An Application of Proportional-Resonant Controller in MMC-HVDC System under Unbalanced Voltage Conditions

Title & Authors
An Application of Proportional-Resonant Controller in MMC-HVDC System under Unbalanced Voltage Conditions
Quach, Ngoc-Thinh; Ko, Ji-Han; Kim, Dong-Wan; Kim, Eel-Hwan;

Abstract
This paper presents an application of proportional-resonant (PR) current controllers in modular multilevel converter-high voltage direct current (MMC-HVDC) system under unbalanced voltage conditions. The ac currents are transformed and controlled in the stationary reference frame ($\small{{\alpha}{\beta}}$-frame). Thus, the complex analysis of the positive and negative sequence components in the synchronous rotating reference frame (dq-frame) is not necessary. With this control method, the ac currents are kept balanced and the dc-link voltage is constant under the unbalanced voltage fault conditions. The simulation results based on a detailed PSCAD/EMTDC model confirm the effectiveness of the proposed control method.
Keywords
Integral-proportional controller;Modular multilevel converter-high voltage direct current system;Negative sequence component;Proportional-resonant controller;Unbalanced voltage conditions;
Language
English
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