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Eolic Sepec
System designed to Adapt Wind turbines (Irrespective of their Technology) to cope with voltage sags inorder to guarantee continuous operation.
The problem

Some wind turbine technologies connected to electricity networks respond to voltage sags or interruptions in the network by shutting down automatically in the case of a drop in voltage. When the increase in the wind power generated in an area exceeds a value with regard to the power from other forms of generation, these wind turbines are required to continue generating during voltage sags, following the time/depth pattern represented in the following figure for values established by the electricity company in each case.

Typical behaviour of the network during short-circuits
Admissible voltage-time curve at the network connection point
Operation of the EOLIC SEPEC

The EOLIC SEPEC is interconnected between the generator and the network. In normal network regime it behaves like a closed switch. During the failure, it behaves as follows: 1- With regard to the wind turbine, voltage is supplied as if it came from the network and the wind turbine is kept in normal operation. 2- With regard to the network, an active and reactive pattern is generated in accordance with the needs of the network. 3- During the failure, excess power is dissipated internally by EOLIC SEPEC Optionally, SET Q can be equipped to adapt reactive power both during the gap and in permanent regime.

Table comparing sags adaptation systems
*Spanish standard
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