ABB awarded a second contract for power-from-shore to Statoil's Troll A platform
The energy company
Statoil has awarded ABB a second contract to supply subsea HVDC Light transmission systems to the Troll A platform in the North Sea. This second delivery, Troll a 3 & 4, will provide a total of 100 MW to the platform to power two compressor drive systems. It is scheduled to go in operation in 2015. In 2002, ABB was awarded the world's first offshore transmissions with HVDC Light to the same platform - Troll A 1 & 2. This was successfully completed in 2005.
The projects combines the HVDC Light
® technology and the
ABB VHV Motor (Very High Voltage Motor), which is cable-wound. When the second delivery is completed in 2015, it will consist of a total of four transmissions - two each rated 44 MW and two each rated 50 MW - on the mechanical shaft of the VHV Motor. The inverter stations on the platform are directly connected to the motors thus no transformers are needed.
The rectifiers at Kollsnes (onshore station) connect through standard power transformers to the existing 132 kV network with breakers. From the rectifiers, HVDC Light cables connect the rectifier with the inverter placed on the Troll A platform, a distance of around 70 km. See the single line diagram.
The Troll A gas platform in the North Sea |
The Troll platform module.
|
The AC side of the inverters are connected to the VHV Motors via breakers and AC cables. The VHV Motors' outgoing shafts are directly coupled to gearboxes that deliver the right number of revolutions. The VHV Motors are governed by the HVDC Light
® control system MACH 2
TM.
Compared to conventional systems, HVDC Light saves weight and reduces the space the system takes up on the platform.
| Main data |  |
|---|
| Commissioning year: | 1 & 2: 2005
3 & 4: 2015 |
| Power rating: | 1 & 2: 88 MW
3 & 4: 100 MW |
| No of circuits | 1 & 2: 2
3 & 4: 2 |
| AC Voltage: | 132 kV (Kollsnes)
1 & 2: 56 kV (Troll)
3 & 4: 66 kV (Troll |
| DC Voltage: | ±60 kV |
| Length of DC submarine cables: | 1 & 2: 4 x 70 km
3 & 4: 4 x 70 km |
| Main reason for choosing HVDC Light: | Environment, long submarine cable distance, compactness of converter on platform |
| |
Watch the film
"Power from shore".