Characterising the VPP

The use of small-scale generation of disparate technologies is becoming more prevalent due to the imperative to reduce green house gas emissions that are thought to be the chief cause of climate change, as well as the desire to improve system flexibility and security. As penetration of these distributed resources increases, displacing central generation, there is growing need to understand the composite behaviour of groups of Distributed Generation (DG) devices, also known as Virtual Power Plants (VPPs). This paper presents the methodology for the mathematical modelling of the uncertain elements of the VPP. In this paper the VPP is defined from the standpoint of electrical and geographical proximity of DG devices typified, for example, by location in the same distribution area supplied from the one grid supply point.