Research on power flow calculation method of true bipolar VSC-HVDC grids with different operation modes and control strategies. (March 2021)

• Record Type: Journal Article
• Authors: Li, Botong; Wang, Wenxin; Liu, Yichao; Li, Bin; Wen, Weijie
• Is Part Of: International journal of electrical power & energy systems. Volume 126(2021)Part A
• Publication Date: 2021-03
• Subjects: Converter station loss -- Layer-based power flow calculation method -- Station-level control strategy -- True bipolar VSC-HVDC grid; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2020.106558
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: This method aims at the power flow calculation for the grids with the metal-return line. This method is suitable for power flow calculation with the asymmetric operation. Power flow can be calculated with high accuracy with different control strategies. Abstract: Compared with the pseudo bipolar Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) (VSC-HVDC) grid, the true bipolar VSC-HVDC grid with series voltage source converters is more flexible and reliable. Based on the analysis of structure and power distribution in the true bipolar VSC-HVDC grid, the node admittance matrices and a representation method of the converter station losses are first derived. Then, with various station-level control strategies of VSC taken into account, a layer-based power flow calculation method suitable for true bipolar VSC-HVDC grids in both symmetric and asymmetric operation is proposed. Finally, the applicability and accuracy of the proposed power flow calculation method are verified by a true bipolar VSC-HVDC grid model built in PSCAD.