电网谐波分析与滤除系统的研制

论述了电网谐波分析与滤除系统的结构、原理和功能,阐述了谐波的检测与分析、系统控制信号的计算与产生.系统主电路是1个混合有源滤波器,系统软件包括基波及各次谐波的检测、统计分析、历史数据查询和报警等模块.系统采用快速傅里叶变换进行谐波分析,并提出一种改进规则采样法对混合有源滤波器进行谐波跟踪控制.实验结果表明,系统对各电量的检测误差均小于2%,三相电压总畸变率由滤波前的10.5%,11.3%和11.7%下降到滤波后的3.9%,4.2%和4.4%,三相电流总畸变率由滤波前的26.2%,25.7%和25.8%下降到滤波后的7.9%,6.9%和7.4%.

Design of harmonic analysis and elimination system in power grid

A harmonic analysis and elimination system is proposed in this article. The harmonic analysis software and a hybrid active power filter with improved regular sampling method are described. The experimental results show that the detection error is less than 2%, the THDs of voltage of three phases have been reduced to 3.9%, 4.2% and 4.4% from 10.5%, 11.3% and 11.7% respectively, and that the THDs of voltage of three phases have been reduced to 7.9%, 6.9% and 7.4% from 26.2%, 25.7% and 25.8% respectively.