Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter
Pou, J.
Pindado, R.
Boroyevich, D.
Rodriguez, P.
Power Quality & Renewable Energy, Tech. Univ. of Catalonia, Spain;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec. 2005
Volume: 52,
Issue: 6
On page(s): 1582- 1588
ISSN: 0278-0046
INSPEC Accession Number: 8673513
Digital Object Identifier: 10.1109/TIE.2005.858723
Current Version Published: 2005-12-05
Abstract
The nearest vectors to the reference vector are commonly used in space-vector modulation (SVM) strategies. The main advantages of these modulation strategies are the low switching frequencies of the devices, the good output voltage spectra, and the low electromagnetic interference. However, when these techniques are applied to the three-level neutral-point (NP)-clamped inverter, low-frequency oscillations appear in the NP voltage for some operating conditions. As a result, the value of the dc-link capacitors must be increased in order to attenuate such oscillations. In this paper, these amplitudes are quantified for two modulation strategies that use nearest vectors to the reference vector. Owing to the nondimensional variables used in the analysis, the information provided will help for the calculation of the dc-link capacitors in a given specific application. Simulated and experimental examples are presented.
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