Multiport Control with Partial Power Processing in Solid-State Transformer for PV, Storage, and Fast-Charging Electric Vehicle Integration

Liran Zheng, Rajendra Prasad Kandula, Deepak Divan

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This article proposes a multiport control method to enable partial power processing (PPP) in a medium-voltage (MV) multiport solid-state transformer (SST). MV multiport SSTs are promising in integrating low-voltage dc sources or loads such as solar photovoltaic, energy storage, and electric vehicles into smart grids without bulky line-frequency transformers. Compared with voltage-source SST, current-source (CS) SST features single-stage isolated bidirectional ac/ac, ac/dc, or dc/dc conversion using an inductive dc link. For a multiport CS SST, it is revealed in this article that the PPP capability can be enabled through the proposed control without extra hardware, different from the case of voltage-source converters where special hardware architecture is required for the PPP. With the PPP, most power exchange between LV ports is processed by only a fraction of the entire conversion stage, leading to reduced dc-link current, volume, loss, and improved efficiency. The proposed multiport PPP control scheme is analyzed to verify the advantages across a wide voltage and power range against conventional full power processing (FPP) multiport control, using the soft-switching SST (S4T) with reduced conduction loss as an example. Comparative experimental results based on a SiC three-port S4T prototype verify the effectiveness of the proposed PPP scheme against the FPP scheme under both steady state and dynamic conditions. The dc-link current reduction is measured to be more than 36%. Significantly, the proposed multiport PPP control scheme is generic and applicable to any hard-switching or soft-switching CS SSTs without extra hardware.

Original languageEnglish
Pages (from-to)2606-2616
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume38
Issue number2
DOIs
StatePublished - Feb 1 2023

Keywords

  • Battery energy storage system (BESS)
  • current-source converter (CSC)
  • current-source inverter (CSI)
  • differential power processing (DPP)
  • distributed renewable energy resource
  • electric vehicle (EV)
  • medium-frequency transformer (MFT)
  • mod-ulation
  • photovoltaic (PV)
  • power electronic transformer (PET)

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