DOI QR코드

DOI QR Code

VPI-based Control Strategy for a Transformerless MMC-HVDC System Under Unbalanced Grid Conditions

  • Kim, Si-Hwan (Dept. of Electrical Engineering, Hanyang University) ;
  • Kim, June-Sung (Dept. of Electrical Engineering, Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Engineering, Hanyang University) ;
  • Cho, Jin-Tae (Korea Electric Power Research Institute(KEPRI), Korea Electric Power, Corporation(KEPCO)) ;
  • Kim, Seok-Woong (Korea Electric Power Research Institute(KEPRI), Korea Electric Power, Corporation(KEPCO))
  • Received : 2017.10.11
  • Accepted : 2018.07.06
  • Published : 2018.11.01

Abstract

This paper introduces a control method for a transformerless MMC-HVDC system. The proposed method can effectively control the grid currents of the MMC-HVDC system under unbalanced grid conditions such as a single line-to-ground fault. The proposed method controls the currents of the positive sequence component and the negative sequence component without separating algorithms. Therefore, complicated calculations for extracting the positive sequence and the negative sequence component are not required. In addition, a control method to regulate a zero sequence component current under unbalanced grid conditions in the transformerless MMC-HVDC system is also proposed. The validity of the proposed method is verified through PSCAD/EMTDC simulation.

Acknowledgement

Grant : Demonstration Study for Low Voltage Direct Current Distribution Network in an Island

Supported by : Korea Electric Power Research Institute

References

  1. Marcelo A. Perez, Steffen Bernet, Jose Rodriguez, Samir Kouro, and Ricardo Lizana, "Circuit Topologies, Modeling, Control Schemes, and Applications of Modular Multilevel Converters," IEEE Trans. Power Electronics, vol. 30, pp. 4-17, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2310127
  2. Alireza Nami, Jiaqi Liang, Frans Dijkhuizen, and Georgios D. Demetriades, "Modular Multilevel Converters for HVDC Applications: Review on Converter Cells and Functionalities," IEEE Trans. Power Electronics, vol. 30, pp. 18-36, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2327641
  3. Suman Debnath, Jiangchao Qin, Behrooz Bahrani, Maryam Saeedifard, and Peter Barbosa, "Operation, Control, and Applications of the Modular Multilevel Converter: A Review," IEEE Trans. Power Electronics, vol. 30, pp. 37-53, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2309937
  4. Maryam Saeedifard and Reza Iravani, "Dynamic Performance of a Modular Multilevel Back-to-Back HVDC System," IEEE Trans. Power Delivery, vol. 25, pp. 2903-2912, Oct. 2010. https://doi.org/10.1109/TPWRD.2010.2050787
  5. Minyuan Guan and Zheng Xu, "Modeling and Control of a Modular Multilevel Converter-Based HVDC System Under Unbalanced Grid Conditions," IEEE Trans. Power Electronics, vol. 27, pp. 4858-4867, Dec. 2012. https://doi.org/10.1109/TPEL.2012.2192752
  6. Qingrui Tu, Zheng Xu, Yong Chang, and Li Guan, "Suppressing DC Voltage Ripples of MMC-HVDC Under Unbalanced Grid Conditions," IEEE Trans. Power Delivery, vol. 27, pp. 1332-1338, July 2012. https://doi.org/10.1109/TPWRD.2012.2196804
  7. Zhou Yuebin, Jiang Daozhuo, Guo Jie, Hu Pengfei, and Lin Zhiyong, "Control of Modular Multilevel Converter Based on Stationary Frame under Unbalanced AC System," in Proceedings of ICDMA Conference, GuiLin, China, July 2012.
  8. Hu Pengfei, Jiang Daozhuo, Zhou Yuebin, Guo Jie, and Lin Zhiyong, "Study of the Proportional Resonant Control Based Modular Multilevel Converter," in Proceedings of ICDMA Conference, GuiLin, China, July 2012.
  9. Zhou Yuebin, Jiang Daozhuo, Jie Guo, Pengfei Hu, and Yiqiao Liang, "Analysis and Control of Modular Multilevel Converters Under Unbalanced Conditions," IEEE Trans. Power Delivery, vol. 28, pp. 1986-1995, Oct. 2013. https://doi.org/10.1109/TPWRD.2013.2268981
  10. Ngoc-Thinh Quach, Ji-Han Ko, Dong-Wan Kim, and Eel-Hwan Kim, "An Application of Proportional-Resonant Controller in MMC-HVDC System under Unbalanced Voltage Conditions," Journal of Electrical Engineering & Technology, vol. 9, pp. 1746-1752, Sep. 2014. https://doi.org/10.5370/JEET.2014.9.5.1746
  11. Shaohua Li, Xiuli Wang, Zhiqing Yao, Tai Li, and Zhong Peng, "Circulating Current Suppressing Strategy for MMC-HVDC Based on Nonideal Proportional Resonant Controllers Under Unbalanced Grid Conditions," IEEE Trans. Power Electronics, vol. 30, pp. 387-397, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2329059
  12. Ji-Woo Moon, Jin-Su Gwon, Jung-Woo Park, Dae-Wook Kang, and Jang-Mok Kim, "Model Predictive Control With a Reduced Number of Considered States in a Modular Multilevel Converter for HVDC System," IEEE Trans. Power Delivery, vol. 30, pp. 608-617, Apr. 2015. https://doi.org/10.1109/TPWRD.2014.2303172
  13. Xiaojie Shi, Zhiqiang Wang, Bo Liu, Remus Yalong Li, Leon M. Tolbert, and Fred Wang, "Steady-State Modeling of Modular Multilevel Converter under Unbalanced Grid Conditions," IEEE Trans. Power Electronics, vol. 32, pp. 7306-7324, Sep. 2017. https://doi.org/10.1109/TPEL.2016.2629472
  14. Anton Stepanov, Hani Saad, Jean Mahseredjian, and Aurelien Watare, "Overview of Generic HVDCMMC Control under Unbalanced Grid Conditions," in Proceedings of IPST 2017 Conference, Seoul, Korea, Jun. 2017.
  15. Artjoms Timofejevs, Daniel Gamboa, Marco Liserre, Remus Teodorescu, and Sanjay K. Chaudhary, "Control of transformerless MMC-HVDC during asymmetric grid faults," in Proceedings of IECON 2013 Conference, Vienna, Austria, Nov. 2013.
  16. Xiaojie Shi, Zhiqiang Wang, Bo Liu, Yiqi Liu, Leon M. Tolbert, and Fred Wang, "Characteristic Investigation and Control of a Modular Multilevel Converter-Based HVDC System Under Single-Lineto-Ground Fault Conditions," IEEE Trans. Power Electronics, vol. 30, pp. 408-421, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2323360
  17. Ghazal Falahi and Alex Huang, "Control of modular multilevel converter based HVDC systems during asymmetrical grid faults," in Proceedings of IECON 2014 Conference, Dallas, TX, USA, Nov., 2014.
  18. Cristian Lascu, Lucian Asiminoaei, Ion Boldea, and Frede Blaabjerg, "High performance current controller for selective harmonic compensation in active power filters," IEEE Trans. Power Electronics, vol. 22, pp. 1826-1835, Sep. 2007. https://doi.org/10.1109/TPEL.2007.904060
  19. Cristian Lascu, Lucian Asiminoaei, Ion Boldea, and Frede Blaabjerg, "Frequency Response Analysis of Current Controllers for Selective Harmonic Compensation in Active Power Filters," IEEE Trans. Industrial Electronics, vol. 56, pp. 337-347, Feb. 2009.
  20. Quoc-Nam Trinh and Hong-Hee Lee, "An Advanced Current Control Strategy for Three-Phase Shunt Active Power Filters," IEEE Trans. Industrial Electronics, vol. 60, pp. 5400-5410, Dec. 2013. https://doi.org/10.1109/TIE.2012.2229677
  21. Amirnaser Yazdani, Reza Iravani, "Dynamic model and control of the NPC-based Back-to-Back HVDC system," IEEE Trans. Power Delivery, vol. 21, pp. 414-424, Jan. 2006. https://doi.org/10.1109/TPWRD.2005.852344