Time Variant Voltage and Current Modeling Corresponding to Access Impedance Measurements

The accurate characterization of the output voltage and current of PLC devices with respect to time and frequency variant access impedances on the power line is a prerequisite for successful design of PLC systems. The impedance of the PLC channel is strongly affected by the unmatched loads on the power grid. This problem leads to a reduction of the power amplifier output level of PLC modems and the transmitted signals. The running current at the output of PLC devices increases to its limit if the access impedance goes under a limit value. In this paper, we present a voltage and current modeling method corresponding to time variant access impedance measurements. The access impedances are modeled using resonant circuits. The impulse response of the designed RLC filters is calculated to find the voltage and current model. The time variant behavior is analyzed at specific time slots using a toggle switch with parallel resonant circuits. Simulation results based on IEEE 1901.2 standard are presented to confirm the modeling method.