Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission
Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission
复制标题
用于中压直流输电的具有直流故障闭锁能力的中性点钳位混合多电平变流器
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Ke Wang
中科院分区：
文献类型：
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作者：
Xinyu Yu;Yingdong Wei;Qirong Jiang;Xiaorong Xie;Yuquan Liu;Ke Wang
提出了一种具有直流故障阻断能力的新型混合多电平变换器，即中性点箝位混合多电平变换器（NHMC）。NHMC结合了中性点箝位变换器和模块化多电平变换器的特点和优点，采用两种单极全桥子模块以及由串联的绝缘栅双极晶体管组成的定向开关。介绍了NHMC的基本拓扑结构、工作原理、调制方案和能量平衡方案。研究了NHMC的直流故障阻断能力。计算了NHMC所使用的电力电子设备的数量，并与其他多电平变换器进行了比较，表明所提出的NHMC是一种经济可行的中压直流架空输电方案。仿真结果验证了所提出的NHMC的特点和运行方案。
This paper proposes a novel hybrid multilevel converter with DC fault-blocking capability, i.e., the neutral-point clamped hybrid multilevel converter (NHMC). By employing two types of unipolar full-bridge submodules along with director switches, which are composed of series-connected insulated-gate bipolar transistors, the NHMC combines the features and advantages of the neutral-point clamped converter and the modular multilevel converter. The basic topology, operating principles, modulation scheme, and energy-balancing scheme of the NHMC are presented. The DC fault-blocking capability of the NHMC is investigated. The number of power electronic devices used by the NHMC is calculated and compared with other multilevel converters, showing that the proposed NHMC can be an economical and feasible option for medium-voltage DC transmission with overhead lines. Simulation results demonstrate the features and operating scheme of the proposed NHMC.