A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Hamzeh ALJARAJREH
  • Dylan Dah-Chuan LU
  • Yam P. SIWAKOTI
  • Ricardo P. AGUILERA
  • Chi K. TSE

Detail(s)

Original languageEnglish
Pages (from-to)59184-59195
Journal / PublicationIEEE Access
Volume9
Online published19 Apr 2021
Publication statusPublished - 2021
Externally publishedYes

Abstract

This paper presents the design of three-port converters (TPCs) for smooth transitions (i.e., fast settling time, and no obvious overshoot/undershoot) of 7 distinctive operating modes, depending on sources and loads scheduling. Two viable converter configurations have been identified and selected for further analysis and design of PV-battery systems. Conventionally, mode transition is achieved by assigning specific switching patterns through feedback signals and appropriate control algorithms. This incurs a delay in the response and unavoidable noise in the circuit. Additionally, in TPCs, three voltage sensors and three current sensors are generally required for decision making in mode selection, where errors in sensors may lead to an inaccurate response. This paper presents a new control strategy where the number of switching patterns is significantly reduced to 3 patterns instead of minimum 5 patterns for existing reported topologies. Therefore, decisions are simplified so that the transition occurs naturally based on the power availability and load demand but not deliberately as in the conventional method. In addition, instead of six sensors, three voltage sensors and only one current sensor are required to achieve all the necessary operations, namely, MPPT, battery protection, and output regulation. Moreover, these sensors do not participate in mode selection decision, which leads to seamless and fast mode transition. In addition, this work considers two bidirectional ports as compared with only one bidirectional port in most reported topologies. This configuration enables both standalone and DC grid-connected applications. Experimental results are reported to verify the proposed solution.

Research Area(s)

  • Auto-transition, battery, bidirectional converter, mode selection, photovoltaic system and three-port converter

Citation Format(s)

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters. / ALJARAJREH, Hamzeh; LU, Dylan Dah-Chuan; SIWAKOTI, Yam P.; AGUILERA, Ricardo P.; TSE, Chi K.

In: IEEE Access, Vol. 9, 2021, p. 59184-59195.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review