非线性负荷下高准确度数据处理技术

发布时间：2018-01-14 13:06

本文关键词：非线性负荷下高准确度数据处理技术　出处：《高电压技术》2017年09期 　论文类型：期刊论文

【摘要】：对工作于非线性负荷电网下的电子式互感器进行在线校验,数据处理算法的精确度是保证在线校验可靠性的关键。为提高在线校验精度,有效抑制频率波动、间谐波和高次谐波的影响,提出一种基于离散Fourier变换(DFT)算法数据预处理及主频谱修正的改进算法。在离散Fourier变换前对采样数据进行等长度截断叠加,实现相位补偿;构建二阶Hanning自卷积窗函数,对截断采样序列进行离散Fourier变换并提取基频分量,通过主频谱校正得修正后的幅值和相位。采用虚拟仪器开发环境Labview进行仿真,计算了不同叠加次数对改进算法输出值误差的影响,并对几种不同的数据处理算法进行了对比。研究结果表明:叠加次数α=3时,改进算法输出值的误差最小;当电网频率出现±0.5 Hz的频率波动时,改进算法的精确度更高;性能测试结果表明,比差变化0.01%,角差变化0.3′,误差分布均匀且无跳变,准确度可达到0.05级,满足对0.2S级电子式互感器的校验要求。研究结果证明了所提算法的有效性。
[Abstract]:The accuracy of data processing algorithm is the key to ensure the reliability of on-line calibration for electronic transformers working in nonlinear load network. In order to improve the accuracy of on-line calibration, the frequency fluctuation is effectively suppressed. The influence of interharmonics and high-order harmonics. An improved algorithm based on discrete Fourier transform (DFT) algorithm for data preprocessing and main spectrum correction is proposed. The sampling data is truncated and superposed with equal length before discrete Fourier transform. Phase compensation is realized; The second order Hanning self-convolution window function is constructed, the truncated sampling sequence is transformed by discrete Fourier and the fundamental frequency component is extracted. The corrected amplitude and phase are obtained by the correction of the main spectrum. The effect of different stacking times on the output error of the improved algorithm is calculated by using the virtual instrument development environment (Labview). Several different data processing algorithms are compared. The results show that the error of the output value of the improved algorithm is minimum when the superposition number 伪 = 3:00; When the frequency of power grid fluctuates with 卤0.5 Hz, the accuracy of the improved algorithm is higher. The results of performance test show that the error distribution is uniform and there is no jump, and the accuracy can reach 0.05 grade. The results show that the proposed algorithm is effective.
【作者单位】：大连理工大学电气工程学院;国网山西省运城供电公司;南方电网科学研究院有限责任公司;
【基金】：国家自然科学基金(51477024;51337001) 中央高校基本科研业务费专项资金(DUT15ZD234) 强电磁工程与新技术国家重点实验室开放课题基金(2016KF005)~~
【分类号】：TM45
【正文快照】： High Accuracy Data Processing Technology with Non-linear LoadsLIU Zhiheng1,DUAN Xiongying1,LIAO Minfu1,ZOU Jiyan1,ZHANG Wenna2,ZOU Lin3(1.School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China;2.Yuncheng Power Supply Company

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