Electromagnetic interference detection method and device for power wire harness and related assembly

Abstract

The invention discloses an electromagnetic interference detection method and device for a power wire harness, and a related assembly. The method comprises the steps: collecting an electromagnetic signal of the power wire harness in real time; preprocessing the electromagnetic signal to generate a digital signal; performing interference intensity analysis on the digital signal to obtain electromagnetic interference intensity; judging whether the electromagnetic interference intensity reaches a preset threshold value or not; if the electromagnetic interference intensity reaches a preset threshold value, it is judged that electromagnetic interference exists in the power wire harness. By collecting the electromagnetic signals of the power wire harness in real time, the abnormal state of the power wire harness can be rapidly detected, an alarm is given in time, and equipment shutdown or damage caused by faults of the power wire harness is avoided. And the electromagnetic interference intensity of the power wire harness on external signals can be accurately evaluated, and a basis is provided for the electromagnetic compatibility design of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of wiring harnesses, and in particular to a method and device for detecting electromagnetic interference of a power wiring harness and related components. Background Art

[0002] In modern industrial and electronic equipment, power harnesses, as core components for power transmission, are widely used in various automation systems, electric drive devices, and industrial equipment. However, power harnesses are prone to failure during operation due to faults such as short circuits, open circuits, and poor contact. This not only affects the normal operation of the equipment but can also cause serious electromagnetic interference (EMI) problems.

[0003] Electromagnetic interference (EMI) refers to the inability of a device or system to operate normally in an electromagnetic environment due to interference from external electromagnetic signals, or the interference of electromagnetic signals generated by the device or system itself with other devices or systems. In complex electromagnetic environments such as industrial production sites and data centers, the high-frequency harmonics, transient voltage fluctuations, and radiated electromagnetic fields generated by power wiring harnesses can significantly interfere with nearby sensitive equipment.

[0004] Traditional detection methods typically rely on manual inspections or simple current and voltage measurements, which have the following limitations:

[0005] 1. Manual inspections are difficult to achieve continuous monitoring and cannot capture transient faults or dynamically changing electromagnetic interference;

[0006] 2. Current and voltage measurements only reflect the state of power transmission and cannot directly quantify the electromagnetic interference intensity of the power harness. Summary of the Invention

[0007] The purpose of the present invention is to provide an electromagnetic interference detection method, device and related components for a power wiring harness, aiming to solve the problems that existing electromagnetic interference detection methods cannot capture transient faults or dynamically changing electromagnetic interference.

[0008] In a first aspect, an embodiment of the present invention provides a method for detecting electromagnetic interference of a power harness, comprising:

[0009] Real-time collection of electromagnetic signals from power harnesses;

[0010] Preprocessing the electromagnetic signal to generate a digital signal;

[0011] Performing interference intensity analysis on the digital signal to obtain electromagnetic interference intensity;

[0012] Determining whether the electromagnetic interference intensity reaches a predetermined threshold;

[0013] If the electromagnetic interference intensity reaches a predetermined threshold, it is determined that electromagnetic interference exists in the power harness.

[0014] In a second aspect, an embodiment of the present invention provides an electromagnetic interference detection device for a power harness, comprising:

[0015] Acquisition unit, used for collecting electromagnetic signals of power harness in real time;

[0016] a preprocessing unit, configured to preprocess the electromagnetic signal to generate a digital signal;

[0017] An analysis unit, configured to perform interference intensity analysis on the digital signal to obtain electromagnetic interference intensity;

[0018] a judging unit, configured to judge whether the electromagnetic interference intensity reaches a predetermined threshold;

[0019] A determination unit is configured to determine that electromagnetic interference exists in the power harness if the electromagnetic interference intensity reaches a predetermined threshold.

[0020] In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the electromagnetic interference detection method for the power harness described in the first aspect above is implemented.

[0021] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the electromagnetic interference detection method for the power harness described in the first aspect above is implemented.

[0022] The present invention discloses a method, device and related components for detecting electromagnetic interference of a power harness. The method includes: real-time acquisition of electromagnetic signals of the power harness; pre-processing of the electromagnetic signals to generate digital signals; interference intensity analysis of the digital signals to obtain electromagnetic interference intensity; judging whether the electromagnetic interference intensity reaches a predetermined threshold; if the electromagnetic interference intensity reaches the predetermined threshold, determining that electromagnetic interference exists in the power harness. By acquiring electromagnetic signals of the power harness in real time, the present invention can quickly detect abnormal conditions of the power harness and issue an alarm in a timely manner, thereby avoiding equipment shutdown or damage due to power harness failure. It can also accurately evaluate the electromagnetic interference intensity of the power harness to external signals, providing a basis for the electromagnetic compatibility design of the equipment. The embodiments of the present invention also provide an electromagnetic interference detection device for a power harness, a computer-readable storage medium and a computer device, which have the above-mentioned beneficial effects and are not repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 The figure is a flow chart of a method for detecting electromagnetic interference of a power harness;

[0025] Figure 2 The figure is a schematic block diagram of an electromagnetic interference detection device for a power harness. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0030] See also Figure 1 This embodiment provides a method for detecting electromagnetic interference of a power harness, comprising:

[0031] S101: Real-time acquisition of electromagnetic signals from the power harness;

[0032] This embodiment implements real-time monitoring of the power harness's operating status by deploying a magnetic induction electromagnetic signal acquisition sensor. The sensor, with its non-contact design, adheres closely to the harness's surface and collects electromagnetic signals in real time by detecting changes in the electromagnetic field around the harness (including magnetic field strength and frequency distribution).

[0033] S102: Preprocessing the electromagnetic signal to generate a digital signal;

[0034] Specifically, the collected electromagnetic signals are filtered (to remove environmental noise), amplified (to enhance weak signals) and analog-to-digital converted (to digital signals) by the signal processing unit, ensuring high fidelity and low latency of the signals.

[0035] More specifically, a low-pass filter removes high-frequency noise above the target frequency band within the electromagnetic signal, while retaining the 50Hz fundamental and harmonic components (such as the 5th and 7th harmonics). To address the 50Hz power frequency interference common in industrial scenarios, a notch filter is further introduced to precisely suppress interference signals at 50Hz and its integer multiples. Furthermore, filter parameters can be dynamically adjusted (for example, increasing the bandwidth to 500kHz) to capture rapid changes in higher-order harmonics.

[0036] The filtered electromagnetic signal is amplified by an adaptive gain control circuit. This circuit dynamically adjusts the amplification factor (e.g., adjustable from 0 to 60 dB) based on the signal amplitude, ensuring that both weak signals (such as local electromagnetic fluctuations caused by poor contact) and strong signals (such as transient interference during motor startup) are accurately captured. For example, if the amplitude of the fifth and seventh harmonics exceeds a preset threshold, the system automatically reduces the gain to avoid signal saturation and distortion.

[0037] The amplified analog signal is converted to a digital signal using a 24-bit high-precision analog-to-digital converter (ADC). The sampling rate is set to 2MSps to meet the sampling requirements of higher-order harmonics. The digital signal is stored in floating-point format and timestamped to ensure timing consistency for subsequent data analysis.

[0038] In some embodiments, the filter weights are adjusted in real time using the LMS algorithm, and the filter coefficients are updated using the iterative formula w(n+1)=w(n)+μ*e(n)*x(n), where w(n) is the current weight vector, μ is the step size parameter, e(n) is the error signal (the difference between the desired signal and the filter output), and x(n) is the input signal vector.

[0039] For 50Hz power frequency interference, a notch filter (IIR notch filter) is combined to provide a deep valley at 50Hz to attenuate the interference energy;

[0040] For high-frequency impulse noise, the fast convergence characteristic of the LMS algorithm is used to dynamically suppress transient noise, and the convergence speed and stability are balanced by adjusting the step size parameter μ.

[0041] S103: Perform interference intensity analysis on the digital signal to obtain electromagnetic interference intensity;

[0042] Specifically, the interference intensity of the digital signal is analyzed to obtain the electromagnetic interference intensity including:

[0043] The fundamental wave component and its higher harmonic components of the digital signal are extracted using the Fourier transform algorithm, and the energy value of the fundamental wave component and the energy value of each higher harmonic component are calculated;

[0044] The electromagnetic interference intensity is calculated based on the energy value of the fundamental wave component and the energy value of each higher harmonic component.

[0045] This embodiment converts time-domain electromagnetic signals into frequency-domain signals through Fourier transform, clearly separating the fundamental component (e.g., the 50Hz power frequency) from higher-order harmonic components (e.g., the 5th and 7th harmonics), thus avoiding the interference confusion caused by signal superposition in traditional time-domain analysis. Furthermore, by calculating the energy values ​​of the fundamental and harmonic components, the absolute intensity of electromagnetic interference can be quantified, avoiding the limitations of traditional methods that rely solely on voltage or current.

[0046] In this embodiment, calculating the energy value of the fundamental wave component includes:

[0047] Get the equivalent impedance of the power harness;

[0048] Extracting a fundamental component from the digital signal using a sliding window Fourier transform algorithm according to a first predetermined step size, and calculating an instantaneous voltage value of the fundamental component;

[0049] The energy value of the fundamental component is calculated according to the equivalent impedance, the instantaneous voltage value of the fundamental component and the first predetermined step size according to the following formula:

[0050]

[0051] Among them, E 基波 Indicates the energy value of the fundamental component; V 基波 (t) represents the instantaneous voltage value of the fundamental component; R represents the equivalent impedance; t1 and t2 represent the starting time and the ending time of the first predetermined step, respectively.

[0052] Furthermore, obtaining the equivalent impedance of the power harness includes deploying impedance measurement units at the input and output ends of the power harness, injecting a test signal of known frequency (such as a 50Hz fundamental wave or a 1kHz low-frequency signal), and measuring the amplitude and phase difference of the voltage and current to calculate the equivalent impedance R. For example, when the test signal is a sine wave, the equivalent impedance can be calculated using the formula R = V / I, where V and I are the root mean square values ​​of the voltage and current of the test signal, respectively.

[0053] However, the equivalent impedance of the power harness can fluctuate due to temperature, load changes, or cable aging. For example, when a variable-frequency motor starts, the cable impedance may decrease (e.g., from 0.5Ω to 0.3Ω) due to a sudden increase in current and a rise in temperature. This embodiment ensures that the equivalent impedance value always reflects the current state by periodically triggering impedance measurement (e.g., every 5 minutes) or actively triggering measurement during sudden load changes (e.g., equipment startup or shutdown).

[0054] In some embodiments, extracting the fundamental component from the digital signal using a sliding window Fourier transform algorithm according to a first predetermined step size, and calculating the instantaneous voltage value of the fundamental component includes:

[0055] The collected digital signal is divided into consecutive overlapping sliding windows (e.g., a window length of 20ms and a step size of 10ms). A fast Fourier transform (FFT) is performed on the digital signal within each sliding window. For example, in a device startup scenario, the sliding window is dynamically moved in 10ms steps to ensure that rapid changes in the fundamental amplitude are captured (e.g., the fundamental amplitude increases within tens of milliseconds when a variable frequency motor starts).

[0056] Then, within each sliding window, the signal's spectral characteristics are analyzed using FFT to locate the frequency domain energy peak of the 50Hz / 60Hz fundamental component. For example, when the power harness is operating in a 50Hz grid, the maximum amplitude at 50Hz is identified in the spectrum graph, and the corresponding fundamental component of the time domain signal is extracted.

[0057] Based on the fundamental spectrum data in the sliding window, the time domain waveform of the fundamental component is reconstructed through the inverse Fourier transform (IFFT), and the instantaneous voltage value at the center of each sliding window is extracted. For example, in a 10ms step window, if the fundamental amplitude is 220V, the instantaneous voltage value V at the center of the sliding window (such as the 5th ms) is calculated. 基波 (t) = 220*sin(2π*50*t).

[0058] In this embodiment, calculating the energy value of the high-order harmonic component includes:

[0059] Get the equivalent impedance of the power harness;

[0060] extracting higher harmonic components from the digital signal using a sliding window Fourier transform algorithm according to a second predetermined step size, and calculating instantaneous voltage values ​​of the higher harmonic components;

[0061] The energy value of the higher harmonic component is calculated according to the equivalent impedance, the instantaneous voltage value of the higher harmonic component and the second predetermined step size and the following formula:

[0062]

[0063] Among them, E n Indicates the energy value of high-order harmonic components; V n (t) represents the instantaneous voltage value of the higher harmonic component; R represents the equivalent impedance; t3 and t4 represent the starting time and the ending time of the second predetermined step, respectively.

[0064] Furthermore, extracting the higher harmonic components from the digital signal using a sliding window Fourier transform algorithm according to a second predetermined step size, and calculating the instantaneous voltage value of the higher harmonic components includes:

[0065] The collected digital signal is divided into continuous overlapping sliding windows, and a fast Fourier transform (FFT) is performed on the digital signal in each sliding window.

[0066] Then, within each sliding window, the system uses FFT analysis to analyze the signal's spectral characteristics and locate the frequency domain energy peaks of higher-order harmonic components, such as the 5th and 7th harmonics. For example, when the power harness is operating in a 50Hz grid, the system identifies the maximum amplitudes at 250Hz (5th harmonic) and 350Hz (7th harmonic) in the spectrum and extracts the corresponding higher-order harmonic components of the time domain signal.

[0067] Based on the high-order harmonic spectrum data in the sliding window, the time domain waveform of the high-order harmonic component is reconstructed through inverse Fourier transform (IFFT), and the instantaneous voltage value at the center of each window is extracted.

[0068] In some embodiments, the operating environment parameters of the power harness (such as temperature T and humidity H) are collected in real time through devices such as temperature sensors and humidity sensors;

[0069] The collected environmental parameters are then transmitted to the signal processing unit for preprocessing (such as filtering and normalization);

[0070] Then, according to the temperature-impedance relationship of the power harness material (such as the resistivity of the metal conductor ρ(T)=ρ0[1+α(T-T0)], where ρ0 is the resistivity at the reference temperature T0 and α is the temperature coefficient) and the effect of humidity on insulation resistance (such as Rinsulation(H)=R0*e -kH, where R0 is the insulation resistance under reference humidity, k is the humidity coefficient), and a correlation model between environmental parameters and equivalent impedance is constructed;

[0071] Then, the historical data is used to train a regression model (such as random forest, support vector regression) or a neural network model to predict the comprehensive impact of environmental parameters on equivalent impedance;

[0072] Then, based on the real-time environmental parameters temperature T and humidity H, the corrected equivalent impedance Rcorrected is calculated through the dynamic correction model. The formula is Rcorrected = Rinitial*f(T, H), where Rinitial is the uncorrected equivalent impedance and f(T, H) is the environmental parameter correction function.

[0073] The implementation of the correction function f(T, H) includes:

[0074] If the environmental impact is small, the linear model f(T, H) = aT + bH + c is used, where a, b, and c are preset coefficients;

[0075] If the environmental impact is significant, use polynomial fitting or exponential model f(T, H) = d*e fT +h*ln(H+r), where d, f, h, and r are fitting parameters;

[0076] The corrected equivalent impedance Rcorrected is substituted into the calculation formula of the energy value of the fundamental component and the energy value of the higher harmonic component to dynamically adjust the energy value of the fundamental component and the energy value of the higher harmonic component to eliminate the error caused by environmental fluctuations.

[0077] After calculating the energy value of the fundamental wave component and the energy value of each higher harmonic component, the electromagnetic interference intensity is calculated based on the energy value of the fundamental wave component and the energy value of each higher harmonic component, specifically including:

[0078] Calculate the electromagnetic interference intensity according to the following formula:

[0079]

[0080] Among them, E EMI Indicates the electromagnetic interference intensity; w0 indicates the fundamental wave weight; E 基波 Indicates the energy value of the fundamental component; w n Indicates the weight of the nth higher harmonic component; E n Represents the energy value of the nth higher harmonic component; N represents the total number of higher harmonic components.

[0081] Furthermore, the electromagnetic interference intensity is calculated according to the following formula:

[0082] Get the running status of the device;

[0083] If the equipment is in startup or load sudden change condition, increase the weight coefficient of high-order harmonic components;

[0084] If the equipment is in steady-state operation, reduce the weight coefficient of higher harmonic components and increase the weight of fundamental wave.

[0085] During equipment startup or sudden load changes, the system automatically increases the weighting of higher harmonic components (such as the 5th and 7th harmonics) and reduces the weighting of the fundamental harmonic. For example, when detecting that a variable-frequency motor is starting up and the 5th harmonic amplitude can reach 70% of the fundamental harmonic, the system will increase the weighting from the default value of 0.2 to 0.5, while reducing the weighting of the fundamental harmonic from 0.6 to 0.3. This adjustment emphasizes the significant impact of transient higher harmonics on electromagnetic interference and avoids underestimation of interference intensity due to dominance of the fundamental harmonic.

[0086] During steady-state operation, the weight of higher harmonics is reduced and the weight of the fundamental wave is increased. For example, when the device is operating at rated load and current fluctuations are less than 5%, the weight of the fifth harmonic is reduced from 0.2 to 0.1, while the weight of the fundamental wave is increased from 0.6 to 0.7. This adjustment reflects the dominant role of the fundamental wave in electromagnetic interference during long-term operation and prevents excessive amplification of small fluctuations in higher harmonics.

[0087] In some embodiments, after extracting the fundamental wave component and its higher harmonic components of the digital signal using a Fourier transform algorithm and calculating the energy value of the fundamental wave component and the energy value of each higher harmonic component, the method further includes:

[0088] Calculate the ratio of the energy value of the higher harmonic component to the energy value of the fundamental component to obtain the energy proportion of the higher harmonic component;

[0089] Determine whether the energy ratio exceeds the preset energy threshold;

[0090] If the energy ratio exceeds the preset energy threshold, it is determined that electromagnetic interference exists in the power harness.

[0091] In some embodiments, the energy ratio of the higher harmonics is calculated. For example, if the energy value of the 5th higher harmonic component is 150J and the energy value of the fundamental component is 200J, then the energy ratio of the higher harmonic component R5=75%.

[0092] If the percentage of any higher harmonic energy, Rn, exceeds a preset threshold (e.g., R5 > 70% or R7 > 60%), the system determines that electromagnetic interference is present in the power harness. For example, during the startup phase of a variable-frequency motor, if the 5th harmonic energy percentage is detected to be 75%, an alert is triggered and the current scenario is recorded.

[0093] S104: Determine whether the electromagnetic interference intensity reaches a predetermined threshold;

[0094] The preset thresholds can be dynamically adjusted based on actual needs. For example, in a variable-frequency motor startup scenario, the system defaults to raising the 5th and 7th harmonic thresholds to 80% and 70%, respectively, to accommodate the significant increase in transient higher-order harmonics. During steady-state operation, these thresholds return to 70% and 60%.

[0095] In some scenarios, the predetermined threshold may be set to 50 μT and the frequency range threshold may be set to 50 Hz-1 MHz.

[0096] S105: If the electromagnetic interference intensity reaches a predetermined threshold, it is determined that electromagnetic interference exists in the power harness.

[0097] Analysis of recorded data revealed that electromagnetic interference (EMI) intensity was high during device startup, potentially impacting the normal operation of surrounding equipment. Based on this data, the wiring plan was adjusted to increase the distance between the power harness and other sensitive equipment, and shielding measures were implemented to effectively reduce EMI.

[0098] In some specific embodiments, a single device utilizes 20 to 30 motors. The frequent starting and stopping of large motors, especially variable-frequency motors and especially multiple motors, as well as the electromagnetic fluctuations in the electric drive caused by changes in equipment load, can significantly disrupt the power grid and its lines. When medium- and high-power inverters start up, a large amount of high-order harmonic interference is generated. The 5th and 7th harmonic components are particularly large, and can even reach over 70% of the 50Hz fundamental wave. This can have a significant impact on the power grid and, in severe cases, affect the normal operation of other equipment within the same grid. If this impact is detected to exceed the power supply safety threshold for other equipment, standardized grounding measures must be implemented, filters and reactors must be added, and, if necessary, a separate isolation transformer must be added for signal isolation. At the same time, the carrier frequency must be reduced to minimize interference.

[0099] Furthermore, high-frequency components on transmission lines can severely impact both analog and nearby signals, both small and high-frequency, through radiation and conduction. This can severely distort system data and cause communication failures. If this impact exceeds the data distortion threshold, signal isolation modules must be added, cables separated and rerouted, and proper grounding of signal and power grounds must be ensured. Shielding of key cables should also be increased, if necessary.

[0100] This embodiment can quickly detect abnormal conditions of the power harness by collecting electromagnetic signals of the power harness in real time, and issue an alarm in a timely manner, thus avoiding equipment shutdown or damage due to power harness failure. By setting a predetermined threshold, the electromagnetic interference intensity of the power harness to external signals can be accurately evaluated, providing a basis for the electromagnetic compatibility design of the equipment. At the same time, by recording the electromagnetic interference status in specific scenarios, it facilitates subsequent analysis and optimization of wiring design, and improves the operating stability of the equipment in complex electromagnetic environments. In addition, the method of this embodiment is suitable for power harness monitoring of various industrial and electronic equipment, and has wide applicability and promotion value.

[0101] See also Figure 2 This embodiment provides an electromagnetic interference detection device 200 for a power harness, comprising:

[0102] The acquisition unit 201 is used to acquire electromagnetic signals of the power harness in real time;

[0103] A preprocessing unit 202 is used to preprocess the electromagnetic signal to generate a digital signal;

[0104] An analysis unit 203 is configured to perform interference strength analysis on the digital signal to obtain electromagnetic interference strength;

[0105] The judging unit 204 is configured to judge whether the electromagnetic interference intensity reaches a predetermined threshold;

[0106] The determination unit 205 is configured to determine that electromagnetic interference exists in the power harness if the electromagnetic interference intensity reaches a predetermined threshold.

[0107] Furthermore, the analysis unit 203 includes:

[0108] An extraction subunit, configured to extract the fundamental wave component and its higher harmonic components of the digital signal using a Fourier transform algorithm, and calculate the energy value of the fundamental wave component and the energy value of each higher harmonic component;

[0109] The interference intensity calculation subunit is used to calculate the electromagnetic interference intensity according to the energy value of the fundamental wave component and the energy value of each higher harmonic component.

[0110] Furthermore, the extraction subunit includes:

[0111] A first impedance acquisition subunit, configured to acquire an equivalent impedance of the power harness;

[0112] a fundamental component extraction subunit, configured to extract the fundamental component from the digital signal using a sliding window Fourier transform algorithm according to a first predetermined step size, and calculate an instantaneous voltage value of the fundamental component;

[0113] The fundamental component calculation subunit is configured to calculate the energy value of the fundamental component according to the equivalent impedance, the instantaneous voltage value of the fundamental component, and the first predetermined step size and in accordance with the following formula:

[0114]

[0115] Among them, E 基波 Indicates the energy value of the fundamental component; V 基波 (t) represents the instantaneous voltage value of the fundamental component; R represents the equivalent impedance; t1 and t2 represent the starting time and the ending time of the first predetermined step, respectively.

[0116] Furthermore, the extraction subunit further includes:

[0117] A second impedance acquisition subunit, configured to acquire the equivalent impedance of the power harness;

[0118] a voltage value calculation subunit, configured to extract a higher harmonic component from the digital signal according to a second predetermined step size using a sliding window Fourier transform algorithm, and calculate an instantaneous voltage value of the higher harmonic component;

[0119] The high-order harmonic component calculation subunit is used to calculate the energy value of the high-order harmonic component according to the equivalent impedance, the instantaneous voltage value of the high-order harmonic component and the second predetermined step size and according to the following formula:

[0120]

[0121] Among them, E n Indicates the energy value of high-order harmonic components; V n (t) represents the instantaneous voltage value of the higher harmonic component; R represents the equivalent impedance; t3 and t4 represent the starting time and the ending time of the second predetermined step, respectively.

[0122] Furthermore, the interference intensity calculation subunit includes:

[0123] The electromagnetic interference intensity calculation subunit is used to calculate the electromagnetic interference intensity according to the following formula:

[0124]

[0125] Among them, E EMI Indicates the electromagnetic interference intensity; w0 indicates the fundamental wave weight; E 基波 Indicates the energy value of the fundamental component; w n Indicates the weight of the nth higher harmonic component; E n Represents the energy value of the nth higher harmonic component; N represents the total number of higher harmonic components.

[0126] Furthermore, the electromagnetic interference intensity calculation subunit includes:

[0127] The device operation status acquisition subunit is used to obtain the operation status of the device;

[0128] Add a subunit to increase the weight coefficient of high-order harmonic components when the equipment is in startup or load sudden change conditions;

[0129] The reduction subunit is used to reduce the weight coefficient of the higher harmonic components and increase the fundamental wave weight if the equipment is in a steady-state operating condition.

[0130] Furthermore, the extraction subunit includes:

[0131] a ratio calculation subunit, configured to calculate the ratio of the energy value of the higher harmonic component to the energy value of the fundamental component, and obtain the energy proportion of the higher harmonic component;

[0132] A proportion judgment subunit, used to judge whether the energy proportion exceeds a preset energy threshold;

[0133] The interference determination subunit is configured to determine that electromagnetic interference exists in the power harness if the energy proportion exceeds a preset energy threshold.

[0134] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-mentioned devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0135] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, can implement the methods provided in the above embodiments. The storage medium may include: a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code.

[0136] The present invention further provides a computer device that may include a memory and a processor. The memory stores a computer program, and the processor, when invoking the computer program in the memory, can implement the method provided in the above embodiment. Of course, the computer device may also include various network interfaces, a power supply, and other components.

[0137] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0138] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive.

[0139] Inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A method for detecting electromagnetic interference of a power harness, characterized in that: include: Real-time collection of electromagnetic signals from power harnesses; Preprocessing the electromagnetic signal to generate a digital signal; Performing interference intensity analysis on the digital signal to obtain electromagnetic interference intensity; Determining whether the electromagnetic interference intensity reaches a predetermined threshold; If the electromagnetic interference intensity reaches a predetermined threshold, it is determined that electromagnetic interference exists in the power harness.

2. The electromagnetic interference detection method of the power harness according to claim 1, characterized in that: The performing interference intensity analysis on the digital signal to obtain electromagnetic interference intensity includes: Extracting the fundamental wave component and its higher harmonic components of the digital signal using a Fourier transform algorithm, and calculating the energy value of the fundamental wave component and the energy value of each higher harmonic component; The electromagnetic interference intensity is calculated according to the energy value of the fundamental wave component and the energy value of each higher harmonic component.

3. The electromagnetic interference detection method of the power harness according to claim 2, characterized in that: Calculating the energy value of the fundamental component includes: Obtaining the equivalent impedance of the power harness; Extracting a fundamental component from the digital signal using a sliding window Fourier transform algorithm according to a first predetermined step size, and calculating an instantaneous voltage value of the fundamental component; The energy value of the fundamental component is calculated according to the equivalent impedance, the instantaneous voltage value of the fundamental component and the first predetermined step size according to the following formula: Among them, E 基波 Indicates the energy value of the fundamental component; V 基波 (t) represents the instantaneous voltage value of the fundamental component; R represents the equivalent impedance; t1 and t2 represent the starting time and the ending time of the first predetermined step, respectively.

4. The electromagnetic interference detection method of a power harness according to claim 2, characterized in that: Calculating the energy value of the higher harmonic components includes: Obtaining the equivalent impedance of the power harness; extracting higher harmonic components from the digital signal using a sliding window Fourier transform algorithm according to a second predetermined step size, and calculating instantaneous voltage values ​​of the higher harmonic components; The energy value of the high-order harmonic component is calculated according to the equivalent impedance, the instantaneous voltage value of the high-order harmonic component and the second predetermined step size according to the following formula: Among them, E n Indicates the energy value of high-order harmonic components; V n (t) represents the instantaneous voltage value of the higher harmonic component; R represents the equivalent impedance; t3 and t4 represent the starting time and the ending time of the second predetermined step, respectively.

5. The electromagnetic interference detection method of a power harness according to claim 2, characterized in that: Calculating the electromagnetic interference intensity according to the energy value of the fundamental wave component and the energy value of each higher harmonic component includes: Calculate the electromagnetic interference intensity according to the following formula: Among them, E EMI Indicates the electromagnetic interference intensity; w0 indicates the fundamental wave weight; E 基波 Indicates the energy value of the fundamental component; w n Indicates the weight of the nth higher harmonic component; E n Represents the energy value of the nth higher harmonic component; N represents the total number of higher harmonic components.

6. The electromagnetic interference detection method of a power harness according to claim 5, characterized in that: The electromagnetic interference intensity is calculated according to the following formula: Get the running status of the device; If the equipment is in startup or load sudden change condition, increase the weight coefficient of high-order harmonic components; If the equipment is in steady-state operation, reduce the weight coefficient of higher harmonic components and increase the weight of fundamental wave.

7. The electromagnetic interference detection method of a power harness according to claim 2, characterized in that: The method further includes: extracting the fundamental wave component and the higher harmonic components of the digital signal by using the Fourier transform algorithm, and calculating the energy value of the fundamental wave component and the energy value of each higher harmonic component; Calculating the ratio of the energy value of the higher harmonic component to the energy value of the fundamental component to obtain the energy proportion of the higher harmonic component; Determining whether the energy ratio exceeds a preset energy threshold; If the energy proportion exceeds a preset energy threshold, it is determined that electromagnetic interference exists in the power harness.

8. An electromagnetic interference detection device for a power harness, characterized in that: include: Acquisition unit, used for collecting electromagnetic signals of power harness in real time; a preprocessing unit, configured to preprocess the electromagnetic signal to generate a digital signal; An analysis unit, configured to perform interference intensity analysis on the digital signal to obtain electromagnetic interference intensity; a judging unit, configured to judge whether the electromagnetic interference intensity reaches a predetermined threshold; A determination unit is configured to determine that electromagnetic interference exists in the power harness if the electromagnetic interference intensity reaches a predetermined threshold.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the electromagnetic interference detection method for a power wiring harness according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the electromagnetic interference detection method for a power harness according to any one of claims 1 to 7.

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