Analysis of unbalanced clustered voltage and control strategy of clustered voltage balancing for cascaded H-bridge STATCOM

作     者：Yu JIN Jianze WANG Yiqi LIU Xinagyu SAI Yanchao JI 

作者机构：School of Electrical Engineering and AutomationHarbin Institute of TechnologyHarbinChina College of Mechanical and Electrical EngineeringNortheast Forestry UniversityHarbinChina 

出 版 物：《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报（英文）)

年 卷 期：2019年第7卷第6期

页      面：1697-1708页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 0807[工学-动力工程及工程热物理] 

主　　题：Cascaded static synchronous compensator(STATCOM) Clustered voltage Control strategy Negative-sequence current Zero-sequence voltage 

摘      要：To explore the clustered voltage balancing mechanism of the cascaded H-bridge static synchronous compensator(STATCOM),this paper analyzes the causes of unbalanced clustered *** negative-sequence current caused by the compensation of unbalanced reactive power or detection and control errors and the zero-sequence voltage caused by voltage drift of the STATCOM neutral point contribute to unbalanced clustered *** this basis,this paper proposes a control strategy to inject negative-sequence current and zero-sequence voltage *** injection of negative-sequence current may cause current asymmetry in the grid,and the zerosequence injection has a relatively limited balancing ability in the clustered *** proposed control strategy can not only generate a faster balancing response than the traditional zero-sequence voltage injection method,but also lower the extent of current asymmetry compared with the traditional negative-sequence current injection ***,the negative-sequence current and zero-sequence voltage injection are further transformed into the dq frame to establish a unified *** effectiveness of the proposed control strategy is verified by the simulation and experimental results.