基于加速梯度投影法的谐波源定位方法

第40卷第6期2018年11月沈一阳一工一业一大一学一学一报

Journal of Shenyang University of Technology Vo l .40No .6Nov .2018

收稿日期:2017-11-02.

基金项目:江西省教育厅科学技术研究资助项目(161526);江西省教育厅教学改革研究资助项目(JXJG -14-28-3,JXJG -11-75-7).作者简介:吴一敏(1983-),女,江西景德镇人,讲师,硕士,主要从事电气工程及其自动化等方面的研究.

*本文已于2018-11-0612?29在中国知网优先数字出版.网络出版地址:http :?https://www.360docs.net/doc/6811528631.html, /kcms /detail /21.1189.T.20181105.1006.024.html doi :10.7688/j.issn.1000-1646.2018.06.03

基于加速梯度投影法的谐波源定位方法

*

吴一敏,许仙明,陈一艳,黄灿英

(南昌大学科学技术学院,南昌330029)摘一要:针对传统谐波源定位计算复杂且精度低的问题,结合考虑到谐波源分布的稀疏性,提出了

一种基于加速梯度投影法的谐波源定位方法.以节点的注入谐波电流为状态量,以支路的谐波电

流为量测量建立谐波源定位约束二次规划模型,并基于滞后最速下降法来求解加速梯度投影问

题.该方法能自动选取动量参数,只需要较少的测量值即可快速定位谐波源,显著提高收敛速度.

在不同噪声干扰条件下的仿真实验结果表明,提出的方法能获得更高的谐波源定位精度,且具有

一定的抗噪声能力.

关一键一词:谐波源定位;梯度投影法;稀疏;压缩感知;最速下降法;二次规划;噪声

中图分类号:TM 76一一一文献标志码:A 一一一文章编号:1000-1646(2018)06-0614-06

Harmonic source location method based on accelerated gradient projection algorithm

WU Min ,XU Xian-ming ,CHEN Yan ,HUANG Can-ying

(School of Science and Technology ,Nanchang University ,Nanchang 330029,China )Abstract :In order to solve the complex and low-precision calculation problems of traditional harmonic source location method ,a harmonic source location method based on the accelerated gradient projection algorithm was proposed through taking the sparsity of harmonic source distribution into account.With taking the injected harmonic current of nodes as the state variables and the harmonic current of branch circuit as the measurement variable ,a constraint quadratic programming model for the harmonic source location was established ,and an accelerated gradient projection problems could be solved based on the lagging steepest descent method.The proposed method can automatically select the momentum parameters ,and only needs a few measured values to quickly locate the harmonic source and significantly increase the convergence speed.The results of simulation experiments under different noise conditions show that the proposed method can obtain higher harmonic source location accuracy and has a certain anti-noise ability.

Key words :harmonic source location ;gradient projection algorithm ;sparsity ;compressed sensing ;

steepest descent method ;quadratic programming ;noise

一一目前,随着工业用电设备的负荷迅速增加,电

网系统中存在着大量的谐波注入和低功率因素[1],其不仅导致负载电流失真,且容易引起公共耦合

点处的电压畸变,从而引入谐波电压[2-4].电力系

统中谐波电流和电压的存在增加了线路的损耗,

降低了功率因数,可能导致敏感电子设备出现时间误差[5].确定主谐波干扰源对于提高电网的电能质量(power quality ,PQ )至关重要.常用的谐波源定位包括基于等效电路模型的方法和基于谐波状态估沈一阳一工一业一大一学一学一报一一第40卷万方数据

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