Novel Submodule Topology With Large Current Operation and DC-Fault Blocking Capability for MMC-HVDC

Meng, Yongqing; Zou, Yichao; Wang, Haibo; Kong, Ying; Zhang, Du; Wang, Xifan

doi:10.1109/tpwrd.2020.3011228

Cited by 25 publications

(7 citation statements)

References 25 publications

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“… Remarkable economic benefit. Hundreds or even thousands of IGBTs are needed to construct new topologies proposed in [8–10]. Moreover, The modulation system and control strategy must be adjusted accordingly.…”

Section: Discussionmentioning

confidence: 99%

“…As the most representative topologies which are capable of fault self-clearing, the fullbridge sub-module (FBSM) and the clamp double sub-module (CDSM) need a considerable quantity of insulated gate bipolar transistors (IGBT) [6,7]. Furthermore, enhanced reverse sub-module, double reverse blocking sub-module and parallel multiple sub-module are used to control capacitor charge and discharge to suppress fault current [8][9][10]. Fault current limiter (FCL) and new converter topologies have been lucubrated to limit the speed and peak value of the DC side fault current [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Novel adaptive reclosing scheme of MMC‐HVDC transmission lines based on phase synchronization compensation control

Zhang

Cui³

et al. 2022

IET Generation Trans & Dist

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Modular multilevel converter based on high voltage director current is important for large‐scale power regional interconnection. Adaptive reclosing is critical to improving the safety and economy of power transmission. The time‐frequency characteristics during fault clearance are analysed by Hilbert transform to suppress over‐voltage or over‐current resulting from short‐circuit fault. A phase synchronization compensation control algorithm is designed based on voltage and current through the virtual network. The rapid suppression of fault overvoltage is achieved by synchronously switching network attributes. Furthermore, the line recovery voltage is introduced into the fault property identification. The proposed adaptive reclosing scheme with high‐speed dynamics can raise the comprehensive benefits of the power system. Studies have verified that phase synchronization compensation control can effectively reduce the impact of oscillation. Moreover, permanent and transient faults can be quickly and reliably discriminated during de‐ionization by multi‐device coordination, which is earlier than the traditional adaptive reclosing scheme. It provides a basis for the fault recovery optimization strategy coordinating with multiple equipment.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel adaptive reclosing scheme of MMC‐HVDC transmission lines based on phase synchronization compensation control

Zhang

Cui³

et al. 2022

IET Generation Trans & Dist

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“…However, the mentioned above generator converter systems with high-frequency transformer are not suitable for offshore DC station to convert large-scale windfarm energy. Besides, some fault tolerance strategies are broadly developed for MMC and DAB to make system operate safely in [25][26][27][28][29], for their submodular faults might make the whole system break down. In [25], A hybrid series converter topology is proposed for HVDC that contains of a parallel and a series chain link per phase, to gain wide operation range and DC fault-tolerant capability.…”

Section: Introductionmentioning

confidence: 99%

Study on Distributed Power-Collection and Cascaded Boosting-Voltage Topology and Strategy for Offshore DC Station

et al. 2023

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Different from traditional concentrated power-collection and boosting-voltage (CPCB) topology adopted by HVDC station, this paper adopts a distributed power-collection and cascaded boostingvoltage (DPCB) topology for offshore DC station to collect DC power and boost DC voltage, which consists of multiple cascaded single active bridges (SABs). It has merits of strong DC-voltage boosting ability, low design difficulty and cost, and low system error rate. Three aspects are studied as follows. First, DPCB topology with its circuit equations is deduced step by step, and its operational mechanism is analysed under phase-shifting control method further. Second, PI control strategy is designed based on system small signal model, and system performance is analyzed by Bode diagram. Third, fault tolerance strategy with predicted power ratio is designed to keep DPCB station from breakdown when some SABs and generators are out of order, and enormous power difference occurs due to the factors of wind turbine location and windward. Finally, the feasibility and effectiveness of designed DPCB station with its strategy are verified by experiment results.

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“…Nevertheless, in DC grids, the DC short-circuit fault is a severe challenge MMC faces [6]. Because the typical half-bridge submodule (HBSM)-based MMC cannot deal with DC short-circuit fault [7], a variety of improvements have been proposed by researchers [8][9][10][11][12][13][14][15][16][17]. One of the existing improvements is adding a circuit breaker between the MMC and the power supply [8,9], and the other is modifying the submodule (SM) topology.…”

Section: Introductionmentioning

confidence: 99%

“…To minimise the number of required switching devices, a large number of dual-capacitor submodules (DCSMs) have appeared in the existing improved submodule topologies [10][11][12][13][15][16][17]. The representative SMs are the clamp double submodule (CDSM) [10], the series-connected double submodule (SDSM) [11], the T-type full-bridge submodule (TFBSM) [12], the cross-connected double submodule (CCDSM) [13], the simplified full-bridge double submodule (S-FBDSM) [15], the bidirectional switch clamp symmetrical submodule (BCSSM) [16] and the improved CDSM topology based on RB-IGBT (RBSM) [17]. When the MMC is running normally, each DCSM can be equivalent to two HBSMs connected in series.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical voltage balancing method for MMC based on DCSM

Zhao

et al. 2022

IET Power Electronics

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This paper presents a hierarchical voltage balance control method for a hybrid modular multi-level converter based on half-bridge submodule and dual-capacitor submodule. This voltage balancing method reduces the control complexity of the existing voltage balancing method of the central controller but does not significantly increase the control complexity of the submodule controller. In dual-capacitor submodule, only some logic operations are added. Furthermore, the proposed method reduces the hardware requirements and communication data between the submodule and central controllers. The reduced hardware requirements refer to the hardware circuits used to implement communication functions. The proposed method is also applicable to multi-level converter, which only includes half-bridge submodules, but requires two adjacent half-bridge submodules to use the same submodule controller. Simulation and experimental results validate the feasibility and effectiveness of the proposed hierarchical voltage balance control.

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Novel Submodule Topology With Large Current Operation and DC-Fault Blocking Capability for MMC-HVDC

Cited by 25 publications

References 25 publications

Novel adaptive reclosing scheme of MMC‐HVDC transmission lines based on phase synchronization compensation control

Novel adaptive reclosing scheme of MMC‐HVDC transmission lines based on phase synchronization compensation control

Study on Distributed Power-Collection and Cascaded Boosting-Voltage Topology and Strategy for Offshore DC Station

Hierarchical voltage balancing method for MMC based on DCSM

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