Research on fault characteristics and protection strategy of LCC-VSC cascade hybrid HVDC system on receiving end

Xu, Y.; Lu, Y.; Jiang, C.; Tang, J.; Zhao, Z.; Zou, T.; Wang, Y.; Wang, L.

doi:10.1049/icp.2022.1268

Cited by 2 publications

(1 citation statement)

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“…Most previous studies on internal HVDC system faults were conducted on MMC-HVDC: when a short-circuit fault occurs in its DC line, the submodule capacitor discharge and other circumstances will cause a rapid fault-surge current; thus, a reasonable solution for the fault current is needed to provide a basis for the electric design of submodule components in MMC-HVDC (Wang et al, 2011;Wang et al, 2011). When a fault occurs in the DC line of a hybrid cascaded HVDC system, the inverter-side LCC uses its back-blocking characteristics to isolate the fault current fed from the inverter side to the fault point, thus greatly reducing the impact on the HVDC system (Li et al, 2022;Xu et al, 2022). The Comparison of existing contributions and this paper is shown in Table 1.…”

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confidence: 99%

Study on the characteristic of the grounding fault on the cascaded midpoint side of the hybrid cascaded HVDC system

et al. 2023

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The hybrid cascaded high-voltage direct current (HVDC) system combines the system support capabilities of the modular multilevel converter (MMC) with the capacity of the line-mutated converter’s (LCC’s) advantage of high-power transmission. The HVDC system is among the key elements of a smart grid where artificial intelligence is applied extensively. However, the characteristics of a grounding fault on the cascaded midpoint side of a hybrid cascaded HVDC system remain unclear. This study analyzes fault characteristics and the impact of faults using analytical methods. First, the topology and basic control strategy are presented. The fault response process is then analyzed by dividing systems into the MMC and LCC parts at the inverter side. A separate theoretical analysis is also conducted. In addition, the impacts of faults on HVDC and alternating current (AC) networks are analyzed. Therefore, even after the HVDC system is disabled, the AC network can supply fault currents using an antiparallel diode. The simulation results show that the proposed analysis method is feasible, and the theoretical analysis is correct. The proposed method can provide a theoretical basis for the selection of equipment for HVDC systems and smart grid construction.

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