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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 novel parallel high voltage bulk active power filter based on harmonic flux compensation principle is proposed. By analyzing the voltage equation of the parallel shunt transformer with air gap, it can be seen that when the condition of harmonic flux compensation is satisfied, the branch of the transformer can have a low impedance of approximately 0 to the harmonic after the active filter is put into operation. The wave is high impedance to divert the harmonic currents in the power system. Harmonic current detection of the new filter is located in the parallel transformer branch, the detection of current and feedback current common core. The secondary side of the parallel transformer adopts the structure of multiple compensation windings to solve the large-capacity problem of the active filter. Simulation and experimental results show that this scheme can achieve good filtering effect.