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

Xinwei Xu; Gabriel Tibola; Jorge L.  Duarte

doi:10.23919/EPE20ECCEEurope43536.2020.9215759

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

Xinwei Xu, Gabriel Tibola, Jorge L. Duarte

Electromechanics and Power Electronics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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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 language	English
Title of host publication	22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
Publisher	Institute of Electrical and Electronics Engineers
Number of pages	10
ISBN (Electronic)	978-9-0758-1536-8
DOIs	https://doi.org/10.23919/EPE20ECCEEurope43536.2020.9215759
Publication status	Published - Sep 2020
Event	22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe - https://epe-ecce-conferences.com/epe2020/, Lyon, France Duration: 7 Sep 2020 → 11 Sep 2020 https://epe-ecce-conferences.com/epe2020

Conference

Conference	22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
Abbreviated title	EPE'20 ECCE Europe
Country/Territory	France
City	Lyon
Period	7/09/20 → 11/09/20
Internet address	https://epe-ecce-conferences.com/epe2020

Keywords

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

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10.23919/EPE20ECCEEurope43536.2020.9215759

Sensorless Neutral Point Voltage StabilizationFinal author version , 2.17 MB

Cite this

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title = "Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters",

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. ",

keywords = "Converter circuit, Interleaved converters, Midpoint voltage balancer, Sensorless control, Three-phase system",

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year = "2020",

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publisher = "Institute of Electrical and Electronics Engineers",

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note = "22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe, EPE'20 ECCE Europe ; Conference date: 07-09-2020 Through 11-09-2020",

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}

Xu, X , Tibola, G & Duarte, JL 2020, Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters. in 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)., 9215759, Institute of Electrical and Electronics Engineers, 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe, Lyon, France, 7/09/20. https://doi.org/10.23919/EPE20ECCEEurope43536.2020.9215759

Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters. / Xu, Xinwei ; Tibola, Gabriel ; Duarte, Jorge L. .

22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe). Institute of Electrical and Electronics Engineers, 2020. 9215759.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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AU - Xu, Xinwei

AU - Tibola, Gabriel

AU - Duarte, Jorge L.

PY - 2020/9

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N2 - 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.

AB - 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.

KW - Converter circuit

KW - Interleaved converters

KW - Midpoint voltage balancer

KW - Sensorless control

KW - Three-phase system

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M3 - Conference contribution

BT - 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

PB - Institute of Electrical and Electronics Engineers

T2 - 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe

Y2 - 7 September 2020 through 11 September 2020

ER -

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

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

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