%A SU Ling, CHEN Jian-ye, WANG Zan-ji, ZHAO Dong-yuan %T Digital controller for hybrid filter in HVDC based on approximate inverse system %0 Journal Article %D 2006 %J Front. Electr. Electron. Eng. %J Frontiers of Electrical and Electronic Engineering %@ 2095-2732 %R 10.1007/s11460-006-0070-8 %P 367-370 %V 1 %N 4 %U {https://journal.hep.com.cn/fee/EN/10.1007/s11460-006-0070-8 %8 2006-12-05 %X In order to eliminate the characteristic harmonics in high voltage direct current (HVDC) transmission systems and to simplify the analog controller structure, this paper proposes a new digital controller by adopting an approximate inverse system control strategy according to the frequency response characteristic of the hybrid power filter. The proposed digital controller is implemented with a TMS320C32 DSP, including a series of parallel digital band-pass filters, phase shifters and amplifiers. The results of both simulations based on PSCAD and experiments on a 30 kVA HVDC system prove that the proposed digital control system is stable and efficient for eliminating the harmonics.