| 引用本文: | 徐志钮,律方成,李和明,XU Zhiniu,Lü Fangcheng,LI Heming.存在脉冲噪声情况下的介损角算法[J].电力自动化设备,2008,(2):45-48 |
| .Dielectric loss angle algorithm considering impulsive noise[J].Electric Power Automation Equipment,2008,(2):45-48 |
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| 摘要: |
| 脉冲干扰是影响介损角测量精确度的重要因素之一,对含有脉冲噪声的电压和泄漏电流信号必须使用滤波方法进行抑制。采用53H算法抑制采样所得电压和电流信号中的脉冲噪声。对滤波前后的信号分别使用了相关函数法、高阶正弦拟合法、加汉宁窗插值算法、谱泄漏对消算法、改进基波相位分离法和改进修正理想采样频率法计算介损角,发现各种算法对滤波后信号的计算结果均要比滤波前信号使用对应算法具有更高的精确度;无论是对滤波前信号还是滤波后信号改进基波相位分离法和改进修正理想采样频率法均具有更高的精确度。同时分析了53H算法的相关参数对算法精确度的影响。对信号使用53H算法滤波后,使用改进基波相位分离法和改进修正理想采样频率法能有效提高在脉冲情况下介损角测量的精确度。 |
| 关键词: 介损角,脉冲噪声,53H算法,数字化算法 |
| DOI： |
| 分类号:TM835.4 |
| 基金项目: |
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| Dielectric loss angle algorithm considering impulsive noise |
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XU Zhiniu LI Heming
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| Abstract: |
| Impulsive noise influences the measurement accuracy of dielectric loss angle seriously,which must be filtered out from the voltage and leakage current signals.53H algorithm is used to suppress the impulsive noise in sampled voltage and current signals.Different methods are used to calculate the dielectric loss angle from the signals before and after filtering:the correlation function algorithm,the high-order sine fitting algorithm,the Hanning-windowing interpolation algorithm,the spectral leakage canceling algorithm,the modified fundamental harmonic separation algorithm and the improved modified ideal sampling frequency algorithm.Results show that,for each method,the calculated angle from the filtered signals is more accurate than that from the original signals,while the modified fundamental harmonic separation algorithm and the improved modified ideal sampling frequency algorithm have higher accuracy than other methods for both filtered and original signals.The influence of 53 H algorithm parameters on dielectric loss angle measurement accuracy is also analyzed.The algorithm integrated with 53 H algorithm and modified fundamental harmonic separation algorithm or improved modified ideal sampling frequency algorithm can effectively improve dielectric loss angle measurement accuracy in present of impulsive noise. |
| Key words: dielectric loss angle,impulsive noise,53H algorithm,digital algorithm |
