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- Title
Master-slave DC droop control for paralleling auxiliary DC/DC converters in electric bus applications.
- Authors
Federico, Ibanez; Jose, Echeverria; Luis, Fontan
- Abstract
This study reviews the causes of power losses in a DC/DC converter, relates those losses with efficiency profiles and details different strategies for maximising efficiency when several converters are placed in parallel. The research is focused on electric bus applications, where several converters are usually connected in parallel in order to fulfil the power requirements of the bus models. In a bus, the low-voltage DC link (28 V) resembles a microgrid that has some generators (DC/DC converters), an energy storage system (lead-acid batteries) and certain loads. To share the converter's output power, a droop control is proposed. Furthermore, traditional droop control is improved by adding a master-slave control. The proposed master-slave droop control improves efficiency by more than 3% at low power with no additional hardware. Experimental results show how two 5 kW converters work in parallel using the proposed control.
- Subjects
ELECTRIC vehicle industry; ELECTRIC current converters; DC-to-DC converters; ENERGY storage; TRACTION power supplies
- Publication
IET Power Electronics (Wiley-Blackwell), 2017, Vol 10, Issue 10, p1156
- ISSN
1755-4535
- Publication type
Article
- DOI
10.1049/iet-pel.2016.0590