| When ferroresonance happens at zero-load bus bar on neutral-groundedsubstations.It can result in over-voltage and over-current. This would seriously affectthe system safe operation. This article aims at the ferroresonance problem in theneutral-grounded system. Through building mathematical models, the partitionlinearization method is adopted to show the nonlinear inductance flux-current relates,Throngh calculating the System parameter, the digital simulation models are builded.Through analysis comparing, Atp-EMTP and Simulink simulation software areSelected, Using the Type98 nonlinear inductance model parallel resistance inAtp-EMTP simulates PT and using the saturated transformer model in Simulinksubstitutes PT, the simulation testify the feasibility of this two schemes, and thencarries on FFT analysis to the obtained profile which according to the simulation,Finally carries on studies of the erasing resonance of resistance, of resistance paralleledwith capacitor and of shock damper composed of quick saturating reactor andresistance, Obtains the design principle for all kinds of resonance elimination scheme.
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