基于结构相似度与平方误差的新能源场站送出线路纵联保护综合判据Comprehensive Criteria of Pilot Protection Based on Structural Similarity and Square Error for Outgoing Line from Renewable Power Plants
郑黎明;贾科;毕天姝;任龙飞;杨哲;
摘要(Abstract):
电力电子装置在新能源电力系统中的广泛应用,改变了传统电力系统的故障特性,使得传统保护动作性能下降、甚至存在误动和拒动风险,从而给电网的安全稳定运行带来挑战。在分析新能源送出线路两侧故障波形差异的基础上,提出了基于结构相似度与平方误差的纵联保护综合判据。该方法首先利用小波变换实时提取两侧电流中各频段的信息,通过结构相似度与平方误差综合判据识别区内、外故障。将所提综合判据固化在保护装置中,通过硬件在环动模仿真实验验证了所提原理的有效性:所提方法可解决新能源接入后差动保护动作性能下降问题,适应不同类型新能源场站,具有耐受过度电阻能力,与现有基于新能源暂态电流特征的保护相比,在新能源电源弱出力以及重合于永久性故障时动作性能更好。现场录波数据也验证了所提方法的有效性。
关键词(KeyWords): 新能源场站;结构相似度;平方误差;纵联保护;综合判据
基金项目(Foundation): 国家重点研发计划项目(2018YFB0904104);; 国家自然科学基金项目(51725702,51777071);; 国家电网公司科技项目(SGNW0000DKJS1900197)~~
作者(Author): 郑黎明;贾科;毕天姝;任龙飞;杨哲;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.0934
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