The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Feed-Forward Compensation Technique in Stationary Reference Frame for the Enhanced Disturbance Rejection Performance in Parallel Operation of Double-Conversion UPSs

이중 변환 UPS의 병렬 운전 시 외란 저감 성능 향상을 위한 정지 좌표계 상의 전향 보상 기법

  • Ryu, Hyo-Jun (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Yoon, Young-Doo (Dept. of Automotive Engineering, Hanyang University) ;
  • Mo, Jae-Sung (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Choi, Seung-Cheol (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University) ;
  • Woo, Tae-Gyeom (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University)
  • Received : 2022.01.30
  • Accepted : 2022.03.24
  • Published : 2022.10.20
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Abstract

Generally, a proportional-resonant controller is used to eliminate steady-state errors during the voltage-current control of a double-conversion uninterruptible power supply (UPS) in a stationary reference frame. Additionally, the feed-forward control compensating for the load current, which can be considered a disturbance of the voltage controller, can be used to improve the disturbance rejection performance. However, during the parallel operation of UPSs, circulating current can occur between UPS modules when performing both feed-forward control and droop control because feed-forward control reduces the circulating current impedance. This study proposes a feed-forward compensation technique that considers the impedance of circulating current. An additional feed-forward compensation technique is developed to enhance the disturbance rejection performance. The validity of the proposed feed-forward compensation technique is verified by the experiment results of the parallel operation of a 500 W double-conversion UPS module.

Keywords

Acknowledgement

본 논문은 2022년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원(KIAT)의 지원을 받아 수행된 연구임 (P0017120, 2022년 산업혁신인재성장지원사업)

References

  1. M. Aamir and S. Mekhilef, "An online transformerless uninterruptible power supply (UPS) system with a smaller battery bank for low-power applications," in IEEE Transactions on Power Electronics, Vol. 32, No. 1, pp. 233-247, Jan. 2017. https://doi.org/10.1109/TPEL.2016.2537834
  2. F. Mardani, N. Falconar, N. Shafiei, N. Akel, R. Khandekar and M. Pahlevani, "A digital control system for UPS systems with smart-grid capability," in IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 8, No. 4, pp. 3846-3860, Dec. 2020. https://doi.org/10.1109/JESTPE.2019.2938209
  3. J. M. Guerrero, L. Hang and J. Uceda, "Control of distributed uninterruptible power supply systems," in IEEE Transactions on Industrial Electronics, Vol. 55, No. 8, pp. 2845-2859, Aug. 2008. https://doi.org/10.1109/TIE.2008.924173
  4. J. M. Guerrero, Luis Garcia de Vicuna, J. Matas, M. Castilla and J. Miret, "Output impedance design of parallel-connected UPS inverters with wireless load-sharing control," in IEEE Transactions on Industrial Electronics, Vol. 52, No. 4, pp. 1126-1135, Aug. 2005. https://doi.org/10.1109/TIE.2005.851634
  5. C. Zhang, J. M. Guerrero, J. C. Vasquez and E. A. A. Coelho, "Control architecture for parallel-connected inverters in uninterruptible power systems," in IEEE Transactions on Power Electronics, Vol. 31, No. 7, pp. 5176-5188, Jul. 2016.
  6. Hong-Seok Song and Kwanghee Nam, "Dual current control scheme for PWM converter under unbalanced input voltage conditions," in IEEE Transactions on Industrial Electronics, Vol. 46, No. 5, pp. 953-959, Oct. 1999. https://doi.org/10.1109/41.793344
  7. Remus Teodoresc, Marco Liserre, Pedro Rodriguez, "Control of grid converters under grid faults," in Grid Converters for Photovoltaic and Wind Power Systems, IEEE, pp.237-287, 2007.
  8. D. N. Zmood and D. G. Holmes, "Stationary frame current regulation of PWM inverters with zero steady-state error," in IEEE Transactions on Power Electronics, Vol. 18, No. 3, pp. 814-822, May. 2003. https://doi.org/10.1109/TPEL.2003.810852
  9. Xiaoming Yuan, W. Merk, H. Stemmler and J. Allmeling, "Stationary-frame generalized integrators for current control of active power filters with zero steady-state error for current harmonics of concern under unbalanced and distorted operating conditions," in IEEE Transactions on Industry Applications, Vol. 38, No. 2, pp. 523-532, Mar-Apr. 2002. https://doi.org/10.1109/28.993175
  10. J. C. Vasquez, J. M. Guerrero, M. Savaghebi, J. Eloy-Garcia and R. Teodorescu, "Modeling, analysis, and design of stationary-reference-frame droop-controlled parallel three-phase voltage source inverters," in IEEE Transactions on Industrial Electronics, Vol. 60, No. 4, pp. 1271-1280, Apr. 2013. https://doi.org/10.1109/TIE.2012.2194951
  11. J. Lu, M. Savaghebi and J. M. Guerrero, "Feedforward control strategy for the state-decoupling stand-alone UPS with LC output filter," 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe), pp. P.1-P.8, 2017.
  12. M. Yu et al., "A novel decoupled current-sharing scheme based on circulating-impedance in parallel multi-inverter system," IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, pp. 1668-1672, 2007.
  13. Y. Zhang, M. Yu, F. Liu and Y. Kang, "Instantaneous current-sharing control strategy for parallel operation of UPS modules using virtual impedance," in IEEE Transactions on Power Electronics, Vol. 28, No. 1, pp. 432-440, Jan. 2013. https://doi.org/10.1109/TPEL.2012.2200108
  14. F. de Bosio, L. A. de Souza Ribeiro, F. D. Freijedo, M. Pastorelli and J. M. Guerrero, "Effect of state feedback coupling and system delays on the transient performance of stand-alone VSI with LC output filter," in IEEE Transactions on Industrial Electronics, Vol. 63, No. 8, pp. 4909-4918, Aug. 2016.
  15. R. I. Bojoi, G. Griva, V. Bostan, M. Guerriero, F. Farina and F. Profumo, "Current control strategy for power conditioners using sinusoidal signal integrators in synchronous reference frame," in IEEE Transactions on Power Electronics, Vol. 20, No. 6, pp. 1402-1412, Nov. 2005.
  16. R. Teodorescu, F. Blaabjerg, M. Liserre, P. C. Loh, "Proportional-resonant controllers and filters for grid-connected voltage-source converters," in IEE Proceedings-Electric Power Applications, Vol. 153, No. 5, pp. 750-762, Sep. 2006. https://doi.org/10.1049/ip-epa:20060008
  17. Yeon-Wook Choe. "Optimal tuning strategy for 2-degree-of-freedom i-PID controllers" The transactions of The Korean Institute of Electrical Engineers, Vol. 67, No. 9, pp. 1202-1209, 2018. https://doi.org/10.5370/KIEE.2018.67.9.1202