Title :
Nonlinear decoupled control of back-to-back voltage source converter
Author :
Gan-Gui, Yan ; Gui-qiang, Jiang ; Gang, MU ; Jun-hui, Li ; Tao, Chen ; Ya-feng, Huang ; Jian, Wang
Author_Institution :
Northeast Dianli Univ., Jilin
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
A dynamic model of back-to-back voltage source converter under synchronous rotating d-q coordinate system is developed. The system is transformed to a new equivalent nonlinear system which consists of a linear decoupled subsystem and a nonlinear subsystem characterizing the dynamics of the dc-link voltage in terms of the state variables in the linear subsystem via the feedback linearization technique. Then a decoupled controller which consists of an outer loop for determination of d- and q-axis components of reference currents and an inner loop for tracking the reference currents is designed for active and reactive power exchange control between the VSC and the two ac systems. The validity of the proposed controller is demonstrated by the simulation results under electromagnetic software PSCAD/EMTDC and experimental results on a 30 kVA/380 V prototype system, respectively.
Keywords :
linearisation techniques; nonlinear control systems; power control; power convertors; back-to-back voltage source converter; feedback linearization technique; nonlinear decoupled control; power exchange control; synchronous rotating d-q coordinate system; Control systems; Converters; Electric variables control; Linearization techniques; Nonlinear dynamical systems; Nonlinear systems; Reactive power control; State feedback; Tracking loops; Voltage control;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746002