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首页> 外文期刊>Electric power systems research >Boost inverter-based HVDC transmission system with inherent blocking capability of AC side contribution during DC side faults
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Boost inverter-based HVDC transmission system with inherent blocking capability of AC side contribution during DC side faults

机译：基于升压逆变器的高压直流输电系统，具有在直流侧故障时具有交流侧贡献的固有阻断能力

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摘要

Semiconductor advancements in the past three decades have positioned the voltage source converter-based HVDC (VSC-HVDC) solution as a practical and popular alternative to its line-commutated converter high voltage DC (LCC-HVDC) counterpart. The VSC-HVDC systems offer higher flexibility and system controllability features. One of the important challenges requiring careful investigation in such systems is the protection against DC side faults. Unfortunately, the VSC is inherently defenseless against such faults (DC link short circuit or DC cable short circuit). This paper proposes an HVDC system topology, namely, the boost inverter-based HVDC system (BI-HVDC), which provides complete blocking capability between the AC grid and the DC side fault. This blocking capability limits the DC fault current level to the DC capacitor discharge current. Ratings and characteristics of the proposed system compared to other existing topologies are highlighted in this work. A simulation study is conducted to check the performance of the proposed system during normal as well as abnormal operating conditions. A comparison between the performance of the conventional 2-level VSC-HVDC and the proposed system during DC side faults is also presented. The simulation results elucidate a significant decrease in the DC fault current due to the blocking capability of the BI-HVDC system during DC side faults.
机译：在过去的三十年中，半导体技术的进步已将基于电压源转换器的HVDC（VSC-HVDC）解决方案定位为与其线路换向转换器高压DC（LCC-HVDC）同类产品相比实用且流行的替代方案。 VSC-HVDC系统具有更高的灵活性和系统可控性。在此类系统中需要仔细研究的重要挑战之一是如何防止直流侧故障。不幸的是，VSC本质上无法防御此类故障（直流链路短路或直流电缆短路）。本文提出了一种高压直流输电系统拓扑，即基于升压逆变器的高压直流输电系统（BI-HVDC），该系统在交流电网和直流侧故障之间提供了完全的阻断能力。这种阻断能力将直流故障电流水平限制为直流电容器放电电流。在这项工作中，与其他现有拓扑相比，该系统的额定值和特性得到了强调。进行了仿真研究，以检查所提议系统在正常和异常运行条件下的性能。还介绍了常规2级VSC-HVDC与所建议系统在直流侧故障期间的性能之间的比较。仿真结果说明，由于BI-HVDC系统在直流侧故障期间的阻断能力，直流故障电流显着降低。

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