Static load characteristics consideration for determination of transmission line power capacity

Abstract

The paper refers to the development of computer model, which allows to iteratively calculate the maximum power capacity of the three-phase overhead or cable power line. The model considers two factors, which coexistence is known for complicating estimations of the power, consumed by the load, namely: impedance of the grid voltage source and static load characteristics (VI or VAR curves). The modelling of the load as current source, which current is a function of the voltage magnitude at the power line output, allowed to consider static (V-I) characteristics of the load. The model was implemented in the Simulink environment, which iterative nature of calculations allows to converge the grid output and load input voltages and currents after the transient, and therefore to consider parameters of the steady-state operation as sought-for solution.