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

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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
Publication statusPublished - Sept 2020
Event22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe -, Lyon, France
Duration: 7 Sept 202011 Sept 2020


Conference22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
Abbreviated titleEPE'20 ECCE Europe
Internet address


This work has been conducted within HiPERFORM project, which has received funding from the ECSEL Joint Undertaking (JU) under Grant Agreement No. 783174. The JU receives support from the European Union’s Horizon 2020 research and innovation program and Austria, Spain, Belgium, Germany, Slovakia, Italy, Netherlands, Slovenia.

FundersFunder number
European Union 's Horizon 2020 - Research and Innovation Framework Programme783174
Electronic Components and Systems for European Leadership


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


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