A Cascaded Converter Interfacing Long-Distance HVdc and Back-to-Back HVdc Systems

Xiang, Wang; Ren-gang, Yang; Chang, Lin; Zhou, Jiapei; Wen, Jinyu; Lin, Weixing

doi:10.1109/jestpe.2019.2913915

Cited by 29 publications

(13 citation statements)

References 20 publications

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“…To address this challenge, the modular multilevel converter (MMC) with self-commutation capability is adopted at the inverter-side [5] [6]. Therefore, hybrid LCC-MMC HVDC systems combining the merits of both LCC and MMC are developed rapidly [7]. The hybrid HVDC systems can be classified into three types: (i) The pole-pole hybrid HVDC system with LCC and MMC installed in different poles.…”

Section: Variablesmentioning

confidence: 99%

“…For the cascaded LCC-MMC hybrid HVDC system, e.g., the Baihetan HVDC project, LCC and MMC are usually fed into two receiving AC systems with a certain electrical distance (interconnected by a tie line) to optimize the structure of the receiving power grid [7]. Thus, LCC and MMC are not only connected in series at the DC-side but also interact with each other at the AC-side, indicating that there is a complicated coupling between LCC and MMC.…”

Section: Variablesmentioning

confidence: 99%

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Impact of Strength and Proximity of Receiving AC Systems on Cascaded LCC-MMC Hybrid HVDC System

Xiang

et al. 2022

IEEE Trans. Power Delivery

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Section: Variablesmentioning

confidence: 99%

Section: Variablesmentioning

confidence: 99%

Impact of Strength and Proximity of Receiving AC Systems on Cascaded LCC-MMC Hybrid HVDC System

Xiang

et al. 2022

IEEE Trans. Power Delivery

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“…The fault clearance procedure of the MMC is the same as the one on the LV side, which will not be repeated. However, different from the LV side DC fault, the firing angle of LCC is increased similar to DC fault handling by the rectifier station in a conventional LCC HVDC system [23].…”

Section: DC Fault Protectionmentioning

confidence: 99%

Hybrid AC/DC hub for integrating onshore wind power and interconnecting onshore and offshore DC networks

Huang

Xiang

et al. 2020

IET Renewable Power Generation

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A hybrid AC/DC hub is proposed in this study, where a modular multilevel converter and a line-commutated converter are paralleled at the AC side to integrate onshore wind power, and connected in series at the DC sides to interconnect two DC networks with different voltages. The hybrid AC/DC hub facilitates wind power integration and DC network interconnection with reduced converter ratings and power losses when compared with the 'conventional' approach using DC-DC converters. To investigate the design requirement and performance of the hybrid AC/DC hub, power flow analysis is assessed to evaluate the converter power rating requirement. To ride through DC faults at either side of the interconnected DC networks, a coordinated DC fault protection for the hybrid AC/DC hub is proposed and studied. Simulation results in PSCAD/EMTDC verify the feasibility and effectiveness of the proposed control and protection of the hybrid AC/DC hub under power flow change, AC and DC fault conditions.

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“…Therefore, the MMCs with symmetrical bipolar cells are best fit to operate alongside line commutated converters (LCCs) in future transnational dc grids. [9], [10].…”

Section: Introduction Present Generations Of Multilevel Voltage Somentioning

confidence: 99%

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Vozikis

Adam

Rault³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper describes the operating principles and theoretical relationships that underpin the modelling and control system of the enhanced modular multilevel converter (EMMC). A full-scale model of a point-to-point HVdc link that employs EMMCs is used to examine its performance during normal operation in all four quadrants, and resiliency to symmetrical and asymmetrical ac and dc faults. Results of exhaustive simulation studies reveal that the improved ac and dc power qualities, which are achieved by incorporation of a few full-bridge cells into the arms of conventional half-bridge modular multilevel converter (HB-MMC) with medium-voltage cells to create the EMMC do not affect its ac and dc fault ride-through capability nor its dynamics during normal operation as active and reactive power set-points being varied. In addition, a variant of the EMMC is proposed, in which the number of full-bridge cells to be added into the arms of HB-MMC could be increased to offer bespoke features beyond that explicitly defined in original vision of the EMMC, such as reduced dc voltage operation during pole-toground dc fault, and potential extension of fault clearance times in multi-terminal HVdc grids. Moreover, the validity of the new variant has been confirmed using results obtained from highfidelity HVdc link models developed in EMPT-RV platform, in which the EMMCs are replaced by the proposed variant.

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A Cascaded Converter Interfacing Long-Distance HVdc and Back-to-Back HVdc Systems

Cited by 29 publications

References 20 publications

Impact of Strength and Proximity of Receiving AC Systems on Cascaded LCC-MMC Hybrid HVDC System

Impact of Strength and Proximity of Receiving AC Systems on Cascaded LCC-MMC Hybrid HVDC System

Hybrid AC/DC hub for integrating onshore wind power and interconnecting onshore and offshore DC networks

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

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