Internal energy based grid-forming control for MMC-HVDC systems with wind farm integration

Yang, Renxin, Shi, Gang, Cai, Xu, Zhang, Chen and Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493 2022. Internal energy based grid-forming control for MMC-HVDC systems with wind farm integration. Presented at: 12th International Energy Conversion Congress and Exposition (ECCE Asia 2021), Virtual, 24-27 May 2021. IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia). IEEE, 10.1109/ECCE-Asia49820.2021.9479038

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Abstract

The virtual synchronous control is regarded as an effective solution for grid-tied converters to operate under weak grid conditions and provide inertia support. However, for those grid-tied converters which control the DC voltage, e.g., the receiving end converter (REC) in modular multilevel converter based high-voltage direct-current (MMC-HVDC) transmission systems with wind farm integration, the application of virtual synchronous control is difficult due to the cascade control loops. The dynamic performance of DC voltage control may also be degraded. To address these issues, a novel grid-forming control strategy with real-time inertia support and fast DC voltage control is proposed for the REC. The cascade control loops of the virtual synchronous control are simplified by utilizing the internal energy stored in sub-module capacitors to emulate synchronous generator rotors. Moreover, the DC voltage is decoupled with the submodule capacitors voltage, thus being robust to sudden power change. Simulation results in PSCAD/EMTDC show that the proposed control realizes fast inertia support and desired dynamic control of the DC voltage, especially in weak grid operation.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	IEEE
ISBN:	9781728163444
Date of First Compliant Deposit:	17 May 2021
Date of Acceptance:	1 March 2021
Last Modified:	11 Mar 2023 02:57
URI:	https://orca.cardiff.ac.uk/id/eprint/141399

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