A power supply current sharing control system

Abstract

The present invention relates to power supply current sharing control technology, which is used to solve the problem that the existing current sharing control system can only perform simple fault alarms and it is difficult to quickly and accurately locate the cause of the fault. Specifically, it is a power supply current sharing control system, including a data detection module, an abnormality determination module, a fault diagnosis module, and a control adjustment module. The present invention collects current and voltage data through the data detection module, and after screening out abnormal values, it can obtain the load current and voltage data more accurately. Based on precise data comparison, the abnormality determination module can detect current sharing abnormalities in a timely manner. In the case of uneven load distribution, the control adjustment module can accurately adjust the duty cycle of the power module output current control signal according to the relationship between the average value of the inductor current and the duty cycle and the peak value of the inductor current, so that the load currents of each module tend to be balanced, effectively improving the current sharing accuracy, avoiding overload or underutilization of some power modules, enhancing the overall efficiency of the power supply system, and prolonging the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technology of power supply current sharing control, and specifically to a power supply current sharing control system. Background Art

[0002] In modern power systems, with the continuous improvement of the requirements for the power supply reliability and stability of various electrical devices, the power supply current sharing control technology has become a key link to ensure the power supply quality. The method of parallel power supply of multiple power modules has been widely used in industrial production, communication base stations, data centers and other fields because it can improve the power capacity of the power supply system, enhance redundancy and reliability;

[0003] In terms of current sharing accuracy, traditional current sharing control methods mainly allocate load current based on the droop characteristics of the output voltage of power modules changing with current. This method is greatly affected by factors such as the difference in the output impedance of power modules and the inconsistency of line impedance, resulting in low current sharing accuracy; in some occasions with extremely high requirements for power supply quality, such current sharing accuracy may cause some power modules to be overloaded, while some modules fail to fully play their roles, not only reducing the overall efficiency of the power supply system, but also affecting the normal operation of equipment and shortening the service life of equipment;

[0004] In terms of fault diagnosis and handling, when the current sharing control is abnormal in the existing technology, it usually can only give a simple fault alarm, and it is difficult to quickly and accurately locate the cause of the fault, which makes maintenance personnel spend a lot of time and energy in troubleshooting, reducing the availability and maintenance efficiency of the system;

[0005] In view of the above technical problems, this application proposes a solution. Summary of the Invention

[0006] The purpose of the present invention is to collect current and voltage data through a data detection module, and after screening out abnormal values, more accurately obtain the load current and voltage data; the abnormal determination module can timely detect current sharing abnormalities based on accurate data comparison. For the situation of uneven load distribution, the control adjustment module can accurately adjust the duty cycle of the output current control signal of the power module according to the relationship between the average value of the inductor current and the duty cycle and the peak value of the inductor current, so that the load current of each module tends to be balanced, effectively improving the current sharing accuracy, avoiding some power modules from being overloaded or underutilized, enhancing the overall efficiency of the power supply system, extending the service life of equipment, and solving the problem that the existing current sharing control system can only give a simple fault alarm and it is difficult to quickly and accurately locate the cause of the fault, and a power supply current sharing control system is proposed.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A power supply current sharing control system includes a data detection module, an abnormal determination module, a fault diagnosis module and a control adjustment module;

[0009] The data detection module collects the current data passing through the power supply and the voltage data at both ends of the power supply, and after filtering out abnormal values, transmits the detected current data and voltage data to the abnormality determination module;

[0010] The abnormality determination module compares the load current data of each power module with the load current average. If the absolute value of the difference between the two is greater than the preset current change threshold, it is determined that the current sharing control is abnormal and the abnormal power module is determined;

[0011] The fault diagnosis module obtains the load current data of the abnormal power module processed by the abnormality determination module, compares the load current data with the rated current data, determines the abnormal situation according to the comparison result, and transmits the processing result to the control adjustment module;

[0012] The control and adjustment module receives the processing results transmitted by the fault diagnosis module and performs precise control and adjustment on the power module according to the processing results.

[0013] As a preferred embodiment of the present invention, the processing steps of the data detection module to screen out abnormal values are as follows:

[0014] K1: Calculate the corresponding mean and standard deviation of the load current data and voltage data detected at the same time, and then use the calculated mean and standard deviation data to establish the fluctuation range of the load current and voltage respectively. The difference between the load current mean and twice the load current standard deviation is recorded as the lower limit of the load current fluctuation range, and the sum of the load current mean and twice the load current standard deviation is recorded as the upper limit of the load current fluctuation range, so as to obtain the fluctuation range of the load current; the difference between the voltage mean and twice the voltage standard deviation is recorded as the lower limit of the voltage fluctuation range, and the sum of the voltage mean and twice the voltage standard deviation is recorded as the upper limit of the voltage fluctuation range, so as to obtain the fluctuation range of the voltage;

[0015] K2: The load current data and voltage data that are not within the corresponding fluctuation range are marked as abnormal load current data and abnormal voltage data. After the abnormal load current data and abnormal voltage data in the detection data are eliminated, the mean of the remaining load current data and voltage data are calculated respectively, and the calculated load current mean and voltage mean are recorded as the load current data and voltage data at the corresponding moment.

[0016] As a preferred embodiment of the present invention, the abnormality determination steps of the abnormality determination module are as follows:

[0017] M1: When multiple power modules supply power to the load, the load current data of each power module is detected, and the average load current corresponding to each power module is calculated;

[0018] M2: If the absolute value of the difference between the load current data of the corresponding power supply module and the average load current is greater than the preset current change threshold, it is determined that there is an abnormality in the current sharing control, and the power supply module with the absolute value of the difference between the load current data and the average load current greater than the preset current change threshold is determined as an abnormal power supply module.

[0019] As a preferred embodiment of the present invention, the steps for determining abnormal conditions of the fault diagnosis module are as follows:

[0020] Q1: Compare the load current data of the abnormal power supply module with the rated current data corresponding to the power supply module. If the load current data of the abnormal power supply module is less than the rated current data, it is determined that there is a situation of uneven load distribution, power supply module failure, or load change; if the load current data of the abnormal power supply module is greater than the rated current data, it is determined that there is a situation of overload, power supply module failure, or short circuit.

[0021] Q2: If the number of parallel power supply modules is , count the number of power supply modules with the absolute value of the difference between the load current data and the average load current equal to the preset current change threshold, denoted as , then the number of power supply modules with a relatively large deviation between the load current data and the average load current is . If the preset comparison threshold , it is determined that the abnormal current sharing control is caused by uneven load distribution.

[0022] Q3: Detect the waveform and amplitude of the current sharing control signal through an oscilloscope, record the wavelength, wave width, and amplitude data of the current sharing control signal, and compare the recorded wavelength, wave width, and amplitude data of the current sharing control signal with the preset wavelength, wave width, and amplitude data of the current sharing control signal. If the difference between the corresponding data exceeds the preset fluctuation threshold, it is determined that the abnormal current sharing control is caused by uneven load distribution.

[0023] Q4: If both methods determine that there is a situation of uneven load distribution in the current sharing control system, it is determined that the abnormal current sharing control is caused by uneven load distribution; otherwise, the detection of uneven load distribution is performed again.

[0024] As a preferred embodiment of the present invention, the steps for determining power supply module failure and load change by the fault diagnosis module are as follows:

[0025] S1: Test the abnormal power supply module, measure the output voltage data and output current data of the abnormal power supply module under different input conditions, and draw the output voltage and output current curves in the coordinate system constructed by the output voltage and output current, denoted as the abnormal curve. Then draw the output voltage and output current curves of the normal power supply module in the coordinate system constructed by the output voltage and output current, denoted as the normal curve.

[0026] S2: Intercept a coordinate segment of a set length on the coordinate system. Take the end closer to the coordinate origin as the starting segment of the coordinate segment. Take a point on the starting segment as the starting point and the point corresponding to the corresponding value on the coordinate horizontal axis as the end point. Make a connection and calculate the slope of the connection. If the numerical difference on the coordinate vertical axis corresponding to the end point is within the set fluctuation range and the slopes of the corresponding connections between the abnormal curve and the normal curve are within the set fluctuation range, it is determined that the abnormal power supply module is normal; otherwise, it is determined that the current sharing control abnormality is caused by a power supply module fault.

[0027] S3: Detect the temperature data of the abnormal power supply module and compare the detected temperature data of the abnormal module with the temperature data of the normal module. If the absolute value of the temperature difference is greater than the preset temperature threshold, it is determined that the current sharing control abnormality is caused by a power supply module fault.

[0028] S4: If it is determined that the abnormal power supply module is faulty by both methods, it is determined that the current sharing control abnormality is caused by a power supply module fault; otherwise, the detection of the abnormal power supply module fault is performed again.

[0029] As a preferred embodiment of the present invention, the steps for the fault diagnosis module to determine overload and short - circuit are as follows:

[0030] R1: Calculate the rated power data of the load device based on the detected voltage data and detected current data of the load device. , and then calculate the total rated power of several power supply modules supplying power to the load device. If the actual power of the load device is greater than the total rated power of the power supply modules, it is determined that the current sharing control abnormality is caused by overload.

[0031] R2: If the load rate of the load device exceeds of the ratio, it is determined that the load device is in a high - load working state. If the load device is in a high - load working state and the load current of the power supply module exceeds the rated value, it is determined that the current sharing control abnormality is caused by overload.

[0032] R3: If the measured resistance value is zero, it is determined that the current sharing control abnormality is caused by a short - circuit.

[0033] As a preferred embodiment of the present invention, the adjustment steps of the control adjustment module are as follows:

[0034] Y1: If it is determined that the current sharing control abnormality is caused by uneven load distribution, by adjusting the duty cycle of the output current control signal of the power supply module, change its output power to make the load currents of each module tend to be balanced; assume the duty cycle of the current control signal is , the peak value of the inductance current of the power supply module is , and the average value of the inductance current is expressed as the relationship with the duty cycle and the peak value of the inductance current as , when it is necessary to adjust the load current, let the duty cycle before adjustment be , and the corresponding load current be , the duty cycle after adjustment be , and the corresponding load current be , then , , by comparing the two equations, it is deduced that ;

[0035] Y2: If it is determined that the current sharing control anomaly is caused by a power module failure, the system immediately cuts off the connection between the faulty module and the load, and at the same time issues an alarm to notify the maintenance personnel for repair or replacement; if it is determined that the current sharing control anomaly is caused by overload, the system communicates with the load device to request the load device to reduce the power demand, or directly cuts off the power supply of some non-critical loads; if it is determined that the current sharing control anomaly is caused by a short circuit, the system immediately cuts off the output of the power module;

[0036] Y3: If it is determined that the current sharing control anomaly is caused by load changes, the system automatically adjusts the output current of each power module according to the real-time changes of the load current and voltage; for a time series , where n represents the time point, represents the load value at the time point , a -order autoregressive model is expressed as , are autoregressive coefficients, is a white noise sequence, representing the random error of the model; by using the least squares method to estimate the parameters of the historical load data , the estimated value of the autoregressive coefficient is obtained, then the load prediction value at the time point is expressed as ;

[0037] Y4: The output power of the th power module at the time point is , the total output power of all power modules , the ideal power share that each power module should bear , is the rated power of the th power module, is the rated power of the th power module; according to the load prediction value calculated at the time point , the output power that each power module should adjust is ; At time point , the target total output power value that all power modules should reach is , the power factor of the load is , then ; The th power module's target output power at time point is , then the output power that the th power module should adjust at time point is .

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] 1. The current and voltage data are collected by the data detection module, and after the outliers are removed, the load current and voltage data can be obtained more accurately; based on the precise data comparison, the abnormal current sharing can be detected in time by the abnormal determination module. For the situation of uneven load distribution, the control adjustment module can accurately adjust the duty cycle of the output current control signal of the power module according to the relationship between the average value of the inductor current and the duty cycle and the peak value of the inductor current, so that the load currents of each module tend to be balanced, effectively improving the current sharing accuracy, avoiding overloading or underutilization of some power modules, enhancing the overall efficiency of the power supply system, and prolonging the service life of the equipment;

[0040] 2. By comparing the load current of the abnormal power module with the rated current through the fault diagnosis module, and analyzing in combination with the number of parallel power modules and the current sharing control signal, the problem of uneven load distribution can be accurately judged; by testing the output characteristics of the abnormal module, detecting the temperature and comparing with the normal module, the faults of the power module can be effectively diagnosed; by using methods such as the change of the working state of the load device and power calculation, the abnormal situations of load change, overload and short circuit can be identified; for different faults, the control adjustment module can take targeted measures, such as cutting off the connection of the faulty module, requesting the load device to reduce power, cutting off the power supply of non-critical loads, adjusting the output of the power module, etc., greatly improving the fault handling efficiency and system availability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0042] Figure 1 is the system flow structure diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0043] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example:

[0045] See also Figure 1 As shown, a power supply current sharing control system includes a data detection module, an abnormality determination module, a fault diagnosis module and a control adjustment module;

[0046] Detect the current data passing through the power supply and the voltage data at both ends of the power supply, record the load current data and voltage data detected at the same time, and filter out abnormal values;

[0047] The corresponding mean and standard deviation of the load current data and voltage data detected at the same time are calculated respectively, and then the fluctuation ranges of the load current and voltage are established respectively with the calculated mean and standard deviation data, and the difference between the load current mean and twice the load current standard deviation is recorded as the lower limit of the load current fluctuation range, and the sum of the load current mean and twice the load current standard deviation is recorded as the upper limit of the load current fluctuation range, so as to obtain the fluctuation range of the load current; the difference between the voltage mean and twice the voltage standard deviation is recorded as the lower limit of the voltage fluctuation range, and the sum of the voltage mean and twice the voltage standard deviation is recorded as the upper limit of the voltage fluctuation range, so as to obtain the voltage fluctuation range; the load current data and voltage data that are not within the corresponding fluctuation range are marked as abnormal load current data and abnormal voltage data, and after the abnormal load current data and abnormal voltage data in the detection data are eliminated, the mean of the remaining load current data and voltage data is calculated respectively, and the calculated load current mean and voltage mean are recorded as the load current data and voltage data at the corresponding moment.

[0048] When multiple power modules supply power to the load, the load current data of each power module is detected, and the load current average corresponding to each power module is calculated. If the absolute value of the difference between the load current data of the corresponding power module and the load current average is greater than the preset current change threshold, it is determined that there is an abnormality in the current sharing control, and the power module whose absolute value of the difference between the load current data and the load current average is greater than the preset current change threshold is determined as an abnormal power module;

[0049] Compare the load current data of the abnormal power supply module with the rated current data corresponding to the power supply module. If the load current data of the abnormal power supply module is less than the rated current data, it is determined that there is a situation of uneven load distribution, power supply module failure, or load change; if the load current data of the abnormal power supply module is greater than the rated current data, it is determined that there is a situation of overload, power supply module failure, or short circuit.

[0050] If the number of parallel power supply modules is , count the number of power supply modules whose absolute value of the difference between the load current data and the average load current is equal to the preset current change threshold, and record it as , then the number of power supply modules with a large deviation between the load current data and the average load current is , if the preset comparison threshold , then it is determined that the abnormal current sharing control is caused by uneven load distribution; detect the waveform and amplitude of the current sharing control signal through an oscilloscope, record the wavelength, pulse width, and amplitude data of the current sharing control signal, and compare the recorded wavelength, pulse width, and amplitude data of the current sharing control signal with the preset wavelength, pulse width, and amplitude data of the current sharing control signal. If the difference between the corresponding item data exceeds the preset fluctuation threshold, it is determined that the abnormal current sharing control is caused by uneven load distribution; if both methods determine that there is uneven load distribution in the current sharing control system, it is determined that the abnormal current sharing control is caused by uneven load distribution; otherwise, re-detect for uneven load distribution;

[0051] Test the abnormal power supply module, measure the output voltage data and output current data of the abnormal power supply module under different input conditions, and draw the output voltage and output current curves in the coordinate system constructed by the output voltage and output current, which is recorded as the abnormal curve. Then draw the output voltage and output current curves of the normal power supply module in the coordinate system constructed by the output voltage and output current, which is recorded as the normal curve; intercept a coordinate segment of a set length on the coordinate system, with the end closer to the coordinate origin as the starting segment of the coordinate segment, take a point on the starting segment as the starting point, and the point corresponding to the corresponding value on the coordinate horizontal axis as the end point, make a connection and calculate the slope of the connection. If the numerical difference on the coordinate vertical axis corresponding to the end point is within the set fluctuation range, and the slopes of the corresponding connections of the abnormal curve and the normal curve are within the set fluctuation range, it is determined that the abnormal power supply module is normal; otherwise, it is determined that the abnormal current sharing control is caused by a power supply module failure; detect the temperature data of the abnormal power supply module, and compare the detected temperature data of the abnormal module with the temperature data of the normal module. If the absolute value of the temperature difference is greater than the preset temperature threshold, it is determined that the abnormal current sharing control is caused by a power supply module failure; if both methods determine that the abnormal power supply module fails, it is determined that the abnormal current sharing control is caused by a power supply module failure; otherwise, re-detect for the failure of the abnormal power supply module;

[0052] Obtain the change in the working state of the load device. When an operation occurs on the load device, mark the time when the operation occurs. If the time point when the load current changes coincides with the time point when the operation of the load device occurs, it is determined that the abnormal current sharing control is caused by the load change.

[0053] Calculate the rated power data of the load device based on the detected voltage data and detected current data of the load device. , and then calculate the total rated power of several power modules supplying power to the load device. If the actual power of the load device is greater than the total rated power of the power modules, it is determined that the abnormal current sharing control is caused by overload; if the load ratio of the load device exceeds of the ratio, it is determined that the load device is in a high-load working state. If the load device is in a high-load working state and the load current of the power module exceeds the rated value, it is determined that the abnormal current sharing control is caused by overload;

[0054] Measure the input resistance of the load through the resistance range of the multimeter. If the measured resistance value is zero, it is determined that the abnormal current sharing control is caused by a short circuit; starting from the input end of the load, gradually disconnect the connections of each part. After disconnecting each part, measure the resistance of the input end again. If during the measurement process, the resistance value changes from close to zero to a normal value, it indicates that the short circuit occurs in the part that was just disconnected;

[0055] If it is determined that the abnormal current sharing control is caused by uneven load distribution, by adjusting the duty cycle of the output current control signal of the power module, change its output power to make the load currents of each module tend to be balanced; let the duty cycle of the current control signal be , the peak value of the inductor current of the power module be , and the average value of the inductor current The relationship with the duty cycle and the peak value of the inductor current is expressed as , when the load current needs to be adjusted, let the duty cycle before adjustment be , the corresponding load current be , the duty cycle after adjustment be , the corresponding load current be , then , , by comparing the two formulas, it is deduced that ;

[0056] If it is determined that the abnormal current sharing control is caused by a power module failure, the system immediately cuts off the connection between the faulty module and the load, and at the same time issues an alarm to notify the maintenance personnel for repair or replacement; during the fault troubleshooting process, the system further deeply analyzes the operation data of the faulty module, combines the internal circuit structure and component parameters of the module, and more accurately locates the fault point to improve the repair efficiency; for faults that can be repaired online, such as software faults or partial hardware parameter drift problems, the system autonomously attempts to automatically repair and restore the normal operation of the module;

[0057] If it is determined that the abnormal current sharing control is caused by load changes, the system automatically adjusts the output current of each power module according to the real-time changes of the load current and voltage to ensure good current sharing effect during the load change process; at the same time, the system analyzes the historical operation data and operation mode of the load equipment in advance to adjust the output of the power module and reduce the current sharing fluctuation caused by load changes; for a time series , where n represents the time point, represents the load value at the time point , and an order autoregressive model is expressed as , are autoregressive coefficients, is a white noise sequence, representing the random error of the model; by using the least squares method to estimate the parameters of the historical load data , the estimated values of the autoregressive coefficients can be obtained, and then the load prediction value at the time point is expressed as ;

[0058] The output power of the th power module at the time point is , and the total output power of all power modules. In order to achieve current sharing control, the ideal power share that each power module should bear is the rated power of the th power module, is the rated power of the th power module; according to the load prediction value , the output power that each power module should adjust at the time point is calculated as ; at the time point , the total output power target value that all power modules should reach is , and the power factor of the load is , then ; the th power supply module at time point target output power , then the th power supply module at time point output power to be adjusted ;

[0059] If it is determined that the current sharing control abnormality is caused by overload, the system communicates with the load device to request the load device to reduce the power demand, or directly cuts off the power supply of some non-critical loads to perform a load reduction measure to protect the power supply module and the load device; at the same time, the system can monitor the operating state of the power supply module in real time. If the overload situation persists and cannot be solved by load reduction, an alarm should be issued in time to notify relevant personnel for handling;

[0060] If it is determined that the current sharing control abnormality is caused by a short circuit, the system immediately cuts off the output of the power supply module to prevent damage to the device caused by excessive short-circuit current; then, through a step-by-step troubleshooting method, the short-circuit location is accurately determined; after repairing the short-circuit fault, multiple short-circuit detection points are set at key circuit nodes to improve the reliability of short-circuit detection.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A power supply current sharing control system, characterized in that, It includes a data detection module, an abnormality determination module, a fault diagnosis module, and a control adjustment module; The data detection module collects the current data passing through the power supply and the voltage data across the power supply. After screening out abnormal values, it transmits the detected current data and voltage data to the abnormality determination module; The abnormality determination module compares the load current data of each power supply module with the average load current. If the absolute value of the difference between the two is greater than the preset current change threshold, it determines that the current sharing control is abnormal and determines the abnormal power supply module; The abnormality determination steps of the abnormality determination module are as follows: M1: When each power supply module supplies power to the load, it detects the load current data of each power supply module and calculates the average load current corresponding to each power supply module; M2: If the absolute value of the difference between the load current data of the corresponding power supply module and the average load current is greater than the preset current change threshold, it determines that the current sharing control is abnormal, and determines the power supply module with the absolute value of the difference between the load current data and the average load current greater than the preset current change threshold as the abnormal power supply module; The abnormal situation determination steps of the fault diagnosis module are as follows: Q1: Compare the load current data of the abnormal power supply module with the rated current data corresponding to the power supply module. If the load current data of the abnormal power supply module is less than the rated current data, it determines that there is a situation of uneven load distribution, power supply module failure, or load change; if the load current data of the abnormal power supply module is greater than the rated current data, it determines that there is a situation of overload, power supply module failure, or short circuit; Q2: If the number of parallel power supply modules is , count the number of power supply modules whose absolute value of the difference between the load current data and the average load current is equal to the preset current change threshold, denoted as , then the number of power supply modules with a large deviation between the load current data and the average load current is . If the preset comparison threshold is , it is determined that the abnormal current sharing control is caused by uneven load distribution; Q3: Detect the waveform and amplitude of the current sharing control signal through an oscilloscope, record the wavelength, wave width, and amplitude data of the current sharing control signal, and compare the recorded wavelength, wave width, and amplitude data of the current sharing control signal with the preset wavelength, wave width, and amplitude data of the current sharing control signal. If the difference between the corresponding data exceeds the preset fluctuation threshold, it determines that the current sharing control abnormality is caused by uneven load distribution; Q4: If both methods determine that there is a situation of uneven load distribution in the current sharing control system, it determines that the current sharing control abnormality is caused by uneven load distribution; otherwise, it re-detects the uneven load distribution; The fault diagnosis module obtains the load current data of the abnormal power supply module processed by the abnormality determination module, compares the load current data with the rated current data, judges the existing abnormal situation according to the comparison result, and transmits the processing result to the control adjustment module; The control adjustment module receives the processing result transmitted by the fault diagnosis module and performs control adjustment on the power supply module according to the processing result.

2. The power supply current sharing control system according to claim 1, characterized in that, The processing steps for the data detection module to screen out abnormal values are as follows: K1: Calculate the corresponding mean values and standard deviations of the load current data and voltage data detected at the same moment respectively. Then, establish the fluctuation ranges of the load current and voltage with the calculated mean and standard deviation data. Denote the difference between the load current mean and twice the load current standard deviation as the lower limit of the load current fluctuation range, and denote the sum of the load current mean and twice the load current standard deviation as the upper limit of the load current fluctuation range to obtain the fluctuation range of the load current. Denote the difference between the voltage mean and twice the voltage standard deviation as the lower limit of the voltage fluctuation range, and denote the sum of the voltage mean and twice the voltage standard deviation as the upper limit of the voltage fluctuation range to obtain the fluctuation range of the voltage. K2: Mark the load current data and voltage data not within the corresponding fluctuation ranges as abnormal load current data and abnormal voltage data. After removing the abnormal load current data and abnormal voltage data from the detected data, calculate the mean values of the remaining load current data and voltage data respectively, and denote the calculated load current mean and voltage mean as the load current data and voltage data at the corresponding moment.

3. The power supply current sharing control system according to claim 1, characterized in that, The steps for the fault diagnosis module to determine power module faults and load changes are as follows: S1: Test the abnormal power module, measure the output voltage data and output current data of the abnormal power module under different input conditions, and draw the output voltage and output current curves in the coordinate system constructed by the output voltage and output current, denoted as the abnormal curve. Then, draw the output voltage and output current curves of the normal power module in the coordinate system constructed by the output voltage and output current, denoted as the normal curve. S2: Intercept a coordinate segment of a set length on the coordinate system. Take the end closer to the coordinate origin as the starting segment of the coordinate segment. Starting from a point on the starting segment, connect it to the point corresponding to the corresponding value on the coordinate horizontal axis as the end point, and calculate the slope of the connection line. If the numerical difference on the coordinate vertical axis corresponding to the end point is within the set fluctuation range, and the slopes of the corresponding connection lines of the abnormal curve and the normal curve are within the set fluctuation range, determine that the abnormal power module is normal. Otherwise, it is determined that the abnormal current sharing control is caused by a power module fault. S3: Detect the temperature data of the abnormal power module, and compare the detected abnormal module temperature data with the temperature data of the normal module. If the absolute value of the temperature difference is greater than the preset temperature threshold, it is determined that the abnormal current sharing control is caused by a power module fault. S4: If both methods determine that the abnormal power module is faulty, it is determined that the abnormal current sharing control is caused by a power module fault. Otherwise, re-detect the fault of the abnormal power module.

4. The power supply current sharing control system according to claim 3, wherein The steps for the fault diagnosis module to determine overload and short circuit are as follows: R1: Calculate the rated power data of the load device based on the detected voltage data and detected current data of the load device, , and then calculate the total rated power of several power modules supplying power to the load device. If the actual power of the load device is greater than the total rated power of the power modules, it is determined that the abnormal current sharing control is caused by overload; R2: If the load ratio of the load device exceeds the ratio, it is determined that the load device is in a high-load working state. If the load device is in a high-load working state and the load current of the power supply module exceeds the rated value, it is determined that the abnormal current sharing control is caused by overload; R3: If the measured resistance value is zero, it is determined that the abnormal current sharing control is caused by a short circuit.

5. A power supply current sharing control system according to claim 4, characterized in that, The adjustment steps of the control adjustment module are as follows: Y1: If it is determined that the current sharing control anomaly is caused by uneven load distribution, the duty cycle of the output current control signal of the power module is adjusted to change its output power, so that the load currents of each module tend to be balanced; Let the duty cycle of the current control signal be , the peak inductor current of the power module is , the average inductor current The relationship with the duty cycle and the peak inductor current is expressed as . When the load current needs to be adjusted, let the duty cycle before adjustment be , the corresponding load current is , the duty cycle after adjustment is , the corresponding load current is , then , . By comparing the two equations, it is deduced that ; Y2: If it is determined that the current sharing control anomaly is caused by a power module failure, the system immediately cuts off the connection between the faulty module and the load, and at the same time issues an alarm to notify the maintenance personnel for repair or replacement; if it is determined that the current sharing control anomaly is caused by overload, the system communicates with the load device to request the load device to reduce the power demand, or directly cuts off the power supply of some non-critical loads; if it is determined that the current sharing control anomaly is caused by a short circuit, the system immediately cuts off the output of the power module; Y3: If it is determined that the equal - current control anomaly is caused by load changes, the system automatically adjusts the output current of each power module according to the real - time changes of the load current and voltage; for a time series , where n represents the time point, represents the load value at the time point , and an autoregressive model of order is expressed as , are autoregressive coefficients, is a white - noise sequence, representing the random error of the model; by using the least - squares method to estimate the parameters of the historical load data , the estimated value of the autoregressive coefficient is obtained, and then the load prediction value at the time point is expressed as ; Y4: No. The power module at time The output power is , the total output power of all power modules , the ideal power share that each power module should bear , For the The rated power of each power module, For the The rated power of each power module; based on the load prediction value Calculate at time point At this moment, the output power of each power module should be adjusted to ; at a point in time At this moment, the total output power target value that all power modules should achieve is , the power factor of the load is ,but ;No. The power module at time Target output power , then The power module at time The output power should be adjusted .

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