Islanding protection acceleration method using voltage high-frequency transient quantity

By acquiring voltage signals and calculating high-frequency transients in real time in the anti-islanding protection device, reliable ride-through during system disturbances and rapid action in islanded state are achieved, solving the problems of false operation and complexity in the prior art and simplifying the fault identification process.

CN122418591APending Publication Date: 2026-07-17SHANDONG KEHUI POWER AUTOMATION
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Patent Information

Application Number
CN202610487897.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing anti-islanding protection is prone to malfunction during system disturbances, and cannot simultaneously meet the requirements of reliable traversal during system disturbances and rapid response during islanding operation. Furthermore, existing technical solutions are complex or require additional equipment, making it difficult to achieve rapid identification of local faults and rapid disconnection of distributed power sources.

Method used

By installing an anti-islanding protection device, voltage signals are collected in real time, high-frequency transient quantities of voltage surges are calculated, and high-pass filtering is used to process the data sequence to determine whether the voltage signal surge meets the fault conditions. If it does, the action time of the anti-islanding protection is adjusted to a short set value to achieve rapid action.

Benefits of technology

It achieves reliable traversal during system disturbances and rapid action in islanded states, avoids malfunctions, simplifies criterion calculations, has high engineering practicality, and requires no additional equipment.

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Abstract

一种利用电压高频暂态量的防孤岛保护加速方法，电力系统继电保护领域。包括如下步骤：步骤a，安装防孤岛保护装置；步骤b，将防孤岛保护装置的动作时长限设为长定值，并实时采集三条相线的电压信号；步骤c，计算电压信号突变量时域值；步骤d，判断电压信号突变量时域值是否大于预设门槛值；步骤e，在电压信号突变量时域波形上截取数据，得到数据序列；步骤f，检测数据序列是否满足故障设定条件。在本申请的利用电压高频暂态量的防孤岛保护加速方法中，利用电压突变量中的高频暂态量实现了系统扰动与本地故障的识别，避免了防孤岛电压 / 频率保护在系统扰动时误动作，同时能够在孤岛状态时加速防孤岛电压 / 频率保护，使其快速动作。
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Citation Information

Patent Citations

  • An active distribution network fault location method and system based on fault transient signals

    CN116359674B

  • Anti-islanding protection constant value adaptive configuration method based on fault characteristic quantity

    CN117691738A

  • Island protection method based on switching of fast action and slow action

    CN119518910A