基于FPGA和瞬时无功功率理论的谐波检测方法

在本文中讨论了瞬时无功功率理论对电网的三相对称电流的变换,当电网电压为正弦波时,有功电流iP(无功电流iq)只含有6n次谐波(n为正整数),并由此设计出积分算法低通数字滤波器。该滤波器能有效的滤除6n次谐波。将该方案用FPGA器件加以实现,设计中采用了流水线结构的滤波器,大大的提高了FPGA的运算速度并节省了面积。实验仿真证明:这种检测算法可以灵活的处理综合的面积和速度的约束关系,使最后设计达到最优,具有较高的实用价值。

Harmonic Detection Method Based on Instantaneous Reactive Power Theory and FPGA

Based on the instantaneous reactive power theory , tri-phase currents in power system can be transformed into the active current iP and the reactive current iq. If the tri-phase currents are three-phase symmetric , iP ( iq) contains only 6n harmonics ( n is integer) . In this paper an integral algorithm lowpass digital filter is designed. The direct current in iP ( iQ) can pass through this filter damplessly , while 6n harmonics damp thoroughly. A hardware realization module is designed based on FPGA. From the experiment outcome,a conclusion is gained that the connection between synthesis area restriction and speed restriction can be flexibly optimized and result of simulation shows that the scheme is reliable.