2003
DOI: 10.1109/tpel.2003.818830
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Elimination of subharmonics in direct look-up table (DLT) sine wave reference generators for low-cost microprocessor-controlled inverters

Abstract: Abstract-This paper investigates distortion of an inverter reference waveform generated using a direct look-up (DLT) algorithm. The sources of various distortion components are identified and the implications for application to variable speed drives and grid connected inverters are described. Harmonic and subharmonic distortion mechanisms are analyzed, and compared with experimental results. Analytical methods are derived to determine the occurrence of subharmonics, their number, frequencies and maximum amplit… Show more

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Cited by 24 publications
(9 citation statements)
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“…The feedforward control implementation improved the inverter output current waveform only slightly. These current harmonics are likely due to unwanted delays in the system [24] or phase shift in the grid filter causing issues with the unfolding circuit. Further investigation of means to improve this THD is required and this could include modifying the sinewave function look-up table.…”
Section: Discussionmentioning
confidence: 99%
“…The feedforward control implementation improved the inverter output current waveform only slightly. These current harmonics are likely due to unwanted delays in the system [24] or phase shift in the grid filter causing issues with the unfolding circuit. Further investigation of means to improve this THD is required and this could include modifying the sinewave function look-up table.…”
Section: Discussionmentioning
confidence: 99%
“…where means clock frequency. For producing low distortion sine wave, step size ∆ should be chosen ∆= 1 [31][32][33][34][35][36]. The generated sampled waveform is only an approximation to sine wave.…”
Section: A New Pllmentioning
confidence: 99%
“…O método conhecido como Look-Up Table é uma das maneiras mais simples para gerar formas de ondas arbitrárias [8][9][10]. Nesse método, as amostras da forma de onda a ser gerada são pré-calculadas ao longo de um ciclo e armazenadas na memória digital.…”
Section: Direct Look-up Table (Dlt)unclassified