中文摘要：

纹波是直流配电网中一种典型的电能质量问题。纹波谐振不仅影响直流配电网的电能质量,还会危及系统的安全稳定运行。探究了纹波在直流侧网络结构中的谐振现象;对接入端交流侧出现电压畸变和三相不平衡等情况引起的纹波从机理上进行了分析;建立了含变流器的直流配电网的等效电路,推导了变流器接入个数及接入位置对纹波谐振的影响关系;考虑各变流器间的耦合作用,推导了各变流器之间的耦合系数,研究了耦合作用对纹波谐振的影响。仿真结果验证了理论分析和所建模型的正确性。

英文摘要：

Ripple is a typical power quality problem of DC distribution network and ripple resonance not only affects its power quality but also endangers its safe and stable operation. The phenomenon of ripple resonance in the DC-side network structure is studied. The ripple due to the voltage distortion and threephase imbalance at the AC side of input port is analyzed in mechanism. The equivalent circuit of DC distribution network with multiple converters is established and the influences of their number and location on the ripple resonance are researched. The coupling coefficient between converters is deduced and the influence of coupling effect between converters on the ripple resonance is studied. Simulative results verify the validity of theoretical analysis and the established model.