TY - GEN
T1 - An additional stabilizer for mitigating the instability in DC/DC cascaded system with constant power loads
AU - Tu, Yiming
AU - Liu, Zeng
AU - Liu, Jinjun
AU - Liu, Teng
AU - Liu, Zipeng
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/7/25
Y1 - 2017/7/25
N2 - Cascaded DC converters are becoming widely used in DC distributed power system. When a DC converter is tightly regulated, it operates as a constant power load (CPL). In a cascaded system, instability problems usually occurs due to the negative incremental impedance characteristic caused by a CPL. In order to mitigate instability, this paper proposes a new approach by adding an additional stabilizer in parallel with the intermediate DC bus of the cascaded system. Composed of a resistor and a bi-directional Buck-Boost converter, this stabilizer is controlled to emulate a RC damper. By reducing the output impedance of source converter, impedance based stability criterion is satisfied. After applying this stabilizer, both stability and dynamic performance of the cascaded system are improved. Lastly, a simulation based on two cascaded Buck converters is presented to verify the effectiveness of the proposed stabilizer.
AB - Cascaded DC converters are becoming widely used in DC distributed power system. When a DC converter is tightly regulated, it operates as a constant power load (CPL). In a cascaded system, instability problems usually occurs due to the negative incremental impedance characteristic caused by a CPL. In order to mitigate instability, this paper proposes a new approach by adding an additional stabilizer in parallel with the intermediate DC bus of the cascaded system. Composed of a resistor and a bi-directional Buck-Boost converter, this stabilizer is controlled to emulate a RC damper. By reducing the output impedance of source converter, impedance based stability criterion is satisfied. After applying this stabilizer, both stability and dynamic performance of the cascaded system are improved. Lastly, a simulation based on two cascaded Buck converters is presented to verify the effectiveness of the proposed stabilizer.
KW - cascaded system stability
KW - constant power loads
KW - impedance
KW - stabilizer
UR - https://www.scopus.com/pages/publications/85034089937
U2 - 10.1109/IFEEC.2017.7992354
DO - 10.1109/IFEEC.2017.7992354
M3 - 会议稿件
AN - SCOPUS:85034089937
T3 - 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
SP - 1982
EP - 1986
BT - 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
Y2 - 3 June 2017 through 7 June 2017
ER -