Dept. of Electr. Eng., National Taiwan Univ.Wang, L.L.WangYUAN-YIH HSU2007-04-192018-07-062007-04-192018-07-061989-0301437046http://ntur.lib.ntu.edu.tw//handle/246246/2007041910042728https://www.scopus.com/record/display.uri?eid=2-s2.0-0024620398&origin=resultslist&sort=plf-f&src=s&st1=10.1049%2fip-c.1989.0013&sid=7e5b277c6e243948bbf95b4f7db447ea&sot=b&sdt=b&sl=27&s=DOI%2810.1049%2fip-c.1989.0013%29&relpos=0&citeCnt=61&searchTerm=A novel control scheme is presented for the design of a supplementary subsynchronous damping controller (SSDC) equipped at the rectifier end of an hv dc link that is connected in parallel with an existing resonating ac line. To stabilize the unstable subsynchronous resonance (SSR) modes, an appraoch based on modal control theory is developed for the design of the SSDC. Since the synchronous oscillations resulting from high levels of compensation on the ac line can be damped out, the power transfer capability of the ac line can be enhanced by the proposed SSDC. The SSDC can also be used to increase the damping of torsional interaction between the hv dc link and turbine generator, thereby qualifying the hv dc link equipped with the proposed SSDC as an alternative to a new, second ac line where long distances of transmission may economically justify the use of an hv dc line.application/pdf660349 bytesapplication/pdfen-USControl systems; Electric lines; AC Line; Damping Controller; HV DC Link; Model Control; Subsynchronous Oscillations; Electric power transmission, HVDCjournal article10.1049/ip-c.1989.00132-s2.0-0024620398http://ntur.lib.ntu.edu.tw/bitstream/246246/2007041910042728/1/00020224.pdf