一种无时延的改进d-q变换在动态电压扰动识别中的应用  

APPLICATION OF IMPROVED d-q TRANSFORM WITHOUT TIME DELAY IN DYNAMIC VOLTAGE DISTURBANCE IDENTIFICATION

作　　者：赵国亮[1] 刘宝志[1] 肖湘宁[1] 徐永海[1] 

机构地区：[1]华北电力大学电力工程系,北京102206

出　　处：《电网技术》2004年第7期53-57,共5页Power System Technology

基　　金：国家教育部博士点专项基金项目(20010079002)

摘　　要：提出了一种无时延的改进d-q变换法,该方法所用数据具有同时性,克服了常规在d-q变换只适用于识别三相对称电压扰动及延迟60°构造三相电压的镜像扰动等缺点,能够对三相或单相电力系统的电压扰动进行识别,还具有所提取的特征量物理意义明确、实时性好、容易检测突变和对某些扰动进行放大等特点,并在动态电压扰动仿真识别中取得了较好效果。An improved d-q transform method without time delay is proposed. This method overcomes the shortcoming in conventional d-q transform, i.e., it can only identify the voltage disturbance occurred in symmetrical three phase system. In this improved transform method the applied data is simultaneous, so the defects such as the dummy disturbance which appears in constructing three phase system by the delay of 60° is remedied. In addition, the presented method can identify the voltage disturbances occurred in single phase or in three phase systems and it possesses following merits: determinate physical significance, good real-time performance, easy to detect the abrupt change and to amplify some disturbances. In the identification and simulation of dynamic voltage disturbance, good results is obtained by use of this method.

关 键 词：电力系统 电压扰动 d—q变换 识别 仿真 小波变换 

分 类 号：TM743[电气工程—电力系统及自动化]