(1. 中南大學(xué) 能源科學(xué)與工程學(xué)院，長沙 410083；
2. 中鋁公司 廣西分公司電解廠，百色 531400)
摘 要: 以采集的160 kA鋁電解槽陽極的電流信號(hào)為基礎(chǔ)，利用Yule-Walker方法的功率譜估計(jì)對(duì)其進(jìn)行分析，提取不同槽況的頻譜特征，并將分析結(jié)果與HHT(Hilbert-Huang transform)的邊際譜分析結(jié)果進(jìn)行對(duì)比。結(jié)果表明：基于Yule-Walker方法的功率譜估計(jì)分析結(jié)果能較好地區(qū)分正常糟、冷槽及陰極破損槽，并得到正常糟、冷槽及陰極破損槽功率譜曲線主譜峰的頻率范圍分別為0.003~0.018、0.023~0.027、0.027~0.031 Hz；對(duì)于不同槽況下的陽極電流信號(hào)，HHT的邊際譜的主譜峰與Yule-Walker方法的功率譜曲線的主譜峰位置一致，表明功率譜估計(jì)分析結(jié)果的可靠性。
關(guān)鍵字: 鋁電解槽；160 kA鋁電解槽；槽況；陽極電流；功率譜估計(jì)；Yule-Walker方法；邊際譜
160 kA aluminum reduction cells in different states
（1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Aluminum Electrolytic Plants, Guangxi Branch of China Aluminum Co., Baise 531400, China）
Abstract:Yule-Walker method was applied to analyzing the power spectrum of anode current signals collected from 160 kA aluminum reduction cells and to extracting the spectral characteristics in different operation states, and then the power spectrum was further compared with the marginal spectrum resulting from HHT(Hilbert-Huang transform). The results show that the power spectrum based on Yule-Walker method is able to distinguish the normal cell, the cold cell and the cell with local failure of cathode surface, and their frequency ranges are recognized to be 0.003−0.018, 0.023−0.027 and 0.027−0.031 Hz, respectively. For the anode current signals from different cell states, the main peak at the power spectrum curve has the same location as that at the marginal spectrum curve, showing the good reliability of Yule-Walker method for the power spectrum estimation of the anode current signals.
Key words: aluminum reduction cell; 160 kA aluminum reduction cell; cell state; anode current; power spectral estimation; Yule-Walker method; marginal spectrum
