基于S变换模时频矩阵相似度的短时电能质量扰动分类  

Classification of Short Duration Power Quality Disturbance Based on Module Time-Frequency Matrixes Similarity by S-Transform

作　　者：刘守亮[1] 肖先勇[1] 杨洪耕[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2006年第5期67-71,共5页Power System Technology

摘　　要：提出了一种基于S变换模时频矩阵相似度的短时电能质量扰动分类方法。首先,建立各种扰动的标准模时频矩阵,然后计算扰动信号模时频矩阵与标准模时频矩阵的相似度,按照相似度最大的原则将扰动分类。该方法直接利用S变换结果,而不用增加其它算法或变换,原理简单、计算方便。仿真结果显示,该分类方法在不同噪声水平下均能达到满意的分类正确率,是一种有效的短时电能质量扰动分类方法。A classification method for short duration power quality disturbance （SDPQD） based on similarity of module time-frequency matrixes by S-transform is proposed. At first, the standard module time-frequency matrixes of SDPQD for voltage dips, swells, interruptions, harmonics, oscillatory transients, notches and spikes are constructed, then the similarity of disturbance signal＇s module time-frequency matrixes to standard module time-frequency matrixes is calculated and according to the principle of maximum similarity the disturbances are classified. The proposed method can directly adopt the results of S-transform when other algorithms or transforms are not to be added, so it is simple in principle and easy to calculate. Simulation results show that with the proposed method a satisfied correctness of identification can be achieved, so it is an effective method to classify the SDPQD.

关 键 词：电能质量 S变换 扰动 模时频矩阵 相似度 分类 噪声鲁棒性 

分 类 号：TM711[电气工程—电力系统及自动化]