Analysis on the control principle of the active DC filter in theLindome converter station of the Konti-Skan HVDC link

摘要

The control principle of a hybrid passive-active DC filterninstalled in the Lindome HVDC converter station is analyzed in thisnpaper. The controller of the active filter includes two basic functions:nan integrator and a compensator. The main advantage of the Lindomencontroller is its simple structure for implementation in a digitalnsignal processor (DSP). The drawbacks of this controller are its longnresponse time, low stability margin and the filtering of an unnecessarynnumber of frequencies. An alternative control strategy using a number ofnnotch filters has been investigated. The notch filters can be tuned tonthose frequencies that need to be damped. This controller gives a muchnshorter system response time and improved stability margin