Automatic grid-connected splitting control method, system and equipment for mobile generator car and medium

Abstract

The invention discloses an automatic grid-connected splitting control method, system, equipment and medium for a mobile generator car, and relates to the technical field of uninterruptible power operation of a power distribution network of a power system and a micro-grid, comprising the following steps of: controlling a main grid-connected switch to open and close based on a real-time main car phase difference, a real-time main car frequency difference and a real-time main car voltage difference; when the main grid-connected switch is closed, the main vehicle is controlled to access the power distribution network and bear a first preset load; according to the real-time master vehicle load rate, the real-time slave vehicle phase difference, the real-time slave vehicle frequency difference and the real-time slave vehicle voltage difference, a slave grid-connected switch is controlled to be turned on and off; when the slave grid-connected switch is closed, controlling the slave vehicle to access the power distribution network and bear a second preset load; carrying out load distribution between the master vehicle and the slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate; and when the maintenance of the power distribution network is completed, master vehicle load transfer and slave vehicle load transfer are controlled according to a preset proportion, and master splitting and slave splitting are realized. The problems of electric vehicle motor damage or power distribution network oscillation, short-time power failure and disordered operation steps in the prior art can be solved.

Description

Technical Field

[0001] This application relates to the fields of live-line working on power distribution networks and microgrid technology, specifically to a method, system, equipment, and medium for automatic grid connection and disconnection control of a mobile generator vehicle. Background Technology

[0002] Currently, with the continuous development of live-line working technology for medium and low voltage distribution networks, the research demand for key technologies for mobile generator grid connection is increasing. Related technologies mainly involve connecting mobile generators to the distribution network to provide temporary load power during maintenance. This aims to optimize grid connection and disconnection methods to avoid damage to the generator motor and instability in the distribution network system, thereby achieving true live-line working and ensuring the continuity of power supply to users. The research process must adhere to technical specifications such as GB / T18857-2019 "Technical Guidelines for Live-Line Working on Distribution Lines" and Q / GDW 10799.8-2023 "State Grid Corporation of China Power Safety Work Regulations (Part 8: Distribution Section)". The focus is on analyzing the impact of phase difference, frequency difference, and voltage difference on slip, and designing an uninterrupted power supply operation process that includes four stages: main grid connection, main disconnection, slave grid connection, and slave disconnection.

[0003] However, existing technologies have significant shortcomings: First, the load fluctuations in medium and low voltage distribution networks are large (e.g., the difference between peak and off-peak electricity consumption can reach 50%). Existing solutions control grid connection parameters (phase difference, frequency difference, and voltage difference) through "manual reading of instruments + manual adjustment of parameters," resulting in allowable errors of phase difference, frequency difference, and voltage difference often exceeding ±2° / ±0.2Hz / ±3%, which can easily exceed safe limits and potentially damage generator motors or cause distribution network oscillations. Second, when multiple generators operate in tandem, existing solutions, through "manual load transfer + sequential switch disconnection," may cause a "load vacuum" phenomenon during the disconnection process (i.e., the load is not transferred to the distribution network or other generators in time), leading to short-term power outages and failing to meet the demand for "seamless power consumption." Finally, existing solutions only follow a fuzzy sequence of "main grid connection → main disconnection → secondary grid connection → secondary disconnection," which leads to chaotic operation steps and further increases the risk of system instability.

[0004] Therefore, how to control the automatic grid connection and disconnection of mobile generator vehicles to solve the problems of generator motor damage, power grid oscillation, short-term power outages and chaotic operation procedures in the existing technology is an urgent issue that needs to be addressed. Summary of the Invention

[0005] This application provides a method, system, equipment, and medium for automatic grid connection and disconnection control of mobile generator vehicles, which can solve the problems of damaged trolley motors, power grid oscillations, short-term power outages, and chaotic operation procedures in the prior art.

[0006] In a first aspect, embodiments of this application provide an automatic grid connection and disconnection control method for mobile generator vehicles, the method comprising: The main grid-connected switch is controlled based on the real-time phase difference, frequency difference, and voltage difference of the main vehicle. When the main grid connection switch is closed, the main vehicle is controlled to connect to the distribution network and assume the first preset load; The grid connection switch is controlled to open and close based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle. When the grid connection switch is closed, the vehicle is controlled to connect to the power distribution network and assume a second preset load, where the first preset load is greater than the second preset load. Load allocation between the master and slave vehicles is based on real-time master vehicle load rate and real-time slave vehicle load rate. When the power distribution network maintenance is completed, the load transfer of the master train and the slave train is controlled according to the preset ratio to realize the master train disconnection and slave train disconnection.

[0007] In conjunction with the first aspect, in one implementation, controlling the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference includes: If the real-time main vehicle phase difference is not greater than the preset phase difference threshold, the real-time main vehicle frequency difference is not greater than the preset frequency difference threshold, and the real-time main vehicle voltage difference is not greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to close. If the real-time phase difference of the main vehicle is detected to be greater than the preset phase difference threshold, or the real-time frequency difference of the main vehicle is greater than the preset frequency difference threshold, or the real-time voltage difference of the main vehicle is greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to remain in the open state.

[0008] In conjunction with the first aspect, in one implementation, controlling the opening and closing of the grid-connected switch based on the real-time master vehicle load rate, real-time slave vehicle phase difference, real-time slave vehicle frequency difference, and real-time slave vehicle voltage difference includes: If the real-time load rate of the master vehicle is greater than the preset load rate threshold, the grid connection switch will be turned on and off based on the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. If the real-time load rate of the main vehicle is not greater than the preset load rate threshold, the control will keep the grid connection switch in the off state.

[0009] In conjunction with the first aspect, in one implementation, the control of the grid-connected switch opening and closing based on the real-time slave-vehicle phase difference, real-time slave-vehicle frequency difference, and real-time slave-vehicle voltage difference includes: If the real-time phase difference between the slave vehicle and the vehicle is not greater than the preset phase difference threshold, the real-time frequency difference between the slave vehicle and the vehicle is not greater than the preset frequency difference threshold, and the real-time voltage difference between the slave vehicle and the vehicle is not greater than the preset voltage difference threshold, then the slave grid-connected switch is closed. If the real-time phase difference between the slave and vehicle is detected to be greater than a preset phase difference threshold, or the real-time frequency difference between the slave and vehicle is greater than a preset frequency difference threshold, or the real-time voltage difference between the slave and vehicle is greater than a preset voltage difference threshold, then the slave grid-connected switch is controlled to remain in the open state.

[0010] In conjunction with the first aspect, in one implementation, the load allocation between the master and slave vehicles based on the real-time master vehicle load rate and the real-time slave vehicle load rate includes: The real-time load rate of the master vehicle and the real-time load rate of the slave vehicle are controlled by preset load rate thresholds to achieve load distribution between the master vehicle and the slave vehicle.

[0011] In conjunction with the first aspect, in one implementation, the preset ratio includes a first preset ratio and a second preset ratio, wherein the first preset ratio is greater than the second preset ratio, and the step of controlling the load transfer of the master vehicle and the load transfer of the slave vehicle according to the preset ratio to achieve master-slave disconnection and slave disconnection includes: The first preset proportion of the load on the main train is transferred to the distribution network, and the second preset proportion of the load on the main train is transferred to the slave train. At this time, the main grid connection switch is disconnected to achieve main train disconnection. When the slave vehicle receives a disconnection signal from the master vehicle, it controls the transfer of the slave vehicle's load to the distribution network. At this time, the slave vehicle's grid connection switch is disconnected to achieve slave disconnection.

[0012] In conjunction with the first aspect, in one embodiment, the method further includes: For both the master vehicle and the slave vehicle, if a target condition is detected, the grid connection switch is controlled to switch from a closed state to an open state. The target condition includes a real-time phase difference greater than a preset phase difference threshold, a real-time frequency difference greater than a preset frequency difference threshold, or a real-time voltage difference greater than a preset voltage difference threshold.

[0013] Secondly, embodiments of this application provide an automatic grid connection and disconnection control system for mobile generator vehicles, the automatic grid connection and disconnection control system for mobile generator vehicles comprising: The first processing module is used to control the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference and real-time main vehicle voltage difference. The second processing module is used to control the main vehicle to connect to the power distribution network and assume the first preset load when the main grid connection switch is closed; The third processing module is used to control the opening and closing of the grid-connected switch based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle. The fourth processing module is used to control the vehicle to connect to the power distribution network and assume a second preset load when the grid connection switch is closed, wherein the first preset load is greater than the second preset load; The fifth processing module is used to allocate the load between the master vehicle and slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate. The sixth processing module is used to control the load transfer of the master train and the slave train according to a preset ratio when the power distribution network maintenance is completed, so as to realize the master train disconnection and slave train disconnection.

[0014] Thirdly, embodiments of this application provide an automatic grid connection and disconnection control device for mobile generator vehicles. The automatic grid connection and disconnection control device for mobile generator vehicles includes a processor, a memory, and an automatic grid connection and disconnection control program for mobile generator vehicles stored in the memory and executable by the processor. When the automatic grid connection and disconnection control program for mobile generator vehicles is executed by the processor, it implements the steps of the automatic grid connection and disconnection control method for mobile generator vehicles as described in any of the preceding claims.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing a mobile generator automatic grid connection and disconnection control program, wherein when the mobile generator automatic grid connection and disconnection control program is executed by a processor, it implements the steps of the mobile generator automatic grid connection and disconnection control method as described in any of the preceding claims.

[0016] The beneficial effects of the technical solutions provided in this application include: The main grid connection switch is controlled by real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference. When the main grid connection switch is closed, the main vehicle is controlled to connect to the distribution network and undertake the first preset load. The slave grid connection switch is controlled by real-time main vehicle load rate, real-time slave vehicle phase difference, real-time slave vehicle frequency difference, and real-time slave vehicle voltage difference. The above real-time parameters can ensure that load fluctuations are captured instantly, so as to prevent the allowable errors of phase difference, frequency difference, and voltage difference from exceeding the safe range, thereby avoiding damage to the generator motor or distribution network oscillation, and thus better controlling the opening and closing of the main grid connection switch and the slave grid connection switch. When the slave grid connection switch is closed, the slave vehicle is controlled to connect to the distribution network and undertake the second preset load. The first preset load is greater than the second preset load; the load distribution between the master vehicle and slave vehicle is based on the real-time master vehicle load rate and the real-time slave vehicle load rate to avoid load distribution chaos, so that the distribution network load always has a stable load-bearing body, completely eliminating the "load vacuum", thereby avoiding short-term power outages and meeting the demand for "seamless power use"; after the distribution network maintenance is completed, the master vehicle load transfer and slave vehicle load transfer are controlled according to the preset ratio to realize master disconnection and slave disconnection; this application reduces the chaos of manual operation through the timing mechanism of master grid connection, slave grid connection, load distribution, master disconnection and slave disconnection, adapts to the multi-vehicle collaborative scenario of medium and low voltage distribution networks, and indirectly improves the overall efficiency of uninterrupted power supply operation. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of the automatic grid connection and disconnection control method for mobile generator vehicles according to this application; Figure 2 For this application Figure 1 A detailed flowchart of step S10; Figure 3 This is a schematic diagram of the functional modules of an embodiment of the automatic grid connection and disconnection control system for mobile generator vehicles in this application; Figure 4 This is a schematic diagram of the hardware structure of the automatic grid connection and disconnection control device for mobile generator vehicles involved in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] In a first aspect, embodiments of this application provide an automatic grid connection and disconnection control method for mobile generator vehicles.

[0021] In one embodiment, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the automatic grid connection and disconnection control method for mobile generator vehicles according to this application. Figure 1 As shown, the automatic grid connection and disconnection control method for mobile generator vehicles includes: Step S10: Control the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference.

[0022] In this embodiment of the application, the mobile power generation vehicle refers to a mobile power generation device used for temporary power supply, and the "master vehicle (master power generation vehicle)" and "slave vehicle (slave power generation vehicle)" are dynamic roles in a multi-vehicle collaborative operation scenario. Specifically, when multiple mobile power generation vehicles are working together, the system dynamically divides the roles of master vehicle and slave vehicle. The master vehicle refers to a mobile power generation vehicle with a rated capacity ≥ 60% of the current total load of the distribution network (e.g., when the total load is 1000kVA, the rated capacity of the master vehicle is ≥ 600kVA), which undertakes the core power supply task and the process leadership. The slave vehicle refers to a mobile power generation vehicle with a rated capacity < 60% of the current total load of the distribution network (e.g., when the total load is 1000kVA, the rated capacity of the slave vehicle is < 600kVA), which passively executes the master vehicle's instructions and only participates in load distribution as a supplementary power supply entity.

[0023] It should be noted that the real-time main vehicle phase difference refers to the instantaneous deviation between the phase of the main vehicle output voltage and the phase of the distribution network voltage; the real-time main vehicle frequency difference refers to the instantaneous deviation between the main vehicle output frequency and the distribution network frequency; and the real-time main vehicle voltage difference refers to the instantaneous deviation between the amplitude of the main vehicle output voltage and the amplitude of the distribution network voltage. In this embodiment, the above parameters are preferably monitored in real time at the millisecond level by a three-phase parameter acquisition module with a sampling frequency of 1kHz, and the slip adjustment module with a response time of ≤15ms is used to dynamically correct the generator output parameters (including frequency regulation throttle, voltage regulation excitation current, and phase compensation) to ensure that the real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference are stable within the safe threshold range before the main vehicle is connected to the grid. Thus, the main grid connection switch is accurately closed when the parameters meet the standards, and the main grid connection switch is kept open when the parameters do not meet the standards, so as to realize the control of the opening and closing of the main grid connection switch.

[0024] Step S20: When the main grid connection switch is closed, control the main vehicle to connect to the distribution network and assume the first preset load.

[0025] In this embodiment of the application, the first preset load refers to the initial load value borne by the main generator when it is connected to the distribution network after the main grid connection switch is closed. The purpose is to enable the main generator to quickly establish a stable power supply foundation at the moment of grid connection. Its value can be dynamically set based on the real-time total load of the distribution network, and is not limited here. For example, when the total load is 1000kVA, the first preset load can preferably be 800kVA. Specifically, when the parameters meet the safety conditions, the main grid connection switch is closed precisely so that the main generator can be smoothly connected to the distribution network and bear the first preset load. This effectively eliminates the inrush current caused by excessive slip, avoids mechanical stress damage to the generator motor and the risk of oscillation in the distribution network system, thereby ensuring the smooth connection and power supply continuity of the grid connection process.

[0026] Step S30: Control the opening and closing of the grid-connected switch based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle.

[0027] In an exemplary embodiment of this application, the real-time master vehicle load rate refers to the percentage of the current actual load of the master generator car to its rated capacity (e.g., if the rated capacity of the master vehicle is 1000kVA and the actual load is 800kVA, then the load rate is 80%), the real-time slave vehicle phase difference refers to the instantaneous deviation between the phase of the output voltage of the slave generator car and the phase of the distribution network voltage, the real-time slave vehicle frequency difference refers to the instantaneous deviation between the output frequency of the slave generator car and the frequency of the distribution network, and the real-time slave vehicle voltage difference refers to the instantaneous deviation between the amplitude of the output voltage of the slave generator car and the amplitude of the distribution network voltage; the preferred embodiment of this application... A three-phase parameter acquisition module with a sampling frequency of 1kHz is used to perform millisecond-level dynamic monitoring of the above parameters. A slip adjustment module with a response time of ≤15ms is used to correct the output parameters from the generator car in real time (including frequency regulation throttle, voltage regulation excitation current and phase compensation) to ensure that the real-time phase difference, frequency difference and voltage difference between the generator car and the grid are stable within the safe threshold range before the generator car is connected to the grid. This allows for precise closing of the generator car grid connection switch when the parameters meet the standards, and control of the generator car grid connection switch to remain open when the parameters do not meet the standards, thereby achieving control over the opening and closing of the generator car grid connection switch.

[0028] Step S40: When the grid connection switch is closed, the vehicle is controlled to connect to the power distribution network and assume the second preset load, where the first preset load is greater than the second preset load.

[0029] In this exemplary embodiment, the second preset load refers to the load value undertaken by the generator vehicle when it is safely connected to the distribution network after the grid connection switch is closed. Its value can be dynamically calculated based on the real-time total load of the distribution network. It is only necessary to ensure that the second preset load is not greater than the first preset load. There is no limitation here. For example, when the total load is 1000kVA and the first preset load is 800kVA, the second preset load can preferably be 400kVA. Specifically, when the parameters meet the safety conditions, the grid connection switch is closed precisely, so that the generator vehicle can be smoothly connected to the distribution network and undertake the second preset load. This achieves seamless synchronous connection between the generator vehicle and the distribution network, effectively eliminating the risk of inrush current and distribution network system oscillation caused by parameter deviation, and ensuring the continuity of load transfer and power supply stability in multi-vehicle collaborative operation.

[0030] Step S50: Distribute the load between the master vehicle and slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate.

[0031] In this exemplary embodiment, the real-time slave vehicle load rate refers to the percentage of the current actual load of the slave generator vehicle to its rated capacity. After the slave generator vehicle is connected to the distribution network, the system continuously monitors the load status of the master and slave vehicles through a three-phase parameter acquisition module with a sampling frequency of 1kHz and a dynamic adjustment module with a slip of ≤15ms. Based on the real-time master vehicle load rate, the real-time slave vehicle load rate, and the preset load rate threshold, the system distributes the load between the master and slave vehicles to achieve precise balance of the total load of the distribution network. This ensures that the real-time phase difference, real-time frequency difference, and real-time voltage difference remain stable within the safety threshold, effectively avoiding inrush currents and distribution network system oscillations caused by sudden load changes, maintaining the continuous power supply requirements of the user end, thereby eliminating the risk of chaotic load distribution and ensuring that the distribution network load is always stably carried by the master-slave vehicle cooperative system.

[0032] Step S60: When the power distribution network maintenance is completed, the load transfer of the main train and the load transfer of the slave train are controlled according to the preset ratio to realize the main train disconnection and slave train disconnection.

[0033] As an example, in the embodiments of this application, the specific value of the preset ratio can be determined according to actual needs and is not limited here; after the distribution network maintenance is completed, the system dynamically executes load transfer control according to the preset ratio, wherein the main generator first transfers the load of the preset ratio to the distribution network and the slave generator, completing the main disconnection; after receiving the main generator disconnection signal, the slave generator transfers all of its current load to the distribution network, completing the slave disconnection.

[0034] This application controls the opening and closing of the main grid-connected switch by measuring the real-time phase difference, frequency difference, and voltage difference of the main vehicle. When the main grid-connected switch is closed, the main vehicle is controlled to connect to the distribution network and assume the first preset load. The application also controls the opening and closing of the slave grid-connected switch based on the real-time load rate of the main vehicle, the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. These real-time parameters ensure that load fluctuations are captured instantaneously, preventing the allowable errors of phase difference, frequency difference, and voltage difference from exceeding safe limits, thereby avoiding damage to the generator or distribution network oscillations, and thus better controlling the opening and closing of the main and slave grid-connected switches. When the slave grid-connected switch is closed, the slave vehicle is controlled to connect to the distribution network and assume the second preset load. The first preset load is greater than the second preset load; the load distribution between the master vehicle and slave vehicle is based on the real-time master vehicle load rate and the real-time slave vehicle load rate to avoid load distribution chaos, so that the distribution network load always has a stable load-bearing body, completely eliminating the "load vacuum", thereby avoiding short-term power outages and meeting the demand for "seamless power use"; after the distribution network maintenance is completed, the master vehicle load transfer and slave vehicle load transfer are controlled according to the preset ratio to realize master disconnection and slave disconnection; this application reduces the chaos of manual operation through the timing mechanism of master grid connection, slave grid connection, load distribution, master disconnection and slave disconnection, adapts to the multi-vehicle collaborative scenario of medium and low voltage distribution networks, and indirectly improves the overall efficiency of uninterrupted power supply operation.

[0035] Furthermore, in one embodiment, reference is made to Figure 2 As shown, the control of the main grid-connected switch opening and closing based on the real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference includes: Step S101: If the real-time main vehicle phase difference is not greater than the preset phase difference threshold, the real-time main vehicle frequency difference is not greater than the preset frequency difference threshold, and the real-time main vehicle voltage difference is not greater than the preset voltage difference threshold, then control the main grid-connected switch to close.

[0036] Step S102: If the real-time main vehicle phase difference is detected to be greater than the preset phase difference threshold, or the real-time main vehicle frequency difference is detected to be greater than the preset frequency difference threshold, or the real-time main vehicle voltage difference is detected to be greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to remain in the open state.

[0037] As an example, in this embodiment, the specific values ​​of the preset phase difference threshold, preset frequency difference threshold, and preset voltage difference threshold can be determined according to actual needs and are not limited here. For example, the preset phase difference threshold can preferably be 1.2°, the preset frequency difference threshold can preferably be 0.1Hz, and the preset voltage difference threshold can preferably be 2.0%. If the real-time main vehicle phase difference is not greater than the preset phase difference threshold, the real-time main vehicle frequency difference is not greater than the preset frequency difference threshold, and the real-time main vehicle voltage difference is not greater than the preset voltage difference threshold, it indicates that the main vehicle parameters are synchronously stable and meet the grid connection safety requirements, and then the main grid connection switch is controlled to close. If the real-time main vehicle phase difference is greater than the preset phase difference threshold, or the real-time main vehicle frequency difference is greater than the preset frequency difference threshold, or the real-time main vehicle voltage difference is greater than the preset voltage difference threshold, it indicates that the main vehicle parameters have an out-of-tolerance risk and do not meet the grid connection safety conditions, and then the main grid connection switch is controlled to remain in the open state.

[0038] Further, in one embodiment, controlling the opening and closing of the grid-connected switch based on the real-time master vehicle load rate, real-time slave vehicle phase difference, real-time slave vehicle frequency difference, and real-time slave vehicle voltage difference includes: If the real-time load rate of the master vehicle is greater than the preset load rate threshold, the grid connection switch will be turned on and off based on the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. If the real-time load rate of the main vehicle is not greater than the preset load rate threshold, the control will keep the grid connection switch in the off state.

[0039] In this embodiment, the specific value of the preset load rate threshold can be determined according to actual needs and is not limited here. For example, the preset load rate threshold can preferably be 80%. If the real-time load rate of the main vehicle is greater than the preset load rate threshold, it means that the current load of the main generator has exceeded the safe operating limit, and the distribution network load demand increases and power supply capacity needs to be supplemented. At this time, the grid connection switch is controlled to open and close based on the relationship between the real-time phase difference, real-time frequency difference, and real-time voltage difference of the slave vehicle and the preset threshold. If the real-time load rate of the main vehicle is not greater than the preset load rate threshold, it means that the load of the main generator is within the safe carrying range and can independently maintain the continuity of power supply to the distribution network. In this case, the grid connection switch is controlled to remain open. Through the collaborative logic of the main vehicle load rate threshold triggering mechanism and the real-time matching of slave vehicle parameters, it is ensured that the slave generator is accurately connected only when the risk of main vehicle overload occurs, avoiding inrush current or system oscillation caused by load change, and realizing seamless transfer of distribution network load and seamless power supply switching.

[0040] Further, in one embodiment, the control of the grid-connected switch opening and closing based on the real-time slave-vehicle phase difference, real-time slave-vehicle frequency difference, and real-time slave-vehicle voltage difference includes: If the real-time phase difference between the slave vehicle and the vehicle is not greater than the preset phase difference threshold, the real-time frequency difference between the slave vehicle and the vehicle is not greater than the preset frequency difference threshold, and the real-time voltage difference between the slave vehicle and the vehicle is not greater than the preset voltage difference threshold, then the slave grid-connected switch is closed. If the real-time phase difference between the slave and vehicle is detected to be greater than a preset phase difference threshold, or the real-time frequency difference between the slave and vehicle is greater than a preset frequency difference threshold, or the real-time voltage difference between the slave and vehicle is greater than a preset voltage difference threshold, then the slave grid-connected switch is controlled to remain in the open state.

[0041] In an exemplary embodiment of this application, if the real-time phase difference between the slave and vehicle is not greater than a preset phase difference threshold, the real-time frequency difference between the slave and vehicle is not greater than a preset frequency difference threshold, and the real-time voltage difference between the slave and vehicle is not greater than a preset voltage difference threshold, it indicates that the slave parameters are synchronously stable and meet the grid connection safety requirements, and the slave grid connection switch is controlled to close; if the real-time phase difference between the slave and vehicle is greater than a preset phase difference threshold, or the real-time frequency difference between the slave and vehicle is greater than a preset frequency difference threshold, or the real-time voltage difference between the slave and vehicle is greater than a preset voltage difference threshold, it indicates that the slave parameters have a risk of exceeding tolerance and do not meet the grid connection safety conditions, and the slave grid connection switch is controlled to remain open.

[0042] Furthermore, in one embodiment, the load allocation between the master vehicle and slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate includes: The real-time load rate of the master vehicle and the real-time load rate of the slave vehicle are controlled by preset load rate thresholds to achieve load distribution between the master vehicle and the slave vehicle.

[0043] In an exemplary embodiment of this application, the system monitors the load rate of the main generator (the percentage of the actual load of the main generator to its rated capacity) and the load rate of the slave generator (the percentage of the actual load of the slave generator to its rated capacity) in real time through a three-phase parameter acquisition module with a sampling frequency of 1kHz and a dynamic adjustment module with a slip of ≤15ms. It dynamically adjusts the output power of the main generator to precisely control the load rate at a preset load rate threshold (e.g., 80%), while simultaneously adjusting the output power of the slave generator to maintain a stable load rate at the preset load rate threshold (e.g., 80%). This allows the load rate of the main generator to smoothly transition from an initial overload state (e.g., 120%) to the preset load rate threshold, and the load rate of the slave generator to rapidly increase from the grid connection point (e.g., 0%) and stabilize at the preset load rate threshold, achieving dynamic balance of the total distribution network load (e.g., 800kVA main generator + 400kVA slave generator = ...). (1200kVA) effectively avoids the risk of inrush current and system oscillation caused by uneven load distribution, ensures that the distribution network load is always stably carried by the master-slave collaborative system, and controls the voltage fluctuation at the user end within the non-inductive power consumption range of ≤±0.8%, completely eliminating the problem of chaotic load distribution.

[0044] Further, in one embodiment, the preset ratio includes a first preset ratio and a second preset ratio, wherein the first preset ratio is greater than the second preset ratio, and the step of controlling the load transfer of the master vehicle and the load transfer of the slave vehicle according to the preset ratio to realize master-slave disconnection and slave disconnection includes: The first preset proportion of the load on the main train is transferred to the distribution network, and the second preset proportion of the load on the main train is transferred to the slave train. At this time, the main grid connection switch is disconnected to achieve main train disconnection. When the slave vehicle receives a disconnection signal from the master vehicle, it controls the transfer of the slave vehicle's load to the distribution network. At this time, the slave vehicle's grid connection switch is disconnected to achieve slave disconnection.

[0045] In this embodiment of the application, the preset ratio includes a first preset ratio and a second preset ratio. The first preset ratio refers to the proportion of load transferred from the main generator to the distribution network, and the second preset ratio refers to the proportion of load transferred from the main generator to the slave generator. The specific values ​​of the first preset ratio and the second preset ratio can be determined according to actual needs. It is only necessary to satisfy that the first preset ratio is greater than the second preset ratio. There is no limitation here. For example, the first preset ratio can preferably be 80%, and the second preset ratio can preferably be 20%. Specifically, after the distribution network maintenance is completed, the system transfers the first preset proportion of load (e.g., 80%, 640kVA) from the main generator truck to the distribution network, and the second preset proportion of load (e.g., 20%, 160kVA) from the main generator truck to the slave generator truck. A three-phase parameter acquisition module with a 1kHz sampling frequency and a ≤15ms slip dynamic adjustment module monitor the phase difference, frequency difference, and voltage difference in real time to ensure that both remain stable within safe thresholds, avoiding inrush currents and system oscillations during load transfer. After the load transfer from the main generator truck is completed, the system disconnects the main grid-connected switch to achieve main grid disconnection, and simultaneously triggers the slave generator truck via a wireless communication module. The trolley disconnection signal; within 1 second of receiving the signal, the trolley precisely transfers all its load (including the second preset proportion load transferred from the main trolley and the original load) to the distribution network, and then disconnects the grid connection switch to achieve trolley disconnection. This master-slave coordinated disconnection mechanism is constrained by the timing of the master disconnection first transfer (≥80% of the total load) and the slave disconnection executed synchronously (response within 1 second), so that the distribution network load is always stably taken over by the distribution network or the slave trolley during the disconnection process, completely eliminating the "load vacuum" phenomenon, ensuring the power supply continuity requirement of voltage fluctuation ≤±0.8% at the user end, and meeting the "unimpeded power use" standard for uninterrupted power supply operation of medium and low voltage distribution networks.

[0046] Furthermore, in one embodiment, the method further includes: For both the master vehicle and the slave vehicle, if a target condition is detected, the grid connection switch is controlled to switch from a closed state to an open state. The target condition includes a real-time phase difference greater than a preset phase difference threshold, a real-time frequency difference greater than a preset frequency difference threshold, or a real-time voltage difference greater than a preset voltage difference threshold.

[0047] In an exemplary embodiment of this application, the system monitors in real time the phase difference, frequency difference, and voltage difference between the main generator vehicle and the distribution network, as well as the phase difference, frequency difference, and voltage difference between the slave generator vehicle and the distribution network, through a three-phase parameter acquisition module with a sampling frequency of 1kHz. When the real-time phase difference is detected to be greater than a preset phase difference threshold, the real-time frequency difference is greater than a preset frequency difference threshold, or the real-time voltage difference is greater than a preset voltage difference threshold, it is determined that the parameters are out of tolerance, resulting in a risk of excessive slip in the system. The system automatically triggers the "rapid disconnection + backup power supply" mechanism, switching the grid connection switch of the corresponding generator vehicle (main vehicle or slave vehicle) from the closed state to the open state, and simultaneously starting the backup battery on the generator vehicle (to maintain power supply to critical equipment) to avoid continuous oscillation of the distribution network. At the same time, the fault information is uploaded to the distribution network dispatching system in real time for timely handling by operation and maintenance personnel.

[0048] It should be noted that, taking the "10kV medium and low voltage distribution network residential area (total load 1200kVA) line maintenance" operation as an example, the automatic grid connection and disconnection control method of the mobile generator vehicle is applied: (1) Preparation before operation: Select one 1000kVA mobile generator vehicle (master vehicle) and one 500kVA mobile generator vehicle (slave vehicle), install a three-phase parameter acquisition-slip adjustment module, and establish a wireless communication channel between the master and slave vehicles.

[0049] (2) Grid connection process: The main vehicle starts the acquisition module and monitors the distribution network phase of 50.2°, frequency of 50.0Hz and voltage of 10.0kV in real time. It adjusts its own parameters to phase of 50.1° (difference of 0.1°), frequency of 50.05Hz (difference of 0.05Hz) and voltage of 9.9kV (difference of 1.0%), closes the main grid connection switch, and undertakes 800kVA load. When the peak electricity consumption of the community arrives, the total load rises to 1200kVA. The main vehicle sends a grid connection command to the slave vehicle. The slave vehicle adjusts its parameters to be consistent with the main vehicle and then connects to undertake 400kVA load.

[0050] (3) Disconnection process: After the maintenance is completed, the main vehicle transfers the 640kVA load to the distribution network and the 160kVA load to the slave vehicle, and disconnects the main grid connection switch; after receiving the signal, the slave vehicle transfers the 560kVA (400kVA+160kVA) load to the distribution network and disconnects the slave grid connection switch.

[0051] (4) Implementation effect: During the entire operation, the phase difference, frequency difference and voltage difference did not exceed the safety threshold, and there was no damage to the generator motor or distribution network oscillation; there was no "load vacuum" during the disconnection process, the voltage fluctuation at the user end was ≤ ±0.8%, and there was no short-term power outage, which fully met the "unimpeded power consumption" requirement and verified the effectiveness of this method.

[0052] Secondly, embodiments of this application also provide an automatic grid connection and disconnection control system for mobile generator vehicles.

[0053] In one embodiment, reference is made to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of the mobile generator automatic grid connection and disconnection control system of this application. Figure 3 As shown, the automatic grid connection and disconnection control system for mobile generator vehicles includes: The first processing module is used to control the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference and real-time main vehicle voltage difference. The second processing module is used to control the main vehicle to connect to the power distribution network and assume the first preset load when the main grid connection switch is closed; The third processing module is used to control the opening and closing of the grid-connected switch based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle. The fourth processing module is used to control the vehicle to connect to the power distribution network and assume a second preset load when the grid connection switch is closed, wherein the first preset load is greater than the second preset load; The fifth processing module is used to allocate the load between the master vehicle and slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate. The sixth processing module is used to control the load transfer of the master train and the slave train according to a preset ratio when the power distribution network maintenance is completed, so as to realize the master train disconnection and slave train disconnection.

[0054] Furthermore, in one embodiment, the first processing module is specifically used for: If the real-time main vehicle phase difference is not greater than the preset phase difference threshold, the real-time main vehicle frequency difference is not greater than the preset frequency difference threshold, and the real-time main vehicle voltage difference is not greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to close. If the real-time phase difference of the main vehicle is detected to be greater than the preset phase difference threshold, or the real-time frequency difference of the main vehicle is greater than the preset frequency difference threshold, or the real-time voltage difference of the main vehicle is greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to remain in the open state.

[0055] Furthermore, in one embodiment, the third processing module is specifically used for: If the real-time load rate of the master vehicle is greater than the preset load rate threshold, the grid connection switch will be turned on and off based on the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. If the real-time load rate of the main vehicle is not greater than the preset load rate threshold, the control will keep the grid connection switch in the off state.

[0056] Furthermore, in one embodiment, the third processing module is specifically used for: If the real-time phase difference between the slave vehicle and the vehicle is not greater than the preset phase difference threshold, the real-time frequency difference between the slave vehicle and the vehicle is not greater than the preset frequency difference threshold, and the real-time voltage difference between the slave vehicle and the vehicle is not greater than the preset voltage difference threshold, then the slave grid-connected switch is closed. If the real-time phase difference between the slave and vehicle is detected to be greater than a preset phase difference threshold, or the real-time frequency difference between the slave and vehicle is greater than a preset frequency difference threshold, or the real-time voltage difference between the slave and vehicle is greater than a preset voltage difference threshold, then the slave grid-connected switch is controlled to remain in the open state.

[0057] Furthermore, in one embodiment, the fifth processing module is specifically used for: The real-time load rate of the master vehicle and the real-time load rate of the slave vehicle are controlled by preset load rate thresholds to achieve load distribution between the master vehicle and the slave vehicle.

[0058] Further, in one embodiment, the preset ratio includes a first preset ratio and a second preset ratio, wherein the first preset ratio is greater than the second preset ratio, and the sixth processing module is specifically used for: The first preset proportion of the load on the main train is transferred to the distribution network, and the second preset proportion of the load on the main train is transferred to the slave train. At this time, the main grid connection switch is disconnected to achieve main train disconnection. When the slave vehicle receives a disconnection signal from the master vehicle, it controls the transfer of the slave vehicle's load to the distribution network. At this time, the slave vehicle's grid connection switch is disconnected to achieve slave disconnection.

[0059] Furthermore, in one embodiment, the first processing module is specifically used for: For both the master vehicle and the slave vehicle, if a target condition is detected, the grid connection switch is controlled to switch from a closed state to an open state. The target condition includes a real-time phase difference greater than a preset phase difference threshold, a real-time frequency difference greater than a preset frequency difference threshold, or a real-time voltage difference greater than a preset voltage difference threshold.

[0060] This application controls the opening and closing of the main grid-connected switch by measuring the real-time phase difference, frequency difference, and voltage difference of the main vehicle. When the main grid-connected switch is closed, the main vehicle is controlled to connect to the distribution network and assume the first preset load. The application also controls the opening and closing of the slave grid-connected switch based on the real-time load rate of the main vehicle, the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. These real-time parameters ensure that load fluctuations are captured instantaneously, preventing the allowable errors of phase difference, frequency difference, and voltage difference from exceeding safe limits, thereby avoiding damage to the generator or distribution network oscillations, and thus better controlling the opening and closing of the main and slave grid-connected switches. When the slave grid-connected switch is closed, the slave vehicle is controlled to connect to the distribution network and assume the second preset load. The first preset load is greater than the second preset load; the load distribution between the master vehicle and slave vehicle is based on the real-time master vehicle load rate and the real-time slave vehicle load rate to avoid load distribution chaos, so that the distribution network load always has a stable load-bearing body, completely eliminating the "load vacuum", thereby avoiding short-term power outages and meeting the demand for "seamless power use"; after the distribution network maintenance is completed, the master vehicle load transfer and slave vehicle load transfer are controlled according to the preset ratio to realize master disconnection and slave disconnection; this application reduces the chaos of manual operation through the timing mechanism of master grid connection, slave grid connection, load distribution, master disconnection and slave disconnection, adapts to the multi-vehicle collaborative scenario of medium and low voltage distribution networks, and indirectly improves the overall efficiency of uninterrupted power supply operation.

[0061] The functions of each module in the above-mentioned mobile generator automatic grid connection and disconnection control system correspond to the steps in the above-mentioned mobile generator automatic grid connection and disconnection control method embodiment, and their functions and implementation processes will not be described in detail here.

[0062] Thirdly, embodiments of this application provide an automatic grid connection and disconnection control device for mobile generator vehicles. The automatic grid connection and disconnection control device for mobile generator vehicles can be a personal computer (PC), a laptop computer, a server, or other devices with data processing capabilities.

[0063] Reference Figure 4 , Figure 4This is a schematic diagram of the hardware structure of the automatic grid connection and disconnection control device for mobile generators involved in the embodiments of this application. In the embodiments of this application, the automatic grid connection and disconnection control device for mobile generators may include a processor, a memory, a communication interface, and a communication bus.

[0064] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0065] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the automatic grid connection and disconnection control equipment of the mobile generator vehicle, as well as interfaces used for interconnecting the automatic grid connection and disconnection control equipment of the mobile generator vehicle with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0066] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0067] The processor can be a general-purpose processor, which can call the automatic grid connection and disconnection control program for mobile generator vehicles stored in the memory and execute the automatic grid connection and disconnection control method for mobile generator vehicles provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the automatic grid connection and disconnection control program for mobile generator vehicles is called can be referred to the various embodiments of the automatic grid connection and disconnection control method for mobile generator vehicles in this application, and will not be repeated here.

[0068] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0069] Fourthly, embodiments of this application also provide a readable storage medium.

[0070] The present application has a readable storage medium storing an automatic grid connection and disconnection control program for mobile generator vehicles, wherein when the mobile generator vehicle automatic grid connection and disconnection control program is executed by a processor, it implements the steps of the mobile generator vehicle automatic grid connection and disconnection control method described above.

[0071] The method implemented when the automatic grid connection and disconnection control program for mobile generators is executed can be referred to in various embodiments of the automatic grid connection and disconnection control method for mobile generators in this application, and will not be repeated here.

[0072] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0073] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0074] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0075] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0076] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0078] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for automatic grid connection and disconnection control of a mobile generator vehicle, characterized in that, The automatic grid connection and disconnection control method for the mobile generator vehicle includes: The main grid-connected switch is controlled based on the real-time phase difference, frequency difference, and voltage difference of the main vehicle. When the main grid connection switch is closed, the main vehicle is controlled to connect to the distribution network and assume the first preset load; The grid connection switch is controlled to open and close based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle. When the grid connection switch is closed, the vehicle is controlled to connect to the power distribution network and assume a second preset load, where the first preset load is greater than the second preset load. Load allocation between the master and slave vehicles is based on real-time master vehicle load rate and real-time slave vehicle load rate. When the power distribution network maintenance is completed, the load transfer of the master train and the slave train is controlled according to the preset ratio to realize the master train disconnection and slave train disconnection.

2. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 1, characterized in that, The method of controlling the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference, and real-time main vehicle voltage difference includes: If the real-time main vehicle phase difference is not greater than the preset phase difference threshold, the real-time main vehicle frequency difference is not greater than the preset frequency difference threshold, and the real-time main vehicle voltage difference is not greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to close. If the real-time phase difference of the main vehicle is detected to be greater than the preset phase difference threshold, or the real-time frequency difference of the main vehicle is greater than the preset frequency difference threshold, or the real-time voltage difference of the main vehicle is greater than the preset voltage difference threshold, then the main grid-connected switch is controlled to remain in the open state.

3. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 1, characterized in that, The method of controlling the opening and closing of the grid-connected switch based on the real-time load rate of the master vehicle, the real-time phase difference between the slave vehicles, the real-time frequency difference between the slave vehicles, and the real-time voltage difference between the slave vehicles includes: If the real-time load rate of the master vehicle is greater than the preset load rate threshold, the grid connection switch will be turned on and off based on the real-time phase difference, frequency difference, and voltage difference of the slave vehicle. If the real-time load rate of the main vehicle is not greater than the preset load rate threshold, the control will keep the grid connection switch in the off state.

4. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 3, characterized in that, The control of the grid-connected switch opening and closing based on real-time slave-vehicle phase difference, real-time slave-vehicle frequency difference, and real-time slave-vehicle voltage difference includes: If the real-time phase difference between the slave vehicle and the vehicle is not greater than the preset phase difference threshold, the real-time frequency difference between the slave vehicle and the vehicle is not greater than the preset frequency difference threshold, and the real-time voltage difference between the slave vehicle and the vehicle is not greater than the preset voltage difference threshold, then the slave grid-connected switch is closed. If the real-time phase difference between the slave and vehicle is detected to be greater than a preset phase difference threshold, or the real-time frequency difference between the slave and vehicle is greater than a preset frequency difference threshold, or the real-time voltage difference between the slave and vehicle is greater than a preset voltage difference threshold, then the slave grid-connected switch is controlled to remain in the open state.

5. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 1, characterized in that, The load allocation between the master and slave vehicles based on real-time master vehicle load rate and real-time slave vehicle load rate includes: The real-time load rate of the master vehicle and the real-time load rate of the slave vehicle are controlled by preset load rate thresholds to achieve load distribution between the master vehicle and the slave vehicle.

6. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 1, characterized in that, The preset ratio includes a first preset ratio and a second preset ratio, wherein the first preset ratio is greater than the second preset ratio. The step of controlling the load transfer of the master vehicle and the slave vehicle according to the preset ratio to achieve master-slave disconnection and slave disconnection includes: The first preset proportion of the load on the main train is transferred to the distribution network, and the second preset proportion of the load on the main train is transferred to the slave train. At this time, the main grid connection switch is disconnected to achieve main train disconnection. When the slave vehicle receives a disconnection signal from the master vehicle, it controls the transfer of the slave vehicle's load to the distribution network. At this time, the slave vehicle's grid connection switch is disconnected to achieve slave disconnection.

7. The automatic grid connection and disconnection control method for mobile generator vehicles as described in claim 1, characterized in that, The method further includes: For both the master vehicle and the slave vehicle, if a target condition is detected, the grid connection switch is controlled to switch from a closed state to an open state. The target condition includes a real-time phase difference greater than a preset phase difference threshold, a real-time frequency difference greater than a preset frequency difference threshold, or a real-time voltage difference greater than a preset voltage difference threshold.

8. An automatic grid connection and disconnection control system for a mobile generator vehicle, characterized in that, The automatic grid connection and disconnection control system for the mobile power generator includes: The first processing module is used to control the opening and closing of the main grid-connected switch based on the real-time main vehicle phase difference, real-time main vehicle frequency difference and real-time main vehicle voltage difference. The second processing module is used to control the main vehicle to connect to the power distribution network and assume the first preset load when the main grid connection switch is closed; The third processing module is used to control the opening and closing of the grid-connected switch based on the real-time load rate of the master vehicle, the real-time phase difference of the slave vehicle, the real-time frequency difference of the slave vehicle, and the real-time voltage difference of the slave vehicle. The fourth processing module is used to control the vehicle to connect to the power distribution network and assume a second preset load when the grid connection switch is closed, wherein the first preset load is greater than the second preset load; The fifth processing module is used to allocate the load between the master vehicle and slave vehicle based on the real-time master vehicle load rate and the real-time slave vehicle load rate. The sixth processing module is used to control the load transfer of the master train and the slave train according to a preset ratio when the power distribution network maintenance is completed, so as to realize the master train disconnection and slave train disconnection.

9. An automatic grid connection and disconnection control device for a mobile generator vehicle, characterized in that, The mobile generator automatic grid connection and disconnection control device includes a processor, a memory, and a mobile generator automatic grid connection and disconnection control program stored in the memory and executable by the processor. When the mobile generator automatic grid connection and disconnection control program is executed by the processor, it implements the steps of the mobile generator automatic grid connection and disconnection control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an automatic grid connection and disconnection control program for mobile generator vehicles, wherein when the automatic grid connection and disconnection control program for mobile generator vehicles is executed by a processor, it implements the steps of the automatic grid connection and disconnection control method for mobile generator vehicles as described in any one of claims 1 to 7.

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