郑黎明;贾科;毕天姝;任龙飞;杨哲;

• 1:新能源电力系统国家重点实验室(华北电力大学)
• 2:国家电网公司西北分部

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

Abstract:

Keywords:

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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