An energy management system prototype that has the potential to replace overhead electricity lines for trams has been built at CSIRO’s Lindfield site in Sydney.
This first full‐sized prototype unit is a result of a Rail Manufacturing Cooperative Research Centre (CRC) project involving CSIRO and the China Railway Rolling Stock Corporation (CRRC) which is looking into the use of supercapacitors to power light rail tram vehicles.
Traditional trams are powered by overhead electricity lines, which is referred to as a catenary system. A catenary‐free rail system uses an on‐board energy storage system to power rail, which requires high enough energy density to travel between tram stations and high enough power density, in the order of several megawatts, to enable rapid charging and then acceleration of the vehicle from the tram stop.
The prototype unit has been transported to China with the CRRC project team now working to manufacture the design. On a working tram, it is expected that each vehicle will require numerous energy management system units.
CSIRO’s Electrical Machines Team Leader Dr Howard Lovatt said going catenary‐free has many benefits for the rail industry.
“Eliminating the need for overhead electricity lines allows greater design flexibility thanks to fewer limitations on tram headroom and vehicle heights. It also means a reduction in construction and maintenance costs and the ability to store energy from regenerative braking back into the supercapacitor, which can further be used to power the tram,” said Lovatt.
CSIRO has partnered with CRRC on a suite of supercapacitor projects being overseen by the Rail Manufacturing CRC, an Australian Government Business Cooperative Research Centres Programme initiative that connects industry with Australian research institutions.
Initial project deliverables focus on developing the system architecture for cell balancing, charge and discharge profiles, and communications between the onboard system and the platform using commercially‐available supercapacitors, which, unlike batteries, have the ability to charge and discharge very quickly for potentially 100,000 cycles.