The Conservation Voltage Reduction (CVR) is a technique that aims to achieve the decrease of\npower consumption as a result of voltage reduction. The customer is supplied with the lowest\npossible voltage level compatible with the stipulated level by the regulatory agency. International\nStandards ANSI C84.1-2006 and IEEE std 1250-1995 specify the range of supply voltage to electronics\nequipment from 0.9 to 1.05 pu of nominal voltage. To analyse the CVR effect in distribution\nsystems with different load characteristics (residential, commercial, industrial or a combination\nof these), mathematical load models are used. Typically, these equipment/load models are used to\nanalyse load aggregation without any consideration of its nonlinearity characteristics. Aiming to\nanalyse the nonlinear characteristics and its consequences, this paper presents a discussion of the\nneglected variables as well as the results of a set of measurements of nonlinear loads. Different\nmathematical models are applied to obtain them for each load. Using these models the load aggregation\nis evaluated. It is presented that although the models show adequate results for individual\nloads, the same does not occur for aggregated models if the harmonic contribution is not\nconsidered. Consequently, to apply the load model in CVR it is necessary to consider the harmonics\npresence and the model has to be done using only the fundamental frequency data. The discussion\nabout the causes is done and the models are compared with the measurements.
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