超高次谐波的合并等间隔采样方法  

Combined Equidistant Sampling Method of Supraharmonics

作　　者：王莹鑫 徐永海 陶顺 宋晓庆 安哲 王同勋 WANG Yingxin;XU Yonghai;TAO Shun;SONG Xiaoqing;AN Zhe;WANG Tongxun(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.,Ltd.),Beijing 102209,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206 [2]先进输电技术国家重点实验室(全球能源互联网研究院有限公司),北京市102209

出　　处：《电力系统自动化》2020年第16期161-170,共10页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(SGGR0000DLJS1800405)。

摘　　要：随着电力系统的电力电子化程度不断加深,电力系统电压、电流信号中的超高次谐波成分持续增加。超高次谐波测量频域宽、幅值小且波动性大,传统谐波实时监测设备难以满足需求。文中对现有的典型超高次谐波检测采样方法(全采样、等间隔采样、首末两周期采样)进行了理论推导,比较其在幅值波动情况下的误差大小。在此基础上,提出了一种合并等间隔采样方法,结合波形特点对采样后的数据进行重组,在保证精度的同时有效降低了数据存储量。最后,通过案例对上述采样方法进行了验证。With the increasing power electronization in power system, the supraharmonic components of voltage and current signals in the power system keep increasing. The supraharmonics require wide frequency domain measurement, and their amplitudes are small but have large fluctuations. The conventional harmonic real-time monitoring equipment is difficult to meet the demand. This paper theoretically deduces the existing typical sampling methods for supraharmonic detection(i. e. full sampling, equidistant sampling, first and last cycle sampling). The errors of the above three sampling methods are compared in the case of amplitude fluctuation. On this basis, a combined equidistant sampling method is proposed, which combines the characteristics of waveforms to reconstruct the sampling data. The proposed sampling method can effectively reduce the data storage while ensures the accuracy.Finally, the above sampling methods are verified by cases.

关 键 词：电能质量 超高次谐波 合并等间隔采样 采样方法 在线监测 

分 类 号：TM935[电气工程—电力电子与电力传动]