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Inertial imitation method of MMC with hybrid topology for VSC-HVDC
A new virtual synchronous generator (VSG) control strategy was researched and proposed for a VSC-HVDC (High Voltage Direct Current Based on Voltage Source Converter) transmission system. It can be applied to half-bridge or full-half-bridge hybrid topology modular multi-level converter (MMC) to impro...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9733882/ https://www.ncbi.nlm.nih.gov/pubmed/36490297 http://dx.doi.org/10.1371/journal.pone.0277553 |
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author | Wu, Jie Yin, Shiyi Li, Chuanjiang Zhang, Qiaozhen |
author_facet | Wu, Jie Yin, Shiyi Li, Chuanjiang Zhang, Qiaozhen |
author_sort | Wu, Jie |
collection | PubMed |
description | A new virtual synchronous generator (VSG) control strategy was researched and proposed for a VSC-HVDC (High Voltage Direct Current Based on Voltage Source Converter) transmission system. It can be applied to half-bridge or full-half-bridge hybrid topology modular multi-level converter (MMC) to improve the stability and reliability of the system. First, it is proposed that the energy stored in the equivalent capacitor of MMC power module was used to imitate the rotor inertial of synchronous generator. It can buffer transient power fluctuations and synchronize autonomously with the grid. Then the impedance characteristics of the proposed control method have been deduced and analyzed. The results show that the VSG control loop mainly improves the low frequency characteristics of the converter. Secondly, the ability to suppress transient fault current is weak. So, a method, that the given values of inner current loop are calculated by grid impedance matrix, was used. A double closed loop control structure composed by a power outer loop based on VSG control and a current inner loop is obtained. The simulation results show that it can effectively improve the current control capability during the transient process for systems with a 1:2 ratio of converter capacity to grid capacity (The grid short-circuit capacity is 60MW and the MMC is 30 MW). Finally, a hybrid MMC simulation model was built based on PSCAD and the steady-state and transient fault ride-through simulations were performed. The power adjustment time of MMC under the proposed VSG control is about 1s, while the adjustment time under the conventional control strategy is greater than 4s. |
format | Online Article Text |
id | pubmed-9733882 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-97338822022-12-10 Inertial imitation method of MMC with hybrid topology for VSC-HVDC Wu, Jie Yin, Shiyi Li, Chuanjiang Zhang, Qiaozhen PLoS One Research Article A new virtual synchronous generator (VSG) control strategy was researched and proposed for a VSC-HVDC (High Voltage Direct Current Based on Voltage Source Converter) transmission system. It can be applied to half-bridge or full-half-bridge hybrid topology modular multi-level converter (MMC) to improve the stability and reliability of the system. First, it is proposed that the energy stored in the equivalent capacitor of MMC power module was used to imitate the rotor inertial of synchronous generator. It can buffer transient power fluctuations and synchronize autonomously with the grid. Then the impedance characteristics of the proposed control method have been deduced and analyzed. The results show that the VSG control loop mainly improves the low frequency characteristics of the converter. Secondly, the ability to suppress transient fault current is weak. So, a method, that the given values of inner current loop are calculated by grid impedance matrix, was used. A double closed loop control structure composed by a power outer loop based on VSG control and a current inner loop is obtained. The simulation results show that it can effectively improve the current control capability during the transient process for systems with a 1:2 ratio of converter capacity to grid capacity (The grid short-circuit capacity is 60MW and the MMC is 30 MW). Finally, a hybrid MMC simulation model was built based on PSCAD and the steady-state and transient fault ride-through simulations were performed. The power adjustment time of MMC under the proposed VSG control is about 1s, while the adjustment time under the conventional control strategy is greater than 4s. Public Library of Science 2022-12-09 /pmc/articles/PMC9733882/ /pubmed/36490297 http://dx.doi.org/10.1371/journal.pone.0277553 Text en © 2022 Wu et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Wu, Jie Yin, Shiyi Li, Chuanjiang Zhang, Qiaozhen Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title | Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title_full | Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title_fullStr | Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title_full_unstemmed | Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title_short | Inertial imitation method of MMC with hybrid topology for VSC-HVDC |
title_sort | inertial imitation method of mmc with hybrid topology for vsc-hvdc |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9733882/ https://www.ncbi.nlm.nih.gov/pubmed/36490297 http://dx.doi.org/10.1371/journal.pone.0277553 |
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