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A New Modulation Method for a 13-Level Asymmetric Inverter Toward Minimum THD.
- Source :
-
IEEE Transactions on Industry Applications . May2014, Vol. 50 Issue 3, p1924-1933. 10p. - Publication Year :
- 2014
-
Abstract
- An asymmetric inverter features different dc-link voltages for each power cell and depending on the dc voltage ratios, there are binary, trinary, etc., asymmetric topologies. In particular, the trinary one can provide a waveform with 3^n levels, where n is the number of cells connected in cascade. Hence, for $n = 3$, an output voltage with 27 levels can be obtained, ensuring a low total harmonic distortion (THD) and reduced $dv/dt$. However, when the load consumes active power, some power cells of the inverter can operate in regeneration mode, complicating the topology and control. To overcome this problem, a new modulation method for asymmetric inverters is presented. It features an ac output voltage of 13 levels for $n = 3$, and ensures unidirectional power flow in every power cell. This new modulation method also provides a voltage waveform with low $dv/dt$ and reduced THD (5.7%). To confirm the approach, power flow and sensitivity analysis to changes in the dc voltage ratios are performed. Finally, simulation and experimental results are provided. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 50
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- 96119546
- Full Text :
- https://doi.org/10.1109/TIA.2013.2282494