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首页> 外文会议>IEEE Conference on Energy Internet and Energy System Integration >Analysis of DC transmission line disconnection fault characteristics based on MMC-HVDC system under symmetrical monopole connection mode
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Analysis of DC transmission line disconnection fault characteristics based on MMC-HVDC system under symmetrical monopole connection mode

机译：基于对称单极连接模式下MMC-HVDC系统的直流输电线路断开故障特性分析

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摘要

DC transmission line disconnection fault is one of the common faults in DC side of MMC-HVDC system. Under the symmetrical monopole connection, the transmission line disconnection fault leads to the interruption of the power transmission of the flexible HVDC transmission system. During the period of transmission line disconnection fault, the submodule capacitor charges or discharges due to the function of the outer loop controller. The DC voltage of the faulty pole changes much comparing with the DC voltage of the healthy pole. The voltage of the two terminal AC side grounding reference point is no longer consistent, and the fault current with small amplitude but gradually increasing on the healthy pole DC line. There is a gradually increasing DC voltage offset component in the AC voltage of converter valve side. Finally, the validity and correctness of the transmission line disconnection fault analysis was verified by a two-terminal MMC-HVDC system which was established in PSCAD/EMTDC.
机译：直流输电线路断开故障是MMC-HVDC系统的直流侧的常见故障之一。在对称的单极连接下，传输线断开故障导致柔性HVDC传输系统的电力传输的中断。在传输线断开故障的时段期间，由于外环控制器的功能，子模块电容器电荷或放电。故障极的直流电压与健康杆的直流电压相比变化了很大。两个端子AC侧接地参考点的电压不再是一致的，并且在健康极直流线上具有小幅度但逐渐增加的故障电流。转换器阀侧的AC电压中存在逐渐增加的DC电压偏移分量。最后，通过在PSCAD / EMTDC中建立的双终端MMC-HVDC系统验证了传输线断开故障分析的有效性和正确性。

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