Railway power grids need to be operated independently from the public power grid.
Railway power supplies are single phase systems. Progressively the public three phase AC network is being interconnected to the railway grid via static frequency converters (SFCs). Hitachi ABB Power Grids is pioneer and world market leader in providing these railway interconnections.
Compared to the previous solution of rotating converters the SFC provides following benefits:
- Lower investments
- Higher efficiency
- Fast start-up times and immediate response to grid faults
- Lower maintenance costs
- Improved movability / scalability