An emergency power vehicle synchronization grid connection interface method and system

Abstract

The application relates to the technical field of electric power, and discloses a synchronous grid-connection interface method and system for an emergency power supply vehicle. In the application, in order to avoid the adjustment redundancy of a synchronizer and the waste of resources, when the phase difference is less than the minimum value of a phase difference threshold value, whether the phase difference is close to an allowed range is obtained according to comparison between the phase difference and a second phase difference threshold value; if the phase difference is close to the allowed range, the change rate of the phase difference is judged; if the change rate of the phase difference is slow, whether the slow change rate is slow change close to the allowed range or slow change far from the allowed range is judged; if the slow change is close to the allowed range, the adjustment mechanism does not need to be started, and the phase difference between the power supply vehicle and the power grid can be naturally converged into the allowed range.

Description

Technical Field

[0001] This invention relates to the field of power technology, specifically to a method and system for synchronous grid connection of an emergency power supply vehicle. Background Technology

[0002] The emergency power vehicle synchronization grid connection interface refers to the interface and related equipment designed to ensure the safe, reliable, and stable connection of the emergency power vehicle's power output to the power grid system when the vehicle is connected to the grid. This interface is typically used by the emergency power vehicle to provide backup power, especially during power outages or grid failures, providing temporary power support to the grid. The design and operation of the grid connection interface must meet the synchronization, safety, and stability requirements of the power grid.

[0003] Emergency power supply vehicles typically offer two grid connection modes: automatic and manual. In automatic mode, the system automatically activates the emergency power supply vehicle and connects to the grid when a power grid fault or interruption occurs. Manual mode, however, usually requires personnel to decide whether to activate the emergency power supply vehicle based on the situation. Regardless of whether manual or automatic switching is used, the voltage, frequency, and phase of the power supply vehicle and the power grid must be synchronized during the switching process to ensure a smooth connection. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a method and system for synchronous grid connection of emergency power vehicles, so as to detect and adjust the two during docking to ensure safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for synchronizing and connecting an emergency power supply vehicle to the grid, comprising: Step 1, acquiring the phase of the power supply vehicle and the power grid, subtracting the phase of the two phases and processing the absolute value to obtain the phase difference, and recording this phase difference as a basis for subsequent judgment; Step 2, setting a phase difference range threshold according to a reasonable range of phase differences that are allowed when the power supply vehicle and the power grid are connected; Step 3, comparing the phase difference with the phase difference range threshold. If the phase difference falls within the phase difference range threshold, it means that the phase difference between the power supply vehicle and the power grid is within the allowable range, and the power supply vehicle and the power grid can be safely connected to the grid. In this case, the synchronizing instrument will automatically confirm that the power supply vehicle and the power grid have been synchronized, and the power supply vehicle can be connected to the grid and provide backup power; if the phase difference does not fall within the phase difference range threshold, it indicates that there is a large phase deviation between the power supply vehicle and the power grid, resulting in the two not being fully synchronized. In this case, the synchronizing instrument will activate an adjustment mechanism.

[0006] In some implementations, when the synchronizing instrument activates the adjustment mechanism, since the phase difference is obtained from an absolute value, the phase of the power supply vehicle may be greater than or less than the phase of the power grid. Therefore, when the phase of the power supply vehicle is greater than the phase of the power grid, the synchronizing instrument activates the phase-reducing adjustment mechanism to gradually reduce the phase of the power supply vehicle; when the phase of the power supply vehicle is less than the phase of the power grid, the synchronizing instrument activates the phase-increasing adjustment mechanism to gradually increase the phase of the power supply vehicle.

[0007] In some implementations, when the phase difference is less than the minimum value of the phase difference range threshold, a second phase difference threshold is set, which is close to but less than the minimum value of the phase difference range threshold. The phase difference is compared with the second phase difference threshold, and different responses are derived based on the comparison results.

[0008] In some implementations, if the phase difference is greater than or equal to the second phase difference threshold, it indicates that the phases of the power supply vehicle and the power grid are close. In this case, a second judgment is made on the phase difference. If the phase difference is less than the second phase difference threshold, it indicates that the phases of the power supply vehicle and the power grid are not close. In this case, the synchronizing instrument activates the adjustment mechanism.

[0009] In some implementations, the secondary judgment process is as follows: a detection period is set, and the initial phase difference of the detection period is the phase difference that is greater than or equal to the second phase difference threshold at this time, which is recorded as the initial phase difference. After the period ends, the phase difference is acquired again and recorded as the ending phase difference. The phase difference change is obtained by subtracting the initial phase difference from the ending phase difference and performing absolute value processing. The phase difference change rate is obtained by dividing the phase difference change rate by the detection period. A phase difference change rate threshold is set, and the phase difference change rate is compared with the phase difference change rate threshold. Different responses are given based on the comparison results.

[0010] In some implementations, if the phase difference change rate is less than or equal to the phase difference change rate threshold, it indicates that the phase difference change rate within the detection period is slow. In this case, the magnitudes of the initial and final phase differences are determined. If the initial phase difference is greater than the final phase difference, it means that the slow change rate is slowly moving away from the allowable range. In this case, the synchronizer activates the adjustment mechanism. If the initial phase difference is less than the final phase difference, it means that the change rate is slowly moving towards the allowable range. In this case, the adjustment mechanism is not activated. If the phase difference change rate is greater than the phase difference change rate threshold, it indicates that the phase difference change rate within the detection period is fast. A fast phase difference change rate means that it will quickly move away from the allowable range. In this case, the synchronizer activates the adjustment mechanism.

[0011] In some implementations, cases where the phase difference change rate is less than or equal to a threshold are categorized into three levels based on the magnitude of the difference: Level 1 (slowest rate of change), Level 2 (slowest rate of change), and Level 3 (slowest rate of change). Level 1 represents the largest degree of difference, while Level 3 represents the smallest degree of difference. The corresponding natural waiting time for synchronization between the power supply vehicle and the power grid is determined, with Level 1 having the longest waiting time and Level 3 having the shortest. The level to which the phase difference change rate falls in the above process is then determined, and different responses are taken based on the different levels.

[0012] In some implementations, if the rate of change at level three is slow, it means that the natural waiting time for the power supply vehicle and the power grid to connect and synchronize is the shortest. In this case, no additional intervention is required. If the rate of change at level one or two is slow, it means that the natural waiting time for the power supply vehicle and the power grid to connect and synchronize is long. In this case, the load is increased.

[0013] This invention also provides the following technical solutions:

[0014] This invention further provides an emergency power vehicle synchronization and grid connection interface system, comprising: a phase difference calculation module, which is used to acquire the phase of the power vehicle and the power grid, and obtain the phase difference by subtracting the two and then processing the absolute value; a threshold setting module, which is used to set a phase difference range threshold according to a reasonable range of phase difference allowed when the power vehicle and the power grid are connected; and a comparison and response module, which is used to compare the phase difference with the phase difference range threshold. If the phase difference falls within the phase difference range threshold, it means that the phase difference between the power vehicle and the power grid is within the allowable range, and the power vehicle and the power grid can be safely connected to the grid. In this case, the synchronizing instrument will automatically confirm that the power vehicle and the power grid have been synchronized, and the power vehicle can be connected to the grid and provide backup power. If the phase difference does not fall within the phase difference range threshold, it indicates that there is a large phase deviation between the power vehicle and the power grid, resulting in the two not being fully synchronized. In this case, the synchronizing instrument will activate an adjustment mechanism.

[0015] The present invention further provides a computer-readable storage medium storing a computer program, which is executed by a processor to implement the above-described method for synchronous grid connection of an emergency power supply vehicle.

[0016] The technical solution provided by this invention has the following advantages compared with the prior art:

[0017] Firstly, in this invention, the phase difference is compared with a phase difference range threshold. If the phase difference falls within the phase difference range threshold, it indicates that the phase difference between the power supply vehicle and the power grid is within the allowable range and does not affect their connection to the grid. Conversely, if the phase difference is outside the allowable range, it indicates that adjustment is required using a synchronizing device.

[0018] Secondly, in this invention, to avoid redundant adjustment of the synchronizing instrument and waste of resources, when the phase difference is less than the minimum value of the phase difference threshold, the comparison between the phase difference and the second phase difference threshold determines whether it is close to the allowable range. If it is close, the rate of change of the phase difference is then judged. If the rate of change of the phase difference is slow, it is then judged whether this slowness is close to the allowable range or far from the allowable range. If it is close to the allowable range, there is no need to activate the adjustment mechanism, and the phase difference between the power supply vehicle and the power grid can be allowed to naturally converge to the allowable range.

[0019] Thirdly, in this invention, under the premise of slow phase difference change rate, the degree of slowness is classified. The slower the slow level is closer to the phase difference change rate threshold, the shorter the natural convergence waiting time for the power supply vehicle and the power grid. Except for the level with the shortest time, the other levels with relatively long waiting time are operated by increasing the load to reduce the waiting time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the logic method of the present invention;

[0021] Figure 2 This is a schematic diagram of the module structure of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0024] The emergency power supply vehicle synchronous grid connection interface method provided by this invention, such as... Figure 1 and Figure 2 As shown, it includes the following steps:

[0025] The first step involves detecting the phase difference between the power supply vehicle and the grid when the mains system experiences a power outage and the power supply vehicle needs to provide backup power. This phase difference is obtained by subtracting the grid phase from the power supply vehicle phase and processing the absolute value. This phase difference is recorded as a basis for subsequent judgments. Ensuring voltage consistency, frequency matching, and phase synchronization is crucial when connecting the power supply vehicle to the grid; all three are indispensable. This is because: voltage consistency ensures that the voltage levels of the power supply vehicle and the grid are the same, thus avoiding abnormal current flow and potential equipment damage. Frequency matching ensures that the power supply vehicle's output frequency matches the grid frequency. If the frequency does not match, the current waveform in the grid will not be able to stably receive the power supply vehicle's output, potentially leading to grid instability or equipment damage. Even with voltage and frequency matching, if the phase is not synchronized, the current in the power supply vehicle and the grid may flow in opposite directions, generating a large inrush current that can damage equipment or affect grid stability. Therefore, the coordination of these three factors is a prerequisite for ensuring grid connection safety. Only when voltage, frequency, and phase are perfectly matched can unstable current surges be avoided, ensuring the safe operation of the power grid and electrical equipment, and ensuring a smooth connection between the power supply vehicle and the grid. However, when the power supply vehicle connects to the grid, detecting only the phase difference can effectively replace a comprehensive detection of voltage, frequency, and phase. This is because the phase difference itself integrates the matching of voltage and frequency. First, the consistency of voltage and frequency is usually maintained automatically by the design and control system of the power supply vehicle. Therefore, as long as the phase is synchronized, the voltage and frequency of the power supply vehicle and the grid will not deviate significantly. Second, the detection of the phase difference directly reflects the synchronization between the power supply vehicle and the grid, and is a key factor in determining whether they can be smoothly connected. If the phase difference is too large, even if the voltage and frequency are matched, the current may flow in reverse or generate surge current, leading to instability and equipment damage. Therefore, by monitoring and adjusting the phase difference, it is possible to ensure that the current waveforms of the power supply vehicle and the grid are completely synchronized, avoiding safety hazards caused by phase asynchrony. In short, through precise control of the phase difference, the coordination of voltage, frequency, and phase can be ensured, thereby achieving a safe connection between the power supply vehicle and the grid.

[0026] The second step is to set a phase difference range threshold. This threshold represents the reasonable range of phase difference allowed when the power supply vehicle and the power grid are connected. To determine a suitable phase difference range threshold, it is necessary to refer to the technical parameters of the equipment, such as the adjustment capability of the power supply vehicle's control system, the load fluctuation range of the power grid, and the phase error range in historical grid connection data. This phase difference range threshold is set with a minimum and a maximum value to ensure that even if there is a slight deviation in the synchronization between the power supply vehicle and the power grid, as long as the deviation is within the phase difference range threshold, the power supply vehicle and the power grid can be successfully connected. If the phase difference exceeds this range, unstable current fluctuations will occur, affecting the stability of the power grid and the safety of electrical equipment.

[0027] The third step involves comparing the phase difference with a phase difference range threshold and determining different responses based on the comparison results. If the phase difference falls within the threshold, it means the phase difference between the power supply vehicle and the grid is within the allowable range, indicating good phase synchronization between them. In this case, the synchronizing instrument automatically confirms that the power supply vehicle and the grid have completed synchronization, with completely identical current waveforms. The power supply vehicle can then be connected to the grid and provide backup power. If the phase difference does not fall within the threshold (i.e., the phase difference is less than the minimum or greater than the maximum), it indicates a significant phase deviation between the power supply vehicle and the grid, preventing complete synchronization. In this case, the synchronizing instrument activates an adjustment mechanism, taking corresponding compensation measures to gradually reduce the phase difference. This adjustment process continues until the phase difference returns to the allowable range, ensuring synchronization between the power supply vehicle and the grid. This automated adjustment mechanism greatly simplifies the grid connection process and, through precise phase difference control, avoids the risk of equipment damage or grid instability caused by inconsistent phases. Effective control of phase difference not only ensures the smooth progress of grid connection, but also maximizes the safe operation of the power grid, avoids sudden current surges or instability, and ensures the stable operation of the power supply vehicle and its smooth connection with the power grid.

[0028] When the phase difference does not fall within the phase difference range threshold, it is either less than the minimum value of the phase difference range threshold or greater than the maximum value of the phase difference range threshold. Since the phase difference is obtained from an absolute value, the power supply vehicle phase may be greater than or less than the grid phase. When the power supply vehicle phase is greater than the grid phase, the output phase of the power supply vehicle is higher than the grid phase, meaning the power supply vehicle phase is ahead of the grid phase. To achieve phase synchronization, the synchronizer will activate a phase reduction adjustment mechanism, gradually reducing the power supply vehicle phase. When the power supply vehicle phase is less than the grid phase, the phase of the power supply vehicle lags behind the grid phase, meaning the output phase of the power supply vehicle is delayed relative to the grid phase. To solve this problem, the synchronizer will activate a phase increase adjustment mechanism, gradually increasing the power supply vehicle phase.

[0029] In the above process, when the phase difference does not fall within the phase difference range threshold, there are two scenarios: either the phase difference is less than the minimum value of the phase difference range threshold, or the phase difference is greater than the maximum value of the phase difference range threshold. In both of these scenarios, the synchronizing instrument activates its adjustment mechanism. While this effectively ensures the safe connection between the power supply vehicle and the power grid, excessive activation of the adjustment mechanism by the synchronizing instrument can lead to redundant adjustments and wasted resources. Therefore, a further determination is needed here regarding whether to activate the adjustment mechanism.

[0030] When the phase difference is less than the minimum value of the phase difference range threshold, a second phase difference threshold is set. This second phase difference threshold is close to but less than the minimum value of the phase difference range threshold. The phase difference is compared with the second phase difference threshold, and different responses are given based on the comparison result. If the phase difference is greater than or equal to the second phase difference threshold, it means that the phase of the power supply vehicle and the power grid is very close. In this case, a second judgment is made on the phase difference. If the phase difference is less than the second phase difference threshold, it means that the phase of the power supply vehicle and the power grid is not close. In this case, the synchronizing instrument activates the adjustment mechanism. Second judgment process: When it is found that the phase difference is greater than or equal to the second phase difference threshold, a detection cycle is set. The initial phase difference of the detection cycle is the phase difference that is greater than or equal to the second phase difference threshold at this time, which is recorded as the initial phase difference. After the cycle ends, the phase difference is acquired again and recorded as the ending phase difference. The phase difference change is obtained by subtracting the initial phase difference from the ending phase difference and performing absolute value processing. The phase difference change rate is obtained by dividing the phase difference change by the detection cycle. A phase difference change rate threshold is set according to the requirements, and the phase difference change rate is compared with the phase difference change rate threshold. Different responses are given based on the comparison result. If the phase difference change rate is less than or equal to the phase difference change rate threshold, it indicates that the phase difference change rate within the detection period is slow. In this case, the initial and final phase differences are compared. If the initial phase difference is greater than the final phase difference, it means the slow change rate is moving slowly away from the allowable range. In this case, the synchronizer activates the adjustment mechanism. If the initial phase difference is less than the final phase difference, it means the change rate is slowly approaching the allowable range. In this case, the adjustment mechanism is not activated. This is because when the initial phase difference is less than the final phase difference, it indicates that the phase difference between the power supply vehicle and the power grid is changing towards synchronization within the detection period. That is, the phase of the power supply vehicle is gradually approaching the phase of the power grid, thus reducing the gap between them. Activating the adjustment mechanism at this time may lead to unnecessary adjustments, which could disrupt the synchronization process between the power supply vehicle and the power grid. Since the phase difference is already decreasing and the change rate is slow, maintaining the current state helps to achieve synchronization naturally, avoiding the burden of frequent intervention on the system. Therefore, in this case, the adjustment mechanism is not activated to avoid over-adjustment and allow the system to continue to converge naturally to the synchronized state, thereby improving efficiency and saving resources. In short, when the initial phase difference is less than the final phase difference, the system is steadily approaching synchronization without additional intervention. If the rate of change of phase difference exceeds the threshold, it indicates a rapid rate of change of phase difference within the detection period, which means it may quickly deviate from the allowable range. In this case, the synchronizer activates its adjustment mechanism.

[0031] When the phase difference exceeds the maximum value of the phase difference range threshold, no additional judgment is made. Even if the phase difference is close to the allowable range and the rate of change is slowly approaching the allowable range, the synchronizing instrument still initiates the adjustment mechanism, primarily for grid security and rapid response requirements. Although the phase difference is slowly approaching the allowable range at this time, there is still a risk of a large phase difference lasting too long. A phase difference exceeding the maximum value of the phase difference range threshold means that the synchronization state between the power supply vehicle and the grid has deviated significantly. If not adjusted in time, even a slow rate of change may cause the phase difference to widen in the opposite direction due to external interference or system fluctuations, affecting grid connection safety. Furthermore, an excessively large phase difference, even if it changes slowly, will increase the current surge during grid connection, threatening the safety of grid equipment. Therefore, when the phase difference exceeds the maximum value of the phase difference range threshold, the system directly initiates the adjustment mechanism to avoid the risks associated with waiting for additional judgment. Compared to saving resources, grid stability and security are more important; therefore, regardless of the trend of phase difference changes, ensuring safe grid connection is always the priority.

[0032] In the above process, when the rate of change is determined to be slow and approaching the allowable range, the adjustment mechanism is not activated. The reason for initially determining the rate of change to be slow is that the state is already close to the allowable range. If the rate of change were fast, even if the change is moving towards the allowable range, it could easily exceed the allowable range due to the rapid rate. Therefore, a slow rate of change is a necessary condition. The speed of change is determined by comparing it with the phase difference change rate threshold. Only when the phase difference change rate is less than or equal to the phase difference change rate threshold is it considered slow. Within the slow range, if the slowness reaches the upper limit, the synchronization waiting time for the power supply vehicle and the power grid will naturally be shortened. Based on this, the degree of slowness within the slow range is further defined. Cases less than or equal to the phase difference change rate threshold are categorized into three levels of slowness, from largest to smallest: Level 1, Level 2, and Level 3. Level 1 has the largest degree of slowness, and Level 3 has the smallest. Correspondingly, Level 1 has the longest synchronization waiting time for the power supply vehicle and the power grid, and Level 3 has the shortest. Determine the level of the phase difference change rate in the above process and take different actions based on the level. If the change rate is slow at level three, it means the natural waiting time for the power supply vehicle and the grid to synchronize is the shortest; in this case, no additional intervention is needed. If the change rate is slow at level one or two, it means the natural waiting time for the power supply vehicle and the grid to synchronize is long; in this case, increase the load to shorten the natural waiting time for synchronization.

[0033] In summary, ensuring the synchronization of voltage, frequency, and phase is crucial during the grid connection of the power supply vehicle, with phase synchronization being particularly critical. Phase difference detection effectively determines the synchronization status between the power supply vehicle and the grid. When the phase difference is within the allowable range, the system can synchronize naturally without intervention; if it exceeds the range, an adjustment mechanism is activated to restore synchronization by adjusting the phase difference. To avoid redundant adjustments, the system introduces a rate-of-change judgment mechanism, which determines whether to activate adjustment based on the magnitude of the phase difference change rate. If the rate of change is slow and moving towards the allowable range, the system will allow natural convergence, reducing intervention; otherwise, the adjustment mechanism will be activated. Furthermore, the rate of change is divided into different levels (Level 1, Level 2, and Level 3), corresponding to different intervention measures. At Level 3, the waiting time is the shortest, requiring no intervention; at Level 1 or Level 2, the waiting time is longer, and the system will increase the load to accelerate synchronization, ensuring smooth connection between the power supply vehicle and the grid, improving synchronization efficiency, and guaranteeing grid stability.

[0034] The processes described above with reference to the flowcharts in the embodiments disclosed in this invention can be implemented as computer software programs. Embodiments of this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by a central processing unit, it performs the functions defined in the methods of this application. It should be noted that the computer-readable medium described above in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection having one or more wire segments, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless segments, wire segments, optical cables, RF, etc., or any suitable combination thereof.

[0035] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0036] Those skilled in the art should understand that the above description is only a specific embodiment of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. An emergency power vehicle synchronization and grid tie interface method, comprising: The method comprises the following steps: Step 1: Obtain the phase of the power supply vehicle and the power grid, and obtain the phase difference by taking the absolute value of the difference between the two; record the phase difference as a subsequent judgment basis; Step 2: Set a phase difference range threshold according to the reasonable range of the phase difference allowed when the power supply vehicle and the power grid are connected; Step 3: Compare the phase difference with the phase difference range threshold; if the phase difference falls within the phase difference range threshold, it means that the phase difference between the power supply vehicle and the power grid is within the allowed range, and the power supply vehicle and the power grid can be safely connected and synchronized; in this case, the synchronizer automatically confirms that the power supply vehicle and the power grid have completed synchronization, and the power supply vehicle can be connected to the power grid and provide backup power for it; if the phase difference does not fall within the phase difference range threshold, there are two cases: one is that the phase difference is less than the minimum value of the phase difference range threshold, and the other is that the phase difference is greater than the maximum value of the phase difference range threshold; when the phase difference is less than the minimum value of the phase difference range threshold, set a second phase difference threshold close to but less than the minimum value of the phase difference range threshold, and compare the phase difference with the second phase difference threshold; according to the comparison result, different responses are obtained; If the phase difference is greater than or equal to the second phase difference threshold, it means that the phases of the power supply vehicle and the power grid are close; in this case, the phase difference is judged again: set a detection period, the initial phase difference in the detection period is the phase difference greater than or equal to the second phase difference threshold at this time, recorded as the initial phase difference; after the detection period ends, the phase difference is obtained again, recorded as the end phase difference; the phase difference change is obtained by subtracting the initial phase difference from the end phase difference and taking the absolute value; the phase difference change rate is obtained by dividing the phase difference change by the detection period; Set a phase difference change rate threshold, and compare the phase difference change rate with the phase difference change rate threshold; according to the comparison result, different responses are obtained; If the phase difference is less than the second phase difference threshold, it means that the phases of the power supply vehicle and the power grid are not close; in this case, the synchronizer starts the adjustment mechanism; when the phase difference is greater than the maximum value of the phase difference range threshold, the synchronizer starts the adjustment mechanism.

2. The emergency power vehicle synchronization and grid tie interface method of claim 1, wherein, When the synchronizer starts the adjustment mechanism, the phase difference is obtained by taking the absolute value, so the phase of the power supply vehicle may be greater than or less than the phase of the power grid; for this, when the phase of the power supply vehicle is greater than the phase of the power grid, the synchronizer starts the phase reduction adjustment mechanism to gradually reduce the phase of the power supply vehicle; when the phase of the power supply vehicle is less than the phase of the power grid, the synchronizer starts the phase increase adjustment mechanism to gradually increase the phase of the power supply vehicle.

3. The emergency power vehicle synchronization and grid tie interface method of claim 2, wherein, If the phase difference change rate is less than or equal to the phase difference change rate threshold, it means that the phase difference change rate in the detection period is slow; in this case, the sizes of the initial phase difference and the end phase difference are judged; if the initial phase difference is greater than the end phase difference, it means that the slow change rate is slow away from the allowed range; in this case, the synchronizer starts the adjustment mechanism; if the initial phase difference is less than the end phase difference, it means that the change rate is slow to approach the allowed range; in this case, the adjustment mechanism is not started. If the phase difference change rate is greater than the phase difference change rate threshold, it means that the phase difference change rate in the detection period is fast, and the fast phase difference change rate means that it will quickly move away from the allowed range. In this case, the synchronizer starts the adjustment mechanism.

4. The emergency power vehicle synchronization and grid tie interface method of claim 3, wherein, If the phase difference change rate is less than or equal to the phase difference change rate threshold, it is divided into a first level of slow change rate, a second level of slow change rate, and a third level of slow change rate according to the size of the less than from large to small. The first level is the largest, and the third level is the smallest. The corresponding time for the natural waiting synchronization of the power car and the power grid is the longest first level waiting time, and the shortest third level waiting time. Determine the level of the phase difference change rate in the above process, and respond differently according to different levels.

5. The emergency power vehicle synchronization and grid tie interface method of claim 4, wherein, If it is the third level of slow change rate, it means that the natural waiting synchronization time of the power car and the power grid is the shortest. In this case, no additional intervention is made; if it is the first or second level of slow change rate, it means that the natural waiting synchronization time of the power car and the power grid is long. In this case, the load is increased.

6. An emergency power vehicle synchronization and grid tie interface system for performing the method of any one of claims 1-5, wherein, Comprise: a phase difference calculation module for obtaining the phases of the power car and the power grid, and the difference between the two is obtained after absolute value processing to obtain the phase difference; a threshold setting module for setting the phase difference range threshold according to the reasonable range of the phase difference allowed when the power car and the power grid are connected; a comparison and response module for comparing the phase difference with the phase difference range threshold. If the phase difference falls within the phase difference range threshold, it means that the phase difference between the power car and the power grid is within the allowed range, and the power car and the power grid can be safely connected and networked. In this case, the synchronizer automatically confirms that the power car and the power grid have completed synchronization, and the power car can be connected to the power grid and provide backup power; if the phase difference does not fall within the phase difference range threshold, it means that there is a large phase difference between the power car and the power grid, resulting in the two not being completely synchronized. In this case, the synchronizer will start the adjustment mechanism.

7. A computer readable storage medium characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to realize the emergency power car synchronization and network interface method of any one of claims 1-5.

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