Robust and Generic Control of Full-Bridge Modular Multilevel Converter High-Voltage DC Transmission Systems
Robust and Generic Control of Full-Bridge Modular Multilevel Converter High-Voltage DC Transmission Systems
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DOI：
10.1109/tpwrd.2015.2394387
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发表时间：
2015-02
影响因子：
4.4
通讯作者：
G. Adam;I. Davidson
中科院分区：
文献类型：
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作者：
G. Adam;I. Davidson
本文提出了使全桥模块化多电平变换器（FB-MMC）的单元电容电压调节与直流电压无关的控制策略的理论基础。所提出的控制策略允许在永久性直流极对地故障期间降低直流电压运行，并允许在临时直流极对地故障清除后停机和重新启动期间控制HVDC链路的放电和充电。此外，它还允许基于电压源转换器（VSC）的HVDC链路使用FB-MMC在正、负直流负直流链路电压下运行。该特性非常适合混合HVDC网络，其中vsc与线路换向电流源转换器一起工作，而不会损害任何终端的功率反转。在考虑极对地和极对极直流故障的情况下，采用101单元/臂的FB-MMC的高压直流链路全尺寸模型上证明了所提出的控制策略的有效性。
This paper presents the theoretical basis of the control strategy that allows the cell capacitor voltage regulation of the full-bridge modular multilevel converter (FB-MMC) to be controlled independent of its dc-link voltage. The presented control strategy permits operation with reduced dc-link voltage during a permanent pole-to-ground dc fault, and controlled discharge and recharge of the HVDC links during shutdown and restart following clearance of temporary pole-to-pole dc faults. In addition, it allows voltage-source-converter (VSC)-based HVDC links that employ FB-MMC to operate with both positive and negative dc negative dc-link voltages. This feature is well suited for hybrid HVDC networks, where the VSCs operate alongside the line-commutating current source converters, without any compromise to the power reversal at any terminals. The usefulness of the presented control strategy is demonstrated on the full-scale model of the HVDC link that uses FB-MMC with 101 cells/arm, considering the cases of pole-to-ground and pole-to-pole dc faults.