Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Cai, Hui; Zhang, Junli; Yu, Jingqiu; Zhang, Zheren

doi:10.3390/app11062882

Cited by 1 publication

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References 25 publications

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“…Based on the above models, the method proposed in [22] is easy to be extended to the calculation of the aforementioned transient magnitudes under a pole‐to‐ground fault. The fault currents and voltages before the insertion of the arrester modules can be obtained using the following equations:

{\begin{array}{l} A \cdot u = R \cdot i + L \cdot \frac{normald}{d t} i \\ \frac{d}{d t} u = C \cdot (- {boldA}^{boldT} \cdot i + {bold-italici}_{normals}) \end{array}

where, i is the matrix of the branch currents.…”

Section: Parameter Optimisation Of the Dccb With The Proposed Energy ...mentioning

confidence: 99%

Hybrid HVDC circuit breakers with an energy absorption branch of a parallel arrester structure

Zhang

et al. 2021

High Voltage

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Hybrid circuit breakers (CBs) are the most promising technology to isolate DC faults in modular multilevel converter (MMC)-based DC grids. However, they consist of expensive power electronic components that are sensitive to high overvoltage and overcurrent. This study proposes a hybrid high-voltage DC circuit breaker with an energy absorption branch of a parallel arrester structure, and investigates the possibility of reducing the fault current and the switching overvoltage. First, the basic principle of an energy absorption branch with a parallel arrester structure is presented. Then, the simultaneous and sequential insertion strategies are illustrated. Second, each strategy and each structure are combined separately to analyse their respective characteristics in reducing the overvoltage, the fault current, the energy absorption and the fault clearance time. The sequential insertion strategy of the proposed energy absorption branch is proved to have the best performance. Finally, the trade-offs between these four metrics are achieved through the non-dominated sorting genetic algorithm II (NSGA-II). A general method to determine the parameters of the proposed energy absorption branch from the Pareto front based on different preferences is provided. Simulations on PSCAD show that sequential insertion of the proposed energy absorption branch with the optimal parameters is able to suppress the switching overvoltage and limit the fault current to a relatively low extent simultaneously.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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{\begin{array}{l} A \cdot u = R \cdot i + L \cdot \frac{normald}{d t} i \\ \frac{d}{d t} u = C \cdot (- {boldA}^{boldT} \cdot i + {bold-italici}_{normals}) \end{array}

where, i is the matrix of the branch currents.…”

Section: Parameter Optimisation Of the Dccb With The Proposed Energy ...mentioning

confidence: 99%

Hybrid HVDC circuit breakers with an energy absorption branch of a parallel arrester structure

Zhang

et al. 2021

High Voltage

Self Cite

View full text Add to dashboard Cite

show abstract

Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Cited by 1 publication

References 25 publications

Hybrid HVDC circuit breakers with an energy absorption branch of a parallel arrester structure

Hybrid HVDC circuit breakers with an energy absorption branch of a parallel arrester structure

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