Subsea Variable-Speed Drive

It uses the field proven Siemens Perfect Harmony multi-cell topology with bypass capability, which provides high levels of redundancy and reliability. This drive is able to provide efficient and reliable control to different motor types, like induction motors and permanent magnet motors.

Siemens Energy subsea VSD design is flexible and can be adapted to different applications. Stand-alone applications without other typical units from a subsea power grid is also possible. The multi-cell topology can be fully utilized if scaling is required, or even if multiple loads shall be supplied by the same unit.

The subsea VSD is a fluid-filled and pressure-compensated unit. Its natural-convection cooling reduces maintenance requirements and provides excellent reliability. The different components of the subsea VSD have been tested for pressure and fluid compatibility in an extensive qualification program. In addition, the design was verified using a prototype throughout extensive tests in factory and in shallow water conditions, performed in Norway.

The subsea VSD has also an integrated condition and monitoring system that is seamlessly integrated in the Siemens Energy subsea power control system and can easily be integrated with third party systems. This provides the operator with excellent transparency into the equipment and the status of its integrity, enabling optimization operation for enhanced performance and safety.