FEATURE SPONSOR
LIFE EXTENSION OF WINDFARMS
POWER GENERATION USING WIND TURBINES Wind turbines harvest wind energy by converting the kinetic energy in the wind to electrical energy. An alternator in the turbine converts the rotational energy into electrical energy which is passed via a subsea cable to an offshore platform along with cables from other turbines. Here the power passes through a transformer to raise the voltage for transmission via a larger subsea cable to the land where it enters the shore station.
At the shore station the power is conditioned and fed into the national grid network for distributor across the country.
The whole shore station site needs power to run the computers, pumps, lights, SCADA systems, air handling, security systems etc. For this, some of the power is transformed down from 33,000 volts to 400V to power the substation via auxiliary transformers.
AUTOMATIC VOLTAGE REGULATOR
However, clean regulated power is required for the equipment and so an automatic voltage regulator is used to stabilise the voltage and to provide reliable operation of the substations control equipment and ancillary appliances. This is the application for which Sollatek has been commissioned to supply a number of AVRs to sites including; Greater Gabbard, Thanet, London Array, Gwynt y Môr, Dudgeon and Galloper offshore windfarms in the UK.
Typically the substation has two auxiliary 33,000 volts to 400 volts step down transformers connected to two three phase Sollatek AVRs. The AVRs regulate the 400 volt three phase supply to the site’s Low Voltage Alternating Current (LVAC) distribution board from which point all the site equipment is powered.
The new Thyristor controlled Automatic Voltage Regulator is a solid state stabiliser which uses microprocessor technology. The AVR can rapidly detect voltage variations and correct the output. This ensures that no damage can be done.
The system, while costing less than other stabiliser technologies that use mechanical systems. Furthermore, the compact design of their AVRs offer a smaller footprint and the solid state technology gives a longer operational lifetime and little or no need for maintenance.
Sollatek NEED FOR VOLTAGE REGULATORS
Variations in voltage can damage mains connected appliances due to the fluctuations from dangerously highly to frighteningly low inputs. Damage can be caused to equipment resulting in depleted life span, degraded performance, digital errors and failure of hard drives.
Voltage regulators are used to keep voltages within the prescribed range that can be tolerated by the electrical equipment, controlling that power and thus minimising variations in voltage in order to protect equipment using the electricity.
BEST SOLUTION
The company’s Voltright range is the best solution to stabilise and regulate mains supply where the voltage is erratic or unreliable and can protect all domestic, commercial and industrial appliances.
www.windenergynetwork.co.uk
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