摘要
提出一种基于谐波磁通补偿原理的新型并联型高压大容量有源电力滤波器。通过对带气隙的线性并联变压器的电压方程分析可知,当满足谐波磁通补偿条件时,可使变压器支路在有源滤波器投入后对谐波呈近似为0的低阻抗、对基波呈高阻抗,从而疏导电力系统中的谐波电流。新滤波器的谐波电流检测位置位于并联变压器支路上,检测电流与反馈电流共铁心。并联变压器的二次侧采用多个补偿绕组的结构以解决有源滤波器的大容量问题。仿真和实验结果证明了该方案可以取得良好的滤波效果。
A new model of parallel active power filter based on the harmonic magnetic flux compensation theory is presented. According to the linear transformer＇ s voltage equations, when the harmonic magnetic flux is compensated, the transformer branch will present a very low impedance to the harmonics current and a high impedance to the fundamental current, therefore most of the harmonics current can be injected into the transformer branch from the power system. The position where the filter detects current is on the transformer branch, so that the detected current and the feedback current share the iron core. In order to design the filter with large capacity, the transformer＇s secondary adopts the structure with multiple compensation windings.Emulation and experimental results prove that this scheme can obtain a good effect in harmonics mitigation.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第12期61-65,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50477047)。
关键词
有源电力滤波器
变压器
谐波磁通补偿
多支路绕组
active power filter
transformer
harmonic magnetic flux compensation
multi-branch windings
