A Novel Quadrant Search Based Mitigation Technique for DC Voltage Fluctuations in Multilevel Inverters

Johnson Anitha Roseline; Subramanian Vijayenthiran; Rajini V; Senthil Kumaran Mahadevan

A Novel Quadrant Search Based Mitigation Technique for DC Voltage Fluctuations in Multilevel Inverters

Johnson Anitha Roseline

Subramanian Vijayenthiran

Rajini V

Senthil Kumaran Mahadevan

Vol. 15, No. 3, pp. 670-684, May 2015

10.6113/JPE.2015.15.3.670

Fluctuating DC voltages

Hybrid cascaded MLI

Quadrant search

Space vector modulation

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Abstract

The hybrid cascaded multilevel inverter (HCMLI) is a popular converter topology that is being increasingly used in high power medium voltage drives. The intricacy of the control technique for a HCMLI increases with the number of levels and due to fluctuating dc voltages. This paper presents a novel offline quadrant search based space vector modulation technique to synthesize a sinusoidal output from a dispersed pattern of voltage vectors due to different voltages in the auxiliary unit. Such an investigation has never been reported in the literature and it is being attempted for the first time. The method suggested distributes the voltage vectors for a reduced total harmonic distortion at minimal computation. In addition, the proposed algorithm determines the maximum modulation index in the linear modulation range in order to synthesize a sinusoidal output for both normal and abnormal vector patterns. It is better suited for a wide range of practical applications. It is particularly well suited for renewable source fed inverters which utilize large capacitor banks to maintain the dc link, which are prone to such slow fluctuations. The proposed quadrant search space vector modulation technique is simulated using MATLAB/SIMULINK and implemented using a Nexys-2 Spartan-3E FPGA for a developed prototype.

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Cite this article

[IEEE Style]

J. A. Roseline, S. Vijayenthiran, R. V, S. K. Mahadevan, "A Novel Quadrant Search Based Mitigation Technique for DC Voltage Fluctuations in Multilevel Inverters," Journal of Power Electronics, vol. 15, no. 3, pp. 670-684, 2015. DOI: 10.6113/JPE.2015.15.3.670.

[ACM Style]

Johnson Anitha Roseline, Subramanian Vijayenthiran, Rajini V, and Senthil Kumaran Mahadevan. 2015. A Novel Quadrant Search Based Mitigation Technique for DC Voltage Fluctuations in Multilevel Inverters. Journal of Power Electronics, 15, 3, (2015), 670-684. DOI: 10.6113/JPE.2015.15.3.670.