<P> In a wind farm, individual turbines are interconnected with a medium voltage (often 34.5 kV), power collection system and communications network . In general, a distance of 7D (7 × Rotor Diameter of the Wind Turbine) is set between each turbine in a fully developed wind farm . At a substation, this medium - voltage electric current is increased in voltage with a transformer for connection to the high voltage electric power transmission system . </P> <P> Induction generators, which were often used for wind power projects in the 1980s and 1990s, require reactive power for excitation so substations used in wind - power collection systems include substantial capacitor banks for power factor correction . Different types of wind turbine generators behave differently during transmission grid disturbances, so extensive modelling of the dynamic electromechanical characteristics of a new wind farm is required by transmission system operators to ensure predictable stable behaviour during system faults . In particular, induction generators cannot support the system voltage during faults, unlike steam or hydro turbine - driven synchronous generators . </P> <P> Today these generators aren't used any more in modern turbines . Instead today most turbines use variable speed generators combined with partial - or full - scale power converter between the turbine generator and the collector system, which generally have more desirable properties for grid interconnection and have Low voltage ride through - capabilities . Modern concepts use either doubly fed machines with partial - scale converters or squirrel - cage induction generators or synchronous generators (both permanently and electrically excited) with full scale converters . </P> <P> Transmission systems operators will supply a wind farm developer with a grid code to specify the requirements for interconnection to the transmission grid . This will include power factor, constancy of frequency and dynamic behaviour of the wind farm turbines during a system fault . </P>

How many volts does a wind-powered power station produce each day