Design of Symmetrical CLLC-Resonant DC Transformer Considering Voltage Transfer Ratio and Cascaded System Stability

Autor:	Hao Ma, Xin Zhang, Chunwei Cai, Fanfan Lin, Xinze Li
Rok vydání:	2022
Předmět:	Computer science Particle swarm optimization Capacitance law.invention Inductance Control and Systems Engineering Control theory law RLC circuit Microgrid Electrical and Electronic Engineering Transformer Electrical impedance Galvanic isolation
Zdroj:	IEEE Transactions on Industrial Electronics. 69:463-474
ISSN:	1557-9948 0278-0046
Popis:	Due to the galvanic isolation and excellent bidirectional power-transfer capacity, the symmetrical CLLC-resonant dc transformer (DCT) has received increasing attention and has been popularly adopted in dc microgrid. However, for good comprehensive performance, there are some concerns in the design of CLLC-resonant DCT. First, when it operates individually, its voltage transfer ratio (VTR) is hard to maintain within an acceptable range when fluctuations of inductance or capacitance exist in practice. Second, when the CLLC-resonant DCT operates in a cascaded system with a constant power load, impedance interactions may result in instability phenomenon. The fluctuations of inductance or capacitance will also affect the stability of this cascaded system. In order to deal with these concerns, a parameter design approach for the CLLC-resonant DCT is put forward in this article. A particle swarm optimization algorithm is specially applied to realize thorough considerations of unpredictable parameter fluctuations. Thus, the designed CLLC-resonant DCT is able to maintain robust VTR and system stability when circuit parameter fluctuations exist. In the end, a 1-kW prototype has proved the validity of this proposed design approach.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4b91dba6c10c8851eef964cde68b1fd0 https://doi.org/10.1109/tie.2020.3048283 Zobrazit plný text záznamu