模块化多电平换流器(modular multilevel converter,MMC)具有运行稳定、控制多样化等优点,对其精确建模成为当前研究热点.提出了一种基于复矢量的MMC交直流侧阻抗建模方法.该方法根据复矢量建模的基本原理分析了换流器的正负序转换关系,并在考虑三相耦合的前提下,从差共模角度简述了三相MMC的建模要点,建立了三相系统的完整时域模型.引入谐波状态空间理论(harmonic state space,HSS)对所建模型进行处理来提高建模精度,并利用接口矩阵及阻抗求解的基本原理建立了MMC的交直流侧阻抗模型.最后在仿真平台进行了对比实验,证实了建模方法的可行性.
AC/DC Impedance Modeling of MMC Based on Complex Vector and HSS
Modular multilevel converter(MMC)has many advantages such as stable operation and diversified control,precise model-ing of which has become a current research hotspot.A complex vector-based impedance modeling method for MMC AC/DC side is proposed.According to the basic principle of complex vector modeling,the positive and negative sequence conversion relationship of converter is analyzed.Under the premise of considering the three-phase coupling,the modeling points of the three-phase MMC are briefly described from the perspective of differential common mode,and the complete time domain model of the three-phase system is established.The theory of harmonic state space(HSS)is introduced to process the model to improve the modeling accuracy,and the basic principle of interface matrix and impedance solution is introduced to complete the establishment of AC/DC impedance model of MMC.Finally,a comparison experiment is carried out on the simulation platform,which proves the feasibility of the modeling method.
modular multileval converter(MMC)AC/DC impedance modelingharmonic state spacecomplex vector modelingHVDC
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