Conversion Error of Exponential to Second Order Polynomial ZIP Load Model Conversion

This paper presents two novel analytical methods for exponential to second order polynomial (i.e. ZIP) load model conversion. The load model conversion error of the proposed methods and three known methods is compared based on the results of conducted numerical analysis. The conversion accuracy of the proposed analytical methods was found to be better than the accuracy of previously known analytical conversion method. In some cases, the conversion error of proposed methods was comparable to non-linear least squares conversion results. It is also shown that the load model conversion error depends on the used conversion method, exponential load model parameter values and the voltage used for error calculation.