A global fault current limiting strategy for the MMC-HVDC grid with a reduced DC reactor

A global fault current limiting strategy for the MMC-HVDC grid with a reduced DC reactor
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减少直流电抗器的MMC-HVDC电网全局故障限流策略

DOI:
10.1016/j.ijepes.2022.108088
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发表时间:
2022
影响因子:
5.2
通讯作者:
Juan Zhou
Juan Zhou
中科院分区:
工程技术2区
文献类型:
--
作者:
Zheng Gong;Sihan Zhao;Xiaojie Wu;Changming Zheng;Juan Zhou

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在半桥模块化多电平换流器(HB-MMC)工程中,需要采用大电流限流电抗器和直流断路器隔离直流故障。为了限制故障电流,降低故障电流,本文提出了一种基于全局虚拟阻抗的故障电流限制(VIFCL)控制策略。该策略包括两部分:第一部分是简化的自适应故障限流控制,通过自适应地降低MMC的臂调制电压来限制直流故障电流。第二部分是虚拟阻抗控制,用于通过将虚拟阻抗映射到无功功率控制来限制MMC的AC电流和臂电流。在PSCAD/EMTDC中,采用四端HVDC电网验证了所提出的VIFCL控制策略的有效性。所提出的全局VIFCL控制可以限制DCCB的开断电流,降低开关量。所提出的策略有利于MMC安全地穿越直流故障,而不会对HVDC系统的功率恢复产生显著影响。
The large current limiting reactor (CLR) and DC circuit breaker (DCCB) are required in the half-bridge modular multilevel converter (HB-MMC) project to isolate the DC fault. To limit the fault current and reduce the CLR, a global virtual impedance-based fault current limiting (VIFCL) control strategy is proposed in this paper. This strategy includes two parts: the first part is a simplified adaptive fault current limiting control for limiting the DC fault current by reducing the arm modulating voltage of the MMC adaptively. The second part is a virtual impedance control for limiting the AC currents and the arm currents of the MMCs by mapping the virtual impedance to the reactive power control. The effectiveness of the proposed VIFCL control strategy is verified in the PSCAD/EMTDC using a four-terminal HVDC grid. The proposed global VIFCL control can limit the interrupted currents of the DCCBs and reduce the CLR. The proposed strategy is beneficial for the MMCs to ride through the DC faults safely without a significant influence on the power recovery of the HVDC system.
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