Multi-Timescale Stability of Modular Cascaded Power Electronic Systems

Project Details


By connecting multiple power electronic converter modules in series, the modular cascaded power electronic systems, also known as Modular Multilevel Converters (MMCs), are emerging as a promising technology for high-power conversion at high-voltage levels, i.e. from tens to hundreds of kilovolts. The modularity of the MMC provides the obvious advantages of scalability, redundancy, and high reliability, but it tends also to bring in oscillations at multiple time scales, owing to the dynamic interactions among the internal converter modules and with the external electric network. The nonlinear switching behavior of converter modules also cause cross frequency couplings between the DC and AC terminals of MMCs, which tend to give rise to multi-time-scale transient responses. This project, in collaboration with Ørsted Offshore Wind and ABB Power Grids Sweden, aims at developing an efficient analytical tool to understand the fundamental mechanism underlying the multi-time-scale dynamics of MMCs, and to further cope with the instabilities or resonances by means of smart control and hardware solutions.
Effective start/end date01/05/201730/04/2020

Research Output

  • 10 Journal article
  • 4 Article in proceeding

A Mode-Adaptive Power-Angle Control Method for Transient Stability Enhancement of Virtual Synchronous Generators

Wu, H. & Wang, X., Jun 2020, In : I E E E Journal of Emerging and Selected Topics in Power Electronics. 8, 2, p. 1034-1049 16 p., 9016216.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
  • 11 Downloads (Pure)

    Design-Oriented Transient Stability Analysis of PLL-Synchronized Voltage-Source Converters

    Wu, H. & Wang, X., Apr 2020, In : I E E E Transactions on Power Electronics. 35, 4, p. 3573-3589 17 p., 8820019.

    Research output: Contribution to journalJournal articleResearchpeer-review

    Open Access
  • 7 Citations (Scopus)
    15 Downloads (Pure)
    Open Access
  • 4 Citations (Scopus)