Virtual control method applied to Modular Multilevel Converter

The DC transformer based on the Modular Multilevel Converter (MMC) structure has the advantages of robust scalability, low output voltage harmonic content, easy realization of back-to-back connection, and high power transmission efficiency. It is widely used in DC distribution networks. However, tra...

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Autores principales:	Zitao Zhang, Chuyang Wang, Yang Xu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	DC microgrid Virtual inertia Modular multilevel DC transformer Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/025df3f63f69473db727e504bc1528bc
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spelling	oai:doaj.org-article:025df3f63f69473db727e504bc1528bc2021-12-04T04:34:59ZVirtual control method applied to Modular Multilevel Converter2352-484710.1016/j.egyr.2021.11.099https://doaj.org/article/025df3f63f69473db727e504bc1528bc2022-04-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721012440https://doaj.org/toc/2352-4847The DC transformer based on the Modular Multilevel Converter (MMC) structure has the advantages of robust scalability, low output voltage harmonic content, easy realization of back-to-back connection, and high power transmission efficiency. It is widely used in DC distribution networks. However, traditional control methods hardly provide inertia for the DC distribution network, thereby reducing the stability of the distribution network when new energy output fluctuations, DC distribution network failures, or other disturbances occur. Aiming at the problem that the DC bus voltage is easily affected by power fluctuations, the paper proposes a virtual inertia control method applied to the DC transformer with MMC structure. Similar to the introduction of virtual synchronous generators in the AC distribution network to enhance the system inertia, the paper designs a control strategy for dynamically adjusting the virtual inertia with a virtual capacitor added, which is based on the traditional two-phase shift control. The paper also presents the calculation method of the virtual capacitance. When the power in the DC microgrid fluctuates significantly, the strategy can effectively enhance the inertia of the DC distribution network and suppress the voltage fluctuation of the DC bus. The paper finally establishes a DC distribution network model with distributed power sources in the PLECS simulation software, and verifies the effectiveness of the control strategy compared with the traditional strategy.Zitao ZhangChuyang WangYang XuElsevierarticleDC microgridVirtual inertiaModular multilevelDC transformerElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 8, Iss , Pp 248-256 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	DC microgrid Virtual inertia Modular multilevel DC transformer Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	DC microgrid Virtual inertia Modular multilevel DC transformer Electrical engineering. Electronics. Nuclear engineering TK1-9971 Zitao Zhang Chuyang Wang Yang Xu Virtual control method applied to Modular Multilevel Converter
description	The DC transformer based on the Modular Multilevel Converter (MMC) structure has the advantages of robust scalability, low output voltage harmonic content, easy realization of back-to-back connection, and high power transmission efficiency. It is widely used in DC distribution networks. However, traditional control methods hardly provide inertia for the DC distribution network, thereby reducing the stability of the distribution network when new energy output fluctuations, DC distribution network failures, or other disturbances occur. Aiming at the problem that the DC bus voltage is easily affected by power fluctuations, the paper proposes a virtual inertia control method applied to the DC transformer with MMC structure. Similar to the introduction of virtual synchronous generators in the AC distribution network to enhance the system inertia, the paper designs a control strategy for dynamically adjusting the virtual inertia with a virtual capacitor added, which is based on the traditional two-phase shift control. The paper also presents the calculation method of the virtual capacitance. When the power in the DC microgrid fluctuates significantly, the strategy can effectively enhance the inertia of the DC distribution network and suppress the voltage fluctuation of the DC bus. The paper finally establishes a DC distribution network model with distributed power sources in the PLECS simulation software, and verifies the effectiveness of the control strategy compared with the traditional strategy.
format	article
author	Zitao Zhang Chuyang Wang Yang Xu
author_facet	Zitao Zhang Chuyang Wang Yang Xu
author_sort	Zitao Zhang
title	Virtual control method applied to Modular Multilevel Converter
title_short	Virtual control method applied to Modular Multilevel Converter
title_full	Virtual control method applied to Modular Multilevel Converter
title_fullStr	Virtual control method applied to Modular Multilevel Converter
title_full_unstemmed	Virtual control method applied to Modular Multilevel Converter
title_sort	virtual control method applied to modular multilevel converter
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/025df3f63f69473db727e504bc1528bc
work_keys_str_mv	AT zitaozhang virtualcontrolmethodappliedtomodularmultilevelconverter AT chuyangwang virtualcontrolmethodappliedtomodularmultilevelconverter AT yangxu virtualcontrolmethodappliedtomodularmultilevelconverter
_version_	1718372949990309888

Virtual control method applied to Modular Multilevel Converter

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