A new energy grid-connected metering installation intelligent practical training device and method

Abstract

The utility model provides a kind of new energy grid-connected metering installation intelligent practical training device, including new energy grid-connected metering installation intelligent practical training cabinet and control system background software, new energy grid-connected metering installation intelligent practical training cabinet includes touch all-in-one machine, network switch, voltage power amplifier, current power amplifier, PLC programmable controller, self-healing type attachment unit;The control system background software runs in touch all-in-one machine, and interconnection and intercommunication between intelligent wiring module, safety protection equipment that voltage power amplifier, current power amplifier, PLC programmable controller are formed are realized to network in by network switch local area network;The utility model has the detection of wiring technology under different metering point and metering mode and the automatic detection determination function of wiring correctness, can effectively save cost and improve the hands-on operation ability of trainees.

Description

Technical Field

[0001] This invention relates to the fields of new energy power generation and electricity metering, specifically to an intelligent training device and method for installing new energy grid-connected metering. Background Technology

[0002] A large number of new energy power generation systems, primarily photovoltaic (PV) power, are being connected to the grid. Depending on the capacity and usage of the power generation system, different connection methods and equipment are used, resulting in various grid-connected operation models. Common models include centralized power purchase and sales with full grid connection, and self-consumption with surplus power connected to the grid. The metering equipment includes direct-connect energy meters for power generation and consumption, and transformer-connected energy meters. Connection locations include property boundary points, user grid connection points, and different metering points on the user's load side. This differs significantly from conventional metering methods. Traditional meter installation and connection skills are insufficient for marketing needs, necessitating targeted skills training for relevant power employees on grid-connected metering device installation and other related tasks to improve the overall technical and professional competence of frontline workers. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an intelligent training device for the installation of new energy grid-connected metering. Applied to new energy grid-connected metering equipment, it adds training functions for metering equipment installation at different metering points—specifically, the property boundary, the user's grid connection point, and the user's load side—when new energy is fully connected to the grid and surplus electricity is connected. The application of a self-healing connection unit effectively provides convenience and flexibility in installation. The automatic detection and judgment functions for wiring processes and correctness under different metering points and methods effectively save costs and improve the hands-on skills of trainees.

[0004] The present invention adopts the following technical solution.

[0005] On the one hand, this patent provides a smart training device for the installation of new energy grid-connected metering, including a smart training cabinet for the installation of new energy grid-connected metering and control system backend software. The smart training cabinet for the installation of new energy grid-connected metering includes a touch screen all-in-one machine, a network switch, a voltage power amplifier, a current power amplifier, a PLC programmable controller, and a self-healing assembly unit.

[0006] The background software of the control system runs on the touch screen all-in-one machine, and realizes the interconnection and interoperability between the voltage power amplifier, current power amplifier, intelligent wiring module composed of PLC programmable controller, and safety protection equipment in the local area network composed of network switches.

[0007] The intelligent training cabinet for new energy grid-connected metering installation also includes a three-phase energy meter and a serial port server. The three-phase energy meter serves as the installation device for the intelligent training device for new energy grid-connected metering installation, connecting to the instrument interface and being converted to an Ethernet port for access to the local area network via the serial port server.

[0008] The device also includes a main power switch, a start button, a stop button, and status and alarm indicators, which are located on one side of the intelligent training cabinet for new energy grid-connected metering installation.

[0009] Furthermore, the touch screen all-in-one machine, voltage power amplifier, current power amplifier, and PLC programmable controller are connected to the local area network via Ethernet port, and the background software of the touch screen all-in-one machine's operation control system controls the three-phase energy meter.

[0010] Furthermore, the self-healing mounting unit uses self-tapping screws to install the metering energy meter, junction box, grid-connected circuit breaker and disconnecting switch on the self-healing mounting plate; it can be freely installed at any position within the range of the self-healing mounting unit, the self-healing mounting unit is flexible to replace and can be self-healed and reused.

[0011] Furthermore, the intelligent training cabinet for new energy grid-connected metering installation adopts a cabinet structure with casters at the bottom for easy movement. It features a double-sided design, with each side serving as an independent workstation for training. The cabinet panel includes a touch-screen all-in-one machine for the backend software of the operation control system, a self-healing assembly unit, and a wiring area. The cabinet interior is embedded with components for power simulation, intelligent wiring detection, and safety protection. The bottom of the cabinet features a pull-out tool drawer for storing assembly tools and cables.

[0012] Furthermore, the intelligent training device for new energy grid-connected metering installation also includes a wiring area;

[0013] The wiring panel has external electrical input terminals corresponding to the connection points of each metering point under both full grid connection and surplus grid connection metering modes; the wiring panel has built-in voltage power amplifiers and current power amplifiers, which realize the output control of the power generation system based on the power flow calculation results of the control system background software; the wiring panel has built-in PLC programmable controller to control the output channels of voltage power amplifiers and current power amplifiers, and compares them with the feedback output of the metering energy meter to realize the function of detecting and judging the correctness of the wiring circuit.

[0014] Furthermore, the secondary electrical quantity output and contact electrical quantity output of components at different positions in the corresponding system electrical main wiring diagram under different grid connection metering methods.

[0015] Furthermore, by differentiating the control input functions of electrical quantities at each output contact and comparing and analyzing the feedback data from the metering energy meter with the telemetry feedback data, a human-machine interface is provided to display the main electrical wiring circuit of the system in the surplus power grid connection mode and the full power grid connection mode. The main electrical wiring circuit can be automatically switched through the buttons on the human-machine interface, and the electrical quantity values ​​of each node and metering point can be displayed. Real-time measurement data of the metering energy meter can be obtained through the communication network.

[0016] Furthermore, the safety protection equipment can be started locally and remotely, and has overload protection, as well as input status monitoring, alarm indication, and alarm hard contact output functions.

[0017] Furthermore, the three-phase energy meter includes a direct-through three-phase energy meter and a transformer-type three-phase energy meter;

[0018] The direct-connect three-phase energy meter is equipped with a maximum direct current capacity of 40A and supports direct connection to the metering circuit of a power generation system with a capacity of up to 20kW.

[0019] The current transformer type three-phase energy meter, through the input of the current transformer, simulates the secondary output of the current transformer by controlling the output of the current power amplifier, thereby realizing the simulation of electrical quantities of the metering circuit and data of the metering device in a power generation system of any capacity.

[0020] On the other hand, this patent provides a smart training method for the installation of grid-connected metering for new energy sources:

[0021] When the device is started, the intelligent training device for grid-connected metering of new energy is powered on, the cabinet operation light is on, and the control system background software through the touch screen all-in-one machine selects the full grid connection mode or the surplus grid connection mode. The control system background software displays the primary system wiring diagram of the selected grid connection mode. The wiring diagram has designated metering points. Based on the current main wiring and the preset power generation, user load and power generation system capacity values, the control background performs electrical power flow calculation and calculates the voltage and electrical quantity values ​​of each metering point in the main wiring.

[0022] The activation of the protection interlock circuit disconnects the wiring area and requires the connection of the electrical output at the wiring location to protect the safety of the wiring personnel and equipment. Trainees should select the equipment and perform wiring operations according to the selected main wiring operation mode.

[0023] After wiring is completed, the human-machine interface in the backend will automatically perform wiring correctness detection. If an electrical short circuit or grounding fault is found, the fault light will illuminate, prompting you to check the wiring. The correctness of the wiring operation will be judged based on the detection results, and the judgment result will be output.

[0024] The device stops operating, the operating light goes out, and the assembly operation is complete.

[0025] The beneficial effects of this invention are that, compared with existing technologies, it combines the design of the State Grid's standard setup with the actual on-site operating environment, encompassing simulation functions for power generation system equipment wiring and grid-connected equipment wiring. It provides a flexible installation and wiring platform for users during practical installation training, saving installation costs. The self-healing wiring unit features reusability, convenience, flexible installation, and automatic detection of wiring processes and correctness. It achieves full recording of the new energy grid-connected metering installation and wiring process, as well as intelligent judgment of operational correctness, improving the hands-on installation skills of trainees. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the intelligent training device for metering and installation of new energy grid connection.

[0027] Figure 2 This is a communication network topology diagram of the intelligent training device for metering and installation of new energy grid-connected devices.

[0028] Figure 3 This is a flowchart of the operation of the intelligent training device for metering and installation of new energy grid connection. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0030] See Figure 1The intelligent training device for new energy grid-connected metering installation includes an intelligent training cabinet for new energy grid-connected metering installation. The cabinet includes a touch-screen all-in-one machine, a self-healing wiring unit, a metering energy meter, a junction box, a wiring area, a tool drawer, a main power switch, a start button, a stop button, and status and alarm indicators. The touch-screen all-in-one machine runs the control system's backend software, enabling centralized monitoring and control of the above equipment. The main power switch, start button, stop button, and status and alarm indicators are located on one side of the intelligent training cabinet. The touch-screen all-in-one machine, self-healing wiring unit, metering energy meter, junction box, wiring area, and tool drawer are located on the front of the intelligent training cabinet. The intelligent training cabinet for new energy grid-connected metering installation adopts a cabinet structure with casters at the bottom for easy movement. It features a double-sided design, with each side serving as an independent training station. The cabinet panel includes a touch-screen all-in-one machine for the backend software of the operation control system, self-healing assembly units, and a wiring area. The cabinet interior embeds components for power simulation, intelligent wiring detection, and safety protection. The bottom of the cabinet features a pull-out tool drawer for storing assembly tools and cables. The self-healing wiring unit uses self-tapping screws on a self-healing assembly plate to install and connect control components such as energy meters, junction boxes, grid-connected circuit breakers, and disconnect switches. It can be freely installed at any position within the self-healing assembly unit's range. The self-healing assembly unit is flexible to replace and can be reused after self-healing, enabling training on the installation of metering equipment at each metering point in both full grid connection and surplus power grid connection modes. The wiring panel shown has external electrical input terminals corresponding to the connection positions of each metering point under both full grid connection and surplus grid connection metering methods. Each terminal has a clear component identification symbol, which is consistent with the wiring diagram of the distribution box and metering box in the substation area. The corresponding component positions can be found on the primary electrical wiring diagram. Built-in voltage and current power amplifiers are used to control the power output of the power generation system based on the power flow calculation results of the control system's backend software. Secondary electrical outputs and contact electrical outputs are provided for components at different positions on the system's primary electrical wiring diagram under different grid connection metering methods. The control system's backend software runs on a touch-screen all-in-one machine and uses a local area network composed of network switches to achieve interconnection and interoperability between intelligent wiring modules and safety protection devices, including voltage and current power amplifiers, PLC programmable controllers, etc. The built-in PLC programmable controller in the wiring area controls the output channels of the voltage and current power amplifiers and compares them with the feedback output of the metering energy meter to realize the function of detecting and judging the correctness of the wiring circuit.By differentiating the control input functions of electrical quantities at each output contact and comparing and analyzing the feedback data from the metering energy meter with the communication telemetry, a human-machine interface is provided to display the system's main electrical wiring circuit in both the surplus power grid-connected mode and the full power grid-connected mode. Automatic switching of the main electrical wiring circuit is achieved via buttons on the electrical screen, displaying the electrical quantity values ​​of each node and metering point. Real-time measurement data from the metering energy meter is obtained through the communication network. The tool drawer is used for storing wiring materials and tools.

[0031] The safety equipment protection element has local and remote start and stop control functions, leakage and overload protection functions, and input status monitoring, alarm indication, and alarm hard contact output functions.

[0032] Three-phase energy meters include direct-through three-phase energy meters and transformer-type three-phase energy meters;

[0033] The direct-connect three-phase energy meter is configured with a maximum direct current capacity of 40A, supporting direct connection to metering circuits of power generation systems up to 20kW. It meets the data access requirements for metering systems of 8kW, 12kW, and 16kW. In the direct-connect circuit, the primary current can be output as an adjustable current of 0-30A by a current power amplifier, and the voltage power amplifier outputs 220V / 380V AC voltage. Simulation control software controls the output of 12A, 18A, and 24A primary currents on single-phase cable lines, achieving simulated output of electrical quantities for circuits with three or more fixed capacities.

[0034] The current transformer type three-phase energy meter, through the input of the current transformer, simulates the secondary output of the current transformer by controlling the output of the current power amplifier, thereby realizing the simulation of electrical quantities of the metering circuit and data of the metering device in a power generation system of any capacity.

[0035] The PLC programmable controller automates the detection of wiring correctness and provides protection against open and short circuits in the wiring circuit. Combined with power amplifier output and energy meter feedback data, it enables circuit safety monitoring before power-on and electrical quantity comparison and analysis after power-on, ensuring the accuracy of automatic wiring correctness determination.

[0036] See Figure 2The intelligent training device for new energy grid-connected metering installation is divided into two categories: installation equipment and simulation equipment. A local area network (LAN) is formed by network switches. The installation equipment mainly refers to three-phase energy meters, which use RS485 interfaces converted to Ethernet ports via a serial server to access the LAN. Touchscreen all-in-one machines, voltage power amplifiers, current power amplifiers, and PLC programmable controllers are connected to the LAN via Ethernet ports. The touchscreen all-in-one machine's backend software controls the voltage power amplifiers, current power amplifiers, PLC programmable controllers, and three-phase energy meters connected to the LAN. The simulation control system backend can select operating modes, calculate the current power flow results at each connection point through operating commands, and drive the voltage power amplifiers and current power amplifiers to output power from the power generation system in pairs. After installation, the three-phase energy meters are connected to the training operation via wiring area cables to achieve the function of checking specified operating data. Feedback is provided based on the communication data from the three-phase energy meters.

[0037] This embodiment provides a specific implementation method for installation and operation training.

[0038] See Figure 3 After the trainees are ready, they press the "Start" button. The intelligent training device for new energy grid-connected metering installation is powered on, and the cabinet's operation light illuminates. The trainees select the grid connection mode (full grid connection, surplus power grid connection) through the touch-screen all-in-one control system's backend software. The backend software displays the primary system wiring diagram for the selected grid connection mode, showing the designated metering points. Based on the current main wiring and preset power generation, user load, and power generation system capacity, the backend software performs electrical flow calculations, determining the voltage and electrical quantities at each metering point in the main wiring. The start-up protection interlock circuit disconnects the power output at the connection point required for the equipment installation, protecting the safety of the wiring personnel and equipment. Trainees then select and connect the equipment according to the chosen main wiring operation mode. During wiring, a fault light illuminates if an electrical short circuit or grounding fault occurs, prompting a check of the wiring. After wiring is completed, the backend human-machine interface automatically checks the wiring correctness and evaluates the correctness of the wiring operation based on the test results, outputting the evaluation result. Pressing the "Stop" button turns off the operation light, ending the installation operation.

[0039] The beneficial effects of this invention are that, compared with existing technologies, it combines the design of the State Grid's standard setup with the actual on-site operating environment, encompassing simulation functions for power generation system equipment wiring and grid-connected equipment wiring. It provides a flexible installation and wiring platform for users during practical installation training, saving installation costs. The self-healing wiring unit features reusability, convenience, flexible installation, and automatic detection of wiring processes and correctness. It achieves full recording of the new energy grid-connected metering installation and wiring process, as well as intelligent judgment of operational correctness, improving the hands-on installation skills of trainees.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A smart training device for new energy grid-connected metering installation, comprising a smart training cabinet for new energy grid-connected metering installation and control system backend software, characterized in that: The intelligent training cabinet for grid-connected metering of new energy includes a touch screen all-in-one machine, a network switch, a voltage power amplifier, a current power amplifier, a PLC programmable controller, and a self-healing assembly unit. The self-healing mounting unit uses self-tapping screws to install the energy meter, junction box, grid-connected circuit breaker and disconnector on the self-healing mounting plate; it can be freely installed at any position within the range of the self-healing mounting unit, the self-healing mounting unit is flexible to replace and can be reused after self-healing; it has the function of detecting the wiring process and automatically detecting and judging the wiring correctness under different metering points and metering methods. The background software of the control system runs on the touch screen all-in-one machine, and realizes the interconnection and interoperability between the voltage power amplifier, current power amplifier, intelligent wiring module composed of PLC programmable controller, and safety protection equipment in the local area network composed of network switches. The intelligent training cabinet for new energy grid-connected metering installation also includes a three-phase energy meter and a serial port server. The three-phase energy meter serves as the installation device for the intelligent training device for new energy grid-connected metering installation, connecting to the instrument interface and being converted to an Ethernet port for access to the local area network via the serial port server. The intelligent training device for new energy grid-connected metering installation also includes a wiring area; The wiring panel has external electrical input terminals for the connection points of each metering point under both full grid connection and surplus grid connection metering methods; and secondary electrical outputs and contact electrical outputs for components at different positions on the main electrical wiring diagram of the system under different grid connection metering methods. The wiring panel has built-in voltage power amplifiers and current power amplifiers. The output of the power generation system is controlled by the power flow calculation results of the background software of the control system. The wiring panel has built-in PLC programmable controller to control the output channels of voltage power amplifiers and current power amplifiers. It communicates with the energy meter to compare the feedback output and realizes the function of detecting and judging the correctness of the wiring circuit. The three-phase energy meters include direct-flow three-phase energy meters and transformer-type three-phase energy meters; The direct-connect three-phase energy meter is equipped with a maximum direct current capacity of 40A and supports direct access to metering circuits of power generation systems up to 20kW. It meets the access requirements for metering data of power generation systems of 8kW, 12kW, and 16kW. In the direct-connect type circuit, the primary current is output by a current power amplifier with an adjustable current of 0 to 30A, and the voltage power amplifier outputs 220V and 380V AC voltage. Through simulation control software, it can realize the primary current output of 12A, 18A, and 24A on single-phase cable lines, and realize the simulation output of electrical quantities of circuits with three or more fixed capacities. The current transformer type three-phase energy meter, through the input of the current transformer, simulates the secondary output of the current transformer by controlling the output of the current power amplifier, thereby realizing the simulation of electrical quantities of the metering circuit and data of the metering device of any capacity power generation system. The device also includes a main power switch, a start button, a stop button, and status and alarm indicators, which are located on one side of the intelligent training cabinet for new energy grid-connected metering installation.

2. The intelligent training device for new energy grid-connected metering installation according to claim 1, characterized in that: The touch screen all-in-one machine, voltage power amplifier, current power amplifier, and PLC programmable controller are connected to the local area network via Ethernet port. The background software of the touch screen all-in-one machine's operation control system controls the three-phase energy meter.

3. The intelligent training device for new energy grid-connected metering installation according to claim 1, characterized in that: The intelligent training cabinet for new energy grid-connected metering installation adopts a cabinet structure with casters at the bottom for easy movement. It features a double-sided design, with each side serving as an independent workstation for training. The cabinet panel includes a touch-screen all-in-one machine for the backend software of the operation control system, a self-healing assembly unit, and a wiring area. The cabinet interior is embedded with components for power simulation, intelligent wiring detection, and safety protection. The bottom of the cabinet features a pull-out tool drawer for storing assembly tools and cables.

4. The intelligent training device for new energy grid-connected metering installation according to claim 1, characterized in that: By comparing and analyzing the differentiated control input functions of electrical quantities at each output contact and the feedback data from the metering energy meter and the telemetry, a human-machine interface is provided to display the main electrical wiring circuit of the system in the surplus power grid connection mode and the full power grid connection mode. The main electrical wiring circuit can be automatically switched through the buttons on the human-machine interface, and the electrical quantity values ​​of each node and metering point can be displayed. Real-time measurement data of the metering energy meter can be obtained through the communication network.

5. The intelligent training device for new energy grid-connected metering installation according to claim 1, characterized in that: The safety protection equipment can be started locally and remotely, and has overload protection. It also has functions for monitoring input status, alarm indication, and alarm hard contact output.

6. A method for intelligent training on the installation of grid-connected metering for new energy sources, implemented based on the intelligent training device for the installation of grid-connected metering for new energy sources as described in any one of claims 1-5, characterized in that: When the device is started, the intelligent training device for grid-connected metering of new energy is powered on, the cabinet operation light is on, and the control system background software through the touch screen all-in-one machine selects the full grid connection mode or the surplus grid connection mode. The control system background software displays the primary system wiring diagram of the selected grid connection mode. The wiring diagram has designated metering points. Based on the current main wiring and the preset power generation, user load and power generation system capacity values, the control background performs electrical power flow calculation and calculates the voltage and electrical quantity values ​​of each metering point in the main wiring. The activation of the protection interlock circuit disconnects the wiring area and requires the connection of the electrical output at the wiring location to protect the safety of the wiring personnel and equipment. Trainees should select the equipment and perform wiring operations according to the selected main wiring operation mode. After wiring is completed, the human-machine interface in the backend will automatically perform wiring correctness detection. If an electrical short circuit or grounding fault is found, the fault light will illuminate, prompting you to check the wiring. The correctness of the wiring operation will be judged based on the detection results, and the judgment result will be output. The device stops operating, the operating light goes out, and the assembly operation is complete.

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