DC-Link Current Minimization Control for Current Source Converter-Based Solid-State Transformer

Zheng, Liran; Han, Xiangyu; Kandula, Rajendra Prasad; Divan, Deepak

doi:10.1109/tpel.2022.3178433

DC-Link Current Minimization Control for Current Source Converter-Based Solid-State Transformer

Journal Article · Fri May 27 00:00:00 EDT 2022 · IEEE Transactions on Power Electronics

DOI:https://doi.org/10.1109/tpel.2022.3178433· OSTI ID:1892472

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Georgia Inst. of Technology, Atlanta, GA (United States); Georgia Institute of Technology
Tesla, Palo Alto, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)

This article proposes a fast predictive control method and a small DC-link inductor to minimize the DC-link current in current-source converter (CSC)-based solid-state transformer. The DC-link current minimization can significantly reduce power loss and improve efficiency. The challenge of this problem is on improving both steady-state and dynamic performance. PI control methods and large DC-link inductors are conventionally used in the CSC but have limited dynamic performance. A model predictive control (MPC) method is proposed to achieve switching-cycle-level settling time, and the DC-link inductor is sized for 40% ripple to enable fast current change. Importantly, this article also proposes to minimize the DC-link current by varying the current even within a line cycle under single-phase load to improve the steady-state performance, in contrast with the reduction to a constant value in the literature. The proposed MPC features a constant switching frequency without weighting factors. The MPC does not have a high computational burden and is implemented in a regular digital controller for a prototype of soft-switching solid-state transformer (S4T) with reduced conduction loss. The effectiveness of the proposed method has been experimentally verified on the SiC S4T prototype during steady-state and dynamics under different multiport power flow conditions up to 2 kV peak. Here, the DC-link current in the experiments is close to the minimum current with a short zero-vector duration, which further verifies the performance of the proposed method.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Inst. of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000899

OSTI ID:: 1892472

Journal Information:: IEEE Transactions on Power Electronics, Journal Name: IEEE Transactions on Power Electronics Journal Issue: 10 Vol. 37; ISSN 0885-8993

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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