Year: 2025
Type: article
Abstract: This paper studies the design and small-signal stability analysis of active harmonic suppression (AHS) controllers in modular multilevel converter (MMC)-based high-voltage direct current (HVDC) systems. When compared to traditional twolevel voltage-source converters (VSCs), the increased effective switching frequency of MMCs makes active filtering feasible in high-voltage systems. A proof-of-concept is presented for an example AHS control structure working to suppress the harmonics in the MMC output current. Using a linear time-invariant (LTI) state-space MMC model based on the dynamic phasor (DP) theory, an eigenvalue-based stability assessment is carried out to study potential interactions between the active filtering action and regular MMC-HVDC controllers. The operation of the proposed AHS controller is demonstrated using time-domain simulations in MATLAB/Simulink, and guidelines are given for the design of AHS controllers in MMC-HVDC systems.
Authors: Özgür Can Sakinci, Jan Kircheis, Jef Beerten
Institution: KU Leuven
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4409427267