Fuzzy logic controller based DC-Link Voltage Self-Balance Method for Multilevel Converter with less Number of Voltage Sensors

M. Siva Reddy, V. Haribabu, M. Bala Subba Reddy


In many inverters, Voltage balance of dc-link capacitors is very important for applications of a cascade multilevel converter or a modular multilevel converter. In this paper, a novel diode-clamped modular multilevel converter (DCM2 C) topology is proposed and a power feedback control method is developed with fuzzy logic controller. With the developed control strategy, the proposed diode-clamped circuit becomes controllable closed loop which enables the capacitor voltages to be clamped by low power rating clamping diodes. The proposed topology and control strategy has quicker response with transient state error reduction and requires much fewer voltage sensors than the normally used traditional method of multilevel inverters as diode clamped inverters; therefore, the system performance improvement and cost reduction are expected. Based on the proposed DCM2 C, a novel N +1-level cascade multilevel topology is proposed for a cascade active power filter (CS-APF). The Proposed fuzzy logic controller is implemented to get study state response at dc voltage capacitors, therefore to get balanced load outputs. The simulation results from the CS-APF have demonstrated and verified the effectiveness of the proposed novel topology and control method.


H. Akagi, “New trends in active filters for power conditioning,” IEEE Trans. Ind. Appl., vol. 32, no. 6, pp. 1312–1322, Nov.–Dec. 1996.

B. Singh, K. Al-Haddad, and A. Chandra, “A review of active power filters for power quality improvements,” IEEE Trans. Ind. Electron., vol. 46,

no. 5, pp. 960–971, Oct. 1999.

H. Akagi, “Active harmonic filters,” in Proc. IEEE, Dec.2005, vol. 93, no. 12, pp. 2128–2141.

J. Ju, D. Xu, M. Chen, J. Xu, B. Shen, and F. Zhang, “Control strategy of multi-modular active power filter system,” in Proc. IEEE Appl. Power

Electron. Conf, Mar.2007, pp. 686–691.

T. Lee and P. Cheng, “Design of a new cooperative harmonic filtering strategy for the distributed generation systems,” in Proc. IEEE 40th Ind.Appl. Soc. Annu. Meet. Ind. Appl. Conf., Oct.2005, pp. 549–556.

P. Cheng and Z. Lee, “Distributed active filter systems (DAFS): A new approach to power system harmonics,” in presented at the IEEE 39th Ind. Appl. Soc. Annu. Meet. Ind. Appl. Conf., Seattle, WA, Oct.2004.

M. Rastogi, P. W. Hammond, and S. R. Simms, “Multi-level active filter for medium voltage applications,” in Proc. Power Electron. Drives Syst.,

Nov. 2005, pp. 1508–1513.

A. Nami, F. Zare, A. Ghosh, and F. Blaabjerg, “A hybrid cascade converter topology with series-connected symmetrical and asymmetrical diodeclamped H-bridge cells,” IEEE Trans. Power Electron., vol. 26, no. 1, pp. 51–65, Jan. 2011.

D. Peftitsis, G. Tolstoy, A. Antonopoulos, J. Rabkowski, J.-K. Lim, M. Bakowski, L. Angquist, and N. Lee, “High-power modular multilevel

converters with SiC JFETs,” IEEE Trans. Power Electron., vol. 27, no. 1, pp. 28–36, Jan. 2012.

H. P. Mohammadi and M. T. Bina, “A transformerless medium-voltage STATCOM topology based on extended modular multilevel converters,” IEEE Trans. Power Electron., vol. 26, no. 5, pp. 1534–1545, May 2011.

F. Z. Peng and J. Wang, “A universal STATCOM with delta-connected cascade multilevel inverter,” in Proc. 35th Annu. IEEE Power Electron.

Spec. Conf., Jun. 2004, pp. 3529–3533.

R. E. Betz and T. J. Summers, “Using a cascaded H-bridge STATCOM for rebalancing unbalanced voltages,” in Proc. 7th Int. Conf. Power Electron., Oct. 2007, pp. 1219–1224.

H. Akagi, S. Inoue, and T. Yoshii, “Control and performance of a transformerless cascade PWM STATCOM with star configuration,” IEEE Trans. Ind. Electron., vol. 43, no. 4, pp. 1041–1049, Jul.–Aug. 2007.

Q. Song and W. Liu, “Control of a cascade STATCOM with star configuration under unbalanced conditions,” IEEE Trans. Power Electron. vol. 24, no. 1, pp. 45–58, Jan. 2009.

S. Allebrod, R. Hamerski, and R. Marquardt, “New transformerless, scalable modular multilevel converters for HVDC-transmission,” in Proc. IEEE Power Electron. Spec. Conf., Jun. 2008, pp. 174–179.

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