Inverter DC-link stabilizing control with improved voltage sag ride-through capability

Author

Harnefors, Lennart ; Pietiläinen, Kai

Author_Institution

ABB Power Technol.

fYear

2005

fDate

11-14 Sept. 2005

Abstract

Previously published results concerning instability of the DC link in inverter drives fed from a DC grid or via a rectifier are extended in this paper. It is shown that rectifier-inverter drives equipped with small (film) DC-link capacitors may need active stabilization. The impact of limited bandwidth and switching frequency in the inverter-motor current control loop is considered. Recommendations for selection of the DC-link capacitor, the switching frequency, and the DC-link stabilization control law in relation to each other are given. The control law is incorporated in a previously proposed current controller, which is designed for good voltage sag ride-through capability

Keywords

control system synthesis; electric current control; invertors; machine control; motor drives; power capacitors; power grids; power supply quality; rectifying circuits; stability; switching convertors; DC grid; DC-link capacitors; active stabilization; current controller; inverter DC-link stabilizing control; inverter-motor current control loop; rectifier-inverter drives; switching frequency; voltage sag ride-through capability; Bandwidth; Capacitors; Current control; Damping; Power system stability; Pulse width modulation inverters; Rectifiers; Switching frequency; Voltage control; Voltage fluctuations; Converter control; active damping; drive; induction motor; voltage sag compensators;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Applications, 2005 European Conference on

Conference_Location

Dresden

Print_ISBN

90-75815-09-3

Type

conf

DOI

10.1109/EPE.2005.219553

Filename

1665743