2018
DOI: 10.1109/tpwrs.2017.2691737
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Modeling and Damping Control of Modular Multilevel Converter Based DC Grid

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Cited by 93 publications
(54 citation statements)
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“…With the increased need for renewable energy utilization and resource optimization, the modular multilevel converter (MMC) based DC grid has been a competitive candidate to integrate bulk renewable energy over long distance [1]- [3]. Different to the two-terminal HVDC systems, in a DC grid, multiple converters will feed fault currents to the faulted lines during DC faults, leading to high over-currents [4].…”
Section: Introductionmentioning
confidence: 99%
“…With the increased need for renewable energy utilization and resource optimization, the modular multilevel converter (MMC) based DC grid has been a competitive candidate to integrate bulk renewable energy over long distance [1]- [3]. Different to the two-terminal HVDC systems, in a DC grid, multiple converters will feed fault currents to the faulted lines during DC faults, leading to high over-currents [4].…”
Section: Introductionmentioning
confidence: 99%
“…To increase the maximum transmission power, the DC side oscillation must be suppressed. The suppression methods of DC side oscillation can be classified into passive methods [20,21] and active methods [22][23][24][25][26][27][28][29]. Passive methods suppress resonance by introducing a passive damper branch into the circuit to remodel the impedance of the source converter or load converter in a cascaded system.…”
Section: Introductionmentioning
confidence: 99%
“…Active methods suppress resonance by introducing voltage and current feedback control in a controller to improve the impedance of the source converter or load converter. Virtual impedance is widely used in control systems as an active damping control method [24][25][26][27][28][29]. It can be introduced to suppress DC-side oscillation [24,25], to limit output current for voltage controlled inverters during overloads or faults [26,27], to improve the stability of a grid-connected inverter by change its input admittance [28], and to enhance the small-signal stability of a modular multilevel converter (MMC) based DC grid [29].…”
Section: Introductionmentioning
confidence: 99%
“…The virtual impedance can improve the impedance characteristic of the converter and increase the degree of freedom of the converter control system [11][12][13], and is mainly used for active damping oscillations [14], power flow control [15], harmonic compensation [16], and enhancement of fault ride-through capability [17]. In this paper, the virtual impedance is used to suppress the DC oscillation in a VSC-HVDC system and the parameters of the virtual impedance are obtained from the impedance characteristics analysis of the converter station.…”
Section: Introductionmentioning
confidence: 99%