基于不对称双子模块的混合MMC及其直流故障自清除能力

发布时间：2018-10-08 15:09

【摘要】：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。
[Abstract]:With the rapid development of flexible DC transmission technology and energy internet, the application of power electronic converter technology in power system transmission and distribution field has been greatly expanded. Because transient faults often occur in flexible HVDC overhead transmission lines, an asymmetric two-module structure with self-clearing capability of DC faults is studied. Firstly, the topology, working principle and control method of asymmetrical twin modules are described in detail. On this basis, the DC fault self-clearing ability of asymmetrical twin modules is analyzed in detail, and the loss of asymmetric twin modules is analyzed and calculated in detail. Then, aiming at the problem that the loss of asymmetrical two-submodules is higher than that of half-bridge modular multilevel converters, a hybrid MMC system structure composed of asymmetric two-submodules and half-bridge sub-modules is proposed, and the configuration principle of the number of two kinds of modules is given. Finally, the simulation waveform of hybrid MMC system under the condition of DC side transient fault is given by using MATLAB/Simulink simulation software, and the self-clearing ability of hybrid MMC system is verified.
【作者单位】：上海交通大学电子信息与电气工程学院;
【基金】：国家重点研发计划资助项目(2016YFB0900201)~~
【分类号】：TM46;TM721.1

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