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

Transients of a grid-synchronized voltage source converter (VSC) are closelyrelated to over- currents and voltages occurred under large disturbances (e.g.a grid fault). Previous analysis in evaluating these transients usually neglectthe nonlinear control effects of a VSC (e.g. phase-locked-loop, PLL).Therefore, potential stability issues related with nonlinear dynamics cannot berevealed properly. This work aims to move further in this respect. To betteranalyze and gain more insights into the nonlinear properties, dynamicalanalysis of a grid-tied VSC is conducted by parts. Specifically, the nonlinearbehaviors of VSC power control loop (PCL) are firstly analyzed, in which thedynamics of PLL are assumed steady. Then, the nonlinear behaviors ofPLL-dominant dynamics are further explored in detail, where the PCL is assumedsteady. In this case, frequency instability and the mechanisms behind it arerevealed. At last, effects of PQ controller regulation as well as controllerbandwidth on the frequency stability are discussed. All the analysis andconclusions are verified by time domain simulations in PSCAD/EMTDC, where aswitching model of VSC is adopted.

Understanding the Nonlinear Behavior and Frequency Stability of a Grid-synchronized VSC Under Grid Voltage Dips