http://www.skytron-energy.com/en/news/item/datum/2013/11/06/skytron-energy-sichert-115-mwp-pv-einspeisung-ins-rumaenische-netz-ueber-energie-dispatcher/
The skycontrol power plant controller provides closed-loop active and reactive power control and meet the special requirements of the Romanian grid system. The requirement for power feed direct by local dispatchers and the need for frequency support by providing balancing power, are now mandatory in Romania
For balancing power, the controller adapts the active power feed into the grid in response not only to changes in the grid frequency, but also with respect to the photovoltaic power plant can generate at that instant. This requieres calculating the available PV power on the basis of the plant status information provided by skytron's real-time condition monitoring system. This frequency stabilization function is unique in that it has been implemented without the need for expensive energy storage facilities. This is a first for photovoltaic power generation.
