新能源场站高比例接入下主流类型工频量距离保护比对
Comparison of manufacturers'power frequency distance protection algorithms with high proportion of renewable energy
王丹枫 1刘素梅 1郑燃 2李伟 3于子轩1
作者信息
- 1. 北京林业大学 工学院,北京 100083
- 2. 国网浙江省电力有限公司金华供电公司,浙江 金华 321000
- 3. 电网安全与节能国家重点实验室(中国电力科学研究院),北京 100192
- 折叠
摘要
新能源场站高比例接入电网后,已有广泛应用的工频量距离保护判据存在无法准确识别电网故障的问题.文章着重从装置中保护判据与工频量提取算法入手,对比分析新能源场站高比例接入场景下不同类型距离保护算法的适应性.针对保护判据,对比分析了方向圆、多边形、比相式以及工频变化量距离保护各自的适应性,明确了能够较好适用于新能源场站高比例接入的距离保护判据.针对工频量提取算法,探究了不同类型新能源场站所提供短路电流中非周期谐波量的变化特性,进一步推导了受谐波量影响的傅里叶算法对工频量提取产生的计算误差,确定了影响工频量提取精度的关键谐波分量.
Abstract
With the increasing connection of renewable energy power plants(REPPs),there are some problems that power frequency distance protection criterion cannot identify grid faults.Therefore,this paper focuses on the extraction algorithm of power frequency and protection criteria in the device,and analyzes the adaptability of distance protection algorithms from different manufacturers with high proportion of renewable energy power plants.Regarding the power frequency extraction algorithm,the aperiodic component characteristics of the short-circuit current provided by different renewable energy power plants were explored.The error of Fourier algorithm caused by the influence of harmonic was further derived.For the protection criteria,the adaptability of directional circle,polygon,phase comparison,and power frequency variation distance protection was compared and analyzed,and the distance protection criteria that can be well applied to high proportion of renewable energy power plants were clarified.
关键词
新能源场站/距离保护判据/工频量提取/短路电流/谐波分量Key words
renewable energy power plants/distance protection operating equation/fundamental frequency extraction/short-circuit current/harmonic component引用本文复制引用
基金项目
国家自然科学基金(52107069)
中央高校基本科研业务费专项(2018BLRD02)
出版年
2024
国家科技期刊平台
NSTL
万方数据