适用于三相不平衡的新型谐波检测方法研究剖析.doc

适用于三相不平衡的新型谐波检测方法研究 赵辉1,2，吕新亚2，王红君2，岳有军2 （1.天津农学院，天津，300384； 2.天津市复杂控制理论与应用重点实验室（天津理工大学），天津，300384) 摘要：针对传统谐波检测方法在三相不平衡条件下检测结果误差较大的问题，本文提出一种适用于三相不平衡的新型谐波检测方法，可以同时补偿三相电压不平衡和电网谐波电流。该方法中，补偿参考电压信号由补偿三相不平衡参考电压信号和补偿谐波电流参考电压信号两部分组成。采用对称分量法得到三相不平衡的参考电压信号。采用电压矢量分解得到代表不同功率成分的电压分量，提取代表谐波功率成分的电压分量作为补偿系统谐波电流的参考电压信号，再把两部分的参考信号进行叠加，得到总的补偿参考电压信号。最后，把新型谐波检测方法带入RITHAPF实验模型进行验证，结果表明，新型谐波检测方法能够同时补偿三相不平衡电压和电网谐波电流，且在硬件实现上更加简单、快速，具有较好的实用性。 关键词：谐波检测；三相不平衡；广义瞬时功率理论；电压矢量分解；补偿电压参考信号 TM464 文献标识码：A 文章编号： Study on New Method for Harmonic Detection Working under Unbalanced Supply Conditions ZHAO Hui1,2，LV Xinya2 ，WANG Hongjun2，YUE Youjun2 (1.Tianjin Agricultural University,?Tianjin?300384,China; 2.Tianjin?Key?Laboratory?of?Control?Theory??Applications?in?Complicated?System,?Tianjin?University?of?Technology,?Tianjin?300384,China) Abstract:Aiming at the problem of large error of the traditional detection method under unbalanced supply conditions, a new method for harmonic detection working under unbalanced supply conditions is put forward, which can compensates for source voltage unbalance and source current harmonics. The reference voltage signal is composed of the unbalanced reference voltage signal and the compensation harmonic current reference voltage signal. The unbalanced reference voltage signal is obtained by the symmetrical component method. The voltage vector is decomposed to different voltage components which represent power components, and the harmonic components are extracted as the reference signal of the compensation harmonic current reference voltage signal. Then the total compensation reference voltage signal is obtained by superimpossing the two part of the reference signals. Finally, the new harmonic detection method is brought into the RITHAPF model for verification. The results show that the new harmonic detection method can compensates for source voltage unbalance and source current harmonics, and the digital implementation is simpler and faster, has