Analysis and hardware testing of cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters

Aboushady, Ahmed A.; Ahmed, Khaled; Jovcic, Dragan

doi:10.1049/cp.2015.0010

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…where from the R, L, C series circuit in Figure 8b, fault current in the time domain and the total voltage in the sub-module capacitor are calculated using Equations ( 8) and ( 9), respectively [38,39].…”

Section: Fault Analysis With the Proposed Designmentioning

confidence: 99%

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Kim

2021

Energies

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When integrating multi-grid renewable energy systems, modular multi-level converters (MMCs) are promising for high-voltage DC (HVDC) transmission. Because of the characteristics of the system, however, it is more difficult to prevent a fault at the DC terminal than at the AC terminal of the MMC. Accordingly, a fault ride-through (FRT) strategy for the operation of the MMC in the DC terminal is required for stable system operation. In this paper, a solution for closed-circuit overcurrent caused by a permanent line-to-line DC fault is proposed. This method is able to reduce the fault current through the adjustment of the slope of the total voltage in the system by operating a sub-module having lower switching losses and fewer passive devices compared with existing topologies. Additionally, through the equivalent circuit of the proposed scheme in a sub-module in case of a fault, the FRT mechanism for the fault current is explained. The feasibility of this proposed technique was verified through time-domain simulations implemented by Powersim, Inc.

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Section: Fault Analysis With the Proposed Designmentioning

confidence: 99%

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Kim

2021

Energies

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“…The equivalent discharging circuit diagram of the capacitors in the SMs in one phase can be seen as a RLC circuit [24]. Where,…”

Section: Fault Characteristic Analysismentioning

confidence: 99%

“…The i k ,f changes at the same frequency with the AC grid, and its maximum value depends on the limiting value of the outer‐loop controller. The I dcf changes very quickly, and it has a bigger influence on the i k ,uf

i_{k, uf} = \frac{1}{2} i_{k, f} + I_{dcf} k = a, b, c

The equivalent discharging circuit diagram of the capacitors in the SMs in one phase can be seen as a RLC circuit [24]. Where,

C_{eq} = false(2 C_{SM} / N false)

L_{eq} = 2 L_{b} + L_{s} + d \times l

R_{eq} = R_{f} + d \times r

.…”

Section: Zone Protection Strategymentioning

confidence: 99%

Zone partitioning protection strategy for DC systems incorporating offshore wind farm

Zhao

Shi

Yao

et al. 2017

IET Renewable Power Generation

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This study proposes a zone partitioning protection strategy for DC systems incorporating offshore wind farm. Regarding a DC system which consists of multiple local zones with radial topology, a multi-port DC hub is introduced to serve as firewall between different zones. By blocking the converter with DC fault blocking capability in the corresponding DC hub port, the fault can be prevented from spreading among zones. On the other hand, an inter-zone protection centre is designed and built in the DC hub to implement the continuous operation under the situation of any port outage. Furthermore, in every local zone, the hybrid DC circuit breaker is installed in each branch at the side near the star point in order to isolate the faulty branch quickly and selectively via installing the smoothing reactor at the other side to restrict the fault current. Especially, a zone protection centre is designed and built in the star point of each zone to implement the fault detection and fault isolation. A detailed model of the DC system with the proposed protection strategy is built under PSCAD/EMTDC TM environment. Simulation results under different operating conditions demonstrate the feasibility and validity of the proposed strategy.

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A Novel Hardware Protection Scheme for a Modular Multilevel Converter Half-Bridge Submodule

Tanta

Cunha

Monteiro

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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Analysis and hardware testing of cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters

Cited by 3 publications

References 7 publications

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Zone partitioning protection strategy for DC systems incorporating offshore wind farm

A Novel Hardware Protection Scheme for a Modular Multilevel Converter Half-Bridge Submodule

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