Portable low-voltage master switch remote control synchronous grid-connected system

Abstract

The application relates to a portable low-voltage general switch remote control synchronous grid-connected system. The portable low-voltage general switch remote control synchronous grid-connected system comprises a grid-connected power generation device, a closing remote control mechanism and a sampling line clamp; the grid-connected power generation device is electrically connected with a load and the closing remote control mechanism respectively; the sampling line clamp is electrically connected with a power grid and the closing remote control mechanism respectively; the sampling line clamp is used for collecting a first electrical parameter of the power grid and transmitting the first electrical parameter to the grid-connected power generation device through the closing remote control mechanism; the grid-connected power generation device is used for providing electric energy to the load after being connected with the power grid; and according to a second electrical parameter of the grid-connected power generation device and the first electrical parameter, a closing control instruction is output to the closing remote control mechanism in the case that the power grid and the grid-connected power generation device satisfy synchronous conditions; and the closing remote control mechanism is used for driving a commercial power switch to perform a closing operation according to the closing control instruction. The application can improve power supply stability.

Description

Technical Field

[0001] This application relates to the field of power grid connection technology, and in particular to a portable low-voltage main switch remote control synchronous grid connection system. Background Technology

[0002] With the continuous progress of modern society, electricity supply has become deeply integrated into people's production activities and daily lives, and users' requirements for the stability and continuity of power supply systems are also increasing. As key equipment in the power system, the stable operation of low-voltage distribution cabinets, transformers, and other devices is the foundation for ensuring normal power supply for users. To ensure the long-term stable operation of these devices, regular maintenance and repair have become one of the core tasks of power operation and maintenance.

[0003] During equipment maintenance, it is usually necessary to switch the power supply mode from mains power to backup power. However, existing power switching technologies still have certain limitations: power outages are prone to occur during the switching process, and this problem often recurs during multiple maintenance operations. Although the timing and frequency of power outages may vary depending on the type of equipment and the operating environment, any form of power outage directly affects users' electricity consumption and, consequently, the stability of the power supply system. Utility Model Content

[0004] Therefore, it is necessary to provide a portable low-voltage main switch remote control synchronous grid connection system that can improve the power supply stability of the power supply system, addressing the aforementioned technical problems.

[0005] In a first aspect, this application provides a portable low-voltage main switch remote control synchronous grid connection system, which includes grid-connected power generation equipment, a closing remote control mechanism, and sampling clamps; the grid-connected power generation equipment is electrically connected to the load and the closing remote control mechanism respectively; the sampling clamps are electrically connected to the power grid and the closing remote control mechanism respectively.

[0006] The sampling clamp is used to collect the first electrical parameters of the power grid and transmit the first electrical parameters to the grid-connected power generation equipment through the closing remote control mechanism;

[0007] Grid-connected power generation equipment is used to provide electrical energy to loads after being connected to the power grid; and to output a closing control command to the closing remote control mechanism when it is determined that the power grid and the grid-connected power generation equipment meet the synchronization conditions based on the second electrical parameters and the first electrical parameters of the grid-connected power generation equipment.

[0008] The remote control mechanism for closing is used to drive the mains switch to perform the closing operation according to the closing control command, so as to realize the quasi-synchronous grid connection operation between the grid-connected power generation equipment and the power grid.

[0009] Secondly, this application also provides a grid connection method applied to grid-connected power generation equipment, the method comprising:

[0010] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0011] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0012] Thirdly, this application also provides a grid connection device, which includes:

[0013] The acquisition module is used to acquire the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0014] The determining module is used to determine, based on the second electrical parameters and the first electrical parameters, that the power grid and the grid-connected power generation equipment meet the synchronization conditions, and then output a closing control command to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0015] Fourthly, this application also provides a grid-connected power generation device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0016] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0017] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0018] Fifthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0019] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0020] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0021] Sixthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0022] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0023] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0024] The aforementioned portable low-voltage main switch remote control synchronous grid-connection system firstly collects the first electrical parameters of the power grid in real time through sampling clamps and accurately compares them with the second electrical parameters of the grid-connected power generation equipment to determine whether the power grid and the grid-connected power generation equipment meet the preset synchronization conditions. This effectively avoids grid fluctuations, voltage drops, or frequency deviations caused by inconsistent electrical parameters, greatly reducing the risk of power disturbances during grid connection and thus ensuring the overall stability of the power supply system. Secondly, the quasi-synchronous grid connection control strategy achieves automatic closing of the mains switch through a remote closing mechanism, enabling rapid and smooth connection of the power generation equipment to the grid, avoiding timing errors or delays that may occur in traditional manual closing. This rapid response mechanism reduces grid load fluctuations and mitigates transient impacts caused by switching operations, helping to maintain the smooth and continuous operation of the power grid. Furthermore, during the quasi-synchronous grid connection process, the system ensures dynamic coordination between the power generation equipment and the grid, avoiding problems such as harmonics, current surges, and equipment overload caused by asynchronous grid connection. This not only protects the safe operation of power equipment but also avoids power outages caused by degraded power quality, further improving the reliability of power supply. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in one embodiment;

[0027] Figure 2 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0028] Figure 3 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0029] Figure 4 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0030] Figure 5 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0031] Figure 6 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0032] Figure 7 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0033] Figure 8 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0034] Figure 9 This is a schematic diagram of a portable low-voltage main switch remote control synchronous grid-connected system in another embodiment;

[0035] Figure 10 This is a flowchart illustrating a grid connection method in one embodiment;

[0036] Figure 11 This is a flowchart illustrating the grid connection method in another embodiment;

[0037] Figure 12 This is a structural block diagram of a grid-connected device in one embodiment;

[0038] Figure 13 This is an internal structural diagram of a grid-connected power generation device in one embodiment;

[0039] Explanation of reference numerals in the attached figures:

[0040] 01: Grid-connected power generation equipment; 02: Remote control mechanism for closing; 03: Sampling clamp;

[0041] 04: Power grid; 05: Load; 06: Mains switch; 07: Busbar clamp;

[0042] 011: Quasi-synchronous grid-connected module; 012: Power generation equipment;

[0043] 0121: Generator; 0122: Generator switch. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] With the continuous development of modern society and the constant improvement of technology, electric energy, as a fundamental resource supporting social operation, plays an irreplaceable and vital role in many fields such as industrial production, commercial activities, and residential life. To meet the ever-increasing electricity demand from users, the power system has placed higher technical requirements on power quality, stability, and continuity. Especially in critical scenarios such as hospitals, communication hubs, data centers, and industrial manufacturing lines, the stability of the power supply is extremely crucial, and any form of power outage can lead to serious consequences.

[0046] In the basic architecture of a power system, low-voltage switchgear, transformers, busbar systems, and other equipment serve as critical nodes, and their operational status directly affects the safety and reliability of the entire power supply system. To ensure the long-term stable operation of these devices and prevent equipment failures due to aging, wear, or environmental factors, power maintenance personnel typically perform regular maintenance and repairs. Equipment maintenance has become a core component of the power operation and maintenance system, and its frequency, quality, and operational efficiency directly impact the overall stability of the power supply system.

[0047] During equipment maintenance, to ensure operational safety and isolate fault risks, it is usually necessary to temporarily disconnect the original mains power supply to the equipment and switch the system power to a backup power supply or emergency power generation system to maintain the basic power supply needs of the load side. However, existing power switching technologies still have many limitations. Specifically:

[0048] The switching process may experience momentary interruptions: During the switching from mains power to backup power, power outages of milliseconds to seconds may occur due to reasons such as delayed response of the switching mechanism, asynchronous control logic, or power matching errors. Although such interruptions are brief, they may cause adverse effects such as data loss or system restarts for some power-sensitive equipment (such as computer servers, medical instruments, etc.).

[0049] Problems recurring during power switching: Due to the periodic nature of regular maintenance of power supply equipment, power switching operations are often repeated within a short period of time. However, existing switching systems are prone to problems such as contact wear, electrical shocks, and synchronization abnormalities during repeated operation, which further affects the long-term reliability of the system.

[0050] Lack of adaptability to different scenarios: Existing switching devices are mostly standardized designs, making it difficult to automatically adjust switching strategies according to specific application scenarios (such as equipment type, load level, grid connection status, etc.), resulting in poor adaptability and insufficient operational flexibility.

[0051] Therefore, how to achieve a power switching control technology that can improve power switching stability, shorten switching time, avoid interruption risks, and has multi-scenario adaptability has become a technical problem that urgently needs to be solved in this field.

[0052] Based on this, embodiments of this application provide a portable low-voltage main switch remote control synchronous grid connection system, such as... Figure 1 As shown, the system includes a grid-connected power generation device 01, a remote closing control mechanism 02, and a sampling clamp 03. The grid-connected power generation device 01 is electrically connected to the load 05 and the remote closing control mechanism 02. The sampling clamp 03 is electrically connected to the power grid 04 and the remote closing control mechanism 02. The sampling clamp 03 is used to collect the first electrical parameters of the power grid 04 and transmit the first electrical parameters to the grid-connected power generation device 01 through the remote closing control mechanism 02. The grid-connected power generation device 01 is used to provide power to the load 05 after being connected to the power grid 04. Based on the second electrical parameters and the first electrical parameters of the grid-connected power generation device 01, if the power grid 04 and the grid-connected power generation device 01 meet the synchronization conditions, the system outputs a closing control command to the remote closing control mechanism 02. The remote closing control mechanism 02 is used to drive the mains switch 06 to perform a closing operation according to the closing control command, so as to realize the quasi-synchronous grid connection operation between the grid-connected power generation device 01 and the power grid 04.

[0053] The grid-connected power generation equipment 01 is electrically connected to the load 05 and the remote control mechanism 02, respectively, and is used to provide power to the load 05 after the grid connection operation is completed;

[0054] The sampling clamp 03 is electrically connected to the power grid 04 and the remote control mechanism 02 respectively, and is used to obtain the first electrical parameters on the power grid 04 side, and transmit the first electrical parameters to the grid-connected power generation equipment 01 through the remote control mechanism 02.

[0055] The grid-connected power generation equipment 01 includes an electrical parameter acquisition unit for monitoring its own operating status, capable of acquiring a second electrical parameter in real time. The first and second electrical parameters together serve as the basis for determining quasi-synchronization.

[0056] The closing remote control mechanism 02 is a control execution device with remote receiving and driving capabilities. On the one hand, it receives and forwards the first electrical parameters from the sampling clamp 03 to the grid-connected power generation equipment 01. On the other hand, it receives and executes the closing control command from the grid-connected power generation equipment 01, and drives the mains switch 06 to realize the closing operation based on the command.

[0057] In actual operation, the portable low-voltage main switch remote control synchronization grid-connected system first collects the current first electrical parameters of the power grid 04 through sampling clamp 03, and transmits them to the grid-connected power generation equipment 01 through the closing remote control mechanism 02. After obtaining these parameters, the grid-connected power generation equipment 01 compares and analyzes them with the second electrical parameters it has collected. When the comparison results show that the two sets of parameters meet the preset quasi-synchronization conditions in terms of voltage amplitude difference, frequency difference, and phase angle difference, the grid connection condition is established.

[0058] At this time, the grid-connected power generation equipment 01 outputs a closing control command to the closing remote control mechanism 02. After receiving the command, the closing remote control mechanism 02 controls the mains switch 06 to perform the closing action, thereby realizing the quasi-synchronous grid connection between the grid-connected power generation equipment 01 and the power grid 04.

[0059] In the above embodiments, firstly, the first electrical parameters of the power grid are collected in real time through sampling clamps and accurately compared with the second electrical parameters of the grid-connected power generation equipment to determine whether the power grid and the grid-connected power generation equipment meet the preset synchronization conditions. This effectively avoids grid fluctuations, voltage drops, or frequency deviations caused by inconsistent electrical parameters, greatly reducing the risk of power disturbances during grid connection and thus ensuring the overall stability of the power supply system. Secondly, the quasi-synchronous grid connection control strategy realizes the automatic closing operation of the mains switch through the remote closing mechanism, which can quickly and smoothly connect the power generation equipment to the grid, avoiding timing errors or delays that may occur in traditional manual closing. This rapid response mechanism reduces grid load fluctuations and reduces transient impacts caused by switching operations, helping to maintain the smooth and continuous operation of the power grid. In addition, during the process of achieving quasi-synchronous grid connection, the system can ensure the dynamic coordination between the power generation equipment and the power grid, avoiding problems such as harmonics, current surges, and equipment overload caused by asynchronous grid connection. This not only protects the safe operation of power equipment but also avoids power outages caused by power quality degradation, further improving the reliability of power supply.

[0060] This application provides a portable low-voltage main switch remote control synchronous grid connection system, such as... Figure 2As shown, the grid-connected power generation equipment 01 includes a power generation device 012 and a quasi-synchronous grid connection module 011. The power generation device 012 and the quasi-synchronous grid connection module 011 interact with each other through an internal communication line. The quasi-synchronous grid connection module 011 is used to acquire the first electrical parameters and the second electrical parameters of the power generation device 012, and output adjustment commands based on the first and second electrical parameters. The power generation device 012 is used to adjust the parameters according to the adjustment commands. The sampling clamp 03 is also used to acquire the adjusted second electrical parameters and send the adjusted second electrical parameters to the power generation device 012 through the quasi-synchronous grid connection module 011. The power generation device 012 is also used to output a closing control command to the closing remote control mechanism 02 when it is determined that the grid 04 and the grid-connected power generation equipment 01 meet the synchronization conditions based on the adjusted second electrical parameters and the first electrical parameters, and to supply power to the load 05 in the grid-connected state.

[0061] The quasi-synchronous grid connection module 011 receives the first electrical parameters acquired by the sampling clamp 03 and simultaneously acquires the second electrical parameters output by the power generation equipment 012 during operation. The quasi-synchronous grid connection module 011 determines the current grid connection status based on the difference between the two parameters and generates a corresponding adjustment command. This adjustment command instructs the power generation equipment 012 to fine-tune its output parameters to approximate the grid parameters 04, thereby achieving consistency in electrical characteristics.

[0062] After receiving the regulation command, the power generation equipment 012 adjusts its internal control parameters, such as adjusting the output control strategy of the excitation system or inverter, to change the characteristics of the output voltage amplitude, frequency or phase angle, until its output second electrical parameters gradually approach the target synchronous state.

[0063] Based on this, the sampling clamp 03 is further used to collect the adjusted second electrical parameters and feed them back to the quasi-synchronous grid connection module 011. The quasi-synchronous grid connection module 011 determines whether the adjustment effect has reached the set quasi-synchronous conditions based on the feedback information. If the conditions are met (e.g., voltage difference does not exceed the allowable deviation, frequency difference is less than the specified threshold, and phase angle error is controlled within the synchronization range), the generator equipment 012 is notified to output a closing control command.

[0064] After generating the closing control command, the power generation equipment 012 sends the control command through the data channel with the closing remote control mechanism 02. The closing remote control mechanism 02 then drives the mains switch 06 to close, completing the quasi-synchronous grid connection operation.

[0065] At this point, the power generation equipment 012 officially entered the grid-connected state and provided stable power to the load 05, achieving a smooth integration between the power generation side and the power grid 04.

[0066] In the above embodiments, by constructing a closed-loop parameter adjustment mechanism and feedback path, the accuracy and safety of grid connection control are improved while ensuring the consistency of grid parameters, effectively reducing the grid connection failure rate or electrical shock problem caused by parameter mismatch in traditional methods.

[0067] This application provides a portable low-voltage main switch remote control synchronous grid connection system, such as... Figure 3 As shown, the power generation equipment 012 includes a generator 0121 and a power generation switch 0122 configured at the output end of the generator 0121; the quasi-synchronous grid connection module 011 is also used to control the power generation switch 0122 to turn on after the mains switch 06 is turned off, so as to realize the quasi-synchronous grid connection between the power generation equipment 012 and the power grid 04.

[0068] Among them, generator 0121 is the main power output device, responsible for converting mechanical energy into electrical energy; generator switch 0122 is set at the output end of generator 0121 and is used to control the electrical connection status between generator 0121 and other parts of the system.

[0069] The quasi-synchronous grid connection module 011 has the function of monitoring the status of the mains switch 06. When the mains switch 06 is detected to be open, the quasi-synchronous grid connection module 011 automatically sends a control signal to drive the generator switch 0122 to turn on. By controlling the closing of the generator switch 0122, the electrical connection between the generator 0121 and the load 05 is realized, providing hardware guarantee for quasi-synchronous grid connection.

[0070] In the above embodiments, the generator switch enables rapid and safe connection to the system, achieving near-synchronous grid connection with the power grid. This method effectively reduces power fluctuations and voltage surges caused by electrical parameter mismatches during switching, improving grid connection stability and security.

[0071] This application provides a portable low-voltage main switch remote control synchronous grid connection system, such as... Figure 4 As shown, the portable low-voltage main switch remote control synchronous grid-connected system also includes a bus clamp 07, and the grid-connected power generation equipment 01 is connected to the load 05 and the mains switch 06 respectively through the bus clamp 07.

[0072] This application provides a portable low-voltage main switch remote control synchronous grid connection system, such as... Figure 5As shown, this portable low-voltage main switch remote control synchronization grid connection system includes power generation equipment (taking a generator truck as an example, including a generator and generator truck switch), a low-voltage switch closing remote control operating mechanism, a quasi-synchronous grid connection module, a small sampling clamp, a bus clamp, and auxiliary equipment such as an AC power supply, a 10kV switch, a transformer, and a mains switch. The power generation equipment's output cable can supply power to the load and is electrically connected to the low-voltage switch closing remote control operating mechanism to transmit power and commands. Its quasi-synchronous grid connection module can be built-in or separate. The low-voltage switch closing remote control operating mechanism receives commands and executes the mains switch closing. The quasi-synchronous grid connection module collects grid electrical parameters through the small sampling clamp, obtains power generation equipment parameters via RS-485, determines grid connection conditions, and then issues a closing command. The small sampling clamp is installed on the grid side to collect parameters. The bus clamp connects the power generation equipment, the mains switch, and the load. The auxiliary equipment constitutes the grid-side power supply path, forming a power supply switching link.

[0073] The system implements the secondary grid connection and power supply switching process for power generation equipment as follows:

[0074] First, the quasi-synchronous grid-connection module uses a small sampling clamp to collect the first electrical parameters of the power grid side, and obtains the second electrical parameters of the generator equipment via RS-485. After comparison and analysis, if the parameters meet the synchronization conditions (such as voltage amplitude difference, frequency difference, and phase angle difference within the corresponding thresholds), a synchronization signal is sent to the generator equipment. If the conditions are not met, the generator equipment adjusts the parameters according to the command. Next, after receiving the synchronization signal, the generator equipment sends a closing command to the low-voltage switch closing remote control operating mechanism via RS-485. Then, the mechanism receives the command and drives the mains switch to close, connecting the generator equipment and the power grid to complete the grid connection. Finally, after grid connection, the generator equipment gradually reduces its output power, the load power supply smoothly switches to the grid, and finally the generator equipment power drops to 0, achieving a seamless power supply transition.

[0075] By automating the quasi-synchronous grid connection and power supply switching process, this system avoids human error, eliminates the risk of power outages during power conversion, ensures continuous and stable power supply for users, and is suitable for high-reliability power supply scenarios. On the other hand, it simplifies the operation process, replaces traditional manual operation, improves grid connection efficiency and safety, and protects power generation and grid equipment through smooth power transition, extends equipment life, and provides reliable technical support for power operation and maintenance and user power supply.

[0076] This application provides a grid-connected system, such as... Figure 6As shown, the grid-connected system consists of power generation equipment (taking a generator vehicle integrating a generator, generator vehicle switch, and quasi-synchronous grid-connection module as an example), a low-voltage switch closing remote control operating mechanism (i.e., a remote operating mechanism for low-voltage switch closing), small sampling clamps, bus clamps, and auxiliary equipment such as AC power supply, 10kV switch, transformer, and mains switch. The generator vehicle, as the core power generation unit, utilizes its built-in quasi-synchronous grid-connection module, connected to the bus clamp via an output cable, to supply power to the load. Simultaneously, it establishes an electrical connection with the low-voltage switch closing remote control operating mechanism, achieving power transmission and command interaction. No additional external quasi-synchronous equipment is required; this integrated design improves system portability and control efficiency.

[0077] A small sampling clamp is installed on the grid side to collect electrical parameters such as voltage, frequency, and phase angle of the grid in real time and transmit them to the quasi-synchronous grid connection module built into the generator vehicle, providing basic data for determining synchronization. The bus clamp connects the generator vehicle output, the mains switch, and the load, serving as the physical hub for power transmission and ensuring the path for power delivery from the generator vehicle and the grid side to the load.

[0078] After being converted by a 10kV switch and transformer, the AC power supply forms a grid-side power supply path adapted to the load. The mains switch serves as the connection node between the grid and the load, and together with the remote control mechanism, it realizes automated on / off control of the power supply path, jointly constructing a dual-power supply switching link between the mains and the generator vehicle. During operation, the generator vehicle's built-in quasi-synchronous grid connection module acquires grid parameters through a small sampling clamp. Combined with its own output parameters fed back through the generator vehicle's switch and bus clamp, it determines in real time whether the voltage amplitude, frequency difference, and phase angle difference meet the synchronization conditions. Once the conditions are met, it sends a command to the low-voltage switch closing remote control mechanism to drive the mains switch to close, completing the quasi-synchronous grid connection between the generator vehicle and the grid, and realizing power supply switching in emergency or maintenance scenarios.

[0079] It should be noted that, Figure 5 and Figure 6 The AC power supply, 10kV switch and transformer in the present application are the power grid in the embodiment of the present application, and the low-voltage switch closing remote control operation mechanism is the closing remote control mechanism in the embodiment of the present application.

[0080] In practical application environments, such as Figure 7 As shown, in real-world power supply scenarios, when facing situations requiring emergency power supply such as equipment maintenance or mains power failures, this emergency power vehicle's portable low-voltage main switch remote control synchronization grid connection system relies on an architecture... Figure 7 The device shown achieves reliable power supply switching according to the following procedure:

[0081] I. Equipment Deployment and Connection Adaptation

[0082] As a mobile power supply unit, the emergency power vehicle, upon arrival at the site, quickly connects to the main circuit via a generator truck output line connecting to a set of three fuses. Power from the grid side undergoes voltage conversion via a transformer (e.g., 10kV reduced to 0.4kV to adapt to low-voltage loads). A single set of small sampling clamps (≤63A) is precisely clamped onto the transformer output line (to collect electrical parameters after grid-side conversion). The emergency power vehicle interacts with the quasi-synchronous grid connection platform and the remote operation mechanism for closing the low-voltage switch via a 485 communication link. The quasi-synchronous grid connection platform uses this link to establish an information channel with the sampling clamps, the emergency power vehicle, and the operation mechanism, forming a closed loop of "monitoring-control-execution." The load end connects to the power supply link via a bus clamp and a 0.4kV low-voltage switch.

[0083] II. Simultaneous Grid Connection Execution Process

[0084] (I) Parameter Acquisition and Analysis

[0085] The small sampling clamp continuously collects electrical parameters such as voltage, frequency, and phase angle from the power grid side (after the transformer) and uploads them in real time to the quasi-synchronous grid connection platform via RS-485 communication. Simultaneously, the controller inside the emergency power vehicle collects its own output parameters, such as voltage and frequency, and also transmits them to the platform. The platform compares and analyzes these multi-dimensional parameters to determine the matching degree between the emergency power vehicle's output and the grid-side parameters. The core monitoring parameters are whether the voltage amplitude difference, frequency difference, and phase angle difference are within the safe grid connection thresholds (e.g., voltage difference ≤ 5%-10% of rated voltage, frequency difference ≤ 0.2-0.5Hz, phase angle difference ≤ 10°-15°, which can be flexibly configured according to the scenario).

[0086] (II) Remote closing control

[0087] When the platform determines that the parameters meet the synchronization conditions, it immediately sends a closing command to the remote operating mechanism for closing the low-voltage switch. Upon receiving the command, the operating mechanism drives the 0.4kV low-voltage switch to connect the emergency power vehicle with the load and the power grid, enabling the emergency power vehicle to smoothly integrate into the system and replace or assist the mains power in supplying power to the load. If the parameters do not match temporarily, the platform will send adjustment commands to the emergency power vehicle, which will automatically adjust the generator excitation current, prime mover speed, etc., to dynamically adapt to the grid connection conditions until the requirements are met before performing the closing operation.

[0088] (III) Power Supply Switching and Protection

[0089] After grid connection is completed, the emergency power vehicle gradually takes over the power supply needs of the load (or connects to the mains power supply in parallel). In the case of mains power maintenance, as the emergency power vehicle provides stable power, the maintenance circuit on the mains side can be safely disconnected; after the mains power is restored, the above process is reversed (the grid side parameters are adapted and then the circuit is closed, and the emergency power vehicle is gradually decommissioned), so as to achieve a smooth switch of the load from the emergency power vehicle to the mains power, ensuring continuous power supply to the load throughout the process and avoiding the impact of power outages on production, life and business operations.

[0090] In scenarios such as factory equipment maintenance, mains power failure in commercial locations, and temporary power supply in remote areas, this system replaces the cumbersome operation and experience-based judgment of traditional manual grid connection through standardized equipment deployment, automated parameter adaptation, and remote closing control. It significantly shortens the power supply switching time, reduces the risk of power outages caused by human misjudgment and operational delays, and provides reliable emergency protection for various scenarios sensitive to power supply continuity, truly achieving efficient emergency power supply capabilities of "immediate connection and seamless switching".

[0091] In practical application environments, such as Figure 8 As shown, in real-world power supply scenarios, when faced with situations requiring emergency power supply such as equipment maintenance or mains power failures, this emergency power vehicle's quasi-synchronous grid connection system relies on its architecture. Figure 8 The device shown achieves reliable power supply switching according to the following procedure:

[0092] I. Equipment Deployment and Connection Adaptation

[0093] As a mobile power supply unit, the emergency power vehicle, upon arrival at the site, can flexibly connect to the power consumption side through its design of "connecting the generator vehicle's output line to any load location." After the grid-side power is converted by a transformer, small sampling clamps (≤63A) are precisely clamped onto the transformer's output line to collect the converted electrical parameters (voltage, frequency, phase angle, etc.). An information exchange channel is established between the emergency power vehicle, the quasi-synchronous grid-connection platform, and the remote operation mechanism for closing the low-voltage switch via a 485 communication link. The quasi-synchronous grid-connection platform, as the core control unit, can receive data from the sampling clamps, send adjustment commands to the emergency power vehicle, and issue closing commands to the operation mechanism, forming a complete "monitoring-control-execution" closed loop. The load end is connected to the power supply link via a bus clamp, and the 0.4kV low-voltage switch serves as the switching node between the grid side and the load side, working in conjunction with the remote operation mechanism to achieve automated control.

[0094] II. Simultaneous Grid Connection Execution Process

[0095] (I) Parameter Acquisition and Analysis

[0096] The small sampling clamp continuously collects electrical parameters such as voltage, frequency, and phase angle from the power grid side (after the transformer) and uploads them in real time to the quasi-synchronous grid connection platform via RS-485 communication. Simultaneously, the emergency power vehicle's internal controller collects its own output parameters, such as voltage and frequency, and also transmits them to the platform. The quasi-synchronous grid connection platform compares and analyzes these multi-dimensional parameters to determine the matching degree between the emergency power vehicle's output and the grid-side parameters. Its core monitoring focuses on whether the voltage amplitude difference, frequency difference, and phase angle difference are within safe grid connection thresholds (e.g., voltage difference ≤ 5%-10% of rated voltage, frequency difference ≤ 0.2-0.5Hz, phase angle difference ≤ 10°-15°, which can be flexibly configured according to the scenario).

[0097] (II) Remote closing control

[0098] When the quasi-synchronous grid connection platform determines that the parameters meet the synchronization conditions, it immediately sends a closing command to the remote operation mechanism for closing the low-voltage switch. After receiving the command, the operation mechanism drives the 0.4kV low-voltage switch to connect the emergency power vehicle with the load and the power grid, enabling the emergency power vehicle to smoothly connect to the system and replace or assist the mains power in supplying power to the load. If the parameters do not match temporarily, the platform will send adjustment commands to the emergency power vehicle, which will automatically adjust the generator excitation current, prime mover speed, etc., to dynamically adapt to the grid connection conditions until the requirements are met before closing the switch.

[0099] (III) Power Supply Switching and Protection

[0100] After grid connection is completed, the emergency power vehicle gradually takes over the power supply needs of the load (either independently or in parallel with the mains power). In the case of mains power maintenance, as the emergency power vehicle provides stable power, the circuit that needs maintenance on the mains side can be safely disconnected; after the mains power is restored, the above process is reversed (the grid side parameters are adapted and then the circuit is closed, and the emergency power vehicle gradually reduces its output power until it is decommissioned), so as to achieve a smooth switch of the load from the emergency power vehicle to the mains power, ensuring continuous power supply to the load throughout the process and avoiding the impact of power outages on production, life, and business operations.

[0101] In scenarios such as factory equipment maintenance, mains power failures in commercial locations, and temporary power supply in remote areas, this system, with its advantages of flexible deployment (the generator truck can connect to any load location) and automated collaborative capabilities (the entire process of sampling, judgment, adjustment, and closing is automated), replaces the cumbersome operation and experience-based judgment of traditional manual grid connection. It significantly shortens the power supply switching time, reduces the risk of power outages caused by human error and operational delays, and provides efficient emergency power supply guarantees of "immediate connection and seamless switching" for scenarios that are sensitive to power supply continuity, such as hospital operating rooms and data center computer rooms.

[0102] In practical application environments, such as Figure 9 As shown, in real-world power supply scenarios, when faced with situations requiring emergency power supply such as equipment maintenance or mains power failures, this emergency power vehicle's quasi-synchronous grid connection system relies on its architecture. Figure 9 The device shown achieves reliable power supply switching according to the following procedure:

[0103] I. Equipment Deployment and Connection Adaptation

[0104] As a mobile power supply unit, the emergency power vehicle, upon arrival at the site, can quickly establish a physical connection with the power consumer by flexibly connecting to any load location via its generator output line. After the grid-side power is converted by a transformer, a small sampling clamp (≤63A) is attached to the transformer's output line to collect real-time electrical parameters (voltage, frequency, phase angle, etc.) from the grid side. The collected parameters are transmitted to the emergency power vehicle's built-in control system via the line, while the voltage, frequency, and other parameters output by the emergency power vehicle itself are simultaneously collected by internal sensors.

[0105] The remote operation mechanism for closing the low-voltage switch is mechanically linked with the 0.4kV low-voltage switch. The emergency power vehicle and the operation mechanism establish a command interaction channel through a 485 communication link. The load end is connected to the power supply link through a bus clamp, forming a physical connection and control closed loop of "grid side - emergency power vehicle - load side".

[0106] II. Simultaneous Grid Connection Execution Process

[0107] (I) Parameter Acquisition and Analysis

[0108] The small sampling clamp continuously collects electrical parameters such as voltage, frequency, and phase angle from the power grid side (after the transformer) and uploads them in real time to the emergency power vehicle's built-in control system via RS-485 communication. Simultaneously, the emergency power vehicle's internal controller collects its own output parameters, including voltage and frequency. The control system compares and analyzes these multi-dimensional parameters to determine the matching degree between the emergency power vehicle's output and the power grid side parameters. The core monitoring parameters are whether the voltage amplitude difference, frequency difference, and phase angle difference are within safe grid connection thresholds (e.g., voltage difference ≤ 5%-10% of rated voltage, frequency difference ≤ 0.2-0.5Hz, phase angle difference ≤ 10°-15°, which can be flexibly configured according to the scenario).

[0109] (II) Remote closing control

[0110] When the emergency power vehicle's built-in control system determines that the parameters meet the synchronization conditions, it sends a closing command to the low-voltage switch closing remote operation mechanism via the 485 communication link. After receiving the command, the operation mechanism drives the 0.4kV low-voltage switch to connect the emergency power vehicle with the load and the power grid, enabling the emergency power vehicle to smoothly connect to the system and replace or assist the mains power in supplying power to the load. If the parameters do not match temporarily, the control system will send adjustment commands to the emergency power vehicle, which will automatically adjust the generator excitation current, prime mover speed, etc., to dynamically adapt to the grid connection conditions until the requirements are met before performing closing.

[0111] (III) Power Supply Switching and Protection

[0112] After grid connection is completed, the emergency power vehicle gradually takes over the power supply needs of the load (either independently or in parallel with the mains power). In the case of mains power maintenance, as the emergency power vehicle provides stable power, the circuit that needs maintenance on the mains side can be safely disconnected; after the mains power is restored, the above process is reversed (after the grid side parameters are adapted, the power vehicle control system drives the low-voltage switch to close, and the emergency power vehicle gradually reduces its output power until it is decommissioned), so as to achieve a smooth switch of the load from the emergency power vehicle to the mains power, ensuring continuous power supply to the load throughout the process and avoiding the impact of power outages on production, life, and business operations.

[0113] In scenarios such as factory equipment maintenance, mains power failures in commercial locations, and temporary power supply in remote areas, this system, with its flexible deployment advantages (the generator truck's output line can connect to any load location) and integrated control capabilities (quasi-synchronization function built into the power truck, simplifying the architecture), replaces the cumbersome operation and experience-based judgment of traditional manual grid connection, significantly shortening power supply switching time and reducing the risk of power outages caused by human error and operational delays. Especially for scenarios sensitive to power supply continuity, such as hospital operating rooms and data center server rooms, it can achieve highly efficient emergency power supply guarantee with "immediate connection and seamless switching."

[0114] In one exemplary embodiment, such as Figure 10 As shown, a grid connection method is provided, which can be applied to... Figure 1 The following explanation uses grid-connected power generation equipment as an example, including steps 501 to 502. Wherein:

[0115] Step 501: Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment.

[0116] In this embodiment, the grid-connected power generation equipment acquires a first electrical parameter of the power grid in real time via a sampling clamp. This first electrical parameter reflects the operating status of the power grid. Simultaneously, the grid-connected power generation equipment also collects its own second electrical parameter in real time. This second electrical parameter reflects the current electrical characteristics of the grid-connected power generation equipment.

[0117] Step 502: Based on the second electrical parameters and the first electrical parameters, if the grid and the grid-connected power generation equipment meet the synchronization conditions, output a closing control command to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the grid.

[0118] In this embodiment, the grid-connected power generation equipment compares and analyzes its own second electrical parameters with the first electrical parameters of the power grid to obtain a comparison result. Based on the comparison result, the grid-connected power generation equipment determines whether all the above parameters meet the preset quasi-synchronization conditions. Only when it is confirmed that the electrical parameters of the power grid and the power generation equipment meet the synchronization requirements will the power generation equipment output a closing control command to the closing remote control mechanism. After receiving the command, the closing remote control mechanism drives the mains switch to perform a closing operation, completing the physical connection between the power generation equipment and the power grid, and achieving quasi-synchronous grid connection.

[0119] In the aforementioned grid connection method, real-time monitoring and comparative analysis of the electrical characteristics of both the power grid and the grid-connected generating equipment are achieved by acquiring the first electrical parameters of the power grid and the second electrical parameters of the grid-connected generating equipment. Based on these parameters, the grid-connected generating equipment can accurately determine whether the power grid and the grid-connected generating equipment meet the preset synchronization conditions, thereby outputting a closing control command while ensuring parameter matching. Through the quasi-synchronous grid connection method, the closing remote control mechanism can accurately and timely drive the mains switch to perform the closing operation, achieving smooth connection between the generating equipment and the power grid, reducing power quality fluctuations and transient impacts during the grid connection process, and ensuring the stability and safety of the power system operation. At the same time, this method simplifies the grid connection operation process and reduces the risk of human error.

[0120] In one exemplary embodiment, such as Figure 11 As shown, the above-mentioned "outputting a closing control command to the closing remote control mechanism when the grid and grid-connected power generation equipment meet the synchronization conditions based on the second electrical parameters and the first electrical parameters" includes steps 601 to 602. Wherein:

[0121] Step 601: Determine the difference information between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference information to obtain the adjusted second electrical parameter.

[0122] In this embodiment, the grid-connected power generation equipment acquires the first electrical parameters of the power grid and the second electrical parameters of the power generation equipment through sampling clamps. The electrical parameters may include three core indicators: voltage amplitude, frequency, and phase angle. These indicators directly affect the stability and safety of the grid connection process. The grid-connected power generation equipment calculates the difference between these two sets of parameters to obtain the specific differences between each parameter, which guides the parameter adjustment of the power generation equipment.

[0123] Based on the differential information, the grid-connected power generation equipment adjusts its electrical parameters to ensure they gradually approach the corresponding parameters of the power grid, thereby meeting the synchronization requirements for grid connection. For example:

[0124] (1) Voltage amplitude regulation: When the voltage amplitude of the grid-connected power generation equipment is found to be different from the voltage amplitude of the grid, the excitation system or transformer tap of the power generation equipment is adjusted to adjust the output voltage so that the amplitude difference is controlled within the preset voltage threshold range to ensure voltage synchronization.

[0125] (2) Frequency regulation: When there is a difference between the frequency of the power generation equipment and the frequency of the power grid, the grid-connected power generation equipment changes the speed by adjusting the speed control device of the generator, so that the output frequency of the power generation equipment is close to the frequency of the power grid, maintains frequency synchronization, and avoids system oscillation or equipment damage caused by excessive frequency difference.

[0126] (3) Phase angle adjustment: The adjustment of the phase angle difference involves the phase matching of the output voltage waveform of the power generation equipment and the voltage waveform of the grid. By adjusting the generator excitation and control strategy, the grid-connected power generation equipment keeps the phase angle error of the power generation equipment within the preset range, ensuring the correctness of the current direction and power flow, and preventing power surge.

[0127] Step 602: After determining that the power grid and grid-connected power generation equipment meet the synchronization conditions based on the adjusted second electrical parameters and the first electrical parameters, output a closing control command to the closing remote control mechanism.

[0128] In this embodiment, after parameter adjustment is completed, the grid-connected power generation equipment re-detects and compares the adjusted electrical parameters to confirm that the differences in voltage, frequency, and phase angle are all within the preset allowable threshold range, thus meeting the synchronization conditions. Based on this, the grid-connected power generation equipment sends a closing control command to the remote closing mechanism, instructing the mains switch to perform the closing action, thereby achieving safe and stable quasi-synchronous grid connection between the power generation equipment and the power grid.

[0129] Through the closed-loop control of the above steps, it is possible to ensure that grid-connected power generation equipment accurately matches grid parameters during dynamic adjustment, minimize grid connection impact and power quality problems, and ensure the overall stability and operational safety of the power system.

[0130] In one specific embodiment, the first electrical parameter includes a first voltage, a first frequency, and a first phase angle; the second electrical parameter includes a second voltage, a second frequency, and a second phase angle; the synchronization conditions include at least:

[0131] The difference between the voltage amplitudes of the first voltage and the second voltage is within a preset voltage range;

[0132] The frequency difference between the first frequency and the second frequency is within a preset frequency range;

[0133] The phase angle difference between the first phase angle and the second phase angle is within the preset phase angle range.

[0134] Correspondingly, the grid-connected power generation equipment performs comparative analysis based on these two sets of parameters to determine whether the synchronization conditions are met, thereby ensuring the safety and stability of the grid connection process.

[0135] Specifically, the concurrent conditions include at least the following three aspects:

[0136] First, voltage amplitude matching. The amplitude difference between the primary voltage of the power grid and the secondary voltage of the generating equipment is controlled within a preset voltage range. This limitation ensures that the voltage amplitude output by the generating equipment is not too high or too low, avoiding voltage surges to the power grid or causing equipment malfunctions.

[0137] Secondly, frequency matching. By comparing the frequency difference between the first and second frequencies, it is kept within a preset frequency range. Precise frequency synchronization is crucial for ensuring power quality and stable system operation; excessive frequency difference may lead to power oscillations or even trigger equipment protection mechanisms.

[0138] Finally, phase angle matching. The phase angle difference between the power grid and the generating equipment is compared, ensuring it falls within the preset range. Proper phase angle matching guarantees the correctness of current and power flow directions, prevents inrush currents caused by phase mismatch, and maintains the smooth operation of the grid connection process.

[0139] In the above embodiments, by strictly controlling and matching the three electrical parameters of voltage, frequency and phase angle, the system can effectively determine whether the two grid-connected parties meet the synchronization conditions, ensuring that the power generation equipment is safely and smoothly connected to the grid, and achieving high-quality quasi-synchronous grid connection.

[0140] In one exemplary embodiment, the method further includes:

[0141] Step 1: Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment.

[0142] Step 2: Determine the difference between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference to obtain the adjusted second electrical parameter.

[0143] Step 3: After determining that the grid and grid-connected power generation equipment meet the synchronization conditions based on the adjusted second electrical parameters and the first electrical parameters, a closing control command is output to the closing remote control mechanism. This command drives the mains switch to perform a closing operation, achieving quasi-synchronous grid connection between the grid-connected power generation equipment and the grid. The first electrical parameters include a first voltage, a first frequency, and a first phase angle; the second electrical parameters include a second voltage, a second frequency, and a second phase angle. The synchronization conditions include at least: the voltage amplitude difference between the first and second voltages is within a preset voltage range; the frequency difference between the first and second frequencies is within a preset frequency range; and the phase angle difference between the first and second phase angles is within a preset phase angle range.

[0144] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0145] Based on the same inventive concept, this application also provides a grid-connected device for implementing the grid-connected method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more grid-connected device embodiments provided below can be found in the limitations of the grid-connected method described above, and will not be repeated here.

[0146] In one exemplary embodiment, such as Figure 12 As shown, a grid-connected device is provided, including: an acquisition module 701 and a determination module 702, wherein:

[0147] The acquisition module 701 is used to acquire the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0148] The determining module 702 is used to determine, based on the second electrical parameters and the first electrical parameters, that the power grid and the grid-connected power generation equipment meet the synchronization conditions, and output a closing control command to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform a closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0149] In an exemplary embodiment, the determining module 702 is specifically used to determine the difference information between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference information to obtain the adjusted second electrical parameter;

[0150] Based on the adjusted second electrical parameters and the first electrical parameters, and after determining that the power grid and grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism.

[0151] In an exemplary embodiment, the first electrical parameter includes a first voltage, a first frequency, and a first phase angle, and the second electrical parameter includes a second voltage, a second frequency, and a second phase angle; the synchronization conditions include at least: the difference between the voltage amplitudes of the first voltage and the second voltage is within a preset voltage range; the frequency difference between the first frequency and the second frequency is within a preset frequency range; and the phase angle difference between the first phase angle and the second phase angle is within a preset phase angle range.

[0152] Each module in the aforementioned grid-connected device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the grid-connected power generation equipment in hardware form or independent of it, or they can be stored in the memory of the grid-connected power generation equipment in software form, so that the processor can call and execute the operations corresponding to each module.

[0153] In one exemplary embodiment, a grid-connected power generation device is provided, the internal structure of which can be shown in the following diagram. Figure 13 As shown, the grid-connected power generation equipment includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores grid-connected data. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a grid-connected method.

[0154] Those skilled in the art will understand that Figure 13The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the grid-connected power generation equipment to which the present application is applied. Specific grid-connected power generation equipment may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0155] In one exemplary embodiment, a grid-connected power generation device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0156] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0157] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0158] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0159] Determine the difference information between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference information to obtain the adjusted second electrical parameter;

[0160] Based on the adjusted second electrical parameters and the first electrical parameters, and after determining that the power grid and grid-connected generating equipment meet the synchronization conditions, a closing control command is output to the remote closing control mechanism. The first electrical parameters include a first voltage, a first frequency, and a first phase angle; the second electrical parameters include a second voltage, a second frequency, and a second phase angle; the synchronization conditions include at least:

[0161] The difference between the voltage amplitudes of the first voltage and the second voltage is within a preset voltage range;

[0162] The frequency difference between the first frequency and the second frequency is within a preset frequency range;

[0163] The phase angle difference between the first phase angle and the second phase angle is within the preset phase angle range.

[0164] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0165] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0166] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0167] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0168] Determine the difference information between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference information to obtain the adjusted second electrical parameter;

[0169] Based on the adjusted second electrical parameters and the first electrical parameters, and after determining that the power grid and grid-connected generating equipment meet the synchronization conditions, a closing control command is output to the remote closing control mechanism. The first electrical parameters include a first voltage, a first frequency, and a first phase angle; the second electrical parameters include a second voltage, a second frequency, and a second phase angle; the synchronization conditions include at least:

[0170] The difference between the voltage amplitudes of the first voltage and the second voltage is within a preset voltage range;

[0171] The frequency difference between the first frequency and the second frequency is within a preset frequency range;

[0172] The phase angle difference between the first phase angle and the second phase angle is within the preset phase angle range.

[0173] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0174] Obtain the first electrical parameters of the power grid and the second electrical parameters of the grid-connected power generation equipment;

[0175] Based on the second electrical parameters and the first electrical parameters, and after determining that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism, so that the closing remote control mechanism drives the mains switch to perform the closing operation according to the closing control command, so as to achieve quasi-synchronous grid connection between the grid-connected power generation equipment and the power grid.

[0176] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0177] Determine the difference information between the first electrical parameter and the second electrical parameter, and adjust the second electrical parameter according to the difference information to obtain the adjusted second electrical parameter;

[0178] Based on the adjusted second electrical parameters and the first electrical parameters, and after determining that the power grid and grid-connected generating equipment meet the synchronization conditions, a closing control command is output to the remote closing control mechanism. The first electrical parameters include a first voltage, a first frequency, and a first phase angle; the second electrical parameters include a second voltage, a second frequency, and a second phase angle; the synchronization conditions include at least:

[0179] The difference between the voltage amplitudes of the first voltage and the second voltage is within a preset voltage range;

[0180] The frequency difference between the first frequency and the second frequency is within a preset frequency range;

[0181] The phase angle difference between the first phase angle and the second phase angle is within the preset phase angle range.

[0182] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0183] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0184] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A portable low-voltage main switch remote control synchronous grid connection system, characterized in that, The portable low-voltage main switch remote control synchronous grid-connected system includes grid-connected power generation equipment, a remote closing mechanism, and sampling clamps; the grid-connected power generation equipment is electrically connected to the load and the remote closing mechanism respectively; the sampling clamps are electrically connected to the power grid and the remote closing mechanism respectively. The sampling clamp is used to collect the first electrical parameters of the power grid and transmit the first electrical parameters to the grid-connected power generation equipment through the closing remote control mechanism; The grid-connected power generation equipment is used to provide electrical energy to the load after being connected to the grid. And based on the second electrical parameters of the grid-connected power generation equipment and the first electrical parameters, when it is determined that the power grid and the grid-connected power generation equipment meet the synchronization conditions, a closing control command is output to the closing remote control mechanism; The remote control mechanism for closing is used to drive the mains switch to perform a closing operation according to the closing control command, so as to realize the quasi-synchronous grid connection operation between the grid-connected power generation equipment and the power grid.

2. The system according to claim 1, characterized in that, The grid-connected power generation equipment includes a power generation device and a quasi-synchronous grid connection module, and the power generation device and the quasi-synchronous grid connection module interact with each other through an internal communication line. The quasi-synchronous grid connection module is used to acquire the first electrical parameters and the second electrical parameters of the power generation equipment, and output adjustment commands according to the first electrical parameters and the second electrical parameters; The power generation equipment is used to adjust parameters according to the adjustment command; The sampling clamp is also used to acquire the adjusted second electrical parameters and send the adjusted second electrical parameters to the power generation equipment through the quasi-synchronous grid connection module; The power generation equipment is also used to output a closing control command to the closing remote control mechanism and supply power to the load in the grid-connected state when it is determined that the power grid and the grid-connected power generation equipment meet the synchronization conditions based on the adjusted second electrical parameters and the first electrical parameters.

3. The system according to claim 2, characterized in that, The adjusted second electrical parameter is obtained by adjusting the second electrical parameter based on the difference information between the first electrical parameter and the second electrical parameter.

4. The system according to claim 2, characterized in that, The power generation equipment includes a generator and a power generation switch configured at the output terminal of the generator; After the mains power switch is turned off, the quasi-synchronous grid connection module controls the generator switch to turn on, so as to realize the quasi-synchronous grid connection between the generator and the power grid.

5. The system according to claim 1, characterized in that, The power grid includes an AC power source, a power grid switch, and a transformer connected in sequence; the output terminal of the transformer is connected to the sampling clamp.

6. The system according to claim 5, characterized in that, The sampling clamps are provided in two sets; the two sets of sampling clamps are respectively clamped to the output end of the transformer and the input end of the load.

7. The system according to any one of claims 1-6, characterized in that, The system also includes a bus clamp, through which the grid-connected power generation equipment is connected to the load and the mains switch respectively.

8. The system according to any one of claims 1-6, characterized in that, The first electrical parameter includes a first voltage, a first frequency, and a first phase angle; the second electrical parameter includes a second voltage, a second frequency, and a second phase angle. The contemporaneous conditions include at least the following: The difference in voltage amplitude between the first voltage and the second voltage is within a preset voltage range; The frequency difference between the first frequency and the second frequency is within a preset frequency range; The phase angle difference between the first phase angle and the second phase angle is within a preset phase angle range.

9. The system according to claim 8, characterized in that, The voltage range is 5% to 10% of the rated voltage, the frequency range is 0.2 Hz to 0.5 Hz, and the phase angle range is 10 degrees to 15 degrees.

10. The system according to any one of claims 1-6, characterized in that, The rated current of the sampling clamp is less than or equal to 63 amperes.

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