Title :
Inverter DC-link stabilizing control with improved voltage sag ride-through capability
Author :
Harnefors, Lennart ; Pietiläinen, Kai
Author_Institution :
ABB Power Technol.
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;
Conference_Titel :
Power Electronics and Applications, 2005 European Conference on
Conference_Location :
Dresden
Print_ISBN :
90-75815-09-3
DOI :
10.1109/EPE.2005.219553
