基于相空間重構(gòu)的電壓缺口檢測及特征參數(shù)辨識
發(fā)布時(shí)間：2018-11-13 16:27
【摘要】：電壓缺口是由靜電放電、電力電子設(shè)備換相等引起的電網(wǎng)電壓周期性擾動(dòng)。電壓缺口擾動(dòng)的頻率非常高,用常規(guī)信號分析方法很難準(zhǔn)確檢出。該文提出一種利用相空間重構(gòu)理論對電壓缺口進(jìn)行檢測和特征參數(shù)辨識的方法。利用坐標(biāo)延遲法重構(gòu)吸引子,采用互信息函數(shù)法確定最優(yōu)時(shí)延,通過計(jì)算序列的關(guān)聯(lián)維數(shù)確定最佳嵌入維。電壓缺口信號重構(gòu)相空間后的相軌跡被分為常規(guī)和擾動(dòng)兩部分,據(jù)此對電壓缺口進(jìn)行檢測并提取出缺口發(fā)生角度、寬度、均方根深度和最大深度等特征參量。仿真結(jié)果表明提出的方法可準(zhǔn)確檢測電壓缺口并實(shí)現(xiàn)特征參數(shù)的有效辨識,并將所提方法與小波變換檢測方法進(jìn)行對比。該文所提方法避免了傳統(tǒng)方法運(yùn)算量大、難以進(jìn)行實(shí)時(shí)分析的缺點(diǎn)。
[Abstract]:Voltage gap is the periodic disturbance of power grid voltage caused by electrostatic discharge and replacement of power electronic equipment. The frequency of voltage gap disturbance is very high, it is difficult to detect it accurately by conventional signal analysis method. In this paper, a phase space reconstruction theory is proposed to detect voltage gap and identify characteristic parameters. The attractor is reconstructed by the coordinate delay method, the optimal delay is determined by the mutual information function method, and the optimal embedding dimension is determined by calculating the correlation dimension of the sequence. The phase trajectory of the reconstructed phase space of the voltage gap signal is divided into two parts: conventional and perturbed. Based on this, the characteristic parameters of the voltage gap such as the angle, width, root mean square depth and maximum depth of the voltage gap are detected and extracted. The simulation results show that the proposed method can accurately detect the voltage gap and realize the effective identification of the characteristic parameters. The proposed method is compared with the wavelet transform detection method. The method proposed in this paper avoids the disadvantages of the traditional method, which is difficult to analyze in real time.
【作者單位】： 電力電子節(jié)能與傳動(dòng)控制河北省重點(diǎn)實(shí)驗(yàn)室(燕山大學(xué));
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51477147,51607153) 河北省自然科學(xué)基金項(xiàng)目(E2016203268) 河北省教育廳資助科研項(xiàng)目(QN2015124)~~
【分類號】：TM930
[Abstract]:Voltage gap is the periodic disturbance of power grid voltage caused by electrostatic discharge and replacement of power electronic equipment. The frequency of voltage gap disturbance is very high, it is difficult to detect it accurately by conventional signal analysis method. In this paper, a phase space reconstruction theory is proposed to detect voltage gap and identify characteristic parameters. The attractor is reconstructed by the coordinate delay method, the optimal delay is determined by the mutual information function method, and the optimal embedding dimension is determined by calculating the correlation dimension of the sequence. The phase trajectory of the reconstructed phase space of the voltage gap signal is divided into two parts: conventional and perturbed. Based on this, the characteristic parameters of the voltage gap such as the angle, width, root mean square depth and maximum depth of the voltage gap are detected and extracted. The simulation results show that the proposed method can accurately detect the voltage gap and realize the effective identification of the characteristic parameters. The proposed method is compared with the wavelet transform detection method. The method proposed in this paper avoids the disadvantages of the traditional method, which is difficult to analyze in real time.
【作者單位】： 電力電子節(jié)能與傳動(dòng)控制河北省重點(diǎn)實(shí)驗(yàn)室(燕山大學(xué));
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51477147,51607153) 河北省自然科學(xué)基金項(xiàng)目(E2016203268) 河北省教育廳資助科研項(xiàng)目(QN2015124)~~
【分類號】：TM930
【相似文獻(xiàn)】
相關(guān)期刊論文 前5條
1 林意;程誠;;基于相空間重構(gòu)的負(fù)荷動(dòng)態(tài)分析[J];淮海工學(xué)院學(xué)報(bào)(自然科學(xué)版);2011年01期
2 武峰雨;樂秀t，
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