Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters

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Abstract

This paper presents a midpoint voltage balancer (MVB) which provides neutral point voltage stabilization to three-phase four-wire converters. The MVB consists of dual switching legs, two neutral inductors, and two split capacitors. A sensorless approach with open-loop control is adopted. It removes current/voltage sensors and alleviates computational demand. It is a cost effective and robust alternative to the closed-loop MVB. Due to the zero-crossing of the neutral inductor current, all switches of the MVB operates in zero-voltage switching mode when neutral current is smaller than the nominal phase current of the three-phase four-wire converter. Interleaving operation of the MVB minimizes the high-frequency current circulation in the split capacitors. In addition, the two neutral inductors are magnetically coupled to decrease the inductor current ripple. As a result, the size of passive components of the MVB is reduced. The proposed sensorless approach is verified by a 20 kVA prototype.
Original languageEnglish
Title of host publication22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
PublisherInstitute of Electrical and Electronics Engineers
Number of pages10
ISBN (Electronic)978-9-0758-1536-8
DOIs
Publication statusPublished - Sep 2020
Event22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe - https://epe-ecce-conferences.com/epe2020/, Lyon, France
Duration: 7 Sep 202011 Sep 2020
https://epe-ecce-conferences.com/epe2020

Conference

Conference22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
Abbreviated titleEPE'20 ECCE Europe
Country/TerritoryFrance
CityLyon
Period7/09/2011/09/20
Internet address

Keywords

  • Converter circuit
  • Interleaved converters
  • Midpoint voltage balancer
  • Sensorless control
  • Three-phase system

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