摘要
高比例分布式电源接入配网后,产生谐振信号,干扰电能质量。为提升谐振检测精度,提出高比例分布式电源接入配网电能质量谐振检测方法。通过同步采样电路采集配网电能质量原始谐振信号,确保信号采集的同步性与准确性;利用小波变换算法对原始信号进行分解处理,提取奇异性明显的高频信号,有效分离噪声与特征信号;对提取的高频信号进行希尔伯特-黄变换分析,获取谐波频率的瞬时信息;基于谐波频率信息计算其增长率,通过设定阈值判定谐振频率是否存在,完成谐振事件的检测。实验结果表明,设计方法提取的奇异性明显高频信号与实际信号的波形相似度极高,两者几乎一致;谐波频率增长率计算误差最小值达到0.1%,检测精度显著提升。该方法有效解决了高比例分布式电源接入场景下的谐振检测难题,为电能质量治理提供了可靠的技术支撑。
After a high proportion of distributed power sources are connected to the distribution network,resonance signals are generated,which interfere with power quality.To improve the accuracy of resonance detection,a high proportion distributed power source access distribution network power quality resonance detection method is proposed.Collecting the original resonance signal of power quality in the distribution network through a synchronous sampling circuit to ensure the synchronization and accuracy of signal acquisition.Using wavelet transform algorithm to decompose and process the original signal,extracting high⁃frequency signals with obvious singularity,effectively separating noise and feature signals.Perform Hilbert⁃Huang Transform analysis on the extracted high⁃frequency signal to obtain instantaneous information on harmonic frequencies.Calculate the growth rate based on harmonic frequency information,determine the existence of resonance frequency by setting a threshold and complete the detection of resonance events.The experimental results show that the singularity extracted by the design method is significant,and the waveform similarity between the high⁃frequency signal and the actual signal is extremely high,almost identical.The minimum calculation error of harmonic frequency growth rate reaches 0.1%,and the detection accuracy is significantly improved.This method effectively solves the problem of resonance detection in high proportion distributed power access scenarios,providing reliable technical support for power quality governance.
作者
牛卫平
祁萌
孔真真
宗一
NIU Weiping;QI Meng;KONG Zhenzhen;ZONG Yi(State Grid Henan Electric Power Company Kaifeng Power Supply Company,Kaifeng 475000,China)
出处
《电子设计工程》
2025年第24期127-130,137,共5页
Electronic Design Engineering
基金
国网河南省电力公司开封供电公司科技项目(SGHAKF00XTJS2500451)。
关键词
分布式电源
电能质量
配电网
奇异性检测
谐振检测
distributed power supply
power quality
distribution network
singularity detection
reso⁃nance detection
