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%.
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 language | English |
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Pages (from-to) | 1247-1256 |
Number of pages | 10 |
Journal | IEEE Transactions on Power Delivery |
Volume | 33 |
Issue number | 3 |
Early online date | 11 Oct 2017 |
DOIs | |
Publication status | Published - Jun 2018 |
Bibliographical note
This work was supported by EPSRC UK grant no. EP/K006428/1.ACKNOWLEDGEMENT
The authors would like to acknowledge significant input from Aberdeen University HVDC lab technicians: A. Styles and R. Osborne, in building this converter.
Keywords
- DC/DC converter
- HVDC transmission
- insulated-gate bipolar transistor (IGBT)
- DC fault isolation
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Dragan Jovcic
- Engineering, Aberdeen HVDC Research Centre
- Centre for Energy Transition
- Engineering, Engineering - Chair in Engineering
Person: Academic
Impacts
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Development of DC transmission grids using DC-DC converters
Dragan Jovcic (Coordinator)
Impact: Other Impacts