Topology Synthesis of a Family of Integrated Three-Port Converters for Renewable Energy System Applications

• Published in: IEEE transactions on industrial electronics (1982) Vol. 68; no. 7; pp. 5833 - 5846
• Main Authors: Tian, Qingxin, Zhou, Guohua, Liu, Ruijun, Zhang, Xiaobing, Leng, Minrui
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Basic converters; Buck converters; Circuits; Compact structure; Low cost; Power flow; Renewable energy; Renewable energy sources; renewable energy system; Renewable resources; SISO (control systems); Switches; Synthesis; three-port converter; Topology; topology synthesis; Voltage control
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2020.2994864

In the standalone renewable energy system, a multiport converter is more desirable than several single-input converters as it has advantages of a simpler circuit, higher efficiency, and lower cost. This article proposes a novel topology synthesis method to derive integrated three-port converters with low cost and compact structure. With the proposed topology synthesis method, integrated three-port converters can be easily developed from conventional single-input single-output (SISO) converters by replacing a switch and a diode with a basic cell, including bidirectional power flow. Compared with the SISO converter, the derived integrated three-port converters only need to add the extra switch and diode, which makes them have low cost and compact structure. As an example, topology synthesis based on buck, boost, buck-boost, Cuk, SEPIC, and zeta converters is performed in this article. The proposed topology synthesis method can also be extended to deduce a series of n-port converters. In order to achieve a better understanding of the proposed converters, the integrated three-port SEPIC converter is specifically analyzed, including its operation principle, steady-state performance, small-signal modeling, and control system. Finally, experimental verifications have been carried out to illustrate the feasibility and effectiveness of the proposed topology synthesis method.