有源滤波器在大功率工程中的应用

对于大功率非线性负载，有源电力滤波器受到变流器晶体管功率和开关频率的限制，不能有效地抑制负载谐波电流．为此，提出了一种由并联有源滤波器和串联平波电抗器组成的混合有源滤波系统．实验结果表明，这种滤波系统在不加大有源滤波器带宽的条件下不仅滤波效果明显，而且容量要求小，仅为负载平均功率的2%或更低．

The Application of Active Power Filter in High Power Condition

For high power nonlinear load, pure active electric power filter is limited by the power and switching frequency of the thysitor, so it can't eliminate the load harmonic current effectively. This paper presents a hybrid active filter system, which consisted of shunt active filter and series smoothing reactor. Experimental results indicate that the proposed system not only eliminated load harmonic current obviously but also capacity required is small, only 2% or less of average load power.