摘要
系统谐波阻抗是谐波发射水平估计和责任划分的关键参数,传统的估计方法通常适用于系统阻抗恒定和背景谐波电压波动较小的条件。然而运行方式改变、投切阻抗等因素会导致系统阻抗变化,谐振、谐波波动性等现象会导致背景谐波电压有较大范围波动。因此,提出一种基于DBSCAN聚类和数据筛选的系统谐波阻抗估算方法,当系统阻抗变化时,DBSCAN聚类能分离出不同阻抗值对应的数据簇;当背景谐波电压有波动时,数据筛选有利于保留背景谐波电压波动较小的数据段;对聚类和筛选后的数据利用稳健回归法计算系统谐波阻抗。仿真分析结果说明了所述方法能够较好地抑制系统阻抗变化和背景谐波电压波动带来的影响。
System harmonic impedance is the key parameter of harmonic emission level estimation and responsibility division.The traditional estimation method is usually suitable for the condition that the system impedance is constant and the background harmonic voltage fluctuation is small.However,changes in operation mode,switching impedance and other factors will lead to changes in system impedance,and resonance,harmonic fluctuation and other phenomena will cause a large range of fluctuations in the background harmonic voltage.Therefore,a method for estimating system harmonic impedance based on DBSCAN clustering and data filtering is proposed in this paper.When the system impedance changes,DBSCAN clustering can separate data clusters corresponding to different impedance values.When the background harmonic voltage has a large range of fluctuations,the data filtering is beneficial to retain the data segment with small fluctuation of background harmonic voltage.Finally,robust regression method is used to calculate the harmonic impedance of the system for clustering and filtered data.The simulation results show that the proposed method can suppress the influence of the system impedance variation and the background harmonic voltage fluctuation.
作者
雷达
常潇
刘子腾
赵军
张世锋
徐永海
Lei Da;Chang Xiao;Liu Ziteng;Zhao Jun;Zhang Shifeng;Xu Yonghai(State Grid Shanxi Electric Power Research Institute,Taiyuan 030001,China.;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source,North China Electric Power University,Beijing 102206,China)
出处
《电测与仪表》
北大核心
2022年第1期93-98,共6页
Electrical Measurement & Instrumentation
基金
国网山西电力科学研究院资助项目(52053017000K)。
关键词
谐波阻抗
DBSCAN聚类
数据筛选
稳健回归法
harmonic impedance
DBSCAN clustering
data filtering
robust regression method
作者简介
雷达(1985—),男,高级工程师,硕士,从事电能质量与继电保护研究。Email:ld682013@163.com;常潇(1987—),男,高级工程师,博士,从事新能源发电与电能质量研究。;刘子腾(1996—),女,硕士研究生,从事谐波责任划分及其评估指标研究。;赵军(1991—),男,工程师,硕士,从事新能源发电与电能质量研究。;张世锋(1989—),男,工程师,硕士,从事智能电网技术与电能质量研究。;徐永海(1966—),男,教授,博士,从事电能质量分析与控制、电力电子变压器等研究。
