In the early stage of wind generation introduction into the power systems its contribution was so insignificant that no special requirements were imposed for its integration. Normally, existing voltage and frequency control resources and the reserves available in the power systems are capable of coping with inherently variable characteristics of generation by wind power plants up to 20% of the penetration levels. Nevertheless, with fast growth of wind generation penetration, changes to the systems and the ways of operation are required to accommodate this new source of energy in order not to jeopardize system security, its steady state and transient/dynamic performance.
Impact of wind generation on power systems security should be assessed considering its effect in time and space. As far as the time is concerned, effects are caused by system balancing in the operational timescale (minutes to hours), whereas in the space scale, local and system-wide consequences should be evaluated. A loss of a significant amount of wind power can affect voltage and active power (frequency) control. Thus, it is imperative that wind power plants can support the voltage in the system during the faults. In addition, the wind power plants installed at the end of long radial lines must have an adequate reactive power control to ensure the voltage support in weak grids.
This working group has become part of the WG #3 in 2013 and will focus on establishing requirements to be fulfilled by wind power generation to support power system’s security of supply.