Dynamic three-phase balance orderly charging intelligent alternating current charging device

Abstract

The invention discloses a dynamic three-phase balance orderly charging intelligent alternating current charging device, relates to the technical field of three-phase balance, and solves the problem that the precision of a specific regulation and control mode needs to be improved due to the fact that whether three phases belong to a single-phase abnormal state or a multi-phase abnormal state is not confirmed in advance. According to the invention, the abnormal single-phase operation voltage is adjusted in real time; the running voltage difference value is equally distributed to the other two phases, so that the three phases quickly reach a load balance state; the adjusting mode is high in pertinence, the problem of load unbalance caused by single-phase abnormity can be rapidly solved on the premise that the operation stability of the whole power system is not affected, the risk of damage to equipment caused by overweight single-phase load is effectively reduced, the service life of the power equipment is prolonged, the reliability of the power equipment is improved, and dynamic adjustment of the three-phase load is achieved. The difference among three-phase loads is effectively reduced, and the problems of overlarge current, voltage fluctuation and the like caused by imbalance of the three-phase loads are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of three-phase balance, and particularly to a dynamic three-phase balance orderly charging intelligent AC charging device. Background Art

[0002] "Dynamic three-phase balance" is an important concept in the power field. It focuses on solving the problem of unbalanced loads in a three-phase power system and strives to continuously ensure the balanced state of the three phases during system operation. In an actual power system, the types of connected loads are diverse; for example, in residential electricity consumption, a large number of single-phase electrical appliances (such as air conditioners, TVs, refrigerators, etc.) are randomly connected to one of the three phases, making it difficult to evenly distribute the three-phase loads.

[0003] The application with the publication number CN109756010A discloses a dynamic three-phase balance control method. When a charging pile is in use, in combination with the current usage situation of the three-phase electricity in the current system, the phase used by the charging pile to be charged is dynamically allocated to solve the problem of three-phase imbalance caused by the AC charging system of multiple charging piles. The technical solution adopted by the present invention to solve its technical problems is: a three-phase dynamic balance control method for a master-slave architecture AC charging system, obtaining the real-time output current of each phase of the three-phase electricity at a certain period, monitoring the loads connected to the three-phase electricity and the current flowing into each load, setting an adjustment threshold for the three-phase electricity, and when the current difference between two phases is greater than the adjustment threshold according to the magnitude of the total output current of each phase at the current moment, dynamically switching the loads connected to the corresponding phase to achieve the purpose of three-phase balance.

[0004] Regarding the process of dynamic three-phase load balance processing for AC charging, directly based on the monitoring results of the corresponding phase, using the set control method to control the specified phase. However, the original such control method does not confirm in advance whether the three phases are in a single-phase abnormal or multi-phase abnormal state, resulting in the need to improve the accuracy of the specific control method, and in the actual control process, it will cause the working voltage of the operating circuit to change, resulting in large fluctuations in the line. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a dynamic three-phase balance orderly charging intelligent AC charging device, which solves the problem that the accuracy of the specific control method needs to be improved because it does not confirm in advance whether the three phases are in a single-phase abnormal or multi-phase abnormal state.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A dynamic three-phase balance orderly charging intelligent AC charging device, comprising:

[0007] A three-phase amplitude monitoring terminal, which monitors the voltage amplitudes of the three phases in real time and transmits the real-time monitored voltage amplitudes of the three phases into the load abnormality assessment terminal;

[0008] The load abnormality evaluation terminal, based on the voltage amplitudes monitored for the three phases at corresponding moments, confirms the total characteristic of the three-phase amplitudes associated with the corresponding moments, compares the confirmed total characteristic of the three-phase amplitudes with a set value, confirms the comparison result, and evaluates whether there is an abnormal phase based on the comparison result. The specific method is as follows:

[0009] Calibrate the voltage amplitudes monitored for different phases at the corresponding moment as F i , where i represents different phases and i = 1, 2, 3. Sum up multiple groups of voltage amplitudes F i monitored at the corresponding moment to confirm the total amplitude value ZH;

[0010] If ZH ≠ 0, then take the absolute value of multiple groups of voltage amplitudes F i associated with the current moment, confirm the maximum absolute value, and denote it as J i , and use: |ZH| ÷ J i = PD i to confirm the evaluation value PD i , and identify whether the confirmed evaluation value PD i satisfies: PD i ≥ 30%. If it is satisfied, it means that the three-phase load is abnormal, and a three-phase load abnormal signal is directly generated for display. If it is not satisfied, the amplitude waveform analysis terminal is executed to perform relevant analysis on the amplitude;

[0011] If ZH = 0, it means that the three-phase load is balanced, no processing is required, and continuous monitoring can be carried out;

[0012] The amplitude waveform analysis terminal confirms the amplitude waveforms generated by the three phases in the past period. From multiple different amplitude waveforms, select the amplitude zero point associated with a certain group of amplitude waveforms. Based on the amplitude zero point, confirm the amplitude differences associated with other amplitude waveforms at the corresponding moment. Based on the specific confirmation results, lock whether the three phases belong to single-phase abnormality or multi-phase abnormality. The specific method is as follows:

[0013] Confirm the amplitude waveforms generated by the three phases in the past period. Randomly select a certain group of amplitude waveforms as the associated waveform. Randomly select a group of amplitude zero points from the associated waveform, select the specific moment associated with this amplitude zero point, denote the specific moment as the zero point moment, and denote the amplitudes associated with the other two groups of amplitude waveforms at the zero point moment as F1 and F2. Confirm whether F1 and F2 satisfy: |F1| - |F2| ≤ Y1, where Y1 is a preset value representing the maximum amplitude difference value. If it is satisfied, it means that the three phases belong to single-phase abnormality, and denote the phase associated with the associated waveform as the abnormal single phase. If it is not satisfied, continue with the subsequent analysis;

[0014] Select another group of amplitude waveforms and denote them as associated waveforms, and use the same method as above to confirm the amplitude difference. If the amplitude difference values associated with the other two groups of amplitude waveforms meet the evaluation criteria, it means that the three phases belong to single-phase abnormality, and the phase associated with the current associated waveform is denoted as the abnormal single phase. If not, continue with the subsequent analysis;

[0015] Select the amplitude waveform that has not been denoted as an associated waveform as the associated waveform, and use the same method as above to confirm the amplitude difference. If the amplitude difference values associated with the other two groups of amplitude waveforms meet the evaluation criteria, it means that the three phases belong to single-phase abnormality, and the phase associated with the current associated waveform is denoted as the abnormal single phase. If not, it means that there are multiple-phase abnormalities, and generate a multiple-phase abnormality signal;

[0016] The load regulation terminal, based on the confirmed abnormal single phase, directly adjusts the operating voltage during the operation of the abnormal single phase in real time, and evenly distributes the increased or decreased operating voltage to the other two phases, so that the three phases are in a load balance state. The specific method is as follows:

[0017] Confirm the initial operating voltage Fv during the operation of the abnormal single phase, and perform real-time adjustment. Record the operating voltage difference generated during the adjustment process. The operating voltage difference = Fv - the adjusted operating voltage. Evenly distribute the recorded operating voltage difference to the other two phases, and synchronously adjust the operating voltages of the other two phases. During the real-time adjustment process, confirm whether the three phases are in a load-balanced state. The confirmation method is the same as the method for the load abnormality evaluation terminal to evaluate the three-phase load balance. If it is in a load-balanced state, stop the adjustment. If it is not in a load-balanced state, continue the adjustment until the three phases are in a load-balanced state and then stop;

[0018] The multi-phase load processing terminal selects a regular waveform segment from the three groups of amplitude waveforms associated with the three phases, adjusts the operating voltages associated with different assignment waveforms from the selected regular waveform segment, selects the best adjustment process from several groups of adjustment processes, and records the adjusted operating voltage. Use the recorded operating voltage to directly adjust the operating voltage of the specified phase through the load regulation terminal. The specific method is as follows:

[0019] Randomly select a group of waveforms from the three groups of amplitude waveforms associated with the three phases as the reference waveform. Randomly determine a group of amplitude zero points from the reference waveform. Based on the determined amplitude zero points, confirm the second group of amplitude zero points as the end point backward. Based on the determined base point and end point, lock the relevant time period between the two points, and determine the amplitude waveform segment belonging to the relevant time period from the three groups of amplitude waveforms, which is denoted as the regular waveform segment;

[0020] Adjust the operating voltage associated with waveforms of different amplitudes within the regular waveform segment, execute several groups of adjustment processes, and the sum value of the operating voltage differences adjusted in each group of adjustment processes is 0. The operating voltage difference = the current operating voltage - the adjusted operating voltage, and confirm the three-phase load balance state associated with each adjustment process. Sum the voltage amplitudes associated with the same moment. If the sum value = 0, it represents a three-phase load state, and this adjustment process is recorded as a standard process. If the sum value ≠ 0, continue to execute the subsequent adjustment processes until the confirmed sum value = 0 and then stop;

[0021] Record the operating voltage associated with the corresponding phase of the standard process as the regulated voltage, and transmit the confirmed regulated voltage to the load regulation terminal. The load regulation terminal adjusts the operating voltage of the specified phase to the regulated voltage.

[0022] The present invention provides a dynamic three-phase balanced and orderly charging intelligent AC charging device. Compared with the prior art, it has the following beneficial effects:

[0023] The present invention sums the amplitudes of different phase voltages and compares them with the set value, and can quickly identify abnormal three-phase load conditions. At the same time, by using absolute value processing and evaluation value calculation, the abnormal judgment standard is further refined. Compared with simple amplitude comparison, it can more accurately determine the degree of abnormality, avoid misjudgment caused by minor fluctuations, and effectively improve the system's diagnostic ability for abnormal three-phase loads;

[0024] Adjust the abnormal single-phase operating voltage in real time; by evenly distributing the operating voltage difference to the other two phases, the three phases quickly reach a load balance state; this adjustment method is highly targeted and can quickly solve the load imbalance problem caused by single-phase abnormality without affecting the operation stability of the overall power system, effectively reducing the risk of damage to equipment caused by overheavy single-phase load and improving the service life and reliability of power equipment;

[0025] The dynamic adjustment of the three-phase load effectively reduces the difference between the three-phase loads, avoiding problems such as excessive current and voltage fluctuations caused by three-phase load imbalance; this helps to improve the power quality, ensure the normal operation of various electrical equipment, reduce equipment failures and production accidents caused by power quality problems, and provide a more reliable power supply for industrial production and residential life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the principle framework of the present invention;

[0027] Figure 2 It is a schematic diagram for determining the regular waveform segment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] First Embodiment

[0030] Please refer to Figure 1 , this application provides a dynamic three-phase balanced and orderly charging intelligent AC charging device, including a three-phase amplitude monitoring terminal, a load abnormality evaluation terminal, an amplitude waveform analysis terminal, a load regulation terminal, and a polyphase load processing terminal. Among them, the three-phase amplitude monitoring terminal is electrically connected to the input node of the load abnormality evaluation terminal, and the load abnormality evaluation terminal, the amplitude waveform analysis terminal, and the load regulation terminal are electrically connected in sequence from the output node to the input node, and the amplitude waveform analysis terminal, the polyphase load processing terminal, and the load regulation terminal are electrically connected in sequence from the output node to the input node;

[0031] Among them, the three-phase amplitude monitoring terminal monitors the voltage amplitudes of the three phases in real time and transmits the voltage amplitudes of the three phases monitored in real time to the load abnormality evaluation terminal. Specifically, during amplitude monitoring, relevant monitoring is carried out by specified wiring, and its value is generated in real time. The collected amplitude is the voltage amplitude associated with the corresponding phase;

[0032] Among them, the load abnormality evaluation terminal, based on the voltage amplitudes monitored by the three phases at the corresponding moment, confirms the total characteristics of the three-phase amplitudes associated with the corresponding moment, compares the confirmed total characteristics of the three-phase amplitudes with the set value, confirms the comparison result, and evaluates whether there is an abnormal phase based on the comparison result. The specific method for comparison is as follows:

[0033] Calibrate the voltage amplitudes F i monitored by different phases at the corresponding moment, where i represents different phases and i = 1, 2, 3, and sum up the multiple groups of voltage amplitudes F i monitored at the corresponding moment to confirm the total amplitude value ZH;

[0034] If ZH = 0, it means that the three-phase load is balanced, no processing is required, and continuous monitoring can be carried out;

[0035] If ZH ≠ 0, then take the absolute value of the multiple groups of voltage amplitudes F i associated with the current moment to confirm the largest absolute value, and record it as J i , and use: |ZH| ÷ J i = PD i to confirm the evaluation value PD i , and identify the confirmed evaluation value PD iIs it satisfied: PD i ≥ 30%. If satisfied, it represents that the three-phase load is abnormal, and a three-phase load abnormal signal is directly generated for display. If not satisfied, the amplitude waveform analysis end is executed for relevant analysis of the amplitude;

[0036] When there is a three-phase load abnormal signal, it means that the corresponding three-phase load is overly abnormal, and relevant processing needs to be carried out on such overly abnormal three-phase loads to effectively reduce the three-phase load situation and avoid the situation where the internal circuit components of the corresponding device are damaged due to overly serious three-phase load. Under normal circumstances, the amplitude difference associated with the loads does not exceed 30%.

[0037] Among them, the amplitude waveform analysis end confirms the amplitude waveforms generated by the three phases in the past period. From multiple different amplitude waveforms, a certain amplitude zero point associated with a certain group of amplitude waveforms is selected. According to the amplitude zero point, the amplitude differences associated with other amplitude waveforms at the corresponding moment are confirmed. Based on the specific confirmation results, it is locked whether the three phases belong to single-phase abnormality or multi-phase abnormality. The specific locking method is as follows:

[0038] Combined with Figure 2 , confirm the amplitude waveforms generated by the three phases in the past period. Randomly select a certain group of amplitude waveforms as the associated waveform. Randomly select a group of amplitude zero points from the associated waveform (the amplitude zero point is the relevant point where the amplitude = 0). Select the specific moment associated with this amplitude zero point and record the specific moment as the zero point moment. Record the amplitudes associated with the other two groups of amplitude waveforms at the zero point moment as F1 and F2. Confirm whether F1 and F2 satisfy: |F1| - |F2| ≤ Y1, where Y1 is a preset value representing the maximum amplitude difference value. If satisfied, it means that the three phases belong to single-phase abnormality, and the phase associated with the associated waveform is recorded as the abnormal single phase. If not satisfied, continue with the subsequent analysis;

[0039] Select another group of amplitude waveforms as the associated waveform and use the same method as above to confirm the amplitude difference. If the amplitude difference values associated with the other two groups of amplitude waveforms meet the evaluation conditions, it means that the three phases belong to single-phase abnormality, and the phase associated with the current associated waveform is recorded as the abnormal single phase. If not satisfied, continue with the subsequent analysis;

[0040] Select the last amplitude waveform that has not been recorded as the associated waveform as the associated waveform and use the same method as above to confirm the amplitude difference. If the amplitude difference values associated with the other two groups of amplitude waveforms meet the evaluation conditions, it means that the three phases belong to single-phase abnormality, and the phase associated with the current associated waveform is recorded as the abnormal single phase. If not satisfied, it means that there is multi-phase abnormality, and a multi-phase abnormal signal is generated;

[0041] Specifically, it is assumed that there are three phases, namely A, B, and C. When only one phase is abnormal among the three phases, and the amplitude associated with this abnormal phase is at 0, then the sum of the amplitudes associated with the other two phases should be close to 0, that is, in a relatively balanced state. Then, the above method can be used to sequentially confirm whether the amplitude difference between the other two phases is close to 0 when a certain phase is at 0. If it exists, it means that this abnormal situation belongs to the single-phase abnormal situation, and the subsequent load control terminal can directly adjust the load of the abnormal single phase. If it does not exist, then there are multiple-phase abnormalities. Multiple-phase abnormalities will cause a large amplitude difference regardless of which phase is at 0, so it belongs to the multiple-phase abnormal situation, and the subsequent multiple-phase load processing terminal needs to perform an equalization process on the abnormal multiple phases to reduce the load of the three phases.

[0042] Second Embodiment

[0043] In the specific implementation process of this embodiment, compared with the above embodiment, this embodiment mainly performs relevant adjustments for single-phase abnormalities or multiple-phase abnormalities to reduce the specific load of its operating circuit and improve the actual operating effect of its operating circuit;

[0044] Among them, the load control terminal, based on the confirmed abnormal single phase, directly adjusts the operating voltage in real time when the abnormal single phase is operating, and evenly distributes the newly added or reduced operating voltage to the other two phases to make the three phases in a load-balanced state. The specific method for its real-time adjustment is as follows:

[0045] Confirm the initial operating voltage Fv during abnormal single-phase operation and perform real-time adjustment. Record the operating voltage difference generated during the adjustment process. The operating voltage difference = Fv - the adjusted operating voltage (if adjusted upward, the operating voltage difference is negative; if adjusted downward, the operating voltage difference is positive). Divide the recorded operating voltage difference equally among the other two phases and synchronously adjust the operating voltages of the other two phases (if the operating voltage difference is negative, the operating voltages of the other two phases are synchronously adjusted downward; if the operating voltage difference is positive, the operating voltages of the other two phases are synchronously adjusted upward). During the real-time adjustment process, confirm whether the three phases are in a load-balanced state. The confirmation method is the same as the method for the load abnormality evaluation terminal to evaluate the three-phase load balance (that is, the case where the confirmed ZH = 0. The amplitude voltage and the operating voltage are not the same concept. The amplitude voltage is the voltage amplitude associated with the corresponding phase in the alternating current. That is, the maximum value of the amplitude voltage is the operating voltage. Since it is in the alternating current operating state, assume the operating voltage of a certain phase is 5V, then the variation range of its amplitude voltage is [-5V, 5V]. As time changes, the amplitude voltage shows different amplitudes. When the three-phase load is balanced, the sum of the amplitudes associated with the three phases is generally 0. The amplitude voltage is the voltage amplitude). If it is in a load-balanced state, stop the adjustment. If it is not in a load-balanced state, continue the adjustment until the three phases are in a load-balanced state and then stop.

[0046] Among them, for the polyphase load processing end, select a regular waveform segment from the three groups of amplitude waveforms associated with the three phases, adjust the operating voltages associated with different assigned waveforms from the selected regular waveform segment, select the best adjustment process from several groups of adjustment processes, and record the adjusted operating voltage. Directly adjust the operating voltage of the specified phase through the load control end with the recorded operating voltage. The specific adjustment method is as follows:

[0047] Randomly select a group of waveforms from the three groups of amplitude waveforms associated with the three phases as the reference waveform. Randomly determine a group of amplitude zero points within the reference waveform. Based on the determined amplitude zero points, confirm the second group of amplitude zero points as the end point backward (that is, first confirm the first group of amplitude zero points, and then confirm two groups of amplitude zero points backward. The last group of amplitude zero points confirmed is the corresponding end point). Based on the determined base point and end point, lock the relevant time period between the two points, and determine the amplitude waveform segment belonging to the relevant time period from the three groups of amplitude waveforms, denoted as the regular waveform segment;

[0048] Adjust the operating voltage associated with waveforms of different amplitudes within the regular waveform segment, and execute several sets of adjustment processes. The sum of the differences in the operating voltages adjusted in each set of adjustment processes is 0. The difference in the operating voltage = the current operating voltage - the adjusted operating voltage (that is, during adjustment, the total voltage value of the three phases cannot change. When the operating voltage of one phase drops, the operating voltage of another phase must rise). Then, confirm the three-phase load balance state associated with each adjustment process, sum the voltage amplitudes associated with the same moment. If the sum value = 0, it means it is in a three-phase load state, and this adjustment process is recorded as the standard process. If the sum value ≠ 0, continue to execute the subsequent adjustment processes until the confirmed sum value = 0 and then stop;

[0049] Record the operating voltage associated with the corresponding phase of the standard process as the regulated voltage, and transmit the confirmed regulated voltage to the load regulation terminal. The load regulation terminal then adjusts the operating voltage of the specified phase to the regulated voltage.

[0050] Specifically, when there is unbalanced multi-phase load in the corresponding regular waveform, adopt the specific method of balance adjustment to regulate the operating voltages of different phases, so that the multi-phases are in a synchronous load balance situation, achieving a better phase load balance regulation effect.

[0051] Some of the data in the above formula are numerically calculated after removing their dimensions, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0052] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A dynamic three-phase balanced orderly charging intelligent AC charging device, characterized in that: include: The three-phase amplitude monitoring terminal monitors the voltage amplitude of the three phases in real time, and transmits the voltage amplitude of the three phases monitored in real time to the load abnormality assessment terminal; The load abnormality assessment end confirms the three-phase amplitude total characteristics associated with the corresponding time based on the voltage amplitudes monitored by the three phases at the corresponding time, checks the confirmed three-phase amplitude total characteristics with the set value, confirms the check result, and assesses whether there is an abnormal phase based on the check result; The amplitude waveform analysis end confirms the amplitude waveforms generated by the three phases in the past period, selects the amplitude zero point associated with a certain group of amplitude waveforms from multiple groups of different amplitude waveforms, and confirms the amplitude difference associated with other amplitude waveforms at the corresponding moment based on the amplitude zero point. Based on the specific confirmation results, it is determined whether the three phases are single-phase abnormal or multi-phase abnormal. The load control end directly adjusts the operating voltage of the abnormal single-phase in real time based on the confirmed abnormal single-phase, and evenly distributes the newly added or reduced operating voltage to the other two phases, so that the three phases are in a load balanced state; At the multi-phase load processing end, a regular waveform segment is selected from the three groups of amplitude waveforms associated with the three phases, the operating voltage associated with the different assigned waveforms is adjusted from the selected regular waveform segment, the best adjustment process is selected from several groups of adjustment processes, and the adjusted operating voltage is recorded, and the recorded operating voltage is directly adjusted to the operating voltage of the specified phase through the load control end.

2. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 1, characterized in that: The load abnormality assessment end checks the confirmed total characteristic of the three-phase amplitude with the set value in the following specific manner: The voltage amplitude monitored at different phases at the corresponding time is calibrated as F i , where i represents different phases, and i = 1, 2, 3, the multiple groups of voltage amplitudes F monitored at the corresponding time i Perform summation processing to confirm the amplitude sum ZH; If ZH≠0, then the multiple voltage amplitudes F associated with the current moment are i Perform absolute value processing to identify the largest absolute value and record it as J i , using: |ZH|÷J i =PD i Confirm the rating value PD i , and identify the confirmed assessment value PD i Whether it meets: PD i ≥30%. If it is met, it means that the three-phase load is abnormal, and a three-phase load abnormal signal is directly generated for display. If it is not met, the amplitude waveform analysis end is executed to perform amplitude correlation analysis.

3. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 2, characterized in that: If ZH=0, it means the three-phase load is balanced and no processing is required, just continuous monitoring.

4. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 1, characterized in that: The specific method of the amplitude waveform analysis end to lock whether the three phases are single-phase abnormal or multi-phase abnormal is: Confirm the amplitude waveforms generated by the three phases in the past period, randomly select a group of amplitude waveforms and record them as associated waveforms, randomly select a group of amplitude zero points from the associated waveforms, select the specific time associated with the amplitude zero point, record the specific time as the zero time, record the amplitudes associated with the other two groups of amplitude waveforms at the zero time as F1 and F2, and confirm whether F1 and F2 meet: |F1|-|F2|≤Y1, where Y1 is a preset value, representing the maximum amplitude difference value. If satisfied, it means that the three phases are single-phase abnormal, and the phase associated with the associated waveform is recorded as an abnormal single phase. If not satisfied, continue to perform subsequent analysis; Then select another set of amplitude waveforms as the associated waveforms, and use the same method as above to confirm the amplitude difference. If the amplitude difference values ​​associated with the other two sets of amplitude waveforms meet the evaluation conditions, it means that the three phases are single-phase abnormal, and the phase associated with the current associated waveform is recorded as an abnormal single phase. If not, continue the subsequent analysis; The last amplitude waveform that is not recorded as the associated waveform is selected as the associated waveform, and the amplitude difference is confirmed in the same way as above. If the amplitude difference value associated with the other two groups of amplitude waveforms meets the evaluation conditions, it means that the three phases belong to a single-phase abnormality, and the phase associated with the current associated waveform is recorded as an abnormal single phase. If it does not meet the conditions, it means that there is a multi-phase abnormality, and a multi-phase abnormal signal is generated.

5. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 1, characterized in that: The load control end performs real-time adjustment on the operating voltage during abnormal single-phase operation in the following specific manner: Confirm the initial operating voltage Fv during abnormal single-phase operation, and make real-time adjustments. Record the operating voltage difference generated during the adjustment process, where the operating voltage difference = Fv-adjusted operating voltage. Divide the recorded operating voltage difference evenly into the other two phases, and adjust the operating voltages of the other two phases synchronously. During the real-time adjustment process, confirm whether the three phases are in a load-balanced state. The confirmation method is consistent with the method of assessing the three-phase load balance at the load abnormality assessment end. If it is in a load-balanced state, stop adjusting. If it is not in a load-balanced state, continue adjusting until the three phases are in a load-balanced state and stop.

6. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 1, characterized in that: The specific method of confirming the operating voltage at the multi-phase load processing end is: A group of waveforms is randomly selected from the three groups of amplitude waveforms associated with the three phases as the reference waveform, a group of amplitude zero points is randomly determined from the reference waveform, the determined amplitude zero points are used as the base points, and the second group of amplitude zero points is confirmed as the end points. Based on the determined base points and end points, the relevant time period between the two points is locked, and the amplitude waveform segment belonging to the relevant time period is determined from the three groups of amplitude waveforms, which is recorded as a regular waveform segment; The operating voltages associated with waveforms of different amplitudes in the regular waveform segment are adjusted, and several groups of adjustment processes are executed. The sum of the operating voltage differences adjusted by each group of adjustment processes is 0, and the operating voltage difference = current operating voltage - adjusted operating voltage. The three-phase load balancing state associated with each adjustment process is confirmed, and the voltage amplitudes associated at the same time are summed. If the sum value = 0, it means that it is in a three-phase load state. This adjustment process is recorded as a standard process. If the sum value ≠ 0, the subsequent adjustment processes are continuously executed until the confirmed sum value = 0 is stopped; The operating voltage associated with the phase corresponding to the standard process is recorded as the control voltage, and the confirmed control voltage is transmitted to the load control terminal.

7. A dynamic three-phase balanced orderly charging intelligent AC charging device according to claim 6, characterized in that: The load regulating end regulates the operating voltage of the specified phase to a regulating voltage.

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