Control strategy for 2-terminal high power LCL DC-DC converter

Author

Weixing Lin ; Jovcic, Dragan

Author_Institution

Sch. of Eng., Univ. of Aberdeen, Aberdeen, UK

fYear

2013

fDate

21-25 July 2013

Firstpage

1

Lastpage

5

Abstract

This paper proposes a control strategy for 2-terminal LCL DC-DC converter. Cascaded control consists of outer loop power control, with inner loop current control in order limit converter currents. Three coordinate frames are used in order to satisfy zero reactive current at each bridge and power balance. The control strategy enables the 2-terminal LCL DC-DC converter operating in the whole range of the designed power rating and current limitation during faults. Operating principles of the LCL DC-DC converter and procedures for design the control strategy are presented. Effectiveness of the control strategy during step power orders and DC faults is verified by simulation of a detailed PSCAD model for a 200kV/640kV, 500MW 2-terminal LCL DC-DC converter.

Keywords

DC-DC power convertors; electric current control; power control; cascaded control; control strategy; high power LCL DC DC converter; inner loop current control; outer loop power control; power 500 MW; power balance; voltage 200 kV; voltage 640 kV; zero reactive current; Bridge circuits; Circuit faults; Educational institutions; Equations; Reactive power; Topology; Voltage control; DC grids; DC-DC power conversion; IGBT converter; current control; high voltage DC transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting (PES), 2013 IEEE

Conference_Location

Vancouver, BC

ISSN

1944-9925

Type

conf

DOI

10.1109/PESMG.2013.6672677

Filename

6672677