Energy storable VSC-HVDC system based on modular multilevel converter

Guo, Jie; Zhou, Yuebin; Hu, Pengfei; Lin, Zhiwei; Liang, Yiqiao

doi:10.1016/j.ijepes.2015.11.074

Cited by 24 publications

(14 citation statements)

References 14 publications

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“…The profile of the voltage-error-dependent fault current if is defined as (5) and illustrated in Fig. 4 is over the lower threshold Verror1, if starts to increase.…”

Section: B Fast Fault Current Providing Control Of Wt Fecsmentioning

confidence: 99%

“…To reduce the cost related to offshore wind power integration, the diode rectifier unit based high voltage DC (DRU-HVDC) has recently received notable interests [1][2][3][4][5][6]. By replacing the voltage-source-converter (VSC) offshore station with diode rectifier, the transmission loss and the total cost can be potentially reduced by up to 20% and 30% respectively while the transmission capacity can be increased by a third [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…In [4], the developed control scheme is further tested during three-phase faults at the AC terminals of the onshore station and validates that the DRU-HVDC is robust to such AC faults. The low voltage ride-through (LVRT) capability of DRU-HVDC link is verified in [5]. Various fault cases, including DC faults, symmetrical onshore and offshore AC faults, are investigated in [6].…”

Section: Introductionmentioning

confidence: 99%

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DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

et al. 2018

2018 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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DC fault ride-through operations of the offshore wind farm connecting with diode rectifier unit (DRU) based HVDC link are presented in this paper. A voltage-error-dependent fault current injection is proposed to regulate the WT current during DC faults and to provide fault current. This contributes the control of the offshore AC voltage, which does not drop to zero but is remained relatively high to facilitate fast system recovery after clearance of a temporary DC fault. The WT converters operate on current limiting mode during DC faults and automatically restore normal operation after fault clearance. The full-bridge based modular multilevel converter (MMC) is adopted as the onshore station and its DC fault current control ability is explored to effectively suppress the fault current from the onshore station around zero, which reduces semiconductor losses and potential overcurrent risk of the MMC station. Simulation results confirm the robustness of the system to DC faults.Index Terms-DC fault protection, diode rectifier unit based HVDC (DRU-HVDC), full-bridge submodule, modular multilevel converter (MMC), offshore wind farm.I.

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“…The profile of the voltage-error-dependent fault current if is defined as (5) and illustrated in Fig. 4 is over the lower threshold Verror1, if starts to increase.…”

Section: B Fast Fault Current Providing Control Of Wt Fecsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

et al. 2018

2018 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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“…The multilevel converter can improve efficiency by enabling the use of components with better characteristics due to the reduced voltage stress, and has the advantage of lowering electromagnetic emissions by providing a staircase output voltage [1][2][3][4][5][6][7][8][9][10]. Thus, the use of a multilevel converter has increased in industrial and renewable energy applications, which require high-voltage and high output quality [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the use of a multilevel converter has increased in industrial and renewable energy applications, which require high-voltage and high output quality [11][12][13][14]. In recent times, studies of photovoltaic applications with multilevel topologies have made progress in increasing the efficiency and lowering the electromagnetic interference (EMI) and core losses [10][11][12][13][14][15][16][17]. The multi-level converter has been used mainly in renewable energy systems using high-voltage above kV, but researches are expanding to low-voltage applications to take advantage of the aforementioned merits [16,17].…”

Section: Introductionmentioning

confidence: 99%

Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter

Lee

Kim

2018

Electronics

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This paper presents the modeling and control-loop design method with an inverted decoupling scheme of a single-phase photovoltaic grid-connected five-level cascaded H-bridge multilevel inverter. For the unity power factor, the proportional and integral current controller with a duty ratio feed-forward compensation is used. In addition, in order to achieve the maximum power point tracking of each photovoltaic array, when the stacked modules are in the partial shading condition, each direct current (DC) voltage is stably controlled to their maximum power points (MPP) by dedicated voltage controllers of each H-bridge module. This paper also presents a control method that minimizes the effect of the loop-interaction in the design of an individual DC-link voltage control loop in a two-input two-output system. The proposed control methods of the cascaded H-bridge multilevel inverter are validated through the simulation and experimental results of the 2-kW prototype hardware.

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Research on the power distribution region and multiple constraint matching of modular multilevel converter

Liu

et al. 2021

Int Trans Electr Energ Syst

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Summary This paper focuses on the steady‐state power distribution region of the modular multilevel converter (MMC) and the matching among its multiple constraints. First, an equivalent model of the steady‐state MMC is established, and its basic power distribution region is solved based on analysis. Second, the influence of the AC current constraint, the AC outlet voltage constraint, the modulation index constraint, the DC current constraint, and the DC voltage constraint on the power distribution region are studied through the phasor analysis method. The power distribution region under the multiple constraints is obtained, and the parameters matching principle among these constraints are studied. Finally, in PSCAD/EMTDC, the simulation results validate the correctness of the obtained power distribution region and the effectiveness of the parameters matching principle among the multiple constraints.

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Energy storable VSC-HVDC system based on modular multilevel converter

Cited by 24 publications

References 14 publications

DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

DC Fault Protection of Diode Rectifier Unit Based HVDC System Connecting Offshore Wind Farms

Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter

Research on the power distribution region and multiple constraint matching of modular multilevel converter

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