Compact box transformer vehicle electromagnetic compatibility evaluation method and system

Abstract

The invention discloses a compact box transformer vehicle electromagnetic compatibility evaluation method and system, and relates to the technical field of electrical engineering. Comprises: establishing a system coupling model based on an electromagnetic interference propagation path; adopting a stratified analysis method to determine the electromagnetic compatibility characteristic of the key equipment; establishing a multi-domain margin evaluation system including EME level, response characteristics and effect performance; analyzing and determining an equipment sensitive threshold value through an energy accumulation effect; and evaluating the electromagnetic compatibility safety margin according to the lowest use requirement of the system. According to the method, a system-level E3 margin model is established based on fault tree analysis, concepts and connotations of margins are accurately defined, a target object is effectively recognized in complex equipment and subsystems by establishing a margin logic relation between the equipment and the system, the problem of system-level marginal evaluation is solved, three evaluation methods of an EME domain, a response domain and an effect domain are provided, and the evaluation efficiency of the system-level marginal evaluation is improved. The problem that the margin cannot be calculated when the input or response signal level is unknown is solved.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering technology, and in particular to an electromagnetic compatibility evaluation method and system for a compact box-type transformer vehicle. Background Art

[0002] In recent years, with the rapid development of large electronic equipment and complex systems, electromagnetic compatibility assessment has become a key issue, especially for systems that integrate multiple devices such as compact box-type transformers. Due to their compact spatial layout and high equipment integration, the requirements for electromagnetic compatibility are more stringent. In this context, electromagnetic compatibility assessment technology has continued to develop, covering multiple links such as EME level analysis, response characteristic testing, and effect evaluation. In addition, margin assessment and safety analysis have become important tools for measuring the electromagnetic compatibility of systems. The system-level margin evaluation method can comprehensively consider multiple aspects such as electromagnetic interference propagation, equipment response, and performance impact.

[0003] Although the current electromagnetic compatibility assessment technology has made significant progress, there are still some key shortcomings: First, in terms of system-level margin assessment, existing methods mainly focus on test methods and equipment levels or key circuits, which are difficult to effectively deal with the complex electromagnetic energy coupling relationship in large and complex systems such as ships and aircraft; second, the verification methods for various types of EME vary greatly, and there is a lack of unified evaluation standards, resulting in unsatisfactory system-level margin assessment results; in addition, how to determine and select key functions or circuits, and how to evaluate system-level margins are still difficult problems. Existing evaluation methods often lack comprehensiveness and systematicity, and it is difficult to effectively guide the optimization design of system electromagnetic compatibility.

[0004] In response to these problems, the present invention proposes an electromagnetic compatibility evaluation method for compact box-type transformers. First, by establishing a system-level E3 margin model based on fault tree analysis, the system functions are decomposed into device functions, effectively simplifying the complexity; then, by establishing a multi-domain margin evaluation system including EME levels, response characteristics and effect performance, combined with energy accumulation effect analysis to determine the device sensitivity threshold, a comprehensive evaluation of the system's electromagnetic compatibility is achieved. The present invention closely combines the system coupling characteristics with the evaluation process, realizes the comprehensive optimization and continuous improvement of the electromagnetic compatibility evaluation, and provides important support for the electromagnetic compatibility design of complex systems. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to establish a system-level electromagnetic compatibility evaluation method for large and complex systems such as compact box-type vehicles, so as to solve the problems in the prior art such as complex electromagnetic energy coupling relationships, inconsistent verification methods, difficulty in identifying key functions, and limited margin calculation.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In the first aspect, an embodiment of the present invention provides an electromagnetic compatibility evaluation method for a compact box-type transformer vehicle, which includes establishing a system coupling model based on the electromagnetic interference propagation path; using a hierarchical analysis method to determine the electromagnetic compatibility characteristics of key equipment; establishing a multi-domain margin evaluation system including EME levels, response characteristics and effect performance; determining the equipment sensitivity threshold through energy accumulation effect analysis; and evaluating the electromagnetic compatibility safety margin according to the system's minimum usage requirements.

[0009] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type transformer vehicle of the present invention, the process of establishing the system coupling model includes:

[0010] Establish system coupling propagation paths and classify and analyze the transmission channels of electromagnetic interference within the system;

[0011] Collect the coupling port parameters of key system equipment and determine the electromagnetic interference characteristics of the coupling port;

[0012] Construct an electromagnetic energy transfer model of the coupling port and analyze the energy transmission characteristics between devices;

[0013] According to the electromagnetic energy coupling relationship, a system-level electromagnetic interference propagation analysis model is established.

[0014] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type vehicle according to the present invention, the multi-domain margin evaluation includes:

[0015] The electromagnetic characteristics of the coupling port are analyzed using the EME domain level evaluation method;

[0016] The electromagnetic energy transfer characteristics of the equipment are measured using the response domain characteristic evaluation method;

[0017] Evaluate equipment performance indicators through effect domain performance evaluation methods;

[0018] Establish a multi-domain collaborative evaluation mechanism to achieve comprehensive analysis of system electromagnetic compatibility.

[0019] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type transformer vehicle of the present invention, the EME domain level evaluation method includes:

[0020] Collect electromagnetic characteristic parameters of the coupling ports of key system equipment;

[0021] The electromagnetic interference margin of the coupling port is analyzed using a graded evaluation method;

[0022] Establish the magnetic susceptibility threshold model of the coupling port and determine the critical response characteristics;

[0023] Combined with the system usage requirements, evaluate the safety margin of the equipment in the expected electromagnetic environment.

[0024] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type vehicle of the present invention, the response domain characteristic evaluation method includes:

[0025] Establish an analysis model of electromagnetic energy transfer characteristics and determine the energy transmission path;

[0026] Analyze the correlation mechanism between equipment response characteristics and electromagnetic interference, and establish a characteristic parameter model;

[0027] Evaluate the impact of electromagnetic energy accumulation effect on equipment performance;

[0028] Determine the electromagnetic compatibility performance evaluation indicators of the equipment based on the minimum usage requirements of the system.

[0029] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type vehicle of the present invention, the specific steps of the EME domain level evaluation include:

[0030] A frequency domain analysis model is established to calculate the transfer relationship between the radiated electric field at the receiving antenna and the antenna output voltage:

[0031]

[0032] in, Output voltage for antenna The power spectral density of is the time domain signal of the radiated electric field at the antenna The power spectral density of is the transfer function;

[0033] According to the received power calculation formula:

[0034]

[0035] Where f0 is the receiving frequency in Hz, B is the receiving bandwidth, The transmitting frequency is f t Analyze the energy accumulation effect at the receiving frequency f0 in Hz;

[0036] By setting the maximum allowed input power threshold:

[0037]

[0038] in, is the electric power spectrum density. When the receiving frequency is f0 and the level is the critical magnetic susceptibility threshold, the radiation field is Field time domain signal of the same wave. is a frequency function, and its function form is the same as Same, but different in magnitude;

[0039] The relationship between the received power and the magnetic susceptibility threshold is established based on the frequency correlation coefficient:

[0040]

[0041] Used to evaluate the electromagnetic sensitivity characteristics of equipment; when the receiver input power Reach the maximum allowable input power When the receiving device is judged to be in a sensitive state, the critical margin value is determined.

[0042] As a preferred solution of the electromagnetic compatibility evaluation method for a compact box-type vehicle of the present invention, the specific implementation of the response domain characteristic evaluation includes:

[0043] Establish the relationship between the radiation field and the antenna output. For a transmission frequency of f t The radiation field of the antenna is calculated using the power spectrum density of the antenna output voltage. Radiated electric field power spectrum density and transfer function Establish frequency domain relationship model;

[0044] To determine sensitivity:

[0045]

[0046] According to the characteristics of periodic electromagnetic interference signals:

[0047]

[0048] Calculate the transmission frequency f t , the margin value at the receiving frequency f0;

[0049] Evaluate the safety margin and determine the maximum allowable response threshold through the sensitivity characteristic curve of equipment performance indicators and electromagnetic radiation levels;

[0050] Establish the correspondence between performance parameters and electromagnetic radiation levels, and complete the margin assessment in combination with the minimum usage requirements.

[0051] In a second aspect, an embodiment of the present invention provides an electromagnetic compatibility evaluation system for a compact box-type transformer vehicle, which includes an EME evaluation and analysis module, a response characteristic analysis module, and an effect evaluation and analysis module;

[0052] The EME evaluation and analysis module is used to collect coupling port electromagnetic parameters, equipment susceptibility data, electromagnetic environment characteristic data, and interference impact data to establish an EME domain evaluation model;

[0053] The response characteristic analysis module is used to analyze the electromagnetic energy transfer characteristics of the equipment based on EME assessment and to evaluate the response domain margin;

[0054] The effect evaluation and analysis module is used to monitor the electromagnetic compatibility evaluation process, establish an effect domain evaluation system through performance parameters, and regularly update and optimize the electromagnetic compatibility evaluation process.

[0055] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program instructions are executed by the processor, the steps of the electromagnetic compatibility evaluation method for a compact box-type vehicle as described in the first aspect of the present invention are implemented.

[0056] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program instructions are executed by a processor, the steps of the electromagnetic compatibility evaluation method for a compact box-type vehicle as described in the first aspect of the present invention are implemented.

[0057] The beneficial effects of the present invention are as follows: the electromagnetic compatibility evaluation method for a compact box-type transformer provided by the present invention establishes a system-level E3 margin model based on fault tree analysis, accurately defines the concept and connotation of margin, and is more in line with the reliability requirements of system design than the traditional "safety margin", thereby improving the operating safety of the system in an electromagnetic environment; by establishing a logical relationship between the margin of equipment and the system, the target object is effectively identified in complex equipment and subsystems, the system-level margin evaluation problem is solved, and the efficiency-cost ratio of the evaluation is significantly improved; based on the basic path and process of electromagnetic radiation, three evaluation methods of EME domain, response domain and effect domain are proposed, which solves the problem that the margin cannot be calculated when the input or response signal level is unknown, and the effectiveness and reliability of the method are verified by experiments; according to the specific conditions of different systems, a complete evaluation system including minimum cut set solution, test parameter determination and evaluation method selection is established, which provides a refinable technical solution for the evaluation of specific EME elements such as electromagnetic pulses, lightning, etc., and the present invention achieves more significant effects in terms of evaluation accuracy, method applicability and implementation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0059] Figure 1 The flowchart of the electromagnetic compatibility evaluation method and system for compact box-type transformer vehicles;

[0060] Figure 2 The connection principle diagram and configuration block diagram of the platform broadband receiving system verification test for the electromagnetic compatibility evaluation method and system of compact box-type transformer vehicle; DETAILED DESCRIPTION

[0061] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0062] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0063] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0064] Example 1

[0065] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides an electromagnetic compatibility evaluation method for a compact box-type transformer vehicle, comprising:

[0066] S1, establish a system coupling model based on the electromagnetic interference propagation path;

[0067] In the embodiment of the present application, the process of establishing the system coupling model includes:

[0068] Establish system coupling propagation paths and classify and analyze the transmission channels of electromagnetic interference within the system;

[0069] Collect the coupling port parameters of key system equipment and determine the electromagnetic interference characteristics of the coupling port;

[0070] Construct an electromagnetic energy transfer model of the coupling port and analyze the energy transmission characteristics between devices;

[0071] According to the electromagnetic energy coupling relationship, a system-level electromagnetic interference propagation analysis model is established.

[0072] In an optional embodiment, the EME applicable to the margin mainly includes external radio frequency (RF) EME, lightning, electromagnetic pulse (EMP), static electricity and high power microwave (HPM), etc. Electromagnetic energy enters the device through multiple coupling channels such as space radiation, cable conduction or shell conduction, forming multiple coupling ports.

[0073] In an alternative embodiment, the margin of the device is the minimum margin on all coupled ports and can be expressed as:

[0074]

[0075] In the formula, is the jth coupled port margin of a device or subsystem, and the qth minimum cut set of the pth minimum cut set of the device or subsystem p The jth coupled port corresponding to the element, m is the total electromagnetic energy coupled port number of the device. The margin is a function of frequency, which means that the margin at different frequencies may have different coupled ports.

[0076] S2, using the hierarchical analysis method to determine the electromagnetic compatibility characteristics of key equipment;

[0077] In an optional embodiment, the device will respond to the input electromagnetic energy, which may cause interference or damage. According to the process of EME on the device, the relevant parameters can be divided into three domains: the EME parameter domain describing the device coupling port, the response parameter domain describing the device coupling electromagnetic energy, and the effect parameter domain describing the device behavior. Therefore, the margin of the device or subsystem can be evaluated separately or jointly in the three parameter domains.

[0078] S3, establish a multi-domain margin evaluation system including EME level, response characteristics and effect performance;

[0079] In an embodiment of the present application, the multi-domain margin evaluation includes:

[0080] The electromagnetic characteristics of the coupling port are analyzed using the EME domain level evaluation method;

[0081] The electromagnetic energy transfer characteristics of the equipment are measured using the response domain characteristic evaluation method;

[0082] Evaluate equipment performance indicators through effect domain performance evaluation methods;

[0083] Establish a multi-domain collaborative evaluation mechanism to achieve comprehensive analysis of system electromagnetic compatibility.

[0084] In an embodiment of the present application, the EME domain level evaluation method includes:

[0085] Collect electromagnetic characteristic parameters of the coupling ports of key system equipment;

[0086] The electromagnetic interference margin of the coupling port is analyzed using a graded evaluation method;

[0087] Establish the magnetic susceptibility threshold model of the coupling port and determine the critical response characteristics;

[0088] Combined with the system usage requirements, evaluate the safety margin of the equipment in the expected electromagnetic environment.

[0089] In an embodiment of the present application, the response domain characteristic evaluation method includes:

[0090] Establish an analysis model of electromagnetic energy transfer characteristics and determine the energy transmission path;

[0091] Analyze the correlation mechanism between equipment response characteristics and electromagnetic interference, and establish a characteristic parameter model;

[0092] Evaluate the impact of electromagnetic energy accumulation effect on equipment performance;

[0093] Determine the electromagnetic compatibility performance evaluation indicators of the equipment based on the minimum usage requirements of the system.

[0094] In an optional embodiment, according to the definition of margin, the evaluation of all devices and subsystems can be completed based on the EME domain. When applying electromagnetic interference to the device coupling port and measuring its magnetic susceptibility threshold port, the test evaluation is performed using EME domain parameters. The margin is calculated for each coupling port of the device in the expected EME:

[0095] M p,qp-j =S p,qp-j -E' p,qp-j

[0096] Where, E' p,qp-j is the EME level on the jth coupling port of a key device or subsystem, corresponding to the qth minimum cut set of the pth system. p Elements; S p,qp-j is the magnetic susceptibility threshold of the jth coupling port of the device. E' p,qp-j and S p,qp-j They are all functions of frequency.

[0097] EME level E' on each port of each device p,qp-j The EMEs faced by the entire system include:

[0098] E' p,qp-j (f)=E(f)+T p,qp-j (f)

[0099] Where, T p,qp-j is the coupling function of the jth coupling port of this device, indicating the coupling capability.

[0100] It should be noted that typical evaluation methods include drug sensitivity threshold measurement method, full level test method, drug sensitivity characteristic approximation method, etc. The magnetic susceptibility threshold measurement method is to apply interference to the coupling port of the device or subsystem to observe whether there is a sensitive phenomenon, thereby determining the magnetic susceptibility threshold, and then compare the threshold with the actual or expected EME of the device or subsystem to obtain the electromagnetic margin value. The full level test method is to apply the full threat level signal at the device coupling port according to the margin to monitor whether the equipment is working properly. The sensitivity characteristic approximation method uses the known electromagnetic radiation level as the sensitivity threshold for evaluation.

[0101] S4, determine the device sensitivity threshold through energy accumulation effect analysis;

[0102] In an optional embodiment, when using EME domain parameters for evaluation, it is necessary to measure the magnetic susceptibility threshold and apply an interference signal outside the specified EME level. However, some devices may be potentially harmed after being subjected to a strong EME level, or even their performance cannot be restored after being destroyed by electromagnetic energy. Therefore, it is not suitable for applying strong electromagnetic interference. Response domain parameters can be used for evaluation. In the response evaluation of the RF receiving channel, electromagnetic radiation can affect the device through energy accumulation. For example, an excessively high power signal can cause the receiver signal-to-noise ratio (SNR) to decrease, the receiver performance to degrade, or even the receiver circuit to burn out. In this case, the response parameters can be used for evaluation.

[0103] It should be noted that the frequency domain analysis method is used. When the transmission frequency is ft, the relationship between the radiated electric field at the receiving antenna and the antenna output voltage is:

[0104]

[0105] in, Output voltage for antenna The power spectral density of is the time domain signal of the radiated electric field at the antenna The power spectral density of is the transfer function;

[0106] According to the received power calculation formula:

[0107]

[0108] Where f0 is the receiving frequency in Hz, B is the receiving bandwidth, The transmitting frequency is f t Analyze the energy accumulation effect at the receiving frequency f0 in Hz;

[0109] For a given receiving frequency f0 and radiation field, when the field strength at the receiving antenna is high enough to cause the received power to reach the maximum allowed input power, the receiving device is judged to be sensitive. Indicates the maximum allowable input power, which can be

[0110] in, is the electric power spectrum density. When the receiving frequency is f0 and the level is the critical magnetic susceptibility threshold, the radiation field is The field time domain signal of the same wave, is a frequency function, and its function form is the same as Same, but different in magnitude;

[0111] For a given receiving device, the ratio of these two functions is related to the receiving frequency.

[0112]

[0113] The relationship between the received power and the magnetic susceptibility threshold is established based on the frequency correlation coefficient:

[0114]

[0115] Used to evaluate the electromagnetic sensitivity characteristics of equipment; when the receiver input power Reach the maximum allowable input power When the receiving device is judged to be in a sensitive state, the critical margin value is determined.

[0116] It should also be noted that when the transmitter operates at a given waveform frequency f t When, except f t According to the standard, when the receiving frequency is f0 and the transmitting frequency is f t The field strength threshold when the receiving device is at the critical magnetic susceptibility under the radiation field of

[0117]

[0118] Calculate the transmission frequency f t , the margin value at the receiving frequency f0;

[0119] Among them, M(f t ,f0) is the transmitting frequency f t , receiving device margin when the receiving frequency is f0; The receiving device is the critical magnetic susceptibility and the transmitting frequency is f t , the field strength magnetic susceptibility threshold when the receiving frequency is f0; The transmitting frequency is f t The field strength at the antenna when .

[0120] It should be noted that electromagnetic interference affects equipment through energy accumulation and usually has a periodic signal. The intensity of the transmission frequency of the periodic signal on the power spectrum density function is the average value of the power amplitude of the frequency component.

[0121] in, When f = f0, it is equal to Its physical meaning is that the receiving device has a critical magnetic susceptibility and the transmitting frequency is f when the receiving frequency is f0. t The power spectrum density value of the electric field time domain signal at; To replace the antenna at the transmitting frequency f t The power spectral density value of the electric field time domain signal at .

[0122] Therefore, the received power can be and the maximum allowable power To evaluate whether electromagnetic interference affects the equipment through energy accumulation.

[0123] S5, evaluate the electromagnetic compatibility safety margin according to the system minimum use requirements;

[0124] In an optional embodiment, when using effect domain parameters for test evaluation, an initial safety margin must be calculated based on the performance indicators of the equipment or subsystem.

[0125] The required electromagnetic energy is then applied to the equipment, and the tactical and technical indicators of the equipment or subsystem are monitored to obtain a combination of safety margin and minimum usage requirements.

[0126] It should be noted that the linear extrapolation method is the simplest evaluation method. However, this method has limitations and requires that the tactical technical indicators of the equipment or subsystem decrease linearly with the increase of coupled electromagnetic energy. The performance indicators of many equipment cannot meet this requirement, such as the radar false alarm rate or radio bit error rate, which is exponentially related to the interference signal level.

[0127] It should also be noted that the sensitivity characteristic curve between the equipment performance parameters and the electromagnetic radiation level can be measured and fitted in advance. Then the sensitivity threshold or the maximum allowable response threshold corresponding to the minimum use requirement can be obtained. The evaluation is transferred from the effect domain to the EME domain or the response domain.

[0128] Furthermore, the present embodiment also provides an electromagnetic compatibility evaluation system for a compact box-type transformer vehicle, comprising an EME evaluation and analysis module, a response characteristic analysis module and an effect evaluation and analysis module;

[0129] The EME evaluation and analysis module is used to collect coupling port electromagnetic parameters, equipment susceptibility data, electromagnetic environment characteristic data, and interference impact data to establish an EME domain evaluation model;

[0130] The response characteristic analysis module is used to analyze the electromagnetic energy transfer characteristics of the equipment based on EME assessment and to evaluate the response domain margin;

[0131] The effect evaluation and analysis module is used to monitor the electromagnetic compatibility evaluation process, establish an effect domain evaluation system through performance parameters, and regularly update and optimize the electromagnetic compatibility evaluation process.

[0132] This embodiment also provides a computer device, which is applicable to the electromagnetic compatibility evaluation method of a compact box-type vehicle, and includes a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions to implement the electromagnetic compatibility evaluation method of a compact box-type vehicle as proposed in the above embodiment.

[0133] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0134] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the electromagnetic compatibility evaluation method for a compact box-type vehicle is implemented as proposed in the above embodiment.

[0135] In summary, the electromagnetic compatibility evaluation method for compact box-type transformer provided by the present invention establishes a system-level E3 margin model based on fault tree analysis, accurately defines the concept and connotation of margin, and is more in line with the reliability requirements of system design than the traditional "safety margin", thereby improving the operating safety of the system in an electromagnetic environment; by establishing a logical relationship between the margin of equipment and the system, the target object is effectively identified in complex equipment and subsystems, the system-level margin evaluation problem is solved, and the efficiency-cost ratio of the evaluation is significantly improved; based on the basic path and process of electromagnetic radiation, three evaluation methods of EME domain, response domain and effect domain are proposed, which solves the problem that the margin cannot be calculated when the input or response signal level is unknown, and the effectiveness and reliability of the method are verified by experiments; according to the specific conditions of different systems, a complete evaluation system including minimum cut set solution, test parameter determination and evaluation method selection is established, which provides a refinable technical solution for the evaluation of specific EME elements such as electromagnetic pulses and lightning, and the present invention has achieved more significant results in terms of evaluation accuracy, method applicability and implementation efficiency.

[0136] Example 2

[0137] This is the second embodiment of the present invention. This embodiment provides an electromagnetic compatibility evaluation method for a compact box-type transformer vehicle. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0138] In order to verify the effectiveness of the method of the present invention, a certain type of 35kV compact box-type transformer was selected for electromagnetic compatibility evaluation experiment. The box-type transformer integrates multiple key equipment such as transformer, switch cabinet, control system, etc., with compact space layout and prominent electromagnetic interference problem.

[0139] First, an electromagnetic field scanner was used to perform a full-scale scan of the interior of the box-type transformer car to identify the main electromagnetic interference propagation paths, including the transformer radiation path, the switch cabinet conduction path, and the control system coupling path. The system coupling model was established using electromagnetic field analysis software to visualize the coupling relationship between the various devices. Seven key coupling points were identified through the fault tree analysis method, which were located around the transformer (CP1, CP2), at the switch cabinet interface (CP3, CP4), and the control system signal line (CP5, CP6, CP7).

[0140] The layered analysis method was used to test the electromagnetic compatibility characteristics of these key coupling points. Using EMI receivers and near-field probes, scanning measurements were performed in the 30MHz-1GHz frequency band to obtain the electromagnetic interference characteristic data of each coupling point. At the same time, the sensitivity threshold of each device was tested by the injection method, and a multi-domain evaluation system including EME level, response characteristics and effect performance was established.

[0141] In order to analyze the energy accumulation effect, electromagnetic interference signals of different intensities were applied at each key point to observe the response characteristics of the equipment. Through long-term monitoring, the sensitive threshold and critical response characteristics of each device were determined. Finally, according to the actual operation requirements, the minimum use requirements of the system were set to evaluate the electromagnetic compatibility safety margin. The traditional single-domain evaluation method and the multi-domain collaborative evaluation method of the present invention were used for comparative tests, and the results are as follows:

[0142]

[0143] The following conclusions can be drawn from comparative data analysis:

[0144] In terms of measurement error: the measurement error of the method of the present invention is significantly lower than that of the traditional method, and the average measurement error is reduced from 8.3% to 3.0%, an increase of 63.8%. This is mainly due to the introduction of the multi-domain collaborative evaluation mechanism, which can cross-validate and compensate for the measurement results from multiple dimensions.

[0145] Evaluation efficiency: The method of the present invention significantly shortens the evaluation time, with the average evaluation time reduced from 44 minutes to 27 minutes, improving the work efficiency by 38.6%. This is because the establishment of the system coupling model simplifies the evaluation process and avoids repeated measurements and redundant analysis.

[0146] Margin accuracy: The margin assessment accuracy of the method of the present invention is significantly better than that of the traditional method, with the average accuracy increased from 86.1% to 95.1%, an increase of 9 percentage points. This is due to the application of the energy accumulation effect analysis method, which makes the determination of the sensitive threshold more accurate.

[0147] Evaluation results of each coupling point: Among all the test points, the improvement effect of the control system power line CP5 was the most significant, and the measurement error was reduced by 66.7%, which shows that the method of the present invention has better adaptability to complex electromagnetic coupling paths. The evaluation results of strong electromagnetic field areas such as the transformer body CP1 and the switch cabinet incoming line CP3 also showed obvious advantages, proving that the method also has good reliability in high-intensity electromagnetic environments.

[0148] This embodiment fully demonstrates the superiority of the invention in the electromagnetic compatibility evaluation of compact box-type transformer vehicles, which not only improves the accuracy and efficiency of the evaluation, but also provides reliable technical support for the electromagnetic compatibility design of the equipment. In particular, it demonstrates significant technical advantages and practical value in the analysis of multi-device coupling in complex electromagnetic environments.

[0149] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating electromagnetic compatibility of a compact box-type transformer vehicle, characterized in that: include, Establish a system coupling model based on the electromagnetic interference propagation path; Use hierarchical analysis to determine the electromagnetic compatibility characteristics of key equipment; Establish a multi-domain margin evaluation system including EME level, response characteristics and effect performance; Determine the device sensitivity threshold through energy accumulation effect analysis; Evaluate the electromagnetic compatibility safety margin based on the system's minimum usage requirements.

2. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 1, characterized in that: The process of establishing the system coupling model includes: Establish system coupling propagation paths and classify and analyze the transmission channels of electromagnetic interference within the system; Collect the coupling port parameters of key system equipment and determine the electromagnetic interference characteristics of the coupling port; Construct an electromagnetic energy transfer model of the coupling port and analyze the energy transmission characteristics between devices; According to the electromagnetic energy coupling relationship, a system-level electromagnetic interference propagation analysis model is established.

3. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 2, characterized in that: The multi-domain margin evaluation includes: The electromagnetic characteristics of the coupling port are analyzed using the EME domain level evaluation method; The electromagnetic energy transfer characteristics of the equipment are measured using the response domain characteristic evaluation method; Evaluate equipment performance indicators through effect domain performance evaluation methods; Establish a multi-domain collaborative evaluation mechanism to achieve comprehensive analysis of system electromagnetic compatibility.

4. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 3 is characterized in that: The EME domain level evaluation method comprises: Collect electromagnetic characteristic parameters of the coupling ports of key system equipment; The electromagnetic interference margin of the coupling port is analyzed using a graded evaluation method; Establish the magnetic susceptibility threshold model of the coupling port and determine the critical response characteristics; Combined with the system usage requirements, evaluate the safety margin of the equipment in the expected electromagnetic environment.

5. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 4 is characterized in that: The response domain characteristic evaluation method comprises: Establish an analysis model of electromagnetic energy transfer characteristics and determine the energy transmission path; Analyze the correlation mechanism between equipment response characteristics and electromagnetic interference, and establish a characteristic parameter model; Evaluate the impact of electromagnetic energy accumulation effect on equipment performance; Determine the electromagnetic compatibility performance evaluation indicators of the equipment based on the minimum usage requirements of the system.

6. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 5 is characterized in that: The specific steps of the EME domain level evaluation include: A frequency domain analysis model is established to calculate the transfer relationship between the radiated electric field at the receiving antenna and the antenna output voltage: in, Output voltage for antenna The power spectral density of is the time domain signal of the radiated electric field at the antenna The power spectral density of is the transfer function; According to the received power calculation formula: Where f0 is the receiving frequency in Hz, B is the receiving bandwidth, The transmitting frequency is f t Analyze the energy accumulation effect at the receiving frequency f0 in Hz; By setting the maximum allowed input power threshold: in, is the electric power spectrum density. When the receiving frequency is f0 and the level is the critical magnetic susceptibility threshold, the radiation field is The field time domain signal of the same wave, is a frequency function, and its function form is the same as Same, but different in magnitude; The relationship between the received power and the magnetic susceptibility threshold is established based on the frequency correlation coefficient: Used to evaluate the electromagnetic sensitivity characteristics of equipment; when the receiver input power Reach the maximum allowable input power When the receiving device is judged to be in a sensitive state, the critical margin value is determined.

7. The electromagnetic compatibility evaluation method for a compact box-type vehicle as claimed in claim 6 is characterized in that: The specific implementation of the response domain characteristic evaluation includes: Establish the relationship between the radiation field and the antenna output. For a transmission frequency of f t The radiation field of the antenna is calculated using the power spectrum density of the antenna output voltage. Radiated electric field power spectrum density and transfer function Establish frequency domain relationship model; To determine sensitivity: According to the characteristics of periodic electromagnetic interference signals: Calculate the transmission frequency f t , the margin value at the receiving frequency f0; Evaluate the safety margin and determine the maximum allowable response threshold through the sensitivity characteristic curve of equipment performance indicators and electromagnetic radiation levels; Establish the correspondence between performance parameters and electromagnetic radiation levels, and complete the margin assessment in combination with the minimum usage requirements.

8. An electromagnetic compatibility evaluation system for a compact box-type vehicle, based on the electromagnetic compatibility evaluation method for a compact box-type vehicle according to any one of claims 1 to 7, characterized in that: It also includes, EME assessment and analysis module, response characteristic analysis module and effect evaluation and analysis module; The EME evaluation and analysis module is used to collect coupling port electromagnetic parameters, equipment susceptibility data, electromagnetic environment characteristic data, and interference impact data to establish an EME domain evaluation model; The response characteristic analysis module is used to analyze the electromagnetic energy transfer characteristics of the equipment based on EME assessment and to evaluate the response domain margin; The effect evaluation and analysis module is used to monitor the electromagnetic compatibility evaluation process, establish an effect domain evaluation system through performance parameters, and regularly update and optimize the electromagnetic compatibility evaluation process.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the electromagnetic compatibility evaluation method for a compact box-type vehicle according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the electromagnetic compatibility evaluation method for a compact box-type vehicle according to any one of claims 1 to 7 are implemented.

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