电工技术学报  2018, Vol. 33 Issue (zk1): 112-124    DOI: 10.19595/j.cnki.1000-6753.tces.180554
电力电子与电力传动 |
采用不完全S变换的复杂谐波参数估计
易吉良1, 周曼1, 李中启1, 李军军1, 贺力克2
1. 湖南工业大学交通工程学院 株洲 412007;
2. 湖南工业职业技术学院电气工程学院 长沙 410208
Complex Harmonic Parameters Estimation Using Incomplete S Transform
Yi Jiliang1, Zhou Man1, Li Zhongqi1, Li Junjun1, He Like2
1. College of Traffic Engineering Hunan University of Technology Zhuzhou 412007 China;
2. College of Electrical and Information Engineering Hunan Industry Polytechnic Changsha 410208 China
全文: PDF (26837 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 微电网等产生的间歇性非平稳复杂谐波给用电设备带来不利影响。该文利用不完全S变换(IST)非遍历频谱和非固定窗宽系数的快速灵活的时频分析特性,实现复杂谐波的参数实时精确估计。首先,依据幅值直接测量性原则,确定各关注频率点的最优窗宽系数。其次,采用重叠计算方式求取关注频率点的IST向量,以消除其端部效应,并利用IST向量与原始信号瞬时相位一致性原理,得出频谱干扰条件下谐波瞬时频率和相位的估计算式。最后,通过仿真和实验证明,在快速傅里叶变换(FFT)频谱泄漏最严重的条件下,所提方法估计结果的最大相对误差为1%左右,并能实时跟踪复杂谐波参数的变化。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
易吉良
周曼
李中启
李军军
贺力克
关键词 复杂谐波参数估计不完全S变换频谱泄漏重叠计算    
Abstract:Emerging power supply such as micro grid generates the intermittent non-stationary complex harmonic which brings adverse effects on electrical equipment. A novel technique for complex harmonic parameters estimation is proposed using incomplete S transform (IST) by means of the compute mode of non-ergodic spectrum and non-fixed window width coefficient. Firstly, the optimal window width coefficient of each concern frequency point is determined based on the principle of amplitude directly measuring. Secondly, IST vector of each concern frequency point is calculated using overlapping compute mode, so as to eliminate its end effect. The harmonic instantaneous frequency and phase estimation formulas are obtained use the principle phase coherence between IST vector and original signal. Finally, the effectiveness of the proposed method is validated by simulation and experiment, and the results show that the maximum relative error of estimated parameters is about 1% with the proposed method under the worst spectrum leakage, and it can track the change of complex harmonic parameters in real time.
Key wordsComplex harmonic    parameters estimation    incomplete S transform    spectrum leakage    overlapping compute   
收稿日期: 2018-04-10      出版日期: 2018-09-26
PACS: TM935  
基金资助:湖南省自然科学科教联合基金(2018JJ5017)和湖南省自然科学基金(2018JJ3127)资助
通讯作者: 李中启 男,1985年生,博士,讲师,硕士生导师,研究方向为电动汽车无线充电技术。E-mail:my3eee@126.com   
作者简介: 易吉良 男,1972年生,博士,副教授,硕士生导师,研究方向为电能质量分析与控制。E-mail:58187642@qq.com
引用本文:   
易吉良, 周曼, 李中启, 李军军, 贺力克. 采用不完全S变换的复杂谐波参数估计[J]. 电工技术学报, 2018, 33(zk1): 112-124. Yi Jiliang, Zhou Man, Li Zhongqi, Li Junjun, He Like. Complex Harmonic Parameters Estimation Using Incomplete S Transform. Transactions of China Electrotechnical Society, 2018, 33(zk1): 112-124.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180554          https://dgjsxb.ces-transaction.com/CN/Y2018/V33/Izk1/112