Harmonic State-Space Based AC-Side Impedance Model of MMC and High Frequency Oscillation Characteristics Analysis  

作　　者：Hui Fang Jingsen Zhou Haozheng Wang Yanxu Wang Hongji Xiang Yechun Xin 

机构地区：[1]State Grid Chongqing Electric Power Company Research Institute,Chongqing,401120,China [2]Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University),Jilin,132012,China

出　　处：《Energy Engineering》2023年第4期831-849,共19页能源工程（英文）

基　　金：supported by Research on the Oscillation Mechanism and Suppression Strategy of Yu-E MMC-HVDC Equipment and System(2021Yudian Technology 33#).

摘　　要：Recently,high-frequency oscillation of themodularmultilevel converter(MMC)based high-voltage direct current(HVDC)projects has attracted great attentions.In order to analyze the small-signal stability,this paper uses the harmonic state-space(HSS)method to establish a detailed frequency domain impedance model of the AC-side of the HVDC transmission system,which considers the internal dynamic characteristics.In addition,the suggested model is also used to assess the system’s high-frequency oscillationmechanism,and the effects of the MMC current inner loop control,feedforward voltage links,and control delay on the high-frequency impedance characteristics and the effect of higher harmonic components.Finally,three oscillation suppression schemes are analyzed for the oscillation problems occurring in actual engineering,and a simplified impedance model considering only the highfrequency impedance characteristics is established to compare the suppression effect with the detailed impedance model to prove its reliability.

关 键 词：Modular multilevel converter impedance modeling small-signal stability suppression strategy 

分 类 号：O17[理学—数学]