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Digital controller for hybrid filter in HVDC based on approximate inverse system |
| SU Ling1, CHEN Jian-ye1, WANG Zan-ji1, ZHAO Dong-yuan2 |
| 1.Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; 2.Electric Power Research Institute, Beijing 100085, China |
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Abstract 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.
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Issue Date: 05 December 2006
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