Precharging and DC Fault Ride-Through of Hybrid MMC-Based HVDC Systems

Zeng, Rong; Xu, Lie; Yao, Liangzhong; Morrow, D. John

doi:10.1109/tpwrd.2014.2360042

Cited by 159 publications

(97 citation statements)

References 19 publications

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“…As reviewed in [9], the technology of high voltage dc breakers has not been fully developed. Hence, the dc fault protection scheme is one of the major concerns with regard to MMC-based HVDC systems [5], [8], [10][11][12][13][14][15][16][17][18]. From the perspective of the converter, the MMC is expected to limit the fault current quickly without opening the ac breakers to protect the semiconductor devices and reserve the capacitor energies [5].…”

Section: Introductionmentioning

confidence: 99%

STATCOM Operation Scheme of the CDSM-MMC During a Pole-to-Pole DC Fault

Wei

Jiang

2016

IEEE Trans. Power Delivery

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In this paper, a static synchronous compensator (STATCOM) operation scheme of the modular multilevel converter adopting clamp double submodules (CDSM-MMC) during a pole-to-pole dc fault is proposed. By analyzing the current paths of a CDSM, this paper proposes three new operation states of the CDSM, which allow the CDSM to provide bipolar voltages when the arm current that flows through it is negative. Through control of the CDSMs to operate in these new states along with the blocked state, the arms of the CDSM-MMC can operate alternately in two different modes, that is, the conducting mode and blocked mode even when the dc-link voltage drops to zero. Thus the CDSM-MMC is capable of working as a STATCOM during a dc fault. Moreover, a control strategy of the dc -fault STATCOM operation mode is designed to control the reactive power provided by the CDSM-MMC, to limit the dc fault current, and to reserve and balance the energies stored in capacitors. Simulation results conducted in PSCAD/EMTDC demonstrate the validity of the proposed STATCOM operation scheme and control strategy of the CDSM-MMC during a pole-to-pole dc fault. Index Terms-Clamp double submodule (CDSM), modular multilevel converter (MMC), static synchronous compensator (STATCOM) operation, pole-to-pole dc fault, control strategy

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Section: Introductionmentioning

confidence: 99%

STATCOM Operation Scheme of the CDSM-MMC During a Pole-to-Pole DC Fault

Wei

Jiang

2016

IEEE Trans. Power Delivery

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“…In addition, both the hybrid MMC [29] and LCC used in the proposed hybrid HVDC system are naturally DC fault tolerant. Therefore, compared to conventional HBSM MMC based VSC-HVDC systems which can cause large disruption during a DC fault especially for multi-terminal HVDC networks, the hybrid HVDC can safely ride-through a transient DC fault without additional protection equipment, e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The hybrid MMC can be designed and operated similarly to a FBSM based MMC but with reduced power loss and cost. It can not only block DC side faults but also continue operating at reduced or even zero DC voltage [29]. With such advantages, the coordinated control for the hybrid HVDC system can be more flexible and the impact on the wind farm AC system during inverter commutation failure can be minimized.…”

Section: Alternative MMC Topology For the Hybrid Hvdc Systemmentioning

confidence: 99%

Hybrid HVDC for Integrating Wind Farms With Special Consideration on Commutation Failure

Zeng

Yao

et al. 2016

IEEE Trans. Power Delivery

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103

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This version is available at https://strathprints.strath.ac.uk/53537/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.This paper is a post-print of a paper submitted to and accepted for publication in IEEE Transaction on Power Delivery and is subject to Institution of Electrical and Electronic Engineering Copyright. The copy of record is available at IEEE Xplore Digital Library.1  Abstract-This paper presents the control and operation of a hybrid HVDC system comprising a wind farm side VSC rectifier and a grid side LCC inverter for integrating wind power. The configuration and operation principle of the hybrid HVDC system are described. Commutation failure in the LCC inverter during an AC network disturbance is considered and its impact on the hybrid system operation is analyzed. An enhanced control strategy for the LCC inverter at the grid side and an alternative MMC topology using mixed half-bridge and full-bridge modules considered for the rectifier at the wind farm side are proposed. Simulation results using Matlab/Simulink are presented to demonstrate the robust performance during LCC inverter commutation failure to validate the operation and recovery of the hybrid system with the proposed control strategy and MMC configuration.Index Terms-Commutation failure, hybrid HVDC, LCC, MMC, VSC, wind farm. I. INTRODUCTIONLarge wind farms both onshore (e.g. in China) and offshore (e.g. in Europe) have been developed with more being planned. Many of the large wind farms are located long distance away from the load centers or the available connection points. In cost-benefit terms, HVDC is likely to be preferable to HVAC technology for the main connection of large offshore wind farms when cable lengths exceed 80-120 km. For connecting large onshore remote wind farms using overhead lines, HVDC also provides significant benefits in terms of flexible control and improved system stability, and reduced cost for transmission distance over 600...

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“…Several topologies of DC fault tolerant MMC have been reported in the literature [9] - [18], such as the MMC using the clamp double submodules [9], the hybrid cascaded multilevel converter (HCMC) [10], the alternate arm converter [11], a series connected double sub-module [12], the cross-connected half-bridge submodules [13], the hybrid MMC with HB submodules at the DC side and FB submodules at the AC side [14]- [15], the MMC based on unipolar voltage full-bridge SM and three-level cross-connected SM [16], the MMC based on FB (full bridge) submodules [9], [17]- [18] and the MMC with mixed HB submodules and FB submodules [19]- [21]. Among all these DC fault tolerant MMCs, the MMC based on FB submodules (including the mixed submodules MMC) is the only commercially available fault tolerant technology for HVDC application.…”

Section: Introductionmentioning

confidence: 99%

“…Some recent researches have studied FB-MMC [17]- [21] but there is no analytical design method for important parameters of FB MMC, like the number of submodules or the number of FB submodules. Also generic FB MMC submodule balancing requirement has not been studied for the impact on converter parameters.…”

Section: Introductionmentioning

confidence: 99%

Full bridge MMC converter optimal design to HVDC operational requirements

Lin

Jovcic

Nguefeu

et al. 2016

2016 IEEE Power and Energy Society General Meeting (PESGM)

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Abstract-Design and operation of FB (full bridge) MMC that meets HVDC specifications are studied in this paper. Three new design parameters: the over-modulation index (k MMC ), the DC modulation index (M dc ), the minimal DC voltage (V minpu ) are introduced to specify the operation of a FB MMC. Power increase and semiconductor count increase with the increase of k MMC is analyzed to understand benefits of over-modulation. The required number of submodules and the number of more-costly FB submodules for specified rated dc voltage, V minpu and k MMC are calculated. The relationship of the submodule inserting logic and dynamics of an arm is analyzed. The submodule voltage balancing is studied and the constraints on the required number of FB submodules are deduced. The capability of over-modulation and the operation under low DC voltage with optimal submodule count are verified using EMTP simulation.

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Precharging and DC Fault Ride-Through of Hybrid MMC-Based HVDC Systems

Cited by 159 publications

References 19 publications

STATCOM Operation Scheme of the CDSM-MMC During a Pole-to-Pole DC Fault

STATCOM Operation Scheme of the CDSM-MMC During a Pole-to-Pole DC Fault

Hybrid HVDC for Integrating Wind Farms With Special Consideration on Commutation Failure

Full bridge MMC converter optimal design to HVDC operational requirements

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