Method, device and equipment for analyzing power supply quality of alternating-current variable-frequency power source and medium
By comparing the output characteristic parameters of the AC variable frequency power supply with the dynamically adjusted preset standard parameters, abnormal power supply parameters are identified, and power supply quality is evaluated. This solves the problem of low accuracy in power supply quality evaluation of AC variable frequency power supplies and achieves efficient evaluation and safe power supply in complex environments.
Patent Information
- Application Number
- CN202511016544.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-11-14
AI Technical Summary
The accuracy of power supply quality assessment in existing AC frequency converters is low, making it difficult to detect and prevent problems during operation, especially when the total harmonic distortion rate of voltage exceeds the standard during the startup of high-power equipment on ships.
By comparing the output characteristic parameters of the AC variable frequency power supply with the dynamically adjusted preset standard parameters, abnormal power supply parameters are determined, and the power supply quality is evaluated based on the abnormal power supply parameters. This includes collecting the effective value of voltage, the effective value of current, voltage frequency, and total voltage harmonic distortion rate. The basic standard parameters are dynamically adjusted in conjunction with the slope of current change, and the parameters are assigned weights and the comprehensive impact score is calculated using a weighted average.
It improves the accuracy of AC inverter power supply quality assessment, enabling timely detection of problems under complex load environments and power supply changes, preventing equipment damage, and ensuring power supply safety.
Smart Images
Figure CN120955607A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power analysis technology, specifically to a method, apparatus, equipment, and medium for analyzing the power supply quality of an AC variable frequency power supply. Background Technology
[0002] With increasingly stringent environmental regulations, to reduce air pollution and carbon emissions, ships at port terminals must shut down their diesel generators after berthing and switch to shore power. Domestic AC power is three-phase 380V at 50Hz, while international shipping uses three-phase 440V at 60Hz. To meet these requirements, shore power must be supplied via an AC frequency converter to transform the 50Hz 380V to 60Hz 440V. Unstable voltage output from the AC frequency converter, along with high harmonic content, can cause malfunctions in ship electrical equipment, and in severe cases, even damage it. However, current AC power quality analysis is limited to harmonic analysis. When high-power equipment is started on a ship, the total harmonic distortion (THD) can exceed the standard parameter of 5%. Therefore, directly using the THD to assess AC power quality is inaccurate, impractical, and difficult to detect and prevent problems during operation. Summary of the Invention
[0003] The purpose of this invention is to overcome the deficiencies in the prior art and provide an analytical method, apparatus, equipment, and medium for improving the accuracy of AC variable frequency power supply quality assessment, which can help identify and prevent problems during operation.
[0004] To achieve the above objectives, the first aspect of this invention provides a method for analyzing the power supply quality of an AC variable frequency power supply, comprising: The output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters are obtained. The preset dynamic standard parameters are dynamically adjusted according to the changes in the output current of the AC variable frequency power supply. The output characteristic parameters are compared with the preset dynamic standard parameters to determine abnormal power supply parameters; The power supply quality assessment result of the AC inverter power supply is determined based on the abnormal power supply parameters.
[0005] Furthermore, obtain the output characteristic parameters of the AC frequency converter, including: The effective voltage value, effective current value, voltage frequency, total harmonic distortion of voltage, total harmonic distortion of current, voltage crest factor, and current crest factor of current are collected by a power quality monitor and used as the output characteristic parameters of the AC variable frequency power supply.
[0006] Furthermore, obtaining preset dynamic standard parameters corresponding to the output characteristic parameters includes: Obtain the preset basic standard parameters and the effective value of the current output by the AC frequency converter and the current change slope; The preset dynamic standard parameters are obtained by dynamically adjusting the basic standard parameters based on the effective value of the current and the slope of the current change.
[0007] Furthermore, the output characteristic parameters are compared with the preset dynamic standard parameters to determine abnormal power supply parameters, including: Calculate the fluctuation range of the output characteristic parameter relative to the preset dynamic standard parameter; Output characteristic parameters whose fluctuation amplitude exceeds a preset fluctuation threshold are identified as abnormal power supply parameters.
[0008] Furthermore, the power supply quality assessment result of the AC inverter power supply is determined based on the abnormal power supply parameters, including: Based on the degree of impact of the abnormal power supply parameters on power quality, each abnormal power supply parameter is assigned a corresponding weight, and the comprehensive impact score of the abnormal power supply parameters is calculated by weighting. The power supply quality assessment result of the AC inverter power supply is determined based on the comprehensive impact score.
[0009] Furthermore, the preset fluctuation threshold includes an alarm threshold; The method further includes: When the fluctuation amplitude exceeds the alarm threshold, an alarm signal is generated to provide a notification.
[0010] Furthermore, the preset fluctuation threshold includes a shutdown threshold; The method further includes: When the fluctuation amplitude exceeds the shutdown threshold, a shutdown signal is output after a delay to switch the output of the AC inverter power supply.
[0011] A second aspect of the present invention provides an analysis device for the power supply quality of an AC inverter power supply, comprising: The acquisition module is used to acquire the output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters. The preset dynamic standard parameters are dynamically adjusted according to the changes in the output current of the AC variable frequency power supply. An anomaly identification module is used to compare the output characteristic parameters with the preset dynamic standard parameters to determine abnormal power supply parameters; An evaluation module is used to determine the power supply quality evaluation result of the AC frequency converter based on the abnormal power supply parameters.
[0012] Furthermore, when acquiring the output characteristic parameters of the AC frequency converter, the acquisition module specifically uses a power quality monitor to acquire the effective voltage value, effective current value, voltage frequency, total harmonic distortion of voltage, total harmonic distortion of current, voltage crest factor, and current crest factor of the AC frequency converter output as the output characteristic parameters.
[0013] Furthermore, when acquiring the preset dynamic standard parameters corresponding to the output characteristic parameters, the acquisition module is specifically used to acquire the preset basic standard parameters and the effective value of the current output by the AC frequency converter and the current change slope; and dynamically adjust the basic standard parameters according to the effective value of the current and the current change slope to obtain the preset dynamic standard parameters.
[0014] Furthermore, when the anomaly identification module compares the output characteristic parameters with the preset dynamic standard parameters to determine abnormal power supply parameters, it specifically calculates the fluctuation amplitude of the output characteristic parameters relative to the preset dynamic standard parameters; and determines the output characteristic parameters whose fluctuation amplitude exceeds a preset fluctuation threshold as the abnormal power supply parameters.
[0015] Furthermore, when determining the power supply quality assessment result of the AC inverter power supply based on the abnormal power supply parameters, the assessment module specifically assigns a corresponding weight to each abnormal power supply parameter according to the degree of influence of the abnormal power supply parameters on the power supply quality, and calculates the comprehensive impact score of the abnormal power supply parameters by weighting; and determines the power supply quality assessment result of the AC inverter power supply based on the comprehensive impact score.
[0016] Furthermore, the preset fluctuation threshold includes an alarm threshold; The device also includes an alarm module, which is used to generate an alarm signal to provide a prompt when the fluctuation amplitude exceeds the alarm threshold.
[0017] Furthermore, the preset fluctuation threshold includes a shutdown threshold; The device also includes a shutdown module, which is used to output a shutdown signal after a delay to switch the output of the AC frequency converter when the fluctuation amplitude exceeds the shutdown threshold.
[0018] A third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the method of any of the first aspects.
[0019] A fourth aspect of the present invention provides a computer-readable storage medium having program instructions stored thereon, which, when executed, implement the method of any one of the first aspects.
[0020] The advantages and beneficial effects of this invention are as follows: by collecting and analyzing the key characteristic parameters of the AC variable frequency power supply output, and combining them with preset dynamic standard parameters that are dynamically adjusted according to the current changes of the AC variable frequency power supply output, abnormal power supply parameters are determined, and the real-time status of the power supply system is comprehensively judged. This can effectively cope with complex load environments and power supply changes, and improve the accuracy of AC variable frequency power supply quality assessment. Attached Figure Description
[0021] Figure 1 This is a flowchart of the AC frequency converter power supply quality analysis method of the present invention; Figure 2 This is a schematic diagram of the structure of the AC frequency converter power supply quality analysis device of the present invention; Figure 3 This is a schematic diagram of the structure of the electronic device of the present invention. Detailed Implementation
[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0023] according to Figure 1 As shown, the method for analyzing the power supply quality of the AC inverter power supply of the present invention includes the following steps: S101. Obtain the output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters. The preset dynamic standard parameters are obtained by dynamically adjusting according to the changes in the output current of the AC variable frequency power supply.
[0024] S102. Compare the output characteristic parameters with the preset dynamic standard parameters to determine the abnormal power supply parameters.
[0025] S103. Determine the power supply quality assessment results of the AC frequency converter based on the abnormal power supply parameters.
[0026] Key characteristic parameters of the AC variable frequency power supply output can be acquired in real time using a sensor array installed at the power supply output terminal. For example, voltage sensors monitor the effective value of the output voltage, while current sensors capture the effective value of the output current. These devices are directly connected to the acquisition module and convert analog signals into digital signals via an analog-to-digital converter for subsequent processing.
[0027] Programmable logic controllers (PLCs) are used to program dynamic standard parameters based on the magnitude and slope of the current output from the AC inverter power supply. For example, a basic standard parameter is preset, and a corresponding correction coefficient is determined based on the current output current magnitude and slope of the AC inverter power supply. This correction coefficient is then used to dynamically adjust the basic standard parameter to obtain the preset dynamic standard parameter. This makes the evaluation standard more closely match the current load environment and power supply changes, thus enabling the system to handle complex load environments and power supply variations.
[0028] Abnormal power supply parameters can be identified by comparing the output characteristic parameters with preset dynamic standard parameters. For example, when the deviation of the output characteristic parameter from the preset dynamic standard parameter is higher than its corresponding fluctuation threshold, the output characteristic parameter can be identified as an abnormal power supply parameter. Then, based on the number of abnormal power supply parameters and the magnitude of the deviation, the power supply quality assessment result of the AC frequency converter can be determined.
[0029] This invention collects and analyzes key characteristic parameters of AC variable frequency power supply output, and combines preset dynamic standard parameters that are dynamically adjusted according to the current changes of AC variable frequency power supply output to determine abnormal power supply parameters. It comprehensively judges the real-time status of the power supply system, which can effectively cope with complex load environments and power supply changes, and improve the accuracy of AC variable frequency power supply quality assessment.
[0030] To ensure the comprehensiveness and accuracy of the AC variable frequency power supply quality assessment, a preferred embodiment of the present invention is to obtain the output characteristic parameters of the AC variable frequency power supply, including: using a power quality monitor to collect the effective voltage value, effective current value, voltage frequency, total harmonic distortion of voltage, total harmonic distortion of current, voltage crest coefficient, and current crest coefficient of the AC variable frequency power supply output as output characteristic parameters.
[0031] In order to accurately assess the power supply quality of AC inverter power supplies under complex load environments and power supply changes, a preferred embodiment of the present invention is to obtain preset dynamic standard parameters corresponding to the output characteristic parameters, including: obtaining preset basic standard parameters and the effective value of the current output by the AC inverter power supply and the current change slope; dynamically adjusting the basic standard parameters according to the effective value of the current and the current change slope to obtain the preset dynamic standard parameters.
[0032] To enhance the comprehensiveness and accuracy of AC variable frequency power supply quality assessment, a preferred embodiment of the present invention involves comparing output characteristic parameters with preset dynamic standard parameters to determine abnormal power supply parameters, including: calculating the fluctuation range of output characteristic parameters relative to preset dynamic standard parameters; and identifying output characteristic parameters whose fluctuation range exceeds a preset fluctuation threshold as abnormal power supply parameters.
[0033] To comprehensively evaluate the power supply quality of AC inverter power supplies and further improve the accuracy of AC inverter power supply quality assessment, a preferred embodiment of the present invention is to determine the power supply quality assessment result of the AC inverter power supply based on abnormal power supply parameters, including: assigning a corresponding weight to each abnormal power supply parameter according to the degree of influence of the abnormal power supply parameters on the power supply quality, and calculating the comprehensive impact score of the abnormal power supply parameters by weighting; and determining the power supply quality assessment result of the AC inverter power supply based on the comprehensive impact score.
[0034] Based on the degree of impact of different parameters on power supply quality, each parameter type is assigned a weight (e.g., voltage or current deviation weight 0.3, harmonic distortion weight 0.25, frequency deviation weight 0.2, crest coefficient deviation weight 0.25, summed to 1). Then, a weighted comprehensive score is calculated, assigning 1 point to "Slight," 3 points to "Moderate," and 5 points to "Severe" (higher scores indicate greater impact). The comprehensive score = Σ(severity score of a single parameter × corresponding weight). The final power supply quality level is determined based on the comprehensive score. For example: Excellent: comprehensive score < 1.5 (no severe anomalies, ≤1 minor anomaly); Good: 1.5 ≤ comprehensive score < 3 (no severe anomalies, ≤3 minor anomalies, no moderate anomalies); Satisfactory: 3 ≤ comprehensive score < 4.5 (≤5 minor anomalies, ≤2 moderate anomalies, no severe anomalies); Unsatisfactory: comprehensive score ≥ 4.5 (at least 1 severe anomaly exists, or >2 moderate anomalies).
[0035] To ensure uninterrupted power supply, promptly identify potential problems, and prevent escalation of faults, a preferred embodiment of this invention includes a preset fluctuation threshold, including an alarm threshold. The method further includes generating an alarm signal to alert the user when the fluctuation amplitude exceeds the alarm threshold.
[0036] In order to protect electrical equipment from damage and improve power supply safety, a preferred embodiment of the present invention is that the preset fluctuation threshold includes a shutdown threshold; the method further includes: when the fluctuation amplitude exceeds the shutdown threshold, a shutdown signal is output after a delay to switch the output of the AC frequency converter power supply.
[0037] like Figure 2 As shown, the AC inverter power supply quality analysis device 200 of the present invention includes: The acquisition module 201 is used to acquire the output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters. The preset dynamic standard parameters are dynamically adjusted according to the changes in the output current of the AC variable frequency power supply. The anomaly identification module 202 is used to compare the output characteristic parameters with preset dynamic standard parameters to determine abnormal power supply parameters; Evaluation module 203 is used to determine the power supply quality evaluation result of AC frequency converter based on abnormal power supply parameters.
[0038] Furthermore, when acquiring the output characteristic parameters of the AC frequency converter power supply, the acquisition module 201 specifically uses a power quality monitor to acquire the effective voltage value, effective current value, voltage frequency, total harmonic distortion of voltage, total harmonic distortion of current, voltage crest coefficient, and current crest coefficient of the AC frequency converter power supply as output characteristic parameters.
[0039] Furthermore, when acquiring the preset dynamic standard parameters corresponding to the output characteristic parameters, the acquisition module 201 is specifically used to acquire the preset basic standard parameters and the effective value of the current output by the AC frequency converter and the current change slope; and dynamically adjusts the basic standard parameters according to the effective value of the current and the current change slope to obtain the preset dynamic standard parameters.
[0040] Furthermore, when the anomaly identification module 202 compares the output characteristic parameters with the preset dynamic standard parameters to determine the abnormal power supply parameters, it specifically calculates the fluctuation amplitude of the output characteristic parameters relative to the preset dynamic standard parameters; and determines the output characteristic parameters whose fluctuation amplitude exceeds the preset fluctuation threshold as abnormal power supply parameters.
[0041] Furthermore, when determining the power supply quality assessment result of the AC inverter power supply based on the abnormal power supply parameters, the assessment module 203 is specifically used to assign a corresponding weight to each abnormal power supply parameter according to the degree of influence of the abnormal power supply parameters on the power supply quality, and to calculate the comprehensive impact score of the abnormal power supply parameters by weighting; and to determine the power supply quality assessment result of the AC inverter power supply based on the comprehensive impact score.
[0042] Furthermore, the preset fluctuation threshold includes an alarm threshold; the device also includes an alarm module 204, which is used to generate an alarm signal to provide a prompt when the fluctuation amplitude exceeds the alarm threshold.
[0043] Furthermore, the preset fluctuation threshold includes a shutdown threshold; the device also includes a shutdown module 205, which is used to output a shutdown signal after a delay to switch the output of the AC frequency converter when the fluctuation amplitude exceeds the shutdown threshold.
[0044] Figure 2 The AC inverter power supply quality analysis device shown can be used to implement the technical solution of the above method embodiment. Its implementation principle and technical effect are similar, and will not be described again here.
[0045] Figure 3The illustrated electronic device can execute the processing flow provided by the AC inverter power supply quality analysis method. The electronic device 300 includes: a memory 301, a processor 302, a computer program, and a communication interface 303. The computer program is stored in the memory 301 and configured to be executed by the processor 302 using the AC inverter power supply quality analysis method described above. In a particular embodiment, the memory 301 may be a non-volatile solid-state memory. In a particular embodiment, the memory 301 includes a read-only memory (ROM).
[0046] The present invention also provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the AC inverter power supply quality analysis method described in the above embodiments. The storage medium may be a non-volatile / non-transitory computer-readable storage medium.
[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A method for analyzing the power supply quality of an AC variable frequency power supply, characterized in that, include: The output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters are obtained. The preset dynamic standard parameters are dynamically adjusted according to the changes in the output current of the AC variable frequency power supply. The output characteristic parameters are compared with the preset dynamic standard parameters to determine abnormal power supply parameters; The power supply quality assessment result of the AC inverter power supply is determined based on the abnormal power supply parameters.
2. The method for analyzing the power supply quality of an AC variable frequency power supply according to claim 1, characterized in that, Obtain the output characteristic parameters of the AC variable frequency power supply, including: The effective voltage value, effective current value, voltage frequency, total harmonic distortion of voltage, total harmonic distortion of current, voltage crest factor, and current crest factor of current are collected by a power quality monitor and used as the output characteristic parameters of the AC variable frequency power supply.
3. The method for analyzing the power supply quality of an AC variable frequency power supply according to claim 1, characterized in that, Obtaining preset dynamic standard parameters corresponding to the output characteristic parameters includes: Obtain the preset basic standard parameters and the effective value of the current output by the AC frequency converter and the current change slope; The preset dynamic standard parameters are obtained by dynamically adjusting the basic standard parameters based on the effective value of the current and the slope of the current change.
4. The method for analyzing the power supply quality of AC variable frequency power supplies according to claim 1, characterized in that, The output characteristic parameters are compared with the preset dynamic standard parameters to determine abnormal power supply parameters, including: Calculate the fluctuation range of the output characteristic parameter relative to the preset dynamic standard parameter; Output characteristic parameters whose fluctuation amplitude exceeds a preset fluctuation threshold are identified as abnormal power supply parameters.
5. The method for analyzing the power supply quality of an AC variable frequency power supply according to claim 1, characterized in that, The power supply quality assessment result of the AC inverter power supply is determined based on the abnormal power supply parameters, including: Based on the degree of impact of the abnormal power supply parameters on power quality, each abnormal power supply parameter is assigned a corresponding weight, and the comprehensive impact score of the abnormal power supply parameters is calculated by weighting. The power supply quality assessment result of the AC inverter power supply is determined based on the comprehensive impact score.
6. The method for analyzing the power supply quality of an AC variable frequency power supply according to claim 4, characterized in that, The preset fluctuation threshold includes an alarm threshold; The method further includes: When the fluctuation amplitude exceeds the alarm threshold, an alarm signal is generated to provide a notification.
7. The method for analyzing the power supply quality of an AC variable frequency power supply according to claim 4, characterized in that, The preset fluctuation threshold includes a shutdown threshold; The method further includes: When the fluctuation amplitude exceeds the shutdown threshold, a shutdown signal is output after a delay to switch the output of the AC inverter power supply.
8. A device for analyzing the power supply quality of an AC variable frequency power supply, characterized in that, include: The acquisition module is used to acquire the output characteristic parameters of the AC variable frequency power supply and the preset dynamic standard parameters corresponding to the output characteristic parameters. The preset dynamic standard parameters are dynamically adjusted according to the changes in the output current of the AC variable frequency power supply. An anomaly identification module is used to compare the output characteristic parameters with the preset dynamic standard parameters to determine abnormal power supply parameters; An evaluation module is used to determine the power supply quality evaluation result of the AC frequency converter based on the abnormal power supply parameters.
9. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the method as described in any one of claims 1-7.
10. A computer-readable storage medium, characterized in that, It stores program instructions that, when executed, implement the method as described in any one of claims 1-7.