Unique Steady State Elimination Method Used in Ferroresonance

There often exists certain disparity between the experimental data and the conclusion while using experimental study,numerical simulation and theory analysis to deal with ferroresonance problems.Therefore,a new method for eliminating resonance in nonlinear system,the unique steady state elimination method,is presented.Its basic idea is that if there is a normal(non-resonance) solution for the system,and the steady state of system is unique,then the corresponding conditions are the conditions for eliminating resonance.The method is applied to analyze the eliminating of ferroresonance in neutral grounding power system.Based upon estimation of unit matrix,the conditions for eliminating this ferroresonance can be obtained.The conclusions of this paper are proved correct by numerical simulation,and it shows the effectiveness of unique steady state elimination method.