Power coupling analysis and improved decoupling control for the VSC connected to a weak AC grid

Bingbing Shao; Qi Xiao; Lingfei Xiong; Liyuan Wang; Yongheng Yang; Zhe Chen; Frede Blaabjerg; Josep M. Guerrero

doi:10.1016/j.ijepes.2022.108645

Power coupling analysis and improved decoupling control for the VSC connected to a weak AC grid

Bingbing Shao^*, Qi Xiao, Lingfei Xiong, Liyuan Wang, Yongheng Yang, Zhe Chen, Frede Blaabjerg, Josep M. Guerrero

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

43 Citations (Scopus)

Abstract

Conventional vector control (VC) is widely used in the voltage source converter (VSC) due to its simplicity and power decoupling ability. However, this paper reveals that the VC may result in strong active and reactive power coupling under weak AC grid conditions. The linearized relationship between the power and dq-axis currents is built. On this basis, the power coupling mechanism is revealed, and the power coupling process is presented. Finally, an improved decoupled power control is accordingly proposed based on the feedforward compensation method. The improved decoupling control method can realize more accurate decoupled active and reactive power regulation. Moreover, its design is simple, and thus is easy to be implemented in practice. The power coupling characteristics analysis and the improved power decoupling control are verified through PSCAD/EMTDC simulations and experiments.

Original language	English
Article number	108645
Journal	International Journal of Electrical Power & Energy Systems
Volume	145
Number of pages	15
ISSN	0142-0615
DOIs	https://doi.org/10.1016/j.ijepes.2022.108645
Publication status	Published - Feb 2023

Bibliographical note

Funding Information:
The work was supported in part by the National Natural Science Foundation of China (52207086) and in part by the Fundamental Research Funds for the Central Universities (JZ2022HGQA0124, JZ2022HGTA0330, PA2022GDSK0070).

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

Decoupling control
Power coupling
Vector control
Voltage source converter
Weak AC grid

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title = "Power coupling analysis and improved decoupling control for the VSC connected to a weak AC grid",

abstract = "Conventional vector control (VC) is widely used in the voltage source converter (VSC) due to its simplicity and power decoupling ability. However, this paper reveals that the VC may result in strong active and reactive power coupling under weak AC grid conditions. The linearized relationship between the power and dq-axis currents is built. On this basis, the power coupling mechanism is revealed, and the power coupling process is presented. Finally, an improved decoupled power control is accordingly proposed based on the feedforward compensation method. The improved decoupling control method can realize more accurate decoupled active and reactive power regulation. Moreover, its design is simple, and thus is easy to be implemented in practice. The power coupling characteristics analysis and the improved power decoupling control are verified through PSCAD/EMTDC simulations and experiments.",

keywords = "Decoupling control, Power coupling, Vector control, Voltage source converter, Weak AC grid",

author = "Bingbing Shao and Qi Xiao and Lingfei Xiong and Liyuan Wang and Yongheng Yang and Zhe Chen and Frede Blaabjerg and Guerrero, {Josep M.}",

note = "Funding Information: The work was supported in part by the National Natural Science Foundation of China (52207086) and in part by the Fundamental Research Funds for the Central Universities (JZ2022HGQA0124, JZ2022HGTA0330, PA2022GDSK0070). Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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T1 - Power coupling analysis and improved decoupling control for the VSC connected to a weak AC grid

AU - Shao, Bingbing

AU - Xiao, Qi

AU - Xiong, Lingfei

AU - Wang, Liyuan

AU - Yang, Yongheng

AU - Chen, Zhe

AU - Blaabjerg, Frede

AU - Guerrero, Josep M.

N1 - Funding Information: The work was supported in part by the National Natural Science Foundation of China (52207086) and in part by the Fundamental Research Funds for the Central Universities (JZ2022HGQA0124, JZ2022HGTA0330, PA2022GDSK0070). Publisher Copyright: © 2022 Elsevier Ltd

PY - 2023/2

Y1 - 2023/2

N2 - Conventional vector control (VC) is widely used in the voltage source converter (VSC) due to its simplicity and power decoupling ability. However, this paper reveals that the VC may result in strong active and reactive power coupling under weak AC grid conditions. The linearized relationship between the power and dq-axis currents is built. On this basis, the power coupling mechanism is revealed, and the power coupling process is presented. Finally, an improved decoupled power control is accordingly proposed based on the feedforward compensation method. The improved decoupling control method can realize more accurate decoupled active and reactive power regulation. Moreover, its design is simple, and thus is easy to be implemented in practice. The power coupling characteristics analysis and the improved power decoupling control are verified through PSCAD/EMTDC simulations and experiments.

AB - Conventional vector control (VC) is widely used in the voltage source converter (VSC) due to its simplicity and power decoupling ability. However, this paper reveals that the VC may result in strong active and reactive power coupling under weak AC grid conditions. The linearized relationship between the power and dq-axis currents is built. On this basis, the power coupling mechanism is revealed, and the power coupling process is presented. Finally, an improved decoupled power control is accordingly proposed based on the feedforward compensation method. The improved decoupling control method can realize more accurate decoupled active and reactive power regulation. Moreover, its design is simple, and thus is easy to be implemented in practice. The power coupling characteristics analysis and the improved power decoupling control are verified through PSCAD/EMTDC simulations and experiments.

KW - Decoupling control

KW - Power coupling

KW - Vector control

KW - Voltage source converter

KW - Weak AC grid

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DO - 10.1016/j.ijepes.2022.108645

M3 - Journal article

AN - SCOPUS:85139324996

SN - 0142-0615

VL - 145

JO - International Journal of Electrical Power & Energy Systems

JF - International Journal of Electrical Power & Energy Systems

M1 - 108645

ER -

Power coupling analysis and improved decoupling control for the VSC connected to a weak AC grid

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Keywords

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