English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Impedance is an intuitive and efficient way for dynamic representation ofpower electronics devices. One of the evident strengths, when compared to othersmall-signal methods, is the natural association with circuit theory. Thismakes them possible to be connected through basic circuit laws. However,careful attention should be paid when making this association since theimpedances obtained through linearization are local variables, often referredto locally defined reference frames. To allow the operations of theseimpedances using basic circuit laws, a unified reference has to be defined.Though this issue was properly addressed on the state-space models, a thoroughanalysis and a clarification regarding the unified impedances and stabilityeffects are still missing. This paper aims to bridge this gap by introducingthe Impedance Operator (IO) and associated properties to the development ofimpedance networks. First, the IO for both the AC coupled and AC/DC coupledsystems are presented and verified through impedance measurements in PSCAD.Then, three types of impedance network-based stability criterions are presentedalong with a clarification on the consistency of stability conclusions.Finally, the Nyquist-based analysis is explored, regarding the sensitivity topartition points, to open the discussion on the identification of systems weakpoints.

Impedance Network of Interconnected Power Electronics Systems: Impedance Operator and Stability Criterion