基于ip-iq法谐波检测及其改进方法的原理和特点建立一种适用于多样化补偿的谐波检测方案,其包括特定次谐波补偿模式和全补偿模式.全补偿模式检测结果在动态中含有较大的基波分量,因而较慢的动态响应不利于装置控制,但通过提高低通滤波器截止频率而提升其动态响应会降低稳态检测精度.针对该问题建立一种改进的全补偿模式.改进的全补偿模式由低次谐波的特定提取和基波正序分量提取复合而成,使基波正序分量提取采用较高截止频率的低通滤波器也可以获得较好的低次谐波稳态检测精度,分析低次谐波特定提取和基波正序分量提取两个环节对改进的全补偿模式动态特性的影响.仿真研究表明改进的全补偿模式具有快速的动态响应和更好的稳态检测精度.%A harmonic detection scheme suitable for diversified compensation is built based on the principles and features of the method ofip-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.
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