Capacitor Voltage Balancing with Reduction of Arm Current and THD Control of MMC: A Modified Triangular Injection Approach

Authors

  • M. A. Munjer
  • M. R. I. Sheikh
  • Venkatesh Boddapati
  • M. A. Alim

Abstract

For high power applications, in recent time, Modular Multilevel Converter (MMC) has become popular because it consists of number of DC sources. Stair voltage output waveform of this type of converter can be controlled by different modulation techniques. Harmonic profile of a converter with a modulation scheme much depends on the carrier frequency used in it. On the other hand, with the importance of lower Total Harmonic Distortion (THD), the arm current control is also the necessity to drive an MMC in smooth operation. Moreover, imbalance of the Sub-Module (SM) capacitor voltages affects the arm current as well as the life time of the capacitors. In this way the overall performance of the converter could be affected. As a result, several efforts of research in this area focused on to minimize the THD, balance the capacitor voltage of Sub-module (SM) and to control the arm current of the converter. This paper proposed a modified triangular injection modulation structure for MMC converters to maintain minimum harmonic profile as well as to achieve lower arm current and capacitor voltage balancing of SM within a single algorithm structure. Several well-known modulation methods have been compared with the proposed method so that percentage of THD and the arm current can be identified as minimum and SM’s capacitor voltages could be compared.

References

M. A. Munjer, M. R. I. Sheikh, M. A. Alim, V. Boddapati, and M. A. Musaib, "Minimization of THD for Multilevel Converters with triangular injection approach," 2018 3rd International Conference for Convergence in Technology (I2CT), Pune, 2018, pp. 1-4.

Li, B., Yang, R., Xu, D., Wang, G., & Wang, W. “Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters”, IEEE transaction of Power Electronics, Jan 2014.

N. V. Nguyen, B. X. Nguyen, and H. H. Lee, “An optimized discontinuous PWM method to minimize switching loss for multilevel inverters,” IEEE Trans. Ind. Electron., vol. 58, no. 9, pp. 3958–3966, Sep. 2011.

T. D. Nguyen, J. Hobraiche, N. Patin, G. Friedrich, and J. Vilain, “A direct digital technique implementation of general discontinuous pulse width modulation strategy,” IEEE Trans. Ind. Electron., vol. 58, no. 9, pp. 4445–4454, Sep. 2011.

Ghazal Falahi, Wensong Yu, Alex. Q. Huang, “THD Minimization of Modular Multilevel Converter With Unequal DC Values” IEEE Energy Conversion Congress and Exposition (ECCE) September 2014): pp. 2153-5158.

BARIŞ ÇİFTÇİ , “Selection of suitable PWM switching and control methods for modular multilevel converter drives” M. Sc thesis, Middle East Technical University, December 2014.

S. Allebrod.; R. Hamerski.; R. Marquardt., "New transformerless, scalable Modular Multilevel Converters for HVDC- transmission," Power Electronics Specialists Conference, June 2008.

Saeedifard, Maryam, and Reza Iravani. "Dynamic performance of a modular multilevel back-to-back HVDC system." Power Delivery, IEEE Transactions on 25.4 (2010): 2903-2912.

M. R. Islam, Y. G. Guo, and J. G. Zhu, “A high-frequency link multilevel cascaded medium-voltage converter for direct grid integration of renewable energy systems,” IEEE Trans. Power Electron., vol. 29, no. 8, pp. 4167–4182, Aug. 2014.

M. A. Munjer, M. R. I. Sheikh, M. A. Alim, V. Boddapati and M. A. Musaib, " Minimization of THD for MMC with triangular injection approach" International Conference on Electrical, Electronics, Computers, Communication, Mechanical and Computing (EECCMC-2018), Tamil Nadu, India, 2018.

BARIŞ ÇİFTÇİ , “Selection of suitable PWM switching and control methods for modular multilevel converter drives” M. Sc thesis, Middle East Technical University, pp. 7-8, December 2014.

S. Sedghi, A. Dastfan, and A. Ahmadyfard, "A new multilevel carrier based pulse width modulation method for modular multilevel inverter," Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on, pp.1432-1439, May 30 - June 3 2011.

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Published

2020-10-30

How to Cite

Munjer, M. A., Sheikh, M. R. I., Boddapati, V. B., & Alim, M. A. (2020). Capacitor Voltage Balancing with Reduction of Arm Current and THD Control of MMC: A Modified Triangular Injection Approach. International Journal of Electrical Engineering and Applied Sciences (IJEEAS), 3(2). Retrieved from https://ijeeas.utem.edu.my/ijeeas/article/view/5938

Issue

Vol. 3 No. 2 (2020): Electrical Engineering and Applied Sciences

Section

Articles

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