电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
2期
132-137
,共6页
自适应滑窗%ESPRIT%电能质量扰动%时频分析%非平稳信号
自適應滑窗%ESPRIT%電能質量擾動%時頻分析%非平穩信號
자괄응활창%ESPRIT%전능질량우동%시빈분석%비평은신호
adaptive sliding window%ESPRIT%power quality disturbance%time-frequency analysis%non-stationary signal
针对 ESPRIT 算法无法分析非平稳电能质量扰动的问题,提出了一种基于自适应滑窗-旋转不变子空间算法(Adaptive Sliding Window ESPRIT,ASW-ESPRIT)的时频分析方法.该方法首先根据非平稳电能质量扰动信号特征,采用自适应滑窗对信号数据进行分块,然后利用 ESPRIT 算法对每块中的数据进行处理,检测出频率和幅值信息,接着联合所有窗口的分析结果,从而得到整个信号的时频率分布信息.最后对电能质量干扰的非平稳信号进行了仿真实验,实验结果表明,所提出的方法适合动态电能质量扰动检测,具有实际应用前景.
針對 ESPRIT 算法無法分析非平穩電能質量擾動的問題,提齣瞭一種基于自適應滑窗-鏇轉不變子空間算法(Adaptive Sliding Window ESPRIT,ASW-ESPRIT)的時頻分析方法.該方法首先根據非平穩電能質量擾動信號特徵,採用自適應滑窗對信號數據進行分塊,然後利用 ESPRIT 算法對每塊中的數據進行處理,檢測齣頻率和幅值信息,接著聯閤所有窗口的分析結果,從而得到整箇信號的時頻率分佈信息.最後對電能質量榦擾的非平穩信號進行瞭倣真實驗,實驗結果錶明,所提齣的方法適閤動態電能質量擾動檢測,具有實際應用前景.
침대 ESPRIT 산법무법분석비평은전능질량우동적문제,제출료일충기우자괄응활창-선전불변자공간산법(Adaptive Sliding Window ESPRIT,ASW-ESPRIT)적시빈분석방법.해방법수선근거비평은전능질량우동신호특정,채용자괄응활창대신호수거진행분괴,연후이용 ESPRIT 산법대매괴중적수거진행처리,검측출빈솔화폭치신식,접착연합소유창구적분석결과,종이득도정개신호적시빈솔분포신식.최후대전능질량간우적비평은신호진행료방진실험,실험결과표명,소제출적방법괄합동태전능질량우동검측,구유실제응용전경.
Since the ESPRIT algorithm can not analyze non-stationary power quality disturbances, we present a time-frequency analysis method based on adaptive sliding window-ESPRIT algorithm. According to the characteristics of non-stationary power quality signal, the signal is firstly divided into small blocks by the adaptive sliding window. In order to get the frequencies and amplitudes of each block, an ESPRIT algorithm is then applied. Next, it receives the whole information of time-frequency distribution with the parameters of each block. At last, simulations of several non-stationary signals are conducted; the results have strongly indicated that the proposed method is very suitable for the detection of power quality disturbance with practical application prospect.