Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

Yonghao Gui; Renke Han; Josep M. Guerrero; Juan C. Vasquez; Baoze Wei; Wonhee Kim

doi:10.1109/TEC.2021.3057130

Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

Yonghao Gui, Renke Han, Josep M. Guerrero, Juan C. Vasquez, Baoze Wei, Wonhee Kim

Research output: Contribution to journal › Article › peer-review

97 Scopus citations

Abstract

In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.

Original language	English
Article number	9347789
Pages (from-to)	2534-2544
Number of pages	11
Journal	IEEE Transactions on Energy Conversion
Volume	36
Issue number	3
DOIs	https://doi.org/10.1109/TEC.2021.3057130
State	Published - Sep 2021
Externally published	Yes

Funding

Manuscript received October 13, 2020; revised January 6, 2021; accepted January 29, 2021. Date of publication February 4, 2021; date of current version August 20, 2021. This work was supported in part by Energy Cloud R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT (NRF-2019M3F2A1073313), and in part by VIL-LUM FONDEN under the VILLUM Investigator under Grant 25920: Center for Research on Microgrids (CROM). Paper no. TEC-01024-2020. (Corresponding author: Wonhee Kim.) Yonghao Gui is with the Department of Electronic Systems, Aalborg University, 9220 Aalborg, Denmark (e-mail: [email protected]).

Keywords

DC microgrid
DC-DC converter
constant power load
disturbance observer
exponentially stable

Access to Document

10.1109/TEC.2021.3057130

Cite this

@article{d380f6993e3d4de0970e8be31dab0eb1,

title = "Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid",

abstract = "In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.",

keywords = "DC microgrid, DC-DC converter, constant power load, disturbance observer, exponentially stable",

author = "Yonghao Gui and Renke Han and Guerrero, {Josep M.} and Vasquez, {Juan C.} and Baoze Wei and Wonhee Kim",

note = "Publisher Copyright: {\textcopyright} 1986-2012 IEEE.",

year = "2021",

month = sep,

doi = "10.1109/TEC.2021.3057130",

language = "English",

volume = "36",

pages = "2534--2544",

journal = "IEEE Transactions on Energy Conversion",

issn = "0885-8969",

publisher = "Institute of Electrical and Electronics Engineers",

number = "3",

}

TY - JOUR

T1 - Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

AU - Gui, Yonghao

AU - Han, Renke

AU - Guerrero, Josep M.

AU - Vasquez, Juan C.

AU - Wei, Baoze

AU - Kim, Wonhee

PY - 2021/9

Y1 - 2021/9

N2 - In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.

AB - In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.

KW - DC microgrid

KW - DC-DC converter

KW - constant power load

KW - disturbance observer

KW - exponentially stable

UR - http://www.scopus.com/inward/record.url?scp=85100866098&partnerID=8YFLogxK

U2 - 10.1109/TEC.2021.3057130

DO - 10.1109/TEC.2021.3057130

M3 - Article

AN - SCOPUS:85100866098

SN - 0885-8969

VL - 36

SP - 2534

EP - 2544

JO - IEEE Transactions on Energy Conversion

JF - IEEE Transactions on Energy Conversion

IS - 3

M1 - 9347789

ER -

Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this