TY - JOUR
T1 - Harmonic Stability Analysis of MMC-Based DC System Using DC Impedance Model
AU - Ji, Ke
AU - Tang, Guangfu
AU - Yang, Jie
AU - Li, Yunfeng
AU - Liu, Dong
N1 - Publisher Copyright:
© 2013 IEEE.
PY - 2020/6
Y1 - 2020/6
N2 - The dc impedance model of a modular multilevel converter (MMC) is the basis for analyzing harmonic resonances of MMC-based dc systems. As an MMC typifies a multiple harmonic response system, its internal dynamics and controls significantly influence its external characteristics. In this paper, a dc impedance model of an MMC is developed by harmonic transfer function method that considers the internal dynamics and typical controls of MMCs. The internal dynamics mainly include capacitor voltage fluctuation and multi-harmonic response characteristics, while typical controls consist of dc voltage control, positive-negative sequence separation-based phase current control, circulating current control, and some other linear controls. As a result, the proposed impedance model can be used not only to analyze the harmonic stability of an MMC-based dc system, but also to investigate the influence of additional controls in an MMC on system stability. Furthermore, the proposed model makes up for the deficiencies in harmonic stability analysis of MMC-based dc systems. The results of both the hardware-in-The-loop RT-LAB digital simulation and the physical experimentation validate the proposed impedance models and analyses.
AB - The dc impedance model of a modular multilevel converter (MMC) is the basis for analyzing harmonic resonances of MMC-based dc systems. As an MMC typifies a multiple harmonic response system, its internal dynamics and controls significantly influence its external characteristics. In this paper, a dc impedance model of an MMC is developed by harmonic transfer function method that considers the internal dynamics and typical controls of MMCs. The internal dynamics mainly include capacitor voltage fluctuation and multi-harmonic response characteristics, while typical controls consist of dc voltage control, positive-negative sequence separation-based phase current control, circulating current control, and some other linear controls. As a result, the proposed impedance model can be used not only to analyze the harmonic stability of an MMC-based dc system, but also to investigate the influence of additional controls in an MMC on system stability. Furthermore, the proposed model makes up for the deficiencies in harmonic stability analysis of MMC-based dc systems. The results of both the hardware-in-The-loop RT-LAB digital simulation and the physical experimentation validate the proposed impedance models and analyses.
KW - Harmonic stability
KW - impedance modeling
KW - modular multilevel converter (MMC)
KW - multilharmonic linearization
UR - https://www.scopus.com/pages/publications/85084746485
U2 - 10.1109/JESTPE.2019.2923272
DO - 10.1109/JESTPE.2019.2923272
M3 - 文章
AN - SCOPUS:85084746485
SN - 2168-6777
VL - 8
SP - 1152
EP - 1163
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 2
M1 - 8737710
ER -