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Document Number CLNR-L217

Date Posted 23-Feb 2015

After Diversity Maximum Demand (ADMD) Report


After diversity maximum demand (ADMD) is used in the design of electricity distribution networks where demand is aggregated over a large number of customers. ADMD accounts for the coincident peak load a network is likely to experience over its lifetime and as such is an overestimation of typical demand. The period of consideration used in this study was one whole year for each customer type. Not all customers coincide with the same year but do have the same winter period in which a peak demand is likely to occur. Peak electric vehicle charging is also shown to be seasonally dependent.

Network peak demand, considering diversity between customers is time coincident where within each household there are times, mainly the 4-8pm period, in which electricity is used simultaneously, for example when all appliances are used at the same time. An ADMD is normally 2kW when electric heating isn’t present[1]. Generally it is shown that as the number of customers increases, the maximum time-coincident demand per dwelling falls and the uncertainty decreases.

Initial findings

  • Demands stabilise at 1.5kW for the sample population of domestic customers. Note: no account for sample bias is accounted for in this study.
  • Generally, analytical solutions in the form of a first term power model are good approximations to demand with customer. An exception to this is for vehicle charging and home only demands for electrical vehicle customers.
  • Fluctuations in demand between customer numbers can be attributable to sample variation, larger sampling could limit this.
  • Lower ADMD resulted for all three CLNR demographic income groups at the 100th customer level than with several groups in the mosaic demographics.
  • Solar customers without any intervention (TC5) show the lowest demand of all customers with magnitudes resembling those of Active retirement.
  • Home only demand for EV customers are high demand customers (2kW at the 100th customer)

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