintenance system 1001 is used to send contactor control instructions to the network IO device 1004 through the edge computing gateway 1002 according to the photovoltaic data; the network IO device 1004 is used to control the contact switch of the contactor 1005 according to the contactor control instruction, so as to realize remote control of the three-phase circuit state of the photovoltaic power station.

[0035] It should be noted that the photovoltaic operation and maintenance system is used to send parameter adjustment instructions to the photovoltaic inverter through the edge computing gateway based on photovoltaic data, so that the photovoltaic inverter adjusts the inverter parameters according to the parameter adjustment instructions.

[0036] It should be understood that the edge computing gateway communicates with the central server of the photovoltaic operation and maintenance system via the 4G communication network, sending all collected data to the central server of the operation and maintenance system in the form of the MQTT protocol. The edge computing gateway unifies the transmission protocol to achieve efficient data management. The combination of the edge computing gateway and the photovoltaic inverter can remotely receive photovoltaic data from the photovoltaic inverter and remotely adjust the inverter parameters, thereby reducing operation and maintenance costs and increasing efficiency.

[0037] Since each photovoltaic power station is equipped with an edge computing gateway on site, it can integrate the data of multi-brand inverters into a unified platform. It can actively query and report all inverter data, and realize two-way data communication with the inverter. It can not only actively collect inverter data, but also execute the control instructions of the operation and maintenance platform, effectively reducing the computing pressure of the central server. When the operation and maintenance platform sends control instructions such as inverter switching or parameter adjustment to the edge computing gateway, the edge computing gateway sends the corresponding control instructions (i.e. switching instructions or parameter adjustment instructions) to the inverter through its own Modbus RS485 interface. After receiving the control instructions, the inverter can execute related switching, parameter adjustment and other actions according to the control instructions, thereby achieving the goal of remote scheduling of photovoltaic power generation.

[0038] It should be understood that the combination of edge computing gateways, network IO devices, and contactors allows for low-cost remote control of photovoltaic systems. This approach leverages the principles of three-phase motor start / stop control circuits and the characteristics of network IO relays. Two network IO relays form a group, with the normally closed contacts of the network IO relays acting as normally closed switches in the control circuit, and the normally open contacts of the network IO relays acting as normally open switches. By combining the electrical characteristics of edge computing gateways, network IO modules, and traditional contactors, along with control algorithms and simple circuit wiring, this approach allows for the cost-effective transformation of distributed photovoltaic power plants, enabling remote control and adjustment of their operation, addressing the need for remote O&M of traditional distributed photovoltaic power plants.

[0039] Furthermore, the contactor control instruction includes a contactor shutdown instruction, and the network IO device is used to disconnect the normally closed contact of the first relay according to the contactor shutdown instruction to de-energize the contactor coil, disconnect the normally open contact of the contactor and the main contact of the contactor, and close the normally closed contact of the first relay after a preset time to achieve remote control of the three-phase circuit disconnection of the photovoltaic power station.

[0040] The preset duration can be customized by the user and can be 3 seconds, 2 seconds, etc.

[0041] In specific implementation, when the O&M platform sends a contactor-off command to the edge computing gateway, the edge computing gateway transmits this control command to the network I / O device via its Modbus RS485 interface. This opens the normally closed contact of relay No. 1 on the network I / O device, de-energizing the contactor coil and disconnecting the normally open contact. Due to the characteristics of the contactor, the contacts of the three-phase main circuit open, thereby disconnecting the main circuit. To ensure repeatable control operations, the system controls relay No. 1 to return to its normally closed state three seconds after the close command is issued.

[0042] Furthermore, the contactor control instruction also includes a contactor closing instruction; the network IO device is used to close the normally open contact of the second relay according to the contactor closing instruction to energize the coil of the contactor, close the normally open contact of the contactor and the main contact of the contactor, and disconnect the normally open contact of the second relay within a preset time range to achieve remote control of the three-phase circuit closure of the photovoltaic power station.

[0043] In this embodiment, when the operation and maintenance platform sends a contactor close command to the edge computing gateway, the edge computing gateway sends this control command to the network I / O device via its Modbus RS485 interface. This closes the normally open contact of relay No. 2 on the network I / O device, energizing the contactor coil and closing the normally open contact. Based on the characteristics of the contactor, the contacts of the three-phase main circuit close, thus closing the main circuit. To ensure repeatable control operations, the system controls relay No. 2 to return to its normally open state three seconds after the close command is issued.

[0044] In the present invention, a photovoltaic operation and maintenance system is communicatively connected to an edge computing gateway, which is in communication with a photovoltaic inverter and a network I / O device, respectively. The network I / O device is electrically connected to a contactor. First, the edge computing gateway is used to transmit photovoltaic data from the photovoltaic inverter to the photovoltaic operation and maintenance system. Then, the photovoltaic operation and maintenance system is used to transmit contactor control instructions to the network I / O device via the edge computing gateway based on the photovoltaic data. The network I / O device is then used to control the contactor switches according to the contactor control instructions to remotely control the three-phase circuit status of the photovoltaic power station. The prior art receives data from each photovoltaic device based on software provided by each photovoltaic manufacturer, and is unable to remotely control the inverter and peripheral devices. However, the present invention integrates data from multiple inverter brands into a unified platform through the use of an edge computing gateway. Based on 4G communication technology, this achieves the goal of remote photovoltaic operation and maintenance. Simultaneously, it implements two-way data communication with the inverter, enabling both active acquisition of inverter data and execution of control instructions from the operation and maintenance platform to remotely adjust the parameters of the photovoltaic inverter.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic remote control device based on edge computing gateway, characterized in that: The photovoltaic remote control device based on the edge computing gateway includes a photovoltaic operation and maintenance system, an edge computing gateway, a photovoltaic inverter, a network IO device and a contactor; The photovoltaic operation and maintenance system is communicatively connected to the edge computing gateway, the edge computing gateway is communicatively connected to the photovoltaic inverter and the network IO device respectively, and the network IO device is electrically connected to the contactor; The edge computing gateway is used to send the photovoltaic data of the photovoltaic inverter to the photovoltaic operation and maintenance system; the photovoltaic operation and maintenance system is used to send contactor control instructions to the network IO device through the edge computing gateway according to the photovoltaic data; the network IO device is used to control the contact switch of the contactor according to the contactor control instruction to realize remote control of the three-phase circuit state of the photovoltaic power station.

2. The device according to claim 1, wherein The network IO device includes a first relay and a second relay, and the contactor includes a contactor coil; The first relay, the second relay and the contactor coil are connected in series; the first relay is used to control the contactor coil to be powered off, and the second relay is used to control the contactor coil to be powered on.

3. The device according to claim 2, wherein The contactor also includes a contactor normally open contact and a contactor main contact; The second relay is connected in parallel with the normally open contact of the contactor; the main contact of the contactor is arranged on the three-phase circuit of the photovoltaic power station.

4. The device according to claim 3, characterized in that The photovoltaic operation and maintenance system is used to send parameter adjustment instructions to the photovoltaic inverter through the edge computing gateway according to the photovoltaic data, so that the photovoltaic inverter adjusts the inverter parameters according to the parameter adjustment instructions.

5. The device according to claim 3, wherein The contactor control instruction includes a contactor shut-off instruction; The network IO device is used to disconnect the normally closed contact of the first relay according to the contactor shutdown instruction to de-energize the coil of the contactor, disconnect the normally open contact of the contactor and the main contact of the contactor, and close the normally closed contact of the first relay after a preset time, so as to realize remote control of the three-phase circuit disconnection of the photovoltaic power station.

6. The device according to claim 3, wherein The contactor control instruction also includes a contactor closing instruction; The network IO device is used to close the normally open contact of the second relay according to the contactor closing instruction, so as to energize the coil of the contactor, close the normally open contact of the contactor and the main contact of the contactor, and open the normally open contact of the second relay within a preset time range, so as to realize remote control of the three-phase circuit closure of the photovoltaic power station.

7. The device according to claims 1 to 6, characterized in that The photovoltaic operation and maintenance system establishes a communication connection with the edge computing gateway through a preset communication protocol interface, and the edge computing gateway establishes a communication connection with the photovoltaic inverter and the network IO device through the preset communication protocol interface respectively.

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