1. A New Modulation Method for a 13-Level Asymmetric Inverter Toward Minimum THD.
- Author
-
Espinosa, Eduardo E., Espinoza, Jose R., Melin, Pedro E., Ramirez, Roberto O., Villarroel, Felipe, Munoz, Javier A., and Moran, Luis
- Subjects
ELECTRIC inverters ,HARMONIC distortion (Physics) ,DIRECT currents ,CONVERTERS (Electronics) ,LOAD flow analysis (Electric power systems) ,DC-AC converters ,SENSITIVITY analysis ,ELECTRONIC modulation - 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]
- Published
- 2014
- Full Text
- View/download PDF