Phase Coordinates Method: Equivalent Load Model

The equivalent load in phase coordinates is given by a constant active and reactive power. Based on the magnitude of the load power and voltage, a direct transfer matrix is calculated.

In fig. 1 is an equivalent constant load equivalent circuit. Resistance is determined only in a direct sequence and depends on the total load power.

phcoor7_1Fig. 1. Equivalent load equivalent circuit

In phase coordinates, the equivalent load is described by the direct transfer matrix


where phcoor6_f4, phcoor6_f5, phcoor6_f3, phcoor7_f1U – equivalent load voltage, S = P + jQ – equivalent load power.

The attached file shows the calculation of the equivalent load form A matrix in Matlab: A_load.m

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