Matlab Analysis And Simulation Of Ferroresonance

Ferroresonance over voltage is a kind of inner over voltage that always occurs in neutral ungrounded system and sometimes in neutral grounded system. The over voltage and over current of ferroresonance do great harm to stable and safe running of power system. To keep the transmission and distribution equipments out of damage, it is very important to research the ferroresonance simulation model and detection method.Aim at 10 kV power substations, considering the symmetry of the power distribution system, the Matlab simulation program is used to research the ferroresonance simulation model, and the ferroresonance situation on this substation 10kV PT is simulated. The simulation results indicate that the moment of the single phase grounding fault disappearing is a key factor to excite ferroresonance.According to the paper, the digital calculation and simulation will be regarded as the first way to research unlinear ferroresonance. A saturable transformer model in the Simupower System box can be replaced completely the potential transformer that will be needed in the simulation model. Any parameter can be modified to simulate the actual system. Matlab is the most simulation software to simulating unlinear system and the simulating result can be identical with the actual. And the relatively positive analyses and estimation can be done.Additionally, another model had been built to explore the way to restrain ferroresonance by installing capacitors against the ground.