Protection of Nonpermanent Faults on DC Overhead Lines in MMC-Based HVDC Systems

Li, Xiaoqian; Song, Qiang; Liu, Wenhua; Rao, Hong; Xu, Shukai; Li, Licheng

doi:10.1109/tpwrd.2012.2226249

Cited by 358 publications

(189 citation statements)

References 18 publications

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“…Therefore replacing (8) in (10) and using the lower limit from (6) the maximal and minimal values for upper arm voltage under the lowest DC voltage are:…”

Section: Required Arm Voltage Ratingsmentioning

confidence: 99%

“…Successful HB submodule balancing demands that the arm current has positive and negative segments in each cycle. This implies that the peak of AC component in (34) must be larger than DC component: In steady state, the instantaneous dc power equals the AC power, and therefore using (8), (23) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Therefore, for a FB-MMC with design requirement V minpu ≥0.5k MMC , the N FB and N HB can be dimensioned according to (19) and (20). For the other design requirement -0.5k MMC <V minpu <0.5k MMC , to enable successful voltage balancing of the submodule voltages all the inserted submodules should be of FB type.…”

Section: A Minimal Number Of Fb Submodules For Successful Voltage Bamentioning

confidence: 99%

“…With the rapid development of MMC technology, MMC also becomes candidate for the over-head line transmission [6]- [8]. Because of very frequent DC faults on overhead lines, which are typically transient in nature, common HB MMC is not suitable.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Therefore replacing (8) in (10) and using the lower limit from (6) the maximal and minimal values for upper arm voltage under the lowest DC voltage are:…”

Section: Required Arm Voltage Ratingsmentioning

confidence: 99%

Section: A Minimal Number Of Fb Submodules For Successful Voltage Bamentioning

confidence: 99%

See 1 more Smart Citation

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)

View full text Add to dashboard Cite

show abstract

“…One of the main drawbacks is that the MMC employs a large number of IGBTs, thereby increasing the cost and scale of the converter. Another drawback that cannot be ignored is that the MMC that employs half-bridge SMs (HBSM-MMC) lacks DC fault-blocking capability [9,10]. When a pole-topole DC fault occurs, the arm currents and DC fault current of the HBSM-MMC increase at a very fast speed and might damage the freewheeling diodes.…”

Section: Introductionmentioning

confidence: 99%

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

Wei

Jiang

et al. 2017

J. Mod. Power Syst. Clean Energy

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This paper proposes a novel hybrid multilevel converter with DC fault-blocking capability, i.e., the neutral-point clamped hybrid multilevel converter (NHMC). By employing two types of unipolar full-bridge submodules along with director switches, which are composed of seriesconnected insulated-gate bipolar transistors, the NHMC combines the features and advantages of the neutral-point clamped converter and the modular multilevel converter. The basic topology, operating principles, modulation scheme, and energy-balancing scheme of the NHMC are presented. The DC fault-blocking capability of the NHMC is investigated. The number of power electronic devices used by the NHMC is calculated and compared with other multilevel converters, showing that the proposed NHMC can be an economical and feasible option for medium-voltage DC transmission with overhead lines. Simulation results demonstrate the features and operating scheme of the proposed NHMC.

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“…In addition to advantages of conventional two level VSCs, among the MMC main features are the possibility of continuously operating under unbalanced conditions, capability of surviving symmetrical and asymmetrical AC faults without increasing the risk of system collapse and possibility of complete DC fault isolation for some of its topologies [1][2][3]. DC fault management with MMCs has been a subject of recent vigorous research [4][5][6]. In MMCs, DC fault currents comprise two main components, AC side current inrush and cell capacitor discharge current.…”

Section: Introductionmentioning

confidence: 99%