Renewable energy is the most desirable energy source, free from the impact of energy shortages, but also by natural conditions, such as the need for hydraulic, wind, solar energy resources, and the most important investment and maintenance costs are high, low efficiency, so the high cost of electricity. Now many scientists are actively looking for new technologies and methods to improve the use of renewable energy efficiency. With the shortage of earth resources, renewable energy will play an increasingly important role.
In a wind farm, individual turbines are interconnected with a medium voltage (usually 34.5 kV) power collection system and communications network. 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.