A Modular Multilevel DC/DC Converter With Fault Blocking Capability for HVDC Interconnects

Kish, Gregory J.; Ranjram, Mike K.; Lehn, Peter W.

doi:10.1109/tpel.2013.2295967

Cited by 234 publications

(144 citation statements)

References 41 publications

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“…It also increases the power loss since the current in each SM flows through two power devices instead of one as is the case with the HBSM. In order to decrease the number of the switches, a hybrid structure for an MMC that combines FBSMs and HBSMs has been introduced [11], [12]. The MMC is still able to block fault current and needs fewer semiconductor devices, which results in a lower power loss than that of an MMC based on FBSMs.…”

Section: Introductionmentioning

confidence: 99%

Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults

Nguyễn¹,

Lee²

2017

Journal of Power Electronics

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This paper deals with the blocking of DC-fault current during DC cable short-circuit conditions in HVDC (High-Voltage DC) transmission systems utilizing Modular Multilevel Converters (MMCs), where a new SubModule (SM) topology circuit for the MMC is proposed. In this SM circuit, an additional Insulated-Gate Bipolar Translator (IGBT) is required to be connected at the output terminal of a conventional SM with a half-bridge structure, hereafter referred to as HBSM, where the anti-parallel diodes of additional IGBTs are used to block current from the grid to the DC-link side. Compared with the existing MMCs based on full-bridge (FB) SMs, the hybrid topologies of HBSM and FBSM, and the clamp-double SMs, the proposed topology offers a lower cost and lower power loss while the fault current blocking capability in the DC short-circuit conditions is still provided. The effectiveness of the proposed topology has been validated by simulation results obtained from a 300-kV 300-MW HVDC transmission system and experimental results from a down-scaled HVDC system in the laboratory.

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Section: Introductionmentioning

confidence: 99%

Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults

Nguyễn¹,

Lee²

2017

Journal of Power Electronics

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“…In order to avoid the extreme duty cycle operation, multi-level converters are attractive candidates [27,28]. Three level bi-directional converters are proposed by introducing the three-level tank into the conventional bidirectional converters.…”

Section: Introductionmentioning

confidence: 99%

Non-isolated stacked bidirectional soft-switching DC-DC converter with PWM plus phase-shift control scheme

Jiang²,

Yang

et al. 2017

J. Mod. Power Syst. Clean Energy

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In this paper, a non-isolated stacked bidirectional DC-DC converter with zero-voltage-switching (ZVS) is introduced for the high step-up/step-down conversion systems. The extremely narrow turn-on and/or turn-off duty cycle existing in the conventional bidirectional buck-boost converters can be extended due to the stacked module configuration for large voltage conversion ratio applications. Furthermore, the switch voltage stress is halved because of the series connection of half bridge modules. The PWM plus phase-shift control strategy is employed, where the duty cycle is adopted to regulate the voltages between the input and output sides and the phaseshift angle is applied to achieve the power flow regulation.This decoupled control scheme can not only realize seamless bidirectional transition operation, but also achieve adaptive voltage balance for the power switches. In addition, ZVS soft-switching operation for all active switches is realized to minimize the switching losses. Finally, a prototype of 1 kW operating at 100 kHz is built and tested to demonstrate the effectiveness of the proposed converter and the control strategy.

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“…Back to back connection of two reduced converters leads to obtaining a DC-DC converter with transformer isolation. The so-called three-string architecture DC-MMC [13] and polyphase cascaded cell [14] are good examples of direct DC-DC conversion using MMC submodules. The so-called triangular MMC, a non-isolated DC-DC converter utilizing MMC submodules, is presented in [15].…”

Section: Introductionmentioning

confidence: 99%

Energy balancing in modular multilevel converter systems

Błaszczyk

Koska

Klimczak

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The modular multilevel converter (MMC) is a well-known solution for medium and high voltage high power converter systems. This paper deals with energy balancing of MMCs. The analysis includes multi-converter systems. In order to provide clear view, the MMC control system is divided into hierarchical levels. Details of control and balancing methods are discussed for each level separately. Finally, experimental results, based on multi-converter test setup, are presented.

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A Modular Multilevel DC/DC Converter With Fault Blocking Capability for HVDC Interconnects

Cited by 234 publications

References 41 publications

Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults

Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults

Non-isolated stacked bidirectional soft-switching DC-DC converter with PWM plus phase-shift control scheme

Energy balancing in modular multilevel converter systems

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