【摘要】 考虑交流侧电网中谐波与三相不平衡对纹波的影响以及纹波的叠加,对交直流混合微电网中的纹波问题进行研究,提出在k次谐波源三相相位角变化时,其产生的k+1次与k-1次纹波的幅值是此消彼长的关系,对纹波的叠加有影响。证明当同次正序谐波之间、负序谐波之间及相邻次数的正序和负序谐波之间进行叠加时,谐波的初相位差对叠加纹波幅值的影响具有一定的规律性,最后,通过Matlab/Simulink建模对研究进行验证。由仿真结果可知,交直流混合微电网中纹波叠加的幅值与谐波次数及谐波源的初相位差有关。该文研究对混合微电网的电能质量分析和治理具有重大意义。更多还原

【Abstract】 With the consideration of the effect of harmonic and three-phase unbalance on ripple and the superposition of ripple in AC side grid, the ripple problem in AC/DC hybrid micro grid is studied in this paper. Firstly, It is proposed that if the phase angle of the k-order harmonic source changes in its three phases, the amplitude of the k+1 and k-1 ripple generated by the kth harmonic source is the reciprocal relationship,which has an impact on the superposition of ripple.Then, it is found that the effect of the initial phase difference of harmonics on the amplitude of the superimposed ripple has a certain regularity by superimposing the positive order harmonics of the same number, the negative order harmonics of the same number and the positive order and negative order harmonics of adjacent times.Finally, the above studies are confirmed by Matlab/Simulink modeling. It is shown that the amplitude of ripple superposition in AC-DC hybrid micro grid is related to the harmonic frequency and initial phase difference of harmonic source. The research of this paper is of great significance to the analysis and management of power quality in hybrid micro grid.更多还原