Numerical and experimental simulation researches on effectiveness of anti-ferroresonance measures in distribution power grid

This paper focuses on the effectiveness of anti-ferroresonance measures in distribution power grid. In order to simulate the reliability of commonly used anti-ferroresonance measures, a 10kV ferroresonance testing system was set up, and a series of experiments reproducing the ferroresonance initiated by single phase grounding fault or disconnection fault (usually accompanied by grounding) and so on were carried out. Correspondingly, several PSCAD simulation cases were established on the basis of PT models with non-linear magnetic excitation characteristic. These simulation researches discover the anti-ferroresonance performances of the primary resonance eliminator and arc suppression coil with different power system parameters, initiation mode and conditions. The simulation and verification testing are combined to evaluate the anti-ferroresonance ability of certain distribution power grid, and provide guidelines for effective protection from ferroresonance. The effectiveness of compound anti-ferroresonance strategy, which may enhance the abilitiy in suppressing the ferroresonance of the power system, is also discussed.