短时电压变动检测方法的研究  

Research on Detection Methods of Short Duration Voltage Change

作　　者：周文[1] 毛志芳[2] 饶群[1] 毛志强 

机构地区：[1]河北省电力研究院,石家庄050021 [2]石家庄供电公司,石家庄050051 [3]行唐供电公司,石家庄050600

出　　处：《河北电力技术》2008年第3期23-25,37,共4页Hebei Electric Power

摘　　要：分析短时电压变动对电能质量的影响,指出衡量短时电压变动的幅值、持续时间及相位跳变3个指标,介绍有效值计算法、瞬时电压dq分解法和小波变换法3种检测短时电压变动的方法,并用Matlab软件对后2种方法进行仿真分析,总结了它们的特点及存在的问题,认为同时测量突变幅值和相位时,选择瞬时电压dq分解法最合适。The effect of the short duration voltage change on the power quality is analyzed,and the three indexes which are amplitude, duration and phase jump are pointed out. RMS method, dq conversion of instantaneous voltage and wavelet transform method are introduced. Besides, the two last methods are simulated by Matlab, while their characteristics and the existing problems are summarized. The result proves that the best method to measure changed voltage magnitude and phase together in these methods is dq conversion of instantaneous voltage.

关 键 词：短时电压变动 瞬时电压dq分解法 小波变换 

分 类 号：TM714[电气工程—电力系统及自动化]