Fault-Tolerant Operation of a TLC-MMC Hybrid DC-DC Converter for Interconnection of MVDC and HVdc Grids

Cui, Shenghui; Hu, Jingxin; Doncker, Rik W. De

doi:10.1109/tpel.2019.2911853

Cited by 19 publications

(12 citation statements)

References 25 publications

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“…Further analysis has to be done on simultaneous multiple faults. [51,92,93,95,96] phase-shift adjustment interleaved converters yes no not applicable [99,100] bypass of faulty module input series output parallel no yes (1 per module) low [94,98] bypass of faulty module MMCs no no low [101] bypass of faulty module cascaded DC-DC converters no yes (atleast 5) high [106] inclusion of redundant components dual-switch buck converters no yes (1 per module) low [104,105] inclusion of redundant components series-resonant DC-DC converter no yes (4 per module) medium [92][93][94][95][96][97][98][99][100][101][102][103] inclusion of redundant components full bridge converters yes yes (3 per module) medium [44] inclusion of redundant components non-isolated multilevel converter yes yes (1 per module) low [39] inclusion of redundant components PSFB converter yes yes (2 per module) low [40,43] inclusion…”

Section: Discussionmentioning

confidence: 99%

“…An FTO scheme is proposed in [101] for the two-level converters-MMCs (TLC-MMC), which interconnects the medium-voltage DC (MVDC) and high voltage DC (HVDC) grids. A cost-effective FTO scheme by employing low-speed mechanical disconnectors is proposed in this paper.…”

Section: Bypass Of Faulty Modulesmentioning

confidence: 99%

“…To execute the bypass function, all the components are required which are originally included in the structure. Faulty modules bypassing in modular converters have few merits over reconfiguring approach: No changes in the original control scheme. Implementation cost is null. An FTO scheme is proposed in [101] for the two‐level converters‐MMCs (TLC‐MMC), which interconnects the medium‐voltage DC (MVDC) and high voltage DC (HVDC) grids. A cost‐effective FTO scheme by employing low‐speed mechanical disconnectors is proposed in this paper.…”

Section: Fault‐tolerant Strategiesmentioning

confidence: 99%

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Review on fault‐diagnosis and fault‐tolerance for DC–DC converters

Kumar

Elangovan

2020

IET Power Electronics

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The DC-DC converters operate extensively in a variety of industrial applications such as electric vehicles, renewable energy systems, aerospace applications, consumer electronics (smartphones, laptops, etc.) and energy storage solutions. The reliability of the DC-DC converters is of a greater significance. The research endeavours made in enhancing the reliability of the DC-DC converters are still very limited and dispersed. Due to the rapid growth in semiconductor technology, the DC-DC converters have an endless number of topologies, with various operating principles and functionalities. Enhancement of the reliability of all types of DC-DC converters is still a challenging task. Power switches are the most fragile components in converter circuits, which inherently fall prey to the faults occurring in the system. Hence, there is always a requirement to take appropriate remedial measures to deal with all kinds of faults. Further, in order to detect the occurrence of fault a fast faultdiagnosis and fault-tolerant strategies in the DC-DC converters is mandatory and the same has to be embedded in the converter for safety purpose. In view of the importance of the same, the fault-diagnostic algorithms and fault-tolerant strategies developed in the literature, by various researchers are furnished in a single document after conducting an exhaustive review.

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Section: Discussionmentioning

confidence: 99%

Section: Bypass Of Faulty Modulesmentioning

confidence: 99%

Section: Fault‐tolerant Strategiesmentioning

confidence: 99%

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Review on fault‐diagnosis and fault‐tolerance for DC–DC converters

Kumar

Elangovan

2020

IET Power Electronics

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“…Due to the developments of the solid-state power transformer (SSPT), medium-voltage dc (MVDC) micro-grids are used to integrate many types of renewable energy sources (RESs), charging stations, electrical vehicles (EVs), and local distribution generators (DGs). The MVDC grids are utilized for that purpose because of their many features such as high efficiency, high controllability, no reactive power, no synchronization problems, no requirements for the output regulation of frequency and voltage, and low cost [1,2]. With these renewable energy sources, the MVDC micro-grids became more desirable.…”

Section: Introductionmentioning

confidence: 99%

Efficient Protection Scheme Based on Y-Source Circuit Breaker in Bi-Directional Zones for MVDC Micro-Grids

Al-khafaf

Asumadu

2021

Inventions

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A new bi-directional circuit breaker is presented for medium-voltage dc (MVDC) systems. The Y-source impedance network topology is used to implement the breaker. The current transfer function is derived to show the frequency response and the breaker operation with the high frequencies. Mathematical analysis is achieved with different conditions of coupling among the breaker inductors. The minimum level of the magnetic coupling is determined, which is represented by the null condition. The effect of the turns-ratio on this condition is investigated as well. The breaker is designed with two types of fault conductance slope rates. The Y-source breaker is simulated, and the results verify the breaker operation during the fault condition and the load change. The results also demonstrate the effect of the coupling level on the minimum values of the source current when the fault occurs. Based on the expected fault type in the MVDC systems, the proposed breaker is developed to interrupt the overcurrent due to any of these fault types. A protection scheme is proposed for a 12-bus, two-level micro-grid, where the Y-source breakers are used in the bi-directional zones. The results verify the ability of the breaker to conduct and interrupt the current in both directions of the power flow.

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“…Interactions between the boost converter and disturbance rejection have been shown [30]. Bi-directional DC-DC high-efficiency interconnections in MVDC and HVDC converters have been discussed in combination with two-level MMCs [31][32][33]. Modeling of MVDC multidrive systems for power quality analysis and harmonic injection is discussed in [34].…”

Section: Introductionmentioning

confidence: 99%

Disturbance Rejection and Control Design of MVDC Converter with Evaluation of Power Loss and Efficiency Comparison of SiC and Si Based Power Devices

et al. 2020

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With direct current (DC) power generation from renewable sources, as well as the current relocation of loads from alternating current (AC) to DC, medium-voltage DC (MVDC) should fill gaps in the areas of distribution and transmission, thereby improving energy efficiency. The MVDC system is a platform that interconnects electric power generation renewables (solar, wind) with loads such as data centers, industrial facilities and electric vehicle (EV) charging stations (also using MVDC technology). DC–DC power converters are part of the rising technology for interconnecting future DC grids, providing good controllability, reliability and bi-directional power flow. The contribution of this work is a novel and efficient multi-port DC–DC converter topology having interconnections between two converters, three-level neutral point clamping (NPC) on the high-voltage (HV) side and two converters on the low-voltage (LV) side, providing two nominal low voltages of 400 V (constant) and 500 V (variable), respectively. The design of this new and effective control strategy on the LV side has taken into condition load disturbances, fluctuations and voltage dips. A double-closed-loop control topology is suggested, where an outside voltage control loop (in which the capacitance energies are analyzed as variable, and the inside current loop is decoupled without the precise value of boost inductance) is used. The simulation results show the effectiveness of the proposed control system. In the second part of this study, wide-bandgap SiC and Si devices are compared by using comprehensive mathematical modeling and LT-spice software. Improving power loss efficiency and overall cost comparisons are also discussed.

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Fault-Tolerant Operation of a TLC-MMC Hybrid DC-DC Converter for Interconnection of MVDC and HVdc Grids

Cited by 19 publications

References 25 publications

Review on fault‐diagnosis and fault‐tolerance for DC–DC converters

Review on fault‐diagnosis and fault‐tolerance for DC–DC converters

Efficient Protection Scheme Based on Y-Source Circuit Breaker in Bi-Directional Zones for MVDC Micro-Grids

Disturbance Rejection and Control Design of MVDC Converter with Evaluation of Power Loss and Efficiency Comparison of SiC and Si Based Power Devices

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