Sliding‐mode variable structure controller for cascade STATic var COMpensator. Issue 2 (1st February 2013)

• Record Type: Journal Article
• Authors: Wu, Junyong; Chen, Qichao; Du, Mingjun; Yu, Shuqin
• Is Part Of: IET power electronics. Volume 6:Issue 2(2013)
• Page Start: 343
• Page End: 352
• Publication Date: 2013-02-01
• Subjects: control system synthesis -- electric current control -- feedback -- linear systems -- phase control -- position control -- power supply quality -- static VAr compensators -- time‐varying systems -- variable structure systems -- voltage control; sliding‐mode variable structure controller -- cascade static var compensator -- versatile STATCOM controller -- direct feedback linearisation control -- individual phase instantaneous current tracking control -- distribution system conditions -- degree of system unbalance -- switching function design -- voltage sag -- asymmetrical condition -- hierarchical DC‐link voltages balance control strategy -- PSCAD‐EMTDC; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2012.0220
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : The authors propose a novel sliding‐mode variable structure controller for cascade STATic var COMpensator (STATCOM), which integrates the direct feedback linearisation control for the balanced system and the individual phase instantaneous current tracking control for the unbalanced system, to achieve a versatile STATCOM controller. It can adapt automatically to various distribution system conditions. Based on the degree of system unbalance, the authors design a switching function to make the STATCOM work reliably with satisfactory performance, when the serious voltage sag occurs or the distribution system enters serious asymmetrical condition. The authors also propose a hierarchical DC‐link voltages balance control strategy. The authors build a detailed ± 10 MVar STATCOM model with power system CAD and electro magnetic transient in DC system (PSCAD/EMTDC) and validate the effectiveness and advantage of the proposed control strategy with the simulation study.