Control of Modular Multilevel Converter Based on Stationary Frame under Unbalanced AC System

Author

Yuebin, Zhou ; Daozhuo, Jiang ; Jie, Guo ; Pengfei, Hu ; Zhiyong, Lin

Author_Institution

Zhejiang Univ., Hangzhou, China

fYear

2012

fDate

July 31 2012-Aug. 2 2012

Firstpage

293

Lastpage

296

Abstract

The equivalent circuit of modular multilevel converter (MMC) is divided into ac-loop and dc-loop. The ac-loop is used to regulate the power exchanged between AC system and MMC, whereas the dc-loop can be used to regulate the internal performance of MMC. In order to fulfill the power control a controller based on proportional resonant (PR) scheme in stationary αβ-frame is designed. A controller based on PR scheme in stationary abc-frame is designed to improve the internal performance of MMC. The proposed controller works well under both balanced and unbalanced AC system. Finally, a simulation model with 71 levels is built to verify the proposed controller.

Keywords

control system synthesis; equivalent circuits; power control; power convertors; proportional control; resonant power convertors; AC-loop division; DC-loop division; MMC; PR controller scheme; balanced AC system; controller design; equivalent circuit; internal performance regulation; modular multilevel converter; power control; power exchange regulation; proportional resonant controller scheme; stationary αβ-frame design; stationary frame; unbalanced AC system; Capacitors; Harmonic analysis; Mathematical model; Power harmonic filters; Reactive power; Steady-state; Voltage control; Modular multilevel converter; ac-loop; circulating current; dc-loop; stationary frame;

fLanguage

English

Publisher

ieee

Conference_Titel

Digital Manufacturing and Automation (ICDMA), 2012 Third International Conference on

Conference_Location

GuiLin

Print_ISBN

978-1-4673-2217-1

Type

conf

DOI

10.1109/ICDMA.2012.71

Filename

6298311