Auxiliary converter state diagnosis method, device and system and medium

Abstract

The invention discloses an auxiliary converter state diagnosis method, device and system and a medium, and the method comprises the steps: obtaining current data detected by a filter inductance input side sensor of a detected auxiliary converter to obtain an inductive current when the detected auxiliary converter is started and an output contactor of the detected auxiliary converter is not closed; acquiring an output voltage detected by an output voltage sensor in the detected auxiliary converter; carrying out fundamental wave extraction on the obtained inductive current by using a second-order generalized integrator to obtain an inductive current fundamental wave; carrying out fundamental wave extraction on the obtained output voltage by using a second-order generalized integrator and calculating a derivative to obtain a fundamental wave guide number of the output voltage; calculating the capacitance value of a capacitor in a filter circuit of the tested auxiliary converter according to the fundamental wave of the inductive current and the base wave guide number of the output voltage; and judging the fault state of the filter circuit capacitor according to the calculated capacitance value of the capacitor. The method has the advantages of simple operation, low cost, high diagnosis efficiency and precision and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted auxiliary converter fault diagnosis, and in particular to an auxiliary converter state diagnosis method, device, system and medium. Background Art

[0002] like Figure 1 As shown in FIG. 1 , the vehicle auxiliary converter uses a pulse width modulation (PWM) method to collect output voltage information based on sensors, compares it with a reference value, and controls the IGBT action of the three-phase bridge after calculation by a closed-loop control system to generate a three-phase square wave voltage with a phase difference of 120 degrees in the three phases. The high-order harmonic components in the square wave voltage are filtered out through an LC low-pass filter circuit composed of inductors and capacitors, and then a three-phase sinusoidal alternating current is obtained. However, if a fault occurs in the filter circuit, the actual inductor and capacitor capacity will be reduced, and the filter circuit will not be able to filter out high-order harmonics according to the predetermined design, resulting in an increase in the harmonic content of the output voltage, affecting the output voltage performance of the auxiliary inverter, and even causing the auxiliary inverter to fail to protect. And because the pulse width modulation generates a square wave voltage, the current on the filter inductor and capacitor has high-order harmonic components, and the actual current of the filter circuit cannot be directly used for status diagnosis.

[0003] In the prior art, the fault status diagnosis of the filter circuit in the vehicle auxiliary converter is usually performed by analyzing the harmonics of the output voltage under no-load conditions to determine whether the filter capacitor has a fault, that is, the vehicle auxiliary converter is first adjusted to the no-load condition, and then the harmonics of the auxiliary converter output voltage under no-load conditions are collected to determine the harmonic status of the output voltage. If the output voltage cannot filter out the high-order harmonics as preset, it is considered that the filter capacitor has a fault. However, the diagnostic accuracy of the above fault diagnosis method is not high, especially when the output voltage performance is not significantly reduced, because it is difficult to accurately determine the state of the filter circuit because it is impossible to directly determine the state of the filter circuit filtering out harmonics.

[0004] Under normal circumstances, the capacitance value of the filter capacitor calculated according to the real-time operating status of the auxiliary converter should be consistent with the nominal capacitance value. Therefore, the capacitance value calculated based on the real-time operating status of the auxiliary converter can reflect the fault state of the filter capacitor. However, in the prior art, the capacitance detection of the filter capacitor is usually obtained based on the resonant current of the filter circuit under the resonant state, or by setting up additional detection equipment for detection, which is not only complex and costly to implement, but also usually requires the auxiliary converter to work under specific working conditions, affecting the normal operation of the auxiliary converter.

[0005] For example, Chinese patent application CN110187204A discloses a method for detecting the state of a DC capacitor of a neutral point clamped multi-level converter. This method targets the DC side capacitor of a neutral point clamped three-level inverter. The method discharges the DC side capacitor first, then controls the two-phase bridge wall to send pulses to control the switch tube to resonate the LC filter circuit, and then calculates the capacitance value based on the resonant current. Not only is the calculation and implementation complex, but the DC side capacitor and the two-phase bridge wall pulses must be controlled to work under specific working conditions, which will interfere with the normal operation of the converter and make it impossible to diagnose the capacitance value of the capacitor during normal use.

[0006] Chinese patent application CN106058930A discloses a system and method for automatically detecting the busbar capacitance value of a photovoltaic grid-connected inverter. The scheme installs an auxiliary test resistor on the DC side, fully charges the capacitor when the auxiliary test resistor is disconnected, and then connects the auxiliary test resistor to discharge the capacitor. The approximate capacitance value of the capacitor is calculated during the discharge process, and the capacitance state is determined by comparing it with the acceptable lower limit of the capacitance value. However, the testing process of this scheme is complicated and requires the installation of additional hardware, which increases the implementation cost and complexity. Summary of the invention

[0007] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides an auxiliary converter state diagnosis method, device, system and medium with simple operation, low cost, high diagnostic efficiency and accuracy.

[0008] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0009] A method for diagnosing the state of an auxiliary converter, comprising the steps of:

[0010] When the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed, current data detected by a sensor at the input side of a filter inductor in a filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and an output voltage detected by an output voltage sensor in the auxiliary converter under test is obtained;

[0011] The obtained inductor current is extracted using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0012] The obtained output voltage is subjected to fundamental wave extraction and derivative calculation using a second-order generalized integrator to obtain the fundamental wave derivative of the output voltage;

[0013] Calculating the capacitance value of the capacitor in the measured auxiliary converter filter circuit according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage;

[0014] The fault state of the capacitor of the filter circuit is determined according to the calculated capacitance value.

[0015] Furthermore, the transfer function of the second-order generalized integrator is Among them, ω is the angular frequency of the fundamental signal, and k is the gain coefficient.

[0016] Furthermore, the capacitance C of the capacitor in the measured auxiliary converter filter circuit is calculated according to the derivative of the inductor current fundamental wave and the output voltage according to the following formula:

[0017]

[0018] Among them, i f is the capacitor current fundamental wave, is the fundamental derivative of the output voltage.

[0019] Furthermore, the detecting of the inductor current in the filter circuit of the auxiliary converter under test also includes filtering the detected current through a bandpass filter.

[0020] Furthermore, judging the fault state of the capacitor in the filter circuit according to the calculated capacitor value includes: comparing the calculated capacitor value with the nominal capacitor value, and if the deviation value exceeds a preset threshold, determining that the capacitor in the auxiliary converter filter circuit is damaged.

[0021] A method for diagnosing the state of an auxiliary converter, comprising the steps of:

[0022] After the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is closed, current data detected by a sensor at the input side of a filter inductor in a filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and an output voltage detected by an output voltage sensor in the auxiliary converter under test is obtained;

[0023] The obtained inductor current is extracted using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0024] The obtained output voltage is subjected to fundamental wave extraction and derivative calculation using a second-order generalized integrator to obtain the fundamental wave derivative of the output voltage;

[0025] Calculating the fundamental wave of the capacitor current according to the fundamental wave derivative of the output voltage and the nominal capacitance value, and calculating the fundamental wave of the output current of the auxiliary converter under test according to the fundamental wave of the inductor current and the fundamental wave of the capacitor current;

[0026] Based on the calculated fundamental waves, the fourth-order Runge-Kutta method is used to solve the current state of the auxiliary converter.

[0027] Furthermore, the transfer function of the second-order generalized integrator is The fundamental wave of the output current is expressed as:

[0028] io =i f -i c

[0029]

[0030]

[0031] Among them, ω is the angular frequency of the fundamental signal, k is the gain coefficient, i o is the output current, i f is the fundamental wave of the inductor current, i c is the fundamental wave of capacitor current, C is the capacitance of filter capacitor, and u is the output voltage.

[0032] Furthermore, after solving the current state of the auxiliary converter according to the calculated fundamental waves, a fault diagnosis step is also included, including:

[0033] comparing the difference between the calculated two-phase output currents in the auxiliary converter under test and the measured values ​​of the output current sensors of the two phases in the auxiliary converter under test;

[0034] If the difference between the measured values ​​of the output current sensors of the two phases is greater than a first preset threshold value, and the difference between the calculated values ​​of the output currents of the two phases is less than a second preset threshold value, it is determined that the output current sensor is faulty;

[0035] If the difference between the measured values ​​of the two-phase output current sensors is less than the second preset threshold and the difference between the calculated values ​​of the two-phase output currents is greater than the first preset threshold, it is determined that the output current sensor is normal and other sensors are faulty. The final fault location is determined by comparing the measured values ​​of each sensor with the corresponding calculated values.

[0036] A method for diagnosing the state of an auxiliary converter, comprising the steps of:

[0037] When the output contactor of the auxiliary converter under test is not closed, diagnose the state of the filter circuit of the auxiliary converter under test according to the first diagnostic method to obtain a first diagnostic result;

[0038] After the output contactor of the auxiliary converter under test is closed, the state of the filter circuit of the auxiliary converter under test is diagnosed according to the second diagnostic method to obtain a second diagnostic result;

[0039] A final diagnosis result is obtained according to the first diagnosis result and the second diagnosis result.

[0040] An auxiliary converter state diagnosis device, comprising:

[0041] A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test when the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed;

[0042] A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0043] A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0044] A capacitance calculation module, used to calculate the capacitance of the capacitor in the auxiliary converter filter circuit under test according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage;

[0045] The fault judgment module is used to judge the fault state of the capacitor of the filter circuit according to the calculated capacitance value.

[0046] An auxiliary converter state diagnosis device, comprising:

[0047] A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current after the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is closed, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test;

[0048] A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0049] A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0050] A calculation module, used to calculate the fundamental wave of the capacitor current according to the fundamental wave derivative of the output voltage and the nominal capacitance value, and calculate the fundamental wave of the output current of the auxiliary converter under test according to the fundamental wave of the inductor current and the fundamental wave of the capacitor current;

[0051] The state solving module is used to solve the current state of the auxiliary converter according to the calculated fundamental waves.

[0052] An auxiliary converter state diagnosis system, comprising:

[0053] A first diagnostic device, used for diagnosing the state of the filter circuit of the auxiliary converter under test according to the first diagnostic method when the output contactor of the auxiliary converter under test is not closed, and obtaining a first diagnostic result output;

[0054] A second diagnostic device, used to diagnose the state of the filter circuit of the auxiliary converter under test according to the second diagnostic method after the output contactor of the auxiliary converter under test is closed, to obtain a second diagnostic result;

[0055] The diagnosis output device is used to obtain a final diagnosis result output according to the first diagnosis result and the second diagnosis result.

[0056] An electronic device comprises a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program to perform the above method.

[0057] A computer-readable storage medium storing a computer program, wherein the computer program implements the above method when executed by a processor.

[0058] Compared with the prior art, the advantages of the present invention are:

[0059] 1. The present invention utilizes the relationship between the bridge arm current and the capacitor current when the auxiliary converter under test is started and the output contactor is not closed, and uses the sensor data inside the auxiliary converter to calculate the capacitance in real time. The fault state of the capacitor in the filter circuit is judged according to the calculated capacitance, and the fault state of the capacitor can be accurately predicted in advance, so as to perform protection in advance. At the same time, the fundamental wave of the voltage and current and the derivative of the fundamental wave of the output voltage are calculated in real time by utilizing the bandpass characteristics of the second-order generalized integrator, so as to obtain current and voltage derivative signals without high-order harmonics, avoid high-frequency noise interference, and also avoid phase delay and amplitude loss, so as to obtain the fundamental wave and corresponding derivative information of the circuit state without phase and amplitude deviation, effectively improve the accuracy of the capacitance calculation, and do not need to increase the hardware cost, which can greatly reduce the implementation cost and complexity. At the same time, the state diagnosis can be performed in real time during the normal operation of the auxiliary converter, and will not affect the real-time control and normal operation of the auxiliary inverter.

[0060] 2. The present invention combines the inductor current and the output voltage detected by the sensor inside the auxiliary converter, and uses the fundamental wave of the inductor current and the derivative of the fundamental wave of the output voltage to calculate the fundamental wave of the output current. Based on the fundamental waves, the circuit state of the auxiliary converter can be solved. The real-time state diagnosis and converter state monitoring of the auxiliary converter can be quickly realized without the need for additional hardware equipment, and the arrangement of sensors can be minimized without affecting the normal operation of the auxiliary converter. At the same time, by using the bandpass characteristics of the second-order generalized integrator to calculate the fundamental wave of the voltage and current and the derivative of the fundamental wave of the output voltage in real time, current and voltage derivative signals without high-order harmonics can be obtained. At the same time, phase delay and amplitude loss can be avoided, effectively ensuring the calculation accuracy of the output current, thereby improving the state diagnosis accuracy of the auxiliary converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a structural schematic diagram of the vehicle auxiliary converter.

[0062] Figure 2 The figure is a schematic diagram of the specific structure and control principle of an auxiliary converter using a two-level inverter.

[0063] Figure 3 It is a schematic diagram of the implementation flow of the auxiliary converter status diagnosis method according to Example 1 of the present invention.

[0064] Figure 4 It is a schematic diagram of the control principle of the auxiliary converter in Example 1 of the present invention.

[0065] Figure 5 It is a schematic diagram of the implementation flow of the auxiliary converter status diagnosis method in Example 2 of the present invention. DETAILED DESCRIPTION

[0066] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0067] As shown in the disclosure of the present invention, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. The words "first", "second" and similar words used in the disclosure of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the words "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0068] Take the auxiliary converter using two-level inverter as an example. Figure 2As shown, a filter circuit is provided at the output end of the auxiliary converter, and the filter circuit includes an output filter inductor L and an output filter capacitor C. The output filter capacitor C adopts a triangle connection method. The output end of the auxiliary converter controls the output to be turned on and off through the output contactor KMA. The auxiliary converter is provided with an input current sensor SC1 for detecting the input current, sensors SC2 and SC3 provided at the inductor input end for detecting the bridge arm current, an input voltage sensor SV1 for detecting the input voltage, a sensor SV2 for detecting the capacitor voltage at the DC input end, and output voltage sensors SV3 and SV4 for detecting the output voltage. The auxiliary converter is controlled by a control unit, which can specifically adopt a high-performance digital controller to accurately collect the output voltage of the auxiliary inverter and control it in combination with the DC voltage and output current. The control unit specifically includes digital input and output DIO, analog input APA, pulse conversion, logic control SMC, signal processing LSC, digital operation ACC, etc. If the filter capacitor C fails, such as the actual inductor and capacitor capacity decreases, the filter circuit will not be able to filter out high-order harmonics according to the predetermined design, which will cause the output voltage harmonic content of the auxiliary inverter to increase, thereby affecting the output voltage performance of the auxiliary inverter.

[0069] The filter capacitor in the filter circuit of the auxiliary converter meets the following requirements:

[0070]

[0071] Where C is the capacitance of the output filter capacitor, u is the voltage across the filter capacitor, and i c is the current of the filter capacitor.

[0072] It can be seen from formula (1) that to calculate the capacitance of the filter capacitor, it is necessary to determine the voltage and current at both ends of the filter capacitor and perform derivative calculations. Although the capacitor current can be obtained through the inductor current sensor before the contactor is closed, it contains a large number of high-order harmonic components, and the fundamental wave and derivative calculation of the voltage and current signals cannot be directly detected by the hardware sensor inside the auxiliary converter. If the detection is performed by sensors and other detection equipment, the implementation cost will increase, and the differential derivative will produce a large high-frequency noise interference. If a low-pass filter is used, it will also bring a certain phase delay and amplitude loss, which is not conducive to real-time state calculation. The second-order generalized integrator has a bandpass characteristic and can generate a 90-degree phase difference signal. The second-order generalized integrator can output an orthogonal signal to obtain the fundamental wave derivative information of the phase voltage, and the obtained signal does not contain harmonic information. The present invention takes the above-mentioned problem into consideration, and obtains the inductor current and output voltage detected by the internal sensor of the auxiliary converter when the output contactor of the auxiliary converter under test is not closed, and uses the bandpass characteristics of the second-order generalized integrator to calculate the fundamental wave of the voltage and current and the derivative of the fundamental wave of the output voltage in real time, so as to effectively obtain the current and voltage derivative signals without high-order harmonics, avoid high-frequency noise interference, and at the same time avoid phase delay and amplitude loss, and obtain the fundamental wave and corresponding derivative information of the circuit state without phase and amplitude deviation, so as to utilize the obtained fundamental wave and derivative information in combination with the detection signal of the internal sensor of the auxiliary converter, so as to realize the state diagnosis of the filter circuit in real time and accurately during the normal operation of the auxiliary converter, without relying on additional hardware detection equipment or complex control process.

[0073] Embodiment 1:

[0074] Considering that when the auxiliary converter is started but the output contactor KMA is not closed, the output current i o is 0, at this time the inductor current i L That is the capacitor current i c , the inductor current i can be detected by the sensor SC2 / SC3 inside the auxiliary converter. L , and then get the capacitor current i c , and then the real-time output voltage value detected by the output voltage sensors SV3 and SV4 inside the auxiliary converter is used to obtain the fundamental wave of the current and the fundamental wave derivative of the voltage using a second-order generalized integrator. Then, the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage are combined with formula (1) to quickly and accurately calculate the capacitance of the filter capacitor.

[0075] like Figure 3 As shown, the steps of the auxiliary converter state diagnosis method in this embodiment include:

[0076] Step S01. When the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed, current data detected by a sensor on the input side of a filter inductor in a filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and an output voltage detected by an output voltage sensor in the auxiliary converter under test is obtained;

[0077] Step S02: extracting the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0078] Step S03. Use a second-order generalized integrator to extract the fundamental wave of the obtained output voltage and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0079] Step S04. Calculate the capacitance value of the capacitor in the measured auxiliary converter filter circuit according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage;

[0080] Step S05 determines the fault state of the capacitor of the filter circuit according to the calculated capacitance value.

[0081] This embodiment uses the relationship between the bridge arm current and the capacitor current when the auxiliary converter under test is started and the output contactor is not closed, and uses the sensor data inside the auxiliary converter to calculate the capacitance value in real time. The fault state of the capacitor in the filter circuit is judged according to the calculated capacitance value, and the fault state of the capacitor can be accurately predicted in advance, so as to perform protection in advance. At the same time, the fundamental wave of the voltage and current and the derivative of the output voltage fundamental wave are calculated in real time by using the bandpass characteristics of the second-order generalized integrator, so as to obtain current and voltage derivative signals without high-order harmonics, avoid high-frequency noise interference, and also avoid phase delay and amplitude loss, so as to obtain the fundamental wave and corresponding derivative information of the circuit state without phase and amplitude deviation, effectively improve the accuracy of the capacitance value calculation, and do not need to increase the hardware cost, which can greatly reduce the implementation cost and complexity. At the same time, the state diagnosis can be performed in real time during the normal operation of the auxiliary converter, and will not affect the real-time control and normal operation of the auxiliary inverter.

[0082] In this embodiment, the transfer function of the second-order generalized integrator is specifically: Among them, ω is the angular frequency of the fundamental signal, and k is the gain coefficient, which determines the filtering performance and response speed of the second-order generalized integrator. Specifically, 1.414 can be selected. The second-order generalized integrator is used to extract the fundamental wave of the inductor current. The expression of the fundamental wave of the inductor current is:

[0083]

[0084] The derivative information of the output voltage fundamental wave is obtained by using a second-order generalized integrator:

[0085]

[0086] In this embodiment, the capacitance C of the capacitor in the measured auxiliary converter filter circuit is calculated according to the derivative of the inductor current fundamental wave and the output voltage in accordance with the following formula:

[0087]

[0088] Among them, i f is the capacitor current fundamental wave, is the fundamental derivative of the output voltage.

[0089] In this way, the capacitance value C is calculated. No additional hardware equipment is required. The capacitance value C can be calculated accurately and in real time during the normal operation of the auxiliary converter, and the fault state of the filter capacitor can be diagnosed in real time.

[0090] In this embodiment, detecting the inductor current in the auxiliary converter filter circuit under test also includes filtering the detected current through a bandpass filter to filter out other frequency signals, further avoiding high-frequency noise interference and phase delay and amplitude loss, and ensuring detection accuracy.

[0091] like Figure 4 As shown, V ref is the reference output voltage, V o is the actual output voltage, H2(s) is the voltage loop PI controller, K pwm is equivalent to the amplification factor of the inverter bridge, L is the inductance value, r is the equivalent series resistance of the inductor, and C is the actual capacitance value. When the auxiliary converter is running, the control error is obtained by comparing the output voltage with the reference voltage. After passing through the PI controller, the output control quantity controls the inverter bridge switch tube to generate a voltage pulse, and then passes through the low-pass filter circuit composed of the inductor and capacitor to obtain a sinusoidal output voltage. The inductor current detected by the bridge arm current sensor is used as the capacitor current i c Input to the first second-order generalized integrator (the transfer function is expressed as ) calculates the current fundamental wave and converts the output voltage V o Input to the second second-order generalized integrator (transfer function is expressed as ) calculates the voltage fundamental derivative, and connects the output ends of the first second-order generalized integrator and the second second-order generalized integrator to a divider respectively to calculate the capacitance value in real time.

[0092] In this embodiment, judging the fault state of the capacitor of the filter circuit according to the calculated capacitance value includes: comparing the calculated capacitance value with the nominal capacitance value, and if the deviation value exceeds the preset threshold, judging that the capacitor in the auxiliary converter filter circuit is damaged. Under normal circumstances, the calculated capacitance value is not much different from the nominal capacitance value. When there is a large deviation between the calculated actual capacitance value and the nominal capacitance value, it can be judged that the capacitor is damaged, and rapid real-time fault diagnosis can be achieved.

[0093] The auxiliary converter state diagnosis device of this embodiment includes:

[0094] A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test when the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed;

[0095] A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0096] A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0097] A capacitance calculation module is used to calculate the capacitance of the capacitor in the measured auxiliary converter filter circuit according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage;

[0098] The fault judgment module is used to judge the fault state of the capacitor of the filter circuit according to the calculated capacitance value.

[0099] In this embodiment, the current processing module specifically adopts a first second-order generalized integrator to input the inductor current detected by the current detection module as the capacitor current, and obtains the capacitor current fundamental output after second-order generalized integration. The voltage processing module adopts a second second-order generalized integrator to input the output voltage detected by the voltage processing module, and obtains the fundamental derivative output of the output voltage after second-order generalized integration.

[0100] In this embodiment, the capacitance value calculation module includes a divider, which inputs the capacitor current fundamental wave i f And the fundamental derivative of the output voltage according to Calculate the capacitance C of the measured auxiliary converter filter circuit.

[0101] The auxiliary converter state diagnosis device of this embodiment corresponds to the auxiliary converter state diagnosis method described above one by one, and will not be described in detail here.

[0102] Embodiment 2:

[0103] During operation, the auxiliary converter needs to pay attention to the status of each component in the converter. In practice, only the bridge arm current sensor and the output voltage sensor may be arranged, and no other sensors (such as the output current sensor) are arranged, so the status information such as the output current of the auxiliary converter cannot be obtained. To monitor the various states of the auxiliary converter, it is necessary to add other sensors. If various sensors are added, not only is the implementation cost high, but also because the inductor current on the AC side of the auxiliary converter contains high-order harmonics, it will also generate large high-frequency noise interference, making it difficult to perform real-time calculations. If a low-pass filter is used, it will bring certain phase delays and amplitude losses, which is not conducive to real-time state calculations.

[0104] As Figure 2 Taking the DC side inductor current of the auxiliary converter as an example, the actual inductance in the circuit is often different from the inductance in the ideal state, so it can be equivalent to the ideal inductance plus an equivalent series resistance. Assume is the voltage on the ideal inductor, rx1 is the voltage on the equivalent series resistance of the inductor, then the voltage on the actual inductor is equal to That is, it satisfies the following formula:

[0105]

[0106] Where x1 represents the inductor current.

[0107] Then the input voltage is equal to the inductor voltage plus the capacitor voltage, which is Then we can get the following observer:

[0108]

[0109] in Represents the observed value of the inductor current.

[0110] Subtracting the above two equations, we can get:

[0111]

[0112] in Represents the error between the observed value and the actual value.

[0113] Then there is That is, when time approaches infinity, the observed value minus the true value is 0, which means that the observed value is equal to the true value. Therefore, by constructing an observer, the DC side inductor current can be observed in real time, that is, the calculation of the DC side inductor current can be achieved using the first-order Euler iteration method or the fourth-order Runge-Kutta method, for example:

[0114]

[0115] Where k represents the sampling time, T represents the interval between two sampling points, and substitute it into have:

[0116]

[0117] According to the above formula, the value of x at the next moment (k+1 moment) can be obtained from the value at moment k.

[0118] For the AC side of the auxiliary converter, when the auxiliary converter is started but the output contactor KMA is closed, the output current i o The inductor current i L With the capacitor current i c The difference between o =i f -i c As shown in formula (1), the capacitor current i c The output voltage derivative can be used to calculate the value. In this embodiment, without adding additional sensors, the real-time value of the output voltage is detected by the output voltage sensors SV3 and SV4 inside the auxiliary converter, and then its fundamental derivative is obtained by a second-order generalized integrator, thereby obtaining the capacitor current i c , combined with the inductor current i detected by the sensor SC2 / SC3 inside the auxiliary converter L , and then use the fundamental wave of the inductor current to calculate the output current i o , and then solve the state of the filter circuit in the current auxiliary converter according to the calculated fundamental waves, so that the diagnosis of various states of the auxiliary converter can be quickly realized without adding additional hardware equipment, avoiding the addition of additional sensors and other equipment, and will not affect the normal operation of the auxiliary converter. At the same time, by utilizing the bandpass characteristics of the second-order generalized integrator, the fundamental waves of the voltage and current and the derivative of the output voltage fundamental wave are calculated in real time, and the current and voltage derivative signals without high-order harmonics are obtained to avoid high-frequency noise interference. At the same time, phase delay and amplitude loss can be avoided, and the fundamental wave and corresponding derivative information of the circuit state without phase and amplitude deviation are obtained, thereby ensuring the accuracy of diagnosis.

[0119] like Figure 5 As shown, the steps of the auxiliary converter status diagnosis method in this embodiment include:

[0120] S01. After the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is closed, the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and the output voltage detected by the output voltage sensor in the auxiliary converter under test is obtained;

[0121] S02. Extracting the fundamental wave of the obtained inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0122] S03. Extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0123] S04. Calculate the fundamental of the capacitor current according to the fundamental derivative of the output voltage and the nominal capacitance value, and calculate the fundamental of the output current of the auxiliary converter under test according to the fundamental of the inductor current and the fundamental of the capacitor current;

[0124] S05. Determine the state of the filter circuit in the current auxiliary converter according to the calculated fundamental waves.

[0125] In this embodiment, the transfer function of the second-order generalized integrator used is specifically: Among them, ω is the angular frequency of the fundamental signal, and k is the gain coefficient, which determines the filtering performance and response speed of the second-order generalized integrator, and can be specifically 1.414. Differential derivation will produce a large high-frequency noise dryness, and the low-pass filter will bring a certain phase delay, which is not conducive to real-time state calculation. This embodiment uses a second-order generalized integrator to extract the fundamental wave of the inductor current and output voltage and perform derivative calculations, so as to obtain the fundamental wave and corresponding derivative information of the circuit state without phase and amplitude deviation, and then obtain the accurate real-time output current fundamental wave component, so that the state of the auxiliary converter can be diagnosed in real time.

[0126] In this embodiment, the fundamental wave of the inductor current obtained by using a second-order generalized integrator can be specifically expressed as:

[0127]

[0128] The fundamental wave of the capacitor current obtained by the second-order generalized integrator can be expressed as:

[0129]

[0130] Among them, C is the capacitance of the filter capacitor and u is the output voltage.

[0131] The fundamental wave of the output current is:

[0132] i o =i f -i c (9)

[0133] In this embodiment, the fourth-order Runge-Kutta method can be used to solve the problem in step S05, that is, after extracting the above-mentioned fundamental waves, the data is substituted into the fourth-order Runge-Kutta method for solving, and the state information of the converter can be obtained. The solved information of the inductor current and output voltage in the solved state information is further compared with the detection information of the internal sensors of the converter (bridge arm current sensor, output voltage sensor), and it is determined whether the converter has a fault. If the comparison results are consistent, it indicates that the sensor has no fault, and the other solved state information can be fully used. If the error exceeds a certain range, it is determined that there is a fault and it is necessary to report the fault for repair.

[0134] This embodiment uses the data from the internal sensors of the auxiliary converter to quickly solve the circuit status, and then combines the solution result with the data from the internal sensors of the auxiliary converter to perform fault diagnosis. It can fully utilize the data from the internal sensors of the auxiliary converter to realize fault diagnosis and converter status monitoring, while minimizing the setting of additional sensors, so that the status of the converter can be effectively monitored with as few sensors as possible.

[0135] It is understandable that, in addition to the fourth-order Runge-Kutta method, other solution methods can also be used to solve the circuit state.

[0136] This embodiment further includes a fault diagnosis step S06 after solving the current state of the auxiliary converter according to the calculated fundamental waves. The specific steps of step S06 include:

[0137] Step S601. Compare the difference between the two-phase output currents calculated in the auxiliary converter under test, and compare the measured values ​​of the output current sensors of the two phases in the auxiliary converter under test;

[0138] Step S602. If the difference between the measured values ​​of the two-phase output current sensors is greater than a first preset threshold and the difference between the calculated values ​​of the two-phase output currents is less than a second preset threshold, it is determined that the output current sensor is faulty;

[0139] Step S603. If the difference between the measured values ​​of the two-phase output current sensors is less than the second preset threshold and the difference between the calculated values ​​of the two-phase output currents is greater than the first preset threshold, it is determined that the output current sensor is normal and other sensors are faulty, and the final fault location is determined by comparing the measured values ​​of each sensor with the corresponding calculated values.

[0140] Considering that sensors are usually installed on two of the three phases in the auxiliary converter, and that two-phase sensors usually do not have multiple faults at the same time, if output sensors are installed on two of the phases of the auxiliary converter, the measured values ​​of the output sensors should be consistent with the output current values ​​calculated above. Therefore, in the case where the auxiliary converter is equipped with two-phase output sensors, the above scheme can be used to implement output sensor fault diagnosis. Specifically, after solving the output current of the auxiliary converter using the above method of this embodiment, the measured values ​​of the output current sensors of the two phases are compared. If there is a large difference, that is, an imbalance occurs, and the calculated output current values ​​are not much different, then it is determined that the output current sensor is faulty; if the measured values ​​of the output current sensors of the two phases are not much different, but the calculated output current values ​​of the two phases are very different, then it is determined that the output current sensor is normal, and there are other sensors that are abnormal, such as the inductor current sensor or the output voltage sensor. Furthermore, the madman compares the measured data of each sensor with the corresponding calculated data to finally determine the fault location. Taking the judgment of the inductor current sensor as an example, the measured value of the inductor current sensor is compared with the solved inductor current value. If they are consistent, the inductor current sensor is judged to be normal, otherwise it is judged that the inductor current sensor is faulty.

[0141] When solving the above AC inductor current value, the specific calculation formula is:

[0142]

[0143] The above equation can be solved in a similar way to the calculation of the DC side inductor current, using the first-order Euler method or the fourth-order Runge-Kutta method.

[0144] If the state of the AC output voltage sensor is determined, the output voltage is calculated according to the following formula:

[0145]

[0146] Among them U out is the output voltage, U B is the output of the inverter bridge. This variable is generated by the control and is therefore known in real time. f It is the fundamental wave of the inductor current extracted by a second-order generalized integrator.

[0147] It is understandable that, in addition to the above-mentioned calculation method, the calculation formulas for the inductor current, output voltage, etc. can also be determined in a specific calculation method based on the actual circuit structure.

[0148] The auxiliary converter state diagnosis device of this embodiment includes:

[0149] A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test when the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed;

[0150] A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current;

[0151] A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage;

[0152] A capacitance calculation module, used to calculate the capacitance of the capacitor in the auxiliary converter filter circuit under test according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage;

[0153] The fault judgment module is used to judge the fault state of the capacitor of the filter circuit according to the calculated capacitance value.

[0154] The auxiliary converter state diagnosis device of this embodiment corresponds to the auxiliary converter state diagnosis method described above one by one, and thus will not be described in detail again.

[0155] Embodiment 3:

[0156] The steps of the auxiliary converter status diagnosis method in this embodiment include:

[0157] When the output contactor of the auxiliary converter under test is not closed, diagnose the state of the filter circuit of the auxiliary converter under test according to the diagnostic method of embodiment 1 to obtain a first diagnostic result;

[0158] After the output contactor of the auxiliary converter under test is closed, the state of the filter circuit of the auxiliary converter under test is diagnosed according to the diagnostic method of embodiment 2 to obtain a second diagnostic result;

[0159] A final diagnosis result is obtained according to the first diagnosis result and the second diagnosis result.

[0160] According to the diagnostic method of Example 1, the fault state of the filter capacitor in the filter circuit can be diagnosed in real time without adding hardware before the output contactor of the auxiliary converter under test is closed. However, it is not suitable for the scenario after the output contactor of the auxiliary converter under test is closed. This embodiment combines the advantages of both and adopts different diagnostic methods to perform diagnosis in different scenarios before the output contactor of the auxiliary converter under test is closed and after the output contactor is closed. The two diagnostic results are combined to obtain the final diagnostic result, which can further improve the diagnostic accuracy and reliability.

[0161] In a specific application embodiment, when the final diagnostic result is obtained according to the first diagnostic result and the second diagnostic result, if the first diagnostic result and the second diagnostic result simultaneously diagnose the existence of a fault, it can be determined that there is a fault inside the auxiliary converter, and the two diagnostic results can be combined to determine the specific fault location; if the first diagnostic result and the second diagnostic result both diagnose that there is no fault, it can be determined that the auxiliary converter is in a normal state throughout the entire process before and after the output contactor of the output converter is closed, and the diagnostic accuracy can be improved by combining the two diagnostic results.

[0162] The auxiliary converter status diagnosis system of this embodiment includes:

[0163] A first diagnostic device, used to diagnose the state of the filter circuit of the auxiliary converter under test according to the diagnostic method of embodiment 1 when the output contactor of the auxiliary converter under test is not closed, and obtain a first diagnostic result output;

[0164] A second diagnostic device, used to diagnose the state of the filter circuit of the auxiliary converter under test according to the diagnostic method of embodiment 2 after the output contactor of the auxiliary converter under test is closed, to obtain a second diagnostic result;

[0165] The diagnosis output device is used to obtain a final diagnosis result output according to the first diagnosis result and the second diagnosis result.

[0166] In this embodiment, when the diagnostic output device obtains the final diagnostic result based on the first diagnostic result and the second diagnostic result, if the first diagnostic result and the second diagnostic result simultaneously diagnose the existence of a fault, it can be determined that there is a fault inside the auxiliary converter, and the two diagnostic results can be combined to determine the specific fault location. If the first diagnostic result and the second diagnostic result both diagnose that there is no fault, it can be determined that the auxiliary converter is in a normal state throughout the entire process before and after the output contactor of the output converter is closed, and the combination of the two diagnostic results can improve the diagnostic accuracy and reliability.

[0167] The auxiliary converter state diagnosis system of this embodiment corresponds to the auxiliary converter state diagnosis method described above, and will not be described in detail.

[0168] The present application also provides an electronic device, including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program to perform the above-mentioned diagnostic method.

[0169] The present application also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the above-mentioned diagnostic method is implemented.

[0170] Those skilled in the art will appreciate that the above-mentioned embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0171] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for diagnosing the state of an auxiliary converter, characterized in that the steps include: When the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed, current data detected by a sensor at the input side of a filter inductor in a filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and an output voltage detected by an output voltage sensor in the auxiliary converter under test is obtained; The obtained inductor current is extracted using a second-order generalized integrator to obtain the fundamental wave of the inductor current; The obtained output voltage is subjected to fundamental wave extraction and derivative calculation using a second-order generalized integrator to obtain the fundamental wave derivative of the output voltage; Calculating the capacitance value of the capacitor in the measured auxiliary converter filter circuit according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage; The fault state of the capacitor of the filter circuit is determined according to the calculated capacitance value.

2. The auxiliary converter state diagnosis method according to claim 1, characterized in that: The transfer function of the second-order generalized integrator is Among them, ω is the angular frequency of the fundamental signal, and k is the gain coefficient.

3. The auxiliary converter state diagnosis method according to claim 1, characterized in that: According to the fundamental wave of the inductor current and the derivative of the output voltage, the capacitance C of the capacitor in the measured auxiliary converter filter circuit is calculated according to the following formula: Among them, i f is the capacitor current fundamental wave, is the fundamental derivative of the output voltage.

4. The auxiliary converter state diagnosis method according to claim 1, characterized in that: The detecting of the inductor current in the filter circuit of the auxiliary converter under test also includes filtering the detected current through a bandpass filter.

5. The auxiliary converter state diagnosis method according to any one of claims 1 to 4, characterized in that: Determining the fault state of the capacitor in the filter circuit according to the calculated capacitance value includes: comparing the calculated capacitance value with the nominal capacitance value, and if the deviation value exceeds a preset threshold, determining that the capacitor in the auxiliary converter filter circuit is damaged.

6. A method for diagnosing the state of an auxiliary converter, characterized in that the steps include: After the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is closed, current data detected by a sensor at the input side of a filter inductor in a filter circuit of the auxiliary converter under test is obtained to obtain the inductor current, and an output voltage detected by an output voltage sensor in the auxiliary converter under test is obtained; The obtained inductor current is extracted using a second-order generalized integrator to obtain the fundamental wave of the inductor current; The obtained output voltage is subjected to fundamental wave extraction and derivative calculation using a second-order generalized integrator to obtain the fundamental wave derivative of the output voltage; Calculating the fundamental wave of the capacitor current according to the fundamental wave derivative of the output voltage and the nominal capacitance value, and calculating the fundamental wave of the output current of the auxiliary converter under test according to the fundamental wave of the inductor current and the fundamental wave of the capacitor current; The current state of the auxiliary converter is solved according to the calculated fundamental waves.

7. The auxiliary converter state diagnosis method according to claim 6, characterized in that: The state of the auxiliary converter is solved using the fourth-order Runge-Kutta method based on the obtained fundamental wave information.

8. The auxiliary converter state diagnosis method according to claim 6, characterized in that: The transfer function of the second-order generalized integrator is The fundamental wave of the output current is expressed as: i o =i f -i c Among them, ω is the angular frequency of the fundamental signal, k is the gain coefficient, i o is the output current, i f is the fundamental wave of the inductor current, i c is the fundamental wave of capacitor current, C is the capacitance of filter capacitor, and u is the output voltage.

9. The auxiliary converter state diagnosis method according to claim 6, 7 or 8, characterized in that: After solving the current state of the auxiliary converter according to the calculated fundamental waves, the method further includes a fault diagnosis step, including: comparing the difference between the calculated two-phase output currents in the auxiliary converter under test and the measured values ​​of the output current sensors of the two phases in the auxiliary converter under test; If the difference between the measured values ​​of the output current sensors of the two phases is greater than a first preset threshold value, and the difference between the calculated values ​​of the output currents of the two phases is less than a second preset threshold value, it is determined that the output current sensor is faulty; If the difference between the measured values ​​of the two-phase output current sensors is less than the second preset threshold and the difference between the calculated values ​​of the two-phase output currents is greater than the first preset threshold, it is determined that the output current sensor is normal and other sensors are faulty. The final fault location is determined by comparing the measured values ​​of each sensor with the corresponding calculated values.

10. A method for diagnosing the state of an auxiliary converter, characterized in that the steps include: When the output contactor of the auxiliary converter under test is not closed, diagnosing the state of the filter circuit of the auxiliary converter under test according to the diagnostic method described in any one of claims 1 to 5 to obtain a first diagnostic result; After the output contactor of the auxiliary converter under test is closed, diagnosing the state of the filter circuit of the auxiliary converter under test according to the diagnostic method according to any one of claims 6 to 9 to obtain a second diagnostic result; A final diagnosis result is obtained according to the first diagnosis result and the second diagnosis result.

11. An auxiliary converter state diagnosis device, characterized in that: include: A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test when the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is not closed; A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current; A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage; A capacitance calculation module, used to calculate the capacitance of the capacitor in the auxiliary converter filter circuit under test according to the fundamental wave of the inductor current and the fundamental wave derivative of the output voltage; The fault judgment module is used to judge the fault state of the capacitor of the filter circuit according to the calculated capacitance value.

12. An auxiliary converter status diagnosis device, characterized in that: include: A data acquisition module is used to obtain the current data detected by the sensor on the input side of the filter inductor in the filter circuit of the auxiliary converter under test to obtain the inductor current after the auxiliary converter under test is started and the output contactor of the auxiliary converter under test is closed, and to obtain the output voltage detected by the output voltage sensor in the auxiliary converter under test; A current processing module is used to extract the fundamental wave of the acquired inductor current using a second-order generalized integrator to obtain the fundamental wave of the inductor current; A voltage processing module is used to extract the fundamental wave of the obtained output voltage using a second-order generalized integrator and calculate the derivative to obtain the fundamental wave derivative of the output voltage; A calculation module, used to calculate the fundamental wave of the capacitor current according to the fundamental wave derivative of the output voltage and the nominal capacitance value, and calculate the fundamental wave of the output current of the auxiliary converter under test according to the fundamental wave of the inductor current and the fundamental wave of the capacitor current; The state solving module is used to solve the current state of the auxiliary converter according to the calculated fundamental waves.

13. An auxiliary converter status diagnosis system, characterized in that: include: A first diagnostic device, used for diagnosing the state of the filter circuit of the auxiliary converter under test according to the diagnostic method according to any one of claims 1 to 5 when the output contactor of the auxiliary converter under test is not closed, and obtaining a first diagnostic result output; A second diagnostic device, for diagnosing the state of the filter circuit of the auxiliary converter under test according to the diagnostic method according to any one of claims 6 to 9 after the output contactor of the auxiliary converter under test is closed, to obtain a second diagnostic result; The diagnosis output device is used to obtain a final diagnosis result output according to the first diagnosis result and the second diagnosis result.

14. An electronic device comprising a processor and a memory, wherein the memory is used to store a computer program, wherein: The processor is configured to execute the computer program to perform the method according to any one of claims 1 to 10.

15. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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