Dual current control scheme for PWM converter under unbalanced input voltage conditions
SCIE
SCOPUS
- Title
- Dual current control scheme for PWM converter under unbalanced input voltage conditions
- Authors
- Song, HS; Nam, K
- Date Issued
- 1999-10
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- Voltage unbalance in a three-phase system causes performance deterioration of a pulsewidth modulation (PWM) converter by producing the 120-Hz voltage ripples in the de link and by increasing the reactive power. To eliminate the de-link voltage ripple and the de component of the reactive power, both positive- and negative-sequence currents should be controlled simultaneously, according to the paper by Rioual et al. We used two synchronous reference frames: a positive-sequence current regulated by a proportional integral (PI) controller in a positive synchronous reference frame (SRF), and a negative-sequence current regulated by a PI controller in a negative SRF, In the positive SRF, which rotates counterclockwise, the positive sequence appears as de, while the negative sequence appears as 120 Hz, In contrast, in the negative SRF, which rotates clockwise, the negative sequence appears as de, while the positive sequence appears as 120 Hz. By deleting 120-Hz components using a notch filter in each SRF, one can measure positive- and negative-sequence currents separately, and use them for constructing two feedback controllers. Since the negative-sequence current is also controlled in its own SRF by a de command, this approach yields better performance without increasing the control gain. Note that, since the controller is implemented by a software routine in the digital signal processor chip, using two SRF's does not require additional hardware. We demonstrated the effectiveness of the proposed control scheme by using computer simulation and experiments.
- Keywords
- current control; dual control scheme; pulsewidth modulation power converters; rectifiers; symmetrical components; synchronous frame control scheme; voltage unbalance; RECTIFIER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20253
- DOI
- 10.1109/41.793344
- ISSN
- 0278-0046
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 46, no. 5, page. 953 - 959, 1999-10
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.