Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer

Liran Zheng; Rajendra Prasad Kandula; Deepak Divan

doi:10.1109/ECCE44975.2020.9235737

Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer

Liran Zheng, Rajendra Prasad Kandula, Deepak Divan

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

9 Scopus citations

Abstract

This paper presents a fast predictive control method for active power decoupling of a reduced dc-link medium-voltage (MV) solid-state transformer (SST). Typical configurations of the SSTs are multiple series-stacked modules to interface the MV, which requires the modules to be single phase in nature. One critical issue in the single-phase SSTs is 120 Hz power fluctuation. Traditionally, large passives are used to buffer the 120 Hz power for 5% ripple on the dc-link, which significantly increases footprint and cost. This paper proposes active power decoupling strategy for the MV SST, i.e., adding an additional capacitor port to buffer the 120 Hz power fluctuation with 30% ripple on the capacitor port for smaller capacitance requirements. Moreover, significantly, different from conventional single-phase converters with small dc-link ripple, the dc-link itself is sized for 30%-60% pk-pk switching-frequency ripple to further minimize the dc-link passives in this paper. For such a converter with small passives, the control should be fast enough to ensure small over/undershoot on the dc-link during transients for safe and reliable operation. To address the challenge, direct dc-link regulation is proposed rather than traditional indirect dc-link regulation in terms of control architecture. Based on this control architecture, a model based predictive control method, which updates every switching cycle for a deadbeat response on the dc-link, is proposed. Simulation and experimental results at 2 kV verify the effectiveness of the proposed direct dc-link predictive control method for active power decoupling and reduced dc-link in the MV SST application.

Original language	English
Title of host publication	ECCE 2020 - IEEE Energy Conversion Congress and Exposition
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	4124-4129
Number of pages	6
ISBN (Electronic)	9781728158266
DOIs	https://doi.org/10.1109/ECCE44975.2020.9235737
State	Published - Oct 11 2020
Externally published	Yes
Event	12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States Duration: Oct 11 2020 → Oct 15 2020

Publication series

Name	ECCE 2020 - IEEE Energy Conversion Congress and Exposition

Conference

Conference	12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Country/Territory	United States
City	Virtual, Detroit
Period	10/11/20 → 10/15/20

Funding

This work is supported by ARPA-E under DE-AR0000899 and Center for Distributed Energy, Georgia Tech. ACKNOWLEDGMENT The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0000899 in the CIRCUITS program monitored by Dr. Isik Kizilyalli. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Keywords

active power decoupling
dead beat control
digital control
electrolytic capacitor-less
model predictive priority-shifting control (MPPS)
modular soft-switching solid-state transformer (M-S4T)
Power electronic transformer (PET)
stacked low-inertia converter (SLIC)

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10.1109/ECCE44975.2020.9235737

Cite this

Zheng, L., Prasad Kandula, R., & Divan, D. (2020). Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer. In ECCE 2020 - IEEE Energy Conversion Congress and Exposition (pp. 4124-4129). Article 9235737 (ECCE 2020 - IEEE Energy Conversion Congress and Exposition). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE44975.2020.9235737

Zheng, Liran ; Prasad Kandula, Rajendra ; Divan, Deepak. / Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer. ECCE 2020 - IEEE Energy Conversion Congress and Exposition. Institute of Electrical and Electronics Engineers Inc., 2020. pp. 4124-4129 (ECCE 2020 - IEEE Energy Conversion Congress and Exposition).

@inproceedings{4be434647bc241acbf5494e49c8a1320,

title = "Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer",

abstract = "This paper presents a fast predictive control method for active power decoupling of a reduced dc-link medium-voltage (MV) solid-state transformer (SST). Typical configurations of the SSTs are multiple series-stacked modules to interface the MV, which requires the modules to be single phase in nature. One critical issue in the single-phase SSTs is 120 Hz power fluctuation. Traditionally, large passives are used to buffer the 120 Hz power for 5\% ripple on the dc-link, which significantly increases footprint and cost. This paper proposes active power decoupling strategy for the MV SST, i.e., adding an additional capacitor port to buffer the 120 Hz power fluctuation with 30\% ripple on the capacitor port for smaller capacitance requirements. Moreover, significantly, different from conventional single-phase converters with small dc-link ripple, the dc-link itself is sized for 30\%-60\% pk-pk switching-frequency ripple to further minimize the dc-link passives in this paper. For such a converter with small passives, the control should be fast enough to ensure small over/undershoot on the dc-link during transients for safe and reliable operation. To address the challenge, direct dc-link regulation is proposed rather than traditional indirect dc-link regulation in terms of control architecture. Based on this control architecture, a model based predictive control method, which updates every switching cycle for a deadbeat response on the dc-link, is proposed. Simulation and experimental results at 2 kV verify the effectiveness of the proposed direct dc-link predictive control method for active power decoupling and reduced dc-link in the MV SST application.",

keywords = "active power decoupling, dead beat control, digital control, electrolytic capacitor-less, model predictive priority-shifting control (MPPS), modular soft-switching solid-state transformer (M-S4T), Power electronic transformer (PET), stacked low-inertia converter (SLIC)",

author = "Liran Zheng and \{Prasad Kandula\}, Rajendra and Deepak Divan",

note = "Publisher Copyright: {\textcopyright} 2020 IEEE.; 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 ; Conference date: 11-10-2020 Through 15-10-2020",

year = "2020",

month = oct,

day = "11",

doi = "10.1109/ECCE44975.2020.9235737",

language = "English",

series = "ECCE 2020 - IEEE Energy Conversion Congress and Exposition",

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Zheng, L, Prasad Kandula, R & Divan, D 2020, Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer. in ECCE 2020 - IEEE Energy Conversion Congress and Exposition., 9235737, ECCE 2020 - IEEE Energy Conversion Congress and Exposition, Institute of Electrical and Electronics Engineers Inc., pp. 4124-4129, 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020, Virtual, Detroit, United States, 10/11/20. https://doi.org/10.1109/ECCE44975.2020.9235737

Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer. / Zheng, Liran; Prasad Kandula, Rajendra; Divan, Deepak.
ECCE 2020 - IEEE Energy Conversion Congress and Exposition. Institute of Electrical and Electronics Engineers Inc., 2020. p. 4124-4129 9235737 (ECCE 2020 - IEEE Energy Conversion Congress and Exposition).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer

AU - Zheng, Liran

AU - Prasad Kandula, Rajendra

AU - Divan, Deepak

PY - 2020/10/11

Y1 - 2020/10/11

N2 - This paper presents a fast predictive control method for active power decoupling of a reduced dc-link medium-voltage (MV) solid-state transformer (SST). Typical configurations of the SSTs are multiple series-stacked modules to interface the MV, which requires the modules to be single phase in nature. One critical issue in the single-phase SSTs is 120 Hz power fluctuation. Traditionally, large passives are used to buffer the 120 Hz power for 5% ripple on the dc-link, which significantly increases footprint and cost. This paper proposes active power decoupling strategy for the MV SST, i.e., adding an additional capacitor port to buffer the 120 Hz power fluctuation with 30% ripple on the capacitor port for smaller capacitance requirements. Moreover, significantly, different from conventional single-phase converters with small dc-link ripple, the dc-link itself is sized for 30%-60% pk-pk switching-frequency ripple to further minimize the dc-link passives in this paper. For such a converter with small passives, the control should be fast enough to ensure small over/undershoot on the dc-link during transients for safe and reliable operation. To address the challenge, direct dc-link regulation is proposed rather than traditional indirect dc-link regulation in terms of control architecture. Based on this control architecture, a model based predictive control method, which updates every switching cycle for a deadbeat response on the dc-link, is proposed. Simulation and experimental results at 2 kV verify the effectiveness of the proposed direct dc-link predictive control method for active power decoupling and reduced dc-link in the MV SST application.

AB - This paper presents a fast predictive control method for active power decoupling of a reduced dc-link medium-voltage (MV) solid-state transformer (SST). Typical configurations of the SSTs are multiple series-stacked modules to interface the MV, which requires the modules to be single phase in nature. One critical issue in the single-phase SSTs is 120 Hz power fluctuation. Traditionally, large passives are used to buffer the 120 Hz power for 5% ripple on the dc-link, which significantly increases footprint and cost. This paper proposes active power decoupling strategy for the MV SST, i.e., adding an additional capacitor port to buffer the 120 Hz power fluctuation with 30% ripple on the capacitor port for smaller capacitance requirements. Moreover, significantly, different from conventional single-phase converters with small dc-link ripple, the dc-link itself is sized for 30%-60% pk-pk switching-frequency ripple to further minimize the dc-link passives in this paper. For such a converter with small passives, the control should be fast enough to ensure small over/undershoot on the dc-link during transients for safe and reliable operation. To address the challenge, direct dc-link regulation is proposed rather than traditional indirect dc-link regulation in terms of control architecture. Based on this control architecture, a model based predictive control method, which updates every switching cycle for a deadbeat response on the dc-link, is proposed. Simulation and experimental results at 2 kV verify the effectiveness of the proposed direct dc-link predictive control method for active power decoupling and reduced dc-link in the MV SST application.

KW - active power decoupling

KW - dead beat control

KW - digital control

KW - electrolytic capacitor-less

KW - model predictive priority-shifting control (MPPS)

KW - modular soft-switching solid-state transformer (M-S4T)

KW - Power electronic transformer (PET)

KW - stacked low-inertia converter (SLIC)

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DO - 10.1109/ECCE44975.2020.9235737

M3 - Conference contribution

AN - SCOPUS:85097168707

T3 - ECCE 2020 - IEEE Energy Conversion Congress and Exposition

SP - 4124

EP - 4129

BT - ECCE 2020 - IEEE Energy Conversion Congress and Exposition

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

Y2 - 11 October 2020 through 15 October 2020

ER -

Zheng L, Prasad Kandula R, Divan D. Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer. In ECCE 2020 - IEEE Energy Conversion Congress and Exposition. Institute of Electrical and Electronics Engineers Inc. 2020. p. 4124-4129. 9235737. (ECCE 2020 - IEEE Energy Conversion Congress and Exposition). doi: 10.1109/ECCE44975.2020.9235737

Predictive Direct DC-Link Control for Active Power Decoupling of A Single-Phase Reduced DC-Link MV Solid-State Transformer

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