全相位谱法在闪变检测中的应用  

Application of All-phase Spectrum Method to Flicker Detection

作　　者：曾巧燕[1] 杨洪耕[1] 王泽[2] 李红萍 

机构地区：[1]四川大学电气信息学院,成都610065 [2]国网重庆市电力公司璧山供电分公司,重庆402760

出　　处：《电力系统及其自动化学报》2017年第4期66-71,共6页Proceedings of the CSU-EPSA

摘　　要：含调幅波或间谐波的电压信号会引起闪变,但IEC61000-4-15标准中的闪变仪是基于调幅波模型,其缺陷是不能检测高频间谐波引起的闪变。本文提出一种基于全相位谱的闪变检测方法。首先分析了间谐波与闪变的关系,建立了统一的闪变模型,将调幅波或间谐波引起的闪变效应统一表示为电压波动分量,从而转化为闪变贡献量;其次,运用全相位谱分析方法对闪变信号进行频谱分析,通过全相位比值法得到各间谐波分量参数;最后,算例对单频闪变信号和多频闪变信号进行全相位分析,仿真结果与IEC推荐方法和Prony法得到的结果进行对比,证明了本文方法的有效性和准确性。The voltage signals with amplitude waves or inter-harmonics may cause flicker. However, the flicker caused by high frequency inter-harmonics cannot be detected by the flicker-meter as stipulated in the IEC61000-4-15 standard because the meter is based on an amplitude-modulation wave model. In this paper, a flicker detection method is pro- posed based on all-phase spectrum method. Firstly, based on the analysis of the relationship between inter-harmonics and flicker, a unified flicker model is established, and the flicker effect caused by amplitude modulation waves or inter- harmonics is expressed as voltage fluctuation component, which is thus transformed into a contributing factor to the flicker. Secondly, the frequency spectrum of the flicker signal is analyzed using the all-phase spectrum method, and the parameter of each inter-harmonic component is obtained through the all-phase ratio method. Finally, the single and multi-frequency flicker signals are analyzed in numerical examples using the all-phase spectrum method, and the com- parison between the simulation results and those obtained by the IEC recommended method and Prony method indicates the validity and accuracy of the proposed method.

关 键 词：全相位谱 闪变检测 间谐波 IEC闪变仪 电能质量 

分 类 号：TM744[电气工程—电力系统及自动化]