A synchronous non-inductive access and exit device and a method for protection control thereof

Abstract

The application discloses a kind of synchronous non-inductive access exit device and its protection control method, belong to alternating current power grid technical field, a kind of synchronous non-inductive access exit device and its protection control method, the device is by diesel generator car, 10kV mains, grid-connected cabinet, synchronous box is composed of grid-connected and off-grid control power grid;The inside of synchronous box is provided with base frame, square bottom frame is fixedly installed with wiring collection plate, vertical column is slidably connected with grid type carriage, four auxiliary support components are installed on grid type carriage, grid type top frame has synchronous grid-connected controller, auxiliary support component supports synchronous grid-connected controller, square bottom frame is fixedly installed with two vertical linear modules between and a grid type top frame, and heat dissipation component is installed at the top of grid type top frame.It can realize the effective adjustment of load when diesel generator car access exit, guarantee the power safety of resident, and reduce the influence of heat on the working effect of synchronous grid-connected controller.

Description

Technical Field

[0001] This invention relates to the field of AC power grid technology, and more specifically, to a synchronous non-sensory access and exit device and its protection and control method. Background Technology

[0002] As people's requirements for power supply reliability gradually increase, there is a growing demand for uninterrupted power supply during maintenance. Taking a distribution substation as an example, in the past, when carrying out maintenance work, it was necessary to first disconnect the mains power switch and then connect the diesel generator; after the maintenance was completed, it was necessary to first disconnect the diesel generator and then connect the mains power switch. This process involved two power outages, which, although short in duration, still affected the quality of life for residents and the power grid company's requirements for power supply quality.

[0003] Currently, some technologies have proposed devices and methods for synchronous grid connection of diesel generators. The general idea is to first connect the diesel generator to the grid during maintenance, and then disconnect it from the mains power; after maintenance, the same process is repeated to first reconnect it to the mains power and then disconnect the diesel generator. This method can achieve uninterrupted power supply operation, but it has shortcomings in the following aspects:

[0004] 1) When a diesel generator is switched from grid-connected to off-grid mode, or when a diesel generator is disconnected from the grid and taken out of operation, the sudden change in load may cause the output to change too quickly and cause abnormalities.

[0005] 2) During off-grid operation, the diesel generator truck supplies power to the entire distribution area. Due to the lack of grid support, voltage and frequency instability may occur, affecting the safety of residents' electricity use.

[0006] 3) When the synchronous non-sensory access exit device is working, it is necessary to frequently execute the synchronous grid connection logic and anti-synchronization logic, which are all controlled by the synchronous grid connection controller inside the synchronous box. The heat dissipation efficiency of the traditional heat dissipation method is low, and the high temperature environment may affect the working effect of the synchronous grid connection controller.

[0007] Therefore, in view of this, the present invention designs a synchronous non-intrusive access exit device and its protection control method, in order to achieve a more practical purpose. Summary of the Invention

[0008] 1. Technical problems to be solved

[0009] To address the problems existing in the prior art, the present invention aims to provide a synchronous non-sensory access and exit device and its protection and control method. It can effectively adjust the load when a diesel generator is connected and disconnected, avoid the situation of too rapid output change, ensure the normal operation of the diesel generator's non-sensory access and exit, avoid voltage and frequency instability, protect the electricity safety of residents, effectively improve the heat dissipation efficiency of the synchronous grid-connected controller, avoid the high temperature environment generated by the synchronous grid-connected controller, and reduce the impact of heat on the working effect of the synchronous grid-connected controller.

[0010] 2. Technical Solution

[0011] To solve the above problems, the present invention adopts the following technical solution.

[0012] A synchronous non-sensory access and disconnection device, which is a grid-connected and off-grid control grid consisting of a diesel generator vehicle, 10kV mains power, grid-connected cabinet, and synchronizing box;

[0013] The internal structure of the synchronizing box is a basic frame consisting of a square base frame, four straight columns, and a grid-type top frame. A wiring assembly plate is fixedly installed on the square base frame. The four straight columns form a slide rail structure, and a grid-type carriage is slidably connected to the slide rail structure. Four auxiliary support components are installed on the grid-type carriage. A synchronizing grid-connected controller is inserted downwards into the grid-type top frame and locked with bolts. The four auxiliary support components support the four sides of the synchronizing grid-connected controller. Several data cables connect the synchronizing grid-connected controller and the wiring assembly plate. Two vertical linear modules are fixedly installed between the square base frame and the grid-type top frame. A set of diagonal positions of the grid-type carriage is fixed to the moving parts of the corresponding vertical linear modules. A heat dissipation component is installed at the top of the grid-type top frame.

[0014] Furthermore, a spherical slider is fixed at each of the four corners of the grid-type carriage, and the four spherical sliders slide on the corresponding straight columns, wherein the outer surfaces of two of the spherical sliders are fixed to the movable parts of the corresponding vertical linear modules.

[0015] The center of the grid-type carriage is a square frame structure, and the square frame structure is slidably connected to the side of the synchronous grid-connected controller.

[0016] Furthermore, the four auxiliary support components are respectively installed on the four sides of the square frame structure. Each auxiliary support component includes a U-shaped base, on which a T-shaped plug is slidably connected. Several springs are fixedly installed between one end of the T-shaped plug and the inner side of the U-shaped base.

[0017] Furthermore, one end of the T-shaped plug is configured as an arc-shaped surface structure, and the horizontal projection length of the arc-shaped surface structure is greater than the width of the side strip of the square frame structure.

[0018] Furthermore, the spring is always kept in a compressed state, and the maximum distance between the T-shaped plug and the inner side of the U-shaped base is less than the horizontal projection length of the arc-shaped surface structure.

[0019] Furthermore, the two vertical linear modules are centrally symmetrically distributed, and the two vertical linear modules are synchronously raised and lowered by program control.

[0020] Furthermore, the heat dissipation assembly includes a docking bracket on which a heat sink is fixedly mounted. The heat sink is an integrated structure and includes a heat-collecting copper plate, several heat-conducting copper pipes, four heat dissipation fins, and four heat dissipation fans.

[0021] The heat-conducting copper pipe is attached to the upper surface of the synchronous grid-connected controller, and the heat dissipation fins are fixed to the top side of the docking bracket.

[0022] Furthermore, the bottom end of the docking bracket is fixed with four sockets, which are respectively engaged with the top end of the grid-type top frame and locked by bolts.

[0023] Furthermore, four heat dissipation fins are distributed on the four sides of the top of the docking bracket. The top of the docking bracket forms an air inlet groove, and the air inlets of the four cooling fans all face the air inlet groove. A dust filter is fixedly installed on the top of the air inlet groove by bolts.

[0024] A protection control method for a synchronous non-sensory access and exit device, wherein the specific implementation steps of the protection control method are as follows:

[0025] Step 1: Wiring the entire device: Connect the grid-connected cabinet to both sides of the mains switch in advance, disconnect BWK1 and BWK2, connect the portable synchronizing box to the grid-connected cabinet and the generator car respectively, and then close BWK1 and BWK2.

[0026] Step 2: Switch the diesel generator to power supply and enter maintenance mode: Connect the diesel generator, execute the synchronization grid connection logic, automatically adjust the frequency and voltage of the diesel generator, and then close the circuit breaker; after confirming the closing, disconnect the mains power switch. At this time, the diesel generator supplies power to the transformer area independently, and the mains power is maintained during maintenance.

[0027] Step 3: Exit Maintenance Mode: When it is necessary to exit maintenance mode, first execute the anti-synchronization logic between the diesel generator and the mains power, and then close the mains power switch after the synchronization conditions are met.

[0028] Step 4, Control of synchronous seamless connection and disconnection: Reduce the output of the diesel generator, transfer the load to the mains power supply, and after the transfer is completed, issue a shutdown command for the diesel generator, disconnect the diesel generator switch, and restore the switch to its initial state.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the advantages of this invention are:

[0031] ① This solution, the synchronous seamless connection and disconnection device, consists of several parts: a synchronous grid connection control module, an intelligent switch module, a communication interface module, and a keypad display module. The synchronous grid connection control module is the central hub of the entire system, possessing functions such as FIR calculation, abnormal logic judgment, synchronization calculation, diesel generator control, and load control. It realizes intelligent monitoring and automatic control of grid connection, ensuring the entire process is seamless. The intelligent switch module, communication interface module, and keypad display module serve as supporting interface modules, respectively providing interfaces for switch control, communication, and display. Ultimately, monitoring and control are integrated into a complete solution. This allows for effective load adjustment during diesel generator connection and disconnection, avoiding excessively rapid output changes and ensuring the normal operation of the diesel generator's seamless connection and disconnection.

[0032] ② This solution combines protection and control through a synchronous, non-inductive switching device. Synchronization control and protection are integrated. Before synchronization control, anomalies in the power grid are analyzed. When an anomaly occurs, the synchronization control process is blocked to mitigate synchronization risks in advance. Simultaneously, during synchronization, voltage and current are monitored in real time. If instability is detected, the control method is adjusted promptly, and direct disconnection is implemented if necessary.

[0033] Secondly, by adjusting the load, before switching from mains power and diesel generator to diesel generator power supply alone, the diesel generator is adjusted to be able to supply the load of the entire transformer area. After adjustment, the mains power switch is disconnected. At the same time, before the diesel generator is taken out of operation, the output power of the diesel generator is adjusted and reduced to a specified value before the diesel generator switch is disconnected. In this way, voltage, frequency and room temperature issues can be avoided, and the electricity safety of residents can be guaranteed.

[0034] ③ In this solution, the synchronous grid-connected controller is suspended and supported by a basic frame and auxiliary support components. The heat dissipation components conduct heat in multiple directions and dissipate heat from the synchronous grid-connected controller, which effectively improves the heat dissipation efficiency of the synchronous grid-connected controller, avoids the generation of high temperature environment due to heat accumulation in the synchronous grid-connected controller, and thus reduces the impact of heat on the working effect of the synchronous grid-connected controller. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure in this invention;

[0036] Figure 2 This is a schematic diagram of the planar structure in this invention;

[0037] Figure 3 This is a schematic diagram of the structure of the present invention without the heat dissipation component installed;

[0038] Figure 4 This is a schematic diagram of the auxiliary support component in this invention;

[0039] Figure 5 This is a three-dimensional structural diagram of the heat dissipation component in this invention;

[0040] Figure 6 This is a wiring diagram of the synchronous sensorless connection and disconnection device for the generator car in this invention;

[0041] Figure 7 This is a schematic diagram of the internal structure of the portable synchronous grid-connected box in this invention;

[0042] Figure 8 This is a schematic diagram of the FIR calculation process in this invention;

[0043] Figure 9 This is a schematic diagram of the locking condition for quasi-synchronous judgment in this invention.

[0044] Explanation of the labels in the diagram:

[0045] 1. Basic frame; 101. Square base frame; 102. Straight columns; 103. Grid-type top frame;

[0046] 2. Wiring control panel;

[0047] 3. Grid-type carriage; 301. Spherical slider;

[0048] 4. Auxiliary support components; 401. U-shaped base; 402. T-shaped insert; 4021. Arc-shaped surface structure; 403. Spring;

[0049] 5. Synchronous grid-connected controller;

[0050] 6. Data cable strap;

[0051] 7. Vertical linear module;

[0052] 8. Heat dissipation components; 801. Connecting bracket; 8011. Socket; 8012. Air intake slot; 8013. Dust filter; 802. Heat sink; 8021. Heat-collecting copper plate; 8022. Heat-conducting copper pipe; 8023. Heat dissipation fins; 8024. Cooling fan. Detailed Implementation

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0054] Example 1:

[0055] Please see Figure 1 - Figure 5 A synchronous non-sensory access and disconnection device, which is a grid-connected and off-grid control grid consisting of a diesel generator, a 10kV mains power supply, a grid-connected cabinet, and a synchronizing box;

[0056] The internal structure of the synchronizing box includes a basic frame 1, which consists of a square base frame 101, four straight columns 102, and a grid-type top frame 103. A wiring assembly plate 2 is fixedly installed on the square base frame 101. The four straight columns 102 form a slide rail structure, and a grid-type carriage 3 is slidably connected to the slide rail structure. Four auxiliary support components 4 are installed on the grid-type carriage 3. A synchronizing grid controller 5 is inserted downwards into the grid-type top frame 103 and locked with bolts. The four auxiliary support components 4 provide support for the four sides of the synchronizing grid controller 5. Several data cables 6 connect the synchronizing grid controller 5 and the wiring assembly plate 2. Two vertical linear modules 7 are fixedly installed between the square base frame 101 and the grid-type top frame 103. A set of diagonal positions of the grid-type carriage 3 are fixed to the moving parts of the corresponding vertical linear modules 7. A heat dissipation component 8 is installed at the top of the grid-type top frame 103.

[0057] See Figure 1 , Figure 3 Specifically, a spherical slider 301 is fixed at each of the four corners of the grid-type carriage 3. The four spherical sliders 301 slide on the corresponding straight column 102 respectively, and the outer surfaces of two of the spherical sliders 301 are fixed to the movable parts of the corresponding vertical linear module 7 respectively.

[0058] When the vertical linear module 7 slides, the spherical slider 301 can be controlled to slide, thereby controlling the entire grid-type carriage 3 to slide up and down.

[0059] The center of the grid-type carriage 3 is a square frame structure, and the square frame structure is slidably connected to the side of the synchronous grid-connected controller 5.

[0060] When the grid-type carriage 3 slides to the height of the side of the synchronous grid-connected controller 5, it can prevent the side of the grid-type carriage 3 from shaking, thus ensuring the stability of the synchronous grid-connected controller 5 during installation.

[0061] See Figure 1 , Figure 4 Specifically, four auxiliary support components 4 are respectively installed on the four sides of the square frame structure. The auxiliary support components 4 include a U-shaped base 401, a T-shaped plug 402 is slidably connected to the U-shaped base 401, and several springs 403 are fixedly installed between one end of the T-shaped plug 402 and the inner side of the U-shaped base 401.

[0062] Specifically, one end of the T-shaped plug-in 402 is set as an arc-shaped surface structure 4021, and the horizontal projection length of the arc-shaped surface structure 4021 is greater than the width of the side strip of the square frame structure.

[0063] As the height of the grid-type carriage 3 rises, the arc-shaped surface of the T-shaped plug 402 first contacts the synchronous grid-connected controller 5. As the height of the grid-type carriage 3 continues to rise, it will exert pressure on the arc-shaped surface structure 4021, thereby pushing the entire T-shaped plug 402 to move. At this time, the spring 403 is compressed. When the height of the grid-type carriage 3 stops changing, the grid-type carriage 3 forms a sliding limit on the side of the synchronous grid-connected controller 5. At the same time, the plane of the T-shaped plug 402 will provide a certain support for the synchronous grid-connected controller 5.

[0064] Specifically, the spring 403 is always kept in a compressed state, and the maximum distance between the T-shaped plug 402 and the inner side of the U-shaped base 401 is less than the horizontal projection length of the arc-shaped surface structure 4021.

[0065] The state of the spring 403 and its corresponding distance values ​​are controlled to ensure that the spring 403 can always provide thrust to the T-type plug 402, thereby making the T-type plug 402 fit with the synchronous grid-connected controller 5 and thus providing a certain support force.

[0066] See Figure 1 , Figure 2 , Figure 3 Specifically, the two vertical linear modules 7 are centrally symmetrically distributed, and the two vertical linear modules 7 are synchronously raised and lowered by program control.

[0067] The overall lifting and lowering of the grid-type carriage 3 is controlled by the lifting and lowering of the movable part of the vertical linear module 7, and the lifting and lowering stability is ensured. Each movable part of the vertical linear module 7 is equipped with a clamping lock. When the vertical linear module 7 drives the grid-type carriage 3 to rise to a certain height, the clamping lock is locked to prevent the grid-type carriage 3 from accidentally slipping.

[0068] The program for designing the synchronous lifting and lowering of two vertical linear modules 7 is a known and common technique, and will not be elaborated further.

[0069] See Figure 1 , Figure 2 , Figure 5Specifically, the heat dissipation component 8 includes a docking bracket 801, on which a heat sink 802 is fixedly installed. The heat sink 802 is an integrated structure and includes a heat collecting copper plate 8021, several heat conducting copper pipes 8022, four heat dissipation fins 8023 and four cooling fans 8024.

[0070] The heat-conducting copper pipe 8022 is attached to the upper surface of the synchronous grid-connected controller 5, and the heat dissipation fins 8023 are fixed to the top side of the docking bracket 801.

[0071] Specifically, the bottom of the docking bracket 801 is fixed with four sockets 8011, which are respectively engaged with the top of the grid-type top frame 103 and locked by bolts.

[0072] The installation and disassembly of the heat dissipation component 8 can be easily facilitated by using a docking and bolt locking method.

[0073] Specifically, four heat dissipation fins 8023 are distributed on the top four sides of the docking bracket 801. The top of the docking bracket 801 forms an air inlet slot 8012, and the air inlets of the four cooling fans 8024 all face the air inlet slot 8012. A dust filter 8013 is fixedly installed on the top of the air inlet slot 8012 by bolts.

[0074] Air is introduced through the air inlet slot 8012 to dissipate heat from the heat sink 8023. The four heat dissipation directions of the heat sink 8023 can greatly ensure heat dissipation efficiency. At the same time, the dust filter 8013 can also prevent dust from entering during heat dissipation.

[0075] Working principle:

[0076] This device is mainly used to control the heat dissipation of the synchronizing grid controller 5 inside the synchronizing box, so as to ensure the working efficiency of the synchronizing grid controller 5. Its specific implementation method is as follows:

[0077] The synchronous grid-connected controller 5 is fixed to the grid-type top frame 103 of the base frame 1 by bolts. Then, the vertical linear module 7 can control the height of the grid-type carriage 3, so that the grid-type carriage 3 reaches the specified height and is locked by the clamp, forming a limitation on the synchronous grid-connected controller 5. At the same time, the plane of the T-type plug 402 will provide a certain support for the synchronous grid-connected controller 5.

[0078] Then, when the grid-connected controller 5 is in operation, the heat is discharged through the heat-collecting copper plate 8021 of the radiator 802 and guided to the heat dissipation fins 8023 through the heat-conducting copper pipe 8022. Air is drawn in through the air inlet slot 8012 to dissipate heat from the heat dissipation fins 8023. The four heat dissipation directions of the heat dissipation fins 8023 greatly ensure heat dissipation efficiency.

[0079] In this way, the entire heat dissipation process can be completed.

[0080] Example 2:

[0081] Based on the above embodiment 1, further description is provided.

[0082] See Figure 6 A protection control method for a synchronous non-sensory access exit device, wherein the specific implementation steps of the protection control method are as follows:

[0083] Step 1: Wiring the entire device: Connect the grid-connected cabinet to both sides of the mains switch in advance, disconnect BWK1 and BWK2, connect the portable synchronizing box to the grid-connected cabinet and the generator car respectively, and then close BWK1 and BWK2.

[0084] Step 2: Switch the diesel generator to power supply and enter maintenance mode: Connect the diesel generator, execute the synchronization grid connection logic, automatically adjust the frequency and voltage of the diesel generator, and then close the circuit breaker; after confirming the closing, disconnect the mains power switch. At this time, the diesel generator supplies power to the transformer area independently, and the mains power is maintained during maintenance.

[0085] Step 3: Exit Maintenance Mode: When it is necessary to exit maintenance mode, first execute the anti-synchronization logic between the diesel generator and the mains power, and then close the mains power switch after the synchronization conditions are met.

[0086] Step 4, Control of synchronous seamless connection and disconnection: Reduce the output of the diesel generator, transfer the load to the mains power supply, and after the transfer is completed, issue a shutdown command for the diesel generator, disconnect the diesel generator switch, and restore the switch to its initial state.

[0087] Example 3:

[0088] Further description is provided based on the above embodiments 1 and 2.

[0089] See Figure 7 The portable synchronous grid-connected box consists of the following internal components:

[0090] Synchronization and grid connection control module. Located inside the synchronization and grid connection controller 5, it serves as the control center. It connects to the voltage of the grid side and the generation side, monitors and calculates the frequency and phase difference in real time, and makes synchronization judgments; it connects to the intelligent switch module to collect the switch status and control the switch opening and closing; it connects to the communication interface module to collect the diesel generator status and control the diesel generator to adjust the voltage and frequency; and it connects to the button display module to perform control operations according to the commands issued by the buttons, and at the same time presents the current status to the user through the display.

[0091] Intelligent switch module. Connected between the power grid and the generation side, it receives control commands from the synchronization grid control module and performs switching operations; it also has measurement and protection functions, automatically measuring the current operating power, determining the load capacity, and providing protection based on the current.

[0092] Communication interface module. Located inside the synchronous grid-connected controller 5, it receives interactive commands from the synchronous grid-connected control module, communicates with the diesel generator, collects diesel generator operating data, and controls the diesel generator to adjust its frequency and voltage;

[0093] Button display module. Located on the outer surface of the synchronous grid-connected box. Enables one-button control of the diesel generator's grid connection, off-grid operation, and shutdown, achieving full-process control through automated logic.

[0094] The aforementioned synchronous grid connection control module mainly includes several parts: FIR calculation, abnormal logic judgment, synchronous calculation, diesel generator control, and load control.

[0095] See Figure 8 Specifically, the FIR calculation is performed, and the calculation method is as follows:

[0096] Step S1, Data caching: Cache the most recent data from positions 0 to 95;

[0097] Step S2: Select the channels for FIR calculation, including: UAB1, UBC1, UCA1, UAB2, UBC2, and UCA2;

[0098] Step S3: Perform FIR calculation:

[0099]

[0100] Where x(n) is the data in the FIR calculation buffer, starting from 63 sampling points before the current FIR pointer position; Re and Im are the real and imaginary parts of the data 31 sampling points before the FIR pointer position.

[0101] See Figure 9 Specifically, the abnormal logic judgment includes voltage phase loss and voltage phase sequence abnormality, which serve as the blocking conditions for quasi-synchronous judgment.

[0102] The synchronization calculation module calculates the frequency difference, pressure difference, and angle difference respectively, and determines whether the synchronization conditions are met:

[0103]

[0104] ΔU=|U1|-|U2|

[0105]

[0106] The diesel generator control function controls the generator speed and voltage amplitude, with two control modes: direct DO PWM control and communication control. In direct DO control, the DO output PWM wave fine-tunes the speed and voltage. In communication control, the target speed is sent to the communication management unit for speed control. In direct DO control, the DO output duty cycle is adjusted using PID control. In communication control, commands are sent from the device to the communication management unit via the remote control register to achieve acceleration / deceleration and voltage adjustment, thereby adjusting the frequency and voltage. When communication mode is selected, the four labels mentioned above can be output to the Modbus remote control register via the connect control. These registers are the remote control registers of the communication management unit; each remote control operation increases / decreases the speed by 1 rpm or decreases the voltage by 0.5 volts. This requires communication control to be selected.

[0107] Load control adjusts load by increasing or decreasing engine speed. After a generator unit is connected to the grid but before disconnecting, the load needs to be transferred to the generator unit; after successful anti-synchronization of the generator unit, the load needs to be transferred to the mains power. Load control also requires controlling the engine speed to increase / decrease output. When load reduction is needed, a speed reduction command is issued once per speed regulation cycle, the current input power value is monitored, and the command is stopped once the set requirement is met.

[0108] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A synchronous, non-intrusive access and exit device, characterized in that: The device consists of a diesel generator truck, a 10kV mains power supply, a grid-connected cabinet, and a synchronization box, forming a grid-connected and off-grid control network. The internal structure of the synchronizing box is provided with a basic frame (1), which is a frame structure composed of a square bottom frame (101), four straight columns (102), and a grid-type top frame (103). A wiring assembly plate (2) is fixedly installed on the square bottom frame (101). The four straight columns (102) form a slide rail structure, and a grid-type carriage (3) is slidably connected on the slide rail structure. Four auxiliary support components (4) are installed on the grid-type carriage (3). A synchronizing grid controller is inserted downwards into the grid-type top frame (103). 5), and locked with bolts, four auxiliary support components (4) respectively support the four sides of the synchronous grid-connected controller (5), and several data cable strips (6) are connected between the synchronous grid-connected controller (5) and the wiring assembly board (2). Two vertical linear modules (7) are fixedly installed between the square bottom frame (101) and a grid-type top frame (103). A set of diagonal positions of the grid-type slide (3) are respectively fixed to the moving parts of the corresponding vertical linear modules (7). A heat dissipation component (8) is installed at the top of the grid-type top frame (103). The control unit inside the synchronization box comprises: The synchronous grid connection control module is located inside the synchronous grid connection controller (5). As the control center, it connects to the voltage of the grid side and the generation side, monitors and calculates the frequency and phase difference in real time, and makes a synchronous judgment. Connect to a smart switch module to collect switch status and control switch opening and closing; The communication interface module is connected to collect the status of the diesel generator and control the generator to adjust its voltage and frequency. The system integrates a button display module to control operations based on commands issued by the buttons, while simultaneously displaying the current status to the user. The intelligent switch module is connected between the power grid and the power generation side. It receives control commands from the synchronous grid connection control module, performs switching operations, and has its own measurement and protection functions. It automatically measures the current operating power, determines the load capacity, and performs protection based on the current. The communication interface module is located inside the synchronous grid-connected controller (5). It receives interactive commands from the synchronous grid-connected control module, communicates with the diesel generator, collects diesel generator operating data, and controls the diesel generator to adjust frequency and voltage. The button display module is located on the outer surface of the synchronous grid-connected box; it enables one-button control of the diesel generator's grid connection, off-grid operation, and shutdown, and achieves full-process control through automated logic; The aforementioned synchronous grid connection control module mainly includes several parts: FIR calculation, abnormal logic judgment, synchronous calculation, diesel generator control, and load control.

2. The synchronous seamless access and exit device according to claim 1, characterized in that: At each of the four corners of the grid-type carriage (3), a spherical slider (301) is fixed. The four spherical sliders (301) slide on the corresponding straight column (102). The outer surfaces of two of the spherical sliders (301) are fixed to the movable parts of the corresponding vertical linear module (7). The center of the grid-type carriage (3) is a square frame structure, and the square frame structure is slidably connected to the side of the synchronous grid-connected controller (5).

3. The synchronous seamless access and exit device according to claim 2, characterized in that: The four auxiliary support components (4) are respectively installed on the four sides of the square frame structure. The auxiliary support component (4) includes a U-shaped base (401), and a T-shaped plug (402) is slidably connected on the U-shaped base (401). A number of springs (403) are fixedly installed between one end of the T-shaped plug (402) and the inner side of the U-shaped base (401).

4. The synchronous seamless access and exit device according to claim 3, characterized in that: One end of the T-shaped plug (402) is set as an arc-shaped surface structure (4021), and the horizontal projection length of the arc-shaped surface structure (4021) is greater than the width of the side strip of the square frame structure.

5. A synchronous seamless access and exit device according to claim 3, characterized in that: The spring (403) is always kept in a compressed state, and the maximum distance between the T-shaped plug (402) and the inner side of the spiral base (401) is less than the horizontal projection length of the arc-shaped surface structure (4021).

6. The synchronous seamless access and exit device according to claim 1, characterized in that: The two vertical linear modules (7) are centrally symmetrically distributed, and the two vertical linear modules (7) are synchronously raised and lowered by program control.

7. A synchronous, non-intrusive access and exit device according to claim 1, characterized in that: The heat dissipation assembly (8) includes a docking bracket (801), on which a heat sink (802) is fixedly installed. The heat sink (802) is an integrated structure and includes a heat collecting copper plate (8021), several heat conducting copper pipes (8022), four heat dissipation fins (8023) and four cooling fans (8024). The heat-conducting copper pipe (8022) is attached to the upper end face of the synchronous grid-connected controller (5), and the heat dissipation fins (8023) are fixed to the top side of the docking bracket (801).

8. A synchronous seamless access and exit device according to claim 7, characterized in that: The bottom end of the docking bracket (801) is fixed with four sockets (8011), which are respectively engaged with the top end of the grid-type top frame (103) and locked by bolts.

9. A synchronous seamless access and exit device according to claim 1, characterized in that: Four heat dissipation fins (8023) are distributed on the four sides of the top of the docking bracket (801). The top of the docking bracket (801) forms an air inlet slot (8012), and the air inlets of the four cooling fans (8024) all face the air inlet slot (8012). A dust filter (8013) is fixedly installed on the top of the air inlet slot (8012) by bolts.

10. A protection control method for a synchronous non-inductive access and exit device obtained according to any one or more of claims 1 to 9, characterized in that: The specific implementation steps of the protection and control method are as follows: Step 1: Wiring the entire device: Connect the grid-connected cabinet to both sides of the mains switch in advance, disconnect BWK1 and BWK2, connect the portable synchronizing box to the grid-connected cabinet and the generator car respectively, and then close BWK1 and BWK2. Step 2: Switch the diesel generator to power supply and enter maintenance mode: Connect the diesel generator, execute the synchronization grid connection logic, automatically adjust the frequency and voltage of the diesel generator, and then close the circuit breaker; After confirming that the circuit is closed, disconnect the mains power switch. At this time, the diesel generator truck will supply power to the transformer area separately, while the mains power is being inspected and repaired. Step 3: Exit maintenance mode: When it is necessary to exit maintenance mode, first execute the anti-synchronization logic between the diesel generator and the mains power, and then close the mains power switch after the synchronization conditions are met. Step 4, Control of synchronous seamless connection and disconnection: Reduce the output of the diesel generator, transfer the load to the mains power supply, and after the transfer is completed, issue a shutdown command for the diesel generator, disconnect the diesel generator switch, and restore the switch to its initial state.

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