gusucode.com > 基于不对称双子模块的混合MMC及其直流故障自清除能力 > 基于不对称双子模块的混合MMC及其直流故障自清除能力\文件说明.txt

     柔性直流输电技术及能源互联网的迅速发展,大大拓展了电力电子变流技术在电力系统输配电领域的应用。由于柔性直流输电架空线路较常出现瞬时性故障,研究了具有直流故障自清除能力的不对称双子模块结构。首先,详细阐述不对称双子模块的拓扑结构、工作原理和控制方法。在此基础上,详细分析不对称双子模块的直流故障自清除能力,并具体分析计算了不对称双子模块的损耗。然后,针对不对称双子模块损耗高于半桥型模块化多电平换流器(MMC)的问题,提出不对称双子模块和半桥子模块组成的混合MMC系统结构,并给出了两类模块个数的配置原则。最后,利用MATLAB/Simulink仿真软件给出直流侧瞬时故障情况下混合MMC系统的仿真波形,验证了混合MMC系统的直流故障自清除能力。 Flexible DC transmission technology and the rapid development of energy Internet, greatly expanding the power electronic converter technology in the field of power transmission and distribution applications. Due to the transient failure of flexible DC transmission overhead lines, the structure of asymmetric twin sub-modules with DC fault self-cleaning capability is studied. Firstly, the topology, working principle and control method of asymmetric twin modules are described in detail. On this basis, the self - cleaning ability of the DC fault of the asymmetric twin - sub - module is analyzed in detail, and the loss of the asymmetric twin - module is calculated and analyzed. Then, aiming at the problem that the loss of asymmetric twin sub-module is higher than that of half-bridge modular multi-level converter (MMC), a hybrid MMC system composed of asymmetric twin sub-module and half bridge sub-module is proposed, The number of modules configuration principle. Finally, the simulation waveform of the hybrid MMC system is given by MATLAB / Simulink simulation software, and the DC fault self-cleaning ability of the hybrid MMC system is verified.