Circulating current suppression control dynamics and impact on MMC converter dynamics

Author

Far, Ali Akbar Jamshidi ; Jovcic, Dragan

Author_Institution

Univ. of Aberdeen, Aberdeen, UK

fYear

2015

fDate

June 29 2015-July 2 2015

Firstpage

1

Lastpage

6

Abstract

This paper presents a study of circulating current suppression control (CCSC) dynamic of Modular Multilevel Converter (MMC). This study is based on a 10^th order linearized model composed of 6 states representing the basic dynamic of MMC and 4 states describing the dynamic of CCSC. The MMC dynamic states are zero sequence, basic frequency and second harmonics of maximal arm capacitor voltages in dq0 and d2q2 frames and zero sequence of differential current. The dynamics of the CCSC is stated by the second harmonic of differential current and CCSC outputs in d2q2 frame. It is illustrated by using root locus and time-domain responses, that CCSC control gains have notable impact on the overall MMC dynamics. It is also shown and verified that the CCSC control signals have direct impact on the power flow.

Keywords

electric current control; load flow; power capacitors; power conversion harmonics; time-domain analysis; CCSC control signals; MMC converter dynamics; circulating current suppression control dynamics; differential current; maximal arm capacitor voltages; modular multilevel converter; power flow; root locus; time-domain responses; Analytical models; Benchmark testing; Harmonic analysis; MATLAB; Mathematical model; PSCAD; Power system dynamics; Converters; Eigenvalue study; Power system dynamics; Power system stability;

fLanguage

English

Publisher

ieee

Conference_Titel

PowerTech, 2015 IEEE Eindhoven

Conference_Location

Eindhoven

Type

conf

DOI

10.1109/PTC.2015.7232762

Filename

7232762