Laboratory Demonstration of Closed Loop 30kW, 200V/900V IGBT-based LCL DC/DC Converter

Seyed Mahdi Fazeli, Dragan Jovcic, Masood Hajian Foroushani

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3 Citations (Scopus)
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Abstract

The inductor-capacitor-inductor (LCL) DC/DC converter has been extensively studied for high power and stepping ratio because of elimination of internal transformer, lower footprint/weight, higher efficiency, and most importantly
providing DC fault isolation from both DC sides. This paper presents a two-channel, two-layer controller including two inner current loops, which is symmetrical for each bridge of LCL DC/DC. The real-time implementation of control scheme and its performance in normal conditions and during transient DC faults at both sides are studied on a 30kW 200V/900V 1.7 kHz prototype. The prototype development is presented in some depth. The experimental results show that the converter with closed loop control operates well at full power and under fast power reversal. Further DC fault testing concludes that there is no need for blocking since the internal voltage and current variables are within the rated values. Detailed study of converter losses is performed and results show that full power efficiency is around 93.4%.
Original languageEnglish
Pages (from-to)1247-1256
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume33
Issue number3
Early online date11 Oct 2017
DOIs
Publication statusPublished - Jun 2018

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Keywords

  • DC/DC converter
  • HVDC transmission
  • insulated-gate bipolar transistor (IGBT)
  • DC fault isolation

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