Emergency power supply vehicle synchronous grid-connected interface method and system

Abstract

The invention relates to the technical field of electric power, and discloses a synchronous grid-connected interface method and system for an emergency power supply vehicle. In the invention, in order to avoid the conditions of adjusting redundancy and resource waste of the synchronizing instrument, when the phase difference is smaller than the minimum value of the phase difference threshold, whether the phase difference is close to the allowable range is obtained by comparing the phase difference with the second phase difference threshold, if so, the speed of the phase difference change rate is judged, and if the phase difference change rate is slow, the time is saved. And judging whether the speed is close to an allowable range or far away from the allowable range, and if the speed is close to the allowable range, enabling the phase difference between the power supply vehicle and the power grid to be naturally converged to the allowable range without starting an adjusting mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power, and specifically provides a method and system for the synchronization and grid connection interface of an emergency power supply vehicle. Background Art

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

[0003] The grid connection interface of an emergency power supply vehicle usually provides two methods: automatic switching and manual switching. In the automatic switching mode, when a grid fault or interruption occurs, the system will automatically start the emergency power supply vehicle and connect it to the grid. Manual switching usually requires staff to decide whether to activate the emergency power supply vehicle according to the situation. Whether it is manual switching or automatic switching, during the switching process, it is necessary to synchronize the voltage, frequency, and phase of the power supply vehicle and the grid to enable the power supply vehicle to be smoothly connected to the grid. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and system for the synchronization and grid connection interface of an emergency power supply vehicle, which can detect and adjust the two during docking to ensure safety.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A method for the synchronization and grid connection interface of an emergency power supply vehicle, including: Step 1, obtain the phases of the power supply vehicle and the grid. After taking the difference between the two and performing absolute value processing, the phase difference is obtained and recorded as the basis for subsequent judgment; Step 2, set the phase difference range threshold according to the reasonable range of the allowable phase difference when the power supply vehicle and the grid are docked; 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 grid is within the allowable range, and the power supply vehicle and the grid can be safely docked and connected to the grid. In this case, the synchroscope will automatically confirm that the power supply vehicle and the grid have been synchronized, and the power supply vehicle can be connected to the grid and provide backup power for it; 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 grid, resulting in the two not being fully synchronized. In this case, the synchroscope will activate the adjustment mechanism.

[0006] In some embodiments, when the synchroscope starts the adjustment mechanism, since the phase difference is obtained from the absolute value, the phase of the power supply vehicle may be greater than or less than the phase of the power grid. In this regard, when the phase of the power supply vehicle is greater than the phase of the power grid, the synchroscope starts the adjustment mechanism for reducing the phase, and gradually reduces 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 synchroscope starts the adjustment mechanism for increasing the phase, and gradually increases the phase of the power supply vehicle.

[0007] In some embodiments, when the phase difference is less than the minimum value of the phase difference range threshold, a second phase difference threshold is set. The 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 obtained according to the comparison result.

[0008] In some embodiments, 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 secondary 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 synchroscope starts the adjustment mechanism.

[0009] In some embodiments, the process of secondary judgment: set a detection period. The phase difference at the initial stage of the detection period is the phase difference that is greater than or equal to the second phase difference threshold at this time, denoted as the initial phase difference. After the end of the period, the phase difference is obtained again, denoted as the end phase difference. The end phase difference is subtracted from the initial phase difference, and after taking the absolute value, the phase difference change is obtained. The phase difference change is divided by the detection period to obtain the phase difference change rate; set a phase difference change rate threshold, and compare the phase difference change rate with the phase difference change rate threshold, and different responses are obtained according to the comparison result.

[0010] In some embodiments, 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, judge the magnitudes of the initial phase difference and the end phase difference. If the initial phase difference is greater than the end phase difference, it means that the slow change rate is slowly moving away from the allowable range. In this case, the synchroscope starts the adjustment mechanism. If the initial phase difference is less than the end phase difference, it means that the change rate is slowly moving closer to the allowable 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 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 synchroscope starts the adjustment mechanism.

[0011] In some embodiments, when the rate of change of the phase difference is less than or equal to the threshold value of the rate of change of the phase difference, according to the size of the difference from the largest to the smallest, it is divided into a first level with a slow rate of change, a second level with a slow rate of change, and a third level with a slow rate of change. The degree of difference in the first level is the largest, and the degree of difference in the third level is the smallest. The corresponding natural waiting synchronization time for the power supply vehicle to dock with the power grid is the longest for the first level and the shortest for the third level. Determine the level into which the rate of change of the phase difference in the above process falls, and take different responses according to different levels.

[0012] In some embodiments, if it is the third level with a slow rate of change, it means that the natural waiting synchronization time for the power supply vehicle to dock with the power grid is the shortest. In this case, no additional intervention is required; if it is the first or second level with a slow rate of change, it means that the natural waiting synchronization time for the power supply vehicle to dock with the power grid is long. In this case, the load is increased.

[0013] The present invention also provides the following technical solutions:

[0014] The present invention further provides an emergency power supply vehicle synchronization and grid connection interface system, including: a phase difference calculation module, which is used to obtain the phases of the power supply vehicle and the power grid, and after subtracting the two and performing absolute value processing, obtain the phase difference; a threshold setting module, which is used to set a phase difference range threshold according to the reasonable range of the allowable phase difference when the power supply vehicle is docked with the power grid; 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 supply vehicle and the power grid is within the allowable range, and the power supply vehicle and the power grid can be safely docked and grid-connected. In this case, the synchronizer 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 for it; 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 synchronizer will start an adjustment mechanism.

[0015] The present invention further provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above-mentioned emergency power supply vehicle synchronization and grid connection interface method.

[0016] The technical solutions provided by the present invention have the following beneficial effects compared with the prior art:

[0017] First, in the present invention, the phase difference is compared with the 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 docking and grid connection. On the contrary, it means that it is not within the allowable range and needs to be adjusted by the synchronizer.

[0018] Second, in the present invention, in order to avoid the situation of redundant adjustment of the synchroscope and wasting resources, when the phase difference is less than the minimum value of the phase difference threshold, it is determined whether it is close to the allowable range according to the comparison between the phase difference and the second phase difference threshold. If it is close, then the rate of change of the phase difference is judged. If the rate of change of the phase difference is slow, then it is judged whether this slowness is close to the allowable range or far from the allowable range. If it is slow and close to the allowable range, there is no need to start the adjustment mechanism, and the phase difference between the power supply vehicle and the power grid can converge naturally within the allowable range.

[0019] Third, in the present invention, on the premise that the rate of change of the phase difference is slow, the degree of slowness is classified. The slower the level is to the rate of change of the phase difference threshold, the shorter the natural convergence waiting time for synchronization is for the power supply vehicle and the power grid. Except for the level with the shortest time, operations of increasing the load are performed on other levels with relatively longer waiting times to reduce the waiting time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 is a schematic diagram of the module structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] It can be understood that the term "one" 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 other embodiments, the number of the element can be multiple. The term "one" cannot be understood as a limitation on the number.

[0024] The emergency power supply vehicle synchronization and grid connection interface method provided by the present invention, as Figure 1 and Figure 2 shown, includes the following steps:

[0025] First step, when the power grid system loses power and the power truck needs to provide backup power, the synchronizer is used to detect and obtain the phases of the power truck and the power grid. Subtract the phase of the power grid from the phase of the power truck, and after taking the absolute value, the phase difference between the power truck and the power grid is obtained. This phase difference is recorded as the basis for subsequent judgment. Although when the power truck is connected to the power grid in parallel, it is crucial to ensure the same voltage, matching frequency, and synchronous phase, and none of them can be missing. Because: The same voltage ensures that the voltage levels of the power truck and the power grid are the same, thus avoiding abnormal current flow and possible equipment damage. The matching frequency ensures that the output of the power truck is consistent with the frequency of the power grid. If the frequencies do not match, the current waveform in the power grid will not be able to stably receive the output of the power truck, which may lead to power grid instability or equipment damage. Even if the voltage and frequency match, if the phases are not synchronized, the currents of the power truck and the power grid may flow reversely, generating a huge impact current, causing equipment damage or affecting the stability of the power grid. Therefore, the coordination of the three is the prerequisite for ensuring parallel connection safety. Only when the voltage, frequency, and phase are completely matched can unstable current shocks be avoided, the safe operation of the power grid and electrical equipment be guaranteed, and the smooth connection between the power truck and the power grid be ensured. However, when the power truck is connected to the power grid, detecting only the phase difference can effectively replace the comprehensive detection of voltage, frequency, and phase. This is because the phase difference itself comprehensively reflects the matching of voltage and frequency. First, the consistency of voltage and frequency is usually automatically maintained by the design and control system of the power truck. Therefore, as long as the phases are synchronized, the voltage and frequency between the power truck and the power grid will basically not deviate greatly. Second, the detection of the phase difference directly reflects the synchronization between the power truck and the power grid and is the key factor in judging whether the two can be smoothly connected. If the phase difference is too large, even if the voltage and frequency match, the current may flow reversely or generate an impact current, resulting in instability and equipment damage. Therefore, by monitoring and adjusting the phase difference, it can be ensured that the current waveforms of the power truck and the power grid are completely synchronized, avoiding potential safety hazards caused by asynchronous phases. In short, through precise control of the phase difference, the coordination of voltage, frequency, and phase can be ensured, thus achieving the safe connection between the power truck and the power grid.

[0026] Second step, set the phase difference range threshold, which is the reasonable range of the phase difference allowed when the power truck is connected to the power grid. To determine the appropriate phase difference range threshold, it is necessary to refer to the technical parameters of the equipment, such as the adjustment ability of the control system of the power truck, the load fluctuation range of the power grid, and the phase error range in historical parallel connection data. The 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 truck and the power grid, as long as the deviation is within the phase difference range threshold, the power truck and the power grid can be smoothly 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] In the third step, compare the phase difference with the phase difference range threshold, and obtain different responses according to the comparison result. 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, indicating that the phase synchronization between the power vehicle and the power grid is good, and the power vehicle and the power grid can be safely docked and connected to the grid. In this case, the synchroscope will automatically confirm that the power vehicle and the power grid have completed synchronization, the current waveforms are exactly the same, and the power vehicle can be connected to the grid and provide backup power for it. If the phase difference does not fall within the phase difference range threshold, that is, the phase difference is less than the minimum value of the phase difference range threshold or greater than the maximum value of the phase difference range threshold, it indicates that there is a large phase deviation between the power vehicle and the power grid, resulting in incomplete synchronization between the two. In this case, the synchroscope will start the adjustment mechanism and take corresponding compensation measures to gradually reduce the phase difference. This adjustment process will continue until the phase difference returns to the allowable range, thus ensuring the completion of the synchronization between the power vehicle and the power grid. This automatic adjustment mechanism greatly simplifies the grid connection process and, by precisely controlling the phase difference, avoids the risk of equipment damage or grid instability caused by inconsistent phases. Through the effective control of the phase difference, not only can the smooth progress of the grid connection process be ensured, but also the safe operation of the power grid can be maximally guaranteed, avoiding sudden current surges or instability phenomena, and ensuring the stable operation of the power vehicle and the smooth connection to the power grid.

[0028] When the phase difference does not fall within the phase difference range threshold, whether it is 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 by taking the absolute value, the phase of the power vehicle may be greater than the phase of the power grid or less than the phase of the power grid. When the phase of the power vehicle is greater than the phase of the power grid, in this case, the output phase of the power vehicle is higher than the phase of the power grid, that is, the phase of the power vehicle is ahead of the phase of the power grid. To achieve phase synchronization, the synchroscope will start the adjustment mechanism of reducing the phase and gradually reduce the phase of the power vehicle. When the phase of the power vehicle is less than the phase of the power grid, in this case, the phase of the power vehicle lags behind the phase of the power grid, that is, the output phase of the power vehicle is delayed relative to the phase of the power grid. To solve this problem, the synchroscope will start the adjustment mechanism of increasing the phase and gradually increase the phase of the power vehicle.

[0029] In the above process, when 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. In the above steps, in the face of these two cases, the synchroscope starts the adjustment mechanism. Although this can effectively ensure the safety of the connection between the power vehicle and the power grid, starting the adjustment mechanism of the synchroscope too many times will also cause problems of redundant adjustment and waste of resources. Therefore, here further judgment is made on whether to start 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, 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 obtained according to the comparison results. 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 already very close. In this case, a secondary judgment of the phase difference is made. 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 synchroscope starts the adjustment mechanism. Secondary judgment process: When it is obtained that the phase difference is greater than or equal to the second phase difference threshold, a detection period is set. The phase difference at the beginning of the detection period is the phase difference greater than or equal to the second phase difference threshold at this time, denoted as the initial phase difference. After the end of the period, the phase difference is obtained again, denoted as the end phase difference. Subtract the initial phase difference from the end phase difference, and after taking the absolute value, the phase difference change is obtained. The phase difference change is divided by the detection period to obtain the phase difference change rate. Set the phase difference change rate threshold according to requirements, compare the phase difference change rate with the phase difference change rate threshold, and different responses are obtained according to the comparison results. 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 within the detection period is slow. In this case, judge the magnitudes of the initial phase difference and the end phase difference. If the initial phase difference is greater than the end phase difference, it means that the slow change rate is slowly moving away from the allowable range. In this case, the synchroscope starts the adjustment mechanism. If the initial phase difference is less than the end phase difference, it means that the change rate is slowly approaching the allowable range. In this case, the adjustment mechanism is not started. Because when the initial phase difference is less than the end phase difference, it means that within the detection period, the phase difference between the power supply vehicle and the power grid is changing in the direction of approaching synchronization. That is to say, the phase of the power supply vehicle is gradually approaching the phase of the power grid, thereby reducing the gap between the two. If the adjustment mechanism is started at this time, it may cause unnecessary adjustments, which will instead 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 on the system caused by frequent intervention. Therefore, in this case, not starting the adjustment mechanism is to avoid excessive adjustment and allow the system to continue to naturally converge to the synchronized state, thereby improving efficiency and saving resources. In short, when the initial phase difference is less than the end phase difference, the system is already steadily approaching synchronization and does not require additional intervention. If the phase difference change rate is greater than the phase difference change rate threshold, it means that the phase difference change rate within the detection period is fast, and a fast phase difference change rate means that it may quickly move away from the allowable range. In this case, the synchroscope starts the adjustment mechanism.

[0031] When the phase difference is greater than the maximum value of the phase difference range threshold, no additional judgment is made. Even if the phase difference is approaching the allowable range and the rate of change is slowly approaching the allowable range, the synchronizer still activates the adjustment mechanism, mainly considering the requirements of grid security and rapid response. Although the phase difference is slowly approaching the allowable range at this time, there is still a risk that the large phase difference will last for too long. The phase difference exceeding the maximum value of the phase difference range threshold means that the synchronization state between the power vehicle and the grid has deviated seriously. If not adjusted in time, even if the rate of change is slow, it may cause the phase difference to reverse and expand due to external interference or system fluctuations, affecting the safety of grid connection. In addition, even if the large phase difference changes slowly, it will increase the current impact at the moment of 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 activates the adjustment mechanism to avoid the risks brought by waiting for additional judgment. Compared with saving resources, the stability and safety of the grid are more important. Therefore, regardless of the trend of the phase difference change, the safe grid connection is always prioritized.

[0032] In the above process, when it is determined that the rate of change is slowly approaching the allowable range, the adjustment mechanism is not activated. The reason for judging the slow rate of change first is that the current state is already close to the allowable range. If the rate of change is fast, even if it is a change towards the allowable range, it is easy to exceed the allowable range due to the fast rate. Therefore, a slow rate of change is a necessary condition. The speed of the rate of change is obtained by comparing 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 a slow rate of change. Within the slow range, if the slowness can reach the upper limit of the slow range, then for the connection between the power vehicle and the grid, the natural waiting time for synchronization will relatively be shortened. On this basis, the degree of slowness of the rate of change within the slow range is further defined. The situation where the phase difference change rate is less than or equal to the phase difference change rate threshold is divided into the first-level slow rate of change, the second-level slow rate of change, and the third-level slow rate of change from large to small according to the degree of less than. The first level has the largest degree of less than, and the third level has the smallest degree of less than. The corresponding natural waiting time for synchronization between the power vehicle and the grid is the longest for the first level and the shortest for the third level. Determine the level into which the phase difference change rate in the above process falls, and take different responses according to different levels. If it is the third-level slow rate of change, it means that the natural waiting time for synchronization between the power vehicle and the grid is the shortest. In this case, no additional intervention is made. If it is the first-level or second-level slow rate of change, it means that the natural waiting time for synchronization between the power vehicle and the grid is long. In this case, the load is increased to shorten the natural waiting time for synchronization.

[0033] Generally speaking, during the process of connecting the power vehicle to the power grid, it is crucial to ensure the synchronization of voltage, frequency, and phase, among which phase synchronization is particularly critical. Through phase difference detection, the synchronization status between the power vehicle and the power grid can be effectively judged. When the phase difference is within the allowable range, the system can synchronize naturally without intervention; if it exceeds the range, the adjustment mechanism is activated to restore synchronization by adjusting the phase difference. To avoid redundant adjustments, the system introduces a change rate judgment mechanism, that is, it judges whether to start the adjustment according to the magnitude of the phase difference change rate. If the change rate is slow and changing towards the allowable range, the system will allow natural convergence and reduce intervention; otherwise, the adjustment mechanism is activated. Further, by dividing the change rate into different levels (the first level, the second level, and the third level), corresponding different intervention measures are adopted. When the change rate of the third level is slow, the waiting time is the shortest and no intervention is required; when the change rate of the first level or the second level is slow, the waiting time is longer, and the system will increase the load to accelerate synchronization, ensuring the smooth connection between the power vehicle and the power grid, improving the synchronization efficiency and ensuring the stability of the power grid.

[0034] Embodiments disclosed in the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. Embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section, and / or installed from a removable medium. When the computer program is executed by a central processing unit, the above-mentioned functions defined in the methods of the present application are performed. It should be noted that the above-mentioned computer-readable medium in the present 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 of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with 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 of the above. In the present application, a computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in conjunction with an instruction execution system, apparatus, or device. And in the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program codes. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, and the computer-readable medium can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program codes contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: a wireless section, a wire segment, an optical cable, RF, etc., or any suitable combination of the above.

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

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

Claims

1. A method for the synchronization and grid connection interface of an emergency power supply vehicle, characterized in that, Including: Step 1: Obtain the phases of the power vehicle and the power grid. After taking the difference between them and processing it through absolute value, the phase difference is obtained and recorded as the basis for subsequent judgment; Step 2: Set the phase difference range threshold according to the reasonable range of the allowable phase difference when the power vehicle is connected to the power grid; 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 vehicle and the power grid is within the allowable range, and the power vehicle and the power grid can be safely connected and synchronized. In this case, the synchroscope will automatically confirm that the power vehicle and the power grid have been synchronized, and the power 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, it indicates that there is a large phase deviation between the power vehicle and the power grid, resulting in the failure of the two to be fully synchronized. In this case, the synchroscope will start the adjustment mechanism.

2. The emergency power supply vehicle synchronization grid connection interface method according to claim 1, characterized in that When the synchroscope starts the adjustment mechanism, since the phase difference is obtained through absolute value, the phase of the power vehicle may be greater than the phase of the power grid or less than the phase of the power grid; in this regard, when the phase of the power vehicle is greater than the phase of the power grid, the synchroscope starts the adjustment mechanism for reducing the phase and gradually reduces the phase of the power vehicle; when the phase of the power vehicle is less than the phase of the power grid, the synchroscope starts the adjustment mechanism for increasing the phase and gradually increases the phase of the power vehicle.

3. The emergency power supply vehicle synchronization and grid connection interface method according to claim 1, characterized in that When the phase difference is less than the minimum value of the phase difference range threshold, set the second phase difference threshold, which is close to but less than the minimum value of the phase difference range threshold, compare the phase difference with the second phase difference threshold, and different responses are obtained according to the comparison results.

4. The emergency power supply vehicle synchronization grid connection interface method according to claim 3, wherein If the phase difference is greater than or equal to the second phase difference threshold, it means that the phases of the power vehicle and the power grid are close. In this case, a secondary judgment is made on the phase difference; If the phase difference is less than the second phase difference threshold, it means that the phases of the power vehicle and the power grid are not close. In this case, the synchroscope starts the adjustment mechanism.

5. The emergency power supply vehicle synchronization and grid connection interface method according to claim 4, wherein The process of secondary judgment: Set the detection period. The phase difference at the initial stage of the detection period is the phase difference that is greater than or equal to the second phase difference threshold at this time, denoted as the initial phase difference. After the end of the period, the phase difference is obtained again, denoted as the end phase difference. Subtract the initial phase difference from the end phase difference, and after taking the absolute value, the phase difference change is obtained. Divide the phase difference change by the detection period to obtain the phase difference change rate; Set the phase difference change rate threshold, compare the phase difference change rate with the phase difference change rate threshold, and different responses are obtained according to the comparison results.

6. The emergency power supply vehicle synchronization grid connection interface method according to claim 5, 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 within the detection period is slow. In this case, judge the magnitudes of the initial phase difference and the end phase difference. If the initial phase difference is greater than the end phase difference, it means that the slow change rate is slowly moving away from the allowable range. In this case, the synchroscope starts the adjustment mechanism. If the initial phase difference is less than the end phase difference, it means that the change rate is slowly moving closer to the allowable 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 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 synchroscope starts the adjustment mechanism.

7. The emergency power supply vehicle synchronization and grid connection interface method according to claim 6, characterized in that For the case where the rate of change of the phase difference is less than or equal to the threshold, according to the magnitude of the difference, it is divided from large to small into the slow rate of change of the first level, the slow rate of change of the second level, and the slow rate of change of the third level. The degree of difference in the first level is the largest, and the degree of difference in the third level is the smallest. The corresponding natural waiting synchronization time for the power truck and the power grid to dock is the longest for the first level and the shortest for the third level. Determine the level into which the rate of change of the phase difference in the above process falls, and take different responses according to different levels.

8. The emergency power supply vehicle synchronization and grid connection interface method according to claim 7, characterized in that, If it is the slow rate of change of the third level, it means that the natural waiting synchronization time for the power truck and the power grid to dock is the shortest. In this case, no additional intervention is required. If it is the slow rate of change of the first level or the second level, it means that the natural waiting synchronization time for the power truck and the power grid to dock is long. In this case, the load is increased.

9. The emergency power supply vehicle synchronization and grid connection interface system according to any one of claims 1-8, characterized in that, Including: A phase difference calculation module, which is used to obtain the phases of the power truck and the power grid, and after taking the difference between the two and performing absolute value processing, the phase difference is obtained; A threshold setting module, which is used to set a phase difference range threshold according to the reasonable range of the phase difference allowed when the power truck and the power grid are docked; 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 truck and the power grid is within the allowed range, and the power truck and the power grid can be safely docked and connected to the grid. In this case, the synchroscope will automatically confirm that the power truck and the power grid have completed synchronization, and the power truck can be connected to the grid and provide backup power for it. 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 truck and the power grid, resulting in the failure of the two to be fully synchronized. In this case, the synchroscope will start an adjustment mechanism.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement an emergency power truck synchronization and grid connection interface method according to any one of the above claims 1-8.

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