A Review on Controller Scalability for VSC-MTDC Grids: Challenges and Applications

Garg, Lokesh; Prasad, Sheetla

doi:10.1080/23080477.2022.2045787

Cited by 5 publications

(1 citation statement)

References 58 publications

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“…phase-angle and frequency of the AC voltage. VSCs controlled with pulse width modulation can decrease harmonic content and offer faster response times [2]- [4]. Due to high change in current and absence of zero DC current during the DC fault, fault control and regulation of the DC distribution systems becomes a serious problem using VSCs in distribution grids [5].…”

Section: Introductionmentioning

confidence: 99%

Control Design and Fault Handling Performance of MMC for MMC-Based DC Distribution System

et al. 2022

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Modular multilevel converters (MMCs) have emerged as a viable choice in future DC grid architectures due to their scalability to meet voltage level requirements. However, MMC-based DC distribution systems are at risk of short-term outages during the faults in either the DC or AC networks feeding the MMC, so it remains a challenge to accomplish AC and DC fault ride-through (FRT) capability in such applications. To ensure stable operations of the DC terminals, FRT strategies are required for the faults on both the AC and DC sides of the converter. This paper proposes a FRT strategy for the AC and DC side of the converter to ensure stable and economically viable operation of the DC distribution network. The asymmetrical faults in the upstream AC grids are managed by using the integrated energy of the MMC. Whereas, the DC FRT capability of the MMC is accomplished by changing the redundant submodules of the MMC to full-bridge submodules (FBSMs), thus allowing a DC FRT to be achieved by using DC circuit breakers that are low cost and reduced in size. Applying the proposed DC FRT strategy, which makes possible the use of low-cost and reduced in size DC circuit breakers in DC distribution, results in a reduction in the overall initial investments.INDEX TERMS Modular multilevel converter, DC FRT, Asymmetrical fault in AC grid, DC faults.

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Section: Introductionmentioning

confidence: 99%