7 Renewable generation intermittency - IEA Task 14

The International Energy Agency (IEA) established Task 14 to focus on electricity grid configurations with a high penetration of Renewable Energy Sources (RES), where PV constitutes the main RES. No common definition of ‘high penetration PV scenarios’ has been established, but there is common consensus within the Task Definition group that high penetration situation exists if additional efforts will be needed to integrate the dispersed generators optimally. A new definition, suggested by the authors, states that a high penetration intermittent generation scenario exists where it is the variability of the intermittent generation rather than the loads within a network segment that is the dominant factor in determining the need for substation/network or control upgrades. Task 14 aims to analyse particular issues related to the penetration of PV in electricity grids and to establish penetration scenarios in order to guide discussions on respective technical challenges. The program is addressing mainly technical issues relating to high penetration of PV in electricity networks. These include energy management, grid interaction, and aspects to do with local distribution grids and central PV generation scenarios. One characteristic of PV considered in the Task 14 work is the variable and fluctuating nature of generation associated with PV.

This section summarises key intermittency issues presented and discussed at the IEA Task 14 High Penetration Photovoltaic workshops held in December 2010 at Colorado, USA, and more recently in May 2011 at Lisbon, Portugal. The Task 14 Work Group is made up of representatives from many countries including Japan, China, Austria, Germany, Spain, Portugal, the USA and Australia.