Study on System Operation Characteristics of UHVDC Under Hierarchical Connection Mode. Issue 1 (January 2020)

• Record Type: Journal Article
• Authors: Wang, Weiyuan; Cheng, Jinmin; Ren, Ziyuan
• Is Part Of: IOP conference series. Volume 740:Issue 1(2020)
• Publication Date: 2020-01
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/740/1/012107
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: In order to effectively solve the problem of voltage support in receiving end of the multi-infeed DC system, the UHVDC connected to AC network under hierarchical connection mode is proposed. In this paper, the simulation model of UHVDC considering interlayer coupling is set up by PSCAD/EMTDC electromagnetic transient simulation software. The difference of AC system strength between hierarchical connection mode and traditional connection mode is compared. The variation characteristics of the effective interlayer short circuit ratio of the hierarchical connection AC system under different coupling strengths are simulated. By studying the influence law of the interlayer impedance on the steady-state system operation characteristics and the system commutation failure characteristics after the fault, the interaction between the different AC systems of the inverter side is analysed. The results of this paper can provide theoretical support for the operation stability of UHVDC hierarchical connection mode transmission system.