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Autonomous synchronizing and frequency response control of multi-terminal DC systems with wind farm integration

Yang, Renxin, Shi, Gang, Cai, Xu, Zhang, Chen, Li, Gen and Liang, Jun 2020. Autonomous synchronizing and frequency response control of multi-terminal DC systems with wind farm integration. IEEE Transactions on Sustainable Energy , -. 10.1109/TSTE.2020.2964145

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Abstract

Recent analyses have shown that the grid-integration of offshore wind farms through MTDC systems has brought low inertia and small-signal stability issues, in which the dynamics of phase-locked-loop (PLL) play a crucial role. To address this issue, this paper proposes a control strategy for the multi-terminal VSCs aiming at PLL-less synchronization and autonomous frequency response of the MTDC system. One of the significant features of the proposed control is that the deviation of the grid frequency can be instantaneously reflected on the deviation of the DC voltage without ancillary control. Based on this feature, a fast inertia response and primary frequency regulation among wind farms and AC systems interconnected by the MTDC system can be achieved. A small-signal model is established to evaluate the overall system stability using the proposed control. Finally, comparative studies of this proposed control with the conventional PLL-based vector control are conducted in PSCAD/EMTDC based on a practical MTDC system in China, the Zhangbei four-terminal HVDC transmission system. The analysis shows that the proposed control exhibits advantages in weak grid operation and autonomous frequency response

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Engineering
ISSN: 1949-3029
Date of First Compliant Deposit: 6 January 2020
Date of Acceptance: 1 January 2020
Last Modified: 08 Jan 2020 15:15
URI: http://orca.cf.ac.uk/id/eprint/128249

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