Stability of DC voltage droop controllers in VSC HVDC systems

Author

Thams, Florian ; Suul, Jon Are ; D´Arco, Salvatore ; Molinas, Marta ; Fuchs, Friedrich Wilhelm

Author_Institution

Department of Electric Power Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

fYear

2015

fDate

June 29 2015-July 2 2015

Firstpage

1

Lastpage

7

Abstract

Future multi-terminal HVDC systems are expected to utilize dc voltage droop controllers and several control implementations have been proposed in literature. This paper first classifies possible dc droop implementations in a simple framework. Then, the small-signal stability of a VSC-based converter station is analyzed for all the identified droop control schemes. The stability range for the system is determined as a function of the droop gain and is used to compare the flexibility and robustness of the implementations. The comparisons reveal that the droop implementations based on the ac current and dc voltage achieve a wider stability region than the other schemes and a limited sensitivity to the droop gain.

Keywords

Circuit stability; Eigenvalues and eigenfunctions; HVDC transmission; Power system stability; Sensitivity; Stability analysis; Voltage control; DC voltage droop control; VSC HVDC systems; power transfer capability; stability;

fLanguage

English

Publisher

ieee

Conference_Titel

PowerTech, 2015 IEEE Eindhoven

Conference_Location

Eindhoven, Netherlands

Type

conf

DOI

10.1109/PTC.2015.7232614

Filename

7232614