Impact of strength and proximity of receiving AC systems on cascaded LCC-MMC hybrid HVDC system

Yongjie He, Wang Xiang, Binye Ni, Xiaojun Lu, Jinyu Wen

Research output: Contribution to journalArticlepeer-review

Abstract

The cascaded hybrid LCC-MMC inverter is considered as a feasible option to mitigate the commutation failure problem of conventional LCC-HVDC while maintaining bulk power transmission capability. However, the coupling between different types of converters may result in instability when the inverter integrates with weak AC systems. This paper establishes a small-signal model of the cascaded LCC-MMC inverter based hybrid HVDC system and validates the model against PSCAD/EMTDC. Through eigenvalue analysis, the impact of the strength and proximity of receiving AC systems on the small-signal stability is investigated, and the stable zone of the strength of receiving AC systems is identified. Besides, a supplementary coupling mitigation control is proposed to tackle the instability problem under weak AC systems integration. Both analytical results and time-domain simulations demonstrate the validity of the supplementary control.
Original languageEnglish
Number of pages13
JournalIEEE Transactions on Power Delivery
Early online date16 Apr 2021
DOIs
Publication statusE-pub ahead of print - 16 Apr 2021

Keywords

  • HVDC transmission
  • inverters
  • inductance
  • power system stability
  • hybrid power systems
  • renewable energy

Fingerprint

Dive into the research topics of 'Impact of strength and proximity of receiving AC systems on cascaded LCC-MMC hybrid HVDC system'. Together they form a unique fingerprint.

Cite this