Abstract
DC transmission grids are the promising electrical networks in the near future especially with the high penetration of large-scale renewables. This article proposes a modified version of the dual active bridge (DAB) dc/dc converter with ac link capacitors generating reactive power to compensate for nonactive power consumption, hence mitigating current stresses and losses to improve efficiency. The proposed topology also enables the connectivity of current source line-commutated HVDC and voltage source HVDC technologies particularly during power reversal; a feature which conventional DAB is incapable of doing. Analysis and detailed design of the proposed converter are addressed and a comparative performance analysis is carried out with conventional DAB. Converter principle of operation is explained and MATLAB/Simulink simulations are carried out to verify converter operation particularly under adverse conditions such as rated power reversal and dc fault conditions. A low-scale prototype substantiates the theoretical analysis and simulation results.
| Original language | English |
|---|---|
| Pages (from-to) | 6963-6973 |
| Number of pages | 11 |
| Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 15 Oct 2020 |
Keywords
- DC/DC converter
- dual active bridge (DAB)
- hybrid HVDC grids
- line commutated converter (LCC)
- voltage source converter (VSC)
Documents and Links
- Aboushady, A. et al (2020) Modified dual active bridge DCDC converter with improved efficiency and interoperability in hybrid LCCVSC HVDC transmission grids
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