TY - JOUR
T1 - Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction
AU - Li, Xin
AU - Ruan, Xinbo
AU - Xiong, Xiaoling
AU - Jin, Qian
AU - Tse, Chi K.
N1 - Funding Information:
Manuscript received May 14, 2018; revised July 26, 2018; accepted October 10, 2018. Date of publication October 16, 2018; date of current version May 2, 2019. This work was supported by the National Natural Science Foundation of China for Distinguished Young Scholars under Award 51525701. Recommended for publication by Associate Editor G. Escobar. (Corresponding author: Xinbo Ruan.) X. Li, X. Ruan, and Q. Jin are with the Center for More-Electric-Aircraft Power System, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China (e-mail:, [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2019/7
Y1 - 2019/7
N2 - Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.
AB - Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.
KW - Adaptive
KW - Cascaded system
KW - Sample-and-hold, stability issue
KW - Switching ripple interaction (SRI)
UR - http://www.scopus.com/inward/record.url?scp=85055039043&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2018.2876627
DO - 10.1109/TPEL.2018.2876627
M3 - Journal article
AN - SCOPUS:85055039043
SN - 0885-8993
VL - 34
SP - 7040
EP - 7052
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 7
M1 - 8494812
ER -