Comparison of DC voltage Control Strategies for Multi-terminal HVDC Network during AC Faults

Malanda, Sindisiwe C.; Davidson, Innocent E.; Adam, Grain Philip

doi:10.1109/saupec/robmech/prasa48453.2020.9040990

Cited by 3 publications

(1 citation statement)

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“…The HVDC system is considered to be robust if it has both AC FRT capability and internal dynamics control. Numerous researchers have suggested alternative control and protection measures, including those in (Zhou et al, 2019;Luscan et al, 2020;Malanda, 2020;Shah et al, 2020;Cheng et al, 2021;Xin et al, 2021), for the HVDC system's ability to ride through an AC fault. The severe requirement of FRT for safe grid operation during faults with minimal power disruptions is the driving factor behind these problems.…”

Section: Comparison With Previous Researchmentioning

confidence: 99%

An MMC based HVDC system with optimized AC fault ride-through capability and enhanced circulating current suppression control

et al. 2023

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Modular multilevel converter (MMC) is a proven technology for HVDC applications due to its salient features such as modularity and excellent power quality. To ensure best possible grid support, recent grid codes require incorporating fault ride-through (FRT) strategies so that HVDC converter stations remain connected and maintain reliable operation under various symmetrical and asymmetrical AC faults. In this paper, a communication-free enhanced fault ride-through technique without the need of DC chopper has been proposed. The proposed FRT strategy ensures quick post fault recovery operation and can effectively manage DC link and capacitor voltages within safe limits. Along with proposed FRT strategy, in order to avoid high circulating current (CC) inside an MMC, this paper has proposed an optimal circulating current control approach based on proportional resonant and PI controllers in an abc reference frame. The suggested technique lowers the ripple in capacitor voltages while reducing the magnitude of the CC. Under both balanced and unbalanced ac grid conditions, the ripple in the dc link voltage is also reduced without the use of dual synchronous reference frame or any additional controllers. Simulation results confirm the effectiveness of the proposed FRT and CC suppression techniques for a 580-kV, 850-MW MMC-based HVDC system.

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