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

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Alleviate Current Distortion of Dual-buck Inverter During Reactive Power Support

듀얼벅 인버터의 무효전력 보상 시 전류 왜곡 저감

  • Han, Sanghun (Dept. of Electronic Electronics Engineering, Konkuk University) ;
  • Cho, Younghoon (Dept. of Electrical and Electronics Engineering, Konkuk University)
  • Received : 2021.10.06
  • Accepted : 2021.11.05
  • Published : 2022.04.20
Download PDF
⟨ Previous Next ⟩

Abstract

This study presents a method for reducing current distortion that occurs when a dual-buck inverter generates reactive power. Dual-buck inverters, which are only capable of unity power factor operation, can generate reactive power capabilities by modifying a modulation technique. However, under non-unity power factor conditions, current distortion occurs at zero-crossing points of grid voltage and output current. This distortion is caused by parasitic capacitors, dead-time, and discontinuous conduction mode operation. This study proposes a modified modulation method to alleviate the current distortion at zero-crossing point of the grid voltage. A repetitive controller is applied to reduce this distortion of the output current. A 1 kVA prototype is built and tested. Simulation and experimental results demonstrate the effectiveness of the proposed method.

Keywords

Acknowledgement

본 연구는 2021년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 에너지인력양성사업으로 지원받아 수행한 인력양성 성과입니다. (No. 20194030202370) 본 연구는 산업통상자원부와 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다. (No. 20206910100160)

References

  1. T. K. S. Freddy, J. Lee, H. Moon, K. Lee, and N. A. Rahim, "Modulation technique for single-phase transformerless photovoltaic inverters with reactive power capability," IEEE Transactions on Industrial Electronics, Vol. 64, No. 9, pp. 6989-6999, Sep. 2017. https://doi.org/10.1109/TIE.2017.2686366
  2. H. Qian, J. Zhang, J. Lai, and W. Yu, "A high-efficiency grid-tie battery energy storage system," IEEE Transactions on Power Electronics, Vol. 26, No. 3, pp. 886-896, Mar. 2011. https://doi.org/10.1109/TPEL.2010.2096562
  3. H. Qian, J. Lai, and W. Yu, "Novel bidirectional AC-DC MOSFET converter for energy storage system applications," IEEE Energy Conversion Congress and Exposition, pp. 3466-3471, Sep. 2011.
  4. B. Chen, B. Gu, L. Zhang, and J. Lai, "A novel pulse-width modulation method for reactive power generation on a CoolMOS- and SiC-diode-based transformerless inverter," IEEE Transactions on Industrial Electronics, Vol. 63, No. 3, pp. 1539-1548, Mar. 2016. https://doi.org/10.1109/TIE.2015.2498118
  5. B. Liu, M. Su, J. Yang, D. Song, D. He, and S. Song, "Combined reactive power injection modulation and grid current distortion improvement approach for H6 transformer-less photovoltaic inverter," IEEE Transactions on Energy Conversion, Vol. 32, No. 4, pp. 1456-1467, Dec. 2017. https://doi.org/10.1109/TEC.2017.2712741
  6. A. K. Gupta, M. S. Joshi, and V. Agarwal, "Improved transformerless grid-tied PV inverter effectively operating at twice the switching frequency with constant CMV and reactive power capability," IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 8, No. 4, pp. 3477-3486, Dec. 2020. https://doi.org/10.1109/jestpe.2019.2943773
  7. K. S. Kumar, A. Kirubakaran, and N. Subrahmanyam, "Bidirectional CLAMPING-BASED H5, HERIC, and H6 transformerless inverter topologies with reactive power capability," IEEE Transactions on Industry Applications, Vol. 56, No. 5, pp. 5119-5128, Sep.-Oct. 2020. https://doi.org/10.1109/tia.2020.2999552
  8. Y. Cho, "Dual-buck residential photovoltaic inverter with a high-accuracy repetitive current controller," Renewable Energy, Vol. 101, pp. 168-181, Feb. 2017. https://doi.org/10.1016/j.renene.2016.08.050
  9. D. H. Hwang, J. Y. Lee, and Y. Cho, "Single-phase single-stage dual-buck photovoltaic inverter with active power decoupling strategy," Renewable Energy, Vol. 126, pp. 454-464, Oct. 2018. https://doi.org/10.1016/j.renene.2018.03.069
  10. J. Y. Lee and Y. Cho, "Synchronous reference frame re petitive control of a single-phase three-level dual-buck photovoltaic inverter," Electronics, Vol. 7, No. 10, p. 226, 2018. https://doi.org/10.3390/electronics7100226
  11. M. N. I. Sarkar, L. G. Meegahapola, and M. Datta, "Reactive power management in renewable rich power grids: a review of grid-codes, renewable generators, support devices, control strategies and optimization algorithms," IEEE Access, Vol. 6, pp. 41458-41489, May. 2018. https://doi.org/10.1109/access.2018.2838563
  12. H. M. Hasanien, "An adaptive control strategy for low voltage ride through capability enhancement of grid-connected photovoltaic power plants," IEEE Transactions on Power Systems, Vol. 31, No. 4, pp. 3230-3237, Jul. 2016. https://doi.org/10.1109/TPWRS.2015.2466618
  13. G. Fusco and M. Russo, "Robust MIMO design of decentralized voltage controllers of PV systems in distribution networks," IEEE Transactions on Industrial Electronics, Vol. 64, No. 6, pp. 4610-4620, Jun. 2017. https://doi.org/10.1109/TIE.2017.2652386
  14. M. Rajeev and V. Agarwal, "Low voltage ride-through capability of a novel grid connected inverter suitable for transformer-less solar PV-grid interface," IEEE Transactions on Industry Applications, Vol. 56, No. 3, pp. 2799-2806, May/Jun. 2020. https://doi.org/10.1109/tia.2020.2979134
  15. I. R. S. Priyamvada and S. Das, "Online assessment of transient stability of grid connected PV generator with DC link voltage and reactive power control," IEEE Access, Vol. 8, pp. 220606-220619, 2020. https://doi.org/10.1109/ACCESS.2020.3042784
  16. J. Joshi, A. K. Swami, V. Jately, and B. Azzopardi, "A comprehensive review of control strategies to overcome challenges during LVRT in PV systems," IEEE Access, Vol. 9, pp. 121804-121834, 2021. https://doi.org/10.1109/ACCESS.2021.3109050
  17. B. Chen, B. Gu, J. Lai, W. Yu, C. Lin, and C. Zheng, "Current distortion correction in dual buck photovoltaic inverter with a novel PWM modulation and control method," in 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 727-731, Mar. 2013.
  18. P. Sun, C. Liu, J. Lai, and C. Chen, "Cascade dual buck inverter with phase-shift control," IEEE Transactions on Power Electronics, Vol. 27, No. 4, pp. 2067-2077, Apr. 2012. https://doi.org/10.1109/TPEL.2011.2169282