Impact of HWC DSM on volt age conditions and the choice of load parameters for feeder design
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An extensive load research program, known as the NRS Load Research Project, was conducted between 1994 and 2005 in South Africa. It produced a large volume of domestic customer load data based on a 5-minute sampling period. From this data source statistically-based load models were derived, and are used in a probabilistic design procedure for the sizing of LV feeders. The statistical description used is a Beta probability density function. While this approach has received nation-wide approval in South Africa, it does not include the effects of peak-load reduction through the use of hot-water cylinder (HWC) switching.
In this paper we investigate the impact of HWC DSM on the voltage performance of a LV feeder and the how it affects the choice of load parameters for design. It describes a procedure for using load data for a community with HWC, but without DSM, and then predicts the effect it would have on the characteristic loads once the HWCs are restored, subsequent to load-levelling.