Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids
Abstract Various disturbances in voltage source converter based high‐voltage, multi‐terminal DC grids will significantly cause DC voltage deviations when the classical voltage droop control is adopted. The unsatisfactory voltage deviations weaken the voltage regulation ability and increase the risk...
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2021-06-01
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Series: | IET Generation, Transmission & Distribution |
Online Access: | https://doi.org/10.1049/gtd2.12138 |
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doaj-e6a3b92634fc4cd7ba9f2444c0c6953c2021-07-14T13:20:19ZengWileyIET Generation, Transmission & Distribution1751-86871751-86952021-06-0115121830184010.1049/gtd2.12138Flexible controls to reduce DC voltage deviations in multi‐terminal DC gridsGuihong Wu0Zhengchun Du1Yangyang Zhao2Guiyuan Li3School of Electrical Engineering Xi'an Jiaotong University Xi'an ChinaSchool of Electrical Engineering Xi'an Jiaotong University Xi'an ChinaSchool of Electrical Engineering Xi'an Jiaotong University Xi'an ChinaThe State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou ChinaAbstract Various disturbances in voltage source converter based high‐voltage, multi‐terminal DC grids will significantly cause DC voltage deviations when the classical voltage droop control is adopted. The unsatisfactory voltage deviations weaken the voltage regulation ability and increase the risk of instability. Two flexible controls at the top of the classical voltage droop control to reduce voltage deviations are proposed, and the power–voltage (P–V) curves of the classical voltage droop control are translated co‐ordinately. Firstly, a global DC voltage oscillation damping control designed based on the Lyapunov theory is proposed for transient voltage deviations. Secondly, a constant weighted voltage control is designed for reducing steady weighted voltage deviations. The steady active power injections keep almost unchanged under proposed controls, consistent with those under only the classical voltage droop control. The stability influence and the power flow impact are carried out to evaluate the proposed controls theoretically. Tests are conducted on a multi‐terminal DC grid with five‐terminal voltage source converters. Simulation results show the proposed controls' effectiveness and superiority under various fault conditions, including both the outage of a constant power voltage source converter and a droop voltage source converter.https://doi.org/10.1049/gtd2.12138 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Guihong Wu Zhengchun Du Yangyang Zhao Guiyuan Li |
spellingShingle |
Guihong Wu Zhengchun Du Yangyang Zhao Guiyuan Li Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids IET Generation, Transmission & Distribution |
author_facet |
Guihong Wu Zhengchun Du Yangyang Zhao Guiyuan Li |
author_sort |
Guihong Wu |
title |
Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids |
title_short |
Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids |
title_full |
Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids |
title_fullStr |
Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids |
title_full_unstemmed |
Flexible controls to reduce DC voltage deviations in multi‐terminal DC grids |
title_sort |
flexible controls to reduce dc voltage deviations in multi‐terminal dc grids |
publisher |
Wiley |
series |
IET Generation, Transmission & Distribution |
issn |
1751-8687 1751-8695 |
publishDate |
2021-06-01 |
description |
Abstract Various disturbances in voltage source converter based high‐voltage, multi‐terminal DC grids will significantly cause DC voltage deviations when the classical voltage droop control is adopted. The unsatisfactory voltage deviations weaken the voltage regulation ability and increase the risk of instability. Two flexible controls at the top of the classical voltage droop control to reduce voltage deviations are proposed, and the power–voltage (P–V) curves of the classical voltage droop control are translated co‐ordinately. Firstly, a global DC voltage oscillation damping control designed based on the Lyapunov theory is proposed for transient voltage deviations. Secondly, a constant weighted voltage control is designed for reducing steady weighted voltage deviations. The steady active power injections keep almost unchanged under proposed controls, consistent with those under only the classical voltage droop control. The stability influence and the power flow impact are carried out to evaluate the proposed controls theoretically. Tests are conducted on a multi‐terminal DC grid with five‐terminal voltage source converters. Simulation results show the proposed controls' effectiveness and superiority under various fault conditions, including both the outage of a constant power voltage source converter and a droop voltage source converter. |
url |
https://doi.org/10.1049/gtd2.12138 |
work_keys_str_mv |
AT guihongwu flexiblecontrolstoreducedcvoltagedeviationsinmultiterminaldcgrids AT zhengchundu flexiblecontrolstoreducedcvoltagedeviationsinmultiterminaldcgrids AT yangyangzhao flexiblecontrolstoreducedcvoltagedeviationsinmultiterminaldcgrids AT guiyuanli flexiblecontrolstoreducedcvoltagedeviationsinmultiterminaldcgrids |
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1721302978156036096 |