An analog power grid field test platform

Abstract

The utility model belongs to the technical field of power system automation test equipment, specifically disclose a kind of simulation power grid field test platform, comprising: power grid test control system and the power grid operating condition simulation system of being arranged in environment room, power grid test control system controls power grid operating condition simulation system;Power grid operating condition simulation system includes power grid circuit and the signal generator, relay, attenuator and power grid load component connected with power grid circuit;Signal generator injects interference signal to power grid circuit;Attenuator is electrically connected between power grid test control system and power grid circuit, attenuator is used to attenuate signal in power grid circuit;Relay is used for power grid circuit intercommunication or disconnect;Power grid load component is used to simulate the load of power grid circuit.The utility model effectively restores the complexity of the field of power grid system.

Description

Technical Field

[0001] This utility model belongs to the technical field of power system automation testing equipment, specifically relating to a simulated power grid field testing platform. Background Technology

[0002] With the application of various new products and technologies such as smart IoT meters, metering acquisition terminals, dual-mode communication units, smart circuit breakers, and various functional modules, the construction of new power systems is accelerating. As the "nerve endings" of the new power system, the reliability of metering acquisition terminals directly affects the transparency and digitalization of low-voltage distribution networks. However, the traditional testing system for metering acquisition terminals has structural defects, particularly lacking a testing component that simulates the actual application environment of the power grid, resulting in a persistently high failure rate of metering acquisition terminals in field applications.

[0003] To address this issue, publication number CN113746501A, entitled "A Simulation Device System and Test Method for Evaluating the Deepening Function of HPLC," specifically discloses the use of simulated environment equipment in the test simulation device system: a high-voltage attenuator with AC220V input and output and a carrier signal attenuation performance greater than 60dB; installed at different locations on the meter rack and connected to the meter via power lines to simulate the power supply network topology and simulate the on-site environment; a noise generator, installed at different locations on the meter rack, to simulate the real-world power line environment by loading collected on-site noise; and a three-phase power interface connected to the power module for transmitting power to various electronic components. Although the high-voltage attenuator, meter, and noise generator are used to simulate the real-world environment, environmental simulation distortion still exists, and the complexity of the power grid system on-site cannot be fully reproduced. Utility Model Content

[0004] The purpose of this invention is to provide a simulated power grid field testing platform, in which metering and acquisition terminals are tested in a realistic usage environment, thus restoring the on-site complexity of the power grid system.

[0005] The purpose of this utility model is achieved through the following technical solution: a simulated power grid field test platform is provided, comprising: a power grid test control system and a power grid operating condition simulation system installed in an environmental chamber. The power grid test control system controls the power grid operating condition simulation system. The power grid operating condition simulation system includes a power grid circuit and a signal generator, relays, attenuators, and power grid load components connected to the power grid circuit. The signal generator injects interference signals into the power grid circuit. The attenuator is electrically connected between the power grid test control system and the power grid circuit, and is used to attenuate signals in the power grid circuit. The relay is used to connect or disconnect the power grid circuit. The power grid load components are used to simulate the load of the power grid circuit.

[0006] Preferably, the power grid circuit includes several meters and power lines; the power lines include a main power line and branch power lines connected to the main power line; the main power line is connected to the power grid test and control system, the signal generator and power grid load components are connected to the main power line, and the meters and relays are installed in the branch power lines.

[0007] Preferably, the grid load component includes any one or a combination of a three-phase load cell, a motor, and a photovoltaic power generation device; the motor and the three-phase load cell are connected to the grid circuit, and the photovoltaic power generation device is installed on the outdoor roof of the environmental chamber, with its output terminal connected to the grid circuit.

[0008] Preferably, the power grid test and control system includes a host computer, a CCO master node, and STA slave nodes. The host computer is connected to the CCO master node via a USB to RS232 serial cable, and the STA slave nodes are connected to the CCO master node respectively. Each meter is equipped with one STA slave node.

[0009] Preferably, the CCO master node has a built-in HPLC communication module.

[0010] Preferably, it also includes a temperature and humidity sensor installed in the ambient room.

[0011] Preferably, the environmental chamber is equipped with an environmental control component, which is an integrated air conditioner with constant temperature and humidity.

[0012] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0013] The platform can accurately simulate complex transformer substation environments and communication environments, including factors such as attenuation, noise, load, topology, and number of users, by setting up environmental chambers, power grid circuits, three-phase power supplies, signal generators, power grid load components, relays, and attenuators according to pre-required settings. Under the monitoring of the power grid test and control system, the metering and acquisition terminal is tested in a realistic usage environment, restoring the on-site complexity of the power grid system. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 This is a schematic diagram of a simulated power grid field testing platform according to the present invention;

[0016] Figure 2 This is a schematic diagram of a power grid test and control system.

[0017] Figure label:

[0018] 1-Power grid operating condition simulation system, 11-Power line, 111-Main power line, 112-Branch power line, 12-Meter, 13-Signal generator, 14-Relay, 15-Attenuator, 16-Power grid load component, 161-Three-phase load instrument, 162-Motor, 163-Photovoltaic power generation equipment, 17-Environmental control component, 171-Temperature and humidity sensor, 18-Three-phase power supply;

[0019] 2-Power grid test and control system, 21-Host computer, 22-CCO master node, 23-STA slave node. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] Please see Figure 1 and Figure 2 A simulated power grid field test platform is disclosed, comprising a power grid test control system 2 and a power grid operating condition simulation system 1 installed in an environmental chamber. The power grid test control system 2 controls the power grid operating condition simulation system 1. The power grid operating condition simulation system 1 includes a power grid circuit and a signal generator 13, a relay 14, an attenuator 15, and a power grid load component 16 connected to the power grid circuit. The signal generator 13 injects interference signals into the power grid circuit. The attenuator 15 is electrically connected between the power grid test control system 2 and the power grid circuit, and is used to attenuate signals in the power grid circuit. The relay 14 is used to connect or disconnect the power grid circuit. The power grid load component 16 is used to simulate the load of the power grid circuit. Specifically, the environmental chamber is a sealed chamber, and an insulation layer covers the inner wall of the environmental chamber. The attenuator 15 is connected to the power grid circuit to simulate the power supply network topology and simulate the actual power grid environment. The signal generator 13 injects pre-recorded interference waveforms (including white noise, impulse noise, and narrowband noise) through a coupler to simulate the real power line environment. The power grid load component 16 is used to simulate the power grid communication environment under different load conditions, while the relay 14 is used to simulate the power grid on / off conditions and simulate power outage and power restoration scenarios.

[0022] The power grid test control system 2 is responsible for task assignment, monitoring the test process, receiving test logs, and analyzing test results. The power grid test control system 2 is connected to the power grid circuit, signal generator 13, relay 14, and power grid load component 16 via Wi-Fi or wires.

[0023] This utility model discloses a simulated power grid field testing platform. In use, a test environment consisting of a power grid operating condition simulation system 1 is first set up. Power grid circuits, signal generators 13, power grid load components 16, relays 14, attenuators 15, and other equipment are connected and configured according to requirements to ensure the ability to simulate various low-voltage distribution area types and complex power environments. Then, a power grid test control system 2 is configured to ensure that it has functions such as executing test tasks, monitoring the test process, analyzing results, and sending emails. During evaluation, the user issues test commands through the power grid test control system 2. The power grid operating condition simulation system 1 simulates various test scenarios under actual operating conditions according to the set test tasks, such as different attenuation, noise, load, power outages and restorations, and combines these scenarios under different temperature and humidity conditions to recreate the complex field conditions of the power grid system. The power grid operating condition simulation system 1 performs corresponding operations and data acquisition according to the commands. The generated data is received and processed by the power grid test control system 2, including log monitoring and result analysis report generation. Finally, the test results are sent to relevant personnel via email for a comprehensive evaluation of the test platform's performance, stability, and reliability.

[0024] Through the above implementation methods, various tests can be conducted using a simulated power grid field testing platform. This reduces the need for manual intervention, improves testing efficiency and accuracy, and enables comprehensive and continuous evaluation of data acquisition equipment performance. It effectively facilitates the early identification of equipment quality issues, comprehensively improves the product quality of data acquisition equipment, and provides a guarantee for the long-term stable and reliable operation of the system. Automated testing offers advantages such as accurate environmental replication, high fault reproducibility, and comprehensive business coverage. It can conduct multi-dimensional technical experiments in all aspects, ensuring that the stability performance of the product is fully verified under various extreme and complex conditions, providing rich and accurate data support for in-depth analysis of product performance and stability.

[0025] Furthermore, the power grid circuit includes several meters 12 and power lines 11; the power lines 11 include a main power line 111 and branch power lines 112 connected to the main power line 111; the main power line 111 is connected to the power grid test and control system 2, the signal generator 13 and the power grid load component 16 are connected to the main power line 111, and the meters 12 and relays 14 are installed in the branch power lines 112. Specifically, the main power line 111 includes three-phase lines and signal lines 113, the three-phase lines are connected to a three-phase power supply 18, and the three-phase power supply 18 provides power to the test platform. The branch power lines 112 are connected in parallel, and the platform is also equipped with a meter rack, in which the meters 12 are detachably installed, and the attenuator 15 is connected to the meters 12 through the power lines 11. Preferably, the meter 12 is a meter that supports the DLT645 and DLT698.45 protocols, and the serial port baud rate is adaptive to both meter 12 protocols. The meter 12 is installed in the meter slot of the meter rack, and the meters 12 are connected in parallel.

[0026] Furthermore, the grid load component 16 includes any one or a combination of a three-phase load cell 161, a motor 162, and a photovoltaic power generation device 163; the motor 162 and the three-phase load cell 161 are connected to the grid circuit, and the photovoltaic power generation device 163 is installed on the outdoor roof of the environmental chamber, with its output terminal connected to the grid circuit. Specifically, the three-phase load cell 161 simulates the communication of the platform under various electrical load conditions. Preferably, the three-phase load cell 161 is an RLC programmable AC load, specifically the ACL-RLC60S manufactured by Geely Electronics (Suzhou) Co., Ltd.; the photovoltaic power generation device 163 is connected to the power line 11 through a photovoltaic inverter to simulate the impact of photovoltaic power generation on the grid environment; the motor simulates the inductive load on site, and the motor 162 is a three-phase motor. In this application, the three-phase load cell 161, the motor 162, and the photovoltaic power generation device 163 are used in combination and are activated according to different grid load simulation conditions in the test task.

[0027] Furthermore, the power grid test and control system 2 includes a host computer 21, a CCO master node 22, and STA slave nodes 23. The host computer 21 is connected to the CCO master node 22 via a USB-to-RS232 serial cable, and the STA slave nodes 23 are connected to the CCO master node 22. Each meter 12 is equipped with one STA slave node 23. Specifically, the CCO (Central Coordinating Node) master node 22 is used to receive test messages sent by the host computer 21 via the USB-to-RS232 serial cable. The CCO master node 22 sends signals to the main power line 111 through its own coupling circuit according to the test messages, and then issues instructions to the environmental conditioning component 17, signal generator 13, relay 14, or power grid load component 16 according to the test task, and sends instructions to the meter 12 through the STA (Station) slave nodes 23.

[0028] Furthermore, the CCO master node 22 incorporates an HPLC communication module. Specifically, the HPLC communication module (High-speed Power Line Communications) features high communication speed, stable signal, and a high level of automation.

[0029] Furthermore, a temperature and humidity sensor 171 is also provided and installed in the indoor environment. Specifically, the temperature and humidity sensor 114 is connected to the power grid test and control system 2 to monitor the platform's environmental conditions and feed back the collected data to the power grid test and control system 2.

[0030] Furthermore, the environmental chamber is equipped with an environmental control component 17, which is an integrated temperature and humidity control air conditioner. Specifically, the integrated temperature and humidity control air conditioner can be used to control the ambient temperature of the test environment, simulating different temperatures, including both heating and cooling functions; it can also be used to control the ambient humidity, including both dehumidification and humidification functions, switching operating modes according to the actual application scenario. The environmental control component 17 can also be used in conjunction with devices that separately control ambient temperature and devices that separately control ambient humidity. The drain pipe of the environmental control component 17 passes through the wall of the environmental chamber, and the hole in the wall is sealed with sealant to ensure the airtightness of the environmental chamber. The environmental control component 17 is used to simulate the test platform under different temperature and humidity environments, simulating the application of power grid circuits in an outdoor environment.

[0031] Using the simulated power grid field test platform of this utility model, firstly, a simulated power grid field operating condition system is built; the power grid test control system 2 is connected to the power grid operating condition simulation system 1; then, different simulated power grid field operating conditions in the test task are preset, including environmental conditions, power grid load conditions, noise environment conditions, and circuit attenuation conditions; according to the requirements of the test task, the power grid test control system 2 selectively activates the meter 12, relay 14, and environmental adjustment component 17; selectively activates or adjusts the signal generator 13 and power grid load component 16 to meet the preset simulated power grid field operating condition requirements; finally, the platform's operating status information and the data from the field sensors during the test are uploaded to the power grid test control system 2 and synchronously stored in the historical database.

[0032] Specifically, the test tasks include: reading various data information stored in the electricity meter, reading daily frozen data, CCO master node testing, routing meter reading testing, phase identification testing, power outage and restoration active reporting testing, and protocol consistency testing. The main test steps of the above test content are existing technologies, such as application number CN113746501A, entitled "A Simulation Device System and Test Method for Evaluating the Deepening Function of HPLC".

[0033] Daily frozen data reading test: Set the platform freeze time (e.g., 24:00 every day), and read the data after the freeze is triggered; verify that the difference between the frozen power and the real-time power is ≤0.1KWh, and the time synchronization error is ≤1 minute.

[0034] The node actively tests to verify whether it automatically sends a registration message (10H command) to the concentrator; after receiving the registration frame, the CCO master node 22 resolves the address and updates the network topology; the CCO master node 22 compares the results after half an hour and checks whether the result is successful.

[0035] The routing meter reading test verifies that the success rate of cross-node meter reading is 100% and the response latency is ≤100ms.

[0036] Phase recognition test: When switching between phases 12A, B, and C of the smart meter, the module should correctly identify and report the phase information, such as ABC, ACB, etc.

[0037] The transformer area identification test involves sending a transformer area identification command (05HF6 instruction) through a simulated concentrator to determine whether the transformer area attribution information is incorrect.

[0038] The power outage and restoration active reporting test disconnects relay 14 and waits for the platform to actively report the power outage event (06HF5). After power is restored, the power grid test control system 2 receives the power restoration message. During the power outage and restoration test, the time from power outage to power restoration should be greater than one minute.

[0039] Protocol conformance test, 376.2 Protocol application layer function code AFN transmission test, to verify whether the platform function code meets the requirements.

[0040] During the above tests, the power grid operating condition simulation settings were as follows:

[0041] A1. Environmental control component 17 regulates temperature and humidity. During the test, the daytime (8:00-18:00) temperature is 40 degrees Celsius and the humidity is 75%, while the nighttime (20:00-6:00) temperature is 10 degrees Celsius and the humidity is 35%. Using this temperature and humidity, the test platform operates in a simulated high-temperature and high-humidity environment or a low-temperature and dry environment. The switching time between 18:00-20:00 and 6:00-8:00 is the operating condition switching time.

[0042] A2. The attenuation value of attenuator 15 is set to 60dB to simulate the signal attenuation environment of power line 11;

[0043] A3. Signal generator 13 pulse interference: pulses with a duty cycle of <5% in the range of 100KHz to 200KHz; narrowband interference: narrowband signals in the range of 1MHz, 3MHz, or 6MHz; and previously recorded typical interference noises affecting carrier communication, such as white noise, pulse noise, and narrowband noise, which are alternately coupled into the environment by one signal generator 13 or injected into the platform by multiple signal generators 13 at the same time.

[0044] A4. If motor 162 is used to simulate the load on the power grid, motor 162 will continuously operate under no-load conditions. In this application, the power of motor 162 is 5kW. If a three-phase load cell 161 is used to simulate the load on the power grid, it will operate under a heavy load of 30kW during the test period from 6:00-8:00, 11:00-13:00, and 19:00-21:00, and at other times it will operate at 5kW. If photovoltaic power generation equipment 163 is randomly injected into the test platform, actual analysis will be performed using the inverter's IU curve.

[0045] This utility model discloses a simulated power grid field testing platform. With pre-configured equipment including an environmental conditioning component 17, a three-phase power supply 18, 12-node meters, a signal generator 13, a power grid load component 16, relays 14, and attenuators 15, it can accurately simulate complex transformer substation environments and communication environments, including factors such as attenuation, noise, load, topology, and number of users, as well as key environmental factors such as the access of new energy equipment like photovoltaics. The testing process is automated, significantly reducing manual intervention and improving testing efficiency and accuracy. It provides a comprehensive and continuous evaluation of the stability, reliability, and performance of the platform equipment, establishing a complete platform equipment evaluation system. This effectively addresses platform equipment quality issues proactively, reduces on-site maintenance workload, lowers the failure rate of metering and data acquisition terminals, and ensures long-term stable system operation.

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A platform for analog grid field testing, characterized in that, include: The system includes a power grid test control system (2) and a power grid operating condition simulation system (1) located in an environmental room. The power grid test control system (2) controls the power grid operating condition simulation system (1). The power grid operating condition simulation system (1) includes a power grid circuit and a signal generator (13), a relay (14), an attenuator (15), and a power grid load component (16) connected to the power grid circuit. The signal generator (13) injects interference signals into the power grid circuit. The attenuator (15) is electrically connected between the power grid test control system (2) and the power grid circuit. The attenuator (15) is used to attenuate the signals in the power grid circuit. The relay (14) is used to connect or disconnect the power grid circuit. The power grid load component (16) is used to simulate the load of the power grid circuit.

2. The analog power grid field test platform of claim 1, wherein, The power grid circuit includes several meters (12) and power lines (11); the power lines (11) include a main power line (111) and branch power lines (112) connected to the main power line (111); the main power line (111) is connected to the power grid test and control system (2), the signal generator (13) and the power grid load components (16) are connected to the main power line (111), and the meters (12) and relays (14) are installed in the branch power lines (112).

3. The analog power grid field test platform of claim 1 or 2, wherein, The grid load component (16) includes any one or a combination of a three-phase load cell (161), a motor (162), and a photovoltaic power generation device (163); the motor (162) and the three-phase load cell (161) are connected to the grid circuit, and the photovoltaic power generation device (163) is installed on the outdoor roof of the environmental room, and its output terminal is connected to the grid circuit.

4. The analog power grid field test platform of claim 2, wherein, The power grid test and control system (2) includes a host computer (21), a CCO master node (22) and a STA slave node (23). The host computer (21) is connected to the CCO master node (22) via a USB to RS232 serial cable. The STA slave nodes (23) are connected to the CCO master node (22) respectively. Each meter (12) is equipped with a STA slave node (23).

5. The analog power grid field test platform of claim 4, wherein, The CCO master node (22) has a built-in HPLC communication module.

6. The analog power grid field test platform of claim 1, 2, 4, or 5, wherein, It also includes a temperature and humidity sensor (171) installed in the ambient room.

7. The analog power grid field test platform of claim 3, wherein, It also includes a temperature and humidity sensor (171) installed in the ambient room.

8. The analog power grid field test platform of claim 1, 2, 4, 5, or 7, wherein, The environmental room is equipped with an environmental control component (17), which is an integrated air conditioner with constant temperature and humidity.

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