| 基于DFT频域校正的介质损耗角测量算法 |
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| 引用本文： | 杜林,郭良峰,雷静,庞军.基于DFT频域校正的介质损耗角测量算法[J].重庆大学学报(自然科学版),2009,32(3). |
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| 作者姓名： | 杜林 郭良峰 雷静 庞军 |
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| 作者单位： | 杜林,郭良峰,庞军,DO Lin,GUO Liang-feng,PANG dun(重庆大学电气工程学院,输配电装备及系统安全与新技术国家重点实验室,重庆,400030);雷静,LEI ding(重庆市电力公司,沙坪坝供电局,重庆,400030)
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| 摘 要： | 离散傅里叶变换(discrete Fourier transform,DFT)求解容型设备介质损耗角存在较大误差,对引起误差原因的频谱泄漏进行了详细分析和阐述,指出电网频率波动是造成测量介质损耗角不准确的主要因素,其带来的非整周期采样造成信号能量发散,各频率处信号能量相关性不为0.通过加余弦窗函数平滑信号陡度,对DFT相位频谱校正给出了2种不同的方法:加窗插值算法和离散频谱相位差校正法,并通过校正频率偏移量,在频谱峰值最大值处获得信号相位.通过Matlab仿真分析表明,2种算法实现方便,精度高,具有一定的实用性.
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| 关 键 词： | 介质损耗角 频谱泄漏 离散傅里叶变换 加窗插值算法 相位差 频率波动 |
Measurement of dielectric loss based on discrete Fourier transform spectrum correcting algorithms |
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| DU Lin,GUO Liang-feng,LEI Jing,PANG Jun.Measurement of dielectric loss based on discrete Fourier transform spectrum correcting algorithms[J].Journal of Chongqing University(Natural Science Edition),2009,32(3). |
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| Authors: | DU Lin GUO Liang-feng LEI Jing PANG Jun |
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| Institution: | 1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology;College of Electrical Engineering;Chongqing University;Chongqing 400030;P.R.China;2.Shapingba Power Supply Bureau;Chongqing Electric Power Company;P.R.China |
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| Abstract: | Great error is present in measuring dielectric loss of capacitive equipment using discrete Fourier transform(DFT) waveform analysis of multifrequency signals due to spectrum leakage.We analyze the spectrum leakage in detail.It is shown that the energy of the signals will transpire because of the frequency fluctuation which brings asynchronous sampling,and the energy correlation between different frequency points is not zero.Two different methods which adopt frequency offset to measure the signal phase on th... |
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| Keywords: | dielectric loss angle spectrum leakage discrete Fourier transform window and interpolation algorithm phase difference frequency fluctuation |
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