But the research on harmonic problems has not been reported. 但对这种励磁机的谐波问题的研究尚未见文献报道。
In order to enhance the performance of the hybrid active power filter, and to reduce serious harmonics problems day by day, a new type hybrid active power filter is proposed. 摘要为提高有源滤波器的滤波性能，减少日趋严重的谐波问题，提出了一种滤波系统结构。
