TY - JOUR
T1 - Review of Small-Signal Modeling Methods Including Frequency-Coupling Dynamics of Power Converters
AU - Yue, Xiaolong
AU - Wang, Xiongfei
AU - Blaabjerg, Frede
PY - 2019/4
Y1 - 2019/4
N2 - Over the past years, the linearized modeling techniques for power converters have been continuously developed to capture the small-signal dynamics beyond half the switching frequency. This paper reviews and compares the small-signal modeling approaches based on a buck converter with voltage-mode control. The study includes the small-signal averaged modeling approach, the describing function method, and the harmonic state-space modeling approach, in order to be able to better select the correct method when modeling and analyzing a power electronic circuit as well as a power-electronic-based power system. The model comparison points out that the describing-function-based models do improve the modeling accuracy beyond the half-switching frequency of the converter, yet they fail to predict the frequency-coupling interactions (e.g., beat frequency oscillations) among multiple converters, and instead, harmonic state-space models in the multiple-input multiple-output form are required.
AB - Over the past years, the linearized modeling techniques for power converters have been continuously developed to capture the small-signal dynamics beyond half the switching frequency. This paper reviews and compares the small-signal modeling approaches based on a buck converter with voltage-mode control. The study includes the small-signal averaged modeling approach, the describing function method, and the harmonic state-space modeling approach, in order to be able to better select the correct method when modeling and analyzing a power electronic circuit as well as a power-electronic-based power system. The model comparison points out that the describing-function-based models do improve the modeling accuracy beyond the half-switching frequency of the converter, yet they fail to predict the frequency-coupling interactions (e.g., beat frequency oscillations) among multiple converters, and instead, harmonic state-space models in the multiple-input multiple-output form are required.
KW - Averaged model
KW - Crossed-frequency model
KW - dc-dc converters
KW - Describing function
KW - Harmonic state space (HSS)
KW - Small-signal modeling approach
UR - http://www.scopus.com/inward/record.url?scp=85049804479&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2018.2848980
DO - 10.1109/TPEL.2018.2848980
M3 - Journal article
AN - SCOPUS:85049804479
SN - 0885-8993
VL - 34
SP - 3313
EP - 3328
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 4
M1 - 8410450
ER -