An enhanced MMC topology with DC fault ride-through capability

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

doi:10.1109/iecon.2013.6700152

Cited by 80 publications

(31 citation statements)

References 17 publications

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“…Commonly used half-bridge cells do not have dc side fault blocking capability, which complicates the development of large multi-terminal dc-grids [3]. In this regard, new cell topologies have been proposed, such as full-bridge cells or diode-clamp SubModules (SMs) [4], [5]. Other converter topologies have also been proposed to limit short-circuit currents [6], [7].…”

Section: Igh-voltage DC (Hvdc) Links With Linementioning

confidence: 99%

Analysis of the Performance of MMC Under Fault Conditions in HVDC-Based Offshore Wind Farms

Vidal-Albalate

Beltrán

Rolán

et al. 2016

IEEE Trans. Power Delivery

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Abstract-This work analyzes the behavior of an MMC-HVDC-connected off-shore wind power plant (WPP) during dc faults. For that purpose, detailed models of the dc cable, MMC stations and transformers have been used in order to obtain reliable results. The influence of the WPP control method in the short-circuit behavior of the HVDC link has also been studied. Results show that the dynamics of the WPP contribution to pole-to-ground faults are slightly slower than those of the wind turbines current control loops. Therefore, the wind turbine front end converters can be used to reduce the peak and average value of the fault current in such a system. Moreover, it has been found that ferro-resonant oscillations can appear in the off-shore ac-grid when the WPP delivers constant power during faults.

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Section: Igh-voltage DC (Hvdc) Links With Linementioning

confidence: 99%

Analysis of the Performance of MMC Under Fault Conditions in HVDC-Based Offshore Wind Farms

Vidal-Albalate

Beltrán

Rolán

et al. 2016

IEEE Trans. Power Delivery

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“…Among them, the subscripts p and n represent upper arm and lower arm respectively, and o is the neutral point. Reference direction is as shown in Figure 1 [19]. As shown in Figure 1, according to Kirchhoff current theory,…”

Section: Influence Of Ac Transient Faults On MMCmentioning

confidence: 99%

“…Therefore, z-transform of filter banks is expressed as follows. (19) where, G(z) is z-transform of high-pass filter, H(z) is z-transform of low-pass filter. For convenience, Equation (19) is transformed into recurrence relation as follows.…”

Section: Contrastanalysisof Rwpe and Swpementioning

confidence: 99%

A Transient Fault Recognition Method for an AC-DC Hybrid Transmission System Based on MMC Information Fusion

Chen

Dou

et al. 2016

Energies

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At present, the research is still in the primary stage in the process of fault disturbance energy transfer in the multilevel modular converter based high voltage direct current (HVDC-MMC). An urgent problem is how to extract and analyze the fault features hidden in MMC electrical information in further studies on the HVDC system. Aiming at the above, this article analyzes the influence of AC transient disturbance on electrical signals of MMC. At the same time, it is found that the energy distribution of electrical signals in MMC is different for different arms in the same frequency bands after the discrete wavelet packet transformation (DWPT). Renyi wavelet packet energy entropy (RWPEE) and Renyi wavelet packet time entropy (RWPTE) are proposed and applied to AC transient fault feature extraction from electrical signals in MMC. Using the feature extraction results of Renyi wavelet packet entropy (RWPE), a novel recognition method is put forward to recognize AC transient faults using the information fusion technology. Theoretical analysis and experimental results show that the proposed method is available to recognize transient AC faults.

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“…The modulation and control strategies [19] of a new hybrid VSC with DC fault-tolerant capability called hybrid cascaded multilevel converter (HCMC) [18] are further studied. A new sub-module structure was also proposed [20]. A common disadvantage of these topologies is the need for massive power electronic devices that lead to higher costs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Hybrid HVDC System with DC Fault Ride-Through and Commutation Failure Mitigation Capability

Guo¹,

Zhao²,

Peng³

et al. 2015

Journal of Power Electronics

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A hybrid HVDC system that is composed of line commutated converter (LCC) at the rectifier side and voltage source converter (VSC) in series with LCC at the inverter side is studied in this paper. The start-up strategy, DC fault ride-through capability, and fault recovery strategy for the hybrid HVDC system are proposed. The steady state and dynamic performances under start-up, AC fault, and DC fault scenarios are analyzed based on a bipolar hybrid HVDC system. Furthermore, the immunity of the LCC inverter in hybrid HVDC to commutation failure is investigated. The simulation results in PSCAD/EMTDC show that the hybrid HVDC system exhibits favorable steady state and dynamic performances, in particular, low susceptibility to commutation failure, excellent DC fault ride-through, and fast fault recovery capability. Results also indicate that the hybrid HVDC system can be a good alternative for large-capacity power transmission over a long distance by overhead line.

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An enhanced MMC topology with DC fault ride-through capability

Cited by 80 publications

References 17 publications

Analysis of the Performance of MMC Under Fault Conditions in HVDC-Based Offshore Wind Farms

Analysis of the Performance of MMC Under Fault Conditions in HVDC-Based Offshore Wind Farms

A Transient Fault Recognition Method for an AC-DC Hybrid Transmission System Based on MMC Information Fusion

Investigation of a Hybrid HVDC System with DC Fault Ride-Through and Commutation Failure Mitigation Capability

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