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
8期
68-72
,共5页
电能质量%扰动识别%S变换%模时频矩阵%概率密度
電能質量%擾動識彆%S變換%模時頻矩陣%概率密度
전능질량%우동식별%S변환%모시빈구진%개솔밀도
power quality%disturbance recognition%S transform%module time-frequency matrixes%probability density
提出利用S变换下的模时频矩阵对电能质量扰动检测与识别.其核心利用S变换模时频矩阵提取电能质量扰动特征,根据模时频矩阵幅值的概率密度分布建立各种扰动的标准模板,通过计算扰动信号的模时频矩阵与标准模板的欧几里德距离确定扰动信号与各种扰动标准模板的接近程度,进而实现对扰动信号的正确识别,并通过模时频矩阵检测扰动信号的时频域特征.仿真结果表明,该方法具有较好的抗干扰性,且在信噪比较低的情况下仍能达到满意的识别效果,同时检测扰动信号的时频特征具有较高的精度.
提齣利用S變換下的模時頻矩陣對電能質量擾動檢測與識彆.其覈心利用S變換模時頻矩陣提取電能質量擾動特徵,根據模時頻矩陣幅值的概率密度分佈建立各種擾動的標準模闆,通過計算擾動信號的模時頻矩陣與標準模闆的歐幾裏德距離確定擾動信號與各種擾動標準模闆的接近程度,進而實現對擾動信號的正確識彆,併通過模時頻矩陣檢測擾動信號的時頻域特徵.倣真結果錶明,該方法具有較好的抗榦擾性,且在信譟比較低的情況下仍能達到滿意的識彆效果,同時檢測擾動信號的時頻特徵具有較高的精度.
제출이용S변환하적모시빈구진대전능질량우동검측여식별.기핵심이용S변환모시빈구진제취전능질량우동특정,근거모시빈구진폭치적개솔밀도분포건립각충우동적표준모판,통과계산우동신호적모시빈구진여표준모판적구궤리덕거리학정우동신호여각충우동표준모판적접근정도,진이실현대우동신호적정학식별,병통과모시빈구진검측우동신호적시빈역특정.방진결과표명,해방법구유교호적항간우성,차재신조비교저적정황하잉능체도만의적식별효과,동시검측우동신호적시빈특정구유교고적정도.
A classification and recognition method for power quality disturbances based on module time-frequency matrixes by S transform is proposed. The corn of it is that, at first, module time-frequency matrix by S transform is used to indicate the characteristics of power quality distrubance, the standard mode of various distrubances is established on the base of probability density of magnitude of module time-frequency matrix, and then considering euclidean distance between distrubances and standard mode, the degree of similarity can be calculated, and disturbances are classified. And detection precision is also acceptable. The simulation results show that the approach has better anti-interference performance, and classification results in the condition of low SNR and detection precision are also acceptable.
