A look-up table based method for voltage balancing of neutral-point in five-level ANPC converter

Document Type : Article

Authors

1 Electrical Machines Research Department, Niroo Research Institute, Tehran, Iran

2 Iranian Research Institute of Electrical Engineering (IRIEE), ACECR, Tehran, Iran

Abstract

In this paper, an easily implementable method based on look-up tables is presented for balancing the neutral-point (NP) voltage in a five-level "Active NPC" topology for space vector modulation (SVM). In the proposed method, by utilizing the direction of output phase currents, operating region is divided into six zones. In each zone, there are two look-up tables; one for increasing the NP voltage and the other for decreasing the NP voltage. Since some look-up tables in different zones are identical, six individual look-up tables are obtained for controlling the NP voltage. In the proposed method, just few comparative operators and six look-up tables are utilized; therefore this method has proper implementation capability. Also, the proposed method is experimentally implemented on an active NPC converter which drives an induction motor via rotor field oriented control (RFOC) method. Experimental results verify performance, good dynamic response and effectiveness in balancing the NP voltage in low and high modulation index.

Keywords

Main Subjects

References

References:
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Scientia Iranica
Volume 31, Issue 21
Transactions on Computer Science & Engineering and Electrical Engineering (D)
November and December 2024
Pages 1981-1993

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History

  • Receive Date: 16 September 2021
  • Revise Date: 28 September 2022
  • Accept Date: 11 April 2023

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