Active Current-Limiting Control to Handle DC Line Fault of Overhead DC Grid

Zhou, Meng; Xiang, Wang; Zuo, Wenping; Lin, Weixing; Wen, Jinyu; Ren-gang, Yang; Ni, Binye

doi:10.23919/icpe2019-ecceasia42246.2019.8797284

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Voltage regulation and current limiting in this paper mainly mean that the voltage is regulated by control only, without the need for additional devices. Zhou et al , 2019 reduced the peak fault current by presetting the DC reference voltage of the hybrid MMC, but it did not consider the application on the half-bridge MMC. Ni et al , 2020a, 2020b-6, based on Zhou et al , 2019, proposed a current-limiting measure for an unlimited MMC topology.…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al , 2019 reduced the peak fault current by presetting the DC reference voltage of the hybrid MMC, but it did not consider the application on the half-bridge MMC. Ni et al , 2020a, 2020b-6, based on Zhou et al , 2019, proposed a current-limiting measure for an unlimited MMC topology. Fault current was suppressed by varying the number of SM put into the converter station and verifying the suitability of its control for high resistance faults.…”

Section: Introductionmentioning

confidence: 99%

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DC fault current-limiting method based on dual-loop active control for modular multilevel converters

Lijian

Zeng

2022

COMPEL

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Purpose In the event of a DC short-circuit fault in a flexible DC power grid, the high peak value of the fault current puts forward more stringent requirements on the DC circuit breaker. The existing fault current cutoff mainly focuses on changing the topology structure. To suppress the development of fault current and reduce the investment cost of the DC grid, this paper aims to propose a dual-loop active current-limiting control based on energy difference. Design/methodology/approach Firstly, the equivalent circuit at fault is established, and the parameters related to the fault current are analyzed. Then, the relationship between the output voltage change of the bridge arm and the difference between the AC and DC energy is deduced. Finally, the experimental results are discussed on the real-time simulation platform Opal-RT. Findings The proposed current-limiting measures can greatly reduce the fault current, reduce the breaking current of the circuit breaker and increase the capacitor voltage during the fault period, which is beneficial to the stability of the AC system. It is verified that the proposed method is also applicable to a certain high-resistance fault. Originality/value This paper applies the method of AC fault to DC fault and deduces the relationship between energy difference and voltage variation corresponding to different step lengths based on digital simulation. In addition, two variables are used as control structure parameters to reduce the probability of system misoperation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%