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DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter with Zero Steady-State Error and Reduced System Type
Tian, Yanjun Loh, Poh C. Deng, Fujin Chen, Zhe Hu, Yanting
Tian, Yanjun
Loh, Poh C.
Deng, Fujin
Chen, Zhe
Hu, Yanting
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2015-06-11
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Abstract
Cascaded converter is formed by connecting two sub-converters together, sharing a common intermediate DC-link voltage. Regulation of this DC-link voltage is frequently realized with a Proportional-Integral (PI) controller, whose high gain at DC helps to force a zero steady-state tracking error. Such precise tracking is however at the expense of increasing the system type, caused by the extra pole at the origin introduced by the PI controller. The overall system may hence be tougher to control. To reduce the system type while preserving precise DC-link voltage tracking, this paper proposes a coordinated control scheme for the cascaded converter, which uses only a proportional DC-link voltage regulator. The resulting converter is thus dynamically faster, and when compared with the conventional PI-controlled converter, it is less affected by impedance interaction between its two sub-converters. The proposed scheme can be used with either unidirectional or bidirectional power flow, and has been verified by simulation and experimental results presented in the paper.
Citation
Tian, Y., Loh, P. C., Deng, F., Chen, Z., & Hu, Y. (2016). DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type. IEEE Transactions on Power Electronics, 31(4), 3177-3188. doi: 10.1109/TPEL.2015.2444386
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IEEE
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IEEE Transactions on Power Electronics
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Article
Language
en
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copyright 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
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ISSN
0885-8993
EISSN
1941-0107