Mechanism Analysis of Additional Damping Control Strategies for the High-frequency Resonance of MMC Connected to AC Grid  

作　　者：Yanqi Hou Chongru Liu Yu Wang Wei Kong 

机构地区：[1]State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China [2]State Grid Economic and Technological Research Institute Co.Ltd.,Beijing 102209,China [3]State Grid Corporation of China,Beijing 100031,China

出　　处：《CSEE Journal of Power and Energy Systems》2023年第3期1173-1181,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 in part by Science and Technology Project of State Grid Corporation of China,“Research on Harmonic Oscillation Problems;Suppression Strategies of Flexible DC Connected to AC Grid”,(No.SGTYHT/17-JS-199).

摘　　要：High-frequency resonance can occur when a modular multilevel converter(MMC)is inserted into an AC grid.Additional damping control is a relatively low-cost resonance suppression strategy compared to passive damping strategies.This paper analyzes the influences of a feed-forward voltage filter and feedback current filter for the inner controller for the high-frequency impedance characteristics of the MMC based on a model.Moreover,the mechanism,influencing factors,and limitations of the existing strategy including an additional lowpass filter in the voltage feed-forward stage are investigated.Secondly,a resonance suppression strategy for the inclusion of additional cascaded notch filters in the voltage feed-forward stage is proposed,and its parameter design method and applicable scenarios are analyzed.In addition,this paper analyzes the effects of the inclusion of an additional control in other stages for the inner controller of the MMC.Finally,the correctness of the theoretical analysis and the proposed strategy is verified based on the simulation of an actual project on PSCAD/EMTDC.

关 键 词：Additional damping control strategy additional cascaded notch filters additional low-pass filter modular multilevel converter(MMC) high-frequency resonance 

分 类 号：TM46[电气工程—电器]