适用于母线保护的负序电压提取及闭锁方案

发布时间：2018-01-11 16:13

本文关键词：适用于母线保护的负序电压提取及闭锁方案　出处：《电力自动化设备》2017年07期 　论文类型：期刊论文

【摘要】：为解决复合电压闭锁元件中负序电压提取快速性与准确性之间的矛盾,研究了基于瞬时对称分量法和半周积分法的负序电压提取方法。通过在故障启动时刻投入负序电压瞬时值提取算法,消除了由于母线电压突变造成的瞬时值提取误差。设计了采用该方法的母线保护复合电压闭锁方案,并与母线差动保护相配合:在故障启动后1个周期内,采用改进瞬时对称分量法和半周积分法提取负序电压有效值,与采样值差动元件相配合;故障启动满1周期后,采用全周算法和序分量分解法提取负序电压有效值,与相量差动元件相配合。通过数字仿真和RTDS实验验证,整个方案可大幅减小负序电压计算的暂态过程误差,有效提高区内故障时负序电压元件的开放速度,有利于改善复压元件的灵敏度。
[Abstract]:In order to solve the contradiction between the speed and accuracy of negative sequence voltage extraction in compound voltage latch element. The method of extracting negative sequence voltage based on instantaneous symmetric component method and half cycle integral method is studied, and the algorithm of extracting the instantaneous value of negative sequence voltage at fault start time is studied. The instantaneous value extraction error caused by the sudden change of bus voltage is eliminated. A bus protection compound voltage locking scheme using this method is designed and matched with the bus differential protection: within one cycle after the fault start. The effective value of negative sequence voltage is extracted by the improved instantaneous symmetric component method and the half cycle integral method, which is matched with the sampling value differential element. After the start of the fault, the whole cycle algorithm and the sequence component decomposition method are used to extract the effective value of negative sequence voltage, which is matched with the phasor differential element. The results are verified by digital simulation and RTDS experiment. The whole scheme can greatly reduce the transient process error of the negative sequence voltage calculation, improve the opening speed of the negative sequence voltage element in the fault area, and improve the sensitivity of the complex voltage element.
【作者单位】：济南大学自动化与电气工程学院;山东外事翻译职业学院信息工程学院;国网山东省电力公司日照供电公司;
【基金】：山东省自然科学基金资助项目(ZR2014EEM039)~~
【分类号】：TM773
【正文快照】： 0引言对110 k V及以上电压等级变电站的重要母线均应配置独立的母线保护装置[1],以实现母线内部故障的差动保护和断路器失灵保护功能[2]。为防止电流回路异常引起母线保护误动,在差动保护和失灵保护的出口逻辑中,均设置复合电压闭锁元件[3](简称复压元件),复压元件由相电压、

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