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http://dx.doi.org/10.6113/JPE.2015.15.3.670

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

Roseline, Johnson Anitha (Department of Electrical and Electronics Engineering, SSN College of Engineering)
Vijayenthiran, Subramanian (Department of Electrical and Electronics Engineering, SSN College of Engineering)
V., Rajini (Department of Electrical and Electronics Engineering, SSN College of Engineering)
Mahadevan, Senthil Kumaran (Department of Electrical and Electronics Engineering, SSN College of Engineering)
Publication Information
Journal of Power Electronics / v.15, no.3, 2015 , pp. 670-684 More about this Journal
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.
Keywords
Fluctuating DC voltages; Hybrid cascaded MLI; Quadrant search; Space vector modulation;
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