Rotor Angle Stability of Hybrid AC/DC Power Grids

Lasantha Meegahapola, Siqi Bu, Mingchen Gu

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review


The utilisation of HVDC transmission has brought complex dynamics to the conventional AC power grids dominated by the synchronous generator. Rotor angle stability, as one of the major dynamic concerns, has been considerably affected by the frequent interactions with different HVDC systems. This chapter provides a comprehensive overview on the concepts, and main features and causes of two rotor angle stability issues. Transient stability of hybrid AC/DC networks is investigated by introducing fundamental concepts associated with transient stability evaluation. Subsequently, how the transient stability phenomenon affected by hybrid AC/DC power networks is exemplified with exemplar case studies. The small-signal modelling (i.e., linearised state-space model) of the hybrid AC/DC power grids covering both LCC and VSC based HVDC systems and relevant control schemes is introduced. The general small-disturbance stability analysis concerning the critical oscillation and damping mechanism as affected by HVDC systems is presented by using the eigenvalue analysis and eigenvalue sensitivity analysis with respect to some key system parameters. The influence of LCC and VSC based HVDC systems on the synchronising and damping torque of the synchronous generator is studied. Time domain simulations of hybrid AC/DC power grids are also provided for validation purposes in this chapter.

Original languageEnglish
Title of host publicationPower Systems
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages41
Publication statusPublished - Aug 2022

Publication series

NamePower Systems
ISSN (Print)1612-1287
ISSN (Electronic)1860-4676

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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