ENGINE & TURBINE TECHNOLOGY
energy-dependability targets. Electrifi cation of energy systems is an important part of the move towards achieving net-zero.
OFFSHORE HVDC CHALLENGES Off shore wind farms in the North Sea are being built further from the shore (100-150 km) and long-distance transportation of wind turbine- generated power is a challenge. When a wind farm is within 80km of the shore, electricity may be transported in alternating current (AC)
type. However, for wind farms located more than 80 km from the shore, additional equipment is required to avoid considerable power losses during transmission. An off shore HVDC converter
station, a high-voltage cable system, and an onshore HVAC converter station are among the additional pieces of equipment required. Off shore HVDC converter stations
convert the AC power provided by wind turbines into DC electricity. DC power has fewer transmission losses than AC electricity, making it more eff icient for long-distance transmission. When the power reaches the onshore HVDC converter plant, it is converted back to AC and sent into the grid. The size of a converter station
is determined by the number of wind turbines linked to it for power conversion and stations can vary in size from 520 MW to 2GW. Heat is
IQ3 Pro for isolation and regulating duty
produced as a byproduct of electricity conversion and the heat-emitting equipment, known as thyristors/ rectifi ers, must be constantly cooled to keep the system working. The most eff ective method for
cooling large HVDC converter stations is to utilise deionised water in a closed system. The deionised water is cooled using saltwater pushed through a heat exchanger that absorbs heat from the deionised water. Some systems blend chemicals like glycol to keep the water from freezing. Off shore wind energy will play a
critical role in developing a sustainable The benefi ts of electric actuation
The fl ow regulation of cooling fl uids is important to a platforms’ normal operation. Any technical issues with managing parameters such as ambient temperature, humidity, and pressure might lead the wind farm to fail. The Rotork IQ3 Pro intelligent electric valve actuators are suitable
for this safety-critical application since their reliability and intelligent features help prevent unplanned downtime. They also require an electric power supply, avoiding the need for equipment that might add weight and complexity to the platform. Rotork CVA electric actuators are for applications requiring constant modulation. They can provide continuous, repeatable modulating control and a programmed fail-to-position option. The IQ3 Pro and CVA actuators have advanced, user-friendly
By 2050 renewables will generate 70% of the overall power mix
programming and commissioning technologies as well as comprehensive data logging, diagnostic, and asset management capabilities, according to the company. Rugged, double-sealed IP66/68 enclosures improve long-term durability in even the toughest situations, such as those found off shore. This protection eliminates the need for a heater, even at temperatures as low as -500C.
and renewable power-generating model. As off shore wind generation extends further from shore, converter platforms and large cable networks are required to reduce transmission losses before the electricity reaches the onshore power system. These converter platforms convert low- voltage energy generated by turbines into high-voltage electricity needed for transmission, providing eff icient power delivery over great distances. ●
For more information visit
https://www.rotork.com/en
www.engineerlive.com
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