Alstom put into service its innovative Hesop reversible substation for the Yellow Line of Milan Metro, being the first Hesop 1,500V 4MW. By implementing this solution, ATM, Milan’s metro operator, will recover 15% of the traction energy generated when trains brake, and then to re-inject that energy into the public power grid, on Yellow Line.
In addition, this will help make ATM to control tunnel temperatures. This is the second Hesop in commercial operation on a metro line. The first was the Hesop 600V 1MW installed for the London Underground, in operation since March 2015.
“We bring our innovative technology with the introduction of Hesop in the Rogoredo sub-station of Yellow Line of Milan subway. We would like to thank ATM that played a key role by supporting the Alstom team throughout the duration of the installation and testing phase . This is just the latest sign that we at Alstom are determined to become more and more active across rail infrastructure in Italy,” said Michele Viale, Managing Director of Alstom in Italy and Switzerland.
The project was developed jointly by Alstom’s site in Rome, Italy Charleroi, Belgium and Saint-Ouen, France for ATM. ATM played a key role in the project by making proofing environment available and by sharing the installation solutions in the project phase. This project is funded by the LIFE+ program of the European Commission.
The Hesop system works by converting and transferring any unused power, generated by the trains during braking, to accelerating trains elsewhere on the line or to the grid. The Hesop control system is highly intelligent and ensures that the energy is recovered via the most efficient route that the infrastructure will permit. It enables the recovery of more than 99% of the traction energy generated during braking, thereby reducing CO2 emissions through reduced energy consumption.
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