TY - JOUR
T1 - Transient Mitigation Using an Auxiliary Circuit in Cascaded DC-DC Converter Systems with Virtual Impedance Control
AU - Shan, Zhenyu
AU - Fan, Shengwen
AU - Liu, Xiaotong
AU - Ding, Xiaofeng
AU - Li, Zhen
N1 - Publisher Copyright:
© 1982-2012 IEEE.
PY - 2022/5/1
Y1 - 2022/5/1
N2 - Most dc power distribution architectures are organized as a typical cascaded converter system that is composed of source and load converters, and may experience a system oscillation due to the negative impedance effect of constant power loads. The load-side virtual impedance method is a possible solution to such stability problem, which however makes the dynamic response of the load converter slow, and thus increases the requirement of the filter capacitance. In this article, an auxiliary circuit that is connected to the output port of the load converter is proposed to enhance the transient performance of the power converter system, while the system can be stabilized by the virtual impedance method. The control and parameter design of the proposed auxiliary circuit is introduced. The capacitance requirement of the system for an expected transient deviation of the output voltage is significantly reduced by using the proposed auxiliary circuit. An example design is given to verify the feasibility of the proposed method with simulation analysis and experimental results.
AB - Most dc power distribution architectures are organized as a typical cascaded converter system that is composed of source and load converters, and may experience a system oscillation due to the negative impedance effect of constant power loads. The load-side virtual impedance method is a possible solution to such stability problem, which however makes the dynamic response of the load converter slow, and thus increases the requirement of the filter capacitance. In this article, an auxiliary circuit that is connected to the output port of the load converter is proposed to enhance the transient performance of the power converter system, while the system can be stabilized by the virtual impedance method. The control and parameter design of the proposed auxiliary circuit is introduced. The capacitance requirement of the system for an expected transient deviation of the output voltage is significantly reduced by using the proposed auxiliary circuit. An example design is given to verify the feasibility of the proposed method with simulation analysis and experimental results.
KW - Cascaded dc-dc converter system
KW - load transient mitigation
KW - minor-loop gain
KW - virtual impedance control
UR - http://www.scopus.com/inward/record.url?scp=85107176684&partnerID=8YFLogxK
U2 - 10.1109/TIE.2021.3080208
DO - 10.1109/TIE.2021.3080208
M3 - Article
AN - SCOPUS:85107176684
SN - 0278-0046
VL - 69
SP - 4652
EP - 4664
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 5
ER -