A harmonic detection scheme suitable for diversified compensation is built based on the principles and features of the method of ip-iq and its improved method, which is composed of harmonics compensation mode and full harmonics compensation mode of specific orders. Slow dynamic response of the full harmonics compensation mode goes against device control because of fundamental wave in dynamics, but improving the dynamic response by increasing cut-off frequency of low-pass filter will reduce detection precision in steady state. To solve the problem, an improved full harmonics compensation mode using specific harmonics extraction for low-order harmonics and fundamental positive wave is presented. Using higher cut-off frequency of low-pass filter for fundamental positive wave extraction, the improved full harmonics compensation mode can get good precision in steady state. The influence of low-order harmonics extraction and fundamental positive wave extraction on the dynamic response of improved full compensation mode is analyzed. The results of simulation show that improved full compensation modes have good dynamic response and better precision in steady state. This work is supported by National Natural Science Foundation of China (No. 51407184) and Doctoral Fund of Henan Polytechnic University (No. B2016-17).