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

Title: 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)
Tesla, Palo Alto, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (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.

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Research Organization:: Georgia Institute 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, Vol. 37, Issue 10; ISSN 0885-8993

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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solid-state transformer (SST)
three-port power electronic transformer (PET)
current-source inverter (CSI)
medium voltage (MV)
medium-frequency transformer (MFT)
variable DC link
efficiency improvement
loss reduction

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

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