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High frequency linked three port converter with optimized control based on power system load flow concepts for PV-battery systems

journal contribution
posted on 2022-10-18, 04:26 authored by Md Mejbaul Haque, Peter WolfsPeter Wolfs, Sanath AlahakoonSanath Alahakoon, Frede Blaabjerg
This paper proposes an optimized modulation and control strategy for high frequency linked three port converters (HFL-TPCs) which is conceptually derived from the generalized load flow equations of a typical power system. The power system analogy explains why single phase shift (SPS) modulation results in higher reactive currents that reduce the overall converter efficiency. The SPS converter also loses zero voltage switching (ZVS) at lower power operations. The proposed optimized quintuple phase shift (QPS) modulation method allows dynamic control of duty cycles of the HF square wave voltages that potentially control the real and reactive power flows of the HFL-TPC. The QPS modulation phase variables are applied to derive the generalized models of the HFL-TPC using a harmonic analysis approach. Harmonic analysis and the optimized modulation strategy greatly simplify the theoretical analysis of the HFL-TPC as compared to a piecewise time domain approach. A detailed power loss model of the HFL-TPC is also discussed. To verify the practical feasibility of the proposed optimized modulation strategies, a 60 V, 400 W HFL-TPC is built and tested. Simulation and experimental results show that the proposed modulation method reduces reactive power, improves efficiency, and maintains the ZVS operation over a wide voltage and power range.

History

Volume

10

Issue

1

Start Page

1032

End Page

1045

Number of Pages

14

eISSN

2168-6785

ISSN

2168-6777

Publisher

IEEE

Peer Reviewed

  • Yes

Open Access

  • No

Acceptance Date

2021-07-05

External Author Affiliations

Aalborg University, Denmark

Era Eligible

  • Yes

Journal

IEEE Journal of Emerging and Selected Topics in Power Electronics