Optimal switching in a three-level inverter: An analytical approach

Almog Salman, Yair Cohen, Lior Simchon, Tirza Routtenberg, Raul Rabinovici

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper addresses the problem of optimal pulse width modulation (PWM) voltage switching signals that minimizes the total harmonic distortion (THD) for a three-level inverter. Previous works have focused on the derivation of ad-hoc methods that achieve low voltage THD values by using frequency domain analysis and brute-force search. The use of optimization techniques in power systems, especially in THD minimization, can improve system performance and reduce computational complexity, thus providing a manageable method with claims to optimality. In this paper, an optimization method, the Lagrange multipliers technique, is used to solve the THD minimization problem. For a given modulation index it is shown that the minimization of the voltage THD results in a single-switch solution. Finally, the performance of the proposed optimal singleswitch solution is examined in simulations. The proposed method reduces computational complexity, compared to the brute-force methods, and increases solution accuracy by using analytical THD time domain expressions.

Original languageEnglish
Title of host publication2016 IEEE International Conference on the Science of Electrical Engineering, ICSEE 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509021529
DOIs
StatePublished - 4 Jan 2017
Event2016 IEEE International Conference on the Science of Electrical Engineering, ICSEE 2016 - Eilat, Israel
Duration: 16 Nov 201618 Nov 2016

Publication series

Name2016 IEEE International Conference on the Science of Electrical Engineering, ICSEE 2016

Conference

Conference2016 IEEE International Conference on the Science of Electrical Engineering, ICSEE 2016
Country/TerritoryIsrael
CityEilat
Period16/11/1618/11/16

Keywords

  • Lagrange multipliers
  • Multilevel inverter
  • harmonics
  • optimization
  • pulse width modulation (PWM)
  • total harmonic distortion (THD)

ASJC Scopus subject areas

  • Computer Science Applications
  • Hardware and Architecture
  • Artificial Intelligence
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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