Based on the integer period sample FFT algorithm, a lowest total harmonicdistortion (THD) method for determining the base period is proposed in this paper, and the derivation is theoretically given.
A precept of distortion control which USES harmonic notch feedback method is discussed in this paper. The control process is analyzed, and the feed-back arithmetic is given.
本文提出了利用谐波陷波法反馈方式进行失真度控制的一种方案，分析了控制过程，并给出了反馈算法。
3
In order to reduce total harmonicdistortion factor of the inverter's output voltage, adding LC filter to inverter's output is a simple and practical method adopted extensively currently.