Based on the integer period sample FFT algorithm, a lowest total harmonic distortion (THD) method for determining the base period is proposed in this paper, and the derivation is theoretically given.

在整周期采样的FFT算法的基础上，提出了确定基波周期的总谐波畸变(THD)最小的方法，并作了误差分析。

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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。

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In order to reduce total harmonic distortion factor of the inverter's output voltage, adding LC filter to inverter's output is a simple and practical method adopted extensively currently.

为了降低逆变器输出电压的谐波，简单且实用的方法是在逆变器的交流输出侧加装l C滤波器。

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