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《Transactions of China Electrotechnical Society》 2005-11
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Wavelet-Based Predefined-Thredhold Denoising Technique to Power System Signal

Lu Songsheng Liu Zhengzhi (Chinese Academy of Sciences Hefei 230031 China)  
When wavelet transform is used to denoise power system signal, the thresholds are usually calculated with processing signal, which will affect the speed of processing and the accuracy of thresholds. The technique is to denoise power system signal after predefining the threshold while no transients in power system. As thresholds need not to be calculated in denoising, the speed to process signal real-time is improved. At the same time when threshold is calculated, other signal can be regarded as noise except for 50Hz signal, which improve the accuracy of thresholds and since calculating thresholds is not gained atreal-time, better threshold can be calculated using more efficient methods. Simulating and application in practice prove this technique improves denoising effect and have more quickly calculating speed than others.
【Fund】: 国家“九·五”重点科技攻关资助项目(1998[1303])。
【CateGory Index】: TM711
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