Impedance-based stability assessment of parallel VSC HVDC grid connections

Author

Bayo-Salas, A. ; Beerten, J. ; Rimez, J. ; Van Hertem, D.

Author_Institution

Elia Syst. Operator, Brussels, Belgium

fYear

2015

fDate

10-12 Feb. 2015

Firstpage

1

Lastpage

9

Abstract

The number of converters connected to the system is likely to be increased. These devices may interact with each other through the network. TSOs are concerned about the impact of these interactions and its influence on the stability. This paper presents the stability analysis of a system with two converters. The problem is studied in the frequency domain by using an impedance-based approach. A model for assessing the closed-loop stability of the complete system is developed. This approach shows to have potential for studying the interactions in larger networks. The relative stability under different grid parameters is addressed. Simulation results show that the stability is compromised when a parallel converter is connected.

Keywords

HVDC power convertors; power grids; TSO; closed-loop stability; converters; grid parameters; impedance-based approach; impedance-based stability assessment; parallel VSC HVDC grid connections; parallel converter; stability analysis; Impedance-based analysis; Stability study; VSC HVDC; control interactions;

fLanguage

English

Publisher

iet

Conference_Titel

AC and DC Power Transmission, 11th IET International Conference on

Conference_Location

Birmingham

Print_ISBN

978-1-84919-982-7

Type

conf

DOI

10.1049/cp.2015.0087

Filename

7140569