Nonlinear dynamic analysis and ZnO-based suppression of ferroresonance overvoltage in distribution network

Ferroresonance overvoltage that is caused by saturation in electromagnetic type voltage transformers occurs frequently. In order to avoid interference from ferroresonance overvoltage in the safe operation of a power system, it is a to study a reliable and stable resonance elimination measure. Firstly, different types of ferromagnetic resonances are obtained with the different ratio of capacitive reactance and inductive reactance. Thereafter, nonlinear dynamics research method is used to analysis the effect of inhibiting ferroresonance in ZnO nonlinear resistance grounding mode. Finally, the method is verified by ATP-EMTP. The results show that the voltage amplitude of the neutral point through nonlinear resistance falls under normal circumstances and chaotic phenomena is eliminated. The results imply that the suppression measure can well inhibit ferroresonance overvoltage.