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针对分布式电源多点接入的配电系统,提出了一种基于暂态极性保护原理的集成保护新方案。暂态极性比较保护是运用小波变换提取故障暂态高频信号的某一频段信息作为故障判断的依据,通过比较暂态高频信号的极性,迅速准确判断出故障位置。将暂态极性比较保护原理应用于配电网集成保护方案中,以母线作为载体构建集成保护单元,利用本地故障信息和相邻保护单元故障信息对母线各出线以及线路两端信号的极性进行比较,从而对母线故障和线路故障进行判断。与此同时,集成网络保护单元提取多点信息,对整体区域暂态信号极性进行综合比较,实现对故障的快速定位与隔离,为本地保护提供后备保护。最后,利用MATLAB软件对其进行了仿真分析,仿真结果验证了此保护方案的正确性和可行性。
Aiming at distributed power system with multi-point access, a new integrated protection scheme based on transient polarity protection is proposed. The comparison of transient polarity protection is to extract the information of a certain frequency band of the fault transient high-frequency signal as the basis of fault judgment by using wavelet transform. By comparing the polarity of the transient high-frequency signal, the fault location can be quickly and accurately determined. The principle of transient polarity protection is applied to the integrated protection scheme of distribution network. The busbar is used as a carrier to build an integrated protection unit. Using the local fault information and the fault information of the adjacent protection unit, the polarity of the signals For comparison, to bus fault and line fault judgment. At the same time, integrated network protection unit to extract multi-point information, the overall region of the transient signal polarity comprehensive comparison to achieve the rapid fault location and isolation for local protection to provide backup protection. Finally, MATLAB software was used to simulate it, and the simulation results verified the correctness and feasibility of this protection scheme.