No abstract

No abstract

No abstract

Innovative solutions with HVDC (High Voltage Direct Current) and FACTS (Flexible AC Transmission Systems)have the potential to cope with the system planning and operational challenges of global climate developments and the call for changes in the way electricity is supplied. New power electronic technologies with self-commutated converters make advanced technical features possible, such as independent control of active and reactive power, and the capability to supply weak or passive networks. As part of the overall planning considerations, this paper presents the fundamental system planning, modeling and operational challenges of connecting large wind farms (both onshore and offshore) via long transmission systems, as well as the practical applications of traditional and new power electronic technologies.

No abstract

No abstract

No abstract

In this perper. ci non-linear control scheme fiw tile TCSC (thyristor-c~ontrollecl series compensator) to deimpen power oscillations and to improve the trcinsient stability of power systems is presentecl. Based on an one-mcichirze-irifnite-btis system, CI non-linear mrithematiccil model is estciblished which is proven as an ciflnr nonlinenr system. With the help of the feeclbtick 1ineriri:ation technique, the ctffine non-linear model is e.ractly tninsferred to a linecir moclel, and then the control scheme is designeclfor the TCSC based on the global linearizcition, where the input signeil uses local meeisrirements onlv. The e~j+ctivene.s.s ant1 roblrstness of the proposed non-linecir control scheme nre detnmn.strcitetl with cin one-mtdiine test svstem, where the TCSC modell i t i s cind power system simtilations Lire perfr,rmecl by itsing the progrcitn system NETOMAC. I n compeiriwn with ( I conventioncrl control scheme. significtint improvements of clwomiccil performnnce in the test power ' sv.stem (ire cichieved bv the proposeel non-lineor control strcitegy fiw the TCSC.