Abstract
Polynomial load model practical application has some specificity. Per unit static load model dependence on node rated voltage value is demonstrated in this paper. The assigned rated voltage values of load nodes with polynomial characteristics are to be invariant to avoid calculation complementary error appearance. If rated voltage correction is necessary condition, for example to obtain calculation convergence, the active and reactive power drawn under rated voltage and polynomial coefficients must be corrected too. Correcting calculation expressions are presented in the paper.
Highlights
Load modeling is necessary for power system management
Series of steady state mode calculation were made with different load node voltage values, and active and reactive power values were noted
Load models difference is explained by using different base voltage values: UBAS1 6.2 kV for original characteristics and UBAS2 6.0 kV for “RastrWin” software package
Summary
Load modeling is necessary for power system management. Different load model modifications are established [1,2,3], but problems of its practical application are described not so . The basic simulation tool, using by the System Operator of the Russian United Power System, is “RastrWin” software package [4]. Electric loads are presented by per unit polynomial static load models in this package. Active and reactive power are used to convert values to per unit system. Practical calculations of power system mode parameters often demand nodes base voltage changing. In result static load models have difference from original characteristics, and calculation complementary error appears. There is no description of this problem and its solution in literature
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