Modeling and Simulation of Electromagnetic Immunity of Micro-controller in Power System

To implement the standardized modeling of electromagnetic compatibility for integrated circuits used in power system protective relayings, an improved conduction immunity model of testing method for direct power injection of 16-bit micro-controller under radio frequency interference is proposed. Based on the existing model of the same micro-controller, dynamic and nonlinear factors that reflect the internal impedance variation of micro-controller with the frequency variation of external interference are added into the port module of the improved model; the core network, phase-locked-loop and A/D network model are added into the passive power distribution network (PDN) of the improved model to make the PDN model reflecting the electric energy distribution inside the micro-controller more accurately. The comparison of the measured results with simulation results proved that the upper frequency of the improved model can reach up to 1.4 GHz and the simulation uncertainty is ±1.8 dB while ±2 dB is acceptable. The proposed improved model possesses wider applicable frequency range and lower simulation uncertainty than the state-of-the-art similar models for this kind of micro-cotroller.