DocumentCode :
1173626
Title :
Real-Time Algorithm for Minimizing THD in Multilevel Inverters With Unequal or Varying Voltage Steps Under Staircase Modulation
Author :
Liu, Yu ; Hong, Hoon ; Huang, Alex Q.
Author_Institution :
Dept. of Electr. Eng., North Carolina State Univ., Raleigh, NC
Volume :
56
Issue :
6
fYear :
2009
fDate :
6/1/2009 12:00:00 AM
Firstpage :
2249
Lastpage :
2258
Abstract :
Different modulation methods have been proposed to control the multilevel inverters. This paper focuses on the staircase modulation that is very popular for multilevel inverters with low switching frequencies. Nonreal-time algorithms for the staircase modulation cannot be applied practically in multilevel inverters with varying voltage steps, since the sizes of lookup tables would be huge. We propose a real-time algorithm for multilevel inverters with unequal or varying voltage steps under the staircase modulation. The algorithm results in the minimal total harmonic distortion (THD) of the output voltage of the inverter, which is proved by rigorous mathematical derivations in this paper. A new expression of THD is presented to simplify the derivation significantly. Computational complexity of the algorithm is analyzed to estimate the time cost of the calculation. We implemented the algorithm on a digital signal processor and provide experimental results that verify the performance of the proposed algorithm.
Keywords :
harmonic distortion; invertors; modulation; power conversion harmonics; switching convertors; THD elimination; computational complexity; low-switching frequency; multilevel inverter; real-time algorithm; staircase modulation; total harmonic distortion; Multilevel inverter; multilevel pulsewidth modulation (PWM); power conversion; staircase modulation;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2009.2015360
Filename :
4787074
Link To Document :
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