Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
This report deals with the load duration curves used for development studies on the sub-transmission grid.
The aims of grid development studies are firstly to locate the needs for grid reinforcement, then to elaborate a reinforcement strategy and finally to promote the profitability of this reinforcement. This study is about the last step of grid development studies: benefits calculation.
The profitability of grid development studies is estimated by comparing grid investment costs and failure costs modelled by the energy not supplied.
Load duration curves are used to calculate the energy not supplied due to transmission limitations and therefore to promote the profitability of grid developments (new transmission facilities…). Current load duration curves come from a catalogue created in the early nineties which identifies nine consumption profiles.
The aim of this study was to decide whether this catalogue is still valid or not, and, if this catalogue is no longer valid, to elaborate a new catalogue or a homemade software to create on demand, i.e. “à la carte”, load duration curves or load curves for every studied area.
Firstly, current catalogue relevance has been analyzed through comparisons with real measured load duration curves of fourteen areas which showed its inadequacy. Then, the study of the real measured load duration curves proved that an accurate catalogue including all the existing load profiles would require a huge number of parameters to describe it. Therefore, a new simple catalogue could be enough to model load profiles on large areas for large scale studies but not for local studies. For these last ones, on demand load duration curves would be preferred to have an appropriate detailed and realistic description of local load behaviour.
Finally, a simple method and software to create load duration curves or load curves for every studied area has been developed. Through this analysis, questions were raised of which some could not be answered and this method is not applicable right now. The study needs to be widened in order to establish the links with load levels forecast.
2010. , 48 p.