《电力自动化设备》

引用本文:	朱亮,温和,戴慧芳,赵震宇,张春强.计及噪声的动态谐波准同步采样分析方法[J].电力自动化设备,2018,(2):
	ZHU Liang,WEN He,DAI Huifang,ZHAO Zhenyu,ZHANG Chunqiang.Dynamic harmonic analysis method based on quasi-synchronous sampling algorithm considering noise[J].Electric Power Automation Equipment,2018,(2):

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计及噪声的动态谐波准同步采样分析方法
朱亮¹, 温和², 戴慧芳², 赵震宇¹, 张春强¹
1.国网江西省电力有限公司电力科学研究院，江西南昌330096;2.湖南大学电气与信息工程学院，湖南长沙410082

摘要:

电网中非线性负荷投切等使谐波具有明显的动态特性，为此，提出一种基于准同步采样算法的动态谐波分析方法，从理论层面分析噪声对谐波频率测量的影响，建立谐波频率测量方差理论式。准同步采样算法通过复化梯形积分和迭代法计算信号局部频谱，通过适当增加采样周期和迭代次数减小同步偏差对测量准确度的影响。仿真和实验结果表明所提算法能准确测量谐波参数。

关键词: 动态谐波准同步采样算法复化梯形积分噪声

DOI：10.16081/j.issn.1006-6047.2018.02.028

分类号:TM711

基金项目:国家自然科学基金资助项目(61370014,61771190)；湖南省科技计划重大专项(2017GK1051)

Dynamic harmonic analysis method based on quasi-synchronous sampling algorithm considering noise

ZHU Liang¹, WEN He², DAI Huifang², ZHAO Zhenyu¹, ZHANG Chunqiang¹

1.Power Research Institute of State Grid Jiangxi Electric Power Company, Nanchang 330096, China;2.College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Abstract:

The harmonic has obvious dynamic characteristics caused by the switching of nonlinear load, for which, a dynamic harmonic analysis method based on QSSA(Quasi-Synchronous Sampling Algorithm) is proposed. The impact of noise on harmonic frequency measurement is analyzed theoretically, and the theoretical variance expression of harmonic frequency measurement is built. QSSA calculates local signal spectrum by composite trapezoidal integration and iteration procedure, and reduces the impact of synchronous deviation on measurement accuracy by increasing sampling period and the number of iteration. Simulative and experimental results show that the proposed method can accurately measure the harmonic parameters.

Key words: dynamic harmonic quasi-synchronous sampling algorithm composite trapezoidal integration noise

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