DOI QR코드

DOI QR Code

전압 불평형 조건에서 스위칭 소자의 전류용량을 고려한 MMC-HVDC 순환전류 제어기법

Circulating Current Control in MMC-HVDC Considering Switching Device Current Capacity under Unbalanced Voltage Conditions

  • 투고 : 2015.11.04
  • 심사 : 2015.12.08
  • 발행 : 2016.01.31

초록

This paper proposed a new control method which is capable of controlling circulating current considering current capacity of switching device. In the unbalanced voltage conditions, active power and reactive power have double line frequency. Thus, in order to provide active power without ripple, it is necessary to inject the negative sequence current components. However, when the negative current components is injected, it increases the total current flowing in the Arm, and in the Sub-module(SM) the current more than rated is impressed, which leads to destroy the system. Also, in impressing the circulating current reference of each arm, conventional control method impressed applicable $i_{dck}/3$ in the case of balanced voltage conditions. In the case of unbalanced conditions, as arm circulating current of three phase show difference due to the power impressed to each arm, reference of each arm is not identical. In this study, in the case of unbalanced voltage, within permitted current, the control method to decrease the ripple of active power is proposed, through circulating current control and current limitations. This control method has the advantage that calculates the maximum active power possible to generate capacity and impressed the current reference for that much. Also, in impressing circulating current reference, a new control method proposes to impress the reference from calculating active power of each phase. The proposed control method is verified through the simulation results, using the PSCAD/EMTDC.

키워드

참고문헌

  1. M. P. Bahrman and B. K. Johnson, "The ABCs of HVDC transmission technologies," IEEE Power Energy Mag., vol. 5, no. 2, pp. 32-44, Mar./Apr. 2007. https://doi.org/10.1109/MPAE.2007.329194
  2. Flourentzou, N. Agelidis, V.G. Demetriades, G.D., "VSC-Based HVDC Power Transmission Systems: An Overview," IEEE Trans., Power Electronics, vol.24, no.3, pp.592-602, Mar.2009. https://doi.org/10.1109/TPEL.2008.2008441
  3. S. Cole and R. Belmans, "Transmission of bulk power: The history and applicationsof voltage-source converter high-voltage direct current systems," IEEE Ind. Electron.Mag., vol. 3, no.3, pp. 19-24, Sept. 2009. https://doi.org/10.1109/MIE.2009.933884
  4. M. Callavik, "ABB-HVDC grids for integration of renewable power sources," in Proc. EPRI HVDC & FACTS Users Meeting, 2010.
  5. R. Marquardt, "Current Rectification Circuit for Voltage Source Inverters with Separate Energy Stores Replaces Phase Blocks with Energy Storing Capacitors," German Patent (DE10103031A1), 25 July 2002.
  6. A. Lesnicar, R. Marquardt, "An Innovative Modular Multilevel Converter Topology Suitable for a Wide Power Range," IEEE Power Tech Conference Proceedings, vol.3, pp. 6, Bologna 2003.
  7. Q. Tu, Z. Xu, H. Huang, and J. Zhang, "Parameter design principle of the arm inductor in modular multilevel converter based HVDC," in Proc. Int. Conf. Power Syst. Tech., Hangzhou, China, 2010, pp. 1-6. Oct. 2010.
  8. Chaudhary.S.K., Teodorescu. R., Rodriguez. P.,Kjaer. P.C.,Gole. A.M., "Negative Sequence Current Control in Wind Power Plants With VSC-HVDC Connection", IEEE Trans. Sustainable Energy, Vol. 3, No. 3, pp. 535-544, July. 2012. https://doi.org/10.1109/TSTE.2012.2191581
  9. Ji-Woo Moon, Chun-Sung Kim, Jung-Woo Park, Dea-Wook Kang, and Jang-Mok Kim, "Circulating Current Control in MMC Under the Unbalanced Voltage", IEEE Trans. Power Del, Vol.28, No.3, pp. 1952-1959, Jul. 2013. https://doi.org/10.1109/TPWRD.2013.2264496
  10. QingruiTu, ZhengXu, Yong Chang, and Li Guan, "Suppressing DC Voltage Ripples of MMC-HVDC Under Unbalanced Grid Conditions", IEEE Trans. Power Del, Vol. 27, No. 3, pp. 1332 - 1338, July. 2012. https://doi.org/10.1109/TPWRD.2012.2196804
  11. Hong-Seok Sing, and Kwang-hee Nam, "Dual Current Control Scheme for PWM Converter Under Unbalanced Input Voltage Conditions", IEEE Trans. Industrial electronics, Vol. 46, No. 5, pp. 953-959, Oct. 1999. https://doi.org/10.1109/41.793344
  12. M. Saeedifard and R. Iravani, "Dynamic performance of a modular multilevel back-to-back HVDC system", IEEE Trans. Power Del, Vol.25, No. 4, pp. 2903-2912, Oct. 2010. https://doi.org/10.1109/TPWRD.2010.2050787
  13. Yazdani. A, Iravani. R, "A unified dynamic model and control for the voltage-sourced converter under unbalanced grid conditions", IEEE Trans. Power Del, Vol.21, No. 3, pp. 1620-1629, Jul. 2006. https://doi.org/10.1109/TPWRD.2006.874641
  14. Q. Tu, Z. Xu, and L. Xu, "Reduced switching-frequency modulation and circulating current suppression for modular multilevel converters," IEEE Trans. Power Del., Vol. 26, No. 3, pp. 2009-2017, Jul. 2011. https://doi.org/10.1109/TPWRD.2011.2115258
  15. Gnanarathna. U.N., Gole. A.M., Jayasinghe. R.P., "Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs", IEEE Trans. Power Del,. Vol. 26, No. 1, pp. 316-324, Jan. 2011. https://doi.org/10.1109/TPWRD.2010.2060737
  16. Jianzhong Xu, Chengyong Zhao, Wenjing Liu, Chunyi Guo, "Accelerated Model of Modular Multilevel Converters in PSCAD/EMTDC", IEEE Trans. Power Del., Vol. 28, No. 1, pp. 129-136, Jan. 2013. https://doi.org/10.1109/TPWRD.2012.2201511
  17. Minyuan Guan, Zheng Xu, "Modeling and Control of a Modular Multilevel Converter-Based HVDC System Under Unbalanced Grid Conditions", IEEE Trans. Power Electronics., Vol. 27, No. 12, pp. 4858-4867, Dec. 2012. https://doi.org/10.1109/TPEL.2012.2192752