基于自适应阈值信息熵的电压跌落持续时间检测方法  

Detection method of voltage sag duration based on information-entropy and self-adaptive threshold

作　　者：陈伟[1] 张岩[1] 郭建鹏[1] 郝晓弘[1] 田江博[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《中南大学学报（自然科学版）》2013年第S1期327-332,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51267012);甘肃省电网公司科技项目(2010406011);甘肃省高等学校基本科研业务费专项资金项目(1103ZTC141);兰州理工大学优秀青年教师资助计划项目(Q200909)

摘　　要：准确快速地检测出电压跌落的起止时刻及持续时间是对电压跌落扰动水平进行分析和评估的前提和基础。基于信息熵理论,提出一种信息熵中自适应设置阈值的算法,利用该算法可对电压跌落起止时刻进行准确定位,从而准确计算出电压跌落的持续时间。在具有谐波和噪声扰动的情况下对该方法进行仿真分析。仿真结果表明:该方法不但原理简单,而且检测精度较高,具有较强的适应性。It can be a premise and basis for the analysis and evaluation of the voltage sag disturbance level to detect the start-stop time and the duration of sag accurately and quickly.A self-adaptive threshold method was proposed based on information-entropy.Using this method,the starting and ending time of the voltage sag were detected and located,and then the voltage sag duration can be calculated.The simulation with different dropping amplitudes and harmonic waves and noise shows that this method not only has simple principle,but also has higher detection accuracy and strong adaptability.

关 键 词：电压跌落 信息熵 持续时间 自适应阈值 

分 类 号：TM714.2[电气工程—电力系统及自动化]