Control-oriented modeling and robust control of a three-phase buck+boost PWM rectifier (VRX-4)

Author

Nussbaumer, T. ; Gong, G. ; Heldwein, M.L. ; Kolar, J.W.

Author_Institution

Power Electron. Syst. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland

Volume

1

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

169

Abstract

The modeling and control of a three-phase, three-switch buck-type rectifier system with integrated boost output stage (VRX-4) is analyzed in this paper. A cascaded multi-loop control structure is presented that has the following features: constant output voltage for a wide input voltage range and step-wise changes of load; sinusoidal input currents in phase with the mains voltages that also remain sinusoidal in case of asymmetric mains conditions; and active damping of the input filter resonance. For the control design an equivalent DC-DC small-signal model of the converter is derived and verified by simulations and measurements. Based on this and the identification of the critical operating point the controllers for the inner DC current and outer voltage control loops are selected The stability of the closed loop system is discussed and the robust operation of the system is verified by measurements on a 5 kW prototype.

Keywords

DC-DC power convertors; PWM power convertors; PWM rectifiers; cascade control; closed loop systems; electric current control; filters; robust control; voltage control; 5 kW; DC current controller; DC-DC converter; VRX-4; active damping; boost PWM rectifier; cascaded multi-loop control structure; closed loop system; control-oriented modeling; input filter resonance; integrated boost output stage; robust control; sinusoidal input current; small-signal model; three-phase buck PWM rectifier; voltage control loop; Control design; DC-DC power converters; Damping; Filters; Pulse width modulation; Rectifiers; Resonance; Robust control; Robust stability; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518307

Filename

1518307