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More and more renewable energy is incorporated into the power system through power electronic equipment, resulting in reduced system strength and physical inertia. This paper proposes a grid-forming control strategy for modular multilevel converter based high voltage direct current transmission system (MMC-HVDC) with MMC internal energy control which is connected with a weak AC system. Firstly, based on the droop grid-forming control,, inertia link and PI control are added, so that MMC can automatically track the load fluctuation and adjust its own power output, and realize zero steady-state error regulation of AC voltage and frequency. Then, aiming at the problem of internal energy fluctuation of MMC controlled by grid-forming control, a MMC internal energy compensation controller is designed, which can effectively reduce fluctuation of DC voltage of submodule capacitance. Finally, based on the PSCAD/EMTDC electromagnetic transient simulation platform, a MMC-HVDC transmission system was established, and two operating conditions of AC grid load increase and AC grid load reduction are selected to verify the feasibility and effectiveness of the proposed control strategy.

, authors=Yingpei Liu, Dongqing Sun, authorsList=Yingpei Liu, Dongqing Sun, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1309639350133023334, articleId=1309639346081325668, tenantId=1146029695717560320, journalId=1146119893612605453, language=CN, title=MMC-HVDC系统MMC内部能量控制的组网控制策略, columnId=null, journalTitle=可再生能源, columnName=, runingTitle=null, highlight=null, articleAbstract=

针对可再生能源通过电力电子设备并入电力系统，导致电网系统强度减弱、物理惯性降低的问题，文章提出一种适用于柔性直流输电（Modular Multilevel Converter Based High Voltage Direct Current, MMC-HVDC）连接弱交流系统MMC内部能量控制的组网控制策略。在下垂组网控制的基础上，加入惯性环节和PI控制环节，使得MMC能够自动跟踪负荷变化调整自身功率输出，实现对交流电压和频率的无差调节。针对组网控制的MMC内部能量波动较大的问题，设计了一种MMC内部能量补偿控制策略，该策略能够有效降低子模块电容电压波动。最后，基于PSCAD/EMTDC电磁暂态仿真平台建立MMC-HVDC系统，并选取交流系统负荷增加、负荷减少两种工况，验证了所提控制策略的可行性和有效性。

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刘英培（1982-），女，博士，副教授，研究方向为直流输电、直流配电技术、新能源发电与并网技术。E-mail: liuyingpei_123@126.com

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刘英培（1982-），女，博士，副教授，研究方向为直流输电、直流配电技术、新能源发电与并网技术。E-mail: liuyingpei_123@126.com

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