Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

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2.10

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SihuaWang1, Yougeng Zhao This email address is being protected from spambots. You need JavaScript enabled to view it.1, Gaofei Zheng1, Wenhui Zhang1, and Xujie Li1

1School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China


 

Received: March 29, 2022
Accepted: September 22, 2022
Publication Date: November 2, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.6180/jase.202308_26(8).0007  


ABSTRACT


In order to provide voltage support to the AC system at the receiving end by relying on the continuously adjustable capability of VSC active and reactive power when the hybrid doubly-fed DC transmission system fails, based on analyzing the failure mechanism of continuous commutation of LCC, the reactive power characteristics of ac fault on the inverter side and the characteristics of constant AC voltage, A VSC additional transient voltage regulation control strategy module based on AC voltage change rate control is designed. According to the voltage change rate of the bus when the fault occurs, the strategy can improve the characteristics of the AC transient voltage by suppressing the transient low voltage module and suppressing the transient overvoltage module with additional compensating voltage value. Finally, based on PSCAD/EMTDC, a simulation model of the hybrid doubly-fed HVDC system is established, and the simulation results under different AC faults with different duration are compared and analyzed, which verifies the superiority of the proposed control strategy compared with the constant AC voltage control.


Keywords: hybrid HVDC; commutation failure; transient voltage regulation; reactive power support


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