基于新型B-N窗和改进分区法的三相不平衡度检测

Three-phase imbalance factor detection based on novel B-N window and improved partition method

国标GB/T 15543-2008要求电压不平衡度计算需在获取基波幅值和相位基础上再求取相序分量,但其计算方法涉及开方运算与相角求取,不利于嵌入式系统实现。因此文中构建新型B-N互卷积窗函数,推导基于新型B-N互卷积窗三谱线改进FFT修正算式,采用改进坐标分区法实现相序分量求取,提出基于新型B-N窗和改进分区法的三相不平衡度检测方法。避免了复杂开方运算,提高了基波幅值和相位的检测精度,最终实现三相不平衡度的准确检测。仿真实验结果表明,文中提出算法在基波、谐波及噪声干扰情况下,均能有效实现不平衡度的准确检测,相比国标推荐方法,实现简单且准确度更高。

The national standard GB/T 15543-2008 requires that the calculation of the voltage imbalance factor needs to obtain the phase sequence component based on the amplitude and phase of the fundamental wave,but its calculation method involves square root calculation and phase angle calculation,which is not conducive to the implementation of embedded systems.Therefore,a novel B-N mutual convolution window is established,the improved FFT correction formula which is based on the novel B-N mutual convolution window and the three-spectral line is derived,the phase sequence component is obtained by using the improved coordinate partition method,and three-phase imbalance factor detection based on novel B-N window and improved partition method is proposed in this paper.Complex square calculation is avoided and the detection accuracy of the amplitude and phase of the fundamental wave is improved,finally,the accurate detection of the three-phase imbalance factor is realized.The simulation experiment results show that the proposed algorithm can effectively achieve the accurate detection of imbalance factor under the conditions of fundamental wave,harmonic and noise interference,the implementation is simple and the accuracy is higher than the recommended method of the national standard.