RT Journal Article
T1 Fast-processing modulation strategy for the neutral-point-champed converter with total elimination of low-frequency voltage oscillations in the neutral point
A1 Pou, Josep
A1 Zaragoza, Jordi
A1 Rodríguez, Pedro
A1 Ceballos, Salvador
A1 Sala, Vicenç M.
A1 Burgos, Rolando P.
A1 Boroyevich, Dushan
AB This paper presents a novel modulation strategy for a neutral-point-clamped converter. This strategy overcomes one of the main problems of this converter, which is the low-frequency voltage oscillation that appears in the neutral point under some operating conditions. The proposed modulation strategy can completely remove this oscillation for all the operating points and for any kind of loads, even unbalanced and nonlinear loads. The algorithm is based on a carrier-based pulsewidth modulation. Nevertheless, it can generate the maximum output-voltage amplitudes that are attainable under linear modulation, such as space-vector modulation. Furthermore, this technique can be implemented with a very simple algorithm and, hence, can be processed very quickly. The only drawback of this strategy is that the switching frequencies of the devices are one third higher than those of standard sinusoidal pulsewidth modulation. A control loop for balancing the voltages on the dc-link capacitors is also proposed. This balancing strategy is designed, so that it does not further increase the switching frequencies of the devices when it is applied to the converter. The proposed modulation technique is verified by simulation and experiment.
SN 0278-0046
YR 2007
FD 2007-08
LA eng
NO Pou , J , Zaragoza , J , Rodríguez , P , Ceballos , S , Sala , V M , Burgos , R P & Boroyevich , D 2007 , ' Fast-processing modulation strategy for the neutral-point-champed converter with total elimination of low-frequency voltage oscillations in the neutral point ' , IEEE Transactions on Industrial Electronics , vol. 54 , no. 4 , pp. 2288-2294 . https://doi.org/10.1109/TIE.2007.894788
NO Manuscript received May 9, 2006; revised July 25, 2006. This work was supported in part by the Departament d’Universitats, Recerca i Societat de la Informació of the Generalitat de Catalunya under Grant 2005BE00481, Grant 2004BE00105, and Grant 2004BE00060, and in part by the Ministerio de Ciencia y Tecnologia of Spain under Project ENE2004-07881-C03-02 and Project ENE2004-07881-C03-03. This work made use of the Engineering Research Center Shared Facilities, which are supported in part by the National Science Foundation under NSF Award EEC-9731677 and in part by the CPES Industry Partnership Program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the National Science Foundation. This paper was presented at the 31st Annual Conference of the IEEE Industrial Electronics Society, Raleigh, NC, November 6–10, 2005.
DS TECNALIA Publications
RD 28 jul 2024