Title :
A novel robust nonlinear control of a three-phase NPC inverter based Active Power Filter
Author :
Okou, F.A. ; Gauthier, S.
Author_Institution :
R. Mil. Coll. of Canada, Kingston, ON, Canada
fDate :
June 30 2010-July 2 2010
Abstract :
This paper presents a three-level three-phase diode clamped inverter that uses an auxiliary circuit to equalize its DC-bus capacitor voltages. The proposed converter is used in an Active Power Filter (APF) and a controller is designed for this new APF. A state space model of this filter is obtained first. Three single input single output (SISO) robust controllers are designed to compensate the load current harmonics, to regulate the DC-bus voltage and to equalize the capacitor voltages. The effectiveness of this control strategy is guaranteed by the fact that each of the SISO controllers is provided with appropriate nonlinear terms that compensate the interactions among the filter sub-modules. The APF performance is evaluated. The results demonstrate that load current harmonics are very well compensated, the converter DC-bus voltage is maintained at its reference value and capacitor voltages remain equal despite load variations.
Keywords :
active filters; control system synthesis; invertors; nonlinear control systems; power convertors; power harmonic filters; robust control; voltage control; DC-bus capacitor voltages; active power filter; auxiliary circuit; filter sub-modules; load current harmonics; load variations; robust nonlinear control; single input single output robust controllers; state space model; three-level three-phase diode clamped inverter; three-phase NPC inverter; Active filters; Capacitors; Circuits; Diodes; Inverters; Load management; Power harmonic filters; Robust control; State-space methods; Voltage control;
Conference_Titel :
American Control Conference (ACC), 2010
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-7426-4
DOI :
10.1109/ACC.2010.5531489
