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CN-122017666-A - Short circuit identification method and device for terminal power utilization acquisition

CN122017666ACN 122017666 ACN122017666 ACN 122017666ACN-122017666-A

Abstract

The invention discloses a short circuit identification method and device for terminal electricity collection, the method comprises the steps of collecting current signals in a power supply loop in real time and converting the current signals into current waveform data of continuous cyclic waves, caching the current waveform data of continuous preset number of cyclic waves in parallel to form a multi-level cache queue, synchronously extracting waveform characteristic quantities of the continuous preset number of cyclic waves from the multi-level cache queue, wherein the waveform characteristic quantities comprise peak clipping characteristics used for describing current limiting characteristics and shoulder flattening characteristics used for describing current steady state characteristics, carrying out multi-period combination comparison on the waveform characteristic quantities of the continuous preset number of cyclic waves and a preset short circuit characteristic rule base, and judging whether short circuits occur or not based on consistency of the multi-period combination comparison results. Compared with the prior art, the method and the device realize the identification of the terminal short circuit which does not depend on a mechanical structure, has high precision and is low in false alarm by analyzing the multidimensional characteristics of the current waveform and carrying out multicycle combination comparison.

Inventors

  • SUN HAO
  • LI JIAWEI
  • PEI SHANYONG
  • WANG YUNTAO
  • Geng Jiangguo
  • YANG FAN
  • JIN JIE

Assignees

  • 安科瑞电气股份有限公司
  • 江苏安科瑞电器制造有限公司
  • 江苏安科瑞微电网研究院有限公司

Dates

Publication Date
20260512
Application Date
20251209

Claims (10)

  1. 1. A short circuit identification method for end electricity collection, comprising: Collecting current signals in a power supply loop in real time, and converting the current signals into current waveform data of continuous cycle waves; Parallel caching current waveform data of continuous preset number of cycles to form a multi-level cache queue; Synchronously extracting waveform characteristic quantities of continuous preset number of cycles from the multi-level cache queue, wherein the waveform characteristic quantities comprise peak clipping characteristics for describing current limiting characteristics and shoulder flattening characteristics for describing current steady-state characteristics; carrying out multi-period combination comparison on the waveform characteristic quantity and a preset short circuit characteristic rule base; and judging whether a short circuit occurs or not based on the consistency of the multi-period combined comparison result.
  2. 2. The short circuit identification method for terminal power utilization acquisition according to claim 1, wherein the parallel buffering of current waveform data of a continuous preset number of cycles specifically comprises: Setting a preset number of cyclically used first-in first-out buffer areas; Storing the latest cycle data acquired in real time into the current buffer area, and sequentially moving the data in each buffer area in the previous period backwards to form the multi-level buffer queue.
  3. 3. The method for short circuit identification for end use electrical collection of claim 1, wherein extracting the waveform feature quantity comprises: Identifying amplitude limiting sections exceeding a preset current threshold in a current waveform, counting the number of the amplitude limiting sections as peak clipping waveform, and counting the number of continuous sampling points of the amplitude limiting sections to obtain a peak clipping continuous period; and identifying a steady-state segment in a preset current range in the current waveform, counting the steady-state segment as the number of the shoulder waves, and counting the number of continuous sampling points of the steady-state segment to obtain the shoulder wave period.
  4. 4. A short circuit identification method for end use electrical collection according to claim 1, wherein prior to said extracting waveform feature quantity, the method further comprises: Calculating the similarity between the current cycle current waveform data and a pre-stored typical short circuit waveform; if the similarity is lower than a preset threshold, judging that the current waveform is a normal load waveform, and terminating the subsequent flow; otherwise, triggering and executing the step of extracting the waveform characteristic quantity.
  5. 5. The method for identifying a short circuit for power harvesting at a terminal according to claim 1, wherein the determining whether the short circuit occurs specifically comprises: If the waveform characteristic quantity of the current cycle is matched with the preset short circuit characteristic rule base, generating a pre-alarm state; Consistency comparison is carried out on the pre-alarm state generated by the subsequent cycle and the pre-alarm state of the previous cycle; and if the pre-alarm states of the continuous preset number of cycles all indicate short circuits, confirming that the short circuits occur.
  6. 6. The method for identifying a short circuit for terminal power utilization collection according to claim 1, wherein establishing the preset short circuit characteristic rule base specifically comprises: Carrying out short-circuit experiments under different short-circuit distances, and collecting current waveform data when short-circuit occurs; And statistically analyzing the current waveform data, and establishing a corresponding relation model between the short circuit distance and the waveform characteristic quantity.
  7. 7. A short circuit identification method for end use electrical collection according to claim 1, wherein after confirming that a short circuit has occurred, the method further comprises: and acquiring a steady-state current value based on the identified flat shoulder wave, and determining the steady-state current value as an alarm current value of the short-circuit event.
  8. 8. A short circuit identification method for end use electrical harvesting as defined in claim 1, further comprising: After each time of judging short circuit and confirming on site, recording waveform characteristic quantity of the short circuit event and corresponding actual short circuit distance; and dynamically correcting the distance interval and the characteristic value measuring range in the preset short-circuit characteristic rule base based on the newly recorded data.
  9. 9. A short circuit identification device for implementing the method according to any of claims 1-8, comprising: the data acquisition module is used for acquiring current signals in the power supply loop in real time and converting the current signals into current waveform data; The characteristic extraction module is used for extracting waveform characteristic quantities from the current waveform data, wherein the waveform characteristic quantities comprise peak clipping characteristics used for describing current limiting characteristics and shoulder flattening characteristics used for describing current steady-state characteristics; And the processing judging module is used for comparing the extracted waveform characteristic quantity with a preset short circuit characteristic rule base and judging whether short circuit occurs or not based on a comparison result.
  10. 10. The short circuit identification device according to claim 9, wherein the device further comprises: The buffer module is used for buffering the current waveform data by utilizing a plurality of buffer areas to form a multi-level buffer queue; the communication module is used for sending the generated alarm information to the gateway in a wireless communication mode after the processing judging module judges that the short circuit occurs; wherein, the alarm information comprises an alarm current value.

Description

Short circuit identification method and device for terminal power utilization acquisition Technical Field The invention relates to a power system fault detection technology, in particular to a short circuit identification method and device for terminal electricity collection. Background At present, two short circuit identification schemes of tail end electricity collection equipment in the market mainly exist, namely, an intelligent air-break internal release and a bimetallic strip are utilized, wherein the release is realized by utilizing a coil trigger mechanism with high current, the bimetallic strip is used for enabling a bimetal to heat to release a mechanical mechanism by utilizing the high current to realize short circuit protection, the method can realize quick protection of short circuit, but mechanical structural support of a load is needed, if only a collection part is needed, a short circuit protection function cannot be realized, the second is that a collection current is utilized to set a specific current threshold value, and alarming is realized by setting a higher current rough judgment current, the method is only suitable for partial specific scenes, the short circuit current in many occasions possibly cannot reach the preset threshold value, the identification rate is low, and when the common air-break quick release protection is realized, the collection equipment does not catch complete short circuit current waveforms in the past, so that a short circuit event cannot be effectively identified, the operation and maintenance personnel are difficult to quickly locate the trip cause, and complicated manual investigation is still needed for a back end load and a circuit. Through retrieval, chinese patent publication No. CN119667364A discloses a method for quickly identifying short-circuit faults of feeder terminal equipment, a fault library is constructed by collecting current signals and setting two thresholds of a current instantaneous value setting value and a current change rate setting value, and double-threshold logic judgment is carried out to realize quick identification of the short-circuit faults. However, the method is still a threshold judgment method based on the current amplitude and the change rate, and the characteristic quantity adopted by the method is single, so that the morphological characteristics of the short circuit waveform cannot be fully utilized. Therefore, how to accurately identify the terminal short circuit by only analyzing the current waveform characteristics on the premise of not depending on a mechanical tripping structure is a technical problem to be solved. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a short circuit identification method and device for terminal electricity acquisition. The aim of the invention can be achieved by the following technical scheme: according to a first aspect of the present invention, there is provided a short circuit identification method for end electricity collection, comprising: Collecting current signals in a power supply loop in real time, and converting the current signals into current waveform data of continuous cycle waves; Parallel caching current waveform data of continuous preset number of cycles to form a multi-level cache queue; Synchronously extracting waveform characteristic quantities of continuous preset number of cycles from the multi-level cache queue, wherein the waveform characteristic quantities comprise peak clipping characteristics for describing current limiting characteristics and shoulder flattening characteristics for describing current steady-state characteristics; carrying out multi-period combination comparison on the waveform characteristic quantity and a preset short circuit characteristic rule base; and judging whether a short circuit occurs or not based on the consistency of the multi-period combined comparison result. As an preferable technical solution, the parallel buffering of current waveform data of continuous preset number of cycles specifically includes: Setting a preset number of cyclically used first-in first-out buffer areas; Storing the latest cycle data acquired in real time into the current buffer area, and sequentially moving the data in each buffer area in the previous period backwards to form the multi-level buffer queue. As a preferable embodiment, extracting the waveform feature amount specifically includes: Identifying amplitude limiting sections exceeding a preset current threshold in a current waveform, counting the number of the amplitude limiting sections as peak clipping waveform, and counting the number of continuous sampling points of the amplitude limiting sections to obtain a peak clipping continuous period; and identifying a steady-state segment in a preset current range in the current waveform, counting the steady-state segment as the number of the shoulder waves, and counting the number of continuous sampling p