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《Electric Power Automation Equipment》 2013-11
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Method for analyzing frequency-domain characteristics of step function in rectangular time window

LI Jun;WAN Wenjun;LIU Zhigang;Electric Power Research Institute of Guangdong Power Grid Company;  
The time window factor may easily influence Fourier transform algorithm in the frequency-domain analysis of nonperiodic signal,resulting in spectrum leakage. A method based on LCR point frequency filter with simpler algorithm is applied to analyze the rectangular time window factor and the conclusion is that, only a narrow low-frequency part of step signal is affected and the affected part decreases along with the increase of time window length. The amplitude-frequency characteristic of an inertial section is analyzed with the proposed method and its result is very close to that of theoretic amplitude-frequency characteristic analysis. The frequency-domain characteristics of an object in the second-stage superheated steam temperature control of boiler are identified by the proposed method.
【CateGory Index】: TP13;TN911.6
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