CSEE Journal of Power and Energy Systems  

作　　者：Xiangyu Pei Caoyang Jia Feng Ji Hui Pang Guangfu Tang 

机构地区：[1]State Key Laboratory of Disaster Prevention&Reduction for Power Gird,Changsha University of Science&Technology,Changsha 410114,China [2]Beijing Huairou Laboratory,Beijing 101400,China [3]State Key Laboratory of Advanced Power Transmission Technology,China Electric Power Research Institute Co.,Ltd.,Beijing 100192,China [4]Beijing Huairou Laboratory,Beijing 100084,China

出　　处：《CSEE Journal of Power and Energy Systems》2025年第2期481-489,共9页中国电机工程学会电力与能源系统学报(英文)

基　　金：supported by the National NaturalScience Foundation of China (No. 52277075), and Postgraduate ScientificResearch Innovation Project of Changsha University of Science & Technology(No. CSLGCX23062).

摘　　要：Large-scale renewable energy transmission via thevoltage source converter (VSC) based high-voltage direct current(HVDC) is a crucial development direction for constructing anew-typed power system in China. However, renewable energy ischaracterized by volatility, intermittency, and randomness. Whenthe sending-end modular multilevel converter (MMC) cannotadapt to the rapid fluctuations in renewable energy output, itsenergy balance will be disrupted by the active power differencebetween the AC and DC sides, causing issues such as widebandoscillations and exacerbated circulating currents. To solve theproblem mentioned above, a novel energy balance-based controlmethod for MMCs connected to wind farms is proposed in thispaper, enabling the MMC to effectively adapt to fluctuationsin renewable energy output and naturally maintain circulatingcurrent at a relatively low level. Firstly, the evolution principleillustrating topology decomposition and reconfiguration of theMMC is revealed. Secondly, the control method for AC internalvoltage is proposed, which combines the energy balance betweenthe half MMCs and voltage amplitude support. Thirdly, the DCinternal voltage is defined, and its control method is proposedbased on the MMC’s overall energy balance. Then, independentcontrol of each bridge arm is achieved by integrating the energybalance of the bridge arms with both the AC and DC internalvoltages. Finally, an electromagnetic transient simulation modelis built with PSCAD/EMTDC, and the efficacy and practicalityof the proposed method are demonstrated through extensivesimulation experiments.

关 键 词：DC current control energy balance control renewable energy VSC-based HVDC system 

分 类 号：TM721[电气工程—电力系统及自动化]