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Neutral point potential control for three-level inverters with low switching frequency
Author(s): 
Pages: 61-66
Year: Issue:  9
Journal: Electric Machines and Control

Keyword:  three-levellow switching frequencyneutral point potentialdemarcation point of subsection modulationoptimal selection of sub-bridges;
Abstract: The switching frequency of the three-level inverters is usually kept low to reduce the dynamic losses of the high-power inverters and which results in an increase in the harmonic components of the out-put current, and affects the control difficulties of the neutral point potential. According to these prob-lems, the influence on the neutral point potential by the output current was analyzed, as well as the first proposing of the demarcation point for the subsection modulation. For low modulation index, the normal pulse width modulation would be more appropriate. A novel approach controlling the neutral point poten-tial for the low modulation index was proposed based on the optimal selection of the sub-bridges. This new method doesn' t need the output current as a feedback signal, which avoids the affect from the severe distortion of the output current at low switching frequency. Experimental results verify that method can maintain the neutral point potential balancing with the switching frequency as low as 500Hz.
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